电网电压对称骤升下DFIG的HVRT协调控制策略
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摘要
为解决双馈风电机组(DFIG)中的高电压穿越(HVRT)问题,保证持续并网运行,提出在DFIG转子侧变流器引入附加阻抗控制,网侧变流器采用双闭环矢量控制,电网发生故障后,根据电网电压骤升幅度吸收部分无功功率,当电网电压对称骤升至1.3倍额定电压时,启动风电场已有无功补偿装置发出感性无功功率。通过上述协调控制策略抑制DFIG定、转子过电压、过电流及电磁转矩波动,减小了系统冲击,实现了DFIG的HVRT能力,缓解了大规模风电机组脱网问题。在Matlab/Simulink上进行仿真,验证了所提策略的有效性和可行性。
In order to solve hgih voltage ride through(HVRT)of doubly fed induction generator(DFIG),and ensure its continuous grid connection operation.An additional impedance control is introduced into the rotor side converter of a DFIG.Double closed loop vector control is used in grid-side converter.When the fault occurs,the reactive power is absorbed according to the voltage surge amplitude.When the voltage of the power grid rises to 1.3 times rated voltage symmetrically, the reactive power compensation device of the wind farm has sent out the inductive reactive power.Through the coordination control strategy mentioned above,the fluctuation of stator,rotor overvoltage,overcurrent and electromagnetic torque of DFIG is restrained,the system shock is reduced,and the restoration of grid voltage is supported.The high voltage traversing ability of DFIG is realized,and the problem of large scale wind turbine decoupling is alleviated.The simulation on Matlab/Simulink verifies the effectiveness and feasibility of the proposed strategy.
In order to solve hgih voltage ride through(HVRT)of doubly fed induction generator(DFIG),and ensure its continuous grid connection operation.An additional impedance control is introduced into the rotor side converter of a DFIG.Double closed loop vector control is used in grid-side converter.When the fault occurs,the reactive power is absorbed according to the voltage surge amplitude.When the voltage of the power grid rises to 1.3 times rated voltage symmetrically, the reactive power compensation device of the wind farm has sent out the inductive reactive power.Through the coordination control strategy mentioned above,the fluctuation of stator,rotor overvoltage,overcurrent and electromagnetic torque of DFIG is restrained,the system shock is reduced,and the restoration of grid voltage is supported.The high voltage traversing ability of DFIG is realized,and the problem of large scale wind turbine decoupling is alleviated.The simulation on Matlab/Simulink verifies the effectiveness and feasibility of the proposed strategy.
引文
[1]赵宏博,姚良忠,王伟胜.大规模风电高压脱网分析及协调预防控制策略[J].电力系统自动化,2015,39(23):43-48.65.
[2]孙华东,张振宇,林伟芳,等.2011年西北电网风机脱网事故分析及启示[J].电网技术,2012,36(10):76-80.
[3]郑重,耿华,杨耕.新能源发电系统并网逆变器的高电压穿越控制策略[J].中国电机工程学报,2015,35(6):1463-1472.
[4]谢震,张兴,宋海华.电网电压骤升故障下双馈风力发电机变阻尼控制策略[J].电力系统自动化,2012,36(3):39-46.
[5]罗少杰,朱玲.电网电压骤升情况下双馈变流器控制策略研究[J].电力系统保护与控制,2017,45(24):1-7.
[6]徐海亮,章玮,陈建生.考虑动态无功支持的双馈风电机组高电压穿越控制策略[J].中国电机工程学报,2013,33(36):112-119.
[7]李俊杰,蒋昆,刘国平.采用串联网侧变换器的双馈风电系统高电压穿越控制策略[J].电网技术,2014,38(11):3037-3044.
[8]李少林,王伟胜,王瑞明.双馈风电机组高电压穿越控制策略与试验[J].电力系统自动化,2016,40(16):76-82.
[2]孙华东,张振宇,林伟芳,等.2011年西北电网风机脱网事故分析及启示[J].电网技术,2012,36(10):76-80.
[3]郑重,耿华,杨耕.新能源发电系统并网逆变器的高电压穿越控制策略[J].中国电机工程学报,2015,35(6):1463-1472.
[4]谢震,张兴,宋海华.电网电压骤升故障下双馈风力发电机变阻尼控制策略[J].电力系统自动化,2012,36(3):39-46.
[5]罗少杰,朱玲.电网电压骤升情况下双馈变流器控制策略研究[J].电力系统保护与控制,2017,45(24):1-7.
[6]徐海亮,章玮,陈建生.考虑动态无功支持的双馈风电机组高电压穿越控制策略[J].中国电机工程学报,2013,33(36):112-119.
[7]李俊杰,蒋昆,刘国平.采用串联网侧变换器的双馈风电系统高电压穿越控制策略[J].电网技术,2014,38(11):3037-3044.
[8]李少林,王伟胜,王瑞明.双馈风电机组高电压穿越控制策略与试验[J].电力系统自动化,2016,40(16):76-82.