并网光伏电站关口无功调节能力的分时段等值方法  

Time-based Equivalent Method for Reactive Power Regulation Capacity of Grid-connected Photovoltaic Plant

作　　者：覃海 陈胜 张洪略 夏天 马覃峰 段展宇 颜伟[2] QIN Hai;CHEN Sheng;ZHANG Honglue;XIA Tian;MA Qinfeng;DUAN Zhanyu;YAN Wei(Power Dispatching Control Center of Guizhou Power Grid Co.,Ltd.,Guiyang 550002,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China)

机构地区：[1]贵州电网有限责任公司电力调度控制中心,贵州贵阳550002 [2]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《中国电力》2024年第2期27-33,共7页Electric Power

基　　金：中国南方电网有限责任公司科技项目(GZKJXM20210372)。

摘　　要：现有并网光伏电站关口无功调节能力等值方法未考虑站内电压安全约束、并网点电压和光伏出力的波动影响,难以满足工程实际的调控管理要求,为此,提出一种并网光伏电站关口无功调节能力的分时段等值方法,为工程实际调控管理提供决策依据。在给定关口电压和光伏出力的条件下,考虑光伏电站内部静止无功发生器、光伏单元无功调节能力及其无功调节上下限要求,提出光伏电站关口无功最大调节范围的优化等值方法,确定光伏电站关口无功调节能力与其有功出力、关口电压的关系;同时,考虑关口电压和光伏出力波动的时段特性,通过相似日波动阈值的区域图时段融合策略,实现光伏电站关口无功调节能力的分时段等值。以实际光伏电站的仿真分析验证了所提方法的有效性。The existing equivalent methods for reactive power regulation capacity of grid-connected photovoltaic(PV)plant do not take into account the voltage security constraints in the plant and the impacts of random fluctuations of grid-connected voltage and photovoltaic output,which makes it hard to meet the requirements of actual engineering.For this reason,a time-based equivalent method for reactive power regulation capacity of grid-connected PV plant is proposed,which can provide an effective decisionmaking basis for actual engineering management.Firstly,under the given gate voltage and PV output,and with consideration of the static var generator within the PV plant,the reactive power regulation capacity of the PV unit and the upper&lower limits of the reactive power regulation range,an optimal equivalent method for maximum gate reactive power regulation capacity of PV plant is proposed to determine the relationship between the gate reactive power regulation capacity of the PV plant and its active output and gate voltage.Secondly,considering the time period characteristics of the gate voltage and PV output fluctuations,the time-based equivalent scheme for reactive power regulation capacity of PV station is realized through the time period fusion strategy for fluctuation thresholds of similar days.Finally,the simulation analysis of an actual PV plant verified the effectiveness of the proposed method.

关 键 词：光伏电站 无功调节能力 分时段等值 无功优化 

分 类 号：TM615[电气工程—电力系统及自动化]