科研之友
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摘要
Developing renewable energy is an important way to implement the green-oriented transition of energy and achieve the goals of carbon peaking and carbon neutrality. Under such circumstance, the power system configuration will undergo a fundamental transformation, from the traditional power system dominated by synchronous generators to a new one that is dominated by wind and solar sources. As the interface between the power grid and the renewable energy, power electronic converters have high flexibility and controllability. Designing control strategies to ensure the stable operation of grid-connected converters is one of the most important issues in the development of a power system with high penetration of renewable energy. For the grid-following converter(GFC), which synchronizes with the grid via the phase-locked loop, many control strategies have been proposed for ensuring its stable operation under complex grid conditions. For a specific scenario, a mathematical model of the GFC is established. By combining suitable stability analysis methods, the instability mechanism of GFC can be clarified. Then, the stable region of the GFC can be reshaped by improved control strategies. According to the models used in the stability analysis, the proposed strategies can be divided into two categories. One is to reshape the stable region of the GFC in the sense of small-signal disturbance, the other is for reshaping the stable region under transient scenarios. An overview works is presented. Moreover, to facilitate the development of the power system with high penetration of renewable energy, some future investigations towards the stable control of GFCs are discussed. ? 2023 JOURNAL OF ELECTRICAL ENGINEERING.
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