Low-voltage ride through control system and method for dual-active full-bridge direct-current converter
A DC converter and low-voltage ride-through technology, which is applied in parallel operation of DC power supplies, DC network circuit devices, electrical components, etc., can solve problems such as the inability to suppress the inrush current of dual active bridge converters
Pending Publication Date: 2020-05-08
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology
[0005] This application provides a dual active full bridge DC converter low voltage ride through control system and method to solve the technical problem that the inrush current generated by the low voltage fault of the dual active bridge converter cannot be suppressed
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[0032] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.
[0033] A DC microgrid is generally composed of DC converters, distributed power sources, energy storage units and DC loads. Among them, the energy storage unit and the photovoltaic unit are connected to the bus bar of the DC micro-grid through the DC converter. By adopting a suitable control strategy for the DC converter, the coordinated cont...
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The invention discloses a low-voltage ride-through control system and method for a dual-active full-bridge DC converter, and the system comprises a fault detection unit which is electrically connectedwith a mode switching unit and is used for detecting the state information of a power grid, and transmitting the state information of the power grid to the mode switching unit; a mode switching unitswitches the connection mode according to the power grid state, and when the power grid state information is normal, the mode switching unit is connected with the voltage stability control unit; whenthe power grid state information is a fault, the mode switching unit is connected with the current hysteresis control unit; the mode switching unit is further electrically connected with a PWM drivingunit, and the PWM driving unit is used for generating driving signals of all switching tubes in the dual-active-bridge converter. According to the invention, the low-voltage fault ride-through of theconverter can be realized under the condition of ensuring that the dual-active-bridge converter is not off-grid, the direct-current equipment is protected, and the safe and stable operation of the direct-current microgrid is effectively maintained.
Description
technical field [0001] The present application relates to the technical field of DC converters, in particular to a low-voltage ride-through control system and method for a dual-active full-bridge DC converter. Background technique [0002] Power grid faults and other large disturbances are unavoidable real problems of the power grid. As an important voltage and power flow control device for DC microgrids, DC converters' operating performance under large disturbances such as faults will directly determine the power supply reliability of DC microgrids. [0003] When the DC microgrid fails, for example, when the DC bus voltage drops sharply, unlike the AC current, since the current of the DC microgrid does not cross zero, the fault current in the DC microgrid system will increase extremely quickly, which will affect the microgrid. The converters in the system will cause great damage, and also affect the security and stability of the microgrid system. [0004] At present, the r...
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IPC IPC(8): H02J1/10H02M1/32
CPCH02J1/102H02M1/32H02M1/325
Inventor 栾思平涂春鸣苏适唐立军杨家全
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST