基于ADPSS大区电网混合仿真的直流系统辅助控制建模

摘要:

在基于ADPSS 的大区交直流电网混合仿真中，直流输电控制模型不够完善，影响直流系统的运行特性。对直 流控制器原理进行研究，探讨了直流系统无功消耗、关断角、换相角、直流电流等变量之间相互关系，利用程序自定义 功能，建立了考虑分接头调整和无功补偿装置投切联合控制的直流辅助控制模型。仿真分析了大区电网直流功率提 升时辅助控制模型的动作特性，验证了模型的正确性和有效性。仿真结果表明，辅助控制模型能够维持换流站的无 功平衡，将直流运行参数控制在合理范围内，减少“换相失败”发生的风险，适用于大规模电网的运行特性和协调控制 研究。

Abstract:

The inadequate model of control system for HVDC affects the operation condition of DC system negatively in hybrid simulation of large － scale AC/DC power systems on the basis of advanced digital power system simulator ( ADPSS) ． After the research of the principle of DC controller and the relations among such variables as reactive power consumption，extinction angle， commutation angle and DC current，the auxiliary control model of DC system considering the combined control of tap changer adjustment and reactive power compensation device switching is established using the user － defined model ( UDM) function provided by the software． The auxiliary control behavior during DC power increasing is analyzed in the simulation to verify the correctness and effectiveness of the proposed model． The simulation results show that the auxiliary control model can sustain the balance of reactive power in converter station and restrict DC operating parameters to a reasonable range so as to reduce the risk of " commutation failure" ，which is suitable for the research of operating characteristics and coordinated control strategy of large － scale power grid．