非对称电网状态下MMC-HVDC改进滑模直接功率控制策略

关天一; 王怡博; 王睿; 赵海乔; 郑文婧; 孙秋野

doi:10.13700/j.bh.1001-5965.2023.0277

非对称电网状态下MMC-HVDC改进滑模直接功率控制策略

doi: 10.13700/j.bh.1001-5965.2023.0277

关天一^{1, 2},
王怡博¹,
王睿^1, ,,
赵海乔¹,
郑文婧³,
孙秋野¹

1.
东北大学信息科学与工程学院，沈阳 110819
2.
国网辽宁省电力有限公司沈阳供电公司，沈阳 110811
3.
国网辽宁省电力有限公司营销服务中心，沈阳 110168

基金项目:

国家自然科学基金(U20A20190,62073065)

详细信息

通讯作者:
E-mail：wangrui@ise.neu.edu.cn

中图分类号: TM46
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- 被引次数: 0
出版历程
- 收稿日期: 2023-05-25
- 录用日期: 2023-11-15
- 网络出版日期: 2023-12-06
- 整期出版日期: 2025-05-31

Improved sliding-mode direct power control strategy for MMC-HVDC under asymmetrical grid state

1.
College of Information Science and Engineering，Northeastern University，Shenyang 110819，China
2.
State Grid Liaoning Electric Power Co.，Ltd.，Shenyang Power Supply Company，Shenyang 110811，China
3.
State Grid Liaoning Electric Power Co.，Ltd.，Marketing Service Center，Shenyang 110168，China

Funds:

National Natural Science Foundation of China (U20A20190,62073065)

More Information

Corresponding author: E-mail：wangrui@ise.neu.edu.cn

摘要

摘要:
基于模块化多电平换流器的高压直流(MMC-HVDC) 输电系统是动态功率平衡系统，在非对称电网状态下，MMC的功率控制一般采用基于传统瞬时功率模型的双闭环矢量控制策略，存在控制结构复杂、控制精度低等问题。为此，引入柔性瞬时功率模型，以有功功率和柔性无功功率为控制对象建立通用功率方程，提出一种基于柔性瞬时功率模型的MMC-HVDC改进滑模直接功率控制策略。该策略结合柔性瞬时功率模型和改进滑模控制方法，消除非对称电网状态下MMC输出功率的波动分量，省略了电流内环与功率补偿项，优化了控制结构。仿真和实验结果表明：所提控制策略在非对称电网、参数摄动等运行工况下的动态响应能力、控制精度和鲁棒性更强，更能发挥出柔性瞬时功率模型的优势。
- 基于模块化多电平换流器的高压直流 /
- 非对称电网 /
- 滑模控制 /
- 柔性瞬时功率模型 /
- 鲁棒控制
Abstract:
The modular multilevel converter based high voltage direct current (MMC-HVDC) is a dynamic power balancing system. The control system of MMC generally adopts a dual closed-loop vector control strategy based on the traditional instantaneous power model under an asymmetric grid state, which has a complex control structure and low control accuracy. This paper introduces a flexible instantaneous power model and establishes a general power equation with active power and new reactive power as control objects. In order to eliminate the twice grid-frequency ripples in both active and reactive power under asymmetric grid states, an enhanced sliding-mode MMC-HVDC direct power control strategy based on the new instantaneous power model is proposed. This approach combines the improved sliding-mode control method with the flexible instantaneous power model. Furthermore, it omits the inner-loop controller and power compensation terms while optimizing the control structure. According to simulation results, the suggested approach can more effectively take advantage of the benefits of the flexible instantaneous power model because it has superior dynamic responsiveness, control precision, and robustness under operating conditions including asymmetric grid state and parameter perturbation.
- modular multilevel converter based high voltage direct current /
- asymmetrical grid /
- sliding mode control /
- flexible instantaneous power model /
- robust control

HTML全文

图 1 MMC等效电路

Figure 1. MMC equivalent circuit

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图 2 SMC的响应过程

Figure 2. Response process of SMC

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图 3 本文控制系统结构框图

Figure 3. Block diagram of the proposed control strategy

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图 4 四端MMC-HVDC系统

Figure 4. Four-terminal MMC-HVDC system

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图 5 对称电网条件下MMC2的稳态仿真情况

Figure 5. Steady-state simulation results of MMC2 under balanced grid condition

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图 6 非对称电网条件下MMC2的暂态运行情况

Figure 6. Transient operation results of MMC2 under asymmetric grid condition

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图 7 PI控制器、传统滑模控制器与改进滑模控制器的动态和鲁棒性控制效果对比

Figure 7. Comparison of control results of dynamic power responses and robustness using PI controller, conventional SMC and improved SMC

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图 8 MMC硬件在环实验平台

Figure 8. Hardware-in-the-loop experiment topology of MMC

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图 9 对称电网条件下MMC2的稳态实验结果

Figure 9. Steady-state experimental results of MMC2 under balanced grid condition

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图 10 非对称电网条件下MMC2的暂态实验结果

Figure 10. Transient operation experimental results of MMC2 under asymmetric grid condition

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表 1 MMC2换流站参数

Table 1. Parameters of MMC2 converter station

参数数值

系统直流电压/kV ±200

交流线电压/kV 220

子模块电容/μF 8950

桥臂电感/mH 41.5

子模块数量/个 120

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