CN105186906B - Three-phase LCL type photovoltaic combining inverter control method - Google Patents
Three-phase LCL type photovoltaic combining inverter control method Download PDFInfo
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- CN105186906B CN105186906B CN201510299362.XA CN201510299362A CN105186906B CN 105186906 B CN105186906 B CN 105186906B CN 201510299362 A CN201510299362 A CN 201510299362A CN 105186906 B CN105186906 B CN 105186906B
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Abstract
The present invention mainly proposes a kind of improved three-phase LCL type photovoltaic combining inverter control method, it is characterised in that uses Current Voltage Three-loop control, specific as follows: the first step obtains power network current signal ia、ib、ic, synchronizing current signal is obtained by phaselocked loop and obtains the current signal i in rest frame by abc/ α β coordinate transformsα、isβ；Second step, by DC bus-bar voltage UdcWith reference value UrefDifference be sent into ratio resonant controller (PR), and in its transmission functionOn the basis of increase second order improper integral Hi(s), it obtainsThird step, the current signal of PR adjuster outputRespectively with isα、isβIt carries out plus-minus and is calculated current signal, and carry out α β/abc coordinate transform with the sum of the inner ring capacitance current signal of proportional controller (P), generate corresponding SVPWM signal control power tube.Emulation and the experimental results showed that, this method effectively improves the grid-connected current waveform of system, obtains high-quality grid-connected current.
Description
The present invention relates to a kind of three-phase LCL type photovoltaic combining inverter control methods.
Background technique
Photovoltaic power generation has many advantages, and technology also reaches its maturity.Gird-connected inverter is as photovoltaic generating system
Core link can undertake maximal power tracing, DC boosting inversion, the anti-isolated island of photovoltaic battery array in grid-connection control system
The effects of protection.LCL type photovoltaic combining inverter joined LCL type filter relative to traditional gird-connected inverter.Although it has
There is the ability for inhibiting higher hamonic wave, but increases the difficulty of its control strategy.Currently, having some documents for LCL type photovoltaic
Gird-connected inverter proposes specific control method.In 30th phase " Proceedings of the CSEE " in 2010 " LCL type is grid-connected inverse
Become repetitive control research in device " a literary composite control method combined with Repetitive controller with PI control, because PI is controlled
Enough rejection abilities for industrial frequency harmonic in network voltage can not be obtained while guaranteeing system stability therefore need to use
Repetitive controller is a kind of relatively good in the ability for inhibiting Voltage Harmonic as the LCL type gird-connected inverter controlled PI
Supplement, for LCL gird-connected inverter, it is that one kind can be improved system inhibition low-frequency harmonics energy that Repetitive controller is combined with PI control
The composite control method of power." the parallel network reverse with LCL output filter in 12nd phase " Proceedings of the CSEE " in 2011
Device control strategy research " proposes that a kind of gird-connected inverter to feedover based on inverter side current closed-loop and capacitance current controls plan
Slightly, grid-connected current is indirectly controlled by inverter side electric current.The control strategy can guarantee system stabilization and unity power factor
Operation, and entire control process reduces system cost, enhances system reliability without increasing additional sensor.
Power grid is used in " control strategy of LCL filtering gird-connected inverter " text in 27th phase " Proceedings of the CSEE " in 2012
Side inductive current and inverter side inductive current double-loop control strategy directly control grid-connected current, grid side inductive current
It is easier to inhibit the harmonic wave factor of grid-connected current as outer ring, and the unity power factor of networking electric current can be directly controlled, adopt
It uses inverter side inductive current that can increase system damping as inner ring, to can inhibit system oscillation, increases system stability.
" the LCL gird-connected inverter voltage feed-forward control of inverter side current feedback in 6th phase " Proceedings of the CSEE " in 2013
A kind of complete voltage feed-forward control suitable for inverter side current feedback LCL gird-connected inverter is used in a control strategy " text
Control strategy, which can completely eliminate influence of the network voltage to power network current, and grid-connected power factor has obtained significantly
Promotion.
Summary of the invention
The present invention mainly proposes a kind of three-phase LCL type photovoltaic combining inverter control method, it is characterised in that uses electric current
Voltage Three-loop control, the specific steps are as follows:
Specific implementation step is as follows:
The first step obtains current signal i from grid sidea、ib、ic, synchronizing current signal is obtained by phaselocked loop (PLL), then
By abc/ α β coordinate transform, the current signal i in rest frame is obtainedsα、isβ；
DC bus-bar voltage U is calculated in second step, samplingdcAnd with reference value UrefBe compared, errors pass through than
Example resonance controls PR device, and in order to solve, PR control gain at fundamental frequency is infinitely great and gains at other frequencies are in declining
Subtract Trend Problem, in original transmission functionOn the basis of increase second order improper integral Hi(s) it obtains
New transmission function Gpr+Hi(s), the characteristics of having and be not necessarily to coordinate transform, just capable of reaching zero steady-state error under rest frame,
In: Kp is the coefficient of proportional component, and Ki is the coefficient of integral element, ω0For resonance angular frequency；
Third step, PR adjuster output current signal respectively withIt carries out plus-minus and current signal is calculated, be
Improving PR controller inhibits grid-connected harmonic current and the ability of the various disturbances of tracking to introduce Repetitive controller, to stablize three-phase LCL type
Inverter control system damps existing resonance peak, by the interior ring capacitance of the output signal of Repetitive controller and ratio (P) controller
Current signal summation, then corresponding space vector pulse width modulation signal (SVPWM) is generated after carrying out α β/abc coordinate transform to control
Power tube switch processed.
Detailed description of the invention
The control structure figure of Fig. 1 three-phase LCL grid-connected inverter system
Fig. 2 grid-connected current waveform diagram
Fig. 3 modified complex controll experimental waveform figure
Emulation and analysis of experimental results
System simulation model is built using Matlab/Simulink simulation software, simulation parameter is as follows: network voltage
220V/50Hz, DC side busbar voltage 380V set IGBT as full-bridge inverting form, and DC bus capacitor C1 is 7500 μ F, pusher side
Filter inductance L1 is 1.2mH, and net side filter inductance L2 is 0.4mH, and filter capacitor C is 10 μ F, and DC voltage reference value is
700V, switching frequency fs are 10kHz.In emulation, it is assumed that voltage on line side has larger fluctuation, total harmonic distortion
(TotalHarmonicDistortion, THD) is 4.6%.Fig. 2 (a) is the grid-connected current waveform under conventional composite control, (b)
For the grid-connected current waveform under modified control.From simulation result it can be seen that ratio resonance (PR) controller is introduced compound control
The grid-connected current waveform of system can be effectively improved in system.
In order to verify the effect of above-mentioned control method, the LCL type photovoltaic combining inverter experiment sample of a 10kW has been built
Machine.Experiment porch mainly includes main circuit structure and accessory power supply, sample circuit structure and controller.Experiment parameter is referring to emulation
Parameter, wherein controller hardware part uses (DSP) TMS320F28027.To Three phase of the invention on the experiment porch
The controller of LCL type photovoltaic combining inverter carries out experimental verification.Fig. 3 (a) is shown with three-phase LCL type under new controller
The experimental waveform of the grid-connected output voltage electric current of photovoltaic combining inverter.Using HDGC3510 power quality analyzer in Fig. 3 (a)
Output electric current carry out analysis can obtain Fig. 3 (b) grid-connected current frequency analysis figure, as can be seen from the figure each time of steady-state current is humorous
Wave content makes grid-connected current waveform 0.5% hereinafter, significantly inhibit using modified complex controll to harmonic wave
Meet the requirement of national standard.The results show validity and feasibility of this method.
Claims (1)
1. a kind of three-phase LCL photovoltaic combining inverter control method, it is characterised in that use Current Voltage Three-loop control, specifically
Steps are as follows:
The first step obtains current signal i from grid sidea、ib、ic, synchronizing current signal is obtained by phaselocked loop (PLL), using
Abc/ α β coordinate transform, obtains the current signal i in rest framesα、isβ；
DC bus-bar voltage U is calculated in second step, samplingdcAnd with reference value UrefIt is compared, errors are humorous by ratio
Shake controller, is that infinitely great and at other frequencies gains are in solve the gain at fundamental frequency of ratio resonant controller
Attenuation trend problem, in original transmission functionOn the basis of increase second order improper integral Hi(s)
To new transmission function Gpr+Hi(s), the characteristics of having and be not necessarily to coordinate transform, just capable of reaching zero steady-state error under rest frame,
Wherein: Kp is the coefficient of proportional component, and Ki is the coefficient of integral element, ω0For resonance angular frequency；
Third step inhibits grid-connected harmonic current and the ability of the various disturbances of tracking to introduce and repeat control to improve ratio resonant controller
System, the current signal of ratio resonant controller outputRespectively with current signal isα、isβIt carries out plus-minus and weight is calculated
The input signal controlled again sums the inner ring capacitance current signal of the output signal of Repetitive controller and ratio (P) controller, then
Corresponding space vector pulse width modulation signal (SVPWM) is generated after carrying out α β/abc coordinate transform to control power tube switch.
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| CN105762801B (en) * | 2016-03-25 | 2018-11-30 | 江苏省电力公司无锡供电公司 | The double current loop modulation method based on repetition PR control of three-phase LCL type gird-connected inverter |
| CN109412194B (en) * | 2017-08-15 | 2022-03-22 | 中车株洲电力机车研究所有限公司 | Control method and system of three-phase LCL type grid-connected inverter |
| CN109755941B (en) * | 2019-03-27 | 2020-12-01 | 清华大学 | LCL filter active damping control method and system |
| CN110729752B (en) * | 2019-06-21 | 2023-04-21 | 电子科技大学 | Output impedance remolding method of grid-connected inverter parallel system |
| CN110289635B (en) * | 2019-06-24 | 2020-12-18 | 合肥工业大学 | Grid-connected current control strategy based on improved repetitive control |
| CN115378040A (en) * | 2022-10-19 | 2022-11-22 | 湖北工业大学 | Grid-connected system based on LCL type photovoltaic inverter and QVR control method |
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| CN101950983A (en) * | 2010-10-08 | 2011-01-19 | 天津理工大学 | Two-stage photovoltaic grid-connected control system based on combination of pole allocation and repetitive control |
| CN103280837A (en) * | 2013-05-30 | 2013-09-04 | 广西电网公司电力科学研究院 | Photovoltaic grid connected direct current injecting restraining method |
| CN103368181B (en) * | 2013-08-01 | 2015-02-25 | 哈尔滨工业大学 | Three-phase grid-connected inverter current harmonic suppression method based on LCL-type filter repetitively controlled under two-phase static coordinate system |
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