Control and stability analysis of DC microgrid system including wind and solar generation sources and grid‐connected voltage source converter,International Journal of Circuit Theory and Applications

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Control and stability analysis of DC microgrid system including wind and solar generation sources and grid‐connected voltage source converter
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2021-01-19 , DOI: 10.1002/cta.2948
Hassan Hassantaghi ₁ , Mohsen Rahimi ₁

Affiliation

The study system in this paper is a grid‐connected DC microgrid system comprising PV and wind generation sources, resistive and constant power loads (CPLs), and grid‐connected VSC. The VSC keeps the DC link voltage constant, and the wind and PV sources operate in maximum power point tracking (MPPT) mode, and thus, the DC–DC converters related to these sources act such as controlled current sources behaving similar to negative CPLs. The study system suffers from the stability under high CPL penetration and weak AC grid conditions. Hence, this paper investigates and enhances the system stability under both high CPL penetration and weak AC grid conditions. To do this, modal and small‐signal stability analysis of the system is carried out, and then, as the main findings, impacts of the wind and PV sources output powers, CPL power, and AC grid short‐circuit power on the system stability are studied. Next, as the main contribution, VSC control structure is modified by adding stabilizing signals to enhance the system stability under high CPL penetration, reduced output powers of the wind and PV sources, and weak AC grid conditions. At the end, several simulation results verify the theoretical results at different conditions.

中文翻译：

直流微电网系统的控制和稳定性分析，包括风力和太阳能发电源以及并网电压源转换器

本文的研究系统是一个并网直流微电网系统，包括光伏和风力发电源，电阻和恒定功率负载（CPL）以及并网VSC。VSC保持DC链路电压恒定，风能和PV源在最大功率点跟踪（MPPT）模式下运行，因此，与这些源相关的DC-DC转换器的行为例如具有类似于负CPL的受控电流源。该研究系统在高CPL穿透力和弱AC电网条件下具有稳定性。因此，本文研究并增强了在高CPL穿透和弱AC电网条件下的系统稳定性。为此，要对系统进行模态和小信号稳定性分析，然后作为主要发现，对风能和光伏源输出功率，CPL功率，研究了交流电网短路功率对系统稳定性的影响。接下来，作为主要贡献，通过添加稳定信号来修改VSC控制结构，以增强在高CPL穿透，降低风能和PV源的输出功率以及弱AC电网条件下的系统稳定性。最后，几个仿真结果验证了不同条件下的理论结果。

更新日期：2021-03-17

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