Star-shaped AC/DC power distribution and utilization system operation stability analysis method

Abstract

The invention provides a star-shaped AC / DC power distribution and utilization system operation stability analysis method. The method comprises the following steps: 1, building an equivalent impedance of a single slave station: building the equivalent impedance of the single slave station according to the equivalent circuit of an AC / DC power distribution system; 2, constructing the overall equivalent impedance of the slave stations: establishing the parallel overall equivalent impedance of N-1 slave stations according to the equivalent circuit of the AC / DC power distribution system; 3, constructing a main station transfer function: establishing a first transfer function of a direct-current voltage control loop of the main station according to the structures of a power controller and a current controller of a voltage source type converter station; 4, constructing an integral transfer function of the system: connecting the parallel equivalent impedance of the N-1 slave stations in the step 2 with a DC load equivalent impedance in parallel, connecting to a master station side DC line, connecting the obtained equivalent impedance with the first transfer function in the step 3 in series, and establishing an integral second transfer function of the system; and 5, performing frequency domain analysis on the second transfer function in the step 4, and researching a system operation mechanism.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a method for analyzing the operation stability of a star-shaped AC / DC power distribution system. Background technique [0002] With the progress of society and the development of economy, the proportion of distributed energy in the energy structure is rapidly increasing. Its direct current connection to the power grid can reduce the commutation link, improve the efficiency, and reduce the harmonic content, while the large increase in the direct current load It also makes the significance of the DC power grid more and more obvious. Since the current power grid system is still dominated by AC loads, the AC-DC hybrid power distribution system will be one of the important forms of the power grid in the future. Due to the flexibility and diversity of the multi-terminal AC / DC power distribution system structure, it is urgent to develop a new system structure to meet the requirements of h...

AI Technical Summary

Problems solved by technology

Among them, the commonly used eigenvalue analysis method and impedance analysis method face the defects of difficulty in model construction and huge amount of calculation, especially when the system structure changes, it cannot be adjusted in time and lacks flexibility.

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