适用于机-网谐振抑制的集中式有源阻尼装置及其控制策略
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辽宁工程技术大学

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国网公司总部科技项目


Centralized active damping device suitable for machine - network resonance suppression And its control strategy
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Liaoning Technical University

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    摘要:

    当并网逆变器(机组)接入弱电网时,电网阻抗的宽范围变化可能会导致系统不稳定。为此,通过在公共耦合点处并联集中式有源阻尼装置,使其模拟阻尼电阻的外特性,可实现对并网逆变器和电网之间的谐振的抑制。本文提出一种基于有源阻尼装置的虚拟电阻值自适应调节方法,既保证系统稳定性,又使有源阻尼装置中流过的电流尽可能小。同时,本文还提出一种对电流谐波基准的补偿方法,能够减小电流闭环对虚拟阻抗特性的影响,进一步改进阻尼效果。通过在实验室搭建一台5kW的并网逆变器和一个1kVA的有源阻尼装置,验证了所提控制方案的有效性。

    Abstract:

    When a grid-connected inverter is connected to a weak grid, the system may be instable. An active damper, which synthesizes a damping resistor at the harmonic frequencies, can be connected to the point of common coupling (PCC) to damp the resonance and thus stabilize the system. In this paper, an adaptive tuning method of the virtual resistor is proposed, which can ensure the system stability while minimizing the port current of the active damper. Besides, to avoid the influence of the current loop on the characteristic of the virtual resistor, a compensation method for the harmonic current reference is proposed. The prototypes of a 5-kW grid-connected inverter and a 1-kVA active damper are built and tested to verify the effectiveness of the proposed control scheme of the active damper.

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  • 收稿日期:2021-10-27
  • 最后修改日期:2022-03-07
  • 录用日期:2022-03-09
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