Study on control strategy of large-scale renewable energy connect to LCC-HVDC system

Abstract

One of the important issues facing large-scale renewable energy development is to ensure the maximum consumption of large-scale renewable energy bases and the safe and stable operation of the power grid after connect. The research results show that when large-scale renewable energy generation is connected to the power grid, its volatility, randomness and intermittentness will have a certain impact on the system power balancing, reactive voltage and transient stability of the power grid. Renewable energy connect to LCC-HVDC is one of the commonly used long-distance large-scale power transmission methods. On the one hand, in order to ensure stable operation, the LCC-HVDC system needs to provide sufficient reactive power support for itself and the system. On the other hand, for large-scale renewable energy power stations, the collection lines are often long, and each renewable energy generator usually uses its own optimal operation as the control target, which causes reactive voltage control problems and harmonic amplification in the power station problem. Therefore, in order to coordinate the reactive power coordination and voltage regulation after the renewable energy is connected to the LCC-HVDC system, this paper studies the large-scale renewable energy power generation LCC-HVDC transmission connection and the supporting technology required for the development of renewable energy power generation. And the use of guidance is of great significance to help increase the accommodation space of large-scale renewable energy generation.