基于高渗透率分布式光伏接入交直流配电网的场景,本文分析了柔性互联通道阻塞失效后配电网频率和电压的动态特性。为了增强故障后系统的暂态稳定性,本文综合考虑了光伏机组的主动调节能力,提出了具有灵活互联通道阻塞的单端配电网应急协调控制策略。首先,非故障通道在短时间内过载,然后电气距离等因素的综合影响,系统调频效果的响应时间和调整成本进行定量评估;根据评估结果,光伏和同步单元由“控制而不是跳闸”控制,最后,进行高频跳闸,基于“光伏第一”的原则。频率控制完成后,建立了系统的无功优化模型,并采用改进的禁忌粒子群算法进行求解,从而优化配电网节点的电压。最后,建立了等效仿真模型来验证协调控制策略。
Based on the scenario of high-penetration distributed photovoltaic connected to an AC/DC distribution network, this paper analyzes the dynamic characteristics of frequency and voltage in a distribution network after the
blocking failure of the flexible interconnection channel. In order to enhance the transient stability of the system after the fault, this paper comprehensively considers the active regulation ability of photovoltaic units, and puts forward an emergency coordinated control strategy for a single-ended distribution network with flexible interconnection channel
blocking. Firstly, the non-fault channel is overloaded for a short time, then the comprehensive influence of factors such as electrical distance, response time and adjustment cost on the frequency modulation effect of the system is quantitatively evaluated; according to the evaluation results, the photovoltaic and synchronous units are controlled by \"control instead of tripping\", and finally, the high-frequency tripping is carried out, based on the principle of \"photovoltaics first\". After the frequency control is completed, the reactive power optimization model of the system is established, and the improved tabu-particle swarm optimization algorithm is used to solve it, so as to optimize the voltage of the distribution network nodes. Finally, an equivalent simulation model is established to verify the coordinated control strategy.