适用于MMC-MTDC的自适应斜率平坦控制策略
发布时间：2018-08-12 18:14
【摘要】：为了维持模块化多电平换流器多端直流输电系统的电压稳定及换流站间功率的平衡,提出一种基于微分平坦理论的自适应斜率控制策略。控制器分为前馈双环控制和动态误差反馈控制:前馈控制根据系统期望平坦输出参考轨迹和系统状态变量及输入变量之间的函数关系,得到控制系统的主导控制量;误差线性反馈控制可以消除系统扰动和外界干扰对规划轨迹的影响,增强系统响应速度和稳态暂态特性。最后建立五端MMC-MTDC模型,分别在稳态潮流翻转和主站故障退出2种工况下进行仿真验证。结果表明该控制策略可以根据电压变化方向及换流站裕度对下垂曲线斜率实时控制,避免换流站满载甚至过载运行,达到各个换流站之间功率的最优分配。
[Abstract]:In order to maintain the voltage stability of modularized multilevel converter multiterminal HVDC transmission system and the balance of power between converter stations, an adaptive slope control strategy based on differential flatness theory is proposed. The controller is divided into feedforward double loop control and dynamic error feedback control. The feedforward control obtains the dominant control quantity of the control system according to the function relationship between the system expected flat output reference trajectory and the system state variables and input variables. The error linear feedback control can eliminate the influence of system disturbance and external disturbance on the planning trajectory and enhance the system response speed and steady-state transient characteristics. Finally, a five-terminal MMC-MTDC model is established, which is simulated under two conditions of steady power flow reversal and main station fault exit respectively. The results show that the control strategy can real-time control the slope of the sag curve according to the direction of voltage change and the margin of converter station, avoid the full-load or even overload operation of converter station, and achieve the optimal distribution of power among different converter stations.
【作者单位】： 华东交通大学电气与自动化工程学院;
【基金】：国家自然科学基金(51367008)~~
【分类号】：TM46;TM721.1
[Abstract]:In order to maintain the voltage stability of modularized multilevel converter multiterminal HVDC transmission system and the balance of power between converter stations, an adaptive slope control strategy based on differential flatness theory is proposed. The controller is divided into feedforward double loop control and dynamic error feedback control. The feedforward control obtains the dominant control quantity of the control system according to the function relationship between the system expected flat output reference trajectory and the system state variables and input variables. The error linear feedback control can eliminate the influence of system disturbance and external disturbance on the planning trajectory and enhance the system response speed and steady-state transient characteristics. Finally, a five-terminal MMC-MTDC model is established, which is simulated under two conditions of steady power flow reversal and main station fault exit respectively. The results show that the control strategy can real-time control the slope of the sag curve according to the direction of voltage change and the margin of converter station, avoid the full-load or even overload operation of converter station, and achieve the optimal distribution of power among different converter stations.
【作者单位】： 华东交通大学电气与自动化工程学院;
【基金】：国家自然科学基金(51367008)~~
【分类号】：TM46;TM721.1
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