应用序分量法的主动配电网三相潮流计算

Three-phase Power Flow Calculation for Active Distribution Network Using Sequential Component Method

随着分布式电源的迅速发展,传统配电网逐步转变为主动配电网,传统配电网的潮流算法已无法直接应用于日益复杂的配电系统潮流计算中。为此,提出一种应用序分量法的主动配电网三相潮流计算方法,该方法将主动配电网划分成树状连通网络、连接支路和节点注入3个部分,针对主动配电网中的环网,给出了连接支路序电流计算方法;针对各种分布式电源,根据其实际控制效果建立潮流计算模型;针对主动配电网中PV节点,给出了直接计算节点无功功率的计算式。该方法提高了环网的处理能力,具有较强的实用性与可操作性,使潮流计算更简洁。IEEE33节点系统算例验证了提出的潮流算法的有效性。

With the rapid development of distributed generations,the traditional distribution networks are transformed into active distribution networks(ADNs)gradually. As a result,the power flow algorithm for the traditional distribution network cannot be directly applied to the power flow calculation in an increasingly complex distribution system. To solve this problem,a three-phase power flow calculation method for ADN is presented using sequential component method,which divides the ADN into three parts,i.e.,connected tree network,connected branches,and node injection. For the looped network in the ADN,a method for calculating the sequence currents in the connected branches is given. For various distributed generations,the models of power flow calculation are established based on their actual control effects.For a PV node in the ADN,the formula for directly calculating its reactive power is given. This method improves the looped network’s processing capability and has strong practicability and operability,thus making the power flow calculation more concise. The effectiveness of the proposed method is verified by taking an IEEE 33-node system as an example.