市电平衡式光伏发电系统双PWM变流器的研究
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摘要
针对市电平衡式光伏发电系统与电网之间存在能量双向流动问题,研究双PWM变流器控制.根据三相双PWM变流器的电路拓扑结构搭建了基于dq坐标的数学模型,并结合空间矢量调制、三相锁相环设计了系统的双闭环控制策略及双PWM变流器的协调控制策略.根据系统功率平衡的实际需求,设计了直流侧电容、交流侧滤波电感的参数.仿真和实验样机验证了系统控制策略的有效性及双PWM变流器实现市电平衡式光伏发电系统中功率平衡的可行性.
In view of the problem of two-way flow of energy between balanced photovoltaic power generation system in city electricity and the grid,the control of dual PWM converter is studied.The mathematical model based on d qaxis is set up according to the circuit topology of threephase dual PWM converter,and the double closed loop control strategy of system and dual PWM converter coordinated control strategy are designed combining with the space vector modulation,three-phase digital phase-locked loop.The parameters of DC side capacitor and AC side filer inductor are designed according to the actual demand of system power balance.Simulation and experimental results verify the effectiveness of the system control strategy and the feasibility of the dual PWM converter to achieve the power balance in balanced photovoltaic power generation system in city electricity.
In view of the problem of two-way flow of energy between balanced photovoltaic power generation system in city electricity and the grid,the control of dual PWM converter is studied.The mathematical model based on d qaxis is set up according to the circuit topology of threephase dual PWM converter,and the double closed loop control strategy of system and dual PWM converter coordinated control strategy are designed combining with the space vector modulation,three-phase digital phase-locked loop.The parameters of DC side capacitor and AC side filer inductor are designed according to the actual demand of system power balance.Simulation and experimental results verify the effectiveness of the system control strategy and the feasibility of the dual PWM converter to achieve the power balance in balanced photovoltaic power generation system in city electricity.
引文
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[2]靳恒,姜世公,王卫.光伏并网系统能量双向流动控制策略研究[J].电源学报,2011(3):21-26.
[3]王帮亭.三相双向PWM整流器模型与控制电路设计[J].电子科技,2015,28(8):53-59.
[4]DIONISIO R,CARLOS V,FRANCISCO B.Adaptation of floating point DSP-based technology for small variable-speed wind turbine[J].IEEE trans on energy conversion,2007,22(2):376-382.
[5]何通能,安康,逯峰.基于模糊PI控制的三相船用逆变电源研究[J].浙江工业大学学报,2013,41(2):222-227.
[6]王强钢,周念成,颜伟,等.采用背靠背变流器接入配电网改善低压微网电压质量的控制设计[J].电工技术学报,2013,28(4):171-181.
[7]童建平,李瑭,钱如一.绿色节能控制器的设计[J].浙江工业大学学报,2013,41(3):342-354.
[8]严干贵,李军徽,蒋桂强,等.背靠背电压源型变流器的非线性解耦矢量控制[J].电工技术学报,2010,25(5):129-135.
[9]沈阳武,彭晓涛,孙元章.背靠背双PWM变流器的协调控制策略[J].电网技术,2012,36(1):146-152.
[10]葛艳华,任晓刚,邓元实,等.网侧变流器电压定向矢量控制分析与实验[J].电力电子技术,2012,46(8):19-21.
[11]裴素萍,吴必瑞.三相PWM整流器主电路参数确定方法[J].电测与仪表,2014,53(13):84-88.
[12]尹泉,刘行,王庆义.三相电压型PWM整流器主电路参数设计[J].变频器世界,2011(12):56-59.