Operation stability analysis method for AC-DC power distribution and utilization system

Abstract

The invention provides an operation stability analysis method for an AC-DC power distribution and utilization system. The method comprises the steps of: 1, building a first transfer function between aDC bus voltage and the DC side voltage of an AC / DC interconnection converter station according to the equivalent circuit of an AC / DC power distribution system; 2, establishing a mathematical expression between the DC side voltage change and active power change of the AC / DC interconnected converter station according to the equivalent circuit of the AC / DC power distribution system, and establishinga second transfer function between the DC bus voltage and the active power on the basis of the first transfer function output in the step 1; 3, establishing a third transfer function between the active power and AC according to the structures of the power controller and current controller of the AC / DC interconnected converter station, and establishing a fourth transfer function between the DC busvoltage and the AC on the basis of the second transfer function output in the step 2; and 4, complex torque decomposition is performed on the fourth transfer function output in the step 3 to obtain the amplitude-frequency gains of a synchronous torque and a damping torque.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a method for analyzing the operation stability of an AC / DC power distribution system. Background technique [0002] The AC and DC power distribution system will become one of the important forms of the future power distribution network. figure 1 In the AC / DC power distribution system shown, AC system 1 and AC system 2 are interconnected through a DC network, and the AC sides of AC / DC interconnection converter station 1 and AC / DC interconnection converter station 2 are respectively connected to AC system 1 and AC In system 2, the DC sides of the two are connected to the DC bus through a certain line. The DC network can be integrated with renewable energy such as wind power and photovoltaics, energy storage systems and DC loads. When the voltage level of the equipment does not match the voltage level of the DC bus, a DC / DC converter can be added for conversion. Usually, a certain AC...

AI Technical Summary

Problems solved by technology

The modeling process of this method is relatively complicated, and as the order of the system increases, the model becomes more and more advanced, making it difficult to conduct a convenient analysis of stability

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