Power supply system

A power supply system and power supply technology, applied in the direction of emergency power supply arrangements, photovoltaic power generation, electrical components, etc., can solve problems such as voltage or frequency maintenance, and achieve the effect of preventing generators from falling off

Pending Publication Date: 2021-03-09
NISSIN ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, as the number of distributed power sources interconnected with the commercial power system increases, if these distributed power sources are disconnected at the time of a sudden drop, it may have a significant impact on the maintenance of the voltage or frequency of the entire commercial power system

Method used

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Embodiment Construction

[0046] Hereinafter, one embodiment of the power supply system of the present invention will be described with reference to the drawings.

[0047] Such as figure 1 As shown, the power supply system 100 of this embodiment functions as an uninterruptible power supply system (uninterruptible power supply function) and a function (load leveling function) as a distributed power supply system. Between the power system 10 and the important load 30, when the commercial power system 10 is abnormal, the power supply system that supplies power to the important load 30. Levelized power system.

[0048] Here, the commercial power system 10 is a power supply network of a power company (power provider), and has a power generation station, a power transmission system, and a power distribution system. In addition, the important load 20 is a load that should supply power stably even when there is a system abnormality such as a power outage or a sudden drop. figure 1 There is one, but it can a...

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Abstract

The present invention, which satisfies FRT requirements and reliably supplies power to a load even when there is a system abnormality, is provided with: a distributed power supply 2 connected to a power line L1 for feeding power from a commercial power system 10 to an important load 30; an opening / closing switch 3 that is on the power line L1 and provided closer to the commercial power system thanthe distributed power supply 2; an impedance element 4 connected in parallel to the opening / closing switch 3; a system abnormality detection unit 5 that detects abnormalities in the commercial powersystem 10; and a switch control unit 6 that opens the opening / closing switch 3 and connects the distributed power supply 2 and the commercial power system 10 via the impedance element 4 when an abnormality in the commercial power system 10 is detected. While the distributed power supply 2 and the commercial power system 10 are connected via the impedance element 4, the distributed power supply 2 continues an operation including reverse power flow. The distributed power supply 2 has a rotary power generation device 23 and an energy storage device 22. The energy storage device 22 has: an energystorage unit 221; a bi-directional power convertor 222 that charges / discharges the energy storage unit 221; and a convertor control unit 223 which controls the bi-directional power convertor 222 and performs an operation simulating the inertia of the rotary power generation device 23.

Description

technical field [0001] The invention relates to a power supply system. Background technique [0002] In recent years, along with improvements in battery performance, especially in battery systems with large capacity (500 kW or more), it is being considered to realize both the uninterruptible power supply function and the load leveling function at the same time. For example, as disclosed in Patent Document 1, there is considered a secondary battery system that realizes both the uninterruptible power supply function and the load leveling function. The system is configured to supply power to important loads by de-loading in response to a power outage or dip. [0003] However, as the number of distributed power sources interconnected with the commercial power system increases, if these distributed power sources are disconnected at the time of a sudden drop, it may have a significant impact on the maintenance of the voltage or frequency of the entire commercial power system. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32H02J3/46
CPCH02J3/32H02J9/066H02J9/062H02J7/35H02J3/0012H02J2300/22H02J3/381H02J3/46
Inventor 柏原弘典
Owner NISSIN ELECTRIC CO LTD
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