双馈式风电机组直接电压控制策略研究
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摘要
风电渗透率的提高给电力系统安全稳定运行带来了新的问题,特别是风电接入后的电压稳定性。为了充分利用双馈式风电机的电压控制能力,本文提出了一种直接电压控制策略,其将电压偏离值通过一阶惯性环节得到的电流参考值作为DFIG变流器内环电流控制的输入信号,以DFIG的输出功率为控制对象,实现电压控制。仿真结果表明,风电机组采用直接电压控制策略,在系统遭受扰动时通过快速无功电压调节,能够有效控制风电场并网点电压,并且局部系统电压水平恢复良好,为DFIG风电场参与系统协调电压控制打下了基础。
The increase of wind power penetration has brought new problems to the safe and stable operation of power system, especially the voltage stability after wind power integration. In order to make full use of DFIG's voltage control ability, a direct voltage control strategy is proposed in this paper, which takes the current reference value obtained from the first-order inertia step of the voltage deviation as the DFIG converter inner-loop current control of the input signal to the output power of the DFIG as the control object, to achieve voltage control. The simulation results show that the wind farm using direct voltage control strategy, with fast reactive voltage regulation during system disturbances, can effectively control the wind farm grid-connected point voltage and local system voltage levels can be restored well. This can lay the foundation for DFIG wind farm to participate in system coordinated voltage control.
The increase of wind power penetration has brought new problems to the safe and stable operation of power system, especially the voltage stability after wind power integration. In order to make full use of DFIG's voltage control ability, a direct voltage control strategy is proposed in this paper, which takes the current reference value obtained from the first-order inertia step of the voltage deviation as the DFIG converter inner-loop current control of the input signal to the output power of the DFIG as the control object, to achieve voltage control. The simulation results show that the wind farm using direct voltage control strategy, with fast reactive voltage regulation during system disturbances, can effectively control the wind farm grid-connected point voltage and local system voltage levels can be restored well. This can lay the foundation for DFIG wind farm to participate in system coordinated voltage control.
引文
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[14]王彬,郭庆来,李海峰,等.含风电接入的省地双向互动协调无功电压控制[J].电力系统自动化,2014(24):48-55.WANG Bin,GUO Qinglai,LI Haifeng,et al. Reactive voltage control of bidirectional-interaction coordination between provincial and district power networks with wind power integration[J]. Automation of Electric Power Systems, 2014(24):48-55.
[15]史保壮,MAC,DOWELL J,PIWKO R,et al.风电并网技术的新进展[J].电力设备,2008,9(11):20-23.SHI Baozhuang, MACDOWELL J,PIWKO R,et al. New progress of technology for wind power access to power grid[J].Electrical Equipment,2008,9(11):20-23.
[2]许晓菲,牟涛,贾琳,等.大规模风电汇集系统静态电压稳定实用判据与控制[J].电力系统自动化,2014,38(9):15-19.XU Xiaofei, MOU Tao, JIA Lin, et al. Practical criteria of static voltage stability in power systems with high wind penetration[J]. Automation of Electric Power Systems, 2014,38(9):15-19.
[3]薛禹胜,雷兴,薛峰,等.关于风电不确定性对电力系统影响的评述[J].中国电机工程学报,2014,34(29):5029-5040.XUE Yusheng,LEI Xing,XUE Feng,et al. A review on impacts of wind power uncertainties on power systems[J]. Proceedings of the CSEE, 2014,34(29):5029-5040.
[4]迟永宁,刘燕华,王伟胜,等.风电接入对电力系统的影响[J].电网技术,2007,31(3):77-81.CHI Yongning,LIU Yanhua,WANG Weisheng,et al. Study on impact of wind power integration on power system[J].Power System Technology,2007,31(3):77-81.
[5]邹志翔,周克亮,袁晓冬.风电场接人对周边地区电网电压稳定性的影响分析[J].电网技术,2011,35(11):50-56.ZOU Zhixiang, ZHOU Keliang, YUAN Xiaodong. Analysis on influences of grid-connected wind farm on voltage stability of local power network neighboring to connection point[J].Power System Technology, 2011, 35(11):50-56.
[6]孙伟伟,付蓉,陈永华.计及无功裕度的双馈风电场无功电压协调控制[J].电力自动化设备,2014,34(10):81-85.SUN Weiwei, FU Rong, CHEN Yonghua. Coordinated var and voltage control of doubly-fed wind farm considering reactive power margin[J]. Electric Power Automation Equipment, 2014,34(10):81-85.
[7]王振浩,葛津铭,陈继开.风电场群接入地区电网电压无功协调控制的研究[J].电测与仪表,2014(21):57-62.WANG Zhenhao,GE Jinming,CHEN Jikai. Research on the reactive power control strategy in the wind power integrated region[J]. Electrical Measurement&Instrumentation, 2014(21):57-62.
[8]卢锦玲,何振民,魏方园,等.计及风光出力相关性的静态电压稳定概率分析[J].华北电力大学学报:2016,43(1):58-64.LU Jinling,HE Zhenmin, WEI Fangyuan,et al. Probabilistic analysis of voltage stability for power system considering correlativity of wind-solar output[J]. Journal of North China Electric Power University,2016,43(1):58-64.
[9]杨硕,王伟胜,刘纯,等.改善风电汇集系统静态电压稳定性的无功电压协调控制策略[J].电网技术,2014.38(5):1250-1256.YANG Shuo, WANG Weisheng,LIU Chun,et al. Coordinative strategy of reactive power and voltage control for improving static voltage stability of wind power centralized system[J].Power System Technology,2014,38(5):1250-1256.
[10]蔡游明,李征,蔡旭.以并网点电压和机端电压平稳性为目标的风电场无功电压协调控制[J].电力自动化设备,2018,38(08):166-173.CAI Youming,LI Zheng, CAI Xu.Coordinated control of reactive power and voltage for wind farm aiming at voltage stability of PCC and generator terminal[J]. Electric Power Automation Equipment,2018,38(08):166-173.
[11]陈宁,朱凌志,王伟.改善接入地区电压稳定性的风电场无功控制策略[J].中国电机工程学报,2009,29(10):102-108.CHEN Ning,ZHU Lingzhi, WANG Wei.Strategy for reactive power control of wind farm for improving voltage stability in wind power integrated region[J]. Proceedings of the CSEE, 2009,29(10):102-108.
[12]朱凌志,陈宁,王伟.兼顾接入地区无功需求的风电场无功控制策略[J].电力系统自动化,2009,33(5):80-85.ZHU Lingzhi, CHEN Ning, WANG Wei. Wind farm reactive power control strategy considering local networks demand[J].Automation of Electric Power Systems, 2009,33(5):80-85.
[13]徐峰达,郭庆来,孙宏斌,等.基于模型预测控制理论的风电场自动电压控制[J].电力系统自动化,2015(7):59-67.XU Fengda,GUO Qinglai,SUN Hongbin,et al. Automatic voltage control of wind farms based on model predictive control theory[J]. Automation of Electric Power Systems,2015(7):59-67.
[14]王彬,郭庆来,李海峰,等.含风电接入的省地双向互动协调无功电压控制[J].电力系统自动化,2014(24):48-55.WANG Bin,GUO Qinglai,LI Haifeng,et al. Reactive voltage control of bidirectional-interaction coordination between provincial and district power networks with wind power integration[J]. Automation of Electric Power Systems, 2014(24):48-55.
[15]史保壮,MAC,DOWELL J,PIWKO R,et al.风电并网技术的新进展[J].电力设备,2008,9(11):20-23.SHI Baozhuang, MACDOWELL J,PIWKO R,et al. New progress of technology for wind power access to power grid[J].Electrical Equipment,2008,9(11):20-23.