Multi-port back-to-back type suture-ring-free power conversion device and method

Abstract

The invention provides a multi-port back-to-back suture-ring-free power conversion device and method, and belongs to the field of low-voltage power distribution network closed-loop power conversion, and the device is specifically characterized in that a series voltage compensator is connected with a parallel converter through a DC coupling capacitor; the two ends of the compensation side of the series voltage compensator are connected with a loop closing switch and a multi-port circuit breaker respectively; the other side of the loop closing switch is connected with the other multi-port circuit breaker; the number of ports of the multi-port circuit breaker is equal to that of the power supplies; the parallel voltage converter is used for maintaining the voltage of the common direct-current bus to be constant and performing harmonic compensation on load current; the alternating current side is connected to a load through an electricity-taking circuit breaker to take electricity; the series voltage compensator is used for providing compensation voltage and adjusting the amplitude and phase of the voltage at the output end of the loop closing switch; and the multi-port circuit breaker provides a plurality of transfer power supply lines for each power supply area. According to the invention, the cost is greatly reduced, the closed-loop power conversion device is simplified, the closed-loop impact current can be eliminated, and the power supply reliability is improved.

Description

technical field [0001] The invention belongs to the field of low-voltage distribution network closed loop power transfer, and more specifically relates to a multi-port back-to-back seamless loop power transfer device and method. Background technique [0002] With the continuous development of society and the improvement of people's living standards in recent years, users have increasingly strict requirements for power quality. Power supply reliability has always been an important indicator of power quality. In order to ensure high-quality power resources, each power supply unit must strictly control the number and duration of power outages. However, the daily maintenance of the power grid and the construction of the expansion of the distribution network will cause intermittent power supply. As the most common and effective means, the distribution network closure and transfer play an important role in improving the reliability of power supply. [0003] The low-voltage distri...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the object of the present invention is to provide a multi-port back-to-back seamless loop power transfer device and method, aiming at solving the problem that the existing loop-closed power transfer device can only supply power for the two connected power sources. The lines between areas realize the loop-closing and power-transfer operation, so a large number of loop-closing and power-transfer devices need to be equipped, resulting in problems of high cost, cumbersome control steps and complicated wiring

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