Non-communication bus voltage zero-deviation control method

A bus voltage and control method technology, which is applied in the field of non-communication bus voltage non-deviation control, can solve the problems of reducing system reliability, economy, scalability, and increasing communication pressure, so as to improve reliability, facilitate expansion, Realize the effect of plug and play

Active Publication Date: 2019-12-20
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
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Problems solved by technology

[0005] In a DC microgrid, traditional droop control cannot well deal with the inherent contradiction between accurate current distribution and bus voltage stability
Adding communication in traditional droop control, such as high-speed communication, low-speed communication, adjacent communication, etc., can better deal with the inherent contradictions in traditional droop control, but increases communication pressure and reduces system reliability, economy, and scalability sex

Method used

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  • Non-communication bus voltage zero-deviation control method
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Embodiment Construction

[0024] The typical system architecture of DC microgrid is as follows: figure 1 As shown, it mainly includes four aspects: network, source, load, and storage, which correspond to traditional large power grid, distributed power supply, load, and energy storage system respectively. Aiming at the situation of an independent DC microgrid, the present invention analyzes in detail the influence of the line resistance on the current distribution of the DC microgrid when the scale of the DC microgrid becomes larger and the line resistance value cannot be ignored, and improves the traditional droop control by introducing The voltage recovery unit maintains the stability of the bus voltage, which will be discussed in detail below.

[0025] like figure 2 The simplified circuit model diagram of the DC microgrid shown, u ref1 is the voltage given value of distributed power converter 1; u ref2 is the voltage given value of distributed power converter 2; u dc1 is the output voltage of co...

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Abstract

The invention relates to a non-communication bus voltage zero-deviation control method. Bus voltage stability and accurate load current allocation are used as control targets, accurate line impedanceinformation is acquired by an active measurement method and is introduced to a droop coefficient so as to make up influence of line impedance inconsistency on current allocation, and a load current can be accurately allocated during the steady-state and dynamic process. Moreover, virtual bus voltage information is introduced, a bus voltage stably runs at a rated value according to a translation compensation principle, and current allocation is not affected. With the control method proposed by the invention, the defect of traditional droop control is overcome, interconnection communication is not needed, the plug and play requirement is met, the capacity expansion of the system is facilitated, and the system reliability is greatly improved.

Description

technical field [0001] The invention relates to a micro-grid control technology, in particular to a non-communication bus voltage non-deviation control method. Background technique [0002] Microgrid is a small power generation and distribution system that integrates distributed generation (Distributed Generation, DG), energy storage system (Energy Storage System, ESS) and multiple types of loads, and uses power electronic converters for energy control and distribution. Grid-connected and independent autonomous two operating modes. Compared with the traditional AC microgrid, the DC microgrid does not have problems such as reactive power, frequency, and phase synchronization, and the reliability and controllability of the system are greatly improved. In addition, there are fewer energy conversion links, high efficiency, low cost, and more conducive to the access of distributed power sources and DC loads. Therefore, the research and development of DC microgrids have received...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10
CPCH02J1/10
Inventor 赵晋斌蒋伟明高明明毛玲屈克庆
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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