CN113595119A - Thermal power hybrid energy storage high-penetration low-penetration coordination control system - Google Patents
Thermal power hybrid energy storage high-penetration low-penetration coordination control system Download PDFInfo
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- CN113595119A CN113595119A CN202110876193.7A CN202110876193A CN113595119A CN 113595119 A CN113595119 A CN 113595119A CN 202110876193 A CN202110876193 A CN 202110876193A CN 113595119 A CN113595119 A CN 113595119A
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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
- H02J3/28—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
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- 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
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A thermal power hybrid energy storage high-voltage-drive low-voltage-drive coordination control system comprises: a factory alternating current 6.3kV unit and a hybrid energy storage unit; and the station AC 6.3kV unit exchanges power with the hybrid energy storage unit through the PCS converter. The invention adopts the station AC 6.3kV unit AC middle bidirectional PCS converter, can realize power bidirectional transmission, and when the hybrid energy storage unit is required to supply AC power to the station AC 6.3kV unit, the station AC 6.3kV unit AC middle bidirectional PCS converter works in an inversion state. When the hybrid energy storage unit is required to absorb electric energy, the bidirectional PCS converter in the station AC 6.3kV unit AC works in a rectification state.
Description
Technical Field
The invention relates to a thermal power hybrid energy storage high-voltage and low-voltage penetration coordination control system, in particular to a thermal power hybrid energy storage energy management system. No matter the thermal power hybrid energy storage high-voltage ride-through and low-voltage ride-through coordination control system is under a high-voltage ride-through working condition or a low-voltage ride-through working condition, the lithium ion battery pack and the super capacitor can jointly maintain the voltage stability of the direct-current bus, and the thermal power hybrid energy storage high-voltage ride-through and low-voltage ride-through coordination control is realized.
Background
The large-scale energy storage technology serving as one of key technical supports of energy transformation in China has attracted extensive attention in the industry in recent years because the large-scale energy storage technology can provide various auxiliary services such as peak shaving, frequency modulation, emergency response and the like for a power grid. The distributed hybrid energy storage system consists of a lithium ion battery and a super capacitor, is connected with a power grid through a current converter, has power bidirectional flow capacity, and has the advantages of rapid power regulation, various application modes and the like. In a hybrid energy storage system, a lithium ion battery has the characteristic of high energy density but is not suitable for frequent charging and discharging, and a super capacitor has the advantage of high power density.
In addition to the Low Voltage Ride Through (LVRT) capability of the energy storage device during a fault such as grounding, the High Voltage Ride Through (HVRT) capability of the energy storage device during a working condition such as load shedding, large capacitance switching, single-phase grounding non-fault phase voltage sudden rise is also required.
Disclosure of Invention
The invention provides a thermal power hybrid energy storage high-voltage and low-voltage penetration coordination control system, which constructs a thermal power hybrid energy storage energy management system and provides a hybrid energy storage system coordination control strategy with a super capacitor having priority over a lithium ion battery for post-compensation in the thermal power hybrid energy storage high-voltage and low-voltage penetration coordination control system. No matter the thermal power hybrid energy storage high-voltage ride-through and low-voltage ride-through coordination control system is under a high-voltage ride-through working condition or a low-voltage ride-through working condition, the lithium ion battery pack and the super capacitor can jointly maintain the voltage stability of the direct-current bus, and the thermal power hybrid energy storage high-voltage ride-through and low-voltage ride-through coordination control is realized.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a thermal power hybrid energy storage high-voltage-drive low-voltage-drive coordination control system comprises: a factory alternating current 6.3kV unit and a hybrid energy storage unit; and the station AC 6.3kV unit exchanges power with the hybrid energy storage unit through the PCS converter.
In a further development of the invention, the service ac 6.3kV unit comprises: the transformer comprises a 20 kV-to-6.3 kV split winding transformer, a 6.3kV AC station A section, a 6.3kV AC station B section, an AC load switch, a station AC load, a station AC-station DC interconnection switch, a 6.3 kV-to-10 kV double winding transformer and a bidirectional PCS converter;
the 20kV becomes 6.3kV split winding transformer high pressure side and is connected to the generator export, and the electric energy comes from the generator, two branches in the 20kV becomes 6.3kV split winding transformer low pressure side are connected with respectively: 6.3kV AC station is with A section, 6.3kV AC station is with B section, to station A branch, station is with alternating current load passing through alternating current load switch is connected to 6.3kV AC station is with A section, 6.3kV becomes 10kV bifilar transformer low pressure side and passes through station is with exchanging-station is with direct current tie switch and is connected to 6.3kV AC station is with A section, 6.3kV becomes 10kV bifilar transformer low pressure side and passes through two-way PCS transverter with medium voltage direct current bus connects.
A further development of the invention is that the hybrid energy storage unit comprises: the system comprises a 6kV medium-voltage direct-current bus, a lithium ion battery energy storage system direct-current circuit breaker, a lithium ion battery energy storage system DC-DC current conversion device, a lithium ion battery pack, a super capacitor energy storage system direct-current circuit breaker, a super capacitor energy storage system DC-DC current conversion device and a super capacitor pack;
the lithium ion battery pack is connected with the 6kV medium-voltage direct-current bus through the lithium ion battery energy storage system DC-DC converter device and the lithium ion battery energy storage system direct-current circuit breaker, and the super capacitor pack is connected with the 6kV medium-voltage direct-current bus through the super capacitor energy storage system DC-DC converter device and the super capacitor energy storage system direct-current circuit breaker.
The further improvement of the invention is that in order to realize hybrid energy storage coordination control, the lithium ion battery pack and the super capacitor pack jointly maintain the voltage stability of the 6kV medium-voltage direct-current bus during HVRT and LVRT periods, and a hybrid energy storage system coordination control strategy that the super capacitor takes precedence over the accumulator and then supplements is adopted.
The invention is further improved in that when the voltage of the 6kV medium-voltage direct-current bus is detected, the direct-current bus voltage of the 6kV medium-voltage direct-current bus is detected
The super capacitor bank enters a high-penetration charging state, and the power feedforward control enables the super capacitor bank control system to quickly respondThe voltage should be increased.
The invention is further improved in that when the 6kV medium-voltage direct-current bus voltage U is higher than the standard valuedc≥UL1The energy management system detects that the upper limit i of the charging current of the super capacitor bank is reachedCmaxAnd at the moment, entering a common charging state, and putting the lithium ion battery pack into operation to maintain the voltage stability of the 6kV medium-voltage direct-current bus.
The invention is further improved when the 6kV medium-voltage direct-current bus voltage
At the moment, a voltage drop fault occurs, and the super capacitor bank is discharged preferentially to maintain stable power; along with the increase of the voltage drop amplitude, namely the voltage U of the 6kV medium-voltage direct-current busdc∈[UL3 UL2) And at the moment, the lithium ion battery pack is put into operation, and a converter control system stabilizes the 6kV medium-voltage direct-current bus to U through a constant-voltage current-limiting control strategyL2(ii) a When U is turneddc＜UL3And determining that the system has a low-voltage fault, and cutting off the operation of the lithium ion battery pack and the super capacitor pack.
The invention has the further improvement that the coordination control strategy of the hybrid energy storage system with the super capacitor for supplementing the storage battery after priority is divided into the following steps: a common charge state and a supercapacitor discharge state.
Compared with the prior art, the invention has at least the following beneficial technical effects:
1. the invention adopts the station AC 6.3kV unit AC middle bidirectional PCS converter, can realize power bidirectional transmission, and when the hybrid energy storage unit is required to supply AC power to the station AC 6.3kV unit, the station AC 6.3kV unit AC middle bidirectional PCS converter works in an inversion state. When the hybrid energy storage unit is required to absorb electric energy, the bidirectional PCS converter in the station AC 6.3kV unit AC works in a rectification state.
2. In order to realize the voltage accurate control of the lithium ion battery energy storage and the super capacitor energy storage at HVRT and LVRT, the invention adopts a DC-DC converter device, and in a hybrid energy storage control system, a hybrid energy storage system coordination control strategy that the super capacitor takes priority to supplement the lithium ion battery is adopted with the aim of maintaining the direct current bus voltage during the HVRT and LVRT.
3. The thermal power and electricity hybrid energy storage high-penetration low-penetration coordination control method provided by the invention can exert the characteristics of flexible power allocation and reactive power output priority of the storage battery, and the characteristics of quick charge and discharge of the super capacitor and quick absorption of unbalanced energy on the direct current side during HVRT and LVRT periods.
Drawings
FIG. 1 is a schematic diagram of a thermal power and electric hybrid energy storage connection.
Fig. 2 is a schematic diagram of thermal power and electric power hybrid energy storage coordination control.
Description of reference numerals:
1-factory alternating current 6.3kV unit; 2-a hybrid energy storage unit; 1-20 kV to 6.3kV split winding transformer; 1-2-6.3 kV AC station A section; a B section for 1-3-6.3 kV alternating current factories; 1-4-ac load switch; 1-5-factory alternating current load; 1-6-house AC-house DC interconnection switch; 1-7-6.3 kV to 10kV double-winding transformer; 1-8-bidirectional PCS converter; 2-1-6 kV medium-voltage direct-current bus; 2-a lithium ion battery energy storage system direct current breaker; 2-3-a lithium ion battery energy storage system DC-DC converter; 2-4-a lithium ion battery pack; 2-5-a super capacitor energy storage system direct current breaker; 2-6-a super capacitor energy storage system DC-DC converter device; 2-7-super capacitor group.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings.
As shown in fig. 1, the high-voltage side of the 20 kV-to-6.3 kV split winding transformer 1-1 is connected to the outlet of the generator, the electric energy comes from the generator, and two branches of the low-voltage side of the 20 kV-to-6.3 kV split winding transformer 1-1 are respectively connected with: the section A for 6.3kV alternating current plant is 1-2, and the section B for 6.3kV alternating current plant is 1-3. Taking a branch A for a plant as an example, the AC load 1-5 for the plant is connected to the section A1-2 for the 6.3kV AC plant through the AC load switch 1-4, the low-voltage side of the 6.3kV to 10kV double-winding transformer 1-7 is connected to the section A1-2 for the 6.3kV AC plant through the AC-DC interconnection switch 1-6 for the plant, and the low-voltage side of the 6.3kV to 10kV double-winding transformer 1-7 is connected with the medium-voltage DC bus 2-1 through the bidirectional PCS converter 1-8. Because of the centralized current conversion, the technical difficulty is relatively simple, and the problem of harmonic pollution to a power grid due to the large-range application does not exist as an isolated system.
The lithium ion battery pack 2-4 is connected with the 6kV medium-voltage direct-current bus 2-1 through the lithium ion battery energy storage system DC-DC converter device 2-3 and the lithium ion battery energy storage system direct-current breaker 2-2, the lithium ion battery energy storage system DC-DC converter device 2-3 is low in equipment investment, the problem of harmonic pollution to a power grid due to large-range application does not exist as an isolated system, the voltage of the lithium ion battery energy storage system DC-DC converter device 2-3 is flexibly controlled, and accurate voltage control can be achieved in both an HVRT period and an LVRT period. The super capacitor group 2-7 is connected with the 6kV medium-voltage direct-current bus 2-1 through the super capacitor energy storage system DC-DC converter device 2-6 and the super capacitor energy storage system direct-current breaker 2-5, the super capacitor energy storage system DC-DC converter device 2-6 is low in equipment investment, the super capacitor energy storage system DC-DC converter device 2-6 is used as an isolated system, the harmonic pollution problem of the wide-range application to a power grid does not exist, the super capacitor energy storage system DC-DC converter device 2-6 is flexible in voltage control, and accurate voltage control can be achieved in both HVRT periods and LVRT periods.
As shown in fig. 2, in order to implement hybrid energy storage coordination control, during HVRT and LVRT, the lithium ion battery pack 2-4 and the super capacitor pack 2-7 jointly maintain the voltage of the 6kV medium voltage dc bus 2-1 to be stable, the present invention provides a coordination control strategy of a hybrid energy storage system with super capacitors for the back compensation of the storage battery, and the control strategy can be divided into: a common charge state and a super capacitor charge state. When the voltage of the 6kV medium-voltage direct-current bus 2-1 direct-current bus is detected
The super capacitor bank 2-7 enters a high-penetration charging state, and the power feedforward control enables the fast response voltage of the super capacitor bank 2-7 control system to be increased; when the voltage of the 6kV medium-voltage direct-current bus is U from 2 to 1dc≥UL1Energy ofThe management system detects that the upper limit i of the charging current of the super capacitor bank 2-7 is reachedCmaxWhen the lithium ion battery pack enters a common charging state, 2-4 of the lithium ion battery pack is put into operation to maintain the voltage stability of the 6kV medium-voltage direct-current bus 2-1; when the voltage of the 6kV medium-voltage direct-current bus is 2-1
At the moment, a voltage drop fault occurs, and the super capacitor bank 2-7 discharges preferentially to maintain stable power; along with the increase of the voltage drop amplitude, namely the voltage U of the 6kV medium-voltage direct-current bus 2-1dc∈[UL3 UL2) And at the moment, the lithium ion battery pack 2-4 is put into operation, and a converter control system stabilizes the 6kV medium-voltage direct-current buses 2-1 to U through a constant-voltage current-limiting control strategyL2(ii) a When U is turneddc＜UL3And judging that the system has an undervoltage fault, and cutting off the operation of the lithium ion battery pack 2-4 and the super capacitor pack 2-7.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. The utility model provides a low coordinated control system that wears of high wearing of thermal power hybrid energy storage which characterized in that includes: a factory alternating current 6.3kV unit (1) and a hybrid energy storage unit (2); the station AC 6.3kV unit (1) exchanges power with the hybrid energy storage unit (2) through the PCS converter.
2. The thermal power hybrid energy storage high-voltage and low-voltage ride-through coordination control system according to claim 1, wherein the service alternating current 6.3kV unit (1) comprises: the transformer comprises a 20kV to 6.3kV split winding transformer (1-1), a 6.3kV AC station A section (1-2), a 6.3kV AC station B section (1-3), an AC load switch (1-4), a station AC load (1-5), a station AC-station DC interconnection switch (1-6), a 6.3kV to 10kV double winding transformer (1-7) and a bidirectional PCS converter (1-8);
the high-voltage side of the 20 kV-to-6.3 kV split winding transformer (1-1) is connected to an outlet of a generator, electric energy is from the generator, and two branches of the low-voltage side of the 20 kV-to-6.3 kV split winding transformer (1-1) are respectively connected with: 6.3kV ac power plant is with A section (1-2), 6.3kV ac power plant is with B section (1-3), to the branch of plant A, plant ac load (1-5) pass through ac load switch (1-4) are connected to 6.3kV ac power plant is with A section (1-2), 6.3kV becomes 10kV bifilar transformer (1-7) low pressure side and passes through plant ac-plant DC tie switch (1-6) are connected to 6.3kV ac power plant is with A section (1-2), 6.3kV becomes 10kV bifilar transformer (1-7) low pressure side and passes through two-way PCS transverter (1-8) with medium voltage DC bus (2-1) connect.
3. The thermal power and electric hybrid energy storage high-voltage and low-voltage ride-through coordination control system according to claim 2, wherein the hybrid energy storage unit (2) comprises: the system comprises a 6kV medium-voltage direct-current bus (2-1), a lithium ion battery energy storage system direct-current circuit breaker (2-2), a lithium ion battery energy storage system DC-DC converter device (2-3), a lithium ion battery pack (2-4), a super capacitor energy storage system direct-current circuit breaker (2-5), a super capacitor energy storage system DC-DC converter device (2-6) and a super capacitor pack (2-7);
the lithium ion battery pack (2-4) is connected with the 6kV medium-voltage direct-current bus (2-1) through the lithium ion battery energy storage system DC-DC converter device (2-3) and the lithium ion battery energy storage system direct-current circuit breaker (2-2), and the super capacitor pack (2-7) is connected with the 6kV medium-voltage direct-current bus (2-1) through the super capacitor energy storage system DC-DC converter device (2-6) and the super capacitor energy storage system direct-current circuit breaker (2-5).
4. The thermal power hybrid energy storage high-voltage-ride-through low-voltage-ride-through coordination control system according to claim 3, characterized in that in order to realize hybrid energy storage coordination control, the lithium ion battery packs (2-4) and the super capacitor packs (2-7) jointly maintain the voltage of the 6kV medium-voltage direct-current bus (2-1) to be stable during HVRT and LVRT, and a hybrid energy storage system coordination control strategy of super capacitor-priority battery post-compensation is adopted.
5. The thermal power hybrid energy storage high-voltage-penetration low-voltage-penetration coordination control system according to claim 4, characterized in that when the voltage of the 6kV medium-voltage direct-current bus (2-1) direct-current bus is detected
And the super capacitor bank (2-7) enters a high-penetration charging state, and the power feed-forward control enables the super capacitor bank (2-7) to control the system to quickly respond to the voltage increase.
6. The thermal power hybrid energy storage high-voltage-penetration low-voltage-penetration coordination control system according to claim 4, characterized in that when the voltage U of the 6kV medium-voltage direct-current bus (2-1)dc≥UL1The energy management system detects that the upper limit i of the charging current of the super capacitor bank (2-7) is reachedCmaxAnd at the moment, the lithium ion battery pack (2-4) enters a common charging state and is put into operation to maintain the voltage stability of the 6kV medium-voltage direct-current bus (2-1).
7. The thermal power hybrid energy storage high-voltage-penetration low-voltage-penetration coordination control system according to claim 4, characterized in that when the voltage of the 6kV medium-voltage direct-current bus (2-1)
At the moment, a voltage drop fault occurs, and the super capacitor bank (2-7) is discharged preferentially to maintain stable power; along with the increase of the voltage drop amplitude, namely the voltage U of the 6kV medium-voltage direct-current bus (2-1)dc∈[UL3 UL2) And at the moment, the lithium ion battery pack (2-4) is put into operation, and a converter control system stabilizes the 6kV medium-voltage direct-current bus (2-1) to U through a constant-voltage current-limiting control strategyL2(ii) a When U is turneddc＜UL3And judging that the system has an undervoltage fault, and cutting off the operation of the lithium ion battery packs (2-4) and the super capacitor packs (2-7).
8. The thermal power hybrid energy storage high-voltage-penetration low-voltage-penetration coordination control system according to claim 4, wherein a hybrid energy storage system coordination control strategy of a super capacitor with priority for supplementing a storage battery comprises the following steps: a common charge state and a supercapacitor discharge state.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110876193.7A CN113595119A (en) | 2021-07-30 | 2021-07-30 | Thermal power hybrid energy storage high-penetration low-penetration coordination control system |
| PCT/CN2022/102517 WO2023005582A1 (en) | 2021-07-30 | 2022-06-29 | High voltage ride through and low voltage ride through coordinated control system for thermal power hybrid energy storage |
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| CN202110876193.7A CN113595119A (en) | 2021-07-30 | 2021-07-30 | Thermal power hybrid energy storage high-penetration low-penetration coordination control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114825410A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Medium-voltage direct-current energy storage system for thermal power plant |
| WO2023005582A1 (en) * | 2021-07-30 | 2023-02-02 | 西安热工研究院有限公司 | High voltage ride through and low voltage ride through coordinated control system for thermal power hybrid energy storage |
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| CN113595119A (en) * | 2021-07-30 | 2021-11-02 | 西安热工研究院有限公司 | Thermal power hybrid energy storage high-penetration low-penetration coordination control system |
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2021
- 2021-07-30 CN CN202110876193.7A patent/CN113595119A/en active Pending
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2022
- 2022-06-29 WO PCT/CN2022/102517 patent/WO2023005582A1/en active Application Filing
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| CN102931687A (en) * | 2012-10-12 | 2013-02-13 | 华北电力大学（保定） | Power adjustment method for hybrid energy storage photovoltaic power station |
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| WO2023005582A1 (en) | 2023-02-02 |
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