CN113922495A - Energy storage power station and black start method - Google Patents
Energy storage power station and black start method Download PDFInfo
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- CN113922495A CN113922495A CN202111193920.6A CN202111193920A CN113922495A CN 113922495 A CN113922495 A CN 113922495A CN 202111193920 A CN202111193920 A CN 202111193920A CN 113922495 A CN113922495 A CN 113922495A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 305
- 241001672018 Cercomela melanura Species 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000005284 excitation Effects 0.000 claims abstract description 21
- 238000010586 diagram Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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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
- H02J11/00—Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
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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
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/02—Details of the control
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Abstract
The embodiment of the invention discloses an energy storage power station and a black start method. This energy storage power station includes: the system comprises a generator, a generator excitation, a service bus, a service load and an energy storage system; the station bus is used for supplying power to station loads and generator excitation; the energy storage system comprises a first energy storage group and a second energy storage group, and both the first energy storage group and the second energy storage group are internally provided with a current transformer; and when the system is started in black, the first energy storage group is used for dragging the generator to start in a variable frequency mode, and the second energy storage group is used for supplying power to the station bus. According to the technical scheme of the embodiment of the invention, the energy storage systems in the energy storage power station are grouped and respectively used for dragging the variable frequency starting of the generator and supplying power to the station bus without adding separate frequency converter equipment, so that the equipment investment and the energy loss in a line are reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of energy storage power stations, in particular to an energy storage power station and a black start method.
Background
In recent years, it has become a trend to support power plants with energy storage power stations to achieve black starts. The black start means that under the condition that the power plant is disconnected from an external power grid and the unit is completely shut down, the local power supply in the plant is completely utilized to supply power for the service power, so that the unit is automatically started and the power supply of the power grid is gradually recovered.
In the existing black start method of the energy storage support generator, a frequency converter is generally adopted to drive the generator to start, when the generator reaches a certain rotating speed, a prime motor is started, and the frequency converter and the prime motor jointly push the generator to operate. When the generator operates to the self-sustaining rotating speed, the frequency converter quits operation. After the generator reaches the rated rotating speed, the black start is successful. However, the existing method needs to use an additional frequency converter, so that the equipment investment is large and additional energy loss is generated.
Disclosure of Invention
The embodiment of the invention provides an energy storage power station and a black start method, which are used for reducing equipment investment and energy loss of black start.
In a first aspect, an embodiment of the present invention provides an energy storage power station, including:
the system comprises a generator, a generator excitation, a service bus and a service load; the station bus is used for supplying power to station loads and generator excitation;
the energy storage system comprises a first energy storage group and a second energy storage group, and converters are arranged in the first energy storage group and the second energy storage group; and when the system is started in black, the first energy storage group is used for dragging the generator to start in a variable frequency mode, and the second energy storage group is used for supplying power to the station bus.
Optionally, the grouping switch module is connected between the first energy storage group and the second energy storage group, and is configured to control connection or disconnection of the first energy storage group and the second energy storage group.
Optionally, the grouping switch module includes: and the first end of the first switch is electrically connected with the first energy storage group, and the second end of the first switch is electrically connected with the second energy storage group.
Optionally, the grouping switch module includes: the first end of the first switch is connected with the first end of the second switch, and then the first switch and the second switch are connected and are commonly electrically connected with the first energy storage set, the second end of the first switch is electrically connected with the second energy storage set, and the second end of the second switch is electrically connected with the generator.
Optionally, the first transformer is connected between the first energy storage group and the generator;
the second transformer is connected between the service bus and the service load;
the third transformer is connected between the service bus and the generator excitation.
In a second aspect, an embodiment of the present invention further provides a black-start method for an energy storage power station, where the black-start method includes: an energy storage dragging stage, an energy storage prime driving dragging stage and an energy storage quitting stage;
in the energy storage dragging stage, an energy storage system is divided into a first energy storage group and a second energy storage group, the first energy storage group is used for dragging a generator to start, and the second energy storage group is used for supplying power to a station bus;
in the energy storage prime mover dragging stage, a prime mover is put in, and the first energy storage group and the prime mover drag a generator to start;
in the energy storage exiting stage, the first energy storage group exits, and the prime motor drives the generator to start until the black start is finished.
Optionally, the first energy storage group outputs variable frequency voltage through a converter, and the variable frequency voltage is used for driving a generator to start in a variable frequency mode;
the second energy storage group outputs power frequency voltage through the converter.
Optionally, the black start method further includes: a grid-connected operation stage;
and in the grid-connected operation stage, the first energy storage group and the second energy storage group are connected in parallel and operate under the power frequency voltage through the converter.
Optionally, in a grid-connected operation stage, the first energy storage group and the second energy storage group both operate in a frequency modulation peak shaving mode.
Optionally, the energy storage power station includes a grouping switch module, the grouping switch module includes a first switch and a second switch, after a first end of the first switch and a first end of the second switch are connected, the first switch and the second switch are electrically connected to the first energy storage group together, a second end of the first switch and the second energy storage group are electrically connected, and a second end of the second switch and the generator are electrically connected;
correspondingly, in the energy storage dragging stage, the energy storage motive dragging stage and the energy storage quitting stage, the first switch is switched off, and the second switch is switched on;
and in the grid-connected operation stage, the first switch and the second switch are closed.
Optionally, the condition for exiting the first energy storage group includes: the generator reaches the rated speed.
The energy storage power station provided by the embodiment of the invention has the advantages that the energy storage systems are grouped, in the black starting process, the first energy storage group provides variable frequency voltage to drag the generator to start, and the second energy storage group provides constant frequency voltage to supply power to the service bus. Therefore, the embodiment of the invention can provide the variable-frequency starting function of the generator by utilizing the converter built in the energy storage system. However, in the prior art, the energy storage system directly supplies power to the service bus, and the frequency converter is used to convert the electric energy of the service bus into the electric energy required by the variable-frequency starting of the generator. Compared with the prior art, the embodiment of the invention reduces the equipment investment, thereby reducing the energy loss of the energy storage power station.
Drawings
Fig. 1 is a circuit structure diagram of an energy storage power station according to an embodiment of the present invention;
FIG. 2 is a circuit structure diagram of another energy storage power station provided in the embodiment of the invention;
FIG. 3 is a circuit structure diagram of another energy storage power station provided by the embodiment of the invention;
FIG. 4 is a circuit block diagram of another energy storage power station provided in the embodiment of the present invention;
FIG. 5 is a flowchart of a black-start method for an energy storage power station according to an embodiment of the present invention;
fig. 6 is a flowchart of a black-start method for an energy storage power station according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides an energy storage power station. Fig. 1 is a circuit structure diagram of an energy storage power station according to an embodiment of the present invention. As shown in fig. 1, an energy storage power station provided in an embodiment of the present invention includes: generator 10, generator excitation 20, service bus 30, service load 40 and energy storage system 50. The service bus 30 is used to supply power to the service load 40 and the generator exciter 20. The energy storage system 50 includes a first energy storage group 51 and a second energy storage group 52, and a current transformer is disposed in each of the first energy storage group 51 and the second energy storage group 52. During black start, the first energy storage group 51 is used for dragging the generator 10 to start in a variable frequency mode, and the second energy storage group 52 is used for supplying power to the service bus 30.
The generator 10 may be a synchronous generator, a single-phase generator, or a three-phase generator, and may be classified into a turbo generator, a hydro generator, a diesel generator, or a gasoline generator.
The generator excitation 20 is used for providing excitation current for the generator, the excitation current can be adjusted correspondingly according to the change of the load of the generator so as to maintain the voltage of the generator terminal as a fixed value, and in the case of a fault inside the generator, the excitation can be removed so as to reduce the fault loss degree.
The service bus 30 is a bus for transmitting power from the power plant and supplies power to the service load and the generator during operation. The service loads 40 may be service equipment of the power plant that consumes the electrical power required for the power generation process, and may include one type of service load, two types of service loads, and/or three types of service loads depending on the role of the service equipment in production and the degree of damage to human safety and equipment safety from a sudden interruption of power supply.
The energy storage system 50 is a system for storing electric energy, and may include a battery pack, a converter, and the like. Since the generated electric energy cannot be stored, the redundant electric energy is stored by providing the battery pack. Converters are electrical devices that can change the voltage, frequency, number of phases, and/or other quantities or characteristics of a power system, and may include rectifiers, inverters, ac converters, dc converters, and the like. Thus, the energy storage system 50 is capable of providing not only the variable frequency voltage required by the generator 10 during start-up, but also the constant frequency voltage required by the service bus 30 and the generator excitation 20.
Optionally, the energy storage power plant further comprises a prime mover (not shown in fig. 1) mechanically connected to the generator 10, in particular, mechanically connected to the rotor of the generator 10 via mechanical bearings, to drag the generator 10 to generate electrical energy. The prime mover is also called a power machine, and comprises all mechanical devices which utilize energy sources to generate motive power. The prime movers are classified according to the energy source to be used, and there are a thermal prime mover, a hydraulic prime mover, a wind prime mover, and the like.
Illustratively, the black-start method for the energy storage power station provided by the embodiment of the invention comprises an energy storage dragging stage, an energy storage motive dragging stage and an energy storage exiting stage. In the energy storage dragging stage, the energy storage system 50 is divided into a first energy storage group 51 and a second energy storage group 52, the first energy storage group 51 provides variable frequency voltage to drag the generator 10 to start, so that the rotating speed of the generator 10 gradually increases from 0, and the second energy storage group 52 provides constant frequency voltage to supply power to the station bus 30. When the rotation speed of the generator 10 reaches a certain value, the energy storage prime mover driving stage is entered, and the prime mover and the first energy storage group 51 are put into operation to drive the generator 10 to start. When the generator 10 reaches a certain rotating speed, the first energy storage group 51 is out of operation, the generator 10 is independently driven to operate only by the prime mover, and when the prime mover drives the generator 10 to operate and reach a normal working rotating speed, black start is completed, and the power plant can independently generate power.
Therefore, compared with the prior art, in the black starting process of the energy storage power station, frequency converter equipment does not need to be additionally arranged, and a part of energy storage groups directly provide frequency conversion starting, so that the investment of equipment is reduced, and the energy loss of the equipment is reduced.
In summary, in the energy storage power station provided in the embodiment of the present invention, the energy storage systems 50 are grouped, and in the black start process, the first energy storage group 51 provides a variable frequency voltage to drive the generator 10 to start, and the second energy storage group 52 provides a constant frequency voltage to supply power to the service bus 30. Therefore, the embodiment of the present invention can provide the variable frequency starting function of the generator by using the converter built in the energy storage system 50. However, in the prior art, the energy storage system 50 directly supplies power to the service bus 30, and the electric energy of the service bus 30 is converted into the electric energy required by the variable-frequency starting of the generator by means of the frequency converter. Compared with the prior art, the embodiment of the invention reduces the equipment investment, thereby reducing the energy loss of the energy storage power station.
With continuing reference to fig. 1, on the basis of the foregoing embodiment, optionally, the energy storage power station provided in the embodiment of the present invention further includes: and the grouping switch module 60 is connected between the first energy storage group 51 and the second energy storage group 52, and is used for controlling the connection or disconnection of the first energy storage group 51 and the second energy storage group 52.
The energy storage system 50 controls the connection mode of the first energy storage group 51 and the second energy storage group 52 through the grouping switch module 60. Illustratively, in the black start process, the grouping switch module 60 controls the first energy storage group 51 to be electrically connected with the generator 10 and disconnected from the service bus 30 to drag the generator 10 to start in a variable frequency manner until the black start is completed. Meanwhile, the grouping switch module 60 controls the second energy storage group 52 to be disconnected from the generator 10, electrically connected with the service bus 30, and used for supplying power to the service bus 30, and then the service bus 30 supplies power to the service load 40 and the generator excitation 20. When the generator normally runs in a grid-connected mode, the grouping switch module 60 controls the first energy storage group 51 and the second energy storage group 52 to be connected in parallel and electrically connected with the generator 10 and the service bus 30, on one hand, the first energy storage group 51 and the second energy storage group 52 provide constant-frequency voltage required by normal work for the generator 10, and on the other hand, the first energy storage group 51 and the second energy storage group 52 provide constant-frequency voltage for the service bus 30 to supply power and participate in services such as peak regulation and frequency modulation.
In the above embodiments, there are various ways of setting the grouping switch module 60, and some of them will be described below, but the present invention is not limited thereto.
Fig. 2 is a circuit structural diagram of another energy storage power station according to an embodiment of the present invention. Referring to fig. 2, in an embodiment of the present invention, optionally, the grouping switch module 60 in the energy storage power station provided in the embodiment of the present invention includes a first switch 61, a first end of the first switch 61 is electrically connected to the first energy storage group 51, and a second end of the first switch 61 is electrically connected to the second energy storage group 52.
The energy storage power station controls the connection or disconnection of the first energy storage group 51 and the second energy storage group 52 through the first switch 61, and the energy storage system 50 is divided into two groups, so that the first energy storage group 51 realizes the conversion of two working modes in the black starting process of the generator. In the black start process, the first switch 61 is turned off, so that the energy storage system 50 is divided into a first energy storage group 51 and a second energy storage group 52, wherein the first energy storage group 51 is utilized to perform the start operation of the traction generator 10, and the second energy storage group 52 is electrically connected to the service bus 30 to supply power to the service bus 30. After the power plant enters normal operation, in a grid-connected operation stage, the first switch 61 is closed, the first energy storage group 51 and the second energy storage group 52 operate at the working frequency of the power grid together and participate in frequency modulation and peak shaving services, and conversion between a frequency modulation starting mode of the dragging generator of the first energy storage group 51 and a frequency modulation peak shaving mode in grid-connected operation is achieved.
Fig. 3 is a circuit structural diagram of another energy storage power station according to an embodiment of the present invention. Referring to fig. 3, in an embodiment of the present invention, optionally, a group switch module 60 in the energy storage power station provided in the embodiment of the present invention includes: the first end of the first switch 61 and the first end of the second switch 62 are connected and then electrically connected to the first energy storage group 51, the second end of the first switch 61 is electrically connected to the second energy storage group 52, and the second end of the second switch 62 is electrically connected to the generator 10.
The grouping switch module 60 is provided with a first switch 61 and a second switch 62, respectively, which cooperate to control the connection or disconnection of the first energy storage group 51 and the second energy storage group 52. During the black start of the generator, the grouping switch module 60 controls the first switch 61 to be opened and the second switch 62 to be closed, so as to divide the energy storage system 50 into the first energy storage group 51 and the second energy storage group 52. The first energy storage group 51 is electrically connected with the generator 10 and is used for driving the generator 10 to complete variable frequency starting; the second energy storage bank 52 is electrically connected to the service bus 30 and provides a constant frequency voltage to power the service bus 30. After the power plant enters a normal working state, at this time, the whole working circuit is in a grid-connected operation stage, the grouping switch module 60 controls the first switch 61 to be closed and the second switch 62 to be closed, so that the first energy storage group 51 and the second energy storage group 52 are connected into the working circuit in parallel at the same time, both operate under the working frequency of the power grid, and participate in services such as frequency modulation and peak shaving at the same time.
In the above embodiments, the first energy storage group 51 may exit from operation by turning off the first switch 61, or by controlling the output voltage to be zero by the converter, and may be set as needed in practical applications, which is not limited in the present invention.
Fig. 4 is a circuit structural diagram of another energy storage power station according to an embodiment of the present invention. Referring to fig. 4, in an embodiment of the present invention, the energy storage system 50 may be divided into two groups, but not limited to, and may also be divided into multiple groups, for example: the energy storage system 50 may be divided into a first energy storage group 51, a second energy storage group 52 and a third energy storage group 53. Accordingly, the switches in the grouping switch module 60 may be provided in two, but not limited to, or in multiple, for example: the grouping switch module 60 may include a first switch 61, a second switch 62, and a third switch 63, a first terminal of the third switch 63 is electrically connected to the third energy storage bank 53, and a second terminal of the third switch 63 is electrically connected to the service bus 30. In the black start process, the first switch 61 and the second switch 62 may be closed, and the third switch 63 may be opened, so that the first energy storage group 51 and the second energy storage group 52 are connected in parallel and jointly responsible for dragging the generator 10 to start in a variable frequency manner, and the third energy storage group 53 is electrically connected to the service bus 30 to supply power to the service bus 30. Or in the black start process, the second switch 62 is closed, and the first switch 61 and the third switch 63 are disconnected, so that the first energy storage group 51 is responsible for dragging the generator 10 to start in a variable frequency manner, the second energy storage group 52 and the third energy storage group 53 are connected in parallel and then electrically connected with the service bus 30, and the service bus 30 is supplied with power together.
In the above embodiments, two energy storage groups and three energy storage groups are described, but the invention is not limited thereto. In practical application, the number of the energy storage groups and the number of the energy storage groups for variable-frequency starting of the generator can be flexibly adjusted according to requirements.
With continued reference to fig. 4, in an embodiment of the present invention, optionally, the energy storage power station further comprises: a first transformer 71, the first transformer 71 being connected between the first energy storage bank 51 and the generator 10; a second transformer 72, the second transformer 72 being connected between the service bus 30 and the service load 40; a third transformer 73, the third transformer 73 being connected between the service bus 30 and the generator excitation 20.
The first transformer 71 is connected between the first energy storage group 51 and the generator 10, and is used for converting the voltage output by the first energy storage group 51 into the voltage required by the operation of the generator 10, so as to provide for the normal operation of the generator 10. The second transformer 72 is connected between the service bus 30 and the service load 40, and is configured to convert the voltage provided by the second energy storage group 52 to the service bus 30 into a corresponding voltage required by each power grid operating device included in the service load 40, so as to meet an electrical energy requirement when each service load normally operates. The third transformer 73 is connected between the service bus 30 and the generator excitation 20, and is configured to convert a voltage provided by the second energy storage group 52 to the service bus 30 into a working voltage required by the generator excitation 20, so that the generator excitation 20 operates normally.
On the basis of the foregoing embodiments, optionally, the switching device adopted by the current transformer built in the first energy storage group and the second energy storage group includes at least one of a thyristor (SCR) and an Insulated Gate Bipolar Transistor (IGBT). Preferably, the switching devices of the built-in converter are all IGBTs, wherein, compared with the SCR, the IGBTs are fully-controlled devices, and the switching frequency is higher, so, compared with the SCR, the IGBTs have better sine wave simulation effect, smaller harmonic component and better power quality.
In the prior art, a switching device adopted by a frequency converter is generally an SCR (silicon controlled rectifier), the sine wave simulation effect is poor, the harmonic component is large, and the generator is easily damaged. The switch device adopted by the converter with the built-in energy storage group is generally an IGBT (insulated gate bipolar transistor), the sine wave simulation effect is good, and the harmonic component is small. Therefore, the embodiment of the invention adopts the converter built in the energy storage group to replace the frequency converter, so that the use of the frequency converter is omitted, the effect of improving the quality of output electric energy is realized on the basis of reducing the equipment investment and the energy loss of the energy storage power station, and the damage to the generator is reduced.
The embodiment of the invention also provides a black start method of the energy storage power station, and the method is suitable for the energy storage power station provided by any embodiment of the invention. Fig. 5 is a flowchart of a black-start method of an energy storage power station according to an embodiment of the present invention. Referring to fig. 5, the black start method includes: an energy storage dragging stage, an energy storage prime dragging stage and an energy storage quitting stage.
And S110, in the energy storage dragging stage, dividing an energy storage system into a first energy storage group and a second energy storage group, wherein the first energy storage group is used for dragging a generator to start, and the second energy storage group is used for supplying power to a station bus.
And S120, in the energy storage prime mover dragging stage, a prime mover is put into the energy storage prime mover, and the first energy storage group and the prime mover drag the generator to start.
And S130, in the energy storage exiting stage, the first energy storage group exits from the prime mover to drive the motor to start until the black start is finished.
According to the black start method of the energy storage power station, the energy storage systems are grouped, in the black start process, the first energy storage group bears the work of driving the generator to start in a variable frequency mode, the second energy storage group provides constant-frequency voltage, and power is supplied to the station bus. Therefore, the embodiment of the invention can provide the variable-frequency starting function of the generator by utilizing the converter built in the energy storage system. However, in the prior art, the energy storage system directly supplies power to the service bus, and the frequency converter is used to convert the electric energy of the service bus into the electric energy required by the variable-frequency starting of the generator. Compared with the prior art, the embodiment of the invention reduces the equipment investment, thereby reducing the energy loss of the energy storage power station.
In an embodiment of the present invention, optionally, the first energy storage bank outputs a variable frequency voltage through the converter for the variable frequency drive generator to start, and the second energy storage bank outputs a power frequency voltage through the converter.
The generator is started in a variable frequency mode, and a first energy storage group is required to output variable frequency voltage; and the generator excitation and the service load normally run, and the second energy storage group is required to output power frequency voltage, wherein the power frequency voltage is generally voltage with the frequency of 50-60 Hz.
Fig. 6 is a flowchart of a black-start method for an energy storage power station according to another embodiment of the present invention. Referring to fig. 6, in an embodiment of the present invention, optionally, the black start method further includes a grid-connected operation phase. Specifically, the black start method comprises the following steps:
s210, in the energy storage dragging stage, an energy storage system is divided into a first energy storage group and a second energy storage group, the first energy storage group is used for dragging a generator to start, and the second energy storage group is used for supplying power to a station bus.
And S220, in the energy storage prime mover dragging stage, a prime mover is put into the energy storage prime mover, and the first energy storage group and the prime mover drag the generator to start.
And S230, in the energy storage exiting stage, the first energy storage group exits from the prime mover to drive the motor to start until the black start is finished.
And S240, in a grid-connected operation stage, the first energy storage group and the second energy storage group are connected in parallel and operate under a power frequency voltage through the converter.
Through S210-S240, the embodiment of the invention not only realizes the control of the first energy storage group and the second energy storage group in the black start process, but also realizes the control of the first energy storage group and the second energy storage group in the normal grid-connected operation process.
In an embodiment of the present invention, optionally, during the grid-connected operation phase, the first energy storage group and the second energy storage group are both operated in the frequency modulation peak shaving mode. Because the peak-valley difference of the power utilization in a certain area is large, the electric energy generated by a power plant is excessive and the energy is wasted in the low-valley period of the power utilization; and in the peak period of electricity utilization, the electric energy generated by the power plant is not enough to meet the electricity utilization requirement in a certain area. Therefore, the regulation capacity of the power grid can be enhanced and the consumption of renewable energy sources can be promoted by using the peak-shaving frequency-modulation service of the power system participated by the stored energy.
With reference to fig. 3, in an embodiment of the present invention, optionally, the grouping switch module 60 includes a first switch 61 and a second switch 62, after a first end of the first switch 61 and a first end of the second switch 62 are connected, they are electrically connected to the first energy storage group 51 together, a second end of the first switch 61 is electrically connected to the second energy storage group 52, and a second end of the second switch 62 is electrically connected to the generator 10; correspondingly, in the energy storage dragging stage, the energy storage motive dragging stage and the energy storage quitting stage, the first switch 61 is switched off, the second switch 62 is switched on, and in the grid-connected operation stage, the first switch 61 and the second switch 62 are both switched on.
Illustratively, in an energy storage dragging stage of a black start process, the grouping switch module 60 controls the first switch 61 to be switched off, the second switch 62 to be switched on, so as to divide the energy storage system 50 into the first energy storage group 51 and the second energy storage group 52, and the second energy storage group 52 is responsible for providing power frequency alternating current of 50/60Hz through a built-in converter, so as to supply power to the generator excitation 20 and the plant load 40; the first energy storage group 51 provides variable frequency voltage through a built-in converter, and is responsible for starting the variable frequency dragging generator 10. The first energy storage group 51 is electrically connected to the generator 10, and drags the rotation speed of the generator 10 to increase slowly. When the rotating speed of the generator 10 reaches a certain value, the energy storage prime mover dragging stage of black start is started. At this time, the grouping switch module 60 still controls the first switch 61 to be opened, and the second switch 62 to be closed, so as to start the prime mover, and drive the generator 10 to start together with the first energy storage group 51. When the generator 10 reaches a certain rotating speed, the energy storage exiting stage is entered, that is, the first energy storage group 51 exits from operation, the prime mover independently drives the generator 10 to operate, and when the rotating speed of the generator 10 reaches a normal working rotating speed, the black start is completed, and the power grid can independently generate power. In the subsequent grid-connected operation stage, the generator 10 is normally in grid-connected operation, the grouping switch module 60 controls the first switch 61 to be closed, the second switch 62 is also closed, and the first energy storage group 51 and the second energy storage group 52 both operate at the working frequency and participate in the peak-and-frequency modulation service at the same time. The working circuit is arranged, the on and off of each switch is controlled by the grouping switch module 60, so that the first energy storage group 51 realizes the switching between the frequency conversion starting mode in the black starting stage and the peak and frequency modulation mode in the grid-connected operation stage, the investment of frequency converter equipment is reduced in the black starting process, and the energy loss is greatly reduced.
In an embodiment of the present invention, optionally, the condition for exiting the first energy storage group includes: the generator reaches the rated speed. Specifically, the various stages of the black start process of the generator are divided according to the different rotation speeds of the generator. When the rotating speed of the generator is slowly increased from 0 to the rated rotating speed, the first energy storage group is out of operation, and the prime motor independently drives the rotating speed of the generator to continue to increase until the black start is completed. Before the rotating speed of the generator does not reach the rated rotating speed, the first energy storage group and the prime motor jointly drag the generator to start in a variable frequency mode.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (11)
1. An energy storage power plant, comprising:
the system comprises a generator, a generator excitation, a service bus and a service load; the service bus is used for supplying power to the service load and the generator in an excitation way;
the energy storage system comprises a first energy storage group and a second energy storage group, and a current transformer is arranged in each of the first energy storage group and the second energy storage group; and when the generator is started in a black state, the first energy storage group is used for dragging the generator to start in a variable frequency mode, and the second energy storage group is used for supplying power to the service bus.
2. The energy storage power station of claim 1 further comprising:
and the grouping switch module is connected between the first energy storage group and the second energy storage group and is used for controlling the connection or disconnection of the first energy storage group and the second energy storage group.
3. The energy storage power station of claim 2 wherein the group switch module comprises: and a first end of the first switch is electrically connected with the first energy storage group, and a second end of the first switch is electrically connected with the second energy storage group.
4. The energy storage power station of claim 2 wherein the group switch module comprises: the first end of the first switch is connected with the first end of the second switch, and then the first switch and the second switch are connected together and electrically connected with the first energy storage group, the second end of the first switch is electrically connected with the second energy storage group, and the second end of the second switch is electrically connected with the generator.
5. The energy storage power station of claim 1 further comprising:
a first transformer connected between the first energy storage bank and the generator;
a second transformer connected between the service bus and the service load;
a third transformer connected between the service bus and the generator excitation.
6. A black start method for an energy storage plant as claimed in claim 1, characterized in that it comprises: an energy storage dragging stage, an energy storage prime driving dragging stage and an energy storage quitting stage;
in the energy storage dragging stage, the energy storage system is divided into a first energy storage group and a second energy storage group, the first energy storage group is used for dragging the generator to start, and the second energy storage group is used for supplying power to the station bus;
in the energy storage prime mover dragging stage, a prime mover is put into use, and the first energy storage group and the prime mover drag the generator to start;
in the energy storage exiting stage, the first energy storage group exits, and the prime mover drags the generator to start until the black start is completed.
7. The black-start method according to claim 6, wherein the first energy storage group outputs a variable frequency voltage through the converter for driving the generator to start at a variable frequency;
and the second energy storage group outputs power frequency voltage through the converter.
8. The black start method of claim 6, further comprising: a grid-connected operation stage;
and in the grid-connected operation stage, the first energy storage group and the second energy storage group are connected in parallel and operate under the power frequency voltage through the converter.
9. The black-start method according to claim 8, wherein during the grid-tied operation phase, the first energy storage bank and the second energy storage bank are both operated in a frequency modulation peak shaving mode.
10. The black start method according to claim 8, wherein the energy storage power station comprises a grouping switch module, the grouping switch module comprises a first switch and a second switch, a first end of the first switch and a first end of the second switch are connected and then are electrically connected with the first energy storage group together, a second end of the first switch is electrically connected with the second energy storage group, and a second end of the second switch is electrically connected with the generator;
correspondingly, in the energy storage dragging stage, the energy storage motive dragging stage and the energy storage quitting stage, the first switch is opened, and the second switch is closed;
and in the grid-connected operation stage, the first switch and the second switch are both closed.
11. The black start method of claim 6, wherein the condition for the first energy storage bank to exit comprises: the generator reaches a rated speed.
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