Voltage and Reactive Power Coordination Optimization Control Method of UHV DC Latching Receiving Network

Once DC lock-in occurs in a large capacity UHV DC transmission system, the power flow will shift in a large range and the system voltage will fluctuate violently. If the reactive voltage bracing capacity of the receiving AC system is insufficient, the voltage of the receiving end network will be seriously affected Level, even resulting in receiving terminal voltage collapse. Therefore, voltage stabilization control for DC locking has a crucial effect on the stability of the system. This paper first introduces the concept of voltage-reactive sensitivity. Based on this, a reactive power coordination optimistic method for the whole network and critical regions considering reactive voltage sensitivity is proposed respectively, and the realization of control scheme is also introduced.. Finally, the effectiveness of the reactive power optimization control strategy is verified by a province net example.