A large-capacity centralized virtual synchronous machine control method, device and system

A technology of a virtual synchronous machine and a control method, which is applied to circuit devices, AC network load balancing, and AC network circuits, etc., and can solve problems such as difficult SOC balance control of large-capacity energy storage batteries, so as to avoid excessive parallel capacity and enhance stability performance, the effect of large system power

Active Publication Date: 2019-11-05
XUJI GRP +5
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a large-capacity centralized virtual synchronous machine control method, device and system, which are used to solve the problem of difficult SOC balance control of large-capacity energy storage batteries

Method used

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  • A large-capacity centralized virtual synchronous machine control method, device and system
  • A large-capacity centralized virtual synchronous machine control method, device and system
  • A large-capacity centralized virtual synchronous machine control method, device and system

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Embodiment Construction

[0041] A large-capacity centralized virtual synchronous machine control system, including n sets of energy storage battery packs, n-way DC / DC circuits, n-way DC / AC circuits, each energy storage battery pack is connected to the corresponding DC / DC circuit and DC / AC circuit, the DC side of the DC / AC circuit is connected in parallel to the DC bus, the AC side of the DC / AC circuit is connected in parallel to the transformer, and the AC side of the DC / AC circuit is connected with n filter circuits.

[0042] Specifically, such as figure 1 As shown, a two-stage topology is adopted, the system capacity is 5MW, and the front stage uses 10 DC / DC circuits to connect with matching batteries. Limited by the battery capacity, the power of a single DC / DC is 500kW, which can avoid the need for a single energy storage battery The parallel capacity of the system is too large, and the output side of the circuit is directly connected in parallel; the rear stage adopts 4-way 1.25MW DC / AC circuit,...

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Abstract

The invention discloses a control method, apparatus and system for a high-capacity integrated type virtual synchronous machine. The control system for the high-capacity integrated type virtual synchronous machine comprises n groups of energy storage battery backs, n paths of DC / DC circuits, and n paths of DC / AC circuits, wherein each energy storage battery pack is connected with the corresponding DC / DC circuits and DC / AC circuits in sequence; the direct current sides of the DC / AC circuits are connected with a direct current bus in parallel; the alternating current sides of the DC / AC circuits are connected with a transformer in parallel; and the alternating current sides of the DC / AC circuits are connected with n paths of filtering loops. By virtue of the process, the problem of relatively high difficulty in SOC balance control of the high-capacity energy battery is solved.

Description

technical field [0001] The invention belongs to the field of electrical engineering, and in particular relates to a large-capacity centralized virtual synchronous machine control method, device and system. Background technique [0002] At present, my country's installed capacity of wind power and photovoltaic power generation ranks first in the world and maintains rapid development. However, compared with traditional synchronous generators such as thermal power, wind power generation and photovoltaic power generation have problems such as power intermittent and random fluctuations, and do not have the ability to damp power oscillations, inertial frequency modulation, and autonomous voltage regulation. After the grid, it will affect the voltage / frequency stability of the grid. [0003] In response to this problem, it is possible to stabilize fluctuating power by adding large-capacity centralized energy storage to wind power and photovoltaic stations. Limited by energy stora...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/32
CPCH02J3/32H02J2203/20
Inventor 黄辉张海龙王林肖飞曹建博凤勇龚培娇马贝龙陈天锦曹智慧李相俊崔林张迎星周建华
Owner XUJI GRP
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