| 引用本文: | 陈家超,李钦豪,唐渊,张勇军.考虑光伏选相投切的低压配电网三相平衡优化[J].电力自动化设备,2022,42(4): |
| CHEN Jiachao,LI Qinhao,TANG Yuan,ZHANG Yongjun.Three-phase balance optimization of low-voltage distribution network considering photovoltaic phase selection and switching[J].Electric Power Automation Equipment,2022,42(4): |
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| 摘要: |
| 单相光伏电源的接入通常会引起低压配电网(LVDN)的三相不平衡度增大。针对当前负荷换相困难以及光伏协调控制在三相四线制LVDN中的适用性问题，提出了LVDN三相平衡优化模型。基于三相四线制系统的节点导纳矩阵，以注入电流不平衡量建立LVDN的潮流方程，以三相不平衡度最小为目标，建立考虑光伏选相投切、光伏逆变器无功调节和储能有功调节的三相平衡协调优化控制模型；采用区间约束描述光伏出力的不确定性，连续化逻辑变量以降低三相四线制LVDN模型的求解难度。采用通用代数建模系统进行建模仿真并求解，仿真结果表明所提优化方法能有效降低LVDN的三相不平衡度以及网损。 |
| 关键词: 分布式光伏 选相 三相不平衡 低压配电网 三相四线制 |
| DOI：10.16081/j.epae.202201005 |
| 分类号:TM71;TM615 |
| 基金项目:国家自然科学基金资助项目(51777077)；广州市科技计划项目(202102021208) |
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| Three-phase balance optimization of low-voltage distribution network considering photovoltaic phase selection and switching |
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CHEN Jiachao, LI Qinhao, TANG Yuan, ZHANG Yongjun
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Research Center of Smart Energy Technology, School of Electric Power, South China University of Technology, Guangzhou 510640, China
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| Abstract: |
| The access of single-phase photovoltaic power supply usually causes the increase of unbalance degree of LVDN(Low-Voltage Distribution Network). Aiming at the current difficulties of load commutation and the applicability of photovoltaic coordinated control in three-phase four-wire LVDN, the three-phase balance optimization model of LVDN is proposed. Based on the node admittance matrix of three-phase four-wire system, the power flow equation of LVDN is established with the injection current unbalance. With the objective of minimizing the three-phase unbalance degree, the three-phase balance coordinated optimization control model is established considering the photovoltaic phase selection and switching, the reactive power regulation of photovoltaic inverter and the active power regulation of energy storage. Interval constraints are used to describe the uncertainty of photovoltaic output, and the continuous logic variables are used to reduce the difficulty of solving the three-phase four-wire LVDN model. The general algebraic modeling system is used for modeling, simulation and solution. The simulative results show that the proposed optimization method can effectively reduce the three-phase unbalance degree and network loss of LVDN. |
| Key words: distributed photovoltaic phase selection three-phase unbalance low-voltage distribution network three-phase four-wire |
