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Inverter auxiliary power supply system and method

A technology of auxiliary power supply and power supply system, which is applied in the direction of emergency power supply arrangement, irreversible AC power input conversion to DC power output, electrical components, etc., to achieve the effect of reducing equipment volume, reducing equipment cost, and ensuring continuity of power supply

Inactive Publication Date: 2015-05-06
NR ELECTRIC CO LTD +1
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  • Application Information

AI Technical Summary

Problems solved by technology

It can not only solve the problem of power supply capacity demand for high-power impact loads, reduce the capacity of the power supply system to reduce power supply costs; but also ensure the continuity of power supply for the control system during low-voltage ride-through

Method used

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  • Inverter auxiliary power supply system and method
  • Inverter auxiliary power supply system and method
  • Inverter auxiliary power supply system and method

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Embodiment Construction

[0036] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0037] Such as figure 1 As shown, the invention discloses an inverter auxiliary power supply system, comprising an isolation conversion device (1), a DC bus (2), an energy storage circuit (3), and two sets of load circuits (4).

[0038] Among them, the energy storage circuit (3) includes an energy storage element (7), a current limiting element (8), and a discharge element (9); among the two sets of load circuits (4): the first load circuit (5) is a low-power ordinary load , the second load circuit (6) is a high-power impact load.

[0039] The present invention provides an energy storage circuit (3), which can not only solve the power supply capacity demand problem of high-power impact loads, reduce the power supply system capacity and thereby reduce the power supply cost, but also ensure the continuity of power supply of the control system...

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Abstract

The invention discloses an inverter auxiliary power supply system and a use method thereof. The inverter auxiliary power supply system comprises an isolating conversion device, a direct current bus, a tank circuit and two load circuits. The tank circuit comprises an energy storage element, a current limiting element and a discharge element. The first load circuit is a low-power general load and the second load circuit is a high-power impact load. The tank circuit is arranged for ensuring the continuity of control system power supply during low voltage riding through as well as solving the problem of power supply capacity requirements of the high-power impact load and reducing the capacity of the power supply system for reducing power supply costs. The current limiting element is used for slowly charging the energy storage element for further limiting the system power. The discharge element is used for quickly discharging to the direct current bus for further ensuring the continuity of power supply of other load circuits. The inverter auxiliary power supply system and the use method of the inverter auxiliary power supply system gives full play to the utilization efficiency of the energy storage element in a variety of working states and is simple in scheme and easy to implement.

Description

technical field [0001] The invention belongs to the field of distributed power generation, in particular to an inverter auxiliary power supply system and method. Background technique [0002] The grid-connected capacity of distributed power generation is increasing, and the grid-connected requirements of inverters are becoming more and more stringent. In order to prevent a large area of ​​the inverter from being disconnected from the grid in the event of a short-term fault in the power grid, the requirements for the low voltage ride through of the inverter are getting higher and higher. The term "low voltage ride through" refers to that when the grid voltage drops to a certain level or even reaches 0 for a short time, the inverter is not allowed to stop within the scope of meeting the low voltage ride through curve, and at the same time, it must inject reactive current into the grid to support the grid Voltage recovery (for example, GB19964-2012 requires low-voltage ride-th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/00H02M7/02
Inventor 李旭李臣松尹春米高祥郭勇王景霄
Owner NR ELECTRIC CO LTD
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