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High voltage variable frequency low voltage ride through method

A low-voltage ride-through and high-voltage frequency conversion technology, which is applied in the field of frequency converters, can solve problems such as high-voltage motor shutdown and power grid voltage drop in the factory, and achieve the effects of low power consumption, low cost and reliable operation

Inactive Publication Date: 2016-05-18
ANHUI EHE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Some enterprises, especially those with internal waste heat power generation projects, are prone to large voltage drops in the power grid due to power generation and grid connection, which will cause high-voltage inverters to stop working and high-voltage motors to stop

Method used

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  • High voltage variable frequency low voltage ride through method

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Embodiment Construction

[0011] Such as figure 1 As shown, a high-voltage variable-frequency low-voltage ride-through method includes a unidirectional conduction circuit 1 and a capacitor energy storage circuit 2. The unidirectional conduction circuit 1 is composed of diodes D1 and D2, and the capacitor energy storage circuit 2 is composed of Composed of capacitors C3, C4 and C5 to improve the withstand voltage performance of the system, the anode of the diode D1 is connected to the positive pole of the DC bus, the capacitors C3, C4 and C5 are connected in series on the cathode, and then connected to the anode of the diode D2, The cathode of the diode D2 is connected to the negative pole of the DC bus, and a bridge circuit 3 composed of four IGBTQ1, Q2, Q3 and Q4 is connected between the positive and negative poles of the DC bus. The IGBTQ1, Q2, Q3 and Q4 Diodes D3, D4, D5 and D6 are connected in parallel respectively, and the front end of the bridge circuit 3 is also connected in parallel with capaci...

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Abstract

The invention discloses a high-voltage inverter low-voltage ride through method which comprises a unidirectional conducting circuit and a capacitor energy storage circuit, wherein the unidirectional conducting circuit consists of two diodes; the capacitor energy storage circuit consists of three groups of capacitors; the capacitor energy storage circuit is charged through the unidirectional conducting circuit by the voltage on a direct-current bus; the capacitor energy storage circuit supplies power for a control part; when the short-time fault of power grid voltage leads the voltage to be dropped off, the unidirectional conducting circuit enables the capacitor energy storage circuit not to discharge electricity to the direct-current bus, the control circuit part is kept to operate normally and to drive an IGBT (insolated gate bipolar transistor) to be conducted; when the current impact is too high, the control part regulates the duty ratio of IGBT conduction, so that the circuit recovers the normal operation. The high-voltage inverter low-voltage ride through method provided by the invention has the advantages of reliability in operation, low power consumption, low cost and the like.

Description

technical field [0001] The invention relates to a frequency converter, in particular to a high-voltage frequency conversion low-voltage ride-through method. Background technique [0002] With the development of power electronics technology and the deepening of high-voltage inverter technology research, high-voltage inverters are increasingly widely used in the drive systems of high-power mechanical equipment such as fans, water pumps, and compressors, especially cascaded high-voltage inverters. Frequency converters that are suitable for China's national conditions and have excellent performance are becoming more and more popular, which shows that they are in the ascendant. [0003] Some enterprises, especially those with internal waste heat power generation projects, are prone to large voltage drops in the power grid due to power generation and grid connection, which will cause high-voltage inverters to stop working and high-voltage motors to stop. This is not allowed in so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J9/00
CPCY02B70/30Y04S20/20
Inventor 唐韦韦杨春正蔡珊珊赵娟沈庆赵洁栾振虎姚俊马志保
Owner ANHUI EHE NEW ENERGY TECH