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Control method and control system of single-phase inverter

A single-phase inverter and control method technology, applied in the field of power supply, can solve the problems of high cost and large number of hardware, and achieve the effect of saving hardware cost

Active Publication Date: 2013-08-07
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a control method for a single-phase inverter that uses only one current sensor for current detection in view of the above-mentioned defects of large number of hardware and high cost in the prior art

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  • Control method and control system of single-phase inverter

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Embodiment Construction

[0035] In order to save hardware costs and meet the requirements of inverter output performance and logic judgment load, the present invention conceives a current detection scheme and an inverter control scheme using a current sensor. The present invention cleverly changes the current detection circuit while simultaneously slave software The above realizes the inverter voltage, the instantaneous value control of the capacitor current and the load calculation under the single current sensor hardware circuit.

[0036] image 3 It is a schematic diagram of the single-phase inverter current detection circuit of the present invention. Such as image 3 As shown, the inductor current detection and the load current detection multiplex a current sensor CT. The current sensor CT has two primary sides. One primary side is connected to the inverter filter capacitor circuit, and the other primary side is connected after the output relay. The current sampled by the current sensor CT is the vec...

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Abstract

The invention relates to a control method and a control system of a single-phase inverter. The control method comprises the following steps of: detecting the inverted inductive current to be used for inverted progressive limiting current by using two primary current transducers (CT); calculating the capacitance current by using a difference method, and indirectly calculating the load current according to a formula to be used for calculating load power; meanwhile, using the calculated capacitance current as the negative feedback of a current ring to realize two closed loop control of inverted voltage and capacitance current. Current detection can be completed by using a single current transducer, and the instantaneous value control and the load capacity calculation of the inverted voltage and the capacitance current under a single CT hardware circuit can be realized on software; thus, hardware cost is saved.

Description

Technical field [0001] The present invention relates to power supply technology, and more specifically, to a control method and control system of a single-phase inverter. Background technique [0002] The traditional single-phase inverter adopts double closed loop control of voltage and current, and its algorithm needs to detect the inverter inductor current and load current. Inverter inductor current is used for current inner loop negative feedback and hardware wave-by-wave current limiting, load current is used to calculate inverter load and do current inner loop feedforward, so two current sensors are required on the hardware, such as figure 1 As shown, the first current sensor CT1 is used to detect the inductor current, and the second current sensor CT2 is used to detect the load current. [0003] figure 2 It is the block diagram of the traditional single-phase inverter control system. figure 2 Middle i L (s) is the inductor current, i O (s) is the load current, G V (s) is th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M7/537
Inventor 刘小刚罗建震
Owner VERTIV CORP