The voltage source converter based high voltage direct current(VSC-HVDC)system is based on voltage source converter,and its control system is more complex.Also affected by the fast control of power electronics,oscilla...The voltage source converter based high voltage direct current(VSC-HVDC)system is based on voltage source converter,and its control system is more complex.Also affected by the fast control of power electronics,oscillation phenomenon in wide frequency domain may occur.To address the problem of small signal stability of the VSCHVDC system,a converter control strategy is designed to improve its small signal stability,and the risk of system oscillation is reduced by attaching a damping controller and optimizing the control parameters.Based on the modeling of the VSC-HVDC system,the general architecture of the inner and outer loop control of the VSCHVDC converter is established;and the damping controllers for DC control and AC control are designed in the phase-locked loop and the inner and outer loop control parts respectively;the state-space statemodel of the control system is established to analyze its performance.And the electromagnetic transient simulation model is built on the PSCAD/EMTDC simulation platform to verify the accuracy of the small signal model.The influence of the parameters of each control part on the stability of the system is summarized.The main control parts affecting stability are optimized for the phenomenon of oscillation due to changes in operation mode occurring on the AC side due to faults and other reasons,which effectively eliminates system oscillation and improves system small signal stability,providing a certain reference for engineering design.展开更多
针对含柔性直流输电(voltage source converter-high voltage direct current,VSC-HVDC)的交直流系统电压稳定性问题,开发出一种适用于含VSC-HVDC的交直流系统连续潮流程序,以负荷裕度指标分析VSC-HVDC系统有功功率传输方向、有功功率...针对含柔性直流输电(voltage source converter-high voltage direct current,VSC-HVDC)的交直流系统电压稳定性问题,开发出一种适用于含VSC-HVDC的交直流系统连续潮流程序,以负荷裕度指标分析VSC-HVDC系统有功功率传输方向、有功功率传输容量及换流站与交流系统无功功率交换量的变化对系统电压稳定性的影响。进而利用系统电压崩溃点处雅可比矩阵,推导出系统负荷裕度对VSC-HVDC有功功率控制参数和无功功率控制参数的灵敏度,并基于该灵敏度提出一种适用于改善系统电压稳定性的VSC-HVDC调控策略。最后,将所提方法应用于修改的68节点和IEEE118节点交直流系统,仿真结果验证了所提方法的正确性和有效性。展开更多
基金supported by Research on the Oscillation Mechanism and Suppression Strategy of Yu-E MMC-HVDC Equipment and System(2021Yudian Technology 33#).
文摘The voltage source converter based high voltage direct current(VSC-HVDC)system is based on voltage source converter,and its control system is more complex.Also affected by the fast control of power electronics,oscillation phenomenon in wide frequency domain may occur.To address the problem of small signal stability of the VSCHVDC system,a converter control strategy is designed to improve its small signal stability,and the risk of system oscillation is reduced by attaching a damping controller and optimizing the control parameters.Based on the modeling of the VSC-HVDC system,the general architecture of the inner and outer loop control of the VSCHVDC converter is established;and the damping controllers for DC control and AC control are designed in the phase-locked loop and the inner and outer loop control parts respectively;the state-space statemodel of the control system is established to analyze its performance.And the electromagnetic transient simulation model is built on the PSCAD/EMTDC simulation platform to verify the accuracy of the small signal model.The influence of the parameters of each control part on the stability of the system is summarized.The main control parts affecting stability are optimized for the phenomenon of oscillation due to changes in operation mode occurring on the AC side due to faults and other reasons,which effectively eliminates system oscillation and improves system small signal stability,providing a certain reference for engineering design.
文摘针对含柔性直流输电(voltage source converter-high voltage direct current,VSC-HVDC)的交直流系统电压稳定性问题,开发出一种适用于含VSC-HVDC的交直流系统连续潮流程序,以负荷裕度指标分析VSC-HVDC系统有功功率传输方向、有功功率传输容量及换流站与交流系统无功功率交换量的变化对系统电压稳定性的影响。进而利用系统电压崩溃点处雅可比矩阵,推导出系统负荷裕度对VSC-HVDC有功功率控制参数和无功功率控制参数的灵敏度,并基于该灵敏度提出一种适用于改善系统电压稳定性的VSC-HVDC调控策略。最后,将所提方法应用于修改的68节点和IEEE118节点交直流系统,仿真结果验证了所提方法的正确性和有效性。
