矩差分析理论及其在配电网最小弃光决策中的应用  

Moment Difference Analysis Theory and Its Application in Photovoltaic Curtailment Minimizing Decision for Distribution Networks

作　　者：吴俊勇[1] 王燚 WU Junyong;WANG Yi(School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学电气工程学院,北京市100044

出　　处：《电力系统自动化》2024年第20期91-99,共9页Automation of Electric Power Systems

摘　　要：高比例分布式光伏接入配电网会导致潮流返送和电压越限等一系列问题,严重威胁到配电网的安全运行。文中提出了含分布式光伏配电网的矩差分析理论,将配电网对分布式光伏的消纳问题转化成恢复和维持矩差方程的平衡问题。对一个给定的配电网,当最高节点电压等于规定的电压上限时,光伏矩减去负荷矩的矩差近似为一个常数,称为临界矩差。临界矩差代表了配电网对分布式光伏消纳能力的极限,光伏矩才是配电网需要消纳的对象,而负荷矩是消纳光伏矩的资源。基于矩差分析理论提出了配电网分布式光伏的最小弃光决策,并应用于某10 kV单分支配电线路以及12.66 kV的IEEE 33节点多分支配电网的分析计算。算例表明,所提的最小弃光决策在误差不大于1.2%条件下,寻优速度提高了2877倍,验证了该方法的正确性和快速性。The integration of high proportion of distributed photovoltaic(PV)into distribution networks can lead to a series of problems such as reverse power flow and voltage violations,posing a serious threat to the safe operation of distribution networks.This paper introduces the theory of moment difference analysis for distributed PV distribution networks,transforming the problem of distributed PV accommodation in distribution networks into a balance problem of restoring and maintaining moment difference equations.For a given distribution network,when the maximum node voltage reaches the specified voltage upper-limit,the moment difference between PV moment and load moment,termed as critical moment difference,approximates to a constant.The critical moment difference represents the ability limit of a distribution network in accommodating distributed PV,where PV moments are the entities that need to be accommodated in distribution networks,and load moments serve as resources for accommodating PV moments.Based on the moment difference analysis theory,the PV curtailment minimizing decision for distributed PV in distribution networks is proposed and applied to the analysis and calculation of a 10 kV single-branch distribution line,and a 12.66 kV multi-branch distribution network in the IEEE 33-node system.Results of the case studies show that the proposed PV curtailment minimizing decision improves the optimization speed by 2877 times under the condition of an error of no more than 1.2%,verifying the correctness and rapidity of the method.

关 键 词：配电网 分布式光伏 光伏矩 负荷矩 临界矩差 最小弃光决策 

分 类 号：TM615[电气工程—电力系统及自动化]