光伏电站参与电网频率调节技术的研究Research on Grid Frequency Regulation Technology of Photovoltaic Power Plant
朱岚康,单宝旭,隋本刚
ZHU Lankang,SHAN Baoxu,SUI Bengang
摘要(Abstract)：
由于光伏出力具有不确定性,光伏的大量接入给电网的稳定性造成不利影响。为此,针对光伏并网点频率波动问题,提出2种不同的控制策略:第一种是光伏发电单元参与调频,当并网点检测到频率波动时,将频率偏差作为控制量,通过下垂控制得到功率偏差,依据此偏差量调节MPPT(最大功率点跟踪)输出的直流电压量,反馈到逆变器双环控制,从而调节光伏阵列的输出功率;第二种是场站级控制系统参与调频,即通过测量系统频率偏差得到功率控制指令,再由场站级功率控制系统将其下发至相关逆变器完成频率控制。最后,通过系统仿真对比了2种控制策略的优缺点及适用性。
Large-scale access of photovoltaic power plants poses challenges to the stability of power grid because of its output uncertainty. Therefore, the paper proposes two control strategies in view of frequency fluctuations at PV integration points. First, the PV generation unit involves in frequency regulation. When the frequency fluctuation is detected on integration point, frequency deviation is taken as control quantity, and power deviation is concluded via droop control. According to the deviation, DC voltage of the MPPT output is adjusted and fed back to dual loop control of inverter to adjust output power of PV array. Second, station-level control system involves in frequency regulation. The power control order is obtained via measurement system frequency deviation, and then the control order is sent to inverters for frequency regulation. Finally,merits, demerits and applicability of the strategies are compared through system simulation.
关键词(KeyWords)：
光伏电站;频率调节;光伏单元;场站级控制系统
PV power station;frequency regulation;photovoltaic unit;station-level control system
基金项目(Foundation):
作者(Author):
朱岚康,单宝旭,隋本刚
ZHU Lankang,SHAN Baoxu,SUI Bengang
DOI: 10.19585/j.zjdl.201906020
参考文献(References)：
- [1]丁明,王伟胜,王秀丽,等.大规模光伏发电对电力系统影响综述[J].中国电机工程学报,2014,34(1):1-14.
- [2]XIN H H,LIU Y,WANG Z,et al.A new frequency regulation strategy for photovoltaic systems without energy stor age[J].IEEE Transactions on Sustainable Energy,2013,4(4):985-993.
- [3]KAKIMOTO N,TAKAYAMA S,SATOH H,et al.Power modulation of photovoltaic generator for frequency control of power system[J].IEEE Transactions on Energy Conversion,2009,24(4):943-949.
- [4]ZARINA P P,MISHRA S,SEKHAR P C.Photovoltaic system based transient mitigation and frequency regulation[C]//2012 Annual IEEE India Conference(INDICON2012).Piscataway:IEEE Press,2012:1245-1249.
- [5]苏建徽,余世杰,赵为,等.硅太阳电池工程用数学模型[J].太阳能学报,2001,22(4):409-413.
- [6]魏伟,许胜辉.光伏并网逆变器的研究[J].电力电子技术,2008,42(11):43-44.
- [7]张剑,孙元章.三相单级光伏并网系统对配电网侧负荷建模的影响[J].电力系统自动化,2011,35(2):73-78.
- [8]杨明.大型光伏电站逆变器并网控制策略及稳定性分析[D].重庆:重庆大学,2014.
- [9]蒋小亮,丁岩,全少理,等.光伏渗透率对电力系统频率影响及控制策略[J].武汉大学学报(工学版),2015,48(5):686-670.
- [10]钟旭.光伏并网发电系统有功无功综合控制研究[D].成都:西南交通大学,2011.
- [11]赵蓓.大型光伏电站并网频率控制策略研究[D].北京:华北电力大学,2015.
- [12]EKANAYAKE J,JENKINS N.Wind Comparisons of the response of doubly fed and fixed-speed turbines to changes in network frequency[J].IEEE Transactions on Energy Conversion,2004,19(4):800-802.
- [13]ALMEIDA R G,LOPSE J A.Participation of doubly fed induction wind generators in system frequency regulation[J].IEEE Transactions on Power Systems,2007,22(3):944-950.
- [14]CHANG CHIEN L R,LIN W T,YIN Y C.Enhancing frequency response control by DFIG in the high wind pene trated power systems[J].IEEE Transactions on Power Systems,2011,26(2):710-718.
- [15]薛迎成,宋凯,熊宁.基于分层架构的风电场频率调节策略[J].华东电力,2010(3):402-407.