A kind of upfc control method based on neural network sliding mode control

Abstract

The invention provides an UPFC control method based on nerve network sliding mode control, which utilizes a converter targeting a parallel connection side and a serial connection side, and, on the basis of the vector control, constructs the state space of the parallel connection side and the serial connection side of the converter, adopts the radial basic function (RBF) nerve network algorithm and the momentum factor based on the classic gradient decedent algorithm to perform regulation on the hidden layer node center, the node width and the network weight value. The UPFC control method disclosed by the invention can realize the whole process adaptive control of the sliding mode state, removes the sensitivity of the sliding mode control to the external parameters, realizes the decoupling control of the active power and the reactive power, inhibits the oscillation during the system interference, and fast approaches the object value of the system operation. The structure is simple and the operation is reliable, and has good adaptability and robustness. The invention makes up the blanket in the field and provides necessary technical support and the beneficial reference to the improvement of unifying power flow controller stable control system.

Description

technical field [0001] The invention relates to a control method of a unified power flow controller (UPFC) converter, belongs to the technical field of power electronic control, and specifically relates to a UPFC control method based on neural network sliding mode control. Background technique [0002] The concept of Unified Power Flow Controller (UPFC for short) was first proposed by L. Gyugyi et al. in 1992. The research on UPFC abroad was earlier. In 1998, the first device in the world was installed in 138kV in the United States. The successful operation of the high-voltage transmission line is enough to show that the hardware implementation of UPFC is completely feasible, and the current project is running well. However, our country started relatively late, and began to study after 1995. [0003] As a series-parallel hybrid FACTS element, the unified power flow controller (UPFC) can flexibly control the power flow distribution and node voltage on the controlled transmis...

AI Technical Summary

Problems solved by technology

[0005] The UPFC converter control method that has been adopted so far is mainly based on the classic PI control theory, which requires high mathematical modeling of the system, and it is difficult to obtain a satisfactory control effect, and its robustness is not strong.

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