CN204290321U - Micro-capacitance sensor voltage perturbation control system - Google Patents

Abstract

The utility model provides a kind of micro-capacitance sensor voltage perturbation control system, and this system comprises: energy-storage units, power converter cells, coordinate transform and active power calculate unit, power controller, voltage controller, adaptive slicer, current controller, PWM generator; Adaptive slicer, the reactive current reference value exported for the active current reference value that exports power controller and voltage controller carries out amplitude limit, exports meritorious reference current and idle reference current; PWM generator, produces PWM waveform for carrying out PWM to voltage control signal, inputs in power converter cells.The utility model to solve in prior art voltage frequent fluctuation and reactive power in micro-capacitance sensor to be difficult to optimize the technical problem of distributing, and reaches the voltage fluctuation effectively suppressing micro-capacitance sensor, ensures the technique effect that voltage stabilization runs.

Description

Micro-capacitance sensor voltage perturbation control system

Technical field

The utility model relates to micro-capacitance sensor technical field, particularly a kind of micro-capacitance sensor voltage perturbation control system.

Background technology

In the last few years, along with the fast development of micro-capacitance sensor, the micro-capacitance sensor formed with wind power generation and solar power generation has progressively become the main flow of new energy.Because wind power generation and photovoltaic generation have randomness, fluctuation and intermittent feature, often there is frequent fluctuation in the voltage in the micro-capacitance sensor that wind light generation is formed, causes voltage to perturb, thus had a strong impact on the voltage stability of micro-capacitance sensor.In order to solve the problem, in micro-capacitance sensor, access large-scale energy storage device, to be used for stabilizing the voltage in micro-capacitance sensor and frequency.By the introducing of extensive energy storage technology, can effectively improve fitful power operation characteristic in real time, promote the ability of regulation and control of micro-capacitance sensor, thus improve stability and the reliability of micro-capacitance sensor operation, too increase the grid-connected ability of micro-capacitance sensor simultaneously.

At present; be that the novel energy-storing technology of representative is from low capacity, the investigation and application developing into Large Copacity and scale energy-storage system on a small scale with electrochemical energy storage; by the research to the wind-solar-storage joint electricity generation system in micro-capacitance sensor; a difficult problem for extensive new-energy grid-connected can be solved; rely on the energy-storage system of wind-light storage Demonstration Station, the research comprising the multinomial relevant problem such as combined generating system overall view monitoring, O&M technology can also be carried out.

But how to make full use of the perturbation control that large-scale energy storage device participates in micro-capacitance sensor voltage, the power division in Optimized Operation micro-capacitance sensor, not yet proposes effective solution at present.

Utility model content

The utility model embodiment provides a kind of micro-capacitance sensor voltage perturbation control system, is difficult to optimize the technical problem of distributing to solve in prior art voltage frequent fluctuation and reactive power in micro-capacitance sensor.This system comprises:

Energy-storage units, power converter cells, coordinate transform and active power calculate unit, power controller, voltage controller, adaptive slicer, current controller, PWM (Pulse Width Modulation, pulse width modulation) generator;

Wherein, described energy-storage units, for powering for micro-capacitance sensor;

Described power converter cells, is connected with the output of described energy-storage units, outputs current to for what regulate described energy-storage units the reactive current demand meeting described micro-capacitance sensor;

Described coordinate transform and active power calculate unit, input is connected with the output of described power converter cells, variable transitions on the ABC coordinate system described power converter cells exported is to the variable on rotating coordinate system dq, wherein, the output of described coordinate transform and active power calculating unit comprises: active current feedback output end, reactive current feedback output end and active power output;

Described power controller, input is connected with active power reference value, and is connected with the active power output that described coordinate transform and active power calculate unit, and output comprises: active current reference value output;

Described voltage controller, input is connected with micro-capacitance sensor voltage reference value with micro-capacitance sensor voltage, and output comprises: reactive current reference value output;

Described adaptive slicer, input is connected with the reactive current reference value output of described voltage controller with the active current reference value output of described power controller, the reactive current reference value exported for the active current reference value that exports described power controller and described voltage controller carries out amplitude limit, exports meritorious reference current and idle reference current;

Described current controller, input is connected with the output of described adaptivity amplitude limiter, and be connected with reactive current feedback output end with the active current feedback output end that described coordinate transform and active power calculate unit, for regulating the active current of micro-capacitance sensor and reactive current, enable active current and reactive current follow the tracks of described meritorious reference current and idle reference current, what the output of described current controller exported is voltage control signal;

Described PWM generator, is connected with the output of described current controller, produces PWM waveform, input in described power converter cells for carrying out PWM to described voltage control signal.

In one embodiment, described adaptive slicer comprises: active current amplitude limiter circuit, reactive current amplitude limiter circuit, first square for the treatment of circuit, second square for the treatment of circuit, summation circuit, extraction of square root treatment circuit, circuit of minimizing, wherein:

The input of described active current amplitude limiter circuit is connected with the active current reference value output of described power controller, and the output of described active current amplitude limiter circuit is connected with the first input end of described circuit of minimizing;

The input of described reactive current amplitude limiter circuit is connected with the reactive current reference value output of described voltage controller, and the output of described reactive current amplitude limiter circuit is the idle reference current output of described adaptive slicer;

The reference current amplitude limit value being input as the output of described power converter cells of described first square for the treatment of circuit, the output of described first square for the treatment of circuit and being connected on the occasion of input of described summation circuit;

The input of described second square for the treatment of circuit is connected with the reactive current reference value output of described voltage controller, and the output of described second square for the treatment of circuit is connected with the negative value input of described summation circuit;

The output of described summation circuit is connected with the input of described extraction of square root treatment circuit, and the output of described extraction of square root treatment circuit is connected with the second output of described circuit of minimizing;

The output of described circuit of minimizing is the meritorious reference current output of described adaptive slicer.

In one embodiment, described power converter cells comprises: three-phase inverter, the energy of required compensation during for being the perturbation of micro-capacitance sensor voltage by the energy conversion of described energy-storage units;

Filter reactance, is connected with described three-phase inverter, is converted to the high order harmonic component produced when micro-capacitance sensor exchanges reactive power for the direct current power in energy-storage units described in filtering.

In one embodiment, described three-phase inverter comprises: under controlling at PWM, direct current energy is transformed to AC energy.

In one embodiment, be provided with the first pi regulator in described power controller, described first pi regulator is used for the set value of the power compensated needed for the active power that exported by described three-phase inverter, is input in described micro-capacitance sensor;

Be provided with the second pi regulator in described voltage controller, described second pi regulator is used for the voltage perturbation set point compensated needed for the reactive power that exported by described three-phase inverter, is input in described micro-capacitance sensor.

In one embodiment, described PWM generator also for interlocking the two-way drive singal on the same brachium pontis of main circuit, electrical isolation and power amplification.

In one embodiment, described three-phase inverter is made up of 6 full-controlled switch devices.

In one embodiment, in described power controller and described voltage controller, be provided with pi regulator, for carrying out PI adjustment.

In one embodiment, described PWM generator is the PWM generator of SKYPER32 model.

In the utility model embodiment, provide a kind of micro-capacitance sensor voltage perturbation control system, when there is frequent fluctuation in voltage in micro-capacitance sensor, by detecting the voltage and current in micro-capacitance sensor, applied voltage controls perturbation device, make the reactive current that the power conversion in extensive energy-storage units becomes to stablize in micro-capacitance sensor, transient voltage is enable to return to normal level, simultaneously by adding adaptive slicer, enable micro-capacitance sensor voltage when wide fluctuations, be stabilized in normal level quickly, thus ensure that the safe and reliable operation of micro-capacitance sensor, the utility model to solve in prior art voltage frequent fluctuation and reactive power in micro-capacitance sensor to be difficult to optimize the technical problem of distributing, reach the voltage fluctuation effectively suppressing micro-capacitance sensor, ensure the technique effect that voltage stabilization runs.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide further understanding of the present utility model, forms a application's part, does not form restriction of the present utility model.In the accompanying drawings:

Fig. 1 is the structural representation of the micro-capacitance sensor voltage perturbation control system of the utility model embodiment;

Fig. 2 is the circuit diagram of the power converter cells of the utility model embodiment;

Fig. 3 is the circuit diagram of the adaptive slicer of the utility model embodiment;

Fig. 4 is that the adaptive slicer of the utility model embodiment exports reference current track schematic diagram;

Voltage perturbation device output power curve schematic diagram when Fig. 5 is the voltage on line side decline of the utility model embodiment;

Fig. 6 is the power converter cells inner ring Current Control block diagram of the utility model embodiment;

Fig. 7 is the general frame figure of the control system of the utility model embodiment;

Fig. 8 is the micro-capacitance sensor structure chart of the perturbation device with voltage of the utility model embodiment;

Fig. 9 is the phase voltage waveform schematic diagram that the voltage perturbation device of the utility model embodiment exports;

Figure 10 is the phase current waveform schematic diagram that the voltage perturbation device of the utility model embodiment exports;

Figure 11 is micro-capacitance sensor voltage magnitude perturbation waveform schematic diagram before the compensation of the utility model embodiment;

Figure 12 is micro-capacitance sensor voltage magnitude perturbation waveform schematic diagram after the compensation of the utility model embodiment;

Figure 13 is the active power waveform schematic diagram that the voltage perturbation device of the utility model embodiment exports;

Figure 14 is the reactive power waveform schematic diagram that the voltage perturbation device of the utility model embodiment exports;

Figure 15 is the hardware principle circuit block diagram of the voltage perturbation device of the utility model embodiment;

Figure 16 is the micro-capacitance sensor voltage perturbation control method flow chart of the utility model embodiment.

Embodiment

For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with execution mode and accompanying drawing, the utility model is described in further details.At this, exemplary embodiment of the present utility model and illustrating for explaining the utility model, but not as to restriction of the present utility model.

In this example, provide a kind of micro-capacitance sensor voltage perturbation control system, as shown in Figure 1, comprise: energy-storage units, power converter cells, coordinate transform and active power calculate unit, power controller, voltage controller, adaptive slicer, current controller, PWM generator, below the function of these component units and annexation each other and the signal flow direction are described;

1) energy-storage units, for powering for micro-capacitance sensor;

2) power converter cells, is connected with the output of energy-storage units, outputs current to for what regulate energy-storage units the reactive current demand meeting described micro-capacitance sensor;

3) coordinate transform and active power calculate unit, input is connected with the output of power converter cells, variable transitions on the ABC coordinate system described power converter cells exported is to the variable on rotating coordinate system dq, wherein, the output of described coordinate transform and active power calculating unit comprises: active current feedback output end, reactive current feedback output end and active power output;

4) power controller, input is connected with active power reference value, and is connected with the active power output that described coordinate transform and active power calculate unit, and output comprises: active current reference value output;

5) voltage controller, input is connected with micro-capacitance sensor voltage reference value with micro-capacitance sensor voltage, and output comprises: reactive current reference value output;

6) adaptive slicer, input is connected with the reactive current reference value output of described voltage controller with the active current reference value output of described power controller, the reactive current reference value exported for the active current reference value that exports described power controller and described voltage controller carries out amplitude limit, exports meritorious reference current and idle reference current;

7) current controller, input is connected with the output of described adaptivity amplitude limiter, and be connected with reactive current feedback output end with the active current feedback output end that described coordinate transform and active power calculate unit, for regulating the active current of micro-capacitance sensor and reactive current, enable active current and reactive current follow the tracks of described meritorious reference current and idle reference current, what the output of described current controller exported is voltage control signal;

8) PWM generator, is connected with the output of described current controller, produces PWM waveform, input in described power converter cells for carrying out PWM to described voltage control signal.

In this example, provide a kind of micro-capacitance sensor voltage perturbation control system, when there is frequent fluctuation in voltage in micro-capacitance sensor, by detecting the voltage and current in micro-capacitance sensor, applied voltage controls perturbation device, make the reactive current that the power conversion in extensive energy-storage units becomes to stablize in micro-capacitance sensor, transient voltage is enable to return to normal level, simultaneously by adding adaptive slicer, enable micro-capacitance sensor voltage when wide fluctuations, be stabilized in normal level quickly, thus ensure that the safe and reliable operation of micro-capacitance sensor, the utility model to solve in prior art voltage frequent fluctuation and reactive power in micro-capacitance sensor to be difficult to optimize the technical problem of distributing, reach the voltage fluctuation effectively suppressing micro-capacitance sensor, ensure the technique effect that voltage stabilization runs.

Below in conjunction with Fig. 1, the concrete effect of above-mentioned several component units and operation principle are described:

1) extensive energy-storage units (that is, above-mentioned energy-storage units)

Extensive energy-storage units in micro-capacitance sensor, primarily of many group all kinds battery compositions, by the stored energy of wind energy and solar energy in the battery, is powered for micro-capacitance sensor and stabilizes voltage.

2) power converter cells

Power converter cells can be made up of three-phase power electronic converter and filter reactance, adopt the general principle of synchronous compensator, to be connected with micro-capacitance sensor through a series reactance from commutation bridge circuit, according to the instruction inputting micro-capacitance sensor voltage and active power, suitably regulate its ac-side current, to meet micro-capacitance sensor reactive current demand, realize the object of dynamic passive compensation, finally realize the fast and stable of voltage.Concrete, the energy of required compensation when the energy conversion of extensive energy-storage units is the perturbation of micro-capacitance sensor voltage by the three-phase inverter in this power converter cells, the direct current power be used in filtering energy-storage units of the filter reactance in power converter cells is converted to the high order harmonic component produced when micro-capacitance sensor exchanges reactive power.

Concrete, the structure of converter can be as shown in Figure 2, be made up of DC capacitor C, IGBT, filter inductance L and resistance R etc., controller is according to micro-capacitance sensor voltage fluctuation situation, direct current energy, to system input perception or capacitive reactive power electric current, can be transformed to AC energy more rapidly by 6 the full-controlled switch device IGBT arranged in three-phase inverter by the three-phase inverter consisted of 6 full-controlled switch devices under PWM control method.

With U _arepresent converter output voltage u _aa, u _aband u _acspace vector, with U _srepresent micro-capacitance sensor voltage u _sa, u _sb, u _scspace vector.

Then, the pass of converter output voltage and DC voltage is:

$\left\{\begin{array}{c}{u}_{\mathrm{Aa}}={\mathrm{MU}}_{\mathrm{dc}}\sin (\mathrm{\ωt}-\mathrm{\δ})\\ u_{\mathrm{Ab}}={\mathrm{MU}}_{\mathrm{dc}}\sin (\mathrm{\ωt}-\frac{2\mathrm{\π}}{3}-\mathrm{\δ})\\ u_{\mathrm{Ac}}={\mathrm{MU}}_{\mathrm{dc}}\sin (\mathrm{\ωt}+\frac{2\mathrm{\π}}{3}-\mathrm{\δ})\end{array}\right.$ (formula 1)

Wherein, M is proportionality coefficient, U _dcfor DC voltage, δ is U _aand U _sbetween angle, be controlled amounts.

From the power converter cells schematic diagram of Fig. 2, can draw:

$\left\{\begin{array}{c}{u}_{\mathrm{Aa}}={\mathrm{Ri}}_a+L\frac{{\mathrm{di}}_a}{\mathrm{dt}}+u_{\mathrm{Sa}}\\ u_{\mathrm{Ab}}={\mathrm{Ri}}_b+L\frac{{\mathrm{di}}_b}{\mathrm{dt}}+u_{\mathrm{Sb}}\\ u_{\mathrm{Ac}}={\mathrm{Ri}}_c+L\frac{{\mathrm{di}}_c}{\mathrm{dt}}+u_{\mathrm{Sc}}\end{array}\right.$ (formula 2)

Formula 1 is substituted into formula 2, can obtain:

$\left\{\begin{array}{c}L\frac{{\mathrm{di}}_a}{\mathrm{dt}}={\mathrm{MU}}_{\mathrm{dc}}\sin (\mathrm{\ωt}-\mathrm{\δ})-u_{\mathrm{Sa}}-{\mathrm{Ri}}_a\\ L\frac{{\mathrm{di}}_b}{\mathrm{dt}}={\mathrm{MU}}_{\mathrm{dc}}\sin (\mathrm{\ωt}-\frac{2\mathrm{\π}}{3}-\mathrm{\δ})-u_{\mathrm{Sb}}-{\mathrm{Ri}}_b\\ L\frac{{\mathrm{di}}_C}{\mathrm{dt}}={\mathrm{MU}}_{\mathrm{dc}}\sin (\mathrm{\ωt}+\frac{2\mathrm{\π}}{3}-\mathrm{\δ})-u_{\mathrm{Sc}}-{\mathrm{Ri}}_C\end{array}\right.$ (formula 3)

DC voltage equation can be obtained by energy relationship:

$\frac{d}{\mathrm{dt}}\left(\frac{1}{2}{\mathrm{CU}}_{\mathrm{dc}}^2\right)=-[u_{\mathrm{Aa}}{i}_a+u_{\mathrm{Ab}}{i}_b+u_{\mathrm{Ac}}{i}_c]$ (formula 4)

Formula 1 is substituted in formula 4, and carries out simplification and can obtain:

$\frac{{\mathrm{dU}}_{\mathrm{dc}}}{\mathrm{dt}}=-\frac{M}{C}[i_a\sin (\mathrm{\ωt}-\mathrm{\δ})+i_b\sin (\mathrm{\ωt}-\frac{2\mathrm{\π}}{3}-\mathrm{\δ})+i_C\sin (\mathrm{\ωt}+\frac{2\mathrm{\π}}{3}-\mathrm{\δ})$ (formula 5)

Further, the Mathematical Modeling of the main circuit unit under ABC coordinate system can be drawn:

$\left\{\begin{array}{c}L\frac{{\mathrm{di}}_a}{\mathrm{dt}}={\mathrm{MU}}_{\mathrm{dc}}\sin (\mathrm{\ωt}-\mathrm{\δ})-u_{\mathrm{Sa}}-{\mathrm{Ri}}_a\\ L\frac{{\mathrm{di}}_b}{\mathrm{dt}}={\mathrm{MU}}_{\mathrm{dc}}\sin (\mathrm{\ωt}-\frac{2\mathrm{\π}}{3}-\mathrm{\δ})-u_{\mathrm{Sb}}-{\mathrm{Ri}}_b\\ L\frac{{\mathrm{di}}_c}{\mathrm{dt}}={\mathrm{MU}}_{\mathrm{dc}}\sin (\mathrm{\ωt}+\frac{2\mathrm{\π}}{3}-\mathrm{\δ})-u_{\mathrm{Sc}}-{\mathrm{Ri}}_c\\ \frac{d{U}_{\mathrm{dc}}}{\mathrm{dt}}=-\frac{M}{C}[i_a\sin (\mathrm{\ωt}-\mathrm{\δ})+i_b\sin (\mathrm{\ωt}-\frac{2\mathrm{\π}}{3}-\mathrm{\δ})+i_c\sin (\mathrm{\ωt}+\frac{2\mathrm{\π}}{3}-\mathrm{\δ})\end{array}\right.$ (formula 6)

3) coordinate transform and active power calculate unit

Analyze above-mentioned formula 6, can learn the Changing Pattern of each variable of power converter cells, the coefficient in formula 6 changes in time, during analysis and solution, difficulty is larger, therefore, application ABC/dq conversion, by the variable transitions on ABC coordinate system to the variable on rotating coordinate system dq.Suppose three-phase equilibrium, and it is consistent with micro-capacitance sensor space vector of voltage US direction to get d direction of principal axis, then the Mathematical Modeling of carrying out after dq coordinate transform is:

$\frac{d}{\mathrm{dt}}\left[\begin{array}{c}{i}_d\\ i_q\\ U_{\mathrm{dc}}\end{array}\right]=\left[\begin{array}{ccc}-\frac{R}{L}& -\mathrm{\ω}& \frac{M}{L}\sin \mathrm{\δ}\\ -\mathrm{\ω}& -\frac{R}{L}& \frac{M}{L}\cos \mathrm{\δ}\\ -\frac{M}{C}\sin \mathrm{\δ}& -\frac{M}{C}\sin \mathrm{\δ}& 0\end{array}\right]\left[\begin{array}{c}{i}_d\\ i_q\\ U_{\mathrm{dc}}\end{array}\right]+\frac{1}{L}\left[\begin{array}{c}-U_m\\ 0\\ 0\end{array}\right]$ (formula 7)

Wherein, i _drepresent the d shaft current (the active current feedback of inner ring current controller) in dq coordinate system, i _qrepresent the q shaft current (the reactive current feedback of inner ring current controller) in dq coordinate system, U _mrepresent micro-capacitance sensor phase voltage amplitude.

Because formula 7 is Differential Equation with Constant Coefficients group, can calculate each variable of unit to coordinate transform and active power easily and carry out analysis and solution, after dq conversion, unit equivalent voltage is direct voltage, for:

$\left\{\begin{array}{c}{v}_d=M\sin \mathrm{\δ}\\ v_q=M\cos \mathrm{\δ}\end{array}\right.$ (formula 8)

Therefore, the pass in dq reference axis between each voltage of unit, electric current is:

$L\frac{d}{\mathrm{dt}}\left[\begin{array}{c}{i}_d\\ i_q\end{array}\right]=\left[\begin{array}{cc}-R& \mathrm{\ωL}\\ -\mathrm{\ωL}& -R\end{array}\right]\left[\begin{array}{c}{i}_q\\ i_q\end{array}\right]+\left[\begin{array}{c}{v}_d-U_m\\ v_q\end{array}\right]$ (formula 9)

According to instantaneous power theory, the active-power P that can obtain unit output is:

$P=\frac{3}{2}(U_{\mathrm{Sd}}{i}_d+U_{\mathrm{Sq}}{i}_q)=\frac{3}{2}{U}_m{i}_d$ (formula 10)

Therefore, this unit exports d shaft current i _d, feed back as the active current of inner ring current controller, export q shaft current i _q, feed back as the reactive current of inner ring current controller, active power of output P, as the active power feedback of Outer Loop Power Controller.

4) adaptive slicer

When micro-capacitance sensor voltage fluctuation, in order to realize the fast quick-recovery of transient voltage enabling capabilities, reduce conventional control methods exports reference current amplitude limit value constraint to the outer ring controller of power, propose a kind of adaptive slicer, its structure chart as shown in Figure 3, this adaptive slicer can in micro-capacitance sensor voltage fluctuation, even during fault, the idle reference current exported according to the outer ring controller of power carrys out dynamic conditioning and to gain merit the amplitude limit value of reference current, the idle reference current of output is maximized, finally can recover the stable of micro-capacitance sensor voltage more quickly.

As shown in Figure 3, this adaptive slicer can comprise: active current amplitude limiter circuit, reactive current amplitude limiter circuit, first square for the treatment of circuit, second square for the treatment of circuit, the first summation circuit, the treatment circuit that extracts square root, circuit of minimizing, wherein: the input of active current amplitude limiter circuit is connected with the active current reference value output of power controller, and the output of active current amplitude limiter circuit is connected with the first input end of circuit of minimizing; The input of reactive current amplitude limiter circuit is connected with the reactive current reference value output of voltage controller, and the output of reactive current amplitude limiter circuit is the idle reference current output of adaptive slicer; The reference current amplitude limit value being input as power converter cells output of first square for the treatment of circuit, the output of first square for the treatment of circuit and being connected on the occasion of input of the first summation circuit; The input of second square for the treatment of circuit is connected with the reactive current reference value output of voltage controller, and the output of second square for the treatment of circuit is connected with the negative value input of the first summation circuit; The output of the first summation circuit is connected with the input of extraction of square root treatment circuit, and the extraction of square root output for the treatment of circuit is connected with the second output of circuit of minimizing; The output of circuit of minimizing is the meritorious reference current output of adaptive slicer.

In order to anti-locking system overcurrent, current reference value will carry out amplitude limit usually in Outer Loop Power Controller, and the maximum current that converter exports generally gets 1.5 times of rated current, i.e. the amplitude limit condition of the current reference value of converter output is:

$i_{\lim }^{*}=1.5i_e$ (formula 11)

Wherein, represent the reference current amplitude limit value that converter exports, i _erepresent the rated value of micro-capacitance sensor side alternating current, reference current amplitude limit value comprise meritorious reference current amplitude limit value with idle reference current amplitude limit value relation between the two meets:

$i_{\lim }^{*}=\sqrt{i_{\mathrm{d\; lim}}^{*2}+i_{\mathrm{qlim}}^{*2}}$ (formula 12)

The operation principle of this adaptive slicer as shown in Figure 3, can be drawn by Fig. 3 with output area be:

$i_q^{*}=\left\{\begin{array}{cc}{i}_{q1}^{*},& -i_{\lim }^{*}<i_{q1}^{*}<i_{\lim }^{*}\\ i_{\lim }^{*},& i_{q1}^{*}\&GreaterEqual;i_{\lim }^{*}\\ -i_{\lim }^{*},& i_{q1}^{*}\&le;-i_{\lim }^{*}\end{array}\right.$ (formula 13)

$i_d^{*}=\left\{\begin{array}{cc}{i}_{d1}^{*},& i_{\mathrm{dlim}}^{*}<i_{d1}^{*}\&le;\sqrt{i_{\lim }^{*2}-i_{q1}^{*2}}\\ \sqrt{i_{\lim }^{*2}-i_{q1}^{*2}},& \sqrt{i_{\lim }^{*2}-i_{q1}^{*2}}<i_{d1}^{*}<i_{\lim }^{*}\\ i_{\lim }^{*},& i_{d1}^{*}\&GreaterEqual;i_{\lim }^{*}\\ i_{\mathrm{dlim}}^{*},& i_{d1}^{*}\&le;i_{\mathrm{dlim}}^{*}\end{array}\right.$ (formula 14)

From above-mentioned formula 13 and formula 14, when micro-capacitance sensor voltage drop, the reference current track that adaptive slicer exports as shown in Figure 4.At initial launch point D, the reference current that adaptive slicer exports is identical with the reference current that outer ring controller exports, for with when micro-capacitance sensor voltage slightly declines, the reference current that outer ring controller exports is still within the semicircle of Fig. 4, system will reach a new stable operating point M, but when micro-capacitance sensor voltage declines to a great extent, meritorious, the idle reference current that export causing outer ring controller significantly increase, and work as reference current increase to its amplitude limit condition time, can obtain according to formula 13 and formula 14: the meritorious reference current that adaptive slicer exports become therefore reference current track reaches A point, and can turn clockwise along the semicircle of reference current control, as shown in Figure 4.Different according to the degree of micro-capacitance sensor voltage drop, reference current vector may reach the rear stable operation of B point, or continues to rotate to C point.When reference current vector moves to a some C, now the power-factor angle that converter exports for therefore, a converter output reactive power.

As shown in Figure 5, when being micro-capacitance sensor voltage drop, the power curve that converter exports.Supposing the system starts stable operation at Z point, and micro-capacitance sensor voltage declines suddenly, makes operating point become F point in Fig. 5.When adopting conventional control methods, limit the idle reference current that outer ring controller exports, then its idle reference current exported maximum is after transient state, system is in the stable operation of M point, and micro-capacitance sensor voltage is now U ₁.And after have employed adaptive slicer, the direct maximum of idle reference current of output can be made after transient state, system will be transitioned into the stable operation of N point, and now micro-capacitance sensor voltage is U ₂.As shown in Figure 5, adopt adaptive slicer that the ability of converter output reactive power can be made to become large, the recovery for micro-capacitance sensor voltage is more favourable, is better than conventional control method.

5) current controller and PWM generator

Current controller mainly regulates active current and reactive current, and the object that current inner loop controls is the output current i making main circuit unit _d, i _qits reference value can be followed the tracks of, thus make micro-capacitance sensor voltage U _sbe stabilized in a definite value needed, and export pwm control signal.As can be seen from formula 9: i _d, i _qcan by v _d, v _qregulating and controlling, but between d axle with q axle, there is coupling, i in each voltage of converter, the magnitude of current _dchange will cause v _qwith i _qchange, vice versa thereupon.It separately cannot be carried out independent analysis by the loop of coupling, therefore needs to carry out decoupling zero.The PI controller output valve of current inner loop increases feedforward compensation item ω Li _d, ω Li _q, concrete control block diagram as shown in Figure 6.

In Fig. 6, the transfer function of converter output voltage is:

$\left\{\begin{array}{c}{v}_d=(K_P+\frac{K_I}{s})(i_d^{*}-i_d)-\mathrm{\&omega;}{\mathrm{Li}}_q+U_m\\ v_q=(K_P+\frac{K_I}{s})(i_q^{*}-i_q)+\mathrm{\&omega;}{\mathrm{Li}}_d\end{array}\right.$ (formula 15)

Wherein, K _pand K _ibe respectively proportionality coefficient and the integral coefficient of PI controller, formula 15 brought in formula 9, can obtain:

$L\frac{d}{\mathrm{dt}}\left[\begin{array}{c}{i}_d\\ i_q\end{array}\right]=\left[\begin{array}{cc}R+K_P+\frac{K_I}{s}& 0\\ 0& R+K_P+\frac{K_I}{s}\end{array}\right]\left[\begin{array}{c}{i}_d\\ i_q\end{array}\right]+(K_P+\frac{K_I}{s})\left[\begin{array}{c}{i}_d^{*}\\ i_q^{*}\end{array}\right]$ (formula 16)

Wherein, off diagonal element is 0, it can thus be appreciated that increase feedforward compensation in the PI output of current inner loop after, d, q axle variable achieves uneoupled control, and current controller finally exports v _d, v _qto PWM generator, the control signal v that PWM generator received current controller exports _d, v _q, after PWM, produce PWM waveform.

PWM generator not only for generation of PWM waveform, also for interlocking the two-way drive singal on the same brachium pontis of main circuit, electrical isolation and power amplification, thus it is identical with micro-capacitance sensor with voltage magnitude to ensure to export fundamental frequency.

6) voltage controller and power controller

Voltage controller and power controller are all outer ring controllers, also can be referred to as Active Power Controller and voltage controller, are all provided with PI (proportional integral) adjuster in power controller and voltage controller, for carrying out PI adjustment.

Wherein, Active Power Controller, is regulated by PI, exports the set-point of active current carry out the adjustment of converter active power of output, active power set-point compares with converter active power of output value, then regulates through PI, produces d shaft current reference value with the active power voltage that stabilization transform device exports. meet:

$i_{d1}^{*}=(K_{\mathrm{dP}}+\frac{K_{\mathrm{dI}}}{s})(P^{*}-P)$ (formula 17)

Wherein, K _dPand K _dIbe respectively proportionality coefficient and the integral coefficient of d axle PI controller.

Voltage controller, is regulated by PI, exports the set-point of reactive current carry out the adjustment of converter output reactive power, and then regulate the fluctuation of micro-capacitance sensor voltage.Micro-capacitance sensor voltage perturbation controlling unit is by micro-capacitance sensor voltage U _swith its reference value comparison, produce q shaft current reference value to control micro-capacitance sensor voltage, prevent micro-capacitance sensor voltage from perturbing, wherein, demand fulfillment:

$i_{q1}^{*}=(K_{\mathrm{qP}}+\frac{K_{\mathrm{qI}}}{s})(U_S^{*}-U_S)$ (formula 18)

Wherein, K _qPand K _qIbe respectively proportionality coefficient and the integral coefficient of q axle PI controller.

Namely, the pi regulator arranged in power controller, the set value of the power that the active power that converter exports can be compensated as required, be input in micro-capacitance sensor, keep the active power balance in micro-capacitance sensor, the pi regulator arranged in voltage controller, the voltage perturbation set point that the reactive power that converter exports can be compensated as required, be input in micro-capacitance sensor, keep the voltage stabilization in micro-capacitance sensor.

In this example, during voltage generation frequent fluctuation in micro-capacitance sensor, detect micro-capacitance sensor voltage by voltage transformer, carry out voltage effective value and amplitude calculates, form the control to micro-capacitance sensor voltage fluctuation.The output current of converter is detected by current transformer, then ABC/dq coordinate transform is utilized, three-phase current is converted to the DC Variable of micro-capacitance sensor fundamental frequency synchronous rotary, and compare with the meritorious and idle reference current that outer loop voltag/power controller obtains, again through the optimization of adaptive slicer, export the reference value of reactive current to greatest extent, also obtain the current reference value of corresponding active power simultaneously, two phase voltages are obtained again via inner ring Current Control, through PWM generator, control power electronics main circuit and export corresponding alternating voltage, the DC voltage of power electronics main circuit is exactly the voltage that large-scale energy storage device exports.By to the power conversion in large-scale energy storage device, regulate and control the reactive power compensation amount to micro-capacitance sensor, and then play the effect of stable micro-capacitance sensor voltage.

The effect of simulation example to above-mentioned micro-capacitance sensor voltage perturbation control system controlled with a micro-capacitance sensor voltage perturbation is below described, the general frame figure of control system as shown in Figure 7, as shown in Figure 8, it is the micro-capacitance sensor structure chart of perturbation device with voltage, under the blower fan in Fig. 8 is incorporated to suddenly micro-capacitance sensor or short-circuit conditions appears in a certain load, all can cause the fluctuation of micro-capacitance sensor voltage.In this example, the AC power of emulation uses three-phase alternating current programmable power supply model, and arranging line voltage is 0.4kV, and frequency is 50Hz.During emulation, micro-capacitance sensor voltage fluctuation: raise 1.06 times for rated value when 0.2s, 0.94 times of rated value is reduced to when 0.3s, rated value is returned to again when 0.4s, concrete simulation result is as shown in Fig. 9 to 14, wherein abscissa representing time, unit is s, and ordinate represents the rising multiple relative to rated value.

Wherein, the phase voltage waveform that when Fig. 9 and Figure 10 is voltage ripple of power network, voltage perturbation device correspondence exports and phase current waveform, as can be seen from Figure 10, voltage perturbation device neither consumes active power also not consume reactive power under normal circumstances, and electric current is zero substantially, when there is fluctuation in micro-capacitance sensor voltage, voltage perturbation device can produce reactive current rapidly, and before and after 0.3s, reactive current flows to and changes, and current phase can carry out transition rapidly reposefully, impact very little.

Figure 11 and Figure 12 is the grid voltage amplitude waveform compensating front and back, and as can be seen from Figure 12, after compensating, the amplitude of variation of voltage magnitude significantly reduces than the amplitude compensating front voltage magnitude change, can substantially maintain rated voltage constant after compensation.Figure 13 and 14 is active power and the reactive power of voltage perturbation device, active power reduces meritorious output at jump of reactive power and under the effect of adaptive slicer, and then the reactive power of output is maximized, after line voltage fluctuates, voltage perturbation device is made a response rapidly, produce corresponding reactive power, thus make micro-capacitance sensor voltage wave kinetic energy quickly recover to rated value.

The fundamental diagram of voltage perturbed system as shown in figure 15, system with TMS320F28335 digital signal processor for key control unit, have A/D sampling module, main program module, serial communication modular, PWM generation module etc., when system works, sampling modulate circuit is by the three-phase voltage in micro-capacitance sensor and current-mode analog quantity signal, convert DSP (Digital Signal Process to, Digital Signal Processing) receptible digital quantity signal, then the I/O pin of DSP is delivered to, DSP samples to input signal, filtering, correct, obtain the numerical value corresponding with analog signal, system control program calculates corresponding controlled quentity controlled variable according to sampled result and control method and exports.FPGA (Field-Programmable Gate Array, field programmable gate array) after the output variable receiving outer shroud control and interior ring controller, generate pwm pulse signal, and then control drive circuit output, main circuit is exported, control the voltage fluctuation in micro-capacitance sensor, micro-capacitance sensor voltage stabilization is run.Concrete, A/D can adopt AD7656, and DSP can adopt TMS320F28335, and RAM can adopt IS61LV51216-12T, and FPGA can adopt XC6SLX45-3CSG324I, and PWM can adopt SKYPER32.

In this example, carry out micro-capacitance sensor voltage perturbation control method based on above-mentioned voltage perturbed system can as shown in figure 16, comprise the following steps:

Step 1601: detect the three-phase current that power converter cells exports;

Step 1602: described three-phase current is converted to the DC Variable of micro-capacitance sensor fundamental frequency synchronous rotary;

Step 1603: obtain the active current reference value that power controller exports, and the reactive power reference qref that voltage controller exports;

Step 1604: described DC Variable and described active current reference value and described reactive power reference qref are compared, obtains comparative result;

Step 1605: be optimized through adaptive slicer by described comparative result, exports meritorious reference current and idle reference current to greatest extent;

Step 1606: by current controller, the meritorious reference current export to greatest extent described adaptive slicer and idle reference current, carry out control and obtain two-phase voltage control signal;

Step 1607: PWM is carried out to described two-phase voltage control signal and obtains PWM waveform, and by power converter cells described in described PWM Waveform Input.

During concrete enforcement, in above-mentioned steps 1605, can be optimized according to following amplitude limit condition:

$\sqrt{i_{\mathrm{dlim}}^{*2}+i_{\mathrm{qlim}}^{*2}}=1.5i_e$

Wherein, represent meritorious reference current amplitude limit value, represent idle reference current amplitude limit value, the idle reference current that adaptive slicer exports to greatest extent, ie represents the rated value of micro-capacitance sensor side alternating current;

The meritorious reference current exported to greatest extent and idle reference current are:

$i_d^{*}=\left\{\begin{array}{cc}{i}_{d1}^{*},& i_{\mathrm{dlim}}^{*}<i_{d1}^{*}\&le;\sqrt{i_{\lim }^{*2}-i_{q1}^{*2}}\\ \sqrt{i_{\lim }^{*2}-i_{q1}^{*2}},& \sqrt{i_{\lim }^{*2}-i_{q1}^{*2}}<i_{d1}^{*}<i_{\lim }^{*}\\ i_{\lim }^{*},& i_{d1}^{*}\&GreaterEqual;i_{\lim }^{*}\\ i_{\mathrm{dlim}}^{*},& i_{d1}^{*}\&le;i_{\mathrm{dlim}}^{*}\end{array}\right.$

$i_q^{*}=\left\{\begin{array}{cc}{i}_{q1}^{*},& -i_{\lim }^{*}<i_{q1}^{*}<i_{\lim }^{*}\\ i_{\lim }^{*},& i_{q1}^{*}\&GreaterEqual;i_{\lim }^{*}\\ -i_{\lim }^{*},& i_{q1}^{*}\&le;-i_{\lim }^{*}\end{array}\right.$

Wherein, represent the active current reference value that power controller exports, represent the reactive power reference qref that voltage controller exports.

In above-mentioned steps 1602 with the DC Variable of micro-capacitance sensor fundamental frequency synchronous rotary, can comprise: active current feedback, reactive current feedback and active power, concrete, the meritorious reference current exported to greatest extent described adaptive slicer by current controller and idle reference current are carried out control and obtain two-phase voltage control signal, can comprise:

Two-phase voltage control signal is obtained according to following transfer function:

$\left\{\begin{array}{c}{v}_d=(K_P+\frac{K_I}{s})(i_d^{*}-i_d)-\mathrm{\&omega;}{\mathrm{Li}}_q+U_m\\ v_q=(K_P+\frac{K_I}{s})(i_q^{*}-i_q)+\mathrm{\&omega;}{\mathrm{Li}}_d\end{array}\right.$

Wherein, v _dand v _qrepresent two-phase voltage control signal, K _prepresent the proportionality coefficient of PI controller, K _irepresent the integral coefficient of PI controller, i _drepresent active current feedback, i _qrepresent reactive current feedback, L represents the inductance value of inductance, and ω represents the angular frequency of micro-capacitance sensor voltage, U _mrepresent the amplitude of micro-capacitance sensor phase voltage, s represents complex variable.

In the above-described embodiments, consider in the existing micro-capacitance sensor formed with wind power generation and solar power generation just, the frequent voltage fluctuation of frequent appearance (namely, voltage perturbs) thus cause micro-capacitance sensor cannot independent operating, also cannot be incorporated in bulk power grid simultaneously and run, propose and add large-scale energy storage device in micro-capacitance sensor, the integration of formation wind-light storage, by voltage perturbation device and control method, by the energy in large-scale energy storage device according to voltage fluctuation nargin and frequency in micro-capacitance sensor, change into quadergy required in micro-capacitance sensor in real time, thus ensure micro-capacitance sensor voltage stabilization and safe and reliable operation.Further, a kind of adaptive slicer is embedded in power electronic equipment, form micro-capacitance sensor voltage perturbation control device, this adaptive slicer can produce voltage fluctuation in micro-capacitance sensor, even produce Voltage Drop during fault, under the support of large-scale energy storage device, the idle reference current exported according to the outer ring controller of power carrys out dynamic conditioning and to gain merit the amplitude limit value of reference current, the idle reference current of output is maximized, finally can recover the stable of voltage on line side more quickly, thus effectively control the voltage perturbation in micro-capacitance sensor.

From above description, can find out, the utility model embodiment achieves following technique effect: provide a kind of micro-capacitance sensor voltage perturbation control system, when there is frequent fluctuation in voltage in micro-capacitance sensor, by detecting the voltage and current in micro-capacitance sensor, applied voltage controls perturbation device, make the reactive current that the power conversion in extensive energy-storage units becomes to stablize in micro-capacitance sensor, transient voltage is enable to return to normal level, simultaneously by adding adaptive slicer, enable micro-capacitance sensor voltage when wide fluctuations, be stabilized in normal level quickly, thus ensure that the safe and reliable operation of micro-capacitance sensor, the utility model to solve in prior art voltage frequent fluctuation and reactive power in micro-capacitance sensor to be difficult to optimize the technical problem of distributing, reach the voltage fluctuation effectively suppressing micro-capacitance sensor, ensure the technique effect that voltage stabilization runs.

The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model embodiment can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.

Claims (6)

1. a micro-capacitance sensor voltage perturbation control system, is characterized in that, comprising: energy-storage units, power converter cells, coordinate transform and active power calculate unit, power controller, voltage controller, adaptive slicer, current controller, PWM generator;

Wherein, described energy-storage units, for powering for micro-capacitance sensor;

Described power converter cells, is connected with the output of described energy-storage units, outputs current to for what regulate described energy-storage units the reactive current demand meeting described micro-capacitance sensor;

Described coordinate transform and active power calculate unit, input is connected with the output of described power converter cells, variable transitions on the ABC coordinate system described power converter cells exported is to the variable on rotating coordinate system dq, wherein, the output of described coordinate transform and active power calculating unit comprises: active current feedback output end, reactive current feedback output end and active power output;

Described power controller, input is connected with active power reference value, and is connected with the active power output that described coordinate transform and active power calculate unit, and output comprises: active current reference value output;

Described voltage controller, input is connected with micro-capacitance sensor voltage reference value with micro-capacitance sensor voltage, and output comprises: reactive current reference value output;

Described adaptive slicer, input is connected with the reactive current reference value output of described voltage controller with the active current reference value output of described power controller, the reactive current reference value exported for the active current reference value that exports described power controller and described voltage controller carries out amplitude limit, exports meritorious reference current and idle reference current;

Described current controller, input is connected with the output of described adaptivity amplitude limiter, and be connected with reactive current feedback output end with the active current feedback output end that described coordinate transform and active power calculate unit, for regulating the active current of micro-capacitance sensor and reactive current, enable active current and reactive current follow the tracks of described meritorious reference current and idle reference current, what the output of described current controller exported is voltage control signal;

Described PWM generator, is connected with the output of described current controller, produces PWM waveform, input in described power converter cells for carrying out PWM to described voltage control signal.

2. micro-capacitance sensor voltage perturbation control system as claimed in claim 1, it is characterized in that, described adaptive slicer comprises: active current amplitude limiter circuit, reactive current amplitude limiter circuit, first square for the treatment of circuit, second square for the treatment of circuit, summation circuit, extraction of square root treatment circuit, circuit of minimizing, wherein:

The input of described active current amplitude limiter circuit is connected with the active current reference value output of described power controller, and the output of described active current amplitude limiter circuit is connected with the first input end of described circuit of minimizing;

The input of described reactive current amplitude limiter circuit is connected with the reactive current reference value output of described voltage controller, and the output of described reactive current amplitude limiter circuit is the idle reference current output of described adaptive slicer;

The reference current amplitude limit value being input as the output of described power converter cells of described first square for the treatment of circuit, the output of described first square for the treatment of circuit and being connected on the occasion of input of described summation circuit;

The input of described second square for the treatment of circuit is connected with the reactive current reference value output of described voltage controller, and the output of described second square for the treatment of circuit is connected with the negative value input of described summation circuit;

The output of described summation circuit is connected with the input of described extraction of square root treatment circuit, and the output of described extraction of square root treatment circuit is connected with the second output of described circuit of minimizing;

The output of described circuit of minimizing is the meritorious reference current output of described adaptive slicer.

3. micro-capacitance sensor voltage perturbation control system as claimed in claim 1, it is characterized in that, described power converter cells comprises:

Three-phase inverter, the energy of required compensation during for being the perturbation of micro-capacitance sensor voltage by the energy conversion of described energy-storage units;

Filter reactance, is connected with described three-phase inverter, is converted to the high order harmonic component produced when micro-capacitance sensor exchanges reactive power for the direct current power in energy-storage units described in filtering.

4. micro-capacitance sensor voltage perturbation control system as claimed in claim 3, it is characterized in that, described three-phase inverter comprises: under controlling at PWM, direct current energy is transformed to AC energy.

5. micro-capacitance sensor voltage perturbation control system as claimed in claim 3, is characterized in that:

Be provided with the first pi regulator in described power controller, described first pi regulator is used for the set value of the power compensated needed for the active power that exported by described three-phase inverter, is input in described micro-capacitance sensor;

Be provided with the second pi regulator in described voltage controller, described second pi regulator is used for the voltage perturbation set point compensated needed for the reactive power that exported by described three-phase inverter, is input in described micro-capacitance sensor.

6. micro-capacitance sensor voltage perturbation control system as claimed in claim 1, is characterized in that, described PWM generator also for interlocking the two-way drive singal on the same brachium pontis of main circuit, electrical isolation and power amplification.