An npc three-level converter control power supply system
A technology of power supply system and control power supply, which is applied in the direction of control/regulation system, regulation of electric variables, emergency power supply arrangement, etc., which can solve the problems of being unable to meet the power supply requirements of low-cost control power supply of NPC three-level converters, and achieve cost reduction Effect
Active Publication Date: 2022-03-15
江苏国科智能电气有限公司 +1
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Problems solved by technology
The current technology cannot meet the low-cost control power supply requirements of NPC three-level converters
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[0029] The present invention is further described below with reference to the accompanying drawings and specific embodiments.
[0030] The typical topology of the NPC three-level converter applying the present invention is as follows: figure 1 As shown, the control power supply system of the present invention passes through the high-voltage positive terminal X HP , high voltage zero terminal X HO , High voltage negative terminal X HN from figure 1 The NPC three-level converter shown is powered by the DC bus, where the high voltage positive terminal X HP Connect to the positive bus of the NPC three-level converter, such as figure 1 Medium 100, high voltage zero terminal X HO Connect to the neutral bus of the NPC three-level converter, such as figure 1 Middle 101, high voltage negative terminal X HN Connect to the negative bus of an NPC three-level converter, such as figure 1 Medium 102. The control power supply system through X LP , X LO The terminal outputs 24VDC vo...
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An NPC three-level converter control power supply system includes two parts, a main circuit and a control unit. The main circuit adopts a full-bridge double push-pull isolated DC / DC topology, which is composed of a high-voltage side circuit, an isolation transformer and a low-voltage side circuit. The isolation transformer has a common core four-winding structure, the first winding and the second winding on the high-voltage side are connected to form a push-pull structure, and the third and fourth windings on the low-voltage side are connected to form a push-pull structure; the high-voltage side of the main circuit is connected through X HP 、X HO 、X HN The terminals are respectively powered from the positive busbar, zero busbar and negative busbar of the NPC three-level converter. The AC terminals of the two bridge arms of the full bridge circuit are respectively connected to the first terminal X of the first winding of the isolation transformer. 11 and the second winding tail X 22 , the series connection point X of the two windings on the high voltage side 121 Connect to neutral point N O ; The control unit includes four links of voltage closed-loop control, sawtooth wave generation, first-level PWM generation and second-level PWM conditioning distribution, through the control to make the G of the full bridge circuit 1 G 4 and G 2 G 3 Interval switching period T s It is turned on alternately with the duty cycle D to realize power energy conversion and output voltage control.
Description
technical field [0001] The invention relates to an NPC three-level converter control power supply system. Background technique [0002] New energy power generation methods such as wind power and photovoltaic power generation based on wind energy and solar energy are an effective way to solve future energy problems. However, wind energy and solar energy have the characteristics of intermittence, volatility and randomness, and a certain capacity energy storage system needs to be equipped to solve the problem of active power balance of the grid caused by large-scale new energy grid-connected power generation. The converter is a key device in wind power generation, photovoltaic power generation and energy storage systems, and plays a decisive role in meeting the adaptability of the power grid. The device can reduce the material cost of the system to a certain extent and has been widely used. [0003] In order to meet the adaptability requirements of the power grid, the convert...
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IPC IPC(8): H02M7/487H02M3/337H02J9/06
CPCH02M7/487H02M3/3376H02J9/062
Inventor 吕佃顺武鑫王立鹏冯莉马强赵世雄张彦欢汪浩赵栋利
Owner 江苏国科智能电气有限公司