Abstract
For the power system interconnected with the large-scale offshore wind power through VSC-HVDC, such as SZ power grid, it may be engaged with transient frequency stability and lack of related control due to the randomness, fluctuation and intermittence of the wind. This paper proposes a transient frequency control strategy for the power system interconnected with offshore wind power through VSC-HVDC based on sensitivity. Firstly, the structure of SZ power grid and the calculation method of transient frequency stability index are introduced, and the transient frequency problems existing in SZ power grid are explored. Secondly, the mathematical formulation for the transient frequency control is described, including the objective function and the constraints. Furthermore, a transient frequency emergency control strategy based on special sequence and the sensitivities is proposed, which includes thermal units regulation, wind power regulation, DC modulation and load shedding. Finally, the effectiveness of the proposed control strategy is verified by simulation in SZ power grid.
Highlights
With the pressure of fossil energy shortage, climate change and environment needs, the wind power, which is a popular green and low-carbon energy, develops rapidly in China
In virtue of recognizing the above problems and facing the transient frequency stability problem engaged with SZ power grid, which is a power system interconnected with the offshore wind power through VSC-HVDC, this paper proposes an emergency control strategy for transient frequency stability of the offshore wind power system integrated through VSC-HVDC and verifies it with the above system
The contributions of this work are briefly summarized as follows: (1) A mathematical model for the transient frequency stability control of the power system interconnected with the offshore wind power through VSC-HVDC is proposed
Summary
With the pressure of fossil energy shortage, climate change and environment needs, the wind power, which is a popular green and low-carbon energy, develops rapidly in China. [6] presents a coordinated control strategy for the DC grid and offshore wind farms to improve rotorangle stability of the onshore synchronous power system; ref. (1) A mathematical model for the transient frequency stability control of the power system interconnected with the offshore wind power through VSC-HVDC is proposed. In this model, the minimum of the transient frequency stability index [18] and the curtailment of the wind power is taken as the objective, which comprehensively considers the transient frequency stability and incentive policy for the renewable energy power generation.
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