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  

Centralized Active Damping Device Suitable for Machine-network Resonance Suppression and Its Control Strategy

作　　者：阮诗韵 邱彬[1] RUAN Shiyun;QIU Bin(School of Electrical and Control Engineering,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学电气与控制工程学院,阜新123000

出　　处：《电源学报》2024年第6期122-129,共8页Journal of Power Supply

基　　金：国网公司总部科技项目(524608180092)。

摘　　要：针对并网逆变器(机组)接入弱电网时电网阻抗的宽范围变化可能导致系统不稳定的问题,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。为此,提出1种基于有源阻尼装置的虚拟阻抗值自适应调节方法,既可保证系统稳定性,又使有源阻尼装置中流过的电流尽可能小;提出1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。在实验室搭建1台5kW并网逆变器和1台1kW有源阻尼装置,验证了所提控制方案的有效性。When a grid-connected inverter(unit)is connected to a weak grid,the wide range of grid impedance variation may lead to system instability.To solve this problem,a centralized active damping device is configured in parallel at the point of common coupling(PCC)to simulate the external characteristics of damping resistance,thus realizing the suppression of resonance between the grid-connected inverter and grid.In this paper,an adaptive adjustment method for virtual impedance value based on active damping device is proposed,which not only ensures the system stability,but also minimizes the current flowing in the active damping device.At the same time,a current harmonic reference compensation method is proposed,which can reduce the influence of current closed-loop on the virtual impedance characteristics and further improve the damping effect.A 5 kW grid-connected inverter and a 1 kW active damping device were built in a laboratory to verify the effectiveness of the proposed control scheme.

关 键 词：并网逆变器 弱电网 稳定性 有源阻尼装置 

分 类 号：TM614[电气工程—电力系统及自动化]