模块化解耦电路的协同控制策略

doi:10.19595/j.cnki.1000-6753.tces.230363

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Abstract As an important development direction of active power decoupling (APD) technology, the modularization of active decoupling circuits has the advantages of standardization, independence, and versatility. However, the existing control strategies can only be applied to individual decoupling modules without considering the power distribution problem among multiple decoupling modules. Hence, a virtual impedance- based cooperative control strategy for multiple decoupling modules is proposed.
Firstly, the impedance characteristic of a passive LC resonance circuit is analyzed: for the DC component, the resonance circuit is equivalent to an open circuit; for the double-line frequency component, it is equivalent to a short circuit, and the resonance circuit bypasses the ripple current. When the external characteristic of individual decoupling modules is controlled to be consistent with the passive LC resonance circuit, the ripple power is well buffered by decoupling modules. Meanwhile, the control of decoupling modules is independent because only one external information is needed. No unified central controller is needed, and the plug-and-play function is realized.
Secondly, when considering the power distribution problem between multiple decoupling modules, the impedance characteristic of multiple passive RLC resonance circuits can be utilized. For the DC component, the RLC resonance circuit is still equivalent to an open circuit; the double-line frequency component is equivalent to a purely resistive circuit, and the ripple current flowing through each RLC resonance circuit is inversely proportional to its branch resistor. Thus, adding virtual power distribution resistors can realize the cooperative control of multiple decoupling modules without real-time communication between decoupling modules.
Then, this paper introduces the concrete implementation of the proposed cooperative control strategy with typical Buck-type decoupling modules. The controller design is discussed, including the virtual power distribution resistor selection and the parameters of the decoupling voltage\current controller.
Finally, a series of experiments are conducted. When two same decoupling modules work, the buffer power of each module is distributed according to the decoupling capacitance (satisfying the 1:1 distribution relationship), and the bus voltage ripple is effectively suppressed (Δv_dc/V_dc<5%). When two different decoupling modules work, the buffer power of each module is distributed according to the decoupling capacitance (satisfying the 2:1 distribution relationship), and the bus voltage ripple is also suppressed. The dynamic power variation experiments show that the proposed method can achieve flexible insertion and removal of decoupling modules, which verifies the plug-and-play performance of decoupling modules without communication. Except for the transient regulation process, the rectifier input current meets the performance index (PF=0.99, THD=3.6%).
According to the theoretical and experimental results, the proposed virtual impedance-based control strategy for decoupling modules relies only on the ripple information of the DC bus voltage. The decoupling power of each module is distributed in proportion to its decoupling capacitance. The problem of cooperative control is solved. The proposed control does not require the decoupling modules to interact with the main circuit for grid information, nor does it require the decoupling modules to communicate with each other. Thus, using a centralized central controller and expensive real-time communication equipment is avoided.

Key words： Single-phase converter active power decoupling cooperative control modularization

Received: 27 March 2023 Published: 07 June 2024

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	Liu Yonglu
	Yuan Yinhao
	Wang Hui
	Su Mei
	Zhang Wanlu

Cite this article:

Liu Yonglu,Yuan Yinhao,Wang Hui等. Cooperative Control Strategy for Modular Decoupling Circuits[J]. Transactions of China Electrotechnical Society, 2024, 39(10): 3118-3128.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.230363 OR https://dgjsxb.ces-transaction.com/EN/Y2024/V39/I10/3118

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