电采暖与光伏规模化接入低压农网的电压分析

Voltage Analysis of Rural Low-voltage Distribution Network Connected with Massive Electric Heating and Photovoltaic

规模化电采暖和光伏接入对低压农网电压产生叠加影响,分析其影响对指导低压农网的规划设计和运维改造具有重要意义。首先,根据建筑物热力学原理建立房屋热需求模型,结合不同类型电采暖用电行为特性,推导出其在不同运行模式下的用电模型;然后,针对低压农网特点提出5种评价电压质量指标;接着,按不同配置方式和不同运行模式构建多种场景,由实际气象数据生成电采暖和光伏的功率曲线,采用OpenDSS软件进行潮流计算得出各指标量值;最后,对典型低压农网进行算例分析,得出低压农网电压情况,并分析了光伏和电采暖不同配置及运行模式对低压农网的电压影响。

The connection of massive electric heating(EH)and photovoltaic(PV)has overlapping effects on the volt⁃age of rural low voltage(LV)distribution network,and the corresponding analysis is of significance for its planning and operation.In this paper,the heat demand model of a building is built according to the principle of building thermody⁃namics,and the electricity demand models of EH in different operating modes are derived.Five indices of voltage quali⁃ty evaluation for the rural LV distribution network are presented,and a variety of scenarios are constructed based on dif⁃ferent configuration modes and operation modes of EH.According to the actual meteorological data,the power curves of both EH and PV are generated,with which the power flows are calculated to obtain different indices using OpenDSS.A typical rural LV distribution network is analyzed as a case study,whose voltage profile is obtained.In addition,the in⁃fluences of different configurations and operation modes of PV and EH on its voltage are also analyzed.