VSC-HVDC互联系统的改进前馈控制策略

发布时间：2018-01-31 14:14

本文关键词： 响应速度跟随性解耦前馈控制策略鲁棒性抗扰性　出处：《电测与仪表》2017年22期 　论文类型：期刊论文

【摘要】：为了提高柔性直流(VSC-HVDC)输电系统中系统的动态响应速度及与目标值具有更好的跟随性能,在传统直接电流控制中采用双闭环解耦控制策略基础上,针对系统中定有功功率和定直流电压控制方式,分别提出了对应的改进前馈控制策略。整流侧的定有功控制中,在其电压外环基础上增加一个预测信号输入到电流内环,以加快系统的响应速度,补偿了反馈信号的滞后性;逆变侧的定直流电压控制中,为了增加直流电压对外界的抗干扰性,把系统电压和直流电流的信号引入到该前馈控制中。最后,在PSCAD/EMTDC中搭建了一个2端的柔性直流输电系统模型,对系统处于不同运行状态下进行了仿真分析,结果表明,改进的前馈控制策略和目标值有较好的契合度,鲁棒性好,对外界的干扰具有一定的刚性。
[Abstract]:In order to improve the dynamic response speed and follow performance of VSC-HVDC-based flexible DC transmission system. On the basis of double closed loop decoupling control strategy used in the traditional direct current control, the constant active power and constant DC voltage control methods in the system are discussed. The corresponding improved feedforward control strategy is proposed. In the constant active power control of rectifier side, a predictive signal is added to the current inner loop on the basis of the voltage outer loop to speed up the response speed of the system. The hysteresis of the feedback signal is compensated; In the constant DC voltage control of inverter side, in order to increase the anti-interference of DC voltage, the signals of system voltage and DC current are introduced into the feedforward control. Finally. A two-terminal flexible direct current transmission system model is built in PSCAD/EMTDC. The simulation results show that the system is in different operation state. The improved feedforward control strategy has good agreement with target value, good robustness and rigidity to external disturbance.
【作者单位】：四川大学电气信息学院;
【分类号】：TM721.1
【正文快照】： 0引言近年来,随着大容量全控性电力电子器件和智能控制技术的进步,柔性直流输电技术得到了迅速的发展。柔性直流输电技术以其不会出现换相失败、良好的动态无功支撑、可实现有功和无功的独立控制、潮流翻转时电压极性不变、可向弱交流电网供电以及无源网络供电[1-4]等优势,已

【相似文献】