基于谐波约束的配电网光伏最大准入容量计算

Maximum Penetrating Capacity Computing of Photovoltaic Power Generation Based on Harmonic Constraint in Distributed Generation

首先,分析了光伏逆变器产生的谐波特点,并根据不同光伏装机容量产生的谐波注入电流计算了谐波潮流,建立了谐波评估模型。其次,建立了以节点电压和线路传输功率等限制因素影响下的最大准入容量计算模型,并结合谐波评估结果给出最佳配置模式。最后,通过算例计算,得出了配电网中分布式光伏接入位置对接入容量影响的规律,并通过计算得出了综合考虑光伏接入容量和谐波畸变率大小的最佳光伏接入位置。

In this paper, the harmonic characteristic from PV inverter is analyzed. With the harmonic current contributed by different capacity, the harmonic power flow is calculated for making a harmonic evaluating model. Furthermore, a model of maximum penetrating capacity based on the voltage constraint, capacity constraint and harmonic constraint is proposed in order to deal with the best penetrating position. At last, a distribution network is used to investigate the relationship between capacity and position. Considering the harmonic distortion, the best position of PV in this network is found by this model.