Kalman filtering control method for electrolytic aluminum load participating in power system frequency modulation

Abstract

A Kalman filtering control method for an electrolytic aluminum load to participate in frequency modulation of a power system comprises the following steps: step 1, establishing a transfer function between an electrolytic aluminum load reference control signal and actual output power based on working characteristics of the electrolytic aluminum load; 2, on the basis of the electrolytic aluminum load transfer function established in the step 1, establishing a frequency response model considering the electrolytic aluminum load, and obtaining a differential form expression of a kinetic equation of a system; 3, on the basis of the differential form expression of the kinetic equation of the system obtained in the step 2, Kalman filtering is used for processing measurement signal errors; 4, on the basis of the frequency deviation obtained through Kalman filtering, a fuzzy controller is adopted to control the power consumption of the electrolytic aluminum load. The invention designs a frequency estimation method based on Kalman filtering aiming at the problem of frequency measurement error of load side frequency measurement, and aims to improve the performance of electrolytic aluminum load participating in frequency control of a power system.

Description

technical field [0001] The patent of the present invention belongs to the field of power system automation, and more specifically relates to a Kalman filter control method in which electrolytic aluminum loads participate in power system frequency modulation. Background technique [0002] With the massive access of renewable energy such as wind power and photovoltaics, the active power balance of the power system is facing great challenges. The active power balance problem caused by the access of renewable energy is reflected in the anti-peaking characteristics of power in the long time scale, and it is reflected in the frequency stability problem in the short time scale. Since the frequency reflects the balance of active power, when the power balance is disrupted, the frequency will increase or decrease. [0003] As a method to stabilize the power fluctuation of renewable energy, electricity demand response has been paid more and more attention. Demand response achieves th...

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Problems solved by technology

[0005] In the process of electrolytic aluminum load participating in frequency regulation, the frequency of the power system is difficult to obtain by measuring the rotational speed of the generator rotor like the power generation side, and the frequency measurement through the load side faces the measurement noise problem caused by the electromagnetic transient process

Due to the nonlinear characteristics of electrolytic aluminum load, it is difficult to obtain ideal results in some cases such as PID control strategy

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