CN102299525B - Hybrid control device for grid-connected photovoltaic power generating system and control method of hybrid control device - Google Patents
Hybrid control device for grid-connected photovoltaic power generating system and control method of hybrid control device Download PDFInfo
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- CN102299525B CN102299525B CN2011102659170A CN201110265917A CN102299525B CN 102299525 B CN102299525 B CN 102299525B CN 2011102659170 A CN2011102659170 A CN 2011102659170A CN 201110265917 A CN201110265917 A CN 201110265917A CN 102299525 B CN102299525 B CN 102299525B
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Abstract
The invention relates to a hybrid control device for a grid-connected photovoltaic power generating system. The hybrid control device comprises at least two groups of voltage sampling circuits, at least three groups of current sampling circuits, a double-channel analog/digital (A/D) conversion module, a driving circuit, a protection circuit, a control unit, a display unit, a three-channel A/D conversion module, an add and subtract operation circuit and a harmonic and reactive current detection module. The control method of the hybrid control device comprises the following steps of: analyzing a working mode, setting a conversion condition, adopting a control strategy, and performing switching detection. The device and the method have the advantages that: the control accuracy of a converter is improved, the failure rate is reduced, the device has a simple structure, the method is feasible, and the utilization rate of the whole grid-connected photovoltaic power generating system can be improved.
Description
(1) technical field:
The present invention relates to photovoltaic generation and blend together the control theory field, especially a kind of grid-connected photovoltaic power generation system blend together control device and control method thereof.
(2) background technology:
With photovoltaic effect, utilize solar energy to be generated electricity, be widely applied in nearly decades, be regarded as a kind of form that effectively utilizes solar energy.At present, China at the photovoltaic plant of building and building up in ascendant trend.But, photovoltaic cell only could produce electric energy having under the condition of illumination, do not having under the condition of illumination, whole grid-connected photovoltaic system is substantially in idle state, yet, along with the continuous increase of photovoltaic plant capacity, how more to effectively utilize grid-connected photovoltaic power generation system and more and more be subject to people's attention.From grid-connected photovoltaic system structure chart (accompanying drawing 1), can find out, if by inverter left side equivalence one-tenth direct voltage source or by C
1left part is removed, and its system configuration is the same with STATCOM or APF, and system configuration determines its range of application.Therefore, literary composition of the present invention is as starting point, takes the control strategy of harmonic wave, idle, active current on photovoltaic DC-to-AC converter is controlled.Having under the condition of illumination, grid-connected photovoltaic power generation system can provide meritorious to electrical network; Do not having under the condition of illumination, system can provide idle and suppress harmonic current for electrical network, improves the quality of power supply.Like this, can improve the utilance of whole grid-connected photovoltaic power generation system, increase economic benefit.
(3) summary of the invention:
What the object of the present invention is to provide a kind of grid-connected photovoltaic power generation system blendes together control device and control method thereof, it can overcome the deficiencies in the prior art, that the Finite State Machine that a kind of utilization blendes together in control theory is divided the operating state of grid-connected photovoltaic power generation system, illumination condition and unglazed according to taking respectively different sub-control systems to be controlled under condition is being arranged, improve the utilance of whole grid-connected photovoltaic power generation system, it is simple in structure, easy to implement the method.
Technical scheme of the present invention: a kind of grid-connected photovoltaic power generation system blend together control device, comprise the photovoltaic generating system that contains photovoltaic array, device for power switching, transformer and electrical network, it is characterized in that it comprises at least two group voltage sampling circuits, at least three group current sampling circuits, double channel A/D modular converter, drive circuit and protective circuit, control unit, display unit, triple channel A/D modular converter, addition and subtraction circuit and harmonic wave and Detecting Reactive Current module; The input of described one group of voltage sampling circuit and one group of current sampling circuit gathers output voltage and the electric current of photovoltaic system, and its output connects the input of double channel A/D modular converter; The input of described control unit connects the output of double channel A/D modular converter and the output of triple channel A/D modular converter, and its output connects drive circuit and the input of protective circuit and the input of display module; The output of described drive circuit and protective circuit passes the signal in the device for power switching in photovoltaic system; The input of described triple channel A/D modular converter connects the output of addition and subtraction circuit; The input of described addition and subtraction circuit connects another output of organizing the current sampling circuit that gathers transformer inlet side current signal and the output of harmonic wave and Detecting Reactive Current module; The input of described harmonic wave and Detecting Reactive Current module is connected the collection transformer and goes out another group voltage sampling circuit of terminal voltage current signal and the output of the 3rd group of current sampling circuit.
Described voltage sampling circuit consists of voltage transformer pt, resistance R 15, resistance R 11, resistance R 12, resistance R 13, resistance R 14, capacitor C 11, capacitor C 12, diode D11, diode D12, inductance L 11 and inductance L 12; It is connected to conventional the connection.
Described current sampling circuit consists of voltage transformer CT, resistance R 25, resistance R 21, resistance R 22, resistance R 23, resistance R 24, capacitor C 21, capacitor C 22, diode D21, diode D22, inductance L 21 and inductance L 22; It is connected to conventional the connection.
Described control unit consists of dsp chip, singlechip chip and CY7C136 chip, the input of described dsp chip connects the output of double channel A/D modular converter and the output of triple channel A/D modular converter, its output connects the input of drive circuit and protective circuit, is two-way with singlechip chip and is connected simultaneously; The output of described singlechip chip connects the input of display module.
Described dsp chip adopts the TMS320F206DSP chip, and described singlechip chip adopts the P89V51RD2 chip.
Described drive circuit and protective circuit are comprised of photoelectric isolating circuit and power amplification circuit, and it is connected to conventional the connection.
A kind of control method that blendes together control device of grid-connected photovoltaic power generation system is characterized in that comprising the following steps:
(1) analyze the mode of operation of grid-connected photovoltaic power generation system, draw the number of mode of operation; In the situation that illumination is arranged, photovoltaic array has the output of electric energy, to electrical network, provides electric energy, and this mode of operation is called to subpattern 1; Do not having under the condition of illumination, photovoltaic array does not have the output of electric energy, but takes to control for grid-connected photovoltaic system now, makes it to electrical network, provide idle and suppress harmonic current, and this mode of operation is referred to as subpattern 2;
(2) have or not the output of electric energy according to photovoltaic array, whether the output of photovoltaic array electric energy is relevant with intensity of illumination, sets two kinds of switch conditions between mode of operation, that is: as intensity of illumination S>=0.1Kw/m
2the time and photovoltaic array electric energy output is arranged, system works is in subpattern 1, as intensity of illumination S<0.1Kw/m
2the time, photovoltaic array does not have the output of electric energy, and the system works pattern is switched to mode of operation 2, and vice versa;
(3) in subpattern, take for 1 time grid-connected photovoltaic system that the sub-control strategy 1 of active energy is provided to system, in subpattern, take for 2 times grid-connected photovoltaic system to provide sub-control strategy 2 idle and the inhibition harmonic current to system;
(4) utilize the finite state machine blended together in control theory to realize the switching of sub-control strategy.
What the sub-control strategy 1 in described step (3) was taked is the Double closed-loop of voltage and current strategy, and sub-control strategy 2 is taked is based on the control strategy that instantaneous reactive power theory detects reactive current and harmonic current.
Superiority of the present invention is: utilize the Finite State Machine blended together in control theory to be divided the operating state of grid-connected photovoltaic power generation system; illumination condition and unglazed according to taking respectively different sub-control systems to be controlled under condition is being arranged; in conjunction with high performance dsp chip; by drive circuit and protective circuit, realize controlling; improve the control precision of converter, reduce failure rate.Simultaneously by select single-chip microcomputer P89V51RD2 to carry out processes and displays and with external equipment communication etc. to alleviate the burden of DSP, improve the utilance of whole grid-connected photovoltaic power generation system.
(4) accompanying drawing explanation:
The overall structure schematic diagram that blendes together control device that Fig. 1 is the related a kind of grid-connected photovoltaic power generation system of the present invention;
The voltage sampling circuit structural representation in control device that blendes together that Fig. 2 is the related a kind of grid-connected photovoltaic power generation system of the present invention;
The current sampling circuit structural representation in control device that blendes together that Fig. 3 is the related a kind of grid-connected photovoltaic power generation system of the present invention;
Single-chip microcomputer and the DSP connection diagram in control device of blending together that Fig. 4 is the related a kind of grid-connected photovoltaic power generation system of the present invention;
Drive circuit and the protective circuit structural representation in control device of blending together that Fig. 5 is the related a kind of grid-connected photovoltaic power generation system of the present invention;
The Double closed-loop of voltage and current policy construction figure in the control device control method that blendes together that Fig. 6 is the related a kind of grid-connected photovoltaic power generation system of the present invention;
Idle in the control device control method and the harmonic wave current detecting control strategy structure chart of blending together that Fig. 7 is the related a kind of grid-connected photovoltaic power generation system of the present invention;
The finite state machine schematic diagram based on blending together control theory in the control device control method that blendes together that Fig. 8 is the related a kind of grid-connected photovoltaic power generation system of the present invention.
(5) embodiment:
Embodiment: a kind of grid-connected photovoltaic power generation system blend together control device (seeing Fig. 1), comprise the photovoltaic generating system that contains photovoltaic array, device for power switching, transformer and electrical network, it is characterized in that it is by least two group voltage sampling circuits, at least three group current sampling circuits, double channel A/D modular converter, drive circuit and protective circuit, control unit, display unit, triple channel A/D modular converter, addition and subtraction circuit and harmonic wave and Detecting Reactive Current module composition; The input of described one group of voltage sampling circuit and one group of current sampling circuit gathers output voltage and the electric current of photovoltaic system, and its output connects the input of double channel A/D modular converter; The input of described control unit connects the output of double channel A/D modular converter and the output of triple channel A/D modular converter, and its output connects drive circuit and the input of protective circuit and the input of display module; The output of described drive circuit and protective circuit passes the signal in the device for power switching in photovoltaic system; The input of described triple channel A/D modular converter connects the output of addition and subtraction circuit; The input of described addition and subtraction circuit connects another output of organizing the current sampling circuit that gathers transformer inlet side current signal and the output of harmonic wave and Detecting Reactive Current module; The input of described harmonic wave and Detecting Reactive Current module is connected the collection transformer and goes out another group voltage sampling circuit of terminal voltage current signal and the output of the 3rd group of current sampling circuit.
Described voltage sampling circuit (seeing Fig. 2) consists of voltage transformer pt, resistance R 15, resistance R 11, resistance R 12, resistance R 13, resistance R 14, capacitor C 11, capacitor C 12, diode D11, diode D12, inductance L 11 and inductance L 12; It is connected to conventional the connection.
Described current sampling circuit (seeing Fig. 3) consists of voltage transformer CT, resistance R 25, resistance R 21, resistance R 22, resistance R 23, resistance R 24, capacitor C 21, capacitor C 22, diode D21, diode D22, inductance L 21 and inductance L 22; It is connected to conventional the connection.
Described control unit (seeing Fig. 4) consists of dsp chip, singlechip chip and CY7C136 chip, the input of described dsp chip connects the output of double channel A/D modular converter and the output of triple channel A/D modular converter, its output connects the input of drive circuit and protective circuit, is two-way with singlechip chip and is connected simultaneously; The output of described singlechip chip connects the input of display module.
Described dsp chip (seeing Fig. 4) adopts the TMS320F206DSP chip, and described singlechip chip adopts the P89V51RD2 chip.
Described drive circuit and protective circuit (seeing Fig. 5) are comprised of photoelectric isolating circuit and power amplification circuit, and it is connected to conventional the connection.
A kind of control method that blendes together control device of grid-connected photovoltaic power generation system (seeing Fig. 6, Fig. 7, Fig. 8) is characterized in that comprising the following steps:
(1) analyze the mode of operation of grid-connected photovoltaic power generation system, draw the number of mode of operation; In the situation that illumination is arranged, photovoltaic array has the output of electric energy, to electrical network, provides electric energy, and this mode of operation is called to subpattern 1; Do not having under the condition of illumination, photovoltaic array does not have the output of electric energy, but takes to control for grid-connected photovoltaic system now, makes it to electrical network, provide idle and suppress harmonic current, and this mode of operation is referred to as subpattern 2;
(2) have or not the output of electric energy according to photovoltaic array, whether the output of photovoltaic array electric energy is relevant with intensity of illumination, sets two kinds of switch conditions between mode of operation, that is: as intensity of illumination S>=0.1Kw/m
2the time and photovoltaic array electric energy output is arranged, system works is in subpattern 1, as intensity of illumination S<0.1Kw/m
2the time, photovoltaic array does not have the output of electric energy, and the system works pattern is switched to mode of operation 2, and vice versa;
(3) in subpattern, take for 1 time grid-connected photovoltaic system that the sub-control strategy 1 of active energy is provided to system, in subpattern, take for 2 times grid-connected photovoltaic system to provide sub-control strategy 2 idle and the inhibition harmonic current to system;
(4) utilize the finite state machine blended together in control theory to realize the switching (seeing Fig. 8) of sub-control strategy.
What the sub-control strategy 1 in described step (3) was taked is Double closed-loop of voltage and current strategy (seeing Fig. 6), and sub-control strategy 2 is taked is based on the control strategy that instantaneous reactive power theory detects reactive current and harmonic current.
Claims (5)
1. grid-connected photovoltaic power generation system blendes together control device, comprise the photovoltaic generating system that contains photovoltaic array, device for power switching, transformer and electrical network, it comprises at least two group voltage sampling circuits, at least three group current sampling circuits, double channel A/D modular converter, drive circuit and protective circuit, control unit, display module, triple channel A/D modular converter, addition and subtraction circuit and harmonic wave and Detecting Reactive Current module; The input of one group of voltage sampling circuit and one group of current sampling circuit gathers output voltage and the electric current of photovoltaic array, and its output connects the input of double channel A/D modular converter; The input of described control unit connects the output of double channel A/D modular converter and the output of triple channel A/D modular converter, and its output connects drive circuit and the input of protective circuit and the input of display module; The output of described drive circuit and protective circuit passes the signal in the device for power switching in grid-connected photovoltaic power generation system; The input of described triple channel A/D modular converter connects the output of addition and subtraction circuit; The input of described addition and subtraction circuit connects the output of second group of current sampling circuit that gathers transformer inlet side current signal and the output of harmonic wave and Detecting Reactive Current module; The input of described harmonic wave and Detecting Reactive Current module is connected the collection transformer and goes out second group of voltage sampling circuit of terminal voltage current signal and the output of the 3rd group of current sampling circuit; It is characterized in that this control method that blendes together control device comprises the following steps:
(1) analyze the mode of operation of grid-connected photovoltaic power generation system, draw the number of mode of operation; In the situation that illumination is arranged, photovoltaic array has the output of electric energy, to electrical network, provides electric energy, and this mode of operation is called to subpattern 1; Do not having under the condition of illumination, photovoltaic array does not have the output of electric energy, but takes to control for grid-connected photovoltaic power generation system now, makes it to electrical network, provide idle and suppress harmonic current, and this mode of operation is referred to as subpattern 2;
(2) have or not the output of electric energy according to photovoltaic array, whether the output of photovoltaic array electric energy is relevant with intensity of illumination, sets two kinds of switch conditions between mode of operation, that is: as intensity of illumination S>=0.1Kw/m
2the time and photovoltaic array electric energy output is arranged, system works is in subpattern 1, as intensity of illumination S<0.1Kw/m
2the time, photovoltaic array does not have the output of electric energy, and the system works pattern is switched to mode of operation 2, and vice versa;
(3) in subpattern, take for 1 time grid-connected photovoltaic power generation system that the sub-control strategy 1 of active energy is provided to system, in subpattern, take for 2 times grid-connected photovoltaic power generation system to provide sub-control strategy 2 idle and the inhibition harmonic current to system;
(4) utilize the finite state machine blended together in control theory to realize the switching of sub-control strategy.
2. according to the control device that blendes together of grid-connected photovoltaic power generation system described in claim 1, it is characterized in that described control unit consists of dsp chip, singlechip chip and CY7C136 chip, the input of described dsp chip connects the output of double channel A/D modular converter and the output of triple channel A/D modular converter, its output connects the input of drive circuit and protective circuit, is two-way with singlechip chip and is connected simultaneously; The output of described singlechip chip connects the input of display module.
3. according to the control device that blendes together of grid-connected photovoltaic power generation system described in claim 2, it is characterized in that described dsp chip adopts the TMS320F206 dsp chip, described singlechip chip adopts the P89V51RD2 chip.
4. the control method that blendes together control device of grid-connected photovoltaic power generation system according to claim 1 is characterized in that comprising the following steps:
(1) analyze the mode of operation of grid-connected photovoltaic power generation system, draw the number of mode of operation; In the situation that illumination is arranged, photovoltaic array has the output of electric energy, to electrical network, provides electric energy, and this mode of operation is called to subpattern 1; Do not having under the condition of illumination, photovoltaic array does not have the output of electric energy, but takes to control for grid-connected photovoltaic power generation system now, makes it to electrical network, provide idle and suppress harmonic current, and this mode of operation is referred to as subpattern 2;
(2) have or not the output of electric energy according to photovoltaic array, whether the output of photovoltaic array electric energy is relevant with intensity of illumination, sets two kinds of switch conditions between mode of operation, that is: as intensity of illumination S>=0.1Kw/m
2the time and photovoltaic array electric energy output is arranged, system works is in subpattern 1, as intensity of illumination S<0.1Kw/m
2the time, photovoltaic array does not have the output of electric energy, and the system works pattern is switched to mode of operation 2, and vice versa;
(3) in subpattern, take for 1 time grid-connected photovoltaic power generation system that the sub-control strategy 1 of active energy is provided to system, in subpattern, take for 2 times grid-connected photovoltaic power generation system to provide sub-control strategy 2 idle and the inhibition harmonic current to system;
(4) utilize the finite state machine blended together in control theory to realize the switching of sub-control strategy.
5. according to the control method that blendes together control device of grid-connected photovoltaic power generation system described in claim 4, what it is characterized in that sub-control strategy 1 in described step (3) takes is the Double closed-loop of voltage and current strategy, and sub-control strategy 2 is taked is based on the control strategy that instantaneous reactive power theory detects reactive current and harmonic current.
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| CN102890735B (en) * | 2012-07-09 | 2014-11-05 | 南京南瑞继保电气有限公司 | Modeling method of strategy table and strategy table searching match of stable control device |
| CN104734145B (en) * | 2013-12-24 | 2017-07-04 | 长沙理工大学 | Based on the micro-grid connection control method for blending together hierarchical structure model |
| CN104753080A (en) * | 2013-12-30 | 2015-07-01 | 长沙理工大学 | Single-phase photovoltaic power supply grid-connected inverter hybrid automata control method |
| CN104750161B (en) * | 2013-12-30 | 2017-01-11 | 长沙理工大学 | Hybrid automata method for photovoltaic array output maximum power tracking control |
| CN104218838A (en) * | 2014-07-30 | 2014-12-17 | 新疆荣信节能电气有限公司 | Photovoltaic grid-connected inverter with function of adaptive harmonic in-place control |
| CN106681424B (en) * | 2016-12-08 | 2018-04-10 | 苏州市职业大学 | A kind of solar energy power generating MPPT control systems and control method |
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