计及分布式电源转供能力的配电网供电能力计算

随着分布式电源的广泛接入,其对配电网供电能力的影响日趋重要,而目前配电网供电能力计算模型中尚未计及变电站低压母线上分布式电源的转供能力。为精确分析分布式电源转供能力对配电网供电能力的影响,首先根据分布式电源特性建立计及分布式电源转供能力的配电网最大供电能力计算模型;然后针对模型中遇到的最优化求解问题,引入基于配电系统联络特征的解析化求解方法,提出基于馈线联络的网络拓扑简化思想;最后通过具体电网算例验证该模型和算法的正确性,并对结果进行校验分析,结果表明分布式电源接入可提升区域最大供电能力,加强配电系统应对N1故障的能力。

The Calculation of Total Supply Capability for Distribution Network Considering Load Transfer Capability of Distributed Generation

With the widely application of distributed generation(DG) and its increasing influence on power supply capability of distribution network, current calculation model of power supply capability for distribution network still does not consider the load transfer capability of DG that connected to low-voltage bus of substation. In order to analyze impacts of the load transfer capability of DG on total supply capability (TSC) for distribution network, the TSC analysis model for distribution network is proposed firstly by considering the load transfer capability of DG according to DGs types and characteristics. To solve the optimization problems in the model, the analytical method based on interconnection characteristics of distribution system is applied. Then topology simplification thought is put forward based on interconnections among feeders. Finally, the correctness of the model and algorithm is verified, and the results are checked and analyzed through the numerical example of a concrete distribution network. Simulation results show that the DG connected to distribution network can promote the regional TSC and strengthen the distribution system capability to prevent the N-1 fault.