A unified power quality regulator control method
A control method and power quality technology, applied in the direction of AC network voltage adjustment, electrical components, circuit devices, etc., can solve the problems of cost increase and high cost, and achieve the effect of reducing cost and DC bus capacity
Active Publication Date: 2022-07-26
STATE GRID ZHEJIANG ELECTRIC POWER CO LTD SHAOXING POWER SUPPLY CO +3
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Problems solved by technology
The above topology still does not jump out of the traditional UPQC structure. This structure is characterized by real-time compensation. For this reason, a large-capacity DC bus is required, which will greatly increase the cost
[0005] The real-time compensation of UPQC based on the traditional topology leads to high cost problems, such as figure 1 As shown, a new type of UPQC that aims to reduce the cost while meeting the voltage requirements is proposed. At the same time, it is necessary to propose a coordinated control method for the above-mentioned new type of UPQC topology
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[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0043]Due to the problem of high cost caused by the real-time compensation of UPQC based on traditional topology, a new type of UPQC is proposed to reduce the cost while meeting the needs of loads that do not require high voltage quality.
[0044] like figure 1 A ...
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The invention discloses a unified power quality regulator control method, comprising the following steps: step 1: generating a current compensation signal and a voltage compensation signal, and correspondingly generating the control signals of APF and DVR; step 2: calculating the effective value of the power supply voltage, The total harmonic distortion rate of the power supply voltage and the line current value; Step 3: Compare the three values calculated in Step 2 with the set response threshold to determine whether there is a related problem; Step 4: According to the judgment result in Step 3 , choose to switch APF and DVR, if the system has one or more of the problems of voltage drop, excessive voltage THD and open circuit, disconnect the high-speed switch, stop the APF output, and start the DVR output. If there is no problem with the system, then Close the high-speed switch, start APF output, stop DVR output. The compensation strategy of the UPQC of the present invention is an alternate compensation method, and the DVR part is not a real-time compensation, so that the voltage demand can be met with a substantial cost reduction.
Description
technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a power quality control technology of a distribution network. Background technique [0002] With the rapid development of modern society, precision instruments and sensitive users have gradually increased, and the requirements for power supply quality have been greatly improved; at the same time, with the rapid development of smart grids in recent years, a large number of equipment such as power electronic equipment and asynchronous motors Connecting to the power grid makes the harmonic and reactive power problems increase day by day. The voltage rise and fall and voltage and current harmonics caused by transient faults in the distribution network seriously affect the safety and reliability of power applications, and even cause a lot of economic losses. The Unified Power Quality Conditioner (UPQC) couples series Active Power Filters (APFs) and Parallel...
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IPC IPC(8): H02J3/16H02J3/18H02J3/01
CPCH02J3/16H02J3/1814H02J3/1842H02J3/01Y02E40/30
Inventor 蔡重凯俞永军赵越王轩洪金琪付永生葛昆明张旭阳陈晓宇王滔裘晓广金百荣
Owner STATE GRID ZHEJIANG ELECTRIC POWER CO LTD SHAOXING POWER SUPPLY CO