A Multi-Channel Robust Damping Control Method Based on Static h∞ Loop Shaping Method

Abstract

The invention discloses a multichannel robustness damping control method based on a static state H-infinite loop shaping method; the multichannel robustness damping control method comprises the following steps: adding a robustness damping controller to simultaneously control subsynchronous oscillations and low frequency oscillations; using a solve linearity matrix inequality to directly solve the controller; using the total least square rotation constant technology to identify a system oscillation modal and a reduced-order model; using a Butterworth band pass filter to decompose different oscillation modals into a plurality of channels; using the static state H-infinite loop shaping method to design different robustness damping controllers for different channels, thus reducing mutual influences between the controllers. Compared with a conventional proportion-integration-differential (PID) controller, the multichannel robustness damping control method has better control effect, can simultaneously control the subsynchronous oscillation and low frequency oscillation, and has better robustness; in addition, the controller is low in order, and output feedback is employed, so engineering practice is easy; the multichannel robustness damping control method is small in computational complexity and low in algorithm complexity.

Description

technical field [0001] The invention relates to the technical field of high voltage direct current transmission, specifically a static H ∞ A Multi-Channel Robust Damping Control Method for Loop Shaping. Background technique [0002] Under the development trend of smart interactive grid, the coexistence of AC and DC has become an inevitable trend of grid development. At present, the DC sending ends of Shangxiang, Jinsu, and West Zhejiang are all located in the Sichuan Power Grid, forming a situation where there are multiple DC destinations at the sending end of the power system, and it is very likely to form an island operation mode. Under the island operation mode, the risk of subsynchronous oscillation and low-frequency oscillation faced by Sichuan Power Grid increases. When the control is improper or two different types of oscillations interact, it may even cause the collapse of the island system (Hu Yunhua, Zhao Shuqiang, Ma Yanfeng, et al. Damping analysis of the unifi...

AI Technical Summary

Problems solved by technology

However, in the tuning of controller parameters, many literatures are mostly based on trial and error or empirical tuning, which has a certain degree of blindness, and is prone to problems such as inaccurate tuning and unsatisfactory control effects; and the controller link is composed of multiple modules. Each module affects each other, and there is a problem of increased control error

Among the design methods of many additional damping controllers, the robust control theory stands out due to its superior robustness and good control performance, and is favored by scholars (Li Baohong, Zhang Yingmin, Li Xingyuan, etc. Multi-channel HVDC Additional robust controller design [J]. Grid Technology, 2014, 38(4): 858-864.), but the current research on robust damping controllers generally has the problem of too high controller order, especially In the case of a large-scale system, even after using the reduced-order technology, there are still high orders, which brings certain difficulties to engineering practice, so it is of great significance to study the method of designing low-order robust damping controllers

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