基于暂态数学模型的VSC-HVDC功率控制系统研究

Research on Power Control of VSC-HVDC Model Based on Transient Mathematical Model

介绍了VSC-HVDC系统的工作原理,在dq_0坐标下建立了VSC-HVDC的暂态数学模型,并且设计了电压源型换流器(VSC)传输功率控制系统。对于一个基于VSC的直流输电系统,为了保持系统有功功率的平衡,需有一端采用定直流电压控制。在此基础上实现了VSC-HVDC系统一端定电压控制、另一端定功率控制的运行方式,并利用仿真软件PSCAD/EMTP对所设计的控制系统进行了验证。结果表明,所设计的控制系统具有优良的控制性能,并且具有一定的暂态稳定性。

This paper introduces VSC-HVDC system briefly, dqO coordinates, and designs voltage source converter （VSC） builds the transient mathematical model of the VSC-HVDC system in transmission power control system. For a VSC based DC transmission system, it is necessary to use a constant DC voltage control in one end for keeping system active power balance. This article realizes constant voltage control in one end and constant power control in the other end in VSC-HVDC system, and then uses simulation software PSCAD / EMTP to simulate and verify the model. Simulation results show that the proposed control strategy is of perfect effectiveness and a certain degree of transient stability.