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Low-voltage distribution network tail end low-voltage governance device parallel circulation suppression method

A low-voltage distribution network and circulating current suppression technology, which is applied in parallel operation of DC power supplies, output power conversion devices, electrical components, etc., can solve the problems of insufficient sampling accuracy and rising bus voltage of inverter voltage sources, etc. Improve the flow control accuracy, improve the control accuracy, and reduce the effect of current sharing error

Pending Publication Date: 2021-04-20
QINGDAO TOPSCOMM COMM
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Problems solved by technology

However, when the system is under light-load or no-load conditions, the current-sharing deviation caused by insufficient sampling accuracy will cause the bus voltage of the inverter voltage source in the parallel module to rise, triggering overvoltage protection

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  • Low-voltage distribution network tail end low-voltage governance device parallel circulation suppression method
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  • Low-voltage distribution network tail end low-voltage governance device parallel circulation suppression method

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Embodiment Construction

[0046] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0047] Such as figure 1As shown, a method for suppressing the circulation of low-voltage control devices at the end of the low-voltage distribution network in parallel. The overall system consists of three parts: AC-DC module, DC-DC module, and DC-AC parallel module. The invention mainly aims at suppressing the circulating current of the DC-AC parallel module under the light-load or no-load working condition.

[0048] Such as figure 2 As shown in Fig. 1, a method for suppressing parallel circulation of low-voltage treatment devices at the end of low-voltage distribution network, the control sche...

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Abstract

The invention discloses a low-voltage distribution network tail end low-voltage governance device parallel circulation suppression method, which comprises the steps of extracting output voltage and current fundamental components of a voltage source inverter by adopting an integrator SOGI to calculate active power and reactive power, and carrying out power current-sharing loop control. Meanwhile, an integrator SOGI is used for extracting bus voltage direct-current deviation and adding bus voltage current-sharing loop control, a power current-sharing loop and a bus voltage loop are configured with proper weight ratios, and the amplitude and the phase of the reference voltage of the inverter voltage source are optimized and adjusted at the same time, so that it is guaranteed that voltages output by all parallel modules are the same in amplitude and phase; circulation between modules in the parallel system is eliminated, the current sharing control precision is further improved, the problem that the current sharing precision and the system stability are affected by inaccurate power calculation caused by sampling precision limitation and harmonic component interference in the sampling precision limitation is effectively solved, and good engineering practicability is achieved.

Description

technical field [0001] The invention relates to the technical field of power electronics and its control, in particular to a method for suppressing parallel circulation of a low-voltage control device at the end of a low-voltage distribution network. Background technique [0002] In recent years, with the rapid development of power electronics technology and the continuous improvement of human living standards, many electrical equipment have increasingly higher requirements for the performance, capacity, and reliability of the power supply system. However, due to many reasons such as long power supply radius and small diameter of power supply lines in remote mountainous areas, the traditional centralized power supply mode characterized by large power grid and high voltage cannot meet the normal power demand at the end of the distribution network. An effective supplement to the centralized power supply has the advantages of flexible power supply, modularization, wide output p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02M1/32
Inventor 范建华徐鹏飞李健勋曹乾磊王亮赵新举张作超刘玉林张颖佳桂勇
Owner QINGDAO TOPSCOMM COMM
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