基于变功率因数的分散式风电场优化运行策略
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摘要
提出一种考虑负荷类型和风电机组无功极限的分散式风电场优化运行策略。建立基于静态电压特性的典型负荷通用模型;挖掘分散式风电机组无功能力,采用机端并联电容器平衡并提高双馈感应发电机无功调节能力;分析风电机组功率因数对配电网各节点电压、有功和无功网损影响规律;在此基础上,提出基于改进萤火虫算法的分散式风电场最优功率因数运行方法。基于IEEE-33节点模型进行仿真计算,结果表明:分散式风电场小范围功率因数优化调节可有效减小配电网网损,提高电压稳定性。
In this paper,an optimal operation strategy for dispersed wind farms(DWF)is proposed considering load types and reactive power capabilities of wind turbines. The generalized load model based on the static voltage characteristics is introduced. Reactive power capabilities of DWFs are discussed and enhanced,where the reactive power capabilities of doubly-fed induction generator are balanced and improved by installing proper capacitors at the stator. The influences of DWFs with variable power factor on network loss and voltage profile are presented. On this basis,optimal power factor regulation of DWFs based on improved firefly algorithm is proposed. Results in the benchmark IEEE-33 node system indicate that power factor regulation of DWFs in a small range could effectively reduce network loss and enhance voltage stability.
In this paper,an optimal operation strategy for dispersed wind farms(DWF)is proposed considering load types and reactive power capabilities of wind turbines. The generalized load model based on the static voltage characteristics is introduced. Reactive power capabilities of DWFs are discussed and enhanced,where the reactive power capabilities of doubly-fed induction generator are balanced and improved by installing proper capacitors at the stator. The influences of DWFs with variable power factor on network loss and voltage profile are presented. On this basis,optimal power factor regulation of DWFs based on improved firefly algorithm is proposed. Results in the benchmark IEEE-33 node system indicate that power factor regulation of DWFs in a small range could effectively reduce network loss and enhance voltage stability.
引文
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[3]安军,张师,穆钢,等.双馈风电场有功分配方式对风火打捆系统暂态稳定性的影响[J].太阳能学报,2017,38(5):1391-1396.[3]An Jun,Zhang Shi,Mu Gang,et al.Study of DFIGfarm real power dispatching mode influence on transient stability of wind-thermal bundled power system[J].Acta Energiae Solaris Sinica,2017,38(5):1391-1396.
[4]王振浩,葛津铭,李国庆,等.改善风电场群并网地区电压稳定的无功协调控制的研究[J].太阳能学报,2017,38(4):983-990.[4]Wang Zhenhao,Ge Jinming,Li Guoqing,et al.Research of reactive power coodinated control to improve voltage stability in on-grid region of clastered wind farms[J].Acta Energiae Solaris Sinica,2017,38(4):983-990.
[5]李丽霞,姚兴佳,王晓东,等.双馈风电场新型无功优化分配策略研究[J].太阳能学报,2017,38(5):1397-1404.[5]Li Lixia,Xiao Xingjia,Wang Xiaodong,et al.An optimal reactive power dispatch strategy for interiorpoint method based wind farms[J].Acta Energiae Solaris Sinica,2017,38(5):1397-1404.
[6]卓毅鑫,林湘宁,李正天,等.基于概率分析的风电场电压跌落评估方法研究[J].太阳能学报,2017,38(3):676-683.[6]Zhuo Yixin,Lin Xiangning,Li Zhengtian,et al.Wind farm voltage dips risk assessment based on probabilistic methodology[J].Acta Energiae Solaris Sinica,2017,38(3):676-683.
[7]陈家俊,蒋铁铮,周勇,等.考虑电压骤降的分布式电源定容选址[J].电网技术,2014,38(8):2244-2249.[7]Chen Jiajun,Jiang Tiezheng and Zhou Yong,et al.Reasonable allocation of distributed generation in distribution system considering voltage sag[J].Power System Technology,2014,38(8):2244-2249.
[8]Guo Wentao,Liu Feng,Si Jennie,et al.Approximate dynamic programming based supplementary reactive power control for DFIG wind farm to enhance power system stability[J].Neurocomputing,2015,170:417-427.
[9]Kim Jinho,Seok Jul-Ki,Muljadi Eduard,et al.Adaptive Q-V scheme for the voltage control of a DFIG-Based wind power Plant[J].Power electronic,2016,31(5):3586-3599.
[10]Ghennam T,Aliouane K,Ake F l,et al.Advanced control system of DFIG based wind generators for reactive power production and integration in a wind farm dispatching[J].Energy Conversion and Management,2015,105:240-250.
[11]高红均,刘俊勇,考虑不同类型DG和负荷建模的主动配电网协同规划[J].中国电机工程学报,2016,36(18):4911-4922.[11]Gao Hongjun,Liu Junyong.Coordinated planning considering different types of DG and load in active distribution network[J].Proceedings of the CSEE,2016,36(18):4911-4922.
[12]Othman M M,El-Khattama Walid,Hegazy Y G,et al.Optimal placement and sizing of voltage controlled distributed generators in unbalanced distribution networks using supervised firefly algorithm[J].Electrical Power and Energy Systems,2016,82(2):105-113.