CN102946115B - Based on the Three-Phase PWM Converter control method of LCL filter amphiorentation coordinate transform - Google Patents

Based on the Three-Phase PWM Converter control method of LCL filter amphiorentation coordinate transform Download PDF

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CN102946115B
CN102946115B CN201210404288.XA CN201210404288A CN102946115B CN 102946115 B CN102946115 B CN 102946115B CN 201210404288 A CN201210404288 A CN 201210404288A CN 102946115 B CN102946115 B CN 102946115B
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voltage
pwm converter
phase
grid side
current
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CN102946115A (en
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陈毅东
陈琪
冷嘉骥
李惊春
王迪
孟凡革
李欣
屈虎
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HARBIN ELECTRIC MACHINERY FACTORY (ZHENJIANG) Co Ltd
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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
    • Y02E40/30—Reactive power compensation
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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Abstract

The present invention relates to the control technology of wind driven power generation and transmission system, specifically a kind of Three-Phase PWM Converter control method based on the conversion of LCL filter two-way coordinates.The method is based on the vector control method of rotating coordinate transformation, utilize line voltage, capacitance voltage amphiorentation, and power network current is based on grid voltage orientation, converter current is directed based on capacitance voltage, each vector all adopts synchronous rotating angle, realizes converter to gain merit the/uneoupled control of reactive current.Method of the present invention while maintenance DC voltage is constant, can makes the control that the reactive power of grid side can be precise and stable, solves the problem of general LCL converter grid side power factor controlling complexity; This control method can be widely used in needing accurately to control grid side reactive power and in Three-Phase PWM Converter based on LCL filtering.

Description

Based on the Three-Phase PWM Converter control method of LCL filter amphiorentation coordinate transform
Technical field
The present invention relates to the control technology of wind driven power generation and transmission system, specifically a kind of Three-Phase PWM Converter control method based on the conversion of LCL filter two-way coordinates.
Background technology
In Wind turbines, current transformer has been the vitals of electric energy conversion, and the electric energy that its regulator generator sends, will meet the electric energy feed-in electrical network of grid-connected requirement.The performance of converter system decides the quality of feed-in electrical network electric energy, and current transformer is generally made up of two back-to-back pwm converters.Consider from root, the performance quality of pwm converter is performance important indicator of generating electricity by way of merging two or more grid systems of Wind turbines.
Pwm converter power electronics, new energy field application widely, its general principle is by the control to switching tube between connection DC side and AC, complete the transmission of DC side and AC energy with the form of PWM ripple, but it can cause containing compared with the harmonic wave around the switching frequency of high ingredient in ac-side current.In order to reduce the harmonic wave injecting electrical network electric current, being a kind of conventional means, comparing L filtering in converter grid side access LCL filter, it by lower total inductance value, can obtain good high order harmonic component filtration result.
The pwm converter based on LCL filter conventional at present generally directly cannot control reactive power or the power factor of grid side, the occasion of requirement is had to net side power factor at some, as the full power convertor in total power Wind turbines, its grid side converter needs the reactive power directly controlling Wind turbines input electrical network.For another example Double-feed wind power current transformer, in normal operation, grid side converter needs to work in rectification state or inverter mode according to different situations, under this two states, all needs to control the reactive power of input electrical network.
Therefore, the control method studying a kind of novel Three-Phase PWM Converter based on LCL filter has important theory significance and real value.
Some have been had to study to the control method of the Three-Phase PWM Converter based on LCL filter in industry, patent " a kind of Three-Phase PWM Rectifier three close-loop control method of LCL filtering " (publication number: CN102437753A), " voltage type active rectifier steady control system and method based on LCL filtering " (publication number: CN101141100A), " a kind of double-current ring control method of LCL filtering combining inverter " (publication number: CN102340257A), a kind of capacitance current feed forward control method of the combining inverter with LCL filter " (publication number: CN102075108A) be proposed the control method of the Three-Phase PWM Rectifier based on LCL filtering.The defect that these control methods exist is, the rate-determining steps of power factor or reactive power is complicated or directly do not control, and have impact on the control effects of Three-Phase PWM Rectifier.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of simply effective, reliable and stable, control method that accurately can control the Three-Phase PWM Converter based on LCL filtering of power system reactive power.
The control method of the Three-Phase PWM Converter based on LCL filtering of the present invention is:
The Three-Phase PWM Converter major loop that the method is applied includes LCL filter, IGBT converts bridge, DC side Support Capacitor and load; Its control procedure comprises the following steps:
Step one, carries out coordinate transform and phase-locked process to line voltage e, obtains the e of line voltage e under two cordic phase rotators dand phase angle theta 2, current on line side i 2based on the phase angle theta of line voltage e 2orientation, obtains i 2d, i 2q, to given with reference to reactive power Q *with e dnet side is obtained with reference to q shaft current component i after computing 2q *; By i 2qand i 2q *error signal relatively gives first group of pi controller PI 1, first group of pi controller PI 1output as pwm converter exchangeside current i 1qsetting signal, be labeled as i 1q *; DC voltage exports the error signal after comparing with DC voltage set-point and gives second group of pi controller PI 2, second group of pi controller PI 2output as pwm converter ac-side current i 1dsetting signal, be labeled as i 1d *;
Step 2, to capacitance voltage u in LCL filter ccarry out coordinate transform and phase-locked process, obtain capacitance voltage u cdq axle component u under two-phase rotating coordinate system cd, u cqand phase angle theta 1, the ac-side current i of pwm converter 1according to capacitance voltage u cphase angle theta 1orientation, obtains pwm converter side current i 1the dq axle component i under two-phase rotating coordinate system 1d, i 1q;
Step 3, by i 1qand i 1q *relatively, the error signal relatively gives the 3rd group of pi controller PI 3, the 3rd group of pi controller PI 3output and capacitance voltage q axle component u cqand the q shaft voltage component ω Li that pwm converter ac-side current d axle component is coupled on Inductor 1dafter computing, draw pwm converter voltage on line side q axle component v q; Same, by i 1dand i 1d *relatively, the error signal relatively gives the 4th group of pi controller PI 4, the 4th group of pi controller PI 4output and capacitance voltage d axle component u cdand the d shaft voltage component ω Li that pwm converter ac-side current q axle component is coupled on Inductor 1qafter computing, draw pwm converter voltage on line side d axle component v d; By pwm converter voltage on line side component v d, v qthree-phase static coordinate system is transformed to, the modulating wave v obtained from two-phase rotating coordinate system a, v b, v cproduce SPWM signal through the process of SPWM generator module and drive IGBT action, to control the reactive power of the constant and grid side of Three-Phase PWM Converter system held DC voltage.
Compared with the control method of the existing pwm converter based on LCL filtering, method of the present invention has following advantage:
1. the Reactive Power Control based on grid voltage orientation directly, accurately can control power system reactive power.
2. the inner ring Current Control based on capacitance voltage orientation makes the control for pwm converter AC voltage make Mathematical Modeling herein more simple, thus reduces the upper difficulty of control.
3. the control of control realization to DC voltage of DC voltage outer shroud, ensure that dynamic response and the stability requirement of direct voltage.
Accompanying drawing explanation
Fig. 1 is pwm converter major loop and the control principle drawing thereof of the embodiment of the present invention;
Fig. 2 is the embodiment line voltage, power network current and the DC voltage oscillogram when steady operation that adopt the inventive method;
Fig. 3 adopts the embodiment of the inventive method when carrying out Reactive-power control, the oscillogram of electric network active, idle dynamic change;
Fig. 4 adopts the embodiment of the inventive method when line voltage symmetry is fallen, line voltage, power network current and DC voltage oscillogram;
Fig. 5 adopts the embodiment of the inventive method when line voltage symmetry is fallen, the oscillogram of electric network active, idle change;
Fig. 6 is the embodiment electrical network A phase current fft analysis result figure when steady operation adopting the inventive method.
Embodiment
As shown in Figure 1, the Three-Phase PWM Converter major loop that the embodiment of the present invention is applied includes by L 1, C fand L 2the LCL filter formed, IGBT convert bridge, DC side Support Capacitor and load; The detection and control part of major loop comprises the measure voltage & current transmitter (totally 5 groups, do not provide in figure) of electrical network, electric capacity and DC side; The phase-locked loop module PLL(of line voltage and capacitance voltage totally 2 groups); For electric current and voltage signal are changed the coordinate transformation module 1(totally 4 groups to two-phase rotating coordinate system from static three phase coordinate system transfers); For calculating the computing module M(totally 1 group of reactive current set-point according to given reactive power); For the proportional and integral controller PI that voltage and current error regulate 1-PI 4(totally 4 groups); For converter AC control signal being converted to three-phase static coordinate system from two-phase rotating coordinate system and producing the IGBT drive singal generation module 2(totally 1 group of SPWM signal).
Its control procedure comprises the following steps:
Step one, carries out coordinate transform and phase-locked process by the phase-locked loop module PLL of correspondence and coordinate conversion module 1 couple of line voltage e, obtains the e of line voltage e under two cordic phase rotators dand phase angle theta 2, current on line side i 2based on the phase angle theta of line voltage e 2orientation, obtains i 2d, i 2q, to given with reference to reactive power Q *with e dnet side is obtained with reference to q shaft current component i after computing 2q *; By i 2qand i 2q *error signal relatively gives first group of pi controller PI 1, first group of pi controller PI 1output as pwm converter exchangeside current i 1qsetting signal, be labeled as i 1q *; DC voltage exports the error signal after comparing with DC voltage set-point and gives second group of pi controller PI 2, second group of pi controller PI 2output as pwm converter ac-side current i 1dsetting signal, be labeled as i 1d *;
Step 2, to capacitance voltage u in LCL filter ccarry out coordinate transform and phase-locked process, obtain capacitance voltage u cdq axle component u under two-phase rotating coordinate system cd, u cqand phase angle theta 1, the ac-side current i of pwm converter 1according to capacitance voltage u cphase angle theta 1orientation, obtains pwm converter side current i 1the dq axle component i under two-phase rotating coordinate system 1d, i 1q;
Step 3, by i 1qand i 1q *relatively, the error signal relatively gives the 3rd group of pi controller PI 3, the 3rd group of pi controller PI 3output and capacitance voltage q axle component u cqand the q shaft voltage component ω Li that pwm converter ac-side current d axle component is coupled on Inductor 1dafter computing, draw pwm converter voltage on line side q axle component v q; Same, by i 1dand i 1d *relatively, the error signal relatively gives the 4th group of pi controller PI 4, the 4th group of pi controller PI 4output and capacitance voltage d axle component u cdand the d shaft voltage component ω Li that pwm converter ac-side current q axle component is coupled on Inductor 1qafter computing, draw pwm converter voltage on line side d axle component v d; By pwm converter voltage on line side component v d, v qthree-phase static coordinate system is transformed to, the modulating wave v obtained from two-phase rotating coordinate system a, v b, v cproduce SPWM signal through the process of SPWM generator module and drive IGBT action, to control the reactive power of the constant and grid side of Three-Phase PWM Converter system held DC voltage.
The embodiment of the inventive method is used for the l-G simulation test of the Three-Phase PWM Rectifier system of a 0.5MW.The major parameter of this Three-Phase PWM Rectifier system is: grid line voltage effective value 690V, AC filter inductance value L 1=0.48mH, filtering capacitance C f=160uF, grid side filter inductance value L 2=0.3mH, DC voltage set-point 1150Vdc, switching frequency 2.5kHz.
The waveform of power network current, DC voltage and reactive power when Fig. 2 is steady operation.
Fig. 3 is reactive power dynamic response test waveform, and test mode is set to 0.2Mvar, 0.3Mvar ,-0.2Mvar, 0Mvar by given for reactive power respectively when 0.1s, 0.2s, 0.3s, 0.4s.
Fig. 4 and Fig. 5 has done one when line voltage falls extremely, to the waveform of whole system stability test.
When Fig. 6 is steady operation, current on line side is done to the block diagram of fft analysis.
Test waveform as can be seen from accompanying drawing:
1. when stable state, the control of rectifier is stablized, and by learning that the THD of this system grid side electric current is very low to the analysis of FFT frequency spectrum, system achieves the control of low harmony wave.
2. system can the reactive power of free setting grid side, realizes High Power Factor and controls, also can change System Reactive Power according to demand simultaneously.System is for idle given dynamic better corresponding, and the response time is within 25ms.System achieves idle given accurate tracking fast.
3., when disturbance appears in line voltage, the operation that this system can be reliable and stable, the control of DC voltage and reactive power is all accurately very fast.

Claims (1)

1., based on a control method for the Three-Phase PWM Converter of LCL filtering, the Three-Phase PWM Converter major loop that the method is applied includes LCL filter, IGBT converts bridge, DC side Support Capacitor and load; It is characterized in that: control procedure comprises the following steps,
Step one, carries out coordinate transform and phase-locked process to line voltage e, obtains the e of line voltage e under two cordic phase rotators dand phase angle theta 2, grid side current i 2based on the phase angle theta of line voltage e 2orientation, obtains i 2d, i 2q, to given with reference to reactive power Q *with e dgrid side is obtained with reference to q shaft current component i after computing 2q *; By i 2qand i 2q *error signal relatively gives first group of pi controller PI 1, first group of pi controller PI 1output as pwm converter grid side current i 1qsetting signal, be labeled as i 1q *; DC voltage exports the error signal after comparing with DC voltage set-point and gives second group of pi controller PI 2, second group of pi controller PI 2output as pwm converter grid side current i 1dsetting signal, be labeled as i 1d *;
Step 2, to capacitance voltage u in LCL filter ccarry out coordinate transform and phase-locked process, obtain capacitance voltage u cdq axle component u under two-phase rotating coordinate system cd, u cqand phase angle theta 1, the grid side current i of pwm converter 1according to capacitance voltage u cphase angle theta 1orientation, obtains pwm converter side current i 1the dq axle component i under two-phase rotating coordinate system 1d, i 1q;
Step 3, by i 1qand i 1q *relatively, the error signal relatively gives the 3rd group of pi controller PI 3, the 3rd group of pi controller PI 3output and capacitance voltage q axle component u cqand the q shaft voltage component ω Li that pwm converter grid side electric current d axle component is coupled on grid side inductance 1dafter computing, draw pwm converter grid side voltage q axle component v q; Same, by i 1dand i 1d *relatively, the error signal relatively gives the 4th group of pi controller PI 4, the 4th group of pi controller PI 4output and capacitance voltage d axle component u cdand the d shaft voltage component ω Li that pwm converter grid side electric current q axle component is coupled on grid side inductance 1qafter computing, draw pwm converter grid side voltage d axle component v d; By pwm converter grid side component of voltage v d, v qthree-phase static coordinate system is transformed to, the modulating wave v obtained from two-phase rotating coordinate system a, v b, v cproduce SPWM signal through the process of SPWM generator module and drive IGBT action, to control the reactive power of the constant and electric grid side of Three-Phase PWM Converter system held DC voltage.
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CN103280836B (en) * 2013-05-23 2015-08-19 中国科学院电工研究所 A kind of flywheel energy storage system grid-connected control method and energy-storage system thereof
CN103545845B (en) * 2013-11-06 2015-08-12 重庆大学 Under Voltage Harmonic, double-fed induction wind power system suppresses grid-connected power fluctuation control method
CN105071392A (en) * 2015-09-19 2015-11-18 许昌学院 Permanent-magnetic synchronous wind power system harmonic analysis and suppression method
CN107769257B (en) * 2017-11-27 2019-02-26 湖北工业大学 A kind of method for controlling frequency conversion of the photovoltaic combining inverter based on LCL filtering
CN108880317B (en) * 2018-09-12 2024-01-09 珠海泰通电气技术有限公司 Three-ring control device and method for converter
CN111431428B (en) * 2020-04-24 2023-03-21 上海电力大学 Decoupling control method for separated source inverter based on synchronous reference coordinate system
CN111969631A (en) * 2020-09-07 2020-11-20 广东工业大学 Energy storage converter and control method thereof
CN113595430B (en) * 2021-08-05 2022-12-20 上海交通大学 Three-loop controller of LCL type grid-connected inverter and parameter design method thereof

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