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Control method for reducing low-voltage ride-through off-network of high-voltage cascade SVG

A low-voltage ride-through, high-voltage cascade technology, applied in the direction of AC network voltage adjustment, electrical components, circuit devices, etc., can solve problems such as easy disconnection, ensure safety and reliability, improve the ability of devices to connect to the grid, and reduce failures Effects of off-grid problems

Pending Publication Date: 2021-12-14
南京智睿能源互联网研究院有限公司
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Problems solved by technology

[0004] In order to solve the problem that the high-voltage cascaded SVG is easy to disconnect from the grid during low-voltage ride-through, the present invention proposes a control method for reducing the high-voltage cascaded SVG low-voltage ride-through disconnection

Method used

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  • Control method for reducing low-voltage ride-through off-network of high-voltage cascade SVG
  • Control method for reducing low-voltage ride-through off-network of high-voltage cascade SVG
  • Control method for reducing low-voltage ride-through off-network of high-voltage cascade SVG

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Embodiment

[0028] see figure 1 , the present invention is a control method for reducing high-voltage cascaded SVG low-voltage ride-through off-grid, specifically comprising the following steps:

[0029] (1) The grid voltage is sampled, and the phase-locked loop performs phase tracking on the grid voltage, decomposes the voltage to obtain the voltage active component Vd and the voltage reactive component, and decomposes the current to obtain the current active component and the current reactive component;

[0030] (2) Determine whether the active component Vd of the voltage obtained by the phase-locked loop is greater than the set voltage value of the sliding filter that enables the calculation of the angular frequency. If Vd is greater than the set voltage value of the sliding filter that enables the calculation of the angular frequency, the grid voltage obtained by phase-locking The angular frequency W is subjected to sliding filtering processing to obtain the sliding average filtering ...

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Abstract

The invention discloses a control method for reducing low-voltage ride-through off-network of a high-voltage cascade SVG, and relates to the technical field of power equipment. The method comprises the steps of power grid voltage detection, power grid voltage phase locking, acquisition of a ratio of a voltage active component to a rated voltage, in-out low-voltage-crossing logic judgment, power grid angular frequency moving average processing logic, low-voltage-crossing blocking drive quitting to avoid overcurrent off-network logic, and bus voltage balance control under asymmetric drop. At the moment that the voltage of the power grid drops, the method can quickly and effectively detect low voltage ride-through and send out reactive current corresponding to the voltage of the power grid to support the power grid, and when the low voltage ride-through state is quitted, the problem of low voltage ride-through off-grid is effectively reduced, the grid-connected operation capability of the device is greatly improved, and the safety and reliability of new energy access to the power grid are ensured.

Description

technical field [0001] The invention belongs to the technical field of electric equipment, and in particular relates to a control method for reducing high-voltage cascaded SVG low-voltage ride-through disconnection. Background technique [0002] In order to reduce the emission of greenhouse gases, more and more clean energy sources are connected to the grid, such as wind power, photovoltaic and other clean energy sources. Stability, power electronic devices have the characteristics of non-linearity and small inertia, which leads to distortion and instability of grid voltage. Static synchronous compensator (SVG) is widely used to improve power factor and grid voltage. Compared with passive compensator, it has the advantages of continuous power regulation and fast dynamic response. In addition, cascaded SVG is often used in 1KV-50KV medium voltage level Power system, because of its transformerless, multi-level and modular advantages, the high-voltage cascaded star configurati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16H02J3/38H02J3/48H02J3/50
CPCH02J3/16H02J3/381H02J3/48H02J3/50H02J2300/20Y02E40/10Y02E40/30
Inventor 王璐霍利杰杨忠浩李芳芳刘猛虞剑文
Owner 南京智睿能源互联网研究院有限公司
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