| 引用本文: | 马文忠,王晓康,赵 雨,等.适用于多端口模块化多电平交直流变换器的分段变步长模型预测控制策略[J].电力系统保护与控制,2023,51(8):13-25.[点击复制] |
| MA Wenzhong,WANG Xiaokang,ZHAO Yu,et al.Piecewise variable step-size model predictive control strategy for multi-port modularmultilevel AC/DC converter[J].Power System Protection and Control,2023,51(8):13-25[点击复制] |
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| 摘要: |
| 传统模型预测控制存在计算量大及权重因子整定困难等问题，并且对于多端口模块化多电平交直流混合变换器(multi-port modular multilevel AC/DC hybrid converter, MP-M2ADHC)适用性不足。首先利用桥臂内电势等效原理分析了MP-M2ADHC的交直流耦合特性及内部功率平衡约束，并提出了分段变步长模型预测控制(piecewise variable step-size model predictive control, PVS-MPC)策略。通过多个寻优环节，在不同时间尺度下寻求最佳开关状态使得系统预测值与期望值的误差最小，实现了对多个控制目标单独控制。为满足预测模型精确离散化需求，进一步提出采用改进欧拉法对系统反馈值进行优化与校正，从而显著提高预测精度。最后，通过对变换器不同模式下功率双向传输的时域仿真，从输出电流跟踪、环流抑制及谐波含量等方面与传统模型预测控制进行对比，验证了所提控制策略与优化校正策略的可行性和有效性。 |
| 关键词: 多端口模块化多电平变换器 桥臂内电势模型 模型预测控制 精确离散化 交直流功率双向传输 |
| DOI：10.19783/j.cnki.pspc.221143 |
| 投稿时间：2022-07-19修订日期：2022-11-13 |
| 基金项目:国家自然科学基金项目资助(51877215)；山东省自然科学基金项目资助(ZR2019MEE094) |
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| Piecewise variable step-size model predictive control strategy for multi-port modularmultilevel AC/DC converter |
| MA Wenzhong1,WANG Xiaokang1,ZHAO Yu1,LI Weiguo2,LIU Xingyu1,HUANG Jianwei1 |
| (1. College of New Energy, China University of Petroleum (East China), Qingdao 266580, China;
2. Shandong Energy Group, Jinan 250014, China) |
| Abstract: |
| Traditional model predictive control involves a large amount of calculation and it is difficult to set the weight factor. Also, it is not suitable for a multi-port modular multilevel AC/DC hybrid converter (MP-M2ADHC). In this paper, the AC/DC coupling characteristics and internal power balance constraints of an MP-M2ADHC are analyzed using the equivalent principle of arm internal potential, and a piecewise variable step-size model predictive control (PVS-MPC) strategy is proposed. Through multiple optimization links, the optimal switching state is sought over different time scales to minimize the error between the predicted and the expected value of the system, and realize the independent control of multiple control targets. To satisfy the demand for accurate discretization of the prediction model, an improved Euler method is proposed to optimize and correct the feedback value of the system, so as to significantly improve the prediction accuracy. Finally, through the time-domain simulation of power bidirectional transmission of converters in different modes, the feasibility and effectiveness of the proposed control strategy and optimization correction strategy are verified by comparing with the traditional model predictive control in terms of output current tracking, circulation suppression and harmonic content. |
| Key words: multi-port modular multilevel converter equivalent model based on the internal potential of arm voltage model predictive control precise discretization AC/DC power bidirectional transmission |
