为研究多源多负荷参数间的耦合交互对系统稳定运行的影响,该文建立多源多负荷直流微电网的小信号模型,基于系统振荡模态以及参与因子进行电压稳定性分析。在考虑同类参数耦合的系统稳定裕度分析中,发现全新规律为三台电源供电时,源侧线路长度采用“两长一短”比“两短一长”时系统稳定裕度更大。在考虑异类参数交互的系统稳定裕度分析中,详细解释了多源中下垂系数和虚拟惯性系数的交互作用。基于多控制参数的耦合交互影响,提出控制参数优化设计方法,实现系统稳定裕度最大,并使多源具有提供较大惯性的能力。最后,实验结果验证了上述分析的正确性。
Abstract
In order to study the influence of multi-source and multi-load parameters on the stable operation of the system, a small-signal model of multi-source and multi-load DC microgrid is established in this paper. The voltage stability analysis is carried out based on the oscillation modes and participation factors of the system. The stability margin analysis of the system with the same kind of parameter coupling is carried out. When three power supply, a new pattern is discovered that the system stability margin is larger when the source-line length is “two long and one short” than when the source-line length is “two short and one long”. The interaction between the droop coefficient and the virtual inertia coefficient is explained in detail in the stability margin analysis under heterogeneous parameter. Based on the coupling interaction of multiple control parameters, the optimal design method of control parameters is proposed to achieve the maximum stability margin of the system and have the ability to provide greater inertia. Finally, the experimental results verify the correctness of the above analysis.
关键词
微电网 /
DC-DC变换器 /
稳定性 /
小信号模型 /
参数优化设计
Key words
microgrids /
DC-DC converters /
stability /
small-signal model /
parameter optimization design
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基金
国家自然科学基金（52107185）; 广东省自然科学基金（2023A1515010061）
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