高压并网分布式光伏发电系统SVG容量设计研究

Research on SVG Capacity for HV Distributed Photovoltaics System

高压并网分布式光伏发电系统并入用户原有系统后,减小了电网下行有功电度,从而降低了系统计量点的功率因数,需设置SVG补偿装置进行无功补偿。根据补偿目标不同提出实时满足功率因数要求、及满足电业功率因数月度考核要求的两种SVG容量计算方法。其中,基于满足电业功率因数月度考核要求的SVG容量计算方法,利用正弦函数模拟光伏系统输出功率曲线,SVG采用能补尽补策略,减小电网下行无功电度,使得电网下行月度有功及无功电度比值满足电业考核要求。经过工程实例计算及验证,该方法可满足电网对用户的月度功率因数考核要求。

After HV distributed photovoltaics system is integrated into the user’s system,the active consumption from power grid is reduced,thus reducing the power factor of the system.Therefore,SVG compensation devices need to be installed for reactive power compensation.Based on different compensation objectives,this paper proposes two sets of SVG capacity calculation methods,one based on meeting real-time power factor requirements and the other based on meeting monthly power factor assessments of power administration.Among them,the SVG capacity calculation method based on meeting the monthly power factor assessment uses sine functions to simulate the time curve of the photovoltaic system’s output power,and adopts the strategy of compensating as much as possible with SVG,so that reactive power consumption from power grid is reduced and the monthly active and reactive power ratio of the grid downstream meets the assessment requirements.After calculation and verification through engineering examples,it can meet the monthly power factor assessment requirements of the power grid for users.