CN111064191A - Black start method and device for urban power grid - Google Patents
Black start method and device for urban power grid Download PDFInfo
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- CN111064191A CN111064191A CN201911383169.9A CN201911383169A CN111064191A CN 111064191 A CN111064191 A CN 111064191A CN 201911383169 A CN201911383169 A CN 201911383169A CN 111064191 A CN111064191 A CN 111064191A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The application discloses a black start method and a black start device for an urban power grid. Wherein, the method comprises the following steps: determining a black start power supply of the urban power grid, wherein the black start power supply is a garbage power plant in the urban power grid; and controlling the urban power grid to recover power supply according to the black start power supply. The power recovery method and the power recovery device solve the technical problem that power recovery cannot be achieved after a large power failure accident occurs to the urban power grid due to the fact that a stable black start power supply is lacked at present.
Description
Technical Field
The application relates to the field of black start of urban power grids, in particular to a black start method and device of the urban power grids.
Background
Super large cities have high requirements for power supply reliability. However, the power grid fails inevitably, and the possibility of blacking the power grid due to major power failure is provided. Therefore, for a super-large city, an accident plan for dealing with the blackness of a power grid, namely a black start scheme, needs to be made.
The black start refers to a process of driving a unit without self-starting capability through a unit with self-starting capability in a large power grid after power failure due to failure, gradually enlarging power supply range and finally recovering power supply capability of the power grid. At present, the power supply can not be recovered after a large power failure accident of an urban power grid is caused due to the lack of a stable black start power supply.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the application provides a black start method and a black start device for an urban power grid, and the method and the device are used for at least solving the technical problem that power supply recovery cannot be realized after a major power failure accident occurs to the urban power grid due to the lack of a stable black start power supply at present.
According to an aspect of an embodiment of the present application, there is provided a black start method for an urban power grid, including: determining a black start power supply of the urban power grid, wherein the black start power supply is a garbage power plant in the urban power grid; and controlling the urban power grid to recover power supply according to the black start power supply.
Optionally, the black start power supply includes: the system comprises a first generator set and a second generator set, wherein under the condition that the urban power grid normally supplies power, the first generator set and the second generator set both normally operate to supply power to plant loads of the garbage power plant; and under the condition that the urban power grid is completely powered off, the second generator set stops running, and the first generator set normally runs to supply power for the plant load of the garbage power plant.
Optionally, controlling the urban power grid to recover power supply according to the black-start power supply includes: after the first generator set is controlled to operate for a first preset time, the first generator set is controlled to be connected to an urban power grid; and controlling to start the second generator set under the condition that the load of the first generator set is increased to the preset full load.
Optionally, after controlling to start the second generator set, the method further includes: when the rotating speed of the second generator set is increased to a preset rotating speed, controlling the second generator set to be connected to the urban power grid; and controlling the load of the second generator set to rise to the preset full load.
According to another aspect of the embodiments of the present application, there is also provided a black start device for an urban power grid, including: the system comprises a determining module, a judging module and a judging module, wherein the determining module is used for determining a black start power supply of the urban power grid, and the black start power supply is a garbage power plant in the urban power grid; and the control module is used for controlling the recovery of power supply of the urban power grid according to the black-start power supply.
Optionally, the black start power supply includes: the system comprises a first generator set and a second generator set, wherein under the condition that the urban power grid normally supplies power, the first generator set and the second generator set both normally operate to supply power to plant loads of the garbage power plant; and under the condition that the urban power grid is completely powered off, the second generator set stops running, and the first generator set normally runs to supply power for the plant load of the garbage power plant.
Optionally, the control module includes: the first control unit is used for controlling the first generator set to be connected to the urban power grid after controlling the first generator set to operate for a first preset time; and the second control unit is used for controlling the start of the second generator set under the condition that the load of the first generator set is increased to the preset full load.
Optionally, the control module further includes: the third control unit is used for controlling the second generator set to be connected to the urban power grid when the rotating speed of the second generator set is increased to a preset rotating speed; and the fourth control unit is used for controlling the load of the second generator set to rise to the preset full load.
According to another aspect of the embodiments of the present application, there is also provided a storage medium, where the storage medium includes a stored program, and when the program runs, the apparatus where the storage medium is located is controlled to execute the above black-start method for a municipal power grid.
According to another aspect of the embodiments of the present application, there is also provided a processor for executing a program stored in a memory, wherein the program executing performs the above black start method for a municipal power grid.
In the embodiment of the application, a black start power supply for determining the urban power grid is adopted, wherein the black start power supply is a garbage power plant in the urban power grid; according to the mode of controlling the recovery power supply of the urban power grid by the black start power supply, the garbage power plant in the urban power grid is used as the black start power supply of the urban power grid, and the black start power supply is used for controlling the recovery power supply of the urban power grid, so that the technical effect of ensuring the recovery power supply of the urban power grid after the urban power grid has a major power failure fault is realized, the technical problem that the recovery power supply cannot be realized after the urban power grid has a major power failure accident due to the lack of a stable black start power supply at present is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart of a black start method of an urban power grid according to an embodiment of the present application;
fig. 2 is a block diagram of a black start device of an urban power grid according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to an embodiment of the present application, there is provided an embodiment of a black start method for a city power grid, where it is noted that the steps illustrated in the flowchart of the drawings may be executed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be executed in an order different from that herein.
Fig. 1 is a flowchart of a black start method of an urban power grid according to an embodiment of the present application, and as shown in fig. 1, the method includes the following steps:
and S102, determining a black start power supply of the urban power grid, wherein the black start power supply is a garbage power plant in the urban power grid.
The black start scheme is formulated by first determining the black start power supply. The unit selected as the black start power supply of the super-large city has the following characteristics:
1) the power plant is provided with an independent power supply (generally a high-capacity diesel generator), all auxiliary machines (black start load) can be driven, the preparation time before the start of the unit is short, and the start and the grid connection of the unit are fast;
2) if the power plant does not have an independent power supply with a black start load, a control system of the power plant has a isolated network operation function;
3) the unit is little affected by resources and has stable output;
4) the annual running time of the unit is long, and the overhaul time is short.
TABLE 1 characteristics of each type of unit as black start power supply
From table 1, it can be seen that:
the coal-fired power plant is slow to start and large in service load. Generally not considered as a black start power supply. The wind and light type power plant is far away from a load center and does not have island operation capacity. The hydroelectric generating set is used in a dry water city, cannot guarantee water source supply and cannot be used as a main black start power supply. The main differences between gas and garbage power plants are: the operation time of the garbage power plant is long. The annual overhaul time of the garbage power plant is only a few days, and the annual overhaul time of the gas power plant exceeds 1 month. Therefore, the garbage power plant can provide a more stable and reliable power supply. Because the factory load of the garbage power plant is large, the configuration of a large-capacity diesel generator is not economical, and the best mode is to modify the garbage power plant into an island operation function. The garbage machine set has much smaller output than a coal-fired and gas-fired machine set, has small power shortage after being disconnected with a power grid, is relatively easy to control frequency, and has mature technology for improving the island operation function.
As a black start power supply for an oversized city, besides a conventional pumped storage and gas turbine set, a garbage power plant with island operation capacity should be considered according to local conditions. The fuel of the garbage power plant is stacked in a garbage pool and can be generally burnt for 5 to 7 days, so that the garbage power plant has good continuous power generation and output capacity.
And step S104, controlling the urban power grid to recover power supply according to the black start power supply.
Through the steps, the garbage power plant in the urban power grid is used as the black start power supply of the urban power grid, and the black start power supply is used for controlling the urban power grid to recover power supply, so that the technical effect that the urban power grid can recover power supply after a large power failure fault occurs in the urban power grid is achieved, and the stability of operation of the urban power grid is improved.
According to an alternative embodiment of the present application, the black start power supply includes: the system comprises a first generator set and a second generator set, wherein under the condition that the urban power grid normally supplies power, the first generator set and the second generator set both normally operate to supply power to plant loads of the garbage power plant; and under the condition that the urban power grid is completely powered off, the second generator set stops running, and the first generator set normally runs to supply power for the plant load of the garbage power plant.
The garbage power plant is provided with 2 generator sets, all the generator transformer set units are connected to boost voltage to a 110kV bus, and then the 110kV power grid is accessed through 2 loops of lines. The factory working power supply is led from the low-voltage sides of 1# and 2# main transformers and respectively connected to I, II section buses for 10kV factories, and the factory starting/standby power supply is led from the 110kV buses and is connected to 10kV factory standby section buses through 1 starting/standby transformer. When the garbage power plant normally operates, the factory load of the garbage power plant is 11500kW, the 1# and 2# generators supply power, and the firewood generator and the storage battery do not work. And after the power grid is completely black, the 1# generator carries all service loads, the 2# generator stops running, and the control system in the plant supports the isolated network running mode. The running power generator can be connected to the grid for power transmission according to the scheduling requirement at any time, and the power plant has black start capability. In the isolated network mode, the fuel is the same as the normal operation, and has no special requirement.
In some optional embodiments of the present application, step S104 may be implemented by: after the first generator set is controlled to operate for a first preset time, the first generator set is controlled to be connected to an urban power grid; and controlling to start the second generator set under the condition that the load of the first generator set is increased to the preset full load.
According to an optional embodiment of the present application, after controlling the start of the second generator set, the method further includes: when the rotating speed of the second generator set is increased to a preset rotating speed, controlling the second generator set to be connected to the urban power grid; and controlling the load of the second generator set to rise to the preset full load.
Starting black start under the condition that the urban power grid is completely black, connecting the 1# generator to the grid, wherein the full load time is 30 minutes after connecting the grid, and the output is 33 MW. Before black start, the factory load of the stopped 2# unit is in an operating state, if the 2# unit is started in a hot state, the time from starting to start, grid connection to full load is shortest, 30+ 60-90 minutes, and the output force is 33 MW.
TABLE 2 garbage power plant Black Start Process
Table 2 shows the whole process of the black start of the refuse power plant, starting from the isolated operation of the unit No. 1 until the unit No. 2 is connected to the grid and is increased to the full load, which takes 123 minutes. The first preset time is 3 minutes, the preset full load is 33MW, and the preset rotating speed is 3000 r/min.
Fig. 2 is a block diagram of a black start device of a city power grid according to an embodiment of the present application, and as shown in fig. 2, the device includes:
the determining module 20 is configured to determine a black start power source of the urban power grid, where the black start power source is a garbage power plant located in the urban power grid.
And the control module 22 is used for controlling the recovery of power supply of the urban power grid according to the black-start power supply.
According to an alternative embodiment of the present application, the black start power supply includes: the system comprises a first generator set and a second generator set, wherein under the condition that the urban power grid normally supplies power, the first generator set and the second generator set both normally operate to supply power to plant loads of the garbage power plant; and under the condition that the urban power grid is completely powered off, the second generator set stops running, and the first generator set normally runs to supply power for the plant load of the garbage power plant.
In some optional embodiments of the present application, the control module 22 includes: the first control unit is used for controlling the first generator set to be connected to the urban power grid after controlling the first generator set to operate for a first preset time; and the second control unit is used for controlling the start of the second generator set under the condition that the load of the first generator set is increased to the preset full load.
According to an alternative embodiment of the present application, the control module 22 further comprises: the third control unit is used for controlling the second generator set to be connected to the urban power grid when the rotating speed of the second generator set is increased to a preset rotating speed; and the fourth control unit is used for controlling the load of the second generator set to rise to the preset full load.
It should be noted that, reference may be made to the description related to the embodiment shown in fig. 1 for a preferred implementation of the embodiment shown in fig. 2, and details are not described here again.
The embodiment of the application also provides a storage medium, wherein the storage medium comprises a stored program, and when the program runs, the device where the storage medium is located is controlled to execute the black-start method of the urban power grid.
The storage medium stores a program for executing the following functions: determining a black start power supply of the urban power grid, wherein the black start power supply is a garbage power plant in the urban power grid; and controlling the urban power grid to recover power supply according to the black start power supply.
The embodiment of the present application further provides a processor, where the processor is configured to run a program stored in a memory, where the program is run to perform the above black-start method for a municipal power grid.
The processor is used for running a program for executing the following functions: determining a black start power supply of the urban power grid, wherein the black start power supply is a garbage power plant in the urban power grid; and controlling the urban power grid to recover power supply according to the black start power supply.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a Read Only Memory (ROM), a random access Memory (RBJDLM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (10)
1. A black start method of an urban power grid is characterized by comprising the following steps:
determining a black start power supply of an urban power grid, wherein the black start power supply is a garbage power plant in the urban power grid;
and controlling the urban power grid to recover power supply according to the black start power supply.
2. The method of claim 1, wherein the black start power supply comprises: a first generator set and a second generator set, wherein,
under the condition that the urban power grid normally supplies power, the first generator set and the second generator set both normally operate to supply power to the service load of the garbage power plant;
and under the condition that the urban power grid is completely powered off, the second generator set stops running, and the first generator set runs normally to supply power for the service load of the garbage power plant.
3. The method of claim 2, wherein controlling the urban power grid to resume power supply according to the black-start power supply comprises:
after the first generator set is controlled to operate for a first preset time, controlling the first generator set to be connected to the urban power grid;
and controlling to start the second generator set under the condition that the load of the first generator set is increased to a preset full load.
4. The method of claim 3, wherein after controlling starting the second generator set, the method further comprises:
when the rotating speed of the second generator set is increased to a preset rotating speed, controlling the second generator set to be connected to the urban power grid;
and controlling the load of the second generator set to rise to the preset full load.
5. A black start device of an urban power grid is characterized by comprising:
the device comprises a determining module, a judging module and a judging module, wherein the determining module is used for determining a black start power supply of the urban power grid, and the black start power supply is a garbage power plant in the urban power grid;
and the control module is used for controlling the urban power grid to recover power supply according to the black-start power supply.
6. The apparatus of claim 5, wherein the black start power supply comprises: a first generator set and a second generator set, wherein,
under the condition that the urban power grid normally supplies power, the first generator set and the second generator set both normally operate to supply power to the service load of the garbage power plant;
and under the condition that the urban power grid is completely powered off, the second generator set stops running, and the first generator set runs normally to supply power for the service load of the garbage power plant.
7. The apparatus of claim 6, wherein the control module comprises:
the first control unit is used for controlling the first generator set to be connected to the urban power grid after controlling the first generator set to operate for a first preset time;
and the second control unit is used for controlling the starting of the second generator set under the condition that the load of the first generator set is increased to a preset full load.
8. The apparatus of claim 7, wherein the control module further comprises:
the third control unit is used for controlling the second generator set to be connected to the urban power grid when the rotating speed of the second generator set is increased to a preset rotating speed;
and the fourth control unit is used for controlling the load of the second generator set to rise to the preset full load.
9. A storage medium, characterized in that the storage medium comprises a stored program, wherein when the program runs, a device in which the storage medium is located is controlled to execute the black start method of the urban power grid according to any one of claims 1 to 4.
10. A processor, characterized in that the processor is configured to run a program stored in a memory, wherein the program is configured to execute the black start method of the urban power grid according to any one of claims 1 to 4 when running.
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Application publication date: 20200424 |
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