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A Synchronous Static Compensator Improved Second-Order Sliding Mode Control Method

A static compensator, second-order sliding mode technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, single-network parallel feeding arrangement, etc. Disturbance performance is poor and other problems, to achieve the effects of enhancing system robustness, reducing voltage overshoot, and quickly stabilizing voltage

Active Publication Date: 2022-08-02
国网浙江瑞安市供电有限责任公司第二名称：瑞安市供电局 +1
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Problems solved by technology

The inverse system method can decouple the linearization of the original system, and introduce a PI controller to realize the decoupling of active current and reactive current. However, there are disadvantages of low control accuracy and poor anti-disturbance performance.
The sliding mode can realize the nonlinear control of the current and DC voltage of the synchronous static compensator. The traditional first-order sliding mode has the problems of control discontinuity and inherent chattering, which affects the control effect of the system.

Method used

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  • A Synchronous Static Compensator Improved Second-Order Sliding Mode Control Method
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  • A Synchronous Static Compensator Improved Second-Order Sliding Mode Control Method

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Embodiment Construction

[0028] The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

[0029] figure 1 It is a schematic diagram of the circuit topology of the synchronous static compensator. The three-phase inverter consists of 6 insulated gate bipolar transistors. Ug is the grid voltage, Uea, Ueb, and Uec are the A, B, and C phase voltages at the common coupling, respectively. I1a , I1b, I1c are the A, B, C phase currents respectively, Isa, Isb, Isc are the A, B, C phase compensation currents respectively, Udc is the DC side capacitor voltage value, C is the DC filter capacitor value, Ua, Ub, Uc Inverting the AC voltage, L and R are the connection inductance and resistance, respectively. The inverter injects rea...

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Abstract

The invention relates to an improved second-order sliding mode control method for a synchronous static compensator, which adopts a reactive current controller and a DC side capacitor voltage controller, and the reactive current control adopts a sliding mode controller designed based on a super-helix algorithm, The low-order term introduces a linear compensation term to improve the reactive current controller; the DC-side capacitor-voltage controller adopts a sliding mode controller designed based on the super-helix algorithm, and the designed sliding mode surface introduces linear compensation for the low-order term and the high-order term respectively. Item, DC side capacitor voltage controller. The advantages are: accurate control of reactive power compensation current, no chattering output, improved reactive power compensation current dynamic response capability, improved dynamic response capability of step compensator DC side capacitor voltage, reduced output chattering, the above two The application of this kind of controller to the synchronous static compensator control system can realize the rapid stability of the voltage at the common coupling, reduce the voltage overshoot and enhance the robustness of the system.

Description

technical field [0001] The invention relates to an improved second-order sliding mode control method for a synchronous static compensator. Background technique [0002] Synchronous static compensator is a new type of reactive power compensation device with voltage type or current type three-phase bridge converter as the core. It has the functions of reactive power compensation, suppression of voltage flicker and three-phase unbalance, etc. Compared with the traditional static reactive power compensation device, it has many advantages such as wide operation range, compact structure, rapid reactive power compensation, and is not easy to occur resonance. It has become a flexible power system. Hot spots in the field of AC power transmission. [0003] Synchronous static compensator is a complex nonlinear strong coupling system, and the control system becomes the key to affect the operating characteristics of the synchronous static compensator. The inverse system method can perf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/26H02J3/38H02M7/5387
CPCH02J3/1821H02J3/26H02J3/381H02M7/5387Y02E40/50Y02E40/30
Inventor 林文威董敏何顺勇黄晓波刘舒怡张浩
Owner 国网浙江瑞安市供电有限责任公司第二名称：瑞安市供电局
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