基于无功能力考虑的配电系统可靠性评估

Reliability Evaluation of Distribution System Based on Consideration of Reactive Power Capability

提出了一种考虑电网区域无功能力的配电系统可靠性评估方法。通过建立区域电网无功能力的数学模型,定义了无功能力的指标,并考虑了电压稳定性、节点电压水平和热稳定等安全约束条件。进而计算出无功能力参数的不确定性对配电系统可靠性的影响。考虑到网络运行条件对无功能力的影响,通过运用原始-对偶内点法计算确定网络运行时的状态。并在系统当前运行情况下模拟多种"N-1"故障,进行了验证仿真,最后在此条件下进行配电系统可靠性评估。算例中,分析了无功能力参数不确定的条件下对配电系统可靠性评估的影响,证明了此方法的有效性、可行性和实用性。

A reliability evaluation method of distribution network considering the regional reactive power capability is proposed.By establishing the mathematical model of regional network reactive power capability,the index of reactive power capability is defined,and the security constraints of the voltage stability,node voltage level and thermostability etc.are considered.And then the influence of the uncertainty of the reactive power capability parameters on the reliability of distribution system is calculated.The influence of network operating conditions on reactive power capability is considered,and the condition of network operation is calculated and determined with primal-dual interior point method.In the current operating condition of the system,several ＂N-1＂ faults are simulated and verified.Finally,the reliability evaluation of distribution system is carried out in this condition.In the example,the influence on the reliability of distribution system under the uncertain reactive power capability parameters is analyzed,which proves its effectiveness,feasibility and practicality.