CN216851308U - Flywheel lithium battery hybrid energy storage system - Google Patents
Flywheel lithium battery hybrid energy storage system Download PDFInfo
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- CN216851308U CN216851308U CN202220325108.8U CN202220325108U CN216851308U CN 216851308 U CN216851308 U CN 216851308U CN 202220325108 U CN202220325108 U CN 202220325108U CN 216851308 U CN216851308 U CN 216851308U
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Abstract
The utility model provides a pair of flywheel lithium electricity hybrid energy storage system, include: the station-service power supply unit, the flywheel lithium electricity hybrid energy storage power electronic voltage transformation unit and the flywheel lithium electricity hybrid energy storage power supply unit are arranged, wherein one end of the flywheel lithium electricity hybrid energy storage power electronic voltage transformation unit is connected with a station-service bus of the station-service power supply unit, and the other end of the flywheel lithium electricity hybrid energy storage power electronic voltage transformation unit is connected with the flywheel lithium electricity hybrid energy storage power supply unit. The flywheel lithium-electricity hybrid energy storage system adopting the power electronic transformer is constructed by adopting the flywheel lithium-electricity hybrid energy storage power supply unit, so that harmonic suppression and reactive compensation devices do not need to be configured, and related primary and secondary equipment for relay protection required by a power frequency transformer also does not need to be configured.
Description
Technical Field
The utility model relates to a thermoelectricity frequency modulation technical field, concretely relates to flywheel lithium electricity hybrid energy storage system.
Background
Along with the increase of the grid-connected quantity of wind power and photovoltaic power, the rapid development of interconnected large power grids, large-capacity power generation and long-distance power transmission, the frequency modulation task of a power system is heavier.
At present, the Chinese frequency modulation power supply mainly comprises a thermal power generating unit and a hydroelectric generating unit, and the working principle is that the active output of the units is adjusted and the frequency change of the system is tracked. Firstly, the thermal power generating unit and the hydroelectric generating unit generally have the problems of long response time lag, low unit climbing speed and the like, the power grid dispatching instruction cannot be accurately tracked, and the phenomena of regulation time delay, regulation deviation, regulation reversal and the like are exposed; secondly, the thermal power generating unit and the hydroelectric generating unit frequently change power to operate, fatigue and abrasion of the unit equipment are aggravated to a certain extent, and the operation life of the unit is influenced.
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. However, the conventional power frequency transformer is generally adopted in the current energy storage system, and is limited by the functions of the conventional power frequency alternating current transformer, and the energy storage system needs to be additionally provided with a harmonic suppression device, a reactive compensation device and relay protection equipment, so that the design cost and the maintenance cost of the energy storage system are increased.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming energy storage system needs extra configuration harmonic suppression, reactive power compensator and relay protection equipment among the prior art, leads to the defect that energy storage system design cost and maintenance cost rise to a flywheel lithium electricity hybrid energy storage system is provided.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the embodiment of the utility model provides a flywheel lithium electricity hybrid energy storage system, include: the station is with power supply unit, flywheel lithium electricity hybrid energy storage power electronics vary voltage unit and flywheel lithium electricity hybrid energy storage power supply unit, wherein, flywheel lithium electricity hybrid energy storage power electronics vary voltage unit's one end with station is with the station bus connection of power supply unit, flywheel lithium electricity hybrid energy storage power electronics vary voltage unit's the other end with flywheel lithium electricity hybrid energy storage power supply unit connects.
Optionally, the flywheel lithium-ion battery hybrid energy storage power electronic transformation unit includes: the system comprises a plurality of lithium battery power electronic transformers and a plurality of flywheel power electronic transformers, wherein the high-voltage side of each lithium battery power electronic transformer and the high-voltage side of each flywheel power electronic transformer are connected with the same service bus in the service power supply unit; every lithium cell power electronic transformer's low pressure side and every flywheel power electronic transformer low pressure side all with flywheel lithium electricity hybrid energy storage power supply unit connects.
Optionally, the lithium battery power electronic transformer comprises: the high-frequency DC-DC converter comprises a lithium battery high-voltage side converter, a lithium battery high-voltage side filter capacitor, a lithium battery high-frequency DC-DC transformer, a lithium battery low-voltage side filter capacitor and a lithium battery low-voltage side converter, wherein the AC side of the lithium battery high-voltage side converter is connected with a station bus, the high-voltage side of the lithium battery high-frequency DC-DC transformer is connected with the DC side of the lithium battery high-voltage side converter through the lithium battery high-voltage side filter capacitor, and the DC side of the lithium battery low-voltage side converter is connected with the low-voltage side of the lithium battery high-frequency DC-DC transformer through the lithium battery low-voltage side filter capacitor.
Optionally, the flywheel power electronic transformer comprises: the high-voltage side filter capacitor of the flywheel high-voltage side converter is connected with the station bus, the high-voltage side of the flywheel high-frequency DC-DC transformer is connected with the direct-current side of the flywheel high-voltage side converter through the flywheel high-voltage side filter capacitor, and the direct-current side of the flywheel low-voltage side converter is connected with the low-voltage side of the flywheel high-frequency DC-DC transformer through the flywheel low-voltage side filter capacitor.
Optionally, the plant power supply unit includes: high factory becomes, a plurality of high factory becomes branch circuit breaker, multistage factory with generating line and a plurality of circuit breaker of being incorporated into the power networks, wherein, high factory becomes the high-pressure side and is connected to the generator export, high factory becomes the low-voltage side and divide into a plurality of branches, every section factory is with the generating line all through one high factory becomes branch circuit breaker and is connected to high factory becomes a branch of low-voltage side, every section factory is with the generating line all through one incorporated into the power networks circuit breaker and every set among the flywheel lithium electricity hybrid energy storage power electronic voltage transformation unit lithium cell power electronic transformer links to each other, every section simultaneously factory is with the generating line still through one incorporated into the power networks circuit breaker and every set among the flywheel lithium electricity hybrid energy storage power electronic voltage transformation unit flywheel power electronic transformer links to each other.
Optionally, the flywheel lithium-ion battery hybrid energy storage power supply unit includes: the lithium battery energy storage and power supply system comprises a plurality of sets of lithium battery energy storage and power supply units and a plurality of sets of flywheel energy storage and power supply units, wherein the lithium battery energy storage and power supply units are arranged in one-to-one correspondence with the lithium battery power electronic transformers, and the flywheel energy storage and power supply units are arranged in one-to-one correspondence with the flywheel power electronic transformers; each set of lithium battery energy storage power supply unit is connected with the corresponding low-voltage end of the lithium battery power electronic transformer; each set of flywheel energy storage power supply unit is connected with the low-voltage end of the corresponding flywheel power electronic transformer.
Optionally, the lithium battery energy storage and power supply unit includes: the lithium battery energy storage direct-current-alternating-current converter comprises a lithium battery energy storage isolating switch, a lithium battery energy storage direct-current-alternating-current converter and a lithium battery energy storage device, wherein the alternating current side of the lithium battery energy storage direct-current-alternating-current converter is connected with the alternating current side of the lithium battery low-voltage side converter through the lithium battery energy storage isolating switch, and the direct current side of the lithium battery energy storage direct-alternating-current converter is connected with the lithium battery energy storage device.
Optionally, the flywheel energy storage power supply unit comprises: the flywheel energy storage AC-AC converter comprises a flywheel energy storage isolating switch, a flywheel energy storage AC-AC converter and a flywheel energy storage device, wherein the AC sending-out side of the flywheel energy storage AC-AC converter is connected with the AC side of the flywheel low-voltage side converter through the flywheel energy storage isolating switch, and the AC flowing-in side of the flywheel energy storage AC-AC converter is connected with the flywheel energy storage device.
The utility model discloses technical scheme has following advantage:
the utility model provides a pair of flywheel lithium electricity hybrid energy storage system, include: the station-service power supply unit, the flywheel lithium electricity hybrid energy storage power electronic voltage transformation unit and the flywheel lithium electricity hybrid energy storage power supply unit are arranged, wherein one end of the flywheel lithium electricity hybrid energy storage power electronic voltage transformation unit is connected with a station-service bus of the station-service power supply unit, and the other end of the flywheel lithium electricity hybrid energy storage power electronic voltage transformation unit is connected with the flywheel lithium electricity hybrid energy storage power supply unit. The flywheel lithium-electricity hybrid energy storage system adopting the power electronic transformer is constructed by adopting the flywheel lithium-electricity hybrid energy storage power supply unit, so that harmonic suppression and reactive compensation devices do not need to be configured, and related primary and secondary equipment for relay protection required by a power frequency transformer also does not need to be configured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is the utility model discloses embodiment in the embodiment of the structure diagram of flywheel lithium electricity hybrid energy storage system.
Detailed Description
The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The embodiment of the utility model provides a flywheel lithium electricity hybrid energy storage system, as shown in figure 1, include: the station-service power supply unit 1, the flywheel lithium electricity hybrid energy storage power electronic voltage transformation unit 2 and the flywheel lithium electricity hybrid energy storage power supply unit 3 are arranged, one end of the flywheel lithium electricity hybrid energy storage power electronic voltage transformation unit 2 is connected with a station-service bus of the station-service power supply unit 1, and the other end of the flywheel lithium electricity hybrid energy storage power electronic voltage transformation unit 2 is connected with the flywheel lithium electricity hybrid energy storage power supply unit 3. Wherein the service bus is not shown in fig. 1.
In a specific embodiment, each thermal power generating unit is provided with a set of plant power supply units 1. When the number of the thermal power generating units is changed, the number of the station service power supply units 1 is also changed adaptively. In the embodiment of the present invention, only one set of service power supply unit 1 is taken as an example for explanation.
The embodiment of the utility model provides an in, flywheel lithium electricity hybrid energy storage power supply unit 3 inserts thermal power generating unit through flywheel lithium electricity hybrid energy storage power electronics voltage transformation unit 2, supplementary thermal power peak regulation, frequency modulation. Through adopting flywheel lithium electricity hybrid energy storage power supply unit 3, constructed a flywheel lithium electricity hybrid energy storage system who adopts power electronic transformer to need not to dispose harmonic suppression, reactive power compensator, also can not dispose the relevant primary, secondary equipment of relay protection that power frequency transformer needs.
Specifically, the flywheel lithium battery hybrid energy storage can assist the thermal power generating unit to participate in frequency modulation and peak shaving, and in the adjusting process, the flywheel energy storage rapid power adjusting capacity is applied to respond to a high-frequency power adjusting instruction. The characteristic that the storage electric quantity of the lithium battery is large is applied to respond to the medium-frequency and low-frequency power regulation instructions. Flywheel energy storage and lithium battery energy storage mutually support, increase thermal power unit frequency modulation and peak shaving ability, also can prolong energy storage system life.
In one embodiment, the station power supply unit 1 includes: the high-voltage substation, a plurality of high-voltage substation branch circuit breakers, multistage station-used generating line and a plurality of circuit breaker that is incorporated into the power networks, wherein, the high-voltage substation that becomes in the high-voltage substation side is connected to the generator export, the low-voltage substation side of high-voltage substation divide into a plurality of branches, every station-used generating line all is connected to a branch of high-voltage substation side through a high-voltage substation branch circuit breaker, every station-used generating line all links to each other with the lithium cell power electronic transformer among every set of flywheel lithium electricity hybrid energy storage power electronic voltage transformation unit through a circuit breaker that is incorporated into the power networks, every station-used generating line still links to each other with the flywheel power electronic transformer among every set of flywheel lithium electricity hybrid energy storage power electronic voltage transformation unit through a circuit breaker that is incorporated into the power networks simultaneously.
In one embodiment, in the power system, the high voltage transformer generally selects a double winding double high voltage transformer, i.e. the low voltage side of the high voltage transformer is divided into A, B branches. In the embodiment of the present invention, the high plant is described by taking the double-winding double-high plant shown in fig. 1 as an example. When the high-voltage substation 1-1 is determined as a double-winding double-split winding high-voltage substation, the number of the service buses is correspondingly determined, and each branch on the low-voltage side of the high-voltage substation 1-1 corresponds to one section of the service bus. Specifically, a branch A at the low-voltage side of the high-voltage substation 1-1 is correspondingly connected with a section of bus 1-4 used by the plant with 6kVA, and a branch B at the low-voltage side of the high-voltage substation 1-1 is correspondingly connected with a section of bus 1-5 used by the plant with 6 kVB. Furthermore, each branch of the low-voltage side of the high plant transformer 1-1 is also provided with a high plant transformer branch breaker. And each section of factory bus is also provided with two grid-connected circuit breakers.
Specifically, as shown in fig. 1, the high voltage side of the high plant transformer 1-1 is connected to the outlet of the generator, the low voltage side is divided into A, B two sections, the plant-used 6kVA section bus 1-4 is connected to the high plant transformer 1-1 low voltage side a branch through the high plant transformer a branch breaker 1-2, and the plant-used 6kVB section bus 1-5 is connected to the high plant transformer 1-1 low voltage side B branch through the high plant transformer B branch breaker 1-3. The 6kVA section bus 1-4 for the plant is connected with the flywheel lithium battery hybrid energy storage power electronic transformation unit 2 through the A set of lithium battery energy storage grid-connected circuit breakers 1-6 and the A set of flywheel energy storage grid-connected circuit breakers 1-7, and the 6kVB section bus 1-5 for the plant is connected with the flywheel lithium battery hybrid energy storage power electronic transformation unit 2 through the B set of lithium battery energy storage grid-connected circuit breakers 1-8 and the B set of flywheel energy storage grid-connected circuit breakers 1-9.
In one embodiment, the flywheel lithium-ion hybrid energy storage power electronic transformation unit 2 includes: multiple lithium battery power electronic transformers and multiple flywheel power electronic transformers. The high-voltage side of each lithium battery power electronic transformer and the high-voltage side of each flywheel power electronic transformer are connected with the same service bus in the service power supply unit; the low-voltage side of each lithium battery power electronic transformer and the low-voltage side of each flywheel power electronic transformer 22 are both connected with the flywheel lithium battery hybrid energy storage power supply unit 3.
In an embodiment, as shown in fig. 1, each section of the service bus is connected to a set of lithium battery power electronic transformer and a set of flywheel power electronic transformer, which are only used as an example and not limited thereto. Because the factory bus is provided with A, B two sections, the flywheel lithium battery hybrid energy storage power electronic transformation unit 2 also needs to be provided with two sets of lithium battery power electronic transformers and two sets of flywheel power electronic transformers. The embodiment of the utility model provides an in, flywheel lithium electricity hybrid energy storage power electronics voltage transformation unit 2 includes A set lithium cell power electronics transformer 21, A set flywheel power electronics transformer 22, B set lithium cell power electronics transformer 23 and B set flywheel power electronics transformer 24.
In the embodiment of the present invention, as shown in fig. 1, the a set of lithium battery power electronic transformer 21 includes a set of lithium battery high-voltage side converter 2-1, a set of lithium battery high-voltage side filter capacitor 2-2, a set of lithium battery high-frequency DC-DC transformer 2-3, a set of lithium battery low-voltage side filter capacitor 2-4, and a set of lithium battery low-voltage side converter 2-5. The AC side of a set of high-voltage side converter 2-1 of the lithium battery is connected with a station-used 6kVA section bus 1-4 through a set of lithium battery energy storage grid-connected circuit breaker 1-6, the high-voltage side of a set of high-frequency DC-DC transformer 2-3 of the lithium battery is connected with the DC side of a set of high-voltage side converter 2-1 of the lithium battery through a set of high-voltage side filter capacitor 2-2 of the lithium battery, and the DC side of a set of low-voltage side converter 2-5 of the lithium battery is connected with the low-voltage side of a set of high-frequency DC-DC transformer 2-3 of the lithium battery through a set of low-voltage side filter capacitor 2-4 of the lithium battery.
Further, as shown in fig. 1, the a-pack flywheel power electronic transformer 22 includes: the system comprises a flywheel high-voltage side converter A2-6, a flywheel high-voltage side filter capacitor A2-7, a flywheel high-frequency DC-DC transformer A2-8, a flywheel low-voltage side filter capacitor A2-9 and a flywheel low-voltage side converter A2-10. The alternating current side of the A set of flywheel high-voltage side converters 2-6 is connected with a station-use 6kVA section bus 1-4 through the A set of flywheel energy storage grid-connected circuit breakers 1-7, the high voltage side of the A set of flywheel high-frequency DC-DC transformer 2-8 is connected with the direct current side of the A set of flywheel high-voltage side converters 2-6 through the A set of flywheel high-voltage side filter capacitors 2-7, and the direct current side of the A set of flywheel low-voltage side converters 2-10 is connected with the low voltage side of the A set of flywheel high-frequency DC-DC transformer 2-8 through the A set of flywheel low-voltage side filter capacitors 2-9.
Further, as shown in fig. 1, the B-set lithium battery power electronic transformer 23 includes: the system comprises a battery B set, a lithium battery high-voltage side converter 2-11, a lithium battery B set high-voltage side filter capacitor 2-12, a lithium battery B set high-frequency DC-DC transformer 2-13, a lithium battery B set low-voltage side filter capacitor 2-14 and a lithium battery B set low-voltage side converter 2-15. The high-frequency DC-DC converter comprises a B set of lithium battery high-voltage side converter 2-11, a B set of lithium battery high-frequency DC-DC transformer 2-13, a B set of lithium battery low-voltage side converter 2-15 and a B set of lithium battery high-frequency DC-DC transformer 2-13, wherein the alternating current side of the B set of lithium battery high-voltage side converter 2-11 is connected with a station-use 6kVB section bus 1-5 through a B set of lithium battery energy storage grid-connected circuit breaker 1-8, the high-voltage side of the B set of lithium battery high-frequency DC-DC transformer 2-11 is connected with the direct current side of the B set of lithium battery high-voltage side converter 2-12, and the direct current side of the B set of lithium battery low-voltage side converter 2-15 is connected with the low-voltage side of the B set of lithium battery high-frequency DC-DC transformer 2-13 through a B set of lithium battery low-voltage side filter capacitor 2-14.
Further, as shown in fig. 1, the B-set flywheel power electronic transformer 24 includes: the system comprises a B set of flywheel high-voltage side converter 2-16, a B set of flywheel high-voltage side filter capacitor 2-17, a B set of flywheel high-frequency DC-DC transformer 2-18, a B set of flywheel low-voltage side filter capacitor 2-19 and a B set of flywheel low-voltage side converter 2-20. The high-voltage side of the B set of flywheel high-voltage side converter 2-16 is connected with a station-use 6kVB section bus 1-5 through a B set of flywheel energy storage grid-connected circuit breaker 1-9, the high-voltage side of the B set of flywheel high-frequency DC-DC transformer 2-18 is connected with the direct-current side of the A set of flywheel high-voltage side converter 2-6 through a B set of flywheel high-voltage side filter capacitor 2-17, and the direct-current side of the B set of flywheel low-voltage side converter 2-20 is connected with the low-voltage side of the B set of flywheel high-frequency DC-DC transformer 2-18 through a B set of flywheel low-voltage side filter capacitor 2-19.
Furthermore, the converter in the flywheel lithium-battery hybrid energy storage power electronic transformation unit 2 is controllable in height, flexible in voltage and current control mode, good in compatibility, good in fault isolation function, capable of achieving unit power factor operation or operation according to thermal power regulation requirements and given power factors, and more suitable for frequency modulation and peak regulation working conditions of hybrid energy storage auxiliary thermal power generating units.
Further, by adopting the A set of lithium battery high-voltage side filter capacitor 2-2, the A set of lithium battery low-voltage side filter capacitor 2-4, the A set of flywheel high-voltage side filter capacitor 2-7, the A set of flywheel low-voltage side filter capacitor 2-9, the B set of lithium battery high-voltage side filter capacitor 2-12, the B set of lithium battery low-voltage side filter capacitor 2-14, the B set of flywheel high-voltage side filter capacitor 2-17 and the B set of flywheel low-voltage side filter capacitor 2-19, the functions of reactive Power compensation and alternating current higher harmonic suppression can be realized in a Power Electronic Transformer (PET).
Furthermore, the PET is composed of a current converter, a high-frequency DC-DC transformer and a filter capacitor, has alternating current higher harmonic suppression and reactive compensation capabilities, can realize fault isolation between ports, is flexible in control mode, and is suitable for application in the aspects of enriching system functions, improving system performance and the like. Because the high-frequency DC-DC transformer is adopted, the occupied area is greatly reduced compared with that of a power frequency transformer, primary and secondary equipment related to relay protection required by the power frequency transformer can be omitted, and the frequency modulation and peak shaving working conditions of the hybrid energy storage auxiliary thermal power generating unit are more suitable.
Further, the set A of lithium battery high-frequency DC-DC transformer 2-3, the set A of flywheel high-frequency DC-DC transformer 2-8, the set B of lithium battery high-frequency DC-DC transformer 2-13 and the set B of flywheel high-frequency DC-DC transformer 2-18 have a rated frequency of 10kHz, and voltage change is realized through frequency change. The transformer has an electrical isolation function, is smaller than an iron core required by a power frequency transformer, greatly reduces the occupied area, has higher relative power density, and can be provided with relay protection related primary and secondary equipment required by the power frequency transformer.
In an embodiment, the flywheel lithium battery hybrid energy storage power supply unit 3 includes: the system comprises a plurality of lithium battery energy storage and power supply units and a plurality of flywheel energy storage and power supply units, wherein the lithium battery energy storage and power supply units are arranged in one-to-one correspondence with lithium battery power electronic transformers; each lithium battery energy storage power supply unit is connected with the low-voltage end of the corresponding lithium battery power electronic transformer; each set of flywheel energy storage power supply unit is connected with the low-voltage end of the corresponding flywheel power electronic transformer.
In one embodiment, as shown in fig. 1, since the lithium battery power electronic transformer includes A, B sets, the flywheel power electronic transformer also includes A, B sets. Therefore, the flywheel lithium battery hybrid energy storage power supply unit 3 includes a set of lithium battery energy storage power supply units 31, a set of flywheel energy storage power supply units 32, a set of lithium battery energy storage power supply units 33 and a set of flywheel energy storage power supply units 34.
In the embodiment of the present invention, as shown in fig. 1, the a set of lithium battery energy storage power supply unit 31 includes a set of lithium battery energy storage isolating switch 3-1, a set of lithium battery energy storage direct-exchange current device 3-2, and a set of lithium battery energy storage device 3-3, wherein the a set of lithium battery energy storage direct-exchange current device 3-2 ac side is connected to the a set of lithium battery low voltage side current converter 2-5 ac side through the a set of lithium battery energy storage isolating switch 3-1, and the a set of lithium battery energy storage direct-exchange current device 3-2 dc side is connected to the a set of lithium battery energy storage device 3-3.
Further, as shown in fig. 1, the set a of flywheel energy storage power supply units 32 includes: a set of flywheel energy storage isolating switch 3-4, A set of flywheel energy storage AC-AC current device 3-5 and A set of flywheel energy storage device 3-6. The alternating current output side of the flywheel energy storage AC-AC converter set A3-5 is connected with the alternating current side of the flywheel low-voltage side current converter set A2-10 through a flywheel energy storage isolating switch set A3-4, and the alternating current inflow side of the flywheel energy storage AC-AC converter set A3-5 is connected with a flywheel energy storage device set A3-6.
Further, as shown in fig. 1, the B-set lithium battery energy storage and power supply unit 33 includes B-set lithium battery energy storage and isolation switches 3-7, B-set lithium battery energy storage and direct-exchange converters 3-8, and B-set lithium battery energy storage devices 3-9, wherein the alternating current side of the B-set lithium battery energy storage and direct-exchange converters 3-8 is connected with the alternating current side of the B-set lithium battery low-voltage side current converter 2-15 through the B-set lithium battery energy storage and isolation switches 3-7, and the direct current side of the B-set lithium battery energy storage and direct-exchange converters 3-8 is connected with the B-set lithium battery energy storage devices 3-9.
Further, as shown in fig. 1, the set B flywheel energy storage power supply unit 34 includes: 3-10 parts of B sets of flywheel energy storage isolating switches, 3-11 parts of B sets of flywheel energy storage AC-AC converters and 3-12 parts of B sets of flywheel energy storage devices. The alternating current output side of the B set of flywheel energy storage AC-AC converter 3-11 is connected with the alternating current side of the B set of flywheel low-voltage side converter 2-20 through the B set of flywheel energy storage isolating switch 3-10, and the alternating current inflow side of the B set of flywheel energy storage AC-AC converter 3-11 is connected with the B set of flywheel energy storage device 3-12.
Furthermore, the set A of lithium battery energy storage devices 3-3, the set A of flywheel energy storage devices 3-6, the set B of lithium battery energy storage devices 3-9 and the set B of flywheel energy storage devices 3-12 can assist the thermal power generating unit to participate in frequency modulation and peak shaving, and in the adjusting process, the high-frequency power adjusting instruction is responded by applying the quick power adjusting capability of the set A of flywheel energy storage devices 3-6 and the set B of flywheel energy storage devices 3-12. The characteristic that the stored electric quantity of the energy storage devices 3-3 of the lithium batteries A and the energy storage devices 3-9 of the lithium batteries B is large is applied, and medium-frequency and low-frequency power adjustment instructions are responded. Flywheel energy storage and lithium battery energy storage mutually support, increase thermal power unit frequency modulation and peak shaving ability, also can prolong energy storage system life.
Further, the utility model discloses at A set lithium cell energy storage directly-exchange flow ware 3-2, A set flywheel energy storage interchange-exchange flow ware 3-5, B set lithium cell energy storage directly-exchange flow ware 3-8, B set flywheel energy storage interchange-exchange flow ware 3-11, the high-power high frequency IGBT components and parts of adoption can realize the unit power factor operation or according to the real-time power regulation demand of power consumption load, operate according to given power factor. The maximum short-circuit current which can be provided does not exceed 1.5 times of the rated current, and the protection and judgment logic is simple and efficient.
Further, the power supply reliability can be improved by configuring the set A of lithium battery energy storage direct-exchange current device 3-2, the set A of lithium battery energy storage device 3-3, the set A of flywheel energy storage alternating-current device 3-5, the set B of lithium battery energy storage device 3-9, the set B of lithium battery energy storage direct-exchange current device 3-8, the set B of lithium battery energy storage device 3-9, the set B of flywheel energy storage alternating-current device 3-11 and the set B of flywheel energy storage device 3-12, and the A, B sets of hybrid energy storage units are mutually backup, so that the backup units can be seamlessly switched in after a single flywheel energy storage unit or a lithium battery energy storage unit is damaged, and the reliable power supply of the flywheel lithium battery hybrid energy storage power supply unit is maintained.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (8)
1. The utility model provides a flywheel lithium electricity hybrid energy storage system which characterized in that includes: a plant power supply unit, a flywheel lithium battery hybrid energy storage power electronic voltage transformation unit and a flywheel lithium battery hybrid energy storage power supply unit, wherein,
the one end of flywheel lithium electricity hybrid energy storage power electronics voltage transformation unit with the mill of mill power supply unit is connected, the other end of flywheel lithium electricity hybrid energy storage power electronics voltage transformation unit with flywheel lithium electricity hybrid energy storage power supply unit connects.
2. The flywheel lithium-ion hybrid energy storage system according to claim 1, wherein the flywheel lithium-ion hybrid energy storage power electronic transformation unit comprises: a plurality of lithium battery power electronic transformers and a plurality of flywheel power electronic transformers, wherein,
the high-voltage side of each lithium battery power electronic transformer and the high-voltage side of each flywheel power electronic transformer are connected with the same service bus in the service power supply unit;
every lithium cell power electronic transformer's low pressure side and every flywheel power electronic transformer low pressure side all with flywheel lithium electricity hybrid energy storage power supply unit connects.
3. The flywheel lithium battery hybrid energy storage system of claim 2, wherein the lithium battery power electronic transformer comprises: a lithium battery high-voltage side converter, a lithium battery high-voltage side filter capacitor, a lithium battery high-frequency DC-DC transformer, a lithium battery low-voltage side filter capacitor and a lithium battery low-voltage side converter,
the alternating current side of the lithium battery high-voltage side converter is connected with the station bus, the high-voltage side of the lithium battery high-frequency DC-DC transformer is connected with the direct current side of the lithium battery high-voltage side converter through the lithium battery high-voltage side filter capacitor, and the direct current side of the lithium battery low-voltage side converter is connected with the low-voltage side of the lithium battery high-frequency DC-DC transformer through the lithium battery low-voltage side filter capacitor.
4. The flywheel lithium battery hybrid energy storage system of claim 3, wherein the flywheel power electronic transformer comprises: a flywheel high-voltage side converter, a flywheel high-voltage side filter capacitor, a flywheel high-frequency DC-DC transformer, a flywheel low-voltage side filter capacitor and a flywheel low-voltage side converter,
the alternating current side of the flywheel high-voltage side converter is connected with the station bus, the high-voltage side of the flywheel high-frequency DC-DC transformer is connected with the direct current side of the flywheel high-voltage side converter through the flywheel high-voltage side filter capacitor, and the direct current side of the flywheel low-voltage side converter is connected with the low-voltage side of the flywheel high-frequency DC-DC transformer through the flywheel low-voltage side filter capacitor.
5. The lithium flywheel hybrid energy storage system according to claim 2, wherein the plant power supply unit comprises: a high-plant substation, a plurality of high-plant substation branch circuit breakers, a plurality of sections of plant buses and a plurality of grid-connected circuit breakers, wherein,
the high-voltage plant becomes high-voltage side and is connected to the generator export, high-voltage plant becomes low-voltage side and divide into a plurality of branches, every section the mill is with the generating line all through one high-voltage plant becomes branch circuit breaker and is connected to a branch of high-voltage plant becomes low-voltage side, every section the mill is with the generating line all through one in the circuit breaker of being incorporated into the power networks and every set among the mixed energy storage power electronic voltage transformation unit of flywheel lithium electricity lithium battery power electronic transformer links to each other, every section simultaneously the mill is with the generating line still through one in the circuit breaker of being incorporated into the power networks and every set among the mixed energy storage power electronic voltage transformation unit of flywheel lithium electricity flywheel power electronic transformer links to each other.
6. The flywheel lithium-ion hybrid energy storage system according to claim 4, wherein the flywheel lithium-ion hybrid energy storage power supply unit comprises: a plurality of lithium battery energy storage power supply units and a plurality of flywheel energy storage power supply units, wherein,
the lithium battery energy storage power supply units and the lithium battery power electronic transformers are arranged in a one-to-one correspondence manner, and the flywheel energy storage power supply units and the flywheel power electronic transformers are arranged in a one-to-one correspondence manner;
each set of lithium battery energy storage power supply unit is connected with the corresponding low-voltage end of the lithium battery power electronic transformer; each set of flywheel energy storage power supply unit is connected with the low-voltage end of the corresponding flywheel power electronic transformer.
7. The flywheel lithium battery hybrid energy storage system according to claim 6, wherein the lithium battery energy storage and power supply unit comprises: a lithium battery energy storage isolating switch, a lithium battery energy storage DC-AC converter and a lithium battery energy storage device, wherein,
the alternating current side of the lithium battery energy storage direct-exchange converter is connected with the alternating current side of the lithium battery low-voltage side converter through the lithium battery energy storage isolating switch, and the direct current side of the lithium battery energy storage direct-exchange converter is connected with the lithium battery energy storage device.
8. The flywheel lithium-ion battery hybrid energy storage system according to claim 6, wherein the flywheel energy storage power supply unit comprises: a flywheel energy storage isolating switch, a flywheel energy storage AC-AC converter and a flywheel energy storage device, wherein,
the alternating current sending side of the flywheel energy storage AC-AC converter is connected with the alternating current side of the flywheel low-voltage side converter through the flywheel energy storage isolating switch, and the alternating current flowing side of the flywheel energy storage AC-AC converter is connected with the flywheel energy storage device.
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