摘要
大量三相不平衡设备的并网将导致三相电压不平衡,严重威胁配电网的电能质量。除专用电能质量治理设备外,利用配电网中光伏变流器的剩余容量进行不平衡电压的治理是抑制电能质量污染的有效方法。文中提出了利用三相分布式光伏变流器治理并网点不平衡电压的最优控制策略。首先,将治理后并网点不平衡电压最小化的问题建模为一个考虑电路定理、电流限幅、功率平衡、功率振荡的优化问题;其次,分析了该问题物理约束的几何性质,得到了不同条件下可行域的边界和最优点的取值;然后,据此设计了最小化并网点负序电压的控制策略,该控制策略的实现不依赖电网阻抗信息,并可以保证光伏阵列输出最大可用功率;最后,通过硬件在环实验验证了所提控制方法的有效性。
The integration of large number of three-phase unbalanced devices into the power grid leads to three-phase voltage unbalance issues,which seriously threaten the power quality of the distribution network.In addition to the specialized power quality mitigation equipment,using the residual capacity of the photovoltaic(PV)converter in the distribution network to mitigate unbalanced voltage is an effective way to suppress power quality pollution.This paper proposes an optimal control strategy for mitigating unbalanced voltage at the point of common coupling(PCC)by using three-phase distributed PV converter.First,the minimization problem of unbalanced voltage at the PCC after mitigation is modeled as an optimization problem considering circuit theorem,current limiting,power balance,and power oscillation.Secondly,the geometric properties of the physical constraints for the problem are analyzed,and the boundary of the feasible region and the optimal value are obtained under various conditions.Then,the corresponding control strategy is designed to minimize the negative-sequence voltage at the PCC.The implementation of the control strategy does not require the power grid impedance information while the maximum output power of the PV array can be guaranteed.Finally,the effectiveness of the proposed control method is verified by the hardware-in-the-loop(HIL)experiment.
作者
唐雅洁
冯启帆
龚迪阳
林达
李志浩
夏杨红
TANG Yajie;FENG Qifan;GONG Diyang;LIN Da;LI Zhihao;XIA Yanghong(Electric Power Research Institute of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310014,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)
出处
《电力系统自动化》
2025年第18期182-194,共13页
Automation of Electric Power Systems
基金
国网浙江省电力有限公司科技项目:“高渗透率分布式光伏并网主动支撑及运行控制技术研究与应用”(5211DS230003)。
关键词
配电网
电能质量
电压不平衡
光伏变流器
负序电压
治理
并网点
distribution network
power quality
voltage unbalance
photovoltaic converter
negative-sequence voltage
mitigation
point of common coupling(PCC)
作者简介
唐雅洁(1993-),女,硕士,工程师,主要研究方向:新能源功率预测、分布式光伏运行与控制。E-mail:tyj_11@163.com;通信作者:冯启帆(1999-),男,博士研究生,主要研究方向:分布式光伏发电、配电网电能质量。E-mail:12110032@zju.edu.cn;龚迪阳(1993-),男,硕士,工程师,主要研究方向:分布式电源及微网、人工智能应用。E-mail:diyang915@outlook.com。
