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| 摘要: |
| 针对大扰动情形，提出了一种多馈入直流输电系统的协调恢复策略。该策略具有如下的特点：在原有的PI控制器中加入一个前馈回路以便在直流系统2个控制端的被控量间实现协调控制；在交流故障被切除后的某一短时间内，采取定交流电压控制；在不同的直流子系统间实施渐变的恢复策略，并利用最大梯度下降法对各直流子系统的重启动时间进行优化。以一个三馈入直流输电系统为对象，给出了该协调控制器的设计过程及仿真结果。仿真结果表明，与常规的PI控制策略相比，该协调恢复策略可使多馈入直流输电系统的恢复性能得到很好的改善。 |
| 关键词: 多馈入直流输电系统 协调恢复策略 电力系统 PI控制器 |
| DOI： |
| 分类号:TM721.1 |
| 基金项目: |
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| Coordinated recovery strategy for multi-infeed HVDC systems |
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YANG Wei-dong 1 XU Zheng 2 HAN Zhen-xiang 2
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| Abstract: |
| A coordinated recovery strategy for multi-infeed HVDC systems under large disturbance is proposed.It has following features.A feed-forward loop is added to original PI controller to realize the coordinated control between the two controlled variables at the two control ends.A constant AC voltage control is applied for a short period after the AC fault is removed.A staggered recovery strategy is adopted for different HVDC subsystems with different restart time intervals,which are optimized using the steepest descending gradient search method.The simulation results for a tri-infeed HVDC system are given,which show that the recovery performance,with the proposed coordinated recovery strategy,has been improved a lot compared with the conventional control strategy. |
| Key words: HVDC,coordinated recovery,multi-infeed,control, |
