引用本文: | 吴振军,谢 欢,代东任,等.T型三电平并网变换器电流重构模型预测控制策略[J].电力系统保护与控制,2022,50(17):117-124.[点击复制] |
WU Zhenjun,XIE Huan,DAI Dongren,et al.Model predictive control strategy for current reconstruction of a T-type three-level grid-tied converter[J].Power System Protection and Control,2022,50(17):117-124[点击复制] |
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摘要: |
T型三电平变换器是连接新能源和电网的关键设备,其电流传感器故障会导致控制策略失效,影响并网系统安全稳定运行。为提高T型三电平并网变换器可靠性,提出一种基于电流重构的模型预测控制策略。该策略分析相电流和电压矢量之间的关系,分别用直流电流、正常相电流和预测电流重构故障电流。重构故障电流所需的电压矢量按照重构方法分成两个电压矢量集合。连续使用预测电流重构故障相电流会导致重构电流积累误差。因此需要检测当前时刻电压矢量集合,确保下一时刻选择不同的电压矢量集合,避免重构电流积累误差。实验结果表明,在电流传感器故障后,所提策略可使T型变换器容错运行且并网电流拥有较低的电流总谐波失真率,提高了并网系统可靠性。 |
关键词: T型三电平变换器 传感器故障 电流重构 模型预测 矢量集合 |
DOI:DOI: 10.19783/j.cnki.pspc.211588 |
投稿时间:2021-11-24修订日期:2022-01-16 |
基金项目:国家自然科学基金项目资助(U2004166);河南省重点研究开发推广专项(科技攻关)项目资助(212102210021);河南省高等学校科技创新团队基金项目资助(22IRTSTHN017) |
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Model predictive control strategy for current reconstruction of a T-type three-level grid-tied converter |
WU Zhenjun,XIE Huan,DAI Dongren,GUO Leilei,XIAO Han,LI Chengshuai |
(1. School of Electrical Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China;
2. Henan Jiuyu EPRI Electric Power Technology Co., Ltd., Zhengzhou 450052, China) |
Abstract: |
The T-type 3-level converter is key piece of equipment connecting new energy to the grid. If it experiences a current sensor fault, this will lead to the failure of control strategy and affect the safe and stable operation of the grid-tied system. A model predictive control strategy based on current reconstruction is proposed to improve the reliability of the T-type 3-level grid-tied converter. The relationship between phase current and voltage vector is analyzed. Fault current is reconstructed by DC current, normal phase current, and predicted current, respectively. The voltage vectors required for fault current reconstruction are divided into two voltage vector sets according to reconstruction methods. The continuous use of the prediction current to reconstruct the fault phase current will lead to an accumulation error in the reconstruction current. Therefore, it is necessary to detect the voltage vector set at the current moment to ensure that different voltage vector sets are selected at the next moment to avoid current accumulation errors in reconstruction. Experimental results show that the proposed strategy can realize fault-tolerant operation after a current sensor failure of a T-type converter, offers a lower current total harmonic distortion rate, and improves the reliability of the grid-tied system.
This work is supported by the National Natural Science Foundation of China (No. U2004166). |
Key words: T-type three-level converter sensor fault current reconstruction model predictive vector sets |