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Black-start system and method for wind and light power storage station

A black-start, wind-solar storage technology, applied in the field of black-start systems to achieve stable black-start effects

Inactive Publication Date: 2017-02-22
BEIJING SOARING ELECTRIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a black-start system and method for a wind-solar-storage power station, which can effectively overcome the inrush current, power balance, power quality, etc. question

Method used

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  • Black-start system and method for wind and light power storage station
  • Black-start system and method for wind and light power storage station
  • Black-start system and method for wind and light power storage station

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Embodiment 1

[0034] Such as figure 1 As shown, a black start system of a wind-solar storage power station in the present invention includes an energy storage power station, a controllable load, a corresponding step-up circuit, an AC transmission line and a supply-demand balance management system. The energy storage power station consists of an energy storage battery and a storage Energy converters, connected to AC transmission lines through booster lines, such as Figure 4 As shown, the energy storage power station is composed of one or more energy storage converters connected in parallel. When used as the black start power supply of the system, it is responsible for establishing the AC voltage and frequency of the transmission line; the step-up line includes a step-up transformer and line inductance, responsible for raising the low-voltage AC output from the energy storage converter to a voltage level that meets the requirements of the transmission line; the controllable load is used as a...

Embodiment 2

[0038] Such as figure 2 As shown, the present invention is a black-start method for a wind-solar-storage power station. When a power outage occurs in the grid and there is no adjacent grid that can supply power, the system starts the black-start scheme. In order to avoid the current impact caused by the excessive load at the beginning of the black start, the system will first carry out the preparation work before the black start. After the preparation work is completed, the energy storage power station is selected as the black start source. In order to avoid disturbance to the system due to the pre-magnetization of the step-up transformer in the step-up line, the black start source will start at zero voltage in the no-load state to establish the system AC bus Voltage. Since the system is weak at the beginning of the black start, any disturbance may cause the system voltage to become unstable again, so switching controllable loads (capable of voltage regulation and frequency ...

Embodiment 3

[0040] Such as image 3 As shown, the present invention is a black-start method for a wind-solar-storage power station. On the basis of Embodiment 2, when the power grid is operating normally, the supply-demand balance management system executes the grid-connected optimization control program to ensure the maximum At the same time, it takes into account the principle of economical and optimal power supply for users to realize the power dispatching of energy storage power stations. When a power outage or other unexpected failure occurs in the power grid, the system switches to the black start operation mode. For different power generation systems, the system will implement different control strategies. Adjust the controllable load to ensure the power adjustment margin of the energy storage converter as a black start source; predict the supply and demand of the source, load, and storage in real time, maximize the use of renewable energy such as wind power and photovoltaics, and...

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Abstract

The invention discloses a black-start system and method for a wind and light power storage station. The black-start system comprises an energy storage power station, a controllable load, corresponding boosting circuits, an alternating-current power transmission circuit and a supply and demand balance management system, the energy storage power station comprises an energy storage battery and one or a plurality of energy storage current transformers and is connected with the alternating-current power transmission circuit by the boosting circuits, a plurality of energy storage current transformers are parallelly connected to form the energy storage power station, and the energy storage power station establishes alternating-current voltage of the power transmission circuit and frequency when serving as a black-start power supply of the system; the boosting circuits comprise boosting transformers and circuit inductors, and low-voltage alternating current outputted by the energy storage current transformers is boosted to a voltage grade meeting the requirements of the power transmission circuit by the boosting circuits; the controllable load serves as a control unit for balancing power in the system, energy can bi-directionally flow, and the controllable load is an energy storage system dispatching the power; the supply and demand balance management system is a coordination control pivot of the whole wind and light power storage station in the black-start process and monitors states of power transmission lines, sources, loads, stored energy and power grids in real time.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a black-start system and method for a wind-solar-storage power station. Background technique [0002] The black start of the power system refers to the process of driving other units in the system to gradually resume system operation through the start-up of units with start-up capability in the system after the power system is completely shut down due to a fault, or through external power supply. The black start capability of power grid is of great significance to improve the safety and reliability of power system operation and reduce the economic loss and social impact caused by power system accidents. The traditional black start mainly relies on hydroelectric units or pumped storage units. However, with the large-scale application of renewable energy, the proportion of photovoltaic, wind power, and energy storage in the power system is increasing. The black start method based on w...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/28H02J3/14
CPCH02J3/001H02J3/003H02J3/14H02J3/28H02J3/382Y02B70/3225Y02E70/30Y04S20/222
Inventor 王仕城伍春生龙欢
Owner BEIJING SOARING ELECTRIC TECH CO LTD
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