Distribution network distributed flexible voltage regulation topological structure based on AC-AC converter
A topology structure and converter technology, applied in the field of distributed flexible voltage regulation topology structure of distribution network, can solve the problem that the DC energy storage unit increases the size and cost of the equipment, cannot achieve deep, long-term voltage regulation, and cannot meet the Voltage real-time tracking compensation and other issues to achieve the effect of improving power supply quality, reducing volume and cost, and high precision
Inactive Publication Date: 2019-06-11
STATE GRID LIAONING ELECTRIC POWER CO LTD SHENYANG POWER +2
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Problems solved by technology
Although the voltage quality of the distribution network has received great attention, in the current practical application of voltage regulation in the distribution network, voltage regulation through reactive power compensation devices and transformer taps has limited voltage regulation range, poor adaptability, and low sensitivity. The problem is that it cannot meet the requirements of real-time voltage tracking and compensation, and is not suitable for some precision instruments and sensitive equipment; although the dynamic voltage regulator can realize the function of real-time regulation of the voltage of electrical equipment, the voltage regulation range is limited, and it cannot be deep. , long-term voltage regulation, and the existence of DC energy storage units increases the size and cost of equipment
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[0011] As shown in the figure, on the one hand, the power frequency double-split transformer plays the role of electrical isolation, and on the other hand, it can provide input voltage for the dual step-down / boost AC-AC converter module. The two windings on the low-voltage side are respectively connected to the dual buck / boost AC-AC converter module, and the positions of the two windings on the low-voltage side with the same name are different, so the power frequency The double-split transformer can provide input voltages with different polarities for the dual step-down / boost AC-AC converter module, wherein the transformation ratio of the power frequency double-split transformer is N 1 :N 2 :N 3 .
[0012] The dual buck / boost AC-AC converter module adopts a new topology structure, which solves the commutation problem of traditional AC-AC converters, and can ensure safety and reliability even if the input voltage or current has large harmonic content and large distortion run...
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The invention discloses a distribution network distributed flexible voltage regulation topological structure based on a novel direct AC-AC converter. The distribution network distributed type flexiblevoltage regulation topological structure comprises a power frequency double-split transformer, double-voltage reduction / voltage boost type AC-AC converter modules, L and C filters, and a bypass switch S, wherein the double-split transformer is connected with a single phase of the distribution network in parallel and provides an input voltage for the two double-voltage reduction / voltage boost typeAC-AC converter modules; and the double-voltage reduction / voltage boost type AC-AC converter modules are coupled with the power frequency double-split transformer in a serial connection mode, so thatthe single-stage power conversion of the bipolar voltage AC to AC is realized. In addition, due to the adoption of the double-voltage reduction / voltage boost type AC-AC converter modules, a bidirectional switch does not need to be adopted, and the problem of current conversion of the traditional AC-AC converter is solved. The L and C filters are used for filtering off high-frequency harmonic components generated by the double-voltage reduction / voltage boost type AC-AC converter modules, so that the quality of the output voltage is guaranteed.
Description
technical field [0001] The invention relates to the technical field of power distribution and voltage regulation in distribution network operation, in particular to a distributed flexible voltage regulation topology structure of a distribution network based on a novel direct AC-AC converter. Background technique [0002] With the rapid development of the national economy and the rapid growth of load, the problem of poor power quality of distribution network caused by voltage drop and sudden rise of distribution network has become increasingly prominent. Voltage drops and sudden rises will affect the normal operation of user electrical equipment, especially the safe and stable operation of sensitive loads such as industrial process control, precision instruments, and computer systems. Although the voltage quality of the distribution network has received great attention, in the current practical application of voltage regulation in the distribution network, voltage regulation ...
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IPC IPC(8): H02J3/12
Inventor 冯喜强
Owner STATE GRID LIAONING ELECTRIC POWER CO LTD SHENYANG POWER