基于最优潮流并计及静态电压稳定性约束的区域间可用输电能力计算

OPF BASED ATC CALCULATION WITH STATIC VOLTAGE STABILITY CONSTRAINTS

可用输电能力(ATC)是衡量电力系统在安全稳定运行的前提下区域间功率交换能力的指标。文中基于最优潮流(OPF)方法,建立起符合电力市场交易机制的ATC计算模型,其中考虑到输电线路故障对系统静态电压稳定性的影响,加入线路N-1故障时广义参数化形式的潮流方程及相应的不等式约束条件,使系统在故障时仍有负荷裕度,以保持电压稳定;以支路功率和系统负荷裕度之间的灵敏度指标进行预想故障选择,并用原对偶内点法计算得到输电线路N-1安全约束下的区域间可用输电能力。IEEE30和IEEE118节点系统算例表明该模型和算法的正确性与有效性。

Available Transfer Capability (ATC) is a measure to evaluate the electric power exchange among areas in a reliable manner. An OPF-based ATC calculation model accord with the trade mechanism in electricity market was set up. To avoid the impact of branch outage contingency on system's voltage stability, generalized parameterization power flow equations and corresponding inequality constraints under branch outage contingency was included in the model. By this means the power system can maintain an adequate voltage stability loading margin. Contingency selection was performed through sensitivity indices between branch flows and the system loading margin. ATC with N-1 security constraints was calculated by primal-dual interior point methods. The results of IEEE 30-bus and 118-bus systems show that the proposed model and method are valid.