Battery energy storage device control method for low-frequency oscillation suppression of direct-current power distribution network

Abstract

The invention discloses a battery energy storage device control method for low-frequency oscillation suppression of a direct-current power distribution network. The method comprises the steps of obtaining a direct-current voltage value of a position where a battery energy storage device is connected to the direct-current power distribution network and an actual current value of the battery energy storage device; calculating to obtain a duty ratio compensation signal temporary value for suppressing low-frequency oscillation, and performing amplitude limiting to obtain a duty ratio compensation control signal final value for suppressing low-frequency oscillation; calculating a final value of a duty ratio control signal; a control driving signal is obtained; and the battery energy storage device is controlled, so that low-frequency oscillation suppression of the direct-current power distribution network is completed. Oscillation can be effectively suppressed after the low-frequency oscillation phenomenon of the direct-current power distribution network system occurs, and the method does not need support of a starting signal and an additional hardware circuit, and is high in reliability, good in oscillation suppression effect, convenient to implement and suitable for popularization and application. The direct-current power electronic device is also suitable for other occasions where direct-current power electronic devices with autonomous switching-on and switching-off capabilities provide low-frequency positive damping characteristics for a direct-current power distribution network, and the applicability is very good.

Description

Technical field [0001] The present invention belongs to the field of electrical automation, specifically relates to a battery energy storage device control method for low-frequency oscillation suppression of DC distribution network. Background [0002] With the development of economy and technology and the improvement of people's living standards, electric energy has been widely used in people's production and life, bringing endless convenience to people's production and life. Therefore, ensuring the stable and reliable supply of electrical energy has become one of the most important tasks of the power system. [0003] The DC distribution network is an important part of today's power systems. With the continuous improvement of the penetration rate of new energy and DC loads, in the operation and control of DC distribution networks, there are more and more problems that need to be solved, the first of which is the low-frequency oscillation of DC voltage. The problem of low-freque...

AI Technical Summary

Problems solved by technology

[0005] However, the current research on the low-frequency oscillation of the DC distribution network focuses on the control of the DC distribution network, and there is no relevant research on the suppression of the low-frequency oscillation of the DC distribution network by the battery energy storage device.

Images