WO2021251512A1 - Hybrid charge/discharge system - Google Patents

Hybrid charge/discharge system Download PDF

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Publication number
WO2021251512A1
WO2021251512A1 PCT/KR2020/007443 KR2020007443W WO2021251512A1 WO 2021251512 A1 WO2021251512 A1 WO 2021251512A1 KR 2020007443 W KR2020007443 W KR 2020007443W WO 2021251512 A1 WO2021251512 A1 WO 2021251512A1
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WO
WIPO (PCT)
Prior art keywords
charge
discharge
battery
battery part
grid power
Prior art date
Application number
PCT/KR2020/007443
Other languages
French (fr)
Inventor
Hoe Jin KOO
Yu Tack Kim
Eo Hyun Yoo
Dong Min Cha
Soo Ahn JUNG
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Battery R&D Association Of Korea
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Application filed by Battery R&D Association Of Korea filed Critical Battery R&D Association Of Korea
Priority to PCT/KR2020/007443 priority Critical patent/WO2021251512A1/en
Publication of WO2021251512A1 publication Critical patent/WO2021251512A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Definitions

  • the present invention relates to a hybrid charge/discharge system, which relates to a hybrid charge/discharge system capable of selective operation in high power or high energy in frequency regulation operation of grid power systems, improving economic efficiency, and maximizing life.
  • a power generation part for transmission and distribution including a generator and a substation
  • a plurality of loads are electrically connected.
  • a function of maintaining power quality such as frequency stabilization of the transmission and distribution power by the grid power system is required, and when the demand for the transmission and distribution power has exceeded the supply, the frequency is lowered, and conversely, when the supply has exceeded the demand, the frequency is increased.
  • the frequency when the frequency has been lowered, the generation power is increased, and when the frequency is increased, the generation power is decreased, thereby stably operating the frequency of the grid power system.
  • a charge/discharge system which can be charged from the grid power system and discharged to the grid power system, is used for frequency control.
  • the charge/discharge system is provided such that the discharge to the grid power system is performed when the frequency of the grid power system has been lowered, and that the charge from the grid power system is performed when the frequency of the grid power system has been increased.
  • a hybrid charge/discharge system which comprises a first battery part that can be charged from a grid power system, is provided to be capable of being discharged to each of the grid power system and loads connected to the grid power system, and has a first charge/discharge rate (C-rate), a second battery part that is connected in parallel to the first battery part in the grid power system, can be charged from the grid power system, is provided to be capable of being discharged to each of the grid power system and loads connected to the grid power system, and has a second charge/discharge rate lower than the first charge/discharge rate (C-rate), and a control part provided so as to control each of charge and discharge of the first battery part and the second batter part depending on the degree of frequency variation, for sensing the frequency variation of the grid power system and suppressing the frequency variation.
  • C-rate charge/discharge rate
  • the hybrid charge/discharge system related to at least one example of the present invention has the following effects.
  • the first operation mode may correspond to the frequency regulation operation in a high power battery or capacity with excellent power performance
  • the second operation mode may correspond to the battery with excellent energy performance
  • the effective operation mode of the battery for adjusting the frequency is designed by a method of being responded in the first battery part (primary) with high power for up to 15 minutes according to the first operation mode through the initial detection and then additionally responded in the second battery part (secondary), whereby the price of the charge/discharge system can be reduced and the life can be extended.
  • the life of the battery of the charge/discharge system for adjusting the frequency which is usually operated for about 4 years or so, can be extended up to 10 years, and the efficiency of system configuration and operation can be increased by being classified into high power (primary) and high energy (secondary) through the characteristics required for the battery system for adjusting the frequency.
  • Figures 1 and 2 are schematic diagrams showing a hybrid charge/discharge system related to one example of the present invention.
  • Figure 5 is a graph showing power density-energy density according to the type of battery.
  • FIGS 1 and 2 are schematic diagrams showing a hybrid charge/discharge system (hereinafter, abbreviated as 'charge/discharge system') related to one example of the present invention
  • Figure 3 is a table showing the energy density (specific energy), C-rate and cycle life according to the type of battery.
  • Figure 4 is a graph showing energy-power according to the type of battery
  • Figure 5 is a graph showing power density-energy density according to the type of battery.
  • the charge/discharge system (100, 200) related to one example of the present invention is electrically connected to a grid power system (101, 201).
  • the grid power system (101) comprises one or more power generation parts (150, 250).
  • the power generation part (150, 250) may comprise the remaining power generation part (for example, thermal power generation, etc.) except for a new renewable power generation part (140, 240) using a new renewable energy source (wind power, solar power, etc.), which is described below.
  • the power generation part (150, 250) comprises a power plant and a substation, one or more of which may be provided in the grid power system.
  • one or more loads that accommodate the power produced by the power generation part may be connected to the grid power system (101, 201).
  • the charge/discharge system (100, 200) comprises a first battery part (110, 210), a second battery part (210, 220), and a control part (102, 202).
  • the control part (102, 202) may also be provided to control only the charge/discharge system (100, 200), and may also be provided to control the charge/discharge system (100, 200) and the grid power system (101, 201) together.
  • the control part (102, 202) may be provided to sense the supply and demand of the grid power system, to sense the frequency variation of the grid power system, and to sense SOC values of the respective battery parts.
  • the charge/discharge system (100, 200) comprises a first battery part (110, 120) which can be charged from a grid power system, is provided to be capable of being discharged to each of the grid power system and the loads connected to the grid power system and has a first charge/discharge rate (C-rate).
  • the first battery part (110, 120) may comprise one or more batteries and a bi-directional AC-DC converter.
  • the charge/discharge system (100, 200) comprises a second battery part (120, 220) connected in parallel to the first battery part (110, 120) in the grid power system.
  • the second battery part (120, 220) can be charged from the grid power system, and is provided to be capable of being discharged to each of the grid power system and loads connected to the grid power system.
  • the second battery part (120, 220) has a second charge/discharge rate lower than the first charge/discharge rate (C-rate).
  • the second battery part (120, 220) may comprise one or more batteries and a bi-directional AC-DC converter.
  • the charge/discharge system (100, 200) may comprise heterogeneous battery parts with different powers.
  • the charge/discharge system (100, 200) comprises a control part (102, 202) provided so as to control each of charge and discharge of the first battery part and the second batter part depending on the degree of frequency variation, for sensing the frequency variation of the grid power system (101, 201) and suppressing the frequency variation.
  • frequency regulation operation or frequency regulation mode
  • the charge/discharge system (200) related to the second example of the present invention may comprise a PCS part (230) electrically connected to the first and second battery parts (210, 220).
  • the first and second examples differ only whether or not the switch part and the PCS part are added, and are the same for the charge/discharge control upon frequency variation of the grid power system, whereby they are to be explained together below.
  • the first charge/discharge rate may be 2 to 9 times the second charge/discharge rate.
  • the ratio of the first charge/discharge rate to the second charge/discharge rate may be 2 to 9:1 (2:1 to 9:1).
  • the control part (102, 202) may perform charge or discharge through the first battery part (110, 210) for the frequency regulation operation.
  • the frequency variation width is 5% or more of the reference frequency (predetermined value), that is, when it is 63Hz or more, or 57HZ or less in the case where the reference frequency is 60Hz
  • the charge or the discharge may be performed through the first battery part (110, 210) with high power.
  • the first battery part (110, 210) is provided to be capable of being responded alone for 15 minutes in the frequency regulation mode.
  • the control part (101, 202) may perform charge or discharge through the second battery part (120, 220) for the frequency regulation operation.
  • the frequency variation width is less than 5% of the reference frequency, that is, when the variation is sensed in a range of more than 57Hz to less than 63Hz in the case where the reference frequency is 60Hz
  • the charge or the discharge may be performed through the second battery part (120, 220) with excellent energy performance.
  • At least one of energy density (specific energy) and charge/discharge cycle life may be different.
  • the first battery part (110, 210) may have energy density (specific energy) lower than that of the second battery part (120, 220), and have charge/discharge cycle life longer than that of the second battery part (120, 220).
  • the first battery part (110, 210) may comprise an electric double layer capacitor (EDLC) or a lithium secondary battery including a lithium-titanium oxide (LTO), and the second battery part (120, 220) may comprise a lithium secondary battery including a lithium nickel-cobalt-aluminum (NCA) oxide, a lithium secondary battery including a lithium nickel-manganese-cobalt (NMC) oxide, or a redox flow battery.
  • EDLC electric double layer capacitor
  • LTO lithium-titanium oxide
  • the second battery part (120, 220) may comprise a lithium secondary battery including a lithium nickel-cobalt-aluminum (NCA) oxide, a lithium secondary battery including a lithium nickel-manganese-cobalt (NMC) oxide, or a redox flow battery.
  • NCA lithium nickel-cobalt-aluminum
  • NMC lithium nickel-manganese-cobalt
  • control part (102, 202) may be provided to measure SOC (state of charge) values of the first battery part (110, 210) and the second battery part (120, 220), respectively. Furthermore, the control part (102, 202) may be provided to control the charge and the discharge of the first battery part and the second battery part, respectively, for frequency regulation operation depending on the degree of frequency variation in the grid power system (101, 201) and the SOC value of each battery part (110, 210, 120, 220).
  • the charge/discharge system (100, 200) may further comprise a solar power generation part and a wind power generation part connected to the grid power system.
  • the solar power generation part and the wind power generation part constitute the aforementioned new renewable power generation part (140, 240).
  • the wind power generation part also has a relatively greater frequency variation width than that of the solar power generation part.
  • control part (101, 201) may perform charge or discharge through the first battery part (110, 120) for frequency regulation operation, upon frequency variation by the wind power generation part.
  • the first operation mode may correspond to the frequency regulation operation in a high power battery or capacity with excellent power performance
  • the second operation mode may correspond to the battery with excellent energy performance

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention relates to a hybrid charge/discharge system, which relates to a hybrid charge/discharge system capable of selective operation in high power or high energy in frequency regulation operation of grid power systems, improving economic efficiency, and maximizing life. In the system that heterogeneous battery systems with different powers are connected in parallel to a grid power system, the first operation mode may correspond to the frequency regulation operation in a high power battery or capacity with excellent power performance, and the second operation mode may correspond to the battery with excellent energy performance.

Description

[Corrected under Rule 26, 09.07.2020] HYBRID CHARGE/DISCHARGE SYSTEM
The present invention relates to a hybrid charge/discharge system, which relates to a hybrid charge/discharge system capable of selective operation in high power or high energy in frequency regulation operation of grid power systems, improving economic efficiency, and maximizing life.
This work was supported by the Korea Institute of Energy Technology Evaluation and Planning(KETEP) through the Ministry of Trade, Industry and Energy (Grant Number: 20172410104630)
In the grid power system, a power generation part for transmission and distribution (including a generator and a substation) and a plurality of loads are electrically connected.
Meanwhile, a function of maintaining power quality such as frequency stabilization of the transmission and distribution power by the grid power system is required, and when the demand for the transmission and distribution power has exceeded the supply, the frequency is lowered, and conversely, when the supply has exceeded the demand, the frequency is increased. At this time, when the frequency has been lowered, the generation power is increased, and when the frequency is increased, the generation power is decreased, thereby stably operating the frequency of the grid power system.
In the grid power system, a charge/discharge system, which can be charged from the grid power system and discharged to the grid power system, is used for frequency control.
The charge/discharge system is provided such that the discharge to the grid power system is performed when the frequency of the grid power system has been lowered, and that the charge from the grid power system is performed when the frequency of the grid power system has been increased.
In the conventional charge/discharge system, when a plurality of batteries is used, the frequency regulation has been often performed in consideration of only the SOC values of the batteries.
However, in recent charge/discharge systems, a design that considers not only SOC value, but also economic efficiency and life together is required.
In the frequency regulation of grid power systems, it is a technical problem of the present invention to provide a hybrid charge/discharge system capable of selective operation in high power or high energy.
In addition, it is a technical problem of the present invention to provide a hybrid charge/discharge system capable of improving economic efficiency and maximizing life.
In order to solve the above-described problems, according to one aspect of the present invention, a hybrid charge/discharge system is provided, which comprises a first battery part that can be charged from a grid power system, is provided to be capable of being discharged to each of the grid power system and loads connected to the grid power system, and has a first charge/discharge rate (C-rate), a second battery part that is connected in parallel to the first battery part in the grid power system, can be charged from the grid power system, is provided to be capable of being discharged to each of the grid power system and loads connected to the grid power system, and has a second charge/discharge rate lower than the first charge/discharge rate (C-rate), and a control part provided so as to control each of charge and discharge of the first battery part and the second batter part depending on the degree of frequency variation, for sensing the frequency variation of the grid power system and suppressing the frequency variation.
As described above, the hybrid charge/discharge system related to at least one example of the present invention has the following effects.
In the system that heterogeneous battery systems with different powers are connected in parallel to a grid power system, the first operation mode (primary frequency regulation (governor free, 15 minutes)) may correspond to the frequency regulation operation in a high power battery or capacity with excellent power performance, and the second operation mode (secondary frequency regulation (automatic generation control, 30 minutes)) may correspond to the battery with excellent energy performance.
In addition, when the frequency change occurs through the grid power system, the effective operation mode of the battery for adjusting the frequency is designed by a method of being responded in the first battery part (primary) with high power for up to 15 minutes according to the first operation mode through the initial detection and then additionally responded in the second battery part (secondary), whereby the price of the charge/discharge system can be reduced and the life can be extended. In particular, the life of the battery of the charge/discharge system for adjusting the frequency, which is usually operated for about 4 years or so, can be extended up to 10 years, and the efficiency of system configuration and operation can be increased by being classified into high power (primary) and high energy (secondary) through the characteristics required for the battery system for adjusting the frequency.
Figures 1 and 2 are schematic diagrams showing a hybrid charge/discharge system related to one example of the present invention.
Figure 3 is a table showing the energy density (specific energy), C-rate and cycle life according to the type of battery.
Figure 4 is a graph showing energy-power according to the type of battery.
Figure 5 is a graph showing power density-energy density according to the type of battery.
Hereinafter, a hybrid charge/discharge system according to one example of the present invention will be described in detail with reference to the accompanying drawings.
In addition, the same or similar reference numerals are given to the same or corresponding components regardless of reference numerals, of which redundant explanations will be omitted, and for convenience of explanation, the size and shape of each constituent member as shown may be exaggerated or reduced.
Figures 1 and 2 are schematic diagrams showing a hybrid charge/discharge system (hereinafter, abbreviated as 'charge/discharge system') related to one example of the present invention, and Figure 3 is a table showing the energy density (specific energy), C-rate and cycle life according to the type of battery.
In addition, Figure 4 is a graph showing energy-power according to the type of battery, and Figure 5 is a graph showing power density-energy density according to the type of battery.
The charge/discharge system (100, 200) related to one example of the present invention is electrically connected to a grid power system (101, 201). The grid power system (101) comprises one or more power generation parts (150, 250). The power generation part (150, 250) may comprise the remaining power generation part (for example, thermal power generation, etc.) except for a new renewable power generation part (140, 240) using a new renewable energy source (wind power, solar power, etc.), which is described below. The power generation part (150, 250) comprises a power plant and a substation, one or more of which may be provided in the grid power system. In addition, one or more loads that accommodate the power produced by the power generation part may be connected to the grid power system (101, 201).
The charge/discharge system (100, 200) comprises a first battery part (110, 210), a second battery part (210, 220), and a control part (102, 202).
The control part (102, 202) may also be provided to control only the charge/discharge system (100, 200), and may also be provided to control the charge/discharge system (100, 200) and the grid power system (101, 201) together. In addition, the control part (102, 202) may be provided to sense the supply and demand of the grid power system, to sense the frequency variation of the grid power system, and to sense SOC values of the respective battery parts.
The charge/discharge system (100, 200) comprises a first battery part (110, 120) which can be charged from a grid power system, is provided to be capable of being discharged to each of the grid power system and the loads connected to the grid power system and has a first charge/discharge rate (C-rate). The first battery part (110, 120) may comprise one or more batteries and a bi-directional AC-DC converter.
In addition, the charge/discharge system (100, 200) comprises a second battery part (120, 220) connected in parallel to the first battery part (110, 120) in the grid power system. The second battery part (120, 220) can be charged from the grid power system, and is provided to be capable of being discharged to each of the grid power system and loads connected to the grid power system. Also, the second battery part (120, 220) has a second charge/discharge rate lower than the first charge/discharge rate (C-rate). Furthermore, the second battery part (120, 220) may comprise one or more batteries and a bi-directional AC-DC converter.
That is, the charge/discharge system (100, 200) may comprise heterogeneous battery parts with different powers.
In addition, the charge/discharge system (100, 200) comprises a control part (102, 202) provided so as to control each of charge and discharge of the first battery part and the second batter part depending on the degree of frequency variation, for sensing the frequency variation of the grid power system (101, 201) and suppressing the frequency variation.
That is, when the frequency of the grid power system (101, 201) is lower than the reference frequency (for example, 60Hz), the control part (102, 202) is provided such that the discharge is performed to the grid power system using the first battery part (110, 210) or the second battery part (120, 220), and conversely, when the frequency of the grid power system (101, 201) is higher than the reference frequency, the control part (102, 202) is provided such that the charge is performed from the grid power system (101, 201) using the first battery part or the second battery part upon increasing the frequency of the grid power system.
In this document, when the frequency variation occurs in the grid power system as such, the control of the charge/discharge in one or more battery parts for the purpose of suppressing the frequency variation may be referred to as frequency regulation operation (or frequency regulation mode).
Referring to Figure 1, the charge/discharge system (100) related to the first example of the present invention may further comprise a switch part (130) for electrically connecting the first battery part (110) and the second battery part (120) to the grid power system (101) selectively. That is, as the control part (101) controls the switch part (130), only the first battery part (110) may be connected to the grid power system (101) upon performing the frequency regulation operation using the first battery part (110), and alternatively, only the second battery part (120) may be connected to the grid power system (101) upon performing the frequency regulation operation using the second battery part (120).
Referring to Figure 2, the charge/discharge system (200) related to the second example of the present invention may comprise a PCS part (230) electrically connected to the first and second battery parts (210, 220).
The first and second examples differ only whether or not the switch part and the PCS part are added, and are the same for the charge/discharge control upon frequency variation of the grid power system, whereby they are to be explained together below.
At this time, the first charge/discharge rate may be 2 to 9 times the second charge/discharge rate. For example, the ratio of the first charge/discharge rate to the second charge/discharge rate may be 2 to 9:1 (2:1 to 9:1).
In addition, when the frequency variation width of the grid power system is greater than or equal to a predetermined value, the control part (102, 202) may perform charge or discharge through the first battery part (110, 210) for the frequency regulation operation. For example, when the frequency variation width is 5% or more of the reference frequency (predetermined value), that is, when it is 63Hz or more, or 57HZ or less in the case where the reference frequency is 60Hz, the charge or the discharge may be performed through the first battery part (110, 210) with high power. The first battery part (110, 210) is provided to be capable of being responded alone for 15 minutes in the frequency regulation mode.
Furthermore, when the frequency variation width is less than the predetermined value, the control part (101, 202) may perform charge or discharge through the second battery part (120, 220) for the frequency regulation operation. For example, when the frequency variation width is less than 5% of the reference frequency, that is, when the variation is sensed in a range of more than 57Hz to less than 63Hz in the case where the reference frequency is 60Hz, the charge or the discharge may be performed through the second battery part (120, 220) with excellent energy performance.
Referring to Figures 3 to 5, in the first battery part (110, 210) and the second battery part (120, 220), at least one of energy density (specific energy) and charge/discharge cycle life may be different.
In addition, the first battery part (110, 210) may have energy density (specific energy) lower than that of the second battery part (120, 220), and have charge/discharge cycle life longer than that of the second battery part (120, 220).
For example, the first battery part (110, 210) may comprise an electric double layer capacitor (EDLC) or a lithium secondary battery including a lithium-titanium oxide (LTO), and the second battery part (120, 220) may comprise a lithium secondary battery including a lithium nickel-cobalt-aluminum (NCA) oxide, a lithium secondary battery including a lithium nickel-manganese-cobalt (NMC) oxide, or a redox flow battery.
That is, as a combination of the first battery part (110, 210) and the second battery part (120, 220), for example, six combinations may be possible, and specifically, the combination of the ELDC and the lithium secondary battery (NCA), the combination of the ELDC and the lithium secondary battery (NMC), the combination of the ELDC and the redox flow battery, the combination of the lithium secondary battery (LTO) and the lithium secondary battery (NCA), the combination of the lithium secondary battery (LTO) and the lithium secondary battery (NMC) ), or the combination of the lithium secondary battery (LTO) and the redox flow battery is possible.
Also, the control part (102, 202) may be provided to measure SOC (state of charge) values of the first battery part (110, 210) and the second battery part (120, 220), respectively. Furthermore, the control part (102, 202) may be provided to control the charge and the discharge of the first battery part and the second battery part, respectively, for frequency regulation operation depending on the degree of frequency variation in the grid power system (101, 201) and the SOC value of each battery part (110, 210, 120, 220).
In addition, the charge/discharge system (100, 200) may further comprise a solar power generation part and a wind power generation part connected to the grid power system. The solar power generation part and the wind power generation part constitute the aforementioned new renewable power generation part (140, 240). The wind power generation part also has a relatively greater frequency variation width than that of the solar power generation part.
At this time, the control part (101, 201) may perform charge or discharge through the first battery part (110, 120) for frequency regulation operation, upon frequency variation by the wind power generation part.
Conversely, the control part (102, 202) may perform charge or discharge through the second battery part for frequency regulation operation, upon frequency variation by the solar power generation part.
The preferred examples of the present invention as described above are disclosed for illustrative purposes, which can be modified, changed and added within thought and scope of the present invention by those skilled in the art and it will be considered that such modification, change and addition fall within the following claims.
In the system that heterogeneous battery systems with different powers are connected in parallel to a grid power system, the first operation mode (primary frequency regulation (governor free, 15 minutes)) may correspond to the frequency regulation operation in a high power battery or capacity with excellent power performance, and the second operation mode (secondary frequency regulation (automatic generation control, 30 minutes)) may correspond to the battery with excellent energy performance.

Claims (10)

  1. A hybrid charge/discharge system comprising: a first battery part that can be charged from a grid power system, is provided to be capable of being discharged to each of the grid power system and loads connected to the grid power system, and has a first charge/discharge rate (C-rate);
    a second battery part that is connected in parallel to the first battery part in the grid power system, can be charged from the grid power system, is provided to be capable of being discharged to each of the grid power system and loads connected to the grid power system, and has a second charge/discharge rate lower than the first charge/discharge rate (C-rate); and
    a control part provided so as to control each of charge and discharge of the first battery part and the second batter part depending on the degree of frequency variation, for sensing the frequency variation of the grid power system and suppressing the frequency variation.
  2. The hybrid charge/discharge system according to claim 1,
    wherein the first charge/discharge rate is 2 to 9 times the second charge/discharge rate.
  3. The hybrid charge/discharge system according to claim 1,
    wherein the control part performs charge or discharge through the first battery part for frequency regulation operation, when the frequency variation width is greater than or equal to a predetermined value.
  4. The hybrid charge/discharge system according to claim 3,
    wherein the control part performs charge or discharge through the second battery part for frequency regulation operation, when the frequency variation width is less than a predetermined value.
  5. The hybrid charge/discharge system according to claim 1,
    wherein in the first battery part and the second battery part, at least one of energy density (specific energy) and charge/discharge cycle life is different.
  6. The hybrid charge/discharge system according to claim 5,
    wherein the first battery part has energy density lower than that of the second battery part, and has charge/discharge cycle life longer than that of the second battery part.
  7. The hybrid charge/discharge system according to claim 1,
    wherein the first battery part comprises an electric double layer capacitor (ELDC) or a lithium secondary battery including a lithium-titanium oxide (LTO).
  8. The hybrid charge/discharge system according to claim 1,
    wherein the second battery part comprises a lithium secondary battery including a lithium nickel-cobalt-aluminum (NCA) oxide, a lithium secondary battery including a lithium nickel-manganese-cobalt (NMC) oxide, or a redox flow battery.
  9. The hybrid charge/discharge system according to claim 1,
    wherein the control part is provided to measure SOC (state of charge) values of the first battery part and the second battery part, respectively, and
    the control part is provided to control charge and discharge of the first battery part and the second battery part, respectively, for frequency regulation operation depending on the degree of frequency variation in the grid power system and the SOC value of each battery part.
  10. The hybrid charge/discharge system according to claim 1,
    further comprising a solar power generation part and a wind power generation part connected to the grid power system,
    wherein the control part performs charge or discharge through the first battery part for frequency regulation operation, upon frequency variation by the wind power generation part, and
    the control part performs charge or discharge through the second battery part for frequency regulation operation, upon frequency variation by the solar power generation part.
PCT/KR2020/007443 2020-06-09 2020-06-09 Hybrid charge/discharge system WO2021251512A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080179887A1 (en) * 2007-01-26 2008-07-31 Hironari Kawazoe Hybrid power generation of wind-power generator and battery energy storage system
US20120049517A1 (en) * 2010-08-26 2012-03-01 Mitsubishi Heavy Industries, Ltd. Wind turbine generator and output power control method
KR20140130890A (en) * 2013-05-02 2014-11-12 이엔테크놀로지 주식회사 System for lowing capacity of the battery by stabilizing the output
KR20150103840A (en) * 2014-03-04 2015-09-14 삼성에스디아이 주식회사 Energy storage system and method for controlling thereof
KR20170129456A (en) * 2016-05-17 2017-11-27 엘에스산전 주식회사 Battery energy storage system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080179887A1 (en) * 2007-01-26 2008-07-31 Hironari Kawazoe Hybrid power generation of wind-power generator and battery energy storage system
US20120049517A1 (en) * 2010-08-26 2012-03-01 Mitsubishi Heavy Industries, Ltd. Wind turbine generator and output power control method
KR20140130890A (en) * 2013-05-02 2014-11-12 이엔테크놀로지 주식회사 System for lowing capacity of the battery by stabilizing the output
KR20150103840A (en) * 2014-03-04 2015-09-14 삼성에스디아이 주식회사 Energy storage system and method for controlling thereof
KR20170129456A (en) * 2016-05-17 2017-11-27 엘에스산전 주식회사 Battery energy storage system

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