基于电网电流前馈补偿的无电解电容驱动系统网侧高功率因数控制策略

doi:10.19595/j.cnki.1000-6753.tces.251638

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Abstract The capacitor-less compressor drive system employs small-capacity film capacitors while eliminating the power factor correction circuit, significantly enhancing system integration, operational reliability, and lifecycle. While replacing large electrolytic capacitors with small-value DC-bus film capacitors reduces costs and minimizes the physical footprint, the reduced DC-side capacitance increases coupling between the grid-side and motor-side energy, leading to increased grid-side current harmonics and a diminished system power factor. Traditional control strategies typically employ grid-side current differentiation and observer methods. However, current differentiation amplifies signal noise, potentially compromising system stability. Concurrently, the observer approach necessitates parameter design, increasing the complexity of system algorithms.
This paper proposes a strategy based on current feedforward compensation. First, the power coupling between the DC bus front-end and back-end stages and the grid current harmonic power is modeled. Subsequently, an indirect differential model of the grid current is established to extract and compensate for grid current harmonics. The proposed method can obtain the rate of change of the grid current without directly measuring it, thereby avoiding error amplification that would result from directly differentiating the grid current. Additionally, a method for selecting compensation coefficients is provided to meet system stability and steady-state performance requirements.
The experiment is conducted using a 750 W air-conditioner compressor. Compared with inverter-based power control and PR control, the proposed method achieves the highest sinusoidal waveform quality for the grid-side current, the lowest harmonic content, and the highest power factor of 0.99, meeting IEC 61000-3-2 standards. Tests at 1 000 W confirm that the proposed algorithm maintains excellent performance, with the power factor sustained at 0.99.
The following conclusions can be drawn. (1) By utilizing grid voltage and bus voltage information to calculate the grid current rate of change, the error amplification issue caused by directly differentiating the grid current is avoided. (2) By extracting grid-side harmonic currents and implementing feedforward compensation on the q-axis currents, precise control over inverter power output is achieved. (3) By considering both the system’s stability requirements and its steady-state performance, this paper establishes a feasible range for the compensation coefficient m. It ensures that the selected value simultaneously satisfies stability constraints, enhances resonance suppression, and meets overall steady-state performance requirements.

Key words： Permanent magnet compressor film capacitor grid current feedforward compensation harmonic current

Received: 21 September 2025

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TM351

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	Zhang Xiaojun
	Huang Wanben
	Situ Anqi
	Kang Min
	Yang Jiaqiang

Cite this article:

Zhang Xiaojun,Huang Wanben,Situ Anqi等. High Power Factor Control Strategy for Electrolytic Capacitor-Free Drive System Based on Grid Current Feedforward Compensation[J]. Transactions of China Electrotechnical Society, 2026, 41(18): 6256-6267.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.251638 OR https://dgjsxb.ces-transaction.com/EN/Y2026/V41/I18/6256

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