MMC-HVDC系统桥臂阻抗不对称模型预测控制
发布时间：2019-08-20 09:09
【摘要】：针对模块化多电平换流器柔性直流(modular multilevel converter-high voltage direct current,MMC-HVDC)输电系统桥臂阻抗不对称运行环流问题,推导了上、下桥臂阻抗不对称运行时子模块输出电压与桥臂电流特性,阐述了此时桥臂电流基频成分,指出了换流器环流成分含有直流分量、基频分量、二倍频分量以及三倍频分量,直流侧电流会产生波动;提出一种MMC-HVDC系统桥臂阻抗不对称环流抑制策略,该策略将比例-积分控制与有限控制集模型预测控制相结合,计算换流器所有开关状态下综合目标函数,根据环流抑制目标函数最小值和环流抑制补偿电平调节综合目标函数最小值对应的开关状态。该控制策略能够很好地抑制环流交流成分,减小了直流侧电流波动,使得桥臂阻抗不对称所在相上、下桥臂子模块输出电压之和基频分量、二倍频分量以及三倍频分量对称分布。仿真结果验证了所提控制策略的可行性和有效性。
[Abstract]:In order to solve the problem of asymmetrical operation circulation of bridge arm impedance in modular multilevel converter flexible DC (modular multilevel converter-high voltage direct current,MMC-HVDC transmission system, the output voltage and bridge arm current characteristics of upper and lower bridge arm impedance asymmetric operation are derived, the fundamental frequency components of bridge arm current are described, and it is pointed out that the circulation component of converter contains DC component, fundamental frequency component, double frequency component and triple frequency component. The current on the DC side will fluctuate. In this paper, a bridge arm impedance asymmetric circulation suppression strategy for MMC-HVDC system is proposed, which combines proportional integral control with finite control set model predictive control to calculate the integrated objective function in all switching states of the converter, and adjusts the switching state corresponding to the minimum value of the synthetic objective function according to the minimum value of the circulation suppression objective function and the circulation suppression compensation level. The control strategy can suppress the circulation AC component well, reduce the current fluctuation on the DC side, and make the symmetrical distribution of the sum fundamental frequency component, double frequency component and triple frequency component of the output voltage of the lower arm module on the phase where the impedance asymmetry of the bridge arm is located. The simulation results verify the feasibility and effectiveness of the proposed control strategy.
【作者单位】： 华北电力大学电气与电子工程学院;国网山东省电力公司济南供电公司;国网北京朝阳供电公司;国网沧州供电分公司;
【基金】：国家自然科学基金资助项目(51607069) 河北省自然科学基金资助项目(E2015502012) 中央高校基本科研业务费专项基金资助项目(2016MS88,2017MS091) 国家电网公司科技项目资助(SGHECZ00FCJS1700493)~~
【分类号】：TM721.1
[Abstract]:In order to solve the problem of asymmetrical operation circulation of bridge arm impedance in modular multilevel converter flexible DC (modular multilevel converter-high voltage direct current,MMC-HVDC transmission system, the output voltage and bridge arm current characteristics of upper and lower bridge arm impedance asymmetric operation are derived, the fundamental frequency components of bridge arm current are described, and it is pointed out that the circulation component of converter contains DC component, fundamental frequency component, double frequency component and triple frequency component. The current on the DC side will fluctuate. In this paper, a bridge arm impedance asymmetric circulation suppression strategy for MMC-HVDC system is proposed, which combines proportional integral control with finite control set model predictive control to calculate the integrated objective function in all switching states of the converter, and adjusts the switching state corresponding to the minimum value of the synthetic objective function according to the minimum value of the circulation suppression objective function and the circulation suppression compensation level. The control strategy can suppress the circulation AC component well, reduce the current fluctuation on the DC side, and make the symmetrical distribution of the sum fundamental frequency component, double frequency component and triple frequency component of the output voltage of the lower arm module on the phase where the impedance asymmetry of the bridge arm is located. The simulation results verify the feasibility and effectiveness of the proposed control strategy.
【作者单位】： 华北电力大学电气与电子工程学院;国网山东省电力公司济南供电公司;国网北京朝阳供电公司;国网沧州供电分公司;
【基金】：国家自然科学基金资助项目(51607069) 河北省自然科学基金资助项目(E2015502012) 中央高校基本科研业务费专项基金资助项目(2016MS88,2017MS091) 国家电网公司科技项目资助(SGHECZ00FCJS1700493)~~
【分类号】：TM721.1
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