CN101494385A - Solar photovoltaic parallel inverter control system based on LCL filtering - Google Patents
Solar photovoltaic parallel inverter control system based on LCL filtering Download PDFInfo
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- CN101494385A CN101494385A CNA2009100250896A CN200910025089A CN101494385A CN 101494385 A CN101494385 A CN 101494385A CN A2009100250896 A CNA2009100250896 A CN A2009100250896A CN 200910025089 A CN200910025089 A CN 200910025089A CN 101494385 A CN101494385 A CN 101494385A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
A solar energy grid-connected inverter control system based on LCL filtration comprises a photovoltaic array, an electromagnetic interference filter, namely an EMI filter, a power module, an LCL filter, an isolation transformator TB1, a sample circuit, a filter circuit and a controller which includes a maximum capacity tracking MPPT unit. MPPT adopts an intelligent algorithm based on a hybrid algorithm of a simulated annealing method and a genetic algorithm. The hybrid optimization algorithm takes the operation process of the genetic algorithm as the main process and also combines a simulated annealing mechanism that is used for further adjusting optimized instruction data. The control system has the advantages of good stability, strong performance and high efficiency and reliability.
Description
Technical field
The present invention relates to the clean energy resource field that generates electricity by way of merging two or more grid systems, particularly a kind of inverter that is used for solar grid-connected generating, specifically a kind of solar photovoltaic parallel inverter control system based on LCL filtering.
Background technology
Along with a large amount of dischargings of greenhouse gas, the continuous aggravation of greenhouse effect, our lazyness constantly worsens with the earth environment of surviving, and adds energy crisis, and it is extremely urgent adopting clean energy resource to substitute traditional energy.In recent years, the photovoltaic cell development of technology, the efficient of solar energy power generating is improved constantly, cost constantly reduces, therefore adopt solar energy power generating to substitute the first-selection of the many countries of traditional energy generating becoming, China's solar energy resources is abundant, the whole nation 2/3rds sunshine hour in area year number more than 2200 hours, the desert area is big, has the great potential of development solar energy.Solar energy utilizes the process cleaning, can effectively reduce the discharging of greenhouse gas, is the most potential regenerative resource.
Photovoltaic DC-to-AC converter is divided into " from the net type " and " grid type " two kinds, and " from the net type " photovoltaic DC-to-AC converter is mainly used in the area of electricity consumption difficulty such as remote mountain areas, mainly solves the need of life; The photovoltaic DC-to-AC converter of " grid type " claims current transformer that electric energy is directly sent into public electric wire net again, has great potential.Yet, the poor reliability of current photovoltaic combining inverter, stability is weak, efficient is low, all there is deficiency in aspects such as ceiling capacity tracking, current harmonics and power factor, and the stability of whole solar photovoltaic parallel inverter control system and reliability are not high, can not satisfy the needs of existing development.
Summary of the invention
The objective of the invention is that poor stability, performance at existing photovoltaic generating system is bad, efficient is low, the problem that reliability is not high, propose that a kind of employing LCL stability of filter is good, performance is strong, efficient is high, the solar photovoltaic parallel inverter control system based on LCL filtering that reliability is big.
Technical scheme of the present invention is:
A kind of solar photovoltaic parallel inverter control system based on LCL filtering, it comprises photovoltaic array, Electromagnetic interference filter is an electromagnetic interface filter, power model, the LCL filter, isolating transformer TB1, sample circuit, filter circuit and controller, photovoltaic array absorbs solar energy, and light signal is converted to the signal of telecommunication, the output of photovoltaic array connects the corresponding input end of electromagnetic interface filter, the corresponding input end of the output termination power model of electromagnetic interface filter, the signal output part of power model connects the input of LCL filter, the input of the output termination isolating transformer TB1 of LCL filter, the output of isolating transformer TB1 gets access to grid, the output of photovoltaic array links to each other with the signal input part of sample circuit, the signal output part of sample circuit connects the signal input part of filter circuit, the signal output part of filter circuit connects the respective signal input of controller, another signal input part of controller connects the signal output part of electromagnetic interface filter, and the signal output part conduct of controller connects the corresponding controlled terminal of power model based on the output of the solar photovoltaic parallel inverter control system of LCL filtering.
Power model of the present invention comprises capacitor C 1 and insulated gate bipolar transistor T1-T6, the two ends of capacitor C 1 are attempted by the two ends of electromagnetic interface filter as the input of power model, series connection insulated gate bipolar transistor T1, T2, series connection insulated gate bipolar transistor T3, T4 and series connection insulated gate bipolar transistor T5, T6 all are attempted by the two ends of capacitor C 1.
LCL filter of the present invention comprises inductance L 1-L6, resistance R L1-RL3 and capacitor C 2-C4, series inductance L1, L2, series inductance L3, L4 and series inductance L5, the end of L6 respectively with insulated gate bipolar transistor T1, the tie point of T2, insulated gate bipolar transistor T3, the tie point of T4 and insulated gate bipolar transistor T5, the tie point of T6 links to each other, series inductance L1, L2, series inductance L3, L4 and series inductance L5, the other end of L6 connects each respective signal input of isolating transformer TB1 respectively, inductance L 1, the tie point of L2, inductance L 3, the tie point of L4 and inductance L 5, the tie point of L6 meets series resistance RL1 respectively, capacitor C 2, series resistance RL2, capacitor C 3 and series resistance RL1, capacitor C 2, the non-connecting resistance end of capacitor C 2-C4 links to each other.
Beneficial effect of the present invention:
The present invention is the photovoltaic DC-to-AC converter that adopts LCL filter " grid type ", and its scientific and technological content is higher, and value-added content of product is big, substitutes the discharging of traditional energy generating can effectively minimizing greenhouse gas.
The LCL filter of the present invention resistance of in capacitive branch, having contacted, take out current and voltage signals in AC side by voltage and current sensor, the control of participation synchronizing signal, and three-phase abc electric current carried out the dq coordinate transform, adopt the modulation system of space vector pulse width modulation SVPWM, can effectively utilize direct voltage and reduce current harmonics.Solve the LCL filter and in actual motion, produce resonance, cause the problem of unstable of system
Description of drawings
Fig. 1 is a theory diagram of the present invention.
Fig. 2 is an electrical schematic diagram of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, a kind of solar photovoltaic parallel inverter control system based on LCL filtering, it comprises photovoltaic array P1, Electromagnetic interference filter is an electromagnetic interface filter, power model, the LCL filter, isolating transformer TB1, sample circuit, filter circuit and controller (can adopt the high-speed dsp controller of TI company, model can be TMS320LF2407), photovoltaic array absorbs solar energy, and be electric energy with transform light energy, the output of photovoltaic array connects the corresponding input end of electromagnetic interface filter, the corresponding input end of the output termination power model of electromagnetic interface filter, the signal input part of the output termination LCL filter of power model, the input of the output termination isolating transformer TB1 of LCL filter, the output of isolating transformer TB1 gets access to grid by switch module, the output of photovoltaic array links to each other with the signal input part of sample circuit, the signal output part of sample circuit connects the signal input part of filter circuit, the signal output part of filter circuit connects the respective signal input of controller, another signal input part of controller connects the signal output part of electromagnetic interface filter, and the signal output part conduct of controller connects the corresponding controlled terminal of power model based on the output of the solar photovoltaic parallel inverter control system of LCL filtering.
Switch module of the present invention comprises charging resistor R1-R3, charging contactor KM1, contactor KM2, circuit breaker Q A2 and exchanges electromagnetic interface filter that the output of isolating transformer TB1 is sent into electrical network by switch module.
Power model of the present invention comprises that capacitor C 1 and insulated gate bipolar transistor T1-T6 are IGBTT1-T6, the two ends of capacitor C 1 are attempted by the two ends of electromagnetic interface filter as the input of power model, series connection insulated gate bipolar transistor T1, T2, series connection insulated gate bipolar transistor T3, T4 and series connection insulated gate bipolar transistor T5, T6 all are attempted by the two ends of capacitor C 1.
LCL filter of the present invention comprises inductance L 1-L6, resistance R L1-RL3 and capacitor C 2-C4, series inductance L1, L2, series inductance L3, L4 and series inductance L5, the end of L6 respectively with insulated gate bipolar transistor T1, the tie point of T2, insulated gate bipolar transistor T3, the tie point of T4 and insulated gate bipolar transistor T5, the tie point of T6 links to each other, series inductance L1, L2, series inductance L3, L4 and series inductance L5, the other end of L6 connects each respective signal input of isolating transformer TB1 respectively, inductance L 1, the tie point of L2, inductance L 3, the tie point of L4 and inductance L 5, the tie point of L6 meets series resistance RL1 respectively, capacitor C 2, series resistance RL2, capacitor C 3 and series resistance RL1, capacitor C 2, the non-connecting resistance end of capacitor C 2-C4 links to each other.
Controller of the present invention comprise ceiling capacity follow the trail of MPPT unit, first ratio and integral controller, second ratio and integral controller, first adder, second adder, with the current i under the two-phase synchronous rotating frame
DaConvert the three-phase current i under the three phase static coordinate system to
AbcThe unit be i
Dq/ i
AbcCoordinate transformation unit and with the three-phase current i under the three phase static coordinate system
AbcConvert the current i under the two-phase synchronous rotating frame to
DqThe unit be i
Abc/ i
DqCoordinate transformation unit, the control procedure of controller may further comprise the steps:
(a). the ceiling capacity of controller is followed the trail of the voltage signal U of MPPT unit according to the photovoltaic array output of being gathered
DcWith Electromagnetic interference filter be the voltage signal U that the current signal of electromagnetic interface filter output calculates optimization
Dc *
(b). the voltage signal U of photovoltaic array output
DcWith the voltage signal U that optimizes
Dc *Voltage output signal by first adder is that first pi regulator obtains current signal i through first ratio and integral controller
q *And be sent to second adder;
(c). the output at isolating transformer TB1 is gathered three-phase current signal, with the three-phase current i under the three phase static coordinate system
AbcChange into the current i under the two-phase synchronous rotating frame
Dq, and with the active component of current i that obtains
qBe sent to the real component i of second adder and current command signal
q *Calculate, and the current signal that obtains is transferred to the current i under the two-phase synchronous rotating frame
DqConvert the three-phase current i under the three phase static coordinate system to
AbcThe unit in be i
Dq/ i
AbcCoordinate transformation unit;
(d). at i
Abc/ i
DqThe idle component i of the electric current of coordinate transformation unit output
dIdle component i with the outer ring element of the power factor of controller
d *Adding and subtracting mutually by second ratio and integral controller is that second pi regulator is delivered to i
Dq/ i
AbcCoordinate transformation unit;
(e) .i
Dq/ i
AbcThe output of coordinate transformation unit is by exporting the insulated gate bipolar transistor T1-T6 of power controlling module as control behind the space vector pulse width modulation unit.
During concrete enforcement:
As shown in Figure 2, be converted direct current via dc circuit breaker QA1 by the solar cell photovoltaic array, by entering power model after the filtering of direct current electromagnetic interface filter, power model is made up of with insulated gate bipolar transistor T1-T6 capacitor C 1, three-phase pulse width modulated PWM modulating wave becomes sinusoidal wave after by isolating transformer TB1 through the LCL filter filtering, contactor KM2, circuit breaker Q A2, exchange electromagnetic interface filter and send into electrical network, wherein the LCL filter is by inductance L 1-L6, resistance R L1-RL2, capacitor C 2-C4 forms, resistance R 1-R3 is a charging resistor, and contactor KM1 is a charging contactor.Photovoltaic array P1 is a kind of nonlinear DC source, and its power supply characteristic can be considered as the combination of a constant pressure source and constant-current source.Change with operating state, there is a maximum power point (mpp) in the power terminal voltage of photovoltaic array/current curve.Two principal elements that influence power points are intensity of illumination and array surface temperature.When implementing, need the control photovoltaic array to run near its maximum power point, make full use of power output.Go out the voltage and the electric current of photovoltaic array by sensor, through calculating power.
Employing LCL filtering can reduce the high order harmonic component composition in the electric current effectively.When being lower than resonance frequency, the LCL filter can be regarded the L filter that inductance value is 2 inductance sums as, and littler than the inductance value of L filtering, and LCL filtering can be adopted less relatively filter element, has reduced the volume of filter.In actual motion, can produce resonance at the LCL filter, the problem of unstable that causes system, the patent of the present invention resistance of in capacitive branch, having contacted, take out current and voltage signals in AC side by voltage and current sensor, the control of participation synchronizing signal, and three-phase abc electric current carried out the dq coordinate transform, and adopt space vector pulse width modulation SVPWM modulation system, can effectively utilize direct voltage and reduce current harmonics.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
Claims (3)
1, a kind of solar photovoltaic parallel inverter control system based on LCL filtering, it is characterized in that it comprises photovoltaic array, Electromagnetic interference filter is an electromagnetic interface filter, power model, the LCL filter, isolating transformer TB1, sample circuit, filter circuit and controller, photovoltaic array absorbs solar energy, and light signal is converted to the signal of telecommunication, the output of photovoltaic array connects the corresponding input end of electromagnetic interface filter, the corresponding input end of the output termination power model of electromagnetic interface filter, the input of power model output termination LCL filter, the input of the output termination isolating transformer TB1 of LCL filter, the output of isolating transformer TB1 gets access to grid, the output of photovoltaic array links to each other with the signal input part of sample circuit, the signal output part of sample circuit connects the signal input part of filter circuit, the signal output part of filter circuit connects the respective signal input of controller, another signal input part of controller connects the signal output part of electromagnetic interface filter, and the signal output part conduct of controller connects the corresponding controlled terminal of power model based on the output of the solar photovoltaic parallel inverter control system of LCL filtering.
2, according to the solar photovoltaic parallel inverter control system based on LCL filtering of claim 1, it is characterized in that described power model comprises capacitor C 1 and insulated gate bipolar transistor T1-T6, the two ends of capacitor C 1 are attempted by the two ends of electromagnetic interface filter as the input of power model, series connection insulated gate bipolar transistor T1, T2, series connection insulated gate bipolar transistor T3, T4 and series connection insulated gate bipolar transistor T5, T6 all are attempted by the two ends of capacitor C 1.
3, solar photovoltaic parallel inverter control system according to claim 1 based on LCL filtering, it is characterized in that described LCL filter comprises inductance L 1-L6, resistance R L1-RL3 and capacitor C 2-C4, series inductance L1, L2, series inductance L3, L4 and series inductance L5, the end of L6 respectively with insulated gate bipolar transistor T1, the tie point of T2, insulated gate bipolar transistor T3, the tie point of T4 and insulated gate bipolar transistor T5, the tie point of T6 links to each other, series inductance L1, L2, series inductance L3, L4 and series inductance L5, the other end of L6 connects each respective signal input of isolating transformer TB1 respectively, inductance L 1, the tie point of L2, inductance L 3, the tie point of L4 and inductance L 5, the tie point of L6 meets series resistance RL1 respectively, capacitor C 2, series resistance RL2, capacitor C 3 and series resistance RL1, capacitor C 2, the non-connecting resistance end of capacitor C 2-C4 links to each other.
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| CN101976854A (en) * | 2010-11-10 | 2011-02-16 | 江苏中澳光伏能源科技有限公司 | Photovoltaic power generation single phase grid-connected inverter |
| CN102064714A (en) * | 2010-12-02 | 2011-05-18 | 永济新时速电机电器有限责任公司 | Doubly-fed wind power frequency converter |
| CN102075108A (en) * | 2011-01-20 | 2011-05-25 | 哈尔滨工业大学 | Capacitance current feedforward control method for grid-connected inverter with LCL filter |
| CN102097824A (en) * | 2010-12-31 | 2011-06-15 | 华中科技大学 | Control method of LCL (Lower Control Limit) type grid-connected inverter for restricting influence of grid voltage on grid-connected current |
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| CN102290815A (en) * | 2011-08-22 | 2011-12-21 | 湖北三环发展股份有限公司 | APF (active power filter) based on coupling inductance |
| WO2012028589A3 (en) * | 2010-08-31 | 2012-06-07 | Sma Solar Technology Ag | Inverter with an ac interface for the connection of ac modules |
| CN102738826A (en) * | 2012-06-11 | 2012-10-17 | 合肥工业大学 | Leakage current restraining method for improved LCL (Lower Control Limit) filter and even balance control method |
| CN102832842A (en) * | 2012-08-31 | 2012-12-19 | 广东明阳龙源电力电子有限公司 | Novel three-phase photovoltaic grid-connected inverter system |
| CN102916447A (en) * | 2012-11-16 | 2013-02-06 | 哈尔滨电机厂有限责任公司 | Photovoltaic grid-connected power generation and supply device |
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| CN103887956A (en) * | 2014-04-15 | 2014-06-25 | 上海西艾爱电子有限公司 | High-voltage and large-current harmonics filter for photovoltaic inverter system |
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| CN103887956A (en) * | 2014-04-15 | 2014-06-25 | 上海西艾爱电子有限公司 | High-voltage and large-current harmonics filter for photovoltaic inverter system |
| CN104779640A (en) * | 2015-04-15 | 2015-07-15 | 上海追日电气有限公司 | System for preventing distributed power generation system from reversing electric power to power grid and control method |
| CN104852561A (en) * | 2015-04-30 | 2015-08-19 | 祥天控股（集团）有限公司 | On-grid and off-grid inversion method |
| CN105549677A (en) * | 2016-02-29 | 2016-05-04 | 西安交通大学 | Photovoltaic maximum power tracking method based on simulated annealing method |
| CN105549677B (en) * | 2016-02-29 | 2017-02-08 | 西安交通大学 | Photovoltaic maximum power tracking method based on simulated annealing method |
| CN106230288A (en) * | 2016-08-08 | 2016-12-14 | 湖州新智源电子科技有限公司 | A kind of multichannel MPPT Miniature inverter and control method thereof |
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