Method for optimizing control parameters of hybrid multi-end direct current transmission system

Abstract

The invention belongs to the field of optimization of control parameters of a direct current transmission system, and relates to a method for optimizing control parameters of a hybrid multi-end directcurrent transmission system. The method comprises the steps of: establishing a detailed nonlinear state space model of LCC and MMC converter stations for the hybrid multi-end direct current transmission system, and realizing the simultaneousness of the converter stations through a phi type equivalent direct current transmission line to figure out a steady state balance point state value; performing Taylor expansion on the constructed nonlinear state space model, ignoring high-order terms, and constructing a universal and detailed small-interference dynamic model of the hybrid multi-end directcurrent transmission system; constructing a penalty function associated with a feature value to serve as an objective function by using a feature value of a state matrix of the small-interference dynamic model as the basis for the small-interference stability analysis of the system; and performing optimization solution on the control parameters of controllers of the hybrid multi-end direct current transmission system by using a particle swarm optimization to obtain an optimal control parameter combination of the hybrid multi-end direct current transmission system. By adopting the method provided by the invention, the global optimization efficiency of the control parameters of the direct current transmission system is improved.

Description

technical field [0001] The invention belongs to the field of optimization of control parameters of a direct current transmission system, and relates to a control parameter optimization method of a hybrid multi-terminal direct current transmission system. Background technique [0002] LCC (Line Commutated Converter) high-voltage DC transmission technology has large transmission capacity and low cost, while MMC (Modular Multilevel Converter) DC transmission technology can independently control power without the risk of commutation failure. The hybrid multi-terminal DC transmission technology combines the advantages of both, and has been paid more and more attention by scholars at home and abroad in recent years. Southwest my country is rich in clean energy, while the eastern region is short of energy and loads are concentrated. Under the background of the "West-to-East Power Transmission" strategy, accelerating the construction of hybrid multi-DC power transmission projects f...

AI Technical Summary

Problems solved by technology

[0003]The existing control parameter optimization methods of traditional direct current transmission systems have low efficiency, lack of theoretical basis, incomplete consideration of control effect indicators, and the simplification of the MMC model reduces the accuracy , Multi-terminal control parameter coordination and optimization are difficult, and it does not have universality

Moreover, the structure of the hybrid multi-terminal direct current transmission system is more complex, the modeling difficulty is high, and the requirements for inter-station control system and control parameters are more stringent. greater impact, which cannot meet the needs of hybrid multi-terminal DC transmission system control parameter optimization

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