电力系统自动化2017，Vol.41Issue(11)：92-98,7.
考虑电源线电压控制特性的不接地配电网改进三相潮流模型
Improved Three-phase Power Flow Model for Ungrounded Distribution Network Considering Controllability of Line-to-line Voltage
摘要
Abstract
Ungrounded distribution networks have two main features: 1) there is no path for zero-sequence current;2) the endpoint element either has no neutral point or, even if with one, is without a neutral line.Because of the first feature, zero-sequence input current of an endpoint must be equal to 0, and because of the absence of neutral point or neutral line, the endpoint element is characterized by immeasurability of the phase-neutral point voltage or inadvisability of control on the phase-to-ground voltage.Therefore, the endpoint of power source in an ungrounded distribution network usually takes the line-to-line voltage as the objects of measurement and control rather than the phase-to-ground/phase-to-neutral point voltage of the endpoint in an actual ungrounded distribution network, which is called the line-to-line voltage controllability.By taking both features into consideration, this paper tries to improve the existing three-phase power flow model for ungrounded distribution network.First, an equivalent neutral point of the slack node is obtained and treated as the common reference point for phase voltages to serve as an improved model for the slack node.Then an improved model for active power-voltage node with the total active input power and line-to-line voltages as control objects is proposed based on the two watt-meter method.Finally, the improved three-phase power flow model with line-to-line voltage controllability and wye-connected/delta-connected load is proposed.The modified IEEE 13-bus distribution network is tested to verify the improved three-phase load model proposed.关键词
配电网/三相潮流/平衡端点/有功功率-电压端点/线电压控制特性/等值中性点Key words
distribution network/three-phase power flow/slack node/active power-voltage node/controllability of line-to-line voltage/equivalent neutral point引用本文复制引用
罗兰,赵霞,颜伟,余娟..考虑电源线电压控制特性的不接地配电网改进三相潮流模型[J].电力系统自动化,2017,41(11):92-98,7.基金项目
国家自然科学基金资助项目(51307186).This work is supported by National Natural Science Foundation of China (No.51307186). （51307186）
