A Novel Nonlinear Robust Control System of Unified Power Flow Controller

Abstract

The present invention provides a novel non-linear robustness control system of a unified power flow controller. The system comprises a measurement module, a signal simulation transformation module, a comparison module, a state space conversion module, a central control module, a state space inverse transformation module, a voltage source converter gate trigger and control module and a UPFC module. The signal output end of the measurement module is connected with the signal input end of the UPFC module through the signal simulation transformation module, the comparison module, the state space conversion module, the central control module, the state space inverse transformation module and the voltage source converter gate trigger and control module in order, and the signal output end of the UPFC module is connected with a power transmission system. The non-linear robustness control method provided by the invention is a continuous control method with no need for boundary functions, and is able to fully maintain and utilize the non-linear physical structure characteristics of a controlled object UPFC and realize the real-time control of the UPFC.

Description

Technical field [0001] The invention relates to a new non-linear robust control system of a unified power flow controller, in particular to the technical field of flexible AC power transmission. Background technique [0002] The modern power system is a typical high-dimensional, strong nonlinear dynamic large-scale system, with the main characteristics of large generating units, ultra-high voltage, long distance, heavy load, interconnection of large power grids, and combined AC and DC transmission. With the use of various new power equipment and the vigorous development and utilization of renewable energy (such as wind power, photovoltaic power generation, etc.), more and more micro-grids are formed and integrated into the main network, making power generation and transmission more economical and efficient. It also increases the scale, complexity and uncertainty of the power system. In this case, local faults in the power system (such as short-circuit faults, ground faults, load...

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Problems solved by technology

[0005] The UPFC system is a nonlinear system, and there are modeling errors in modeling, and the UPFC device is often affected by external uncertain disturbances during operation. Therefore, when the system is subject to large external disturbances and large (Feedback) linearized controllers do not provide satisfactory control when the range fluctuates

The direct Lyapunov finite-time control method and the synovial film variable structure control method are discontinuous control methods, which cannot retain the nonlinear physical structure characteristics of the UPFC system, and are prone to "chattering" phenomenon

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