Novel non-linear robustness 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 novel nonlinear robust control system of a unified power flow controller, in particular to the technical field of flexible alternating current transmission. Background technique [0002] The modern power system is a typical high-dimensional, strongly nonlinear dynamic large system, characterized by large units, ultra-high voltage, long distances, heavy loads, 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 incorporated into the main grid, making power generation and transmission more economical and efficient. At the same time, 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 dips,...

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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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