Abstract
Because VSC-HVDC is a kind of strong nonlinear, coupling, and multi-input multioutput (MIMO) system, its control problem is always attracting much attention from scholars. And a lot of papers have done research on its control strategy in the continuous-time domain. But the control system is implemented through the computer discrete sampling in practical engineering. It is necessary to study the mathematical model and control algorithm in the discrete-time domain. The discrete mathematical model based on output feedback linearization and discrete sliding mode control algorithm is proposed in this paper. And to ensure the effectiveness of the control system in the quasi sliding mode state, the fast output sampling method is used in the output feedback. The results from simulation experiment in MATLAB/SIMULINK prove that the proposed discrete control algorithm can make the VSC-HVDC system have good static, dynamic, and robust characteristics in discrete-time domain.
Highlights
Voltage source converter based high voltage direct current (VSC-HVDC) technology which uses advanced IGBT device and pulse width modulation (PWM) method overcomes the disadvantage of traditional HVDC
The discrete mathematical model of the VSCHVDC system based on nonlinear feedback linearization and discrete sliding mode control algorithm are proposed in this paper
The simulation results performed in MATLAB/SIMULINK show that the proposed discrete control strategy can make the VSC-HVDC system have good operation performance
Summary
Voltage source converter based high voltage direct current (VSC-HVDC) technology which uses advanced (insulated gate bipolar transistor) IGBT device and pulse width modulation (PWM) method overcomes the disadvantage of traditional HVDC. Reference [8] presented the elements of VSC-HVDC and proposed a feed-forward decoupled current control strategy In this phase, the study is mainly based on the traditional PI controllers under the linear decoupling control strategy. (2) Optimizing and nonlinear control strategy of the VSC-HVDC system: [9] proposed an adaptive control design to improve dynamic performances of VSCHVDC systems. Reference [12] addressed two different robust nonlinear control methodologies based on sliding mode control for the VSC-HVDC transmission system’s performance enhancement and stability improvement. The discrete-time mathematic model and control strategy based on nonlinear control methods are seldom studied by scholars. The discrete mathematical model of the VSCHVDC system based on nonlinear feedback linearization and discrete sliding mode control algorithm are proposed in this paper. The simulation results performed in MATLAB/SIMULINK show that the proposed discrete control strategy can make the VSC-HVDC system have good operation performance
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