CN210693469U - Hybrid energy storage and control system for assisting power plant frequency modulation - Google Patents

Hybrid energy storage and control system for assisting power plant frequency modulation Download PDF

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Publication number
CN210693469U
CN210693469U CN201922171562.3U CN201922171562U CN210693469U CN 210693469 U CN210693469 U CN 210693469U CN 201922171562 U CN201922171562 U CN 201922171562U CN 210693469 U CN210693469 U CN 210693469U
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energy storage
power plant
battery
storage system
flywheel
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宗银路
崔双双
任静
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Dunshi Magnetic Energy Technology Co ltd
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Dunshi Magnetic Energy Technology Co ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10Flexible AC transmission systems [FACTS]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70Smart grids as climate change mitigation technology in the energy generation sector
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16Mechanical energy storage, e.g. flywheels or pressurised fluids
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/14Energy storage units

Abstract

The utility model relates to a supplementary power plant's frequency modulation's hybrid energy storage and control system thereof, including battery energy storage system, flywheel energy storage system, battery energy storage system's output and flywheel energy storage system's output be connected to the output of power plant through step up transformer after respectively through battery MW PCS, flywheel MW PCS and concatenate together, power plant's output rethread main transformer is connected with the electric wire netting. The flywheel of the system, a hybrid energy storage system of the battery and a unit jointly complete a frequency modulation task, and the action times of the battery are reduced to the maximum extent under the scheduling of the most optimized control logic, so that the service life of the battery is prolonged, and the potential safety hazard of the battery is reduced.

Description

Hybrid energy storage and control system for assisting power plant frequency modulation
Technical Field
The utility model relates to an electric power energy storage technique is exactly a mixed energy storage and control system of supplementary power plant's frequency modulation.
Background
With increasing importance on environmental protection of all countries in the world, energy conservation and emission reduction are advocated, new energy sources such as wind power and photovoltaic are favored globally, and all countries have a measure for encouraging development of new energy sources, so that development of new energy sources such as wind power and photovoltaic is promoted. According to statistics, in 2016 compared with 1997, the global wind power installation is increased from 7.64GW to 468.99GW, the global photovoltaic installation is increased from 0.23GW to 301.47GW, and the increase is 60 times and 1284 times respectively, and therefore new energy resources become power sources which are not negligible in power supply. Meanwhile, the new energy is connected to the main network, so that the power grid is influenced more and more, wherein the most obvious influence is that the frequency modulation difficulty is increased.
For the frequency modulation work of power plants, the industry is always researching more ideal coping strategies. In the design of a frequency modulation system, energy storage equipment is mostly added, and after a frequency modulation instruction is received, energy of the energy storage equipment is put into a power grid according to the instruction requirement so as to achieve the purpose of frequency modulation. In recent years, with the rise of energy storage power stations, the phenomenon that the energy storage power stations participate in frequency modulation is increased day by day, but ignition events of the energy storage power stations occur at home and abroad for many times, which is related to the fact that energy storage units completely adopt chemical batteries. Because a larger part of the frequency fluctuation has the characteristics of short time and high frequency, the energy storage battery needs to be charged and discharged frequently during the frequency modulation operation, and the condition can not only reduce the service life of the battery, but also lead the battery to continuously heat, thereby forming potential safety hazards.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a supplementary power plant's frequency modulation's hybrid energy storage and control system thereof, the frequency modulation task is accomplished jointly to the hybrid energy storage system and the unit of this system flywheel and battery to under the dispatch of control logic that optimizes most, the maximize reduces the action number of times of battery, and then prolongs battery life and reduces the potential safety hazard of battery.
In order to solve the above technical problem, the utility model discloses a following technical means:
the utility model provides a mixed energy storage system of supplementary power plant's frequency modulation, includes battery energy storage system, flywheel energy storage system, battery energy storage system's output and flywheel energy storage system's output be connected to the output of power plant through step up transformer after respectively through battery MW PCS, flywheel MW PCS parallelly connected together, the output rethread main transformer of power plant is connected with the electric wire netting.
The utility model discloses in introducing the energy storage unit with the flywheel that has short-term, high frequency, quick charge-discharge characteristic, the flywheel energy storage has following characteristics:
(1) the response speed is high, full power output can be realized within the time range of millisecond grade, and the response capability completely meets the requirement of frequency modulation response precision index;
(2) the control is accurate, and stable output can be kept at any power point;
(3) bidirectional regulation capability, the charging process appears as a load and the discharging process appears as a power supply. According to the performance characteristics, if the flywheel is used for storing energy, the superposition of a frequency modulation tracking curve and a command curve can be almost realized, namely, the phenomena of reverse regulation, deviation, delay and the like can not occur.
The hybrid energy storage system of the flywheel and the battery and the unit together complete the frequency modulation task, and the action times of the battery are reduced to the maximum extent under the scheduling of the most optimized control logic, so that the service life of the battery is prolonged, and the potential safety hazard of the battery is reduced. In the capacity matching of the flywheel and the battery, the most economical capacity ratio of the flywheel and the battery is determined in advance according to the historical frequency modulation working condition of a project power plant.
The further preferred technical scheme is as follows:
the auxiliary power plant frequency modulation's hybrid energy storage system's control system, the power plant be equipped with power plant control system DCS, battery energy storage system is equipped with battery energy storage control system, flywheel energy storage system is equipped with flywheel energy storage control system, power plant control system DCS is connected with power plant control AGC electricity, battery energy storage control system, flywheel energy storage control system is connected with energy storage system control AGC electricity, power plant control AGC, energy storage system control AGC is connected with power plant remote terminal device electricity respectively, power plant remote terminal device is connected with net side AGC electricity.
The power grid dispatching monitors data such as voltage, current and frequency of the power grid in real time through the network side AGC, the network side AGC processes collected data, the output size of a power plant and a hybrid energy storage unit is determined, then an instruction is issued to the power plant remote terminal device, the power plant remote terminal device issues the network side AGC instruction to the power plant control AGC and the energy storage system control AGC, the energy storage system control AGC determines the output size of the hybrid energy storage system, according to the calculated power requirement, the battery energy storage system and the flywheel energy storage system are respectively adjusted through the battery energy storage control system and the flywheel energy storage control system to output power, and the power requirement of the power grid is met.
Drawings
Fig. 1 is a schematic diagram of a frame structure of a hybrid energy storage system of the present invention;
fig. 2 is a schematic structural diagram of a control system framework of the hybrid energy storage system of the present invention;
FIG. 3 is a waveform diagram of the flywheel and battery frequency response of the present invention;
FIG. 4 is a schematic diagram of a primary system of the hybrid energy storage system of the present invention accessing a power plant;
description of reference numerals: 1-power plant; 2-a main transformer; 3-a power grid; 4-a step-up transformer; 5-energy storage control switch; 6-cell MW PCS; 7-a battery energy storage system; 8-flywheel energy storage system; 9-flywheel MW PCS.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
Referring to fig. 1 and fig. 2, the hybrid energy storage system for assisting in frequency modulation of a power plant according to the embodiment is composed of a battery energy storage system 7 and a flywheel energy storage system 8; the output end of the battery energy storage system 7 and the output end of the flywheel energy storage system 8 are respectively connected in parallel through a battery MW PCS6 and a flywheel MW PCS9 and then are connected to the output end of the power plant 1 through an energy storage control switch 5 and a step-up transformer 4 in sequence, and the output end of the power plant 1 is connected with the power grid 3 through a main transformer 2.
Control system of the mixed energy storage system of supplementary power plant's frequency modulation, power plant 1 be equipped with power plant's control system DCS, battery energy storage system 7 is equipped with battery energy storage control system, flywheel energy storage system 8 is equipped with flywheel energy storage control system, power plant's control system DCS is connected with power plant's control AGC electricity, battery energy storage control system, flywheel energy storage control system is connected with energy storage system control AGC electricity, power plant's control AGC, energy storage system control AGC is connected with power plant's remote terminal device electricity respectively, power plant's remote terminal device is connected with net side AGC electricity.
In the embodiment, the flywheel with the characteristics of short time, high frequency and quick charge and discharge is introduced into the energy storage unit, the hybrid energy storage system of the flywheel and the battery and the unit together complete the frequency modulation task, the action times of the battery are maximally reduced under the scheduling of the most optimized control logic, the service life of the battery is prolonged, and the potential safety hazard of the battery is reduced (the frequency response waveform conditions of the flywheel and the battery are approximately as shown in figure 3).
The power grid 3 schedules and monitors data such as voltage, current and frequency of the power grid 3 in real time through the grid-side AGC, the grid-side AGC processes acquired data, the output sizes of the power plant 1 and the hybrid energy storage unit are determined, then the instruction is issued to the power plant remote terminal device, the power plant remote terminal device issues the grid-side AGC instruction to the power plant control AGC and the energy storage system control AGC, the energy storage system control AGC determines the output size of the hybrid energy storage system, according to the calculated power requirement, the battery energy storage system 7 and the flywheel energy storage system 8 are respectively adjusted through the battery energy storage control system and the flywheel energy storage control system to output power, and the power requirement of the power grid 3 is met.
The implementation approach of the hybrid energy storage system accessing the primary system of the power plant (as shown in fig. 4): the whole system can be composed of a high-low voltage cabinet container, a PCS container, a flywheel energy storage container and a battery energy storage container. The high-low voltage container comprises a high-voltage cabinet (a vacuum circuit breaker, a voltage transformer, a current transformer, a lightning arrester, a charged indicator and a grounding switch), a step-down transformer and a low-voltage outlet circuit breaker cabinet. The PCS container consists of a double-split transformer and a PCS cabinet, the flywheel container consists of a DC/AC bidirectional converter and a magnetic suspension flywheel, and the battery energy storage container consists of a DC/DC converter and a battery pack.
The flywheel energy storage system and the battery energy storage system are respectively output through the PCS and connected in parallel, and can be directly connected in parallel to a low-voltage 400VAC power grid to perform frequency modulation work. And the voltage boosting transformer and the high-voltage cabinet can be connected in parallel with different high-voltage bus sections or high-voltage plant transformers of the power plant. The two high-voltage access modes are compared as follows:
the first method is as follows: the hybrid energy storage system is directly connected to a closed bus system of a power plant, namely a closed bus between a generator and a main transformer through a voltage-boosting transformer, in such a way, the independent transformer is directly connected to the bus, and the safety problem of the main transformer cannot be caused by harmonic waves possibly generated by power electronic elements in the energy storage system;
the second method comprises the following steps: the two-stage boosting is adopted to be accessed through the high-rise substation, namely, the hybrid energy storage system is accessed to the service bus, so that the mode is higher in safety and is more suitable for the high-rise substation with large capacity variation or utilizing a standby high-rise substation. After the hybrid energy storage system is connected, the high-voltage side peak load rate and the low-voltage side peak load rate of the high-voltage side of the high-voltage plant both meet the long-term operation requirement.
The above description is only a preferred and practical embodiment of the present invention, and not intended to limit the scope of the present invention, and all structural equivalents made by using the contents of the specification and drawings are included in the scope of the present invention.

Claims (2)

1. The utility model provides a hybrid energy storage system of supplementary power plant's frequency modulation, includes battery energy storage system, flywheel energy storage system, its characterized in that: the output end of the battery energy storage system and the output end of the flywheel energy storage system are connected in parallel through a battery MW PCS and a flywheel MWPCS respectively and then are connected to the output end of the power plant through a step-up transformer, and the output end of the power plant is connected with a power grid through a main transformer.
2. The control system of a hybrid energy storage system for assisting plant frequency modulation according to claim 1, wherein: the power plant be equipped with power plant's control system DCS, battery energy storage system is equipped with battery energy storage control system, flywheel energy storage system is equipped with flywheel energy storage control system, power plant's control system DCS is connected with power plant's control AGC electricity, battery energy storage control system, flywheel energy storage control system are connected with energy storage system control AGC electricity, power plant's control AGC, energy storage system control AGC are connected with power plant's remote terminal device electricity respectively, power plant's remote terminal device is connected with net side AGC electricity.
CN201922171562.3U 2019-12-06 2019-12-06 Hybrid energy storage and control system for assisting power plant frequency modulation Active CN210693469U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922171562.3U CN210693469U (en) 2019-12-06 2019-12-06 Hybrid energy storage and control system for assisting power plant frequency modulation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922171562.3U CN210693469U (en) 2019-12-06 2019-12-06 Hybrid energy storage and control system for assisting power plant frequency modulation

Publications (1)

Publication Number Publication Date
CN210693469U true CN210693469U (en) 2020-06-05

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Country Status (1)

Country Link
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