三电平中点钳位型变换器线性自抗扰离散建模与稳定控制

doi:10.19595/j.cnki.1000-6753.tces.L80322

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Abstract In discrete domain, the mathematical model of three-level NPC grid-connected converter was established in this paper, and its stable domain was designed, in which linear active disturbance rejection control was adopted. The stable domain designed by this method was closely related to the control period, and it was much smaller than the previously unbounded one, that was more significant to guide to project practical digitalized controller. Combining with simulating analyses of three level grid-connected converter, the influences of controller parameters on the observer accuracy and control performance were analyzed, and the optimum parameters range of linear active disturbance rejection controller was determined. According to the designed discrete controller parameters, the linear active disturbance rejection control system of three level grid connected converter was simulated, while these disturbances about grid voltage, grid connected reactance and the neutral point voltage in DC side happened. The simulating results show that the discrete control model was correct in this paper, the designed method was feasible, and the controller parameters were more convenient and accurate to be determined. The linear active disturbance rejection control system of three level grid-connected converter has owned fast response, high control accuracy and good active disturbance rejection disturbance too.

Key words： Three level grid-connected converter linear active disturbance rejection control (LADRC) discrete model stable domain

Received: 01 July 2018 Published: 05 March 2020

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TM464

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	Wu Wenjun
	Cai Yuxi
	Lan Xuemei

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Wu Wenjun,Cai Yuxi,Lan Xuemei. Discrete Modeling and Stability Control of Linear Active Disturbance Rejection Control for Three-Level Neutral Point Clamped Converter[J]. Transactions of China Electrotechnical Society, 2020, 35(zk1): 37-48.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L80322 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/Izk1/37

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