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Upfc Chattering Control Method with Additional Disturbance Observer

A technology of interference observer and control method, which is applied to AC network circuits, electrical components, circuit devices, etc., can solve problems such as weak robustness, high requirements for system mathematical modeling, and difficulty in obtaining satisfactory control effects. Strong robustness, strong robustness, and the effect of improving system transient stability

Active Publication Date: 2017-10-24
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0006] 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.

Method used

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  • Upfc Chattering Control Method with Additional Disturbance Observer
  • Upfc Chattering Control Method with Additional Disturbance Observer
  • Upfc Chattering Control Method with Additional Disturbance Observer

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0028] Principle of the present invention is specifically described as follows:

[0029] (1) The first part of the technical solution: the disturbance observer based on sliding mode variable structure control needs to be controlled in the decoupled system state space, and the parallel side and series side systems in the two-phase rotating coordinate system are respectively established by using coordinate transformation Equation of state:

[0030]

[0031]

[0032] Among them: i Ed i Eq i Bq i Bd is the state variable, u 1d , u 1q , u 2d , u 2q is the controller input.

[0033] L E and R E Indicates the equivalent inductance and resistance of the UPFC shunt transformer and the c...

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Abstract

The invention is a UPFC chattering control method with an additional disturbance observer, which establishes the coupling state space of the coupling system on the parallel side and the series side, simplifies the system through feed-forward decoupling, and introduces two signals that reflect system disturbance and chattering caused by control switching. First-order disturbance observer, combined with the decoupling simplified system to establish a 4th-order state estimation space considering the disturbance, using the method of sliding mode variable structure control, designing a first-order linear sliding mode variable structure controller to control the 4th-order state estimation system, realizing The independent control of state variables realizes the function of system power flow control; this method can improve the transient stability of the system, and has strong system damping characteristics and fast error disturbance quiescence characteristics; it can realize power decoupling control When the control is switched, it can still provide a large damping for the system, quickly suppress the system oscillation, maintain the system state variables at the target value, and have good adaptability and robustness.

Description

technical field [0001] The invention relates to a control method for suppressing chattering after interference of a unified power flow controller, which is used to improve the transient stability of the unified power flow controller. It belongs to the technical field of power electronic control. Background technique [0002] 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 transmission line. Its basic components are the static synchronous compensator (STATCOM) and the static synchronous series compensation device (SSSC) and the DC capacitor in between. [0003] The steady-state control of UPFC has been studied a lot at home and abroad. However, due to the high-speed shut-off and conduction of the converter valve during UPFC operation, there will be disturbances in the control system. In addition, when the AC system fails or disturbances, the boundary condit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 卫鹏刘建坤周前张宁宇汪成根朱鑫要嵇托
Owner STATE GRID CORP OF CHINA
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