MMC-STATCOM unbalance load compensation control method based on bridge arm current

An MMC-STATCOM, load balancing technology, applied in the power field, to achieve the effect of strong robustness, suppression of double frequency fluctuation, and easy implementation

Pending Publication Date: 2017-08-01
GUIZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to propose a MMC-STATCOM unbalanced load compensation control method based on the bridge arm current to control the MMC AC side current and the MMC internal circulation in a unified manner to simplify the overall complexity of the control system. To ensure the steady-state operation of the MMC and to respond faster to the comprehensive compensation for unbalanced loads

Method used

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  • MMC-STATCOM unbalance load compensation control method based on bridge arm current
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  • MMC-STATCOM unbalance load compensation control method based on bridge arm current

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings, but not as any limitation to the present invention.

[0037] see Figure 1-6 As shown, the method of the present invention uses a unified current controller based on the MMC bridge arm current to achieve simultaneous control of the MMC-STATCOM AC side current and the unbalanced current inside the MMC, which will be described in detail below in conjunction with the accompanying drawings.

[0038] figure 1 For the MMC-STATCOM structure diagram, the KVL equation is established, which can be obtained

[0039]

[0040]

[0041] Define the upper and lower arm voltage e pk 、e nk The difference is half the MMC output voltage e k , (k=a, b, c, the same below)

[0042]

[0043] Define the upper and lower arm current i ap i an It is the sum of half of the MMC AC side current and the unbalanced current inside the MMC

[0044]

[0045]

[0046] refer...

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Abstract

The invention discloses an MMC-STATCOM unbalance load compensation control method based on bridge arm current. Unbalanced current is tracked in real time and quickly responds, reactive and negative sequence components in power grid current can be compensated, unbalanced current inside an MMC can also be inhibited to maintain the balance of sub-module capacitor voltage, the operational efficiency of a current converter is improved while stable operation of the MMC is guaranteed, the method is suitable for any phase of MMC, and the robustness is high so as to overcome disadvantages in the prior art.

Description

technical field [0001] The invention relates to a static synchronous compensator based on a modular multilevel converter, in particular to an MMC-STATCOM unbalanced load compensation control method based on a bridge arm current, which belongs to the field of electric power technology. Background technique [0002] In the field of actual medium and low-voltage distribution networks, there will be a grid voltage unbalanced state. For example, the asymmetric distribution of single-phase loads (single-phase electric traction systems, public facility loads, and rural electrical systems, etc.) will lead to unbalanced grid levels. The generation of negative sequence components affects the transmission of power quality. At the same time, the unbalanced load will also bring about the decline of power factor, and the increase of line loss and thermal effect in the power system. Therefore, it is very important to develop a device that can comprehensively compensate reactive power and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26
CPCH02J3/26Y02E40/50Y02E40/10
Inventor 李婧
Owner GUIZHOU UNIV
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