Bidirectional converter control device
A bidirectional converter and control device technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, AC network load balancing, etc., can solve large power grid failure, grid harmonic pollution, grid fluctuations, etc. question
Inactive Publication Date: 2014-09-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
However, with the expansion of scale, the impact of distributed generation on the grid is also increasing
The connection of various distributed power generation systems will cause harmonic pollution of the power grid, which will have a negative impact on the large power grid; secondly, the distributed power generation system is greatly affected by factors such as weather, seasons, and daylight, and the power supply is unstable, which is easy cause fluctuations in the grid
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[0041] figure 1 It is the structure diagram of the main circuit of the bidirectional converter.
[0042] Such as figure 1 As shown, the main circuit of the bidirectional converter includes an energy storage battery 11, a DC side capacitor 12, an IGBT module 13, an equivalent internal resistance of a filter inductor 14, a filter inductor 15, and a grid 16, wherein V1~V6 are six IGBT modules.
[0043] figure 2 It is a structural block diagram of a specific embodiment of the bidirectional converter control device of the present invention.
[0044] In this implementation, if figure 2 As shown, the bidirectional converter control device includes a DC voltage PID controller 1, a DC current limiting module 2, a DC current PID controller 3, an AC current limiting module 4, an AC current inner loop module 5, and a DC voltage sensor DVT 6 , a DC current sensor DCT 7 , an AC voltage and current acquisition module 8 , and a coordinate system transformation module 9 .
[0045] The D...
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The invention discloses a bidirectional converter control device, which adopts a serial structure of a DC voltage outer loop, a DC current intermediate loop, and an AC current inner loop to realize unified control of rectification and inverter bidirectional conversion, wherein the DC voltage PID control The controller and the DC current limiting module form the DC voltage outer loop, the DC current PID controller and the AC current limiting module form the DC current intermediate loop, and the AC current inner loop module serves as the AC current inner loop of the control device. The bidirectional converter control device can realize the state adaptive switching function during the charging and discharging process according to the power dispatching command, namely the active power Pref for charging and discharging, and the charging and discharging capabilities of the energy storage battery itself, that is, the charging cut-off voltage and the discharging cut-off voltage. Realize unified control and smooth switching of rectification and inverter bidirectional converters, improve the stability and reliability of bidirectional converters, and reduce the difficulty of debugging bidirectional converters.
Description
technical field [0001] The invention belongs to the technical field of bidirectional converters, and more specifically relates to a control device for bidirectional converters. Background technique [0002] Due to energy shortage in the 21st century, it is imperative to vigorously develop green new energy. The development of new energy sources such as wind energy, solar energy, biomass energy, and ocean energy can effectively solve the problem of energy shortage. Therefore, distributed power generation systems based on these new energy sources have been developed rapidly. However, as the scale expands, the impact of distributed power generation on the grid is also increasing. The connection of various distributed power generation systems will cause harmonic pollution of the power grid, which will have a negative impact on the large power grid; secondly, the distributed power generation system is greatly affected by factors such as weather, seasons, and daylight, and the po...
Claims
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IPC IPC(8): H02J3/32H02M7/797
Inventor 李凯邹见效郑宏徐红兵徐伟烽
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA