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Method and device for determining phase angle compensation quantity, inverter and paralleled UPS system

A compensation amount and inverter technology, applied in the control field, can solve the problems such as the inability to adjust the phase angle compensation amount in time and the deterioration of the current average degree of the parallel UPS system.

Active Publication Date: 2015-03-25
EMERSON NETWORK POWER CO LTD
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Problems solved by technology

[0005] The embodiment of the present invention provides a method, a device, an inverter and a parallel UPS system for determining the amount of phase angle compensation, so as to solve the problem that the existing method cannot adjust the slaves in time when the load of the parallel UPS system changes. The amount of phase angle compensation may lead to the problem of poor flow uniformity of the parallel UPS system

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  • Method and device for determining phase angle compensation quantity, inverter and paralleled UPS system
  • Method and device for determining phase angle compensation quantity, inverter and paralleled UPS system
  • Method and device for determining phase angle compensation quantity, inverter and paralleled UPS system

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Embodiment Construction

[0025] In a parallel UPS system, under normal circumstances, the tracking source that the master can choose is bypass, local oscillator, etc., and the tracking source that the slave can choose is bypass and system output voltage. figure 1 Taking the master tracking the bypass and the slave tracking the output voltage of the system as an example to illustrate the phase locking and phase control of the parallel system, the system includes multiple online UPSs.

[0026] Among them, the host MASTER samples the bypass voltage signal BpAC through the capture unit Capture, and obtains the frequency and zero-crossing point of the bypass voltage signal BpAC. The zero-crossing point contains the initial phase information of the bypass voltage signal BpAC, which is equivalent to obtaining the bypass voltage signal BpAC. Frequency Δf bp and phase angle Δθ bp , and then the frequency Δf of the bypass voltage signal BpAC obtained by the capture unit Capture bp and the frequency Δf output ...

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Abstract

The embodiment of the invention provides a method and device for determining the phase angle compensation quantity, an inverter and a paralleled uninterrupted power supply (UPS) system. The problems that when a load carried with a UPS system with a slave in the existing method changes, the phase angle compensation quantity cannot be adjusted in time, and the current balance degree of the paralleled UPS system can be probably poor are solved. The method comprises the steps that the parallel operation ring current of the slave at the current moment is determined according to the difference of the output current of the inverter of the slave, for tracking a system output voltage, in the paralleled UPS system at the current moment and the uniform system current at the current moment; the phase angle compensation quantity of the inverter in the slave in a lock phase of the current moment is determined according to the active component and / or the reactive component in the parallel operation ring current of the slave at the current moment.

Description

technical field [0001] The invention relates to the technical field of control, in particular to a method, a device, an inverter and a parallel uninterruptible power supply UPS system for determining a phase angle compensation amount. Background technique [0002] In a parallel UPS (Uninterruptible Power Supply, uninterruptible power supply) system, due to the inconsistency of the phase-frequency characteristics of the inductors, capacitors and analog low-pass filters in different UPSs, the current transformers and stand-alone control strategies in different UPSs are inconsistent, resulting in parallel Different inverters in the UPS system have different output voltage phases, which will cause circulating current in the parallel UPS system and directly lead to the deterioration of the current sharing degree of the parallel UPS system. Therefore, in the parallel UPS system, when the slave is used to track the output voltage, the structure of phase angle compensation is includ...

Claims

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Application Information

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IPC IPC(8): H02J9/06H02M7/42
Inventor 杜翠卓清锋陈文进张贺军
Owner EMERSON NETWORK POWER CO LTD
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