Superconducting magnetic energy storage voltage control method based on internal model robust control

Abstract

Disclosed is a superconducting magnetic energy storage voltage control method based on internal model robust control, wherein in the voltage control method, a difference value obtained by comparing areference voltage signal in an alpha beta coordinate system and an actual voltage signal is used as an input signal of an internal model robust controller, and the reference voltage signal in the alpha beta coordinate system is used as an input signal of a feed forward compensator; then output signals are added through the internal model robust controller and the feed forward compensator, alpha beta-ABC inverse coordinate transformation is performed, and a superconducting magnetic energy storage inverter control input command is obtained through PWM. In the control method, the internal model control can improve the harmonic suppression capability of a superconducting magnetic energy storage output voltage and the robust control can improve the interference resistance of the superconductingmagnetic energy storage output voltage so that a system using the voltage control method has higher robust stability and better dynamic tracking property when coping with sudden load increase.

Description

technical field [0001] The invention belongs to the field of superconducting magnetic energy storage systems, in particular to a superconducting magnetic energy storage voltage control method based on internal model robust control. Background technique [0002] Distributed power generation composed of renewable energy has the characteristics of high energy utilization rate, less environmental pollution and flexible power generation methods. It has gradually become an effective supplement to traditional centralized power generation and has been vigorously promoted. Distributed power generation mostly appears in the form of a microgrid structure. In order to coordinate the output of distributed power sources and weaken the adverse effects of randomness, volatility and intermittency of distributed power sources on the stability of the grid, microgrids are usually equipped with power storage devices of a certain capacity. Superconducting Magnetic Energy Storage (SMES) is a fast...

AI Technical Summary

Problems solved by technology

However, the voltage loop of this method still adopts PI (double-loop voltage) control (that is, the double-loop control strategy of the voltage outer loop and the current inner loop, the voltage outer loop is controlled by PI to obtain the current reference value of the inner loop, and the current inner loop is controlled by PI to obtain the system voltage. reference value), the conventional PI controller cannot track the specified sub-harmonic without static error, and its robustness is poor when dealing with disturbances such as micro power output power fluctuations and load mutations.

Images