CN103390906B - The control device of wind generator system access direct-current grid and method - Google Patents
The control device of wind generator system access direct-current grid and method Download PDFInfo
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Abstract
The control device of the present invention's open wind generator system access direct-current grid and method.This device, according to the pattern variable order received from energy manager, makes wind generator system be in different mode of operations, comprises MPPT maximum power point tracking pattern, constant voltage mode and invariable power pattern.Corresponding control algolithm is run under different working modes, thus, make wind generator system can adjust according to the energy requirement of direct-current grid the energy being input to direct-current grid, like this, make wind generator system controlled, contribute to the stable operation realizing whole direct-current grid; In addition, owing to considering power output, the power difference and voltage difference etc. of wind generator system during control algorithm design, so control precision is high, reliability is also high, and capacity usage ratio is also high.
Description
Technical field
The present invention relates to wind generator system, particularly relate to control device and the control method thereof of wind generator system access direct-current grid.
Background technology
In recent years, under the dual-pressure of energy scarcity and environmental pollution, wind power grid-connected generating system application is more and more.But, simply a large amount of wind power grid-connected generating systems is directly linked into and exchanges in bulk power grid, will the network topology of original system be changed, thus affect the distribution of trend, bring uncertainty to the stability of electrical network, and have impact on the quality of power supply.Therefore, when wind generator system generates electricity by way of merging two or more grid systems, there is certain obstacle.
Exchanging for improving the ability that bulk power grid receives renewable energy power generation, exchanging micro-capacitance sensor and being suggested for connecting wind power generation distributed electricity generation system and exchanging bulk power grid.But on the one hand, the electric energy sent from wind-force will through multi-stage power conversion ability incoming transport micro-capacitance sensor, incoming transport micro-capacitance sensor after wind-force adopts AC/DC/AC to convert usually; And the control that will realize when incoming transport micro-capacitance sensor in grid-connected current amplitude, phase place, sine degree and harmonic wave etc., controls complicated simultaneously; In addition on the one hand, when electricity consumption, directly use the situation of alternating current fewer and feweri without conversion, DC load generally adopts the structure of AC/DC/DC, and AC load generally adopts the structure of AC/DC/AC.Multi-stage transformation brings the decline, reliability reduction etc. of many negative consequences, such as efficiency of energy utilization.In order to overcome these problems, propose to adopt direct-current grid to replace exchanging micro-capacitance sensor in some occasion.
For ensureing the stable operation of direct-current grid, need to keep DC bus-bar voltage within the specific limits.Therefore direct-current grid has plurality of operating modes usually, when wind generator system is accessed direct-current grid, need the operational mode residing for direct-current grid, take different control methods, to make the controlled stable operation with contributing to realizing whole direct-current grid of wind generator system.
Summary of the invention
The problem that the present invention solves makes the controlled problem with contributing to realizing whole direct-current grid stable operation of wind generator system.
For solving the problem, the invention provides the control device of a kind of wind generator system access micro-capacitance sensor, described wind generator system is connected to micro-capacitance sensor by switching circuit, this device comprises current sampling circuit, the first voltage sampling circuit, the second voltage sampling circuit, processor and drive circuit, wherein, described current sampling circuit and the first voltage sampling circuit sample respectively wind generator system export electric current and voltage, the voltage of described second voltage sampling circuit sampling DC bus, described processor receives the pattern variable order from energy manager, and the different value of this pattern variable order is corresponding with MPPT maximum power point tracking pattern, constant voltage mode or invariable power pattern respectively, when pattern variable order corresponds to MPPT maximum power point tracking pattern, the electric current of sampling according to current sampling circuit and the first voltage sampling circuit and magnitude of voltage calculate current power, the current voltage gathered according to the first voltage sampling circuit and the number of pole-pairs of generator calculate the generator angular velocity of rotation ω (K) of wind generator system, also calculate the difference e P (K) of current power and last power, the difference DELTA ω (K) of current generator angular velocity of rotation and last angular velocity of rotation and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d < Δ dmax, eP (K) > 0 and Δ ω (K) > 0 or Δ d=Δ dmax, during eP (K) > 0 and Δ ω (K) > 0, control signal last time is added described control signal increment and produces the first control signal, when Δ d < Δ dmax, eP (K) > 0 and Δ ω (K)≤0 or Δ d=Δ dmax, eP (K) > 0 and Δ ω (K)≤0, control signal last time is deducted described control signal increment and produces the second control signal, when Δ d < Δ dmax, eP (K)≤0 and Δ ω (K) > 0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K) > 0, control signal last time is deducted described control signal increment and produces the 3rd control signal, when Δ d < Δ dmax, eP (K)≤0 and Δ ω (K) < 0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K) < 0, control signal last time is added described control signal increment and produces the 4th control signal, described processor is when pattern variable order corresponds to constant voltage mode, the electric current of sampling according to current sampling circuit and the first voltage sampling circuit and voltage calculate the difference e P (K) of current power and current power and last power, according to the DC bus-bar voltage calculated difference eV (K) that desired voltage values and the second voltage sampling circuit are sampled, adopt PI to control to eV (K) and calculate wind generator system control signal increment Delta d=Kp × (eV (K)-eV (K-1))+Ki × eV (K) to the time of micro-capacitance sensor input electric energy, when eP (K) > 0, the control signal of last time is added described control signal increment and produces the 5th control signal, when eP (K)≤0, eV (K)≤ε or eV (K-1)≤ε, the control signal of last time is added described control signal increment exports as the 6th control signal, at eP (K)≤0, and eV (K) > ε and eV (K-1) > ε, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction, described processor corresponds to invariable power pattern in pattern variable order: the electric current of sampling according to current sampling circuit and the first voltage sampling circuit and voltage calculate current power P (K) and expects the difference e P (K) of power and current power, adopt PI to control to eP (K) and calculate wind generator system control signal increment Delta d=Kp × (eP (K)-eP (K-1))+Ki × eP (K) to the time of micro-capacitance sensor input electric energy, when P (K)-P (K-1) > 0, the control signal of last time is added described control signal increment exports as the 7th control signal, when P (K)-P (K-1)≤0, eP (K)≤ε or eP (K-1)≤ε, the control signal of last time is added described control signal increment exports as the 8th control signal, at P (K)-P (K-1)≤0, and during eP (K) > ε and eP (K-1) > ε, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction, described drive circuit amplification carrys out first of self processor and controls signal to the 8th control signal, and the signal after respective transmissions amplification controls signal to the make-and-break time of the described switching circuit of the corresponding control of the 8th control signal by described first to switching circuit.
In concrete scheme, described first to control signal to the 8th control signal be pwm signal respectively, and span is between 0 to 1.
In concrete scheme, in MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05; In constant voltage mode, the span of described threshold value ε is between the 2%-5% of DC bus-bar voltage desired voltage values; The span of Kp is at 0.04/V
refto 1/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage; In invariable power pattern, the span of described threshold value is that between the 2%-5% of expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, wherein P
reffor expecting power output; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, wherein P
reffor expecting power output.
The present invention also discloses the control device of another kind of wind generator system access micro-capacitance sensor, described wind generator system is connected to the DC bus of micro-capacitance sensor by switching circuit, this device comprises current sampling circuit, the first voltage sampling circuit, the second voltage sampling circuit, processor and drive circuit, wherein, the voltage of described first voltage sampling circuit sampling wind generator system output, described current sampling circuit and the second voltage sampling circuit are sampled respectively and are incorporated to the electric current of DC bus and the voltage of DC bus, described processor receives the pattern variable order from energy manager, and the different value of this pattern variable order is corresponding with MPPT maximum power point tracking pattern, constant voltage mode or invariable power pattern respectively, when pattern variable order corresponds to MPPT maximum power point tracking pattern, the electric current of sampling according to current sampling circuit and the second voltage sampling circuit and magnitude of voltage calculate current power, the current voltage gathered according to the first voltage sampling circuit and the number of pole-pairs of generator calculate the generator angular velocity of rotation ω (K) of wind generator system, also calculate the difference e P (K) of current power and last power, the difference DELTA ω (K) of current generator angular velocity of rotation and last angular velocity of rotation and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d < Δ dmax, eP (K) > 0 and Δ ω (K) > 0 or Δ d=Δ dmax, during eP (K) > 0 and Δ ω (K) > 0, control signal last time is added described control signal increment and produces the first control signal, when Δ d < Δ dmax, eP (K) > 0 and Δ ω (K)≤0 or Δ d=Δ dmax, eP (K) > 0 and Δ ω (K)≤0, control signal last time is deducted described control signal increment and produces the second control signal, when Δ d < Δ dmax, eP (K)≤0 and Δ ω (K) > 0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K) > 0, control signal last time is deducted described control signal increment and produces the 3rd control signal, when Δ d < Δ dmax, eP (K)≤0 and Δ ω (K) < 0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K) < 0, control signal last time is added described control signal increment and produces the 4th control signal, described processor is when pattern variable order corresponds to constant voltage mode, the electric current of sampling according to current sampling circuit and the second voltage sampling circuit and voltage calculate the difference e P (K) of current power and current power and last power, according to the DC bus-bar voltage calculated difference eV (K) that desired voltage values and the second voltage sampling circuit are sampled, adopt PI to control to eV (K) and calculate wind generator system control signal increment Delta d=Kp × (eV (K)-eV (K-1))+Ki × eV (K) to the time of micro-capacitance sensor input electric energy, when eP (K) > 0, the control signal of last time is added described control signal increment and produces the 5th control signal, when eP (K)≤0, eV (K)≤ε or eV (K-1)≤ε, the control signal of last time is added described control signal increment exports as the 6th control signal, at eP (K)≤0, and eV (K) > ε and eV (K-1) > ε, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction, described processor corresponds to invariable power pattern in pattern variable order: the electric current of sampling according to current sampling circuit and the second voltage sampling circuit and voltage calculate current power P (K) and expects the difference e P (K) of power and current power, adopt PI to control to eP (K) and calculate wind generator system control signal increment Delta d=Kp × (eP (K)-eP (K-1))+Ki × eP (K) to the time of micro-capacitance sensor input electric energy, when P (K)-P (K-1) > 0, the control signal of last time is added described control signal increment exports as the 7th control signal, when P (K)-P (K-1)≤0, eP (K)≤ε or eP (K-1)≤ε, the control signal of last time is added described control signal increment exports as the 8th control signal, at P (K)-P (K-1)≤0, and during eP (K) > ε and eP (K-1) > ε, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction, described drive circuit amplification carrys out first of self processor and controls signal to the 8th control signal, and the signal after transmission amplification controls signal to the make-and-break time of the described switching circuit of the corresponding control of the 8th control signal by described first to switching circuit.
In concrete scheme, described first to control signal to the 8th control signal be pwm signal respectively, and span is between 0 to 1.
In concrete scheme, in MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05; In constant voltage mode, the span of described threshold value ε is between the 2%-5% of DC bus-bar voltage desired voltage values; The span of Kp is at 0.04/V
refto 1/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage; In invariable power pattern, the span of described threshold value is that between the 2%-5% of expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, wherein P
reffor expecting power output; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, wherein P
reffor expecting power output.
The present invention also discloses the control method of a kind of wind generator system access micro-capacitance sensor, this wind generator system accesses micro-capacitance sensor by switching circuit, the method comprises the steps: to receive the pattern variable order from energy manager, and the different value of this pattern variable order corresponds respectively to MPPT maximum power point tracking pattern, constant voltage mode or invariable power, when pattern variable order corresponds to MPPT maximum power point tracking pattern, the electric current that sampling wind generator system exports and magnitude of voltage calculate current power, the generator angular velocity of rotation ω (K) of wind generator system is calculated according to the current voltage of collection and the number of pole-pairs of generator, also calculate the difference e P (K) of current power and last power, the difference DELTA ω (K) of current generator angular velocity of rotation and last angular velocity of rotation and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d < Δ dmax and eP (K) > 0 and Δ ω (K) > 0 or Δ d=Δ dmax and eP (K) > 0 and Δ ω (K) > 0 time, control signal last time is added described control signal increment and produces the first control signal, at Δ d < Δ dmax and eP (K) > 0 and Δ ω (K)≤0 or Δ d=Δ dmax and eP (K) > 0 and Δ ω (K)≤0 time, control signal last time is deducted described control signal increment and produces the second control signal, at Δ d < Δ dmax and eP (K)≤0 and Δ ω (K) > 0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K) > 0 time, control signal last time is deducted described control signal increment and produces the 3rd control signal, at Δ d < Δ dmax and eP (K)≤0 and Δ ω (K) < 0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K) < 0 time, control signal last time is added described control signal increment and produces the 4th control signal, when the value of pattern variable order corresponds to constant voltage mode, the voltage of the DC bus of the electric current that sampling wind generator system exports and micro-capacitance sensor, according to the electric current of sampling and the difference e P (K) of voltage calculating current power and current power and last power, according to the DC bus-bar voltage calculated difference eV (K) of desired voltage values and sampling, adopt PI to control to eV (K) and calculate wind generator system control signal increment Delta d=Kp × (eV (K)-eV (K-1))+Ki × eV (K) to the time of micro-capacitance sensor input electric energy, when eP (K) > 0, the control signal of last time is added described control signal increment and produces the 5th control signal, when eP (K)≤0, eV (K)≤ε or eV (K-1)≤ε, the control signal of last time is added described control signal increment exports as the 6th control signal, at eP (K)≤0, and eV (K) > ε and eV (K-1) > ε, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction, invariable power pattern is corresponded to: the voltage of the DC bus of the electric current that sampling wind generator system exports and micro-capacitance sensor in the value of pattern variable order, according to the electric current of sampling and the difference e P (K) of voltage calculating current power P (K) and expectation power and current power, adopt PI to control to eP (K) and calculate wind generator system control signal increment Delta d=Kp × (eP (K)-eP (K-1))+Ki × eP (K) to the time of micro-capacitance sensor input electric energy, when P (K)-P (K-1) > 0, the control signal of last time is added described control signal increment exports as the 7th control signal, at P (K)-P (K-1)≤0 and eP (K)≤ε or eP (K-1)≤ε time, the control signal of last time is added described control signal increment exports as the 8th control signal, at P (K)-P (K-1)≤0 and eP (K) > ε and eP (K-1) > ε time, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction, the conducting that the 8th control signal transfers to described switching circuit and control switch circuit is controlled signal to by above-mentioned first.
In a kind of specific embodiment, described first to control signal to the 8th control signal be pwm signal respectively, and span is between 0 to 1.
In a kind of specific embodiment, in MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05; In constant voltage mode, the span of described threshold value ε is between the 2%-5% of DC bus-bar voltage desired voltage values; The span of Kp is at 0.04/V
refto 1/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage; In invariable power pattern, the span of described threshold value is that between the 2%-5% of expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, wherein P
reffor expecting power output; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, wherein P
reffor expecting power output.
Compared with prior art, the present invention has the following advantages:
Because the control device of wind generator system access direct-current grid of the present invention can correspond to different mode of operations according to the different value of the pattern variable order from energy manager, corresponding control algolithm is run under different working modes, thus, make wind generator system can adjust according to the energy requirement of direct-current grid the energy being input to direct-current grid, (such as, and according to power difference, the mode of voltage difference and so on adjusts and produces corresponding control signal or pattern switching), thus, MPPT maximum power point tracking pattern can be operated in, constant voltage mode or invariable power pattern, like this, the input of direct-current grid is adjusted according to the energy requirement of direct-current grid, make wind generator system controlled, contribute to the stable operation realizing whole direct-current grid, in addition, owing to considering that power output, the power difference and voltage difference and so on of wind generator system realize controlling, so control precision is very high, reliability is also high, and capacity usage ratio is also high.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the first execution mode of control device of wind generator system of the present invention access direct-current grid;
Fig. 2 is the flow chart of the control device of wind generator system of the present invention access direct-current grid when working in MPPT maximum power point tracking pattern;
Fig. 3 is the flow chart of the control device of wind generator system of the present invention access direct-current grid when working in constant voltage mode;
Fig. 4 is the flow chart of the control device of wind generator system of the present invention access direct-current grid when working in invariable power pattern;
Fig. 5 is the theory diagram of control device second execution mode of wind generator system of the present invention access direct-current grid.
Embodiment
By describing technology contents of the present invention, structural feature in detail, reached object and effect, accompanying drawing is coordinated to be described in detail below in conjunction with embodiment.
Refer to Fig. 1, the control device of wind generator system access direct-current grid of the present invention comprises current sampling circuit 1, first voltage sampling circuit 2, second voltage sampling circuit 3, processor 4 and drive circuit 5.Described wind generator system is connected to the DC bus of direct-current grid by switching circuit.In the present embodiment, described switching circuit is made up of uncontrollable rectification circuit and DC/DC converter, also can adopt other modes, if can realize being reached through the make-and-break time that controls this switching circuit and control inputs to the object of the electric energy time of micro-capacitance sensor.Described current sampling circuit 1 and the first voltage sampling circuit 2 sample respectively wind generator system export electric current and voltage, in the present embodiment, be the electric current that the described uncontrollable rectification circuit of sampling exports, the electric current of transmission sampling and magnitude of voltage are to described processor 4.Described second voltage sampling circuit 3 is sampled the voltage of DC bus, and the voltage of transmission sampling is to processor 4.
Please continue to refer to Fig. 1, described processor 4 receives the pattern variable order from energy manager, the different value of this pattern variable order is corresponding with MPPT maximum power point tracking pattern, constant voltage mode or invariable power pattern respectively, such as, the value of the pattern variable order that MPPT maximum power point tracking pattern is corresponding is 1, the value of the pattern variable order that constant voltage mode is corresponding is 2, and the value of the pattern variable order that invariable power pattern is corresponding is 3.How energy manager produces pattern variable order belongs to prior art, does not repeat them here.The pattern variable that energy manager produces can transfer to processor 4 by GPRS network, Ethernet or RS485 communication mode can receive pattern variable order from energy manager to make processor 4.
Refer to Fig. 1 and Fig. 2, this processor 4 is when the value of pattern variable instruction corresponds to MPPT maximum power point tracking pattern, the electric current of processor 4 received current sample circuit 1 sampling and the voltage of the first voltage sampling circuit 2 sampling, the voltage of the electric current of sampling according to current sampling circuit 1 and the sampling of the first voltage sampling circuit 2 calculates current power P (K), according to the generator angular velocity of rotation ω (K) of the voltage calculating wind generator system that the first voltage sampling circuit 2 is sampled, also calculate current power P (K) and the difference e P (K) of last power P (K-1) and the difference DELTA ω (K) of current generator angular velocity of rotation ω (K) and last angular velocity of rotation ω (K-1) and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d < Δ dmax and eP (K) > 0 and Δ ω (K) > 0 or Δ d=Δ dmax and eP (K) > 0 and Δ ω (K) > 0 time, control signal last time is added described control signal increment and produces the first control signal, at Δ d < Δ dmax and eP (K) > 0 and Δ ω (K)≤0 or Δ d=Δ dmax and eP (K) > 0 and Δ ω (K)≤0 time, control signal last time is deducted described control signal increment and produces the second control signal, at Δ d < Δ dmax and eP (K)≤0 and Δ ω (K) > 0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K) > 0 time, control signal last time is deducted described control signal increment and produces the 3rd control signal, at Δ d < Δ dmax and eP (K)≤0 and Δ ω (K) < 0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K) < 0 time, control signal last time is added described control signal increment and produces the 4th control signal.The span of described COEFFICIENT K p is between 0.001 to 0.05, such as, think | eP (K)/Δ ω (K) | < 5 is near maximum power point, the span of Kp is chosen as between 0.0002 to 0.002, make step-length in maximum power point vicinity between 0.001 to 0.01, and amplitude limit is carried out to control signal increment Delta d, maximum is chosen as 0.1, performs climbing method afterwards.Described first to control signal to the 4th control signal be pwm signal respectively, the duty ratio of pwm signal and described control signal linear and reach the object adjusting make-and-break time.In the present embodiment, during Kp < 0.001, the speed of system keeps track maximum power point can be made slow, during Kp > 0.05, concussion near maximum power point is strengthened, all can make the deleterious of MPPT maximum power point tracking.
Please continue to refer to Fig. 1 and Fig. 3, described processor 4 is when the value of pattern variable order corresponds to constant voltage mode, processor 4 received current sample circuit 1 and the first voltage sampling circuit 2 are sampled the electric current and voltage that wind generator system exports, and calculate current power P (K) according to this current value and magnitude of voltage.Also receive the voltage V (K) of the DC bus of the micro-capacitance sensor that the second sample circuit 3 is sampled, calculate the difference e V (K) of the voltage V (K) of the difference e P (K) of current power P (K) and last power P (K-1) and the DC bus of desired voltage values Vref (K) and sampling.Adopt PI to control to eV (K) and calculate wind generator system control signal increment Delta d=Kp × (eV (K)-eV (K-1))+Ki × eV (K) to the time of micro-capacitance sensor input electric energy.When eP (K) > 0, the control signal of last time is added described control signal increment and produces the 5th control signal.At eP (K)≤0 and eV (K)≤ε or eP (K)≤0 and eV (K-1)≤ε time, the control signal of last time is added described control signal increment exports as the 6th control signal.At eP (K)≤0 and eV (K) > ε and eV (K-1) > ε, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction, concrete, pattern variable revision instruction is sent to energy manager, present mode variable is revised as 1 according to this instruction by energy manager, like this, whole control device is just operated in MPPT maximum power point tracking pattern.In the present embodiment, the span of threshold value ε is between 2% ~ 5%, such as, and 3%, 4% etc. of DC bus-bar voltage desired value.In the present embodiment, the span of Kp is at 0.04/V
refto 1/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage, Kp > 1/V
refovershoot can be made to increase, and the stability of a system is deteriorated, Kp > 0.04/V
reftime, system keeps track speed is slow, and control precision is poor; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage, Ki > 0.4/V
refthere will be saturation integral phenomenon, poor system performance, Ki < 0.01/V
refthere is steady-state error in too small telephone system.
Refer to Fig. 1 and Fig. 4, described processor is when the corresponding invariable power pattern of pattern variable order, according to current sampling circuit 1 sample wind generator system export electric current and the first voltage sampling circuit 2 sampling voltage calculate current power P (K), the also difference e P (K) of calculation expectation power and current power, adopt PI to control to eP (K) and calculate wind generator system control signal increment Delta d=Kp × (eP (K)-eP (K-1))+Ki × eP (K) to the time of micro-capacitance sensor input electric energy, when P (K)-P (K-1) > 0, the control signal of last time is added described control signal increment exports as the 7th control signal, at P (K)-P (K-1)≤0 and eP (K)≤threshold value ε or P (K)-P (K-1)≤0 and eP (K-1)≤threshold value ε time, the control signal of last time is added described control signal increment exports as the 8th control signal, at P (K)-P (K-1)≤0 and eP (K) > threshold value ε and eP (K-1) > threshold value ε time, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction, in the present embodiment, described threshold value ε is 2% ~ 5%, such as 3%, 4% of expectation performance number etc.The span of the COEFFICIENT K p that described PID controls is at 0.02/P
refto 0.5/P
refbetween, wherein P
reffor expecting power output, the excessive words of Kp can make overshoot increase, and the stability of a system is deteriorated, and slowly, control precision is poor for too small telephone system tracking velocity; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, wherein P
reffor expecting power output, the excessive words of Ki there will be saturation integral phenomenon, poor system performance, and too small telephone system exists steady-state error.
Please continue to refer to Fig. 1, described first to control signal to the 8th control signal be pwm signal respectively, and span, between 0 to 1, if be greater than 1, then, can adopt amplitude limiting processing and make amplitude in above-mentioned scope.The duty ratio of this pwm signal and the ON time of DC/DC converter linear, like this, the object controlling ON time can be reached by controlling duty ratio, because, between blower fan power output and wind wheel angular speed in relation curve, have the problem of an efficiency in electrical power and mechanical output, simply dealt words also can think that both are equal.Under a wind speed determined, there is a best wind wheel angular speed, for directly-driven wind machine, because wind wheel is coaxially directly connected with wind-driven generator, non-gear box, so speed is also the angular velocity of rotation of wind-driven generator.By the duty ratio of control DC/DC converter, regulate the output current of wind-driven generator, reach the object changing wind-driven generator load, thus make its angular velocity of rotation reach optimum angle speed, wind-driven generator Maximum Power Output.Described drive circuit 5 controls signal to the 8th control signal to corresponding first and amplifies and transmit the signal after amplifying to control signal to the 8th control signal corresponding control DC/DC converter by described first make-and-break time to DC/DC converter, it should be explicitly made clear at this point, in the present invention, first controls signal in the 8th control signal, sometime, processor only produces one in above-mentioned eight control signals according to actual conditions, such as: processor 4 transmit first control signal to drive circuit 5 time, drive circuit 5 amplifies this first control signal, this first control signal makes the ON time of DC/DC converter increase, because ON time increases, so, wind generator system can transmit more energy to direct current micro-some net, and then, regulate the output current of wind-driven generator, reach the object changing wind-driven generator load.
In the above-described embodiment, obtain current power by current sampling circuit and the first voltage sampling circuit, that is, it is the power output gathering wind generator system, in other mode, also can gather the electric current being incorporated to direct-current grid and DC bus-bar voltage and obtain current power, the specific implementation of this kind of mode is, current sampling circuit is set at the incoming end of DC bus, obtains current power by the current sampling circuit of the second voltage sampling circuit and setting.Based on such technical thought, the present invention also provides the control device of the second execution mode, as shown in Figure 5, this device comprises current sampling circuit 1, first voltage sampling circuit 2, second voltage sampling circuit 3, processor 4 and drive circuit 5, wherein, the voltage of described first voltage sampling circuit sampling wind generator system output; Described current sampling circuit and the second voltage sampling circuit are sampled respectively and are incorporated to the electric current of DC bus and the voltage of DC bus.Described processor receives the pattern variable order from energy manager, and the different value of this pattern variable order is corresponding with MPPT maximum power point tracking pattern, constant voltage mode or invariable power pattern respectively, when pattern variable order corresponds to MPPT maximum power point tracking pattern, the electric current of sampling according to current sampling circuit and the second voltage sampling circuit and magnitude of voltage calculate current power, the current voltage gathered according to the first voltage sampling circuit and the number of pole-pairs of generator calculate the generator angular velocity of rotation ω (K) of wind generator system, also calculate the difference e P (K) of current power and last power, the difference DELTA ω (K) of current generator angular velocity of rotation and last angular velocity of rotation and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d < Δ dmax, eP (K) > 0 and Δ ω (K) > 0 or Δ d=Δ dmax, during eP (K) > 0 and Δ ω (K) > 0, control signal last time is added described control signal increment and produces the first control signal, when Δ d < Δ dmax, eP (K) > 0 and Δ ω (K)≤0 or Δ d=Δ dmax, eP (K) > 0 and Δ ω (K)≤0, control signal last time is deducted described control signal increment and produces the second control signal, when Δ d < Δ dmax, eP (K)≤0 and Δ ω (K) > 0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K) > 0, control signal last time is deducted described control signal increment and produces the 3rd control signal, when Δ d < Δ dmax, eP (K)≤0 and Δ ω (K) < 0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K) < 0, control signal last time is added described control signal increment and produces the 4th control signal, described processor is when pattern variable order corresponds to constant voltage mode, the electric current of sampling according to current sampling circuit and the second voltage sampling circuit and voltage calculate the difference e P (K) of current power and current power and last power, according to the DC bus-bar voltage calculated difference eV (K) that desired voltage values and the second voltage sampling circuit are sampled, adopt PI to control to eV (K) and calculate wind generator system control signal increment Delta d=Kp × (eV (K)-eV (K-1))+Ki × eV (K) to the time of micro-capacitance sensor input electric energy, when eP (K) > 0, the control signal of last time is added described control signal increment and produces the 5th control signal, when eP (K)≤0, eV (K)≤ε or eV (K-1)≤ε, the control signal of last time is added described control signal increment exports as the 6th control signal, at eP (K)≤0, and eV (K) > ε and eV (K-1) > ε, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction, described processor corresponds to invariable power pattern in pattern variable order: the electric current of sampling according to current sampling circuit and the second voltage sampling circuit and voltage calculate current power P (K) and expects the difference e P (K) of power and current power, adopt PI to control to eP (K) and calculate wind generator system control signal increment Delta d=Kp × (eP (K)-eP (K-1))+Ki × eP (K) to the time of micro-capacitance sensor input electric energy, when P (K)-P (K-1) > 0, the control signal of last time is added described control signal increment exports as the 7th control signal, when P (K)-P (K-1)≤0, eP (K)≤ε or eP (K-1)≤ε, the control signal of last time is added described control signal increment exports as the 8th control signal, at P (K)-P (K-1)≤0, and during eP (K) > ε and eP (K-1) > ε, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction, described drive circuit amplification carrys out first of self processor and controls signal to the 8th control signal, and the signal after transmission amplification controls signal to the make-and-break time of the described switching circuit of the corresponding control of the 8th control signal by described first to switching circuit.
Based on above-mentioned technical thought, the present invention also discloses the control method that the present invention also discloses a kind of wind generator system access micro-capacitance sensor, this wind generator system accesses micro-capacitance sensor by switching circuit, the method comprises the steps: to receive the pattern variable order from energy manager, and the different value of this pattern variable order corresponds respectively to MPPT maximum power point tracking pattern, constant voltage mode or invariable power pattern, when pattern variable order corresponds to MPPT maximum power point tracking pattern, the electric current that sampling wind generator system exports and magnitude of voltage calculate current power, the generator angular velocity of rotation ω (K) of wind generator system is calculated according to the current voltage of collection and the number of pole-pairs of generator, also calculate the difference e P (K) of current power and last power, the difference DELTA ω (K) of current generator angular velocity of rotation and last angular velocity of rotation and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d < Δ dmax and eP (K) > 0 and Δ ω (K) > 0 or Δ d=Δ dmax and eP (K) > 0 and Δ ω (K) > 0 time, control signal last time is added described control signal increment and produces the first control signal, at Δ d < Δ dmax and eP (K) > 0 and Δ ω (K)≤0 or Δ d=Δ dmax and eP (K) > 0 and Δ ω (K)≤0 time, control signal last time is deducted described control signal increment and produces the second control signal, at Δ d < Δ dmax and eP (K)≤0 and Δ ω (K) > 0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K) > 0 time, control signal last time is deducted described control signal increment and produces the 3rd control signal, at Δ d < Δ dmax and eP (K)≤0 and Δ ω (K) < 0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K) < 0 time, control signal last time is added described control signal increment and produces the 4th control signal, in MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05, when the value of pattern variable order corresponds to constant voltage mode, the voltage of the DC bus of the electric current that sampling wind generator system exports and micro-capacitance sensor, according to the electric current of sampling and the difference e P (K) of voltage calculating current power and current power and last power, according to the DC bus-bar voltage calculated difference eV (K) of desired voltage values and sampling, adopt PI to control to eV (K) and calculate wind generator system control signal increment Delta d=Kp × (eV (K)-eV (K-1))+Ki × eV (K) to the time of micro-capacitance sensor input electric energy, when eP (K) > 0, the control signal of last time is added described control signal increment and produces the 5th control signal, when eP (K)≤0, eV (K)≤ε or eV (K-1)≤ε, the control signal of last time is added described control signal increment exports as the 6th control signal, at eP (K)≤0, and eV (K) > ε and eV (K-1) > ε, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction, in constant voltage mode, the span of described threshold value ε is between the 2%-5% of DC bus-bar voltage desired voltage values, the span of Kp is at 0.04/V
refto 1/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage, the span of Ki is at 0.01/V
refto 0.4/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage, invariable power pattern is corresponded to: the voltage of the DC bus of the electric current that sampling wind generator system exports and micro-capacitance sensor in the value of pattern variable order, according to the electric current of sampling and the difference e P (K) of voltage calculating current power P (K) and expectation power and current power, adopt PI to control to eP (K) and calculate wind generator system control signal increment Delta d=Kp × (eP (K)-eP (K-1))+Ki × eP (K) to the time of micro-capacitance sensor input electric energy, when P (K)-P (K-1) > 0, the control signal of last time is added described control signal increment exports as the 7th control signal, at P (K)-P (K-1)≤0 and eP (K)≤ε or eP (K-1)≤ε time, the control signal of last time is added described control signal increment exports as the 8th control signal, at P (K)-P (K-1)≤0 and eP (K) > ε and eP (K-1) > ε time, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction, in invariable power pattern, the span of described threshold value is that between the 2%-5% of expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, wherein P
reffor expecting power output, the span of Ki is at 0.001/P
refto 0.03/P
refbetween, wherein P
reffor expecting power output, the conducting that the 8th control signal transfers to described switching circuit and control switch circuit is controlled signal to by above-mentioned first.Described first to control signal to the 8th control signal be pwm signal respectively, and span is between 0 to 1.
In sum, because this control device can correspond to different mode of operations according to the different value of the pattern variable order from energy manager, and adjust the corresponding control signal of generation or pattern switching according to the mode of power difference, voltage difference and so on, thus, MPPT maximum power point tracking pattern, constant voltage mode or invariable power pattern can be operated in, like this, the input of direct-current grid is adjusted according to the energy requirement of direct-current grid, make wind generator system controlled, contribute to the stable operation realizing whole direct-current grid; In addition, owing to considering that power output, the power difference and voltage difference and so on of wind generator system realize controlling, so control precision is very high, reliability is also high, and capacity usage ratio is also high.
Claims (9)
1. the control device of wind generator system access micro-capacitance sensor, described wind generator system is connected to micro-capacitance sensor by switching circuit, it is characterized in that: this device comprises current sampling circuit, the first voltage sampling circuit, the second voltage sampling circuit, processor and drive circuit, wherein
Described current sampling circuit and the first voltage sampling circuit sample respectively wind generator system export electric current and voltage;
The voltage of described second voltage sampling circuit sampling DC bus;
Described processor receives the pattern variable order from energy manager, and the different value of this pattern variable order is corresponding with MPPT maximum power point tracking pattern, constant voltage mode or invariable power pattern respectively, when pattern variable order corresponds to MPPT maximum power point tracking pattern, the electric current of sampling according to current sampling circuit and the first voltage sampling circuit and magnitude of voltage calculate current power, the current voltage gathered according to the first voltage sampling circuit and the number of pole-pairs of generator calculate the generator angular velocity of rotation ω (K) of wind generator system, also calculate the difference e P (K) of current power and last power, the difference DELTA ω (K) of current generator angular velocity of rotation and last angular velocity of rotation and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d < Δ d max and eP (K)=0 or Δ d=Δ d max and eP (K)=0 time, do not change control signal last time, at Δ d < Δ d max and eP (K) > 0 and Δ ω (K) > 0 or Δ d=Δ d max and eP (K) > 0 and Δ ω (K) > 0 time, control signal last time is added described control signal increment and produces the first control signal, at Δ d < Δ d max and eP (K) > 0 and Δ ω (K)≤0 or Δ d=Δ d max and eP (K) > 0 and Δ ω (K)≤0 time, control signal last time is deducted described control signal increment and produces the second control signal, at Δ d < Δ d max and eP (K) < 0 and Δ ω (K) > 0 or Δ d=Δ d max and eP (K) < 0 and Δ ω (K) > 0 time, control signal last time is deducted described control signal increment and produces the 3rd control signal, at Δ d < Δ d max and eP (K) < 0 and Δ ω (K) < 0 or Δ d=Δ d max and eP (K) < 0 and Δ ω (K) < 0 time, control signal last time is added described control signal increment and produces the 4th control signal,
Described processor is when pattern variable order corresponds to constant voltage mode, the electric current of sampling according to current sampling circuit and the first voltage sampling circuit and voltage calculate the difference e P (K) of current power and current power and last power, according to the DC bus-bar voltage calculated difference eV (K) that desired voltage values and the second voltage sampling circuit are sampled, adopt PI to control to eV (K) and calculate wind generator system control signal increment Delta d=Kp × (eV (K)-eV (K-1))+Ki × eV (K) to the time of micro-capacitance sensor input electric energy, when eP (K) > 0, the control signal of last time is added described control signal increment and produces the 5th control signal, at eP (K)≤0 and eV (K)≤threshold value ε or eP (K)≤0 and eV (K-1)≤ε time, the control signal of last time is added described control signal increment exports as the 6th control signal, at eP (K)≤0 and eV (K) > threshold value ε and eV (K-1) > threshold value ε, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction,
Described processor corresponds to invariable power pattern in pattern variable order: the electric current of sampling according to current sampling circuit and the first voltage sampling circuit and voltage calculate current power P (K) and expects the difference e P (K) of power and current power, adopt PI to control to eP (K) and calculate wind generator system control signal increment Delta d=Kp × (eP (K)-eP (K-1))+Ki × eP (K) to the time of micro-capacitance sensor input electric energy, when P (K)-P (K-1) > 0, the control signal of last time is added described control signal increment exports as the 7th control signal, when P (K)-P (K-1)≤0, eP (K)≤threshold value ε or eP (K-1)≤threshold value ε, the control signal of last time is added described control signal increment exports as the 8th control signal, at P (K)-P (K-1)≤0, and during eP (K) > threshold value ε and eP (K-1) > threshold value ε, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction,
Described drive circuit amplification carrys out first of self processor and controls signal to the 8th control signal, and the signal after respective transmissions amplification controls signal to the make-and-break time of the described switching circuit of the corresponding control of the 8th control signal by described first to switching circuit.
2. the control device of wind generator system according to claim 1 access micro-capacitance sensor, is characterized in that: described first to control signal to the 8th control signal be pwm signal respectively, and span is between 0 to 1.
3. the control device of wind generator system access micro-capacitance sensor according to claim 1, it is characterized in that: in MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05; In constant voltage mode, the span of described threshold value ε is between the 2%-5% of DC bus-bar voltage desired voltage values; The span of Kp is at 0.04/V
refto 1/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage; In invariable power pattern, the span of described threshold value is that between the 2%-5% of expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, wherein P
reffor expecting power output; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, wherein P
reffor expecting power output.
4. the control device of wind generator system access micro-capacitance sensor, described wind generator system is connected to the DC bus of micro-capacitance sensor by switching circuit, it is characterized in that: this device comprises current sampling circuit, the first voltage sampling circuit, the second voltage sampling circuit, processor and drive circuit, wherein
The voltage that described first voltage sampling circuit sampling wind generator system exports;
Described current sampling circuit and the second voltage sampling circuit are sampled respectively and are incorporated to the electric current of DC bus and the voltage of DC bus;
Described processor receives the pattern variable order from energy manager, and the different value of this pattern variable order is corresponding with MPPT maximum power point tracking pattern, constant voltage mode or invariable power pattern respectively, when the value of pattern variable order corresponds to MPPT maximum power point tracking pattern, the electric current of sampling according to current sampling circuit and the second voltage sampling circuit and magnitude of voltage calculate current power, the current voltage gathered according to the first voltage sampling circuit and the number of pole-pairs of generator calculate the generator angular velocity of rotation ω (K) of wind generator system, also calculate the difference e P (K) of current power and last power, the difference DELTA ω (K) of current generator angular velocity of rotation and last angular velocity of rotation and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d < Δ d max and eP (K)=0 or Δ d=Δ d max and eP (K)=0 time, do not change control signal last time, at Δ d < Δ d max and eP (K) > 0 and Δ ω (K) > 0 or Δ d=Δ d max and eP (K) > 0 and Δ ω (K) > 0 time, control signal last time is added described control signal increment and produces the first control signal, at Δ d < Δ d max and eP (K) > 0 and Δ ω (K)≤0 or Δ d=Δ d max and eP (K) > 0 and Δ ω (K)≤0 time, control signal last time is deducted described control signal increment and produces the second control signal, at Δ d < Δ d max and eP (K) < 0 and Δ ω (K) > 0 or Δ d=Δ d max and eP (K) < 0 and Δ ω (K) > 0 time, control signal last time is deducted described control signal increment and produces the 3rd control signal, at Δ d < Δ d max and eP (K) < 0 and Δ ω (K) < 0 or Δ d=Δ d max and eP (K) < 0 and Δ ω (K) < 0 time, control signal last time is added described control signal increment and produces the 4th control signal,
Described processor is when the value of pattern variable order corresponds to constant voltage mode, the electric current of sampling according to current sampling circuit and the second voltage sampling circuit and voltage calculate the difference e P (K) of current power and current power and last power, according to the DC bus-bar voltage calculated difference eV (K) that desired voltage values and the second voltage sampling circuit are sampled, adopt PI to control to eV (K) and calculate wind generator system control signal increment Delta d=Kp × (eV (K)-eV (K-1))+Ki × eV (K) to the time of micro-capacitance sensor input electric energy, when eP (K) > 0, the control signal of last time is added described control signal increment and produces the 5th control signal, when eP (K)≤0, eV (K)≤threshold value ε or eV (K-1)≤threshold value ε, the control signal of last time is added described control signal increment exports as the 6th control signal, at eP (K)≤0, and eV (K) > threshold value ε and eV (K-1) > threshold value ε, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction,
Described processor corresponds to invariable power pattern in the value of pattern variable order: the electric current of sampling according to current sampling circuit and the second voltage sampling circuit and voltage calculate current power P (K) and expects the difference e P (K) of power and current power, adopt PI to control to eP (K) and calculate wind generator system control signal increment Delta d=Kp × (eP (K)-eP (K-1))+Ki × eP (K) to the time of micro-capacitance sensor input electric energy, when P (K)-P (K-1) > 0, the control signal of last time is added described control signal increment exports as the 7th control signal, at P (K)-P (K-1)≤0 and eP (K)≤ε or eP (K-1)≤ε time, the control signal of last time is added described control signal increment exports as the 8th control signal, at P (K)-P (K-1)≤0 and eP (K) > threshold value ε and eP (K-1) > threshold value ε time, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction,
Described drive circuit amplification carrys out first of self processor and controls signal to the 8th control signal, and the signal after transmission amplification controls signal to the make-and-break time of the described switching circuit of the corresponding control of the 8th control signal by described first to switching circuit.
5. the control device of wind generator system according to claim 4 access micro-capacitance sensor, is characterized in that: described first to control signal to the 8th control signal be pwm signal respectively, and span is between 0 to 1.
6. the control device of wind generator system access micro-capacitance sensor according to claim 4, it is characterized in that: in MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05; In constant voltage mode, the span of described threshold value ε is between the 2%-5% of DC bus-bar voltage desired voltage values; The span of Kp is at 0.04/V
refto 1/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage; In invariable power pattern, the span of described threshold value is that between the 2%-5% of expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, wherein P
reffor expecting power output; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, wherein P
reffor expecting power output.
7. the control method of wind generator system access micro-capacitance sensor, this wind generator system accesses micro-capacitance sensor by switching circuit, it is characterized in that: the method comprises the steps: to receive the pattern variable order from energy manager, and the different value of this pattern variable order corresponds respectively to MPPT maximum power point tracking pattern, constant voltage mode or invariable power pattern;
When pattern variable order corresponds to MPPT maximum power point tracking pattern, the electric current that sampling wind generator system exports and magnitude of voltage calculate current power, the generator angular velocity of rotation ω (K) of wind generator system is calculated according to the current voltage of collection and the number of pole-pairs of generator, also calculate the difference e P (K) of current power and last power, the difference DELTA ω (K) of current generator angular velocity of rotation and last angular velocity of rotation and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d < Δ d max and eP (K)=0 or Δ d=Δ d max and eP (K)=0 time, do not change control signal last time, at Δ d < Δ d max and eP (K) > 0 and Δ ω (K) > 0 or Δ d=Δ d max and eP (K) > 0 and Δ ω (K) > 0 time, control signal last time is added described control signal increment and produces the first control signal, at Δ d < Δ d max and eP (K) > 0 and Δ ω (K)≤0 or Δ d=Δ d max and eP (K) > 0 and Δ ω (K)≤0 time, control signal last time is deducted described control signal increment and produces the second control signal, at Δ d < Δ d max and eP (K) < 0 and Δ ω (K) > 0 or Δ d=Δ d max and eP (K) < 0 and Δ ω (K) > 0 time, control signal last time is deducted described control signal increment and produces the 3rd control signal, at Δ d < Δ d max and eP (K) < 0 and Δ ω (K) < 0 or Δ d=Δ d max and eP (K) < 0 and Δ ω (K) < 0 time, control signal last time is added described control signal increment and produces the 4th control signal,
When the value of pattern variable order corresponds to constant voltage mode, the voltage of the DC bus of the electric current that sampling wind generator system exports and micro-capacitance sensor, according to the electric current of sampling and the difference e P (K) of voltage calculating current power and current power and last power, according to the DC bus-bar voltage calculated difference eV (K) of desired voltage values and sampling, adopt PI to control to eV (K) and calculate wind generator system control signal increment Delta d=Kp × (eV (K)-eV (K-1))+Ki × eV (K) to the time of micro-capacitance sensor input electric energy, when eP (K) > 0, the control signal of last time is added described control signal increment and produces the 5th control signal, when eP (K)≤0, eV (K)≤ε or eV (K-1)≤ε, the control signal of last time is added described control signal increment exports as the 6th control signal, at eP (K)≤0, and eV (K) > ε and eV (K-1) > ε, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction,
Invariable power pattern is corresponded to: the voltage of the DC bus of the electric current that sampling wind generator system exports and micro-capacitance sensor in the value of pattern variable order, according to the electric current of sampling and the difference e P (K) of voltage calculating current power P (K) and expectation power and current power, adopt PI to control to eP (K) and calculate wind generator system control signal increment Delta d=Kp × (eP (K)-eP (K-1))+Ki × eP (K) to the time of micro-capacitance sensor input electric energy, when P (K)-P (K-1) > 0, the control signal of last time is added described control signal increment exports as the 7th control signal, at P (K)-P (K-1)≤0 and eP (K)≤threshold value ε or eP (K-1)≤threshold value ε time, the control signal of last time is added described control signal increment exports as the 8th control signal, at P (K)-P (K-1)≤0 and eP (K) > threshold value ε and eP (K-1) > threshold value ε time, processor produces pattern variable modify instruction and switches to MPPT maximum power point tracking pattern to make energy manager according to this instruction,
The conducting that the 8th control signal transfers to described switching circuit and control switch circuit is controlled signal to by above-mentioned first.
8. the control method of wind generator system according to claim 7 access micro-capacitance sensor, is characterized in that: described first to control signal to the 8th control signal be pwm signal respectively, and span is between 0 to 1.
9. the control method of the wind generator system access micro-capacitance sensor according to claim 7 or 8, it is characterized in that: in MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05; In constant voltage mode, the span of described threshold value ε is between the 2%-5% of DC bus-bar voltage desired voltage values; The span of Kp is at 0.04/V
refto 1/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, wherein V
reffor the expectation voltage of DC bus-bar voltage; In invariable power pattern, the span of described threshold value is that between the 2%-5% of expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, wherein P
reffor expecting power output; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, wherein P
reffor expecting power output.
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| CN202586340U (en) * | 2012-05-18 | 2012-12-05 | 黄刚 | Low-voltage bipolar direct current micro-power grid system |
| CN102931683A (en) * | 2012-11-02 | 2013-02-13 | 浙江工业大学 | Wind-solar direct current microgrid grid-connection control method based on substation typical daily load curve |
| CN102931653A (en) * | 2012-11-02 | 2013-02-13 | 浙江工业大学 | Comprehensive coordination control method of wind-solar direct current micro-grid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202586340U (en) * | 2012-05-18 | 2012-12-05 | 黄刚 | Low-voltage bipolar direct current micro-power grid system |
| CN102931683A (en) * | 2012-11-02 | 2013-02-13 | 浙江工业大学 | Wind-solar direct current microgrid grid-connection control method based on substation typical daily load curve |
| CN102931653A (en) * | 2012-11-02 | 2013-02-13 | 浙江工业大学 | Comprehensive coordination control method of wind-solar direct current micro-grid |
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Application publication date: 20131113 Assignee: ZHEJIANG JEC NEW ENERGY TECHNOLOGY CO., LTD. Assignor: Jiaxing University Contract record no.: 2017330000087 Denomination of invention: Device and method for controlling wind turbine system to access DC (direct current) micro-grid Granted publication date: 20150930 License type: Common License Record date: 20170626 |