Uninterruptible Power Supply System and Its Output Voltage Harmonic Suppression Circuit
A technology for suppressing output voltage and harmonics, which is applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., and can solve problems such as inability to meet high-quality power supply requirements and large harmonic components of output voltage
Active Publication Date: 2019-05-17
EAST GRP CO LTD
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Problems solved by technology
When the traditional uninterruptible power supply system supplies power to the load of the data center, the harmonic component of the output voltage is relatively large, so that the quality of the output power cannot meet the demand for high-quality power supply
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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0025] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be intervening elements at the same time. In contrast, when an element is referred to as being "directly" connected to another element, there are no intervening elements present.
[0026] see figure 1 , the output voltage harmonic suppression circuit is used to suppress the preset harmonic voltage component in the output voltage of the uninterruptible power supply system, so that the harmonic value of the output voltage of the uninterrupt...
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An output voltage harmonic suppression circuit, comprising: a total harmonic voltage component extraction circuit, used to extract the total harmonic voltage component signal in the output voltage in real time; and a preset harmonic voltage suppression circuit, including harmonic voltage component extraction module; a gain control module, which is used to determine a real-time gain amplification factor; a gain amplification module; and a signal conversion module; the output voltage harmonic suppression circuit also includes a summation circuit, which is used to output the preset subharmonic voltage suppression circuit The sub-harmonic voltage compensation commands are summed to form a total harmonic voltage compensation command signal and then output to the control circuit of the uninterruptible power supply system. The above-mentioned output voltage harmonic suppression circuit can quickly suppress the preset sub-harmonic voltage component in the output voltage within the preset sub-harmonic voltage target distortion degree, so as to meet the requirement of the uninterruptible power supply system for power supply with high power quality for loads.
Description
technical field [0001] The invention relates to the field of power supply technology, in particular to an uninterruptible power supply system and an output voltage harmonic suppression circuit thereof. Background technique [0002] With the rapid growth of power loads in data centers in recent years, the requirements for energy efficiency indicators are getting higher and higher, so the requirements for the power quality output by uninterruptible power supply systems are also getting higher and higher. When a traditional uninterruptible power supply system supplies power to data center loads, the harmonic component of its output voltage is relatively large, resulting in the quality of its output power not meeting the demand for high-quality power supply. Contents of the invention [0003] Based on this, it is necessary to provide an uninterruptible power supply system and an output voltage harmonic suppression circuit capable of supplying power to loads with high power qua...
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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 张涛于玮徐海波
Owner EAST GRP CO LTD