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Cascading-type STATCOM DC side capacitor voltage balance control method

A technology of DC side capacitance and control method, which is applied to flexible AC power transmission systems, electrical components, output power conversion devices, etc. The effect of increasing hardware cost, reducing control difficulty and improving reliability

Active Publication Date: 2014-05-21
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additional hardware circuits increase the complexity of the STATCOM circuit topology, increase the difficulty of control, reduce the reliability of the device, and increase the additional loss and cost of the device

Method used

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  • Cascading-type STATCOM DC side capacitor voltage balance control method
  • Cascading-type STATCOM DC side capacitor voltage balance control method
  • Cascading-type STATCOM DC side capacitor voltage balance control method

Examples

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Embodiment Construction

[0069] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0070] The STATCOM DC side capacitor voltage balance control method provided by the present invention is used to solve the control problem of the DC side capacitor voltage balance of a cascaded static synchronous compensator (Static Synchronous Compensator, STATCOM for short), and can also be used to solve other cascaded multi-voltage based control problems. DC voltage balance control problem for power electronics with flat inverter technology.

[0071] The H-bridge multilevel STATCOM includes three-phase six-bridge arms, and each phase is a cascaded H-bridge. like figure 2 shown, figure 2 It is a single-phase cascaded H-bridge multi-level STATCOM topology diagram. Each phase cascaded H-bridge includes a high-voltage bus, a low-voltage bus, a single-phase transformer T, a reactor L, a resistor Rs, N cascaded H-bridge units, N A ...

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Abstract

The invention relates to a cascading-type STATCOM (Static Synchronous Compensator) DC (Direct Current) side capacitor voltage balance control method. In the control method, the direct current control and the indirect current control are combined. The method comprises the following steps: generating an active current reference value; selecting a special bridge; generating an STATCOM output current reference value; carrying out indirect current control of the special bridge; and carrying out direct current control of a non-special bridge. The control method provided by the invention is used for controlling the cascading-type STATCOM DC side capacitor voltage balance. The method not only ensures the balance of a DC capacitor voltage between H bridges and improves the response speed of a control link and optimizes the system performance, but also does not require an additional hardware circuit and cannot ensure the hardware cost of a STATCOM device to be increased.

Description

technical field [0001] The invention relates to solving the control problem of the DC side capacitor voltage balance of a cascaded static synchronous compensator STATCOM (Static Synchronous Compensator, STATCOM for short), in particular to a control method for the DC side capacitor voltage balance of a cascaded STATCOM. Background technique [0002] At present, STATCOM reactive power control is divided into two categories: direct current control and indirect current control. Direct current control, using tracking PWM control technology to feedback control the instantaneous value of the current waveform, and directly control the generation of the command current. Indirect current control is to indirectly control the AC side current of the STATCOM by controlling the phase and amplitude of the AC voltage fundamental wave generated by the STATCOM inverter. Since the direct current control method is to track the instantaneous value of the current, when the switching frequency ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02M1/32
CPCY02E40/16Y02E40/10
Inventor 戴朝波吉平武守远
Owner STATE GRID CORP OF CHINA
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