Inherent Interaction Analysis for Harmonic Oscillations in the Multi-Paralleled Grid-Connected Inverter System Using a Sum Type Criterion: Global Admittance (GA)
Inherent Interaction Analysis for Harmonic Oscillations in the Multi-Paralleled Grid-Connected Inverter System Using a Sum Type Criterion: Global Admittance (GA)
复制标题
使用求和型准则：全局导纳 (GA) 对多并网逆变器系统中的谐波振荡进行固有相互作用分析
DOI：
10.1109/access.2020.2964330
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发表时间：
2020-01
期刊：
影响因子：
3.9
通讯作者：
赵剑锋
中科院分区：
文献类型：
--
作者：
曹武;汪舜羽;康昊天;刘康礼;王青松;赵剑锋
随着电力电子变换器的广泛应用，多逆变器并网系统中的谐波振荡问题引起了人们的广泛关注。除了基于阻抗的稳定性分析方法进行稳定性分析外，交互作用分析的目的是揭示系统状态在电网阻抗、并网逆变器个数、逆变器电流控制参数等参数变化时的变化过程。本文在比较了比值型稳定性判据和型稳定性判据后，在两个频域维度中呈现使用全局导纳的交互分析。结果表明，谐振不稳定性既取决于决定谐振点出现的全局导纳虚部，又取决于反映谐振点性质的全局导纳真实的部。这种方法的实质是揭示谐振点的出现及其对系统稳定性的影响。在不同的电网阻抗、不同的并网逆变器数量和不同的电流控制环控制参数等典型情况下，阐述了谐振点的内在变化规律。仿真和实验结果验证了该方法的有效性。
With the extensive use of power electronics converters, harmonic oscillation issues in the multi-paralleled grid-connected inverter system have drawn much attention. Apart from the stability analysis using the impedance-based stability analysis method, the interaction analysis is aimed at revealing the changing process of the system state under the variation of some parameters such as the grid impendence, the number of grid-connected inverters and the control parameter of the inverter current control, etc. In this paper, after comparing the ratio type stability criterion and the sum type stability criterion, the interaction analysis using global admittance is presented in two frequency-domain dimensions. It shows that the harmonic instability depends on both the imaginary part of global admittance which determines the appearance of the resonance point and the real part of global admittance which reflects the property of such resonance point. The essence of this approach is to reveal the appearance of the resonance point and its influence on the system stability. The inherent changing rules of the resonance point are illustrated in the following typical occasions: different grid impendence, different number of grid-connected inverters and different control parameters of the current control loop. Finally, detailed simulations and experimental results validate the effectiveness of the proposed approach.
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