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High-capacity off-grid micro-grid hybrid frequency modulation method

A micro-grid and large-capacity technology, applied in the field of micro-grid, can solve the problems of unreasonable judgment of discharge time, frequent start-up of secondary adjustment equipment, unfavorable system economy, etc., and achieve the effect of improving economic benefits

Inactive Publication Date: 2018-09-28
NR ELECTRIC CO LTD +1
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  • Abstract
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  • Claims
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Problems solved by technology

It is unreasonable to use the method of judging the discharge time in this invention, because the discharge time cannot represent the discharge power, which may cause the secondary adjustment equipment to start frequently, which is not conducive to improving the economy of the system

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Embodiment Construction

[0042] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0043]The invention discloses a large-capacity off-grid micro-grid hybrid frequency modulation method. The energy storage power supply is configured into two parts: a voltage frequency type VF energy storage power supply and a power type PQ energy storage power supply; a coordination controller collects the system frequency and communicates with the storage Energy and power supply communication, judge the system frequency in which interval, and give control strategies according to different intervals; and transfer the energy storage power output through the PQ energy storage power supply; when the system load fluctuates, the frequency is adjusted by the VF energy storage power supply, and the PQ energy storage power supply operates economically; When the system load fluctuates greatly, the PQ energy storage power supply will provide emergenc...

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Abstract

The invention discloses a high-capacity off-grid micro-grid hybrid frequency modulation method which comprises the steps of: configuring energy storage into two parts of voltage frequency type (VF) energy storage and power type (PQ) energy storage; coordinating a controller to acquire a system frequency, and communicating with energy storage by a rapid bus; determining which interval the system frequency is positioned in, and according to different intervals, giving out control strategies; and by a PQ energy storage power supply, transferring an energy storage power supply output. The controlmethod disclosed by the invention can reasonably allocate the energy storage output; the PQ energy storage power supply can be used for generating economic benefits in a normal case, and can be used for keeping stability of a system when a VF energy storage power supply approaches to a full-power operating case; a working environment of the VF energy storage power supply can be optimized, and working stoppage of the VF power supply, which is caused by electric quantity abnormality, is prevented; and in a case of keeping economic benefits of the off-grid micro-grid system, stability of the system is improved, and the high-capacity off-grid micro-grid hybrid frequency modulation method is suitable for actual engineering application.

Description

technical field [0001] The invention belongs to the technical field of micro-grids, and in particular relates to a hybrid frequency regulation method for large-capacity off-grid micro-grids. Background technique [0002] Large-capacity off-grid microgrids are often equipped with large-capacity energy storage, and multiple energy storage converters PCS need to be configured, so there are cases where multiple PCS operate in parallel. If all PCS adopt the VF operation mode, it will be more difficult to set the control parameters, and it will be easier to cause weak damping, which will cause multi-machine system oscillation, so there are hidden dangers to the stable operation of the system. At the same time, the control goal of the off-grid microgrid is to improve the economy under the premise of ensuring system stability, and VF energy storage cannot produce direct economic benefits. Therefore, large-capacity off-grid microgrids are often equipped with a part of energy PQ mode...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/28
CPCH02J3/24H02J3/28
Inventor 徐光福陈俊朱皓斌侯炜王万纯魏阳王晨
Owner NR ELECTRIC CO LTD
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