Adaptive wide-area damping controller and control method thereof

Abstract

The invention discloses an adaptive wide-area damping controller and a control method thereof. The controller comprises an adaptive time-lag compensator, a phase shifting unit and a GrHDP unit; the adaptive time-lag compensator is used for performing adaptive time-lag compensation on a wide-area measurement signal to obtain a signal x(t); the phase shifting unit is used for performing amplifying and phase shifting on the signal x(t) to obtain a parallel phase shifting signal X(t); the GrHDP unit obtains a control signal u(t) matched with the current operating condition of an electric power system based on an adaptive dynamic planning according to the parallel phase shifting signal X(t); the control method comprises the steps of (1) performing adaptive time-lag compensation on the wide-areameasurement signal; (2) performing amplifying and phase shifting to obtain the parallel phase shifting signal; and (3) obtaining the control signal u(t) matched with the current operating condition of the electric power system through a GrHDP neural network. System low-frequency oscillation can be suppressed effectively in different operating conditions and different communication time lags, so that system transient stability is improved.

Description

technical field [0001] The invention belongs to the field of flexible DC power systems, and more specifically relates to an adaptive wide-area damping controller and a control method. Background technique [0002] Flexible DC transmission technology (voltage source converter based high voltage direct current, VSC-HVDC) has the advantages of flexible control, no risk of commutation failure, and independent control of reactive power. It is one of the key technologies for new energy grid connection and power supply to passive systems. one. The back-to-back flexible DC transmission technology (BTB-VSC-HVDC) can also realize the interconnection of two asynchronous AC power grids, thereby improving the controllability of power grid operation and reducing the risk of safe and stable operation of the power grid. Combined with the wide-area measure system (WAMS) technology, a wide area damping controller (WADC) can be designed reasonably for the back-to-back flexible DC power system...

AI Technical Summary

Problems solved by technology

[0003] At present, the conventional wide-area damping controller (C-WADC) based on VSC-HVDC is designed by using the linearized mathematical model of the system under a typical operating condition. The adaptability of the operating conditions is poor, and the accurate mathematical model of the actual power system is difficult to obtain

[0004] In addition, there must be a communication time-lag during the transmission of wide-area measurement signals. In the past, the time-lag effect was not considered when designing WADC, or the time-delay was considered to be fixed. However, when the system is subjected to different disturbances, the time-delay will change; time-varying Time lag will cause WADC control performance degradation, and even threaten the transient stability of the system

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