基于等效网络的过网损耗计算实用化方法

Practical Algorithm for Wheeling Loss Based on Equivalent Network

在电力市场下,省级电网间的转运交易是一种重要的电能贸易形式。文中提出一种基于等效网络的过网损耗实用化计算方法。该方法将转运交易等效为提供转运服务的省网内的发电节点和负荷节点,将损耗计算的范围缩小至等效网络,利用潮流追踪法进行损耗分摊。其中,转运交易对等效发电机和等效负荷提供出力的份额,根据联络线功率对转运交易功率的灵敏度计算得出。对具有775母线的三个省级电网中的转运交易进行了过网损耗计算。结果表明,该方法简便、快捷,除潮流计算外无需过多的附加计算,具有实用意义。

In the electris power market, wheeling transaction between provincial networks is an important electricity trade form. A practical algorithm for determining wheeling losses based on an equivalent network is proposed in this paper. The equivalent network consists of generator nodes, load nodes and a transmission network providing wheeling service. In the equivalent network, power flow tracing method is used to calculate nodes losses. Meanwhile, the power of equivalent generator and load nodes shared with wheeling transactions can be determined through the sensitivity of tie line power to wheeling power. The proposed algorithm is adopted on a 775-buses system. The results show that the algorithm is easy and efficient, with only once power flow calculating and tracing.