CN114285035B - Device and method for preventing power supply of station service system of power plant from being connected in series - Google Patents
Device and method for preventing power supply of station service system of power plant from being connected in series Download PDFInfo
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- CN114285035B CN114285035B CN202111661420.0A CN202111661420A CN114285035B CN 114285035 B CN114285035 B CN 114285035B CN 202111661420 A CN202111661420 A CN 202111661420A CN 114285035 B CN114285035 B CN 114285035B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
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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
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- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
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Abstract
The invention belongs to the field of power control and regulation of power plants, and discloses a device and a method for preventing a power supply of a power station service system of a power plant from being connected in series, wherein the device comprises the steps of obtaining high-voltage side voltage of the power station and high-voltage side current of the power station; obtaining the high-voltage side power of the plant according to the high-voltage side voltage of the plant and the high-voltage side current of the plant; when the power of the high-voltage side of the plant is smaller than or equal to a first preset value and larger than a second preset value, generating a load reduction instruction and sending the load reduction instruction to an AGC system of the new energy power station; and when the power of the high-voltage side of the high-voltage transformer of the factory is smaller than or equal to a second preset value, a tripping instruction is sent to a breaker connected with the incoming line. The power supply system has the advantages that the possibility that power supplies of different energy types are mutually connected in series is avoided, the power supply system can be realized by only modifying secondary wiring, the structure is clear, the logic is simple, the scheme is simple and feasible, no additional investment is added, the transformation cost is low, a hybrid power supply mode can be adopted for the self-power utilization of a power plant, the power supply capacity of the power plant to a power grid is improved, and the power utilization rate of the power plant is reduced.
Description
Technical Field
The invention belongs to the field of power control and regulation of power plants, and relates to a device and a method for preventing power supply of a station service system of a power plant from being connected in series.
Background
As the economy continues to grow rapidly since the 21 st century, energy supply including electricity plays a vital role in the development of economy and society, but the conventional energy structure is excessively single; meanwhile, the requirements of people on the environment are higher and higher, and the environmental protection and the economic development are put in the same important positions. Therefore, more and more thermal power plants are connected with partial new energy sources for power generation, and the method has important significance for energy conservation and emission reduction and carbon emission reduction in the power industry. At present, according to the environmental characteristics of a power plant project, a hybrid power supply mode is adopted for self-power utilization of the power plant at the place where wind resources and solar energy resources exist, a new energy power generation system such as wind energy, solar energy power generation and the like is connected to a power plant system, and electric energy required by part of power plant loads is provided, so that the power supply capacity of the power plant to a power grid is improved, and the purposes of reducing emission and power plant utilization rate are achieved.
However, after the new energy power generation system is connected to the station service power system, the power grid company has different internet power prices for different power generation types, and when different energy forms are used simultaneously, the possibility of mutually connecting the networks exists, so that the power price accounting is affected. Therefore, it is necessary to study how to ensure that the two electric quantities do not indirectly deliver electric quantities to the opposite power grid through the interconnection when the two energy forms are mutually supplemented.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a device and a method for preventing a power supply of a factory power system of a power plant from being connected in series.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect of the present invention, a method for preventing a power supply of a factory power system of a power plant from being connected in series, includes:
acquiring a high-voltage side voltage of a factory and a high-voltage side current of the factory; obtaining the high-voltage side power of the plant according to the high-voltage side voltage of the plant and the high-voltage side current of the plant;
when the power of the high-voltage side of the plant is smaller than or equal to a first preset value and larger than a second preset value, generating a load reduction instruction and sending the load reduction instruction to an AGC system of the new energy power station; and when the power of the high-voltage side of the high-voltage transformer of the factory is smaller than or equal to a second preset value, a tripping instruction is sent to a breaker connected with the incoming line.
Optionally, the method further comprises:
acquiring the voltage of the high-voltage side of the new energy main transformer and the current of the high-voltage side of the new energy main transformer; obtaining the power of the high-voltage side of the new energy main transformer according to the voltage of the high-voltage side of the new energy main transformer and the current of the high-voltage side of the new energy main transformer;
when the power of the high-voltage side of the new energy main transformer is smaller than or equal to a third preset value and larger than a fourth preset value, generating a power increasing instruction and sending the power increasing instruction to an AGC system of the new energy power station; and when the power of the high-voltage side of the new energy main transformer is smaller than or equal to a fourth preset value, a tripping instruction is sent to a circuit breaker for connecting the outgoing line.
Optionally, the third preset value is 0.1 times of the secondary rated power of the main transformer of the new energy, and the fourth preset value is 0.05 times of the secondary rated power of the main transformer of the new energy.
Optionally, before the obtaining the voltage of the high-voltage side of the main transformer of the new energy and the current of the high-voltage side of the main transformer of the new energy, the method further includes:
acquiring states of a breaker of a factory change incoming line, a breaker of a communication incoming line and a breaker of a communication outgoing line;
and when the states of the circuit breaker of the factory change incoming line, the circuit breaker of the communication incoming line and the circuit breaker of the communication outgoing line are in the combined state, the step of obtaining the high-voltage side voltage of the new energy main transformer and the high-voltage side current of the new energy main transformer is carried out.
Optionally, the first preset value is 0.1 times of the plant high-variable secondary rated power, and the second preset value is 0.05 times of the plant high-variable secondary rated power.
Optionally, before the obtaining the high-voltage side voltage of the plant and the high-voltage side current of the plant, the method further includes:
acquiring states of a breaker of a factory change incoming line, a breaker of a communication incoming line and a breaker of a communication outgoing line;
and when the states of the circuit breaker of the factory change incoming line, the circuit breaker of the communication incoming line and the circuit breaker of the communication outgoing line are all in the combined state, the steps of obtaining the voltage of the factory high-voltage side and the current of the factory high-voltage side are carried out.
In a second aspect of the present invention, an apparatus for preventing a power supply of a station service system of a power plant from being connected in series, includes:
the low-power input module is used for acquiring the high-voltage side voltage of the factory and the high-voltage side current of the factory; obtaining the high-voltage side power of the plant according to the high-voltage side voltage of the plant and the high-voltage side current of the plant;
the low-power protection module is used for generating a load reduction instruction and sending the load reduction instruction to an AGC system of the new energy power station when the power of the high-voltage side of the plant is smaller than or equal to a first preset value and larger than a second preset value; and when the power of the high-voltage side of the high-voltage transformer of the factory is smaller than or equal to a second preset value, a tripping instruction is sent to a breaker connected with the incoming line.
Optionally, the low-power input module is further configured to obtain a voltage of the high-voltage side of the new energy main transformer and a current of the high-voltage side of the new energy main transformer; obtaining the power of the high-voltage side of the new energy main transformer according to the voltage of the high-voltage side of the new energy main transformer and the current of the high-voltage side of the new energy main transformer;
the low-power protection module is further used for generating a power increasing instruction and sending the power increasing instruction to an AGC system of the new energy power station when the power of the high-voltage side of the new energy main transformer is smaller than or equal to a third preset value and larger than a fourth preset value; and when the power of the high-voltage side of the new energy main transformer is smaller than or equal to a fourth preset value, a tripping instruction is sent to a circuit breaker for connecting the outgoing line.
Compared with the prior art, the invention has the following beneficial effects:
according to the method for preventing the power supply of the station service system of the power plant from being connected in series, the high-voltage side voltage and the high-voltage side current of the station are obtained, so that the high-voltage side power of the station is obtained; then, based on the relation between the power of the high-voltage side of the plant and the first preset value and the second preset value, when the power of the high-voltage side of the plant is smaller than or equal to the first preset value and larger than the second preset value, generating a load reducing instruction and sending the load reducing instruction to an AGC system of the new energy power station; when the power of the high-voltage side of the high-voltage transformer of the factory is smaller than or equal to a second preset value, a tripping instruction is sent to a breaker connected with the incoming line, the possibility that power sources of different energy types are mutually connected in series is avoided, the power sources can be realized by only modifying secondary wiring, the structure is clear, the logic is simple, the scheme is simple and easy to operate, no additional investment is added, and the transformation cost is low. Aiming at the coexistence place of various power generation modes, a hybrid power supply mode can be adopted for the self-power utilization of the power plant, new energy power generation systems such as wind energy, solar power generation and the like are connected into the power plant system, the electric energy required by part of the power plant load is provided, the power supply capacity of the power plant to a power grid is improved, and the power plant power utilization rate is reduced.
Drawings
FIG. 1 is a schematic diagram of a method for preventing power supply of a power plant station service system from being connected in series;
fig. 2 is a schematic diagram of an apparatus for preventing power supply strings of a factory power system of a power plant according to the present invention.
Wherein: 1-plant hypervariability; 2-factory change line; 3-a breaker for a factory change line; 4-factory bus; 5-a circuit breaker communicating with the incoming line; 6-connecting incoming lines; 7-connecting outgoing lines; 8-a circuit breaker communicating the outgoing line; 9-a new energy bus; 10-a breaker of new energy outgoing lines; 11-new energy outgoing line; 12-new energy main transformer.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise 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.
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1 and 2, in an embodiment of the present invention, a method for preventing a power supply of a power plant power system from being connected in series is provided, so that a problem that a new energy power station and a power plant power system are connected in series can be effectively avoided.
Firstly, the application environment of the method for preventing the power supply of the power station service system from being connected in series is introduced: a factory electricity system of a power plant. The plant power system comprises a plant bus 4, a thermal power main transformer, a thermal power generation unit, a plant high transformer 1, a plant transformation incoming line 2, a plant feeder line, a communication incoming line 6, a communication outgoing line 7, a new energy bus 9, a new energy main transformer 12, a new energy outgoing line 11, a photovoltaic power generation unit and a wind power generation unit.
The thermal power generation unit is connected with a power grid through a thermal power main transformer, and is connected with a bus 4 for a plant through a plant high transformer 1 and a plant transformer incoming line 2; the factory feeder is connected with the factory bus 4; one end of the connecting incoming line 6 is connected with the factory bus 4, and the other end is connected with the new energy bus 9 through the connecting outgoing line 7. One end of the new energy main transformer 12 is connected with a power grid, the other end of the new energy main transformer is connected with the new energy bus 9 through a new energy outlet 11, and the photovoltaic power generation unit and the wind power generation unit are connected with the new energy bus 9. And the plant transformation incoming line 2, the communication incoming line 6 and the communication outgoing line 7 are all provided with circuit breakers.
Specifically, the method for preventing the power supply of the power station service system from being connected in series comprises the following steps:
s1: and obtaining the high-voltage side voltage of the high transformer 1 and the high-voltage side current of the high transformer 1, and obtaining the high-voltage side power of the high transformer 1 according to the high-voltage side voltage of the high transformer 1 and the high-voltage side current of the high transformer 1.
Specifically, the voltage detection device and the current detection device can detect the voltage of the high-voltage side of the high-voltage transformer 1 and the current of the high-voltage side of the high-voltage transformer 1, which are generally the secondary three-phase voltage and the secondary three-phase current, and then the power of the high-voltage side of the high-voltage transformer 1 is obtained through calculation according to the voltage of the high-voltage side of the high-voltage transformer 1 and the current of the high-voltage side of the high-voltage transformer 1.
Optionally, before obtaining the high side voltage of the high side 1 of the plant and the high side current of the high side 1 of the plant, the method further comprises: acquiring states of a breaker 3 of a factory change incoming line, a breaker 5 of a communication incoming line and a breaker 8 of a communication outgoing line; when the states of the circuit breaker 3 of the factory change incoming line, the circuit breaker 5 of the communication incoming line and the circuit breaker 8 of the communication outgoing line are all in the combined state, the steps of obtaining the voltage of the high-voltage side of the factory change 1 and the current of the high-voltage side of the factory change 1 are carried out.
The states of the circuit breaker 3 of the plant change inlet wire, the circuit breaker 5 of the communication inlet wire and the circuit breaker 8 of the communication outlet wire are acquired to determine whether the thermal power plant and the new energy power plant are in the connected state, and when the states of the circuit breaker 3 of the plant change inlet wire, the circuit breaker 5 of the communication inlet wire and the circuit breaker 8 of the communication outlet wire are in the combined state, the state that the thermal power plant and the new energy power plant are in the connected state is described, and at the moment, the power supply of the plant station power system is required to be prevented from being connected in series. When one of the states of the breaker 3 for the incoming line, the breaker 5 for the incoming line and the breaker 8 for the outgoing line is in a disconnection state, the thermal power plant and the new energy power plant are in a disconnection state, and at the moment, the power supply of the station service system of the power plant is not required to be prevented from being connected in series. By adopting the mode, the workload of acquisition and detection is effectively reduced.
S2: when the power of the high-voltage side of the plant high-voltage transformer 1 is smaller than or equal to a first preset value and larger than a second preset value, generating a load reduction instruction and sending the load reduction instruction to an AGC system of the new energy power station; and when the power of the high-voltage side of the high-voltage transformer 1 of the factory is smaller than or equal to a second preset value, a tripping instruction is sent to the circuit breaker 5 of the communication incoming line.
In normal operation, the new energy bus 9 provides electric energy for the factory bus 4 through the connection outgoing line 7 and the connection incoming line 6. When the new energy system provides excessive electric energy to the factory system, namely the factory high-speed transformer 1 reversely outputs active power, the power output protection of the new energy bus 9 to the factory bus 4 needs to be ensured.
Specifically, in this embodiment, the power operation setting value is set and divided into a high value section setting value and a low value section setting value. When the high value section is smaller than or equal to the first preset value and larger than the second preset value, most of the load of the power system of the thermal power plant is provided by the new energy power station through the connection incoming line 6 and the connection outgoing line 7, so that the current power transmission of the new energy bus 9 to the power bus 4 is required to be maintained or the power transmitted to the power bus 4 is required to be reduced in order to prevent the energy from flowing reversely, and therefore a load reducing instruction is generated and sent to the AGC system of the new energy power station to reduce the power generation power of the new energy power station.
The low value section constant value is smaller than or equal to a second preset value, when the low value section constant value is met, the fact that almost all loads of a power system of a thermal power plant are provided by a new energy power station through a connection incoming line 6 and a connection outgoing line 7 is indicated, if the new energy power station increases power to be transmitted to a bus 4 for the plant, the energy of the new energy power station is possibly transmitted to a power grid through a high-speed transformer 1 of the thermal power plant, and the connection incoming line 6 needs to be cut off immediately so as to ensure that no networking occurs. Therefore, a tripping instruction is sent to the circuit breaker 5 of the connection incoming line, the connection incoming line 6 is cut off, and the electric quantity of the new energy power station is prevented from being returned to the power grid outgoing line of the thermal power plant.
Optionally, the first preset value is 0.1 times of the plant high-speed transformer 1 secondary rated power, and the second preset value is 0.05 times of the plant high-speed transformer 1 secondary rated power.
In one possible implementation manner, the method for preventing the power supply of the station service power system of the power plant from being connected in series further comprises the following steps:
s3: acquiring the voltage of the high-voltage side of the new energy main transformer 12 and the current of the high-voltage side of the new energy main transformer 12; and obtaining the high-voltage side power of the new energy main transformer 12 according to the high-voltage side voltage of the new energy main transformer 12 and the high-voltage side current of the new energy main transformer 12.
Specifically, the voltage detection device and the current detection device can detect the high-voltage side voltage of the new energy main transformer 12 and the high-voltage side current of the new energy main transformer 12, which are generally a secondary three-phase voltage and a secondary three-phase current, and then calculate to obtain the high-voltage side power of the new energy main transformer 12 according to the high-voltage side voltage of the new energy main transformer 12 and the high-voltage side current of the new energy main transformer 12.
Optionally, before the obtaining the voltage of the high-voltage side of the new energy main transformer 12 and the current of the high-voltage side of the new energy main transformer 12, the method further includes: acquiring states of a breaker 3 of a factory change incoming line, a breaker 5 of a communication incoming line and a breaker 8 of a communication outgoing line; when the states of the breaker 3 of the factory change incoming line, the breaker 5 of the communication incoming line and the breaker 8 of the communication outgoing line are all in the combined state, the step of acquiring the high-voltage side voltage of the new energy main transformer 12 and the high-voltage side current of the new energy main transformer 12 is carried out. The state of the circuit breaker 3 of the factory change incoming line, the state of the circuit breaker 5 of the interconnection incoming line and the state of the circuit breaker 8 of the interconnection outgoing line are obtained to represent the connection state between the thermal power plant and the new energy power plant, and then whether the follow-up steps are carried out or not is determined.
S4: when the high-voltage side power of the new energy main transformer 12 is smaller than or equal to a third preset value and larger than a fourth preset value, generating a power increasing instruction and sending the power increasing instruction to an AGC system of the new energy power station; and when the high-voltage side power of the new energy main transformer 12 is smaller than or equal to a fourth preset value, a tripping instruction is sent to the circuit breaker 8 for connecting the outgoing line.
Optionally, the third preset value is 0.1 times of the secondary rated power of the new energy main transformer 12, and the fourth preset value is 0.05 times of the secondary rated power of the new energy main transformer 12.
When the power supplied by the factory system to the new energy system is excessive, namely the power of the high-voltage side of the new energy main transformer 12 is smaller than or equal to a third preset value. When the high-voltage side power of the new energy main transformer 12 is smaller than or equal to a third preset value and larger than a fourth preset value, generating a power increasing command and sending the power increasing command to an AGC system of the new energy power station so as to increase the generated power of the new energy power station. And when the high-voltage side power of the new energy main transformer 12 is smaller than or equal to a fourth preset value, a tripping instruction is sent to the circuit breaker 8 for connecting the outgoing line, so that the electric quantity of the thermal power plant is prevented from being returned to the new energy power station power grid outgoing line.
According to the method for preventing the power supply of the station service system of the power plant from being connected in series, the power of the station high-voltage side 1 and the power of the station high-voltage side 1 are obtained by obtaining the voltage of the station high-voltage side 1 and the current of the station high-voltage side 1, so that the power of the station high-voltage side 1 is obtained; then, based on the relation between the high-voltage side power of the high-voltage transformer 1 of the plant and the first preset value and the second preset value, when the high-voltage side power of the high-voltage transformer 1 of the plant is smaller than or equal to the first preset value and larger than the second preset value, generating a load reducing instruction and sending the load reducing instruction to an AGC system of the new energy power station; when the power of the high-voltage side of the high-voltage transformer 1 of the factory is smaller than or equal to a second preset value, a tripping instruction is sent to the circuit breaker 5 of the interconnection incoming line, the possibility that power sources of different energy types are mutually connected in series is avoided, the power sources can be realized by only modifying secondary wiring, the structure is clear, the logic is simple, the scheme is simple and easy to operate, no additional investment is added, and the transformation cost is low. Aiming at the coexistence place of various power generation modes, a hybrid power supply mode can be adopted for the self-power utilization of the power plant, new energy power generation systems such as wind energy, solar power generation and the like are connected into the power plant system, the electric energy required by part of the power plant load is provided, the power supply capacity of the power plant to a power grid is improved, and the power plant power utilization rate is reduced. The generated electric quantity of the new energy power station is only used as the supplement of plant power of the power station, and the electric quantity is not transmitted to the power grid through the thermal power station; meanwhile, the station power supply of the power plant does not transmit electric quantity to the power grid through the new energy power station.
In still another embodiment of the present invention, an apparatus for preventing a power supply string of a power plant factory electric system is provided, which may be used to implement the above method for preventing a power supply string of a power plant factory electric system, including a low power input module and a low power protection module.
The low-power input module is used for acquiring the voltage of the high-voltage side of the high transformer 1 of the factory and the current of the high-voltage side of the high transformer 1 of the factory; obtaining the high-voltage side power of the plant high-voltage transformer 1 according to the high-voltage side voltage of the plant high-voltage transformer 1 and the high-voltage side current of the plant high-voltage transformer 1; the low-power protection module is used for generating a load reduction instruction and sending the load reduction instruction to an AGC system of the new energy power station when the power of the high-voltage side of the high-voltage transformer 1 of the plant is smaller than or equal to a first preset value and larger than a second preset value; and when the power of the high-voltage side of the high-voltage transformer 1 of the factory is smaller than or equal to a second preset value, a tripping instruction is sent to the circuit breaker 5 of the communication incoming line.
In a possible implementation manner, the low-power input module is further configured to obtain a high-voltage side voltage of the new energy main transformer 12 and a high-voltage side current of the new energy main transformer 12; obtaining the high-voltage side power of the new energy main transformer 12 according to the high-voltage side voltage of the new energy main transformer 12 and the high-voltage side current of the new energy main transformer 12; the low-power protection module is further used for generating a power increasing instruction and sending the power increasing instruction to an AGC system of the new energy power station when the power of the high-voltage side of the new energy main transformer 12 is smaller than or equal to a third preset value and larger than a fourth preset value; and when the high-voltage side power of the new energy main transformer 12 is smaller than or equal to a fourth preset value, a tripping instruction is sent to the circuit breaker 8 for connecting the outgoing line.
Specifically, the device for preventing the power supply of the power station service system from being connected in series can be designed according to the following electrical parameters: dc power supply voltage: 220V/110V, about 10W power consumption, fluctuation range of-20% to +10%: 100V, ac input current: 5A/1A, nominal frequency: 50Hz.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. A method for preventing power supply strings of a power plant power system, comprising:
obtaining the voltage of the high-voltage side of the plant high-voltage transformer (1) and the current of the high-voltage side of the plant high-voltage transformer (1); obtaining the high-voltage side power of the plant high-voltage transformer (1) according to the high-voltage side voltage of the plant high-voltage transformer (1) and the high-voltage side current of the plant high-voltage transformer (1);
when the power of the high-voltage side of the plant high-voltage transformer (1) is smaller than or equal to a first preset value and larger than a second preset value, generating a load reduction instruction and sending the load reduction instruction to an AGC system of the new energy power station; when the power of the high-voltage side of the plant high-voltage transformer (1) is smaller than or equal to a second preset value, a tripping instruction is sent to a circuit breaker (5) communicating with the incoming line;
further comprises:
acquiring the high-voltage side voltage of the new energy main transformer (12) and the high-voltage side current of the new energy main transformer (12); obtaining the high-voltage side power of the new energy main transformer (12) according to the high-voltage side voltage of the new energy main transformer (12) and the high-voltage side current of the new energy main transformer (12);
when the high-voltage side power of the new energy main transformer (12) is smaller than or equal to a third preset value and larger than a fourth preset value, generating a power increasing instruction and sending the power increasing instruction to an AGC system of the new energy power station; and when the high-voltage side power of the new energy main transformer (12) is smaller than or equal to a fourth preset value, a tripping instruction is sent to the circuit breaker (8) communicating the outgoing line.
2. A method for preventing a power supply string network of a power plant power system according to claim 1, wherein the third preset value is 0.1 times of the secondary rated power of the new energy main transformer (12), and the fourth preset value is 0.05 times of the secondary rated power of the new energy main transformer (12).
3. A method for preventing a power supply string network of a power station service system of a power plant according to claim 1, wherein before obtaining the high-voltage side voltage of the main power transformer (12) of the new energy and the high-voltage side current of the main power transformer (12) of the new energy, further comprises:
acquiring states of a breaker (3) of a factory change incoming line, a breaker (5) of a communication incoming line and a breaker (8) of a communication outgoing line;
when the states of the breaker (3) of the factory change incoming line, the breaker (5) of the communication incoming line and the breaker (8) of the communication outgoing line are all in the combined state, the steps of obtaining the high-voltage side voltage of the new energy main transformer (12) and the high-voltage side current of the new energy main transformer (12) are carried out.
4. A method of preventing a power supply string for a power plant utility system as set forth in claim 1, wherein the first preset value is 0.1 times the secondary rated power of the plant elevation (1) and the second preset value is 0.05 times the secondary rated power of the plant elevation (1).
5. A method for preventing a power supply string network of a power plant power system according to claim 1, wherein before obtaining the high-side voltage of the plant high-voltage transformer (1) and the high-side current of the plant high-voltage transformer (1), further comprises:
acquiring states of a breaker (3) of a factory change incoming line, a breaker (5) of a communication incoming line and a breaker (8) of a communication outgoing line;
when the states of the circuit breaker (3) of the factory change incoming line, the circuit breaker (5) of the communication incoming line and the circuit breaker (8) of the communication outgoing line are all in the combined state, the steps of obtaining the voltage of the high-voltage side of the factory change (1) and the current of the high-voltage side of the factory change (1) are carried out.
6. An apparatus for preventing power supply strings of a power plant power system, comprising:
the low-power input module is used for acquiring the voltage of the high-voltage side of the high-voltage transformer (1) of the factory and the current of the high-voltage side of the high-voltage transformer (1) of the factory; obtaining the high-voltage side power of the plant high-voltage transformer (1) according to the high-voltage side voltage of the plant high-voltage transformer (1) and the high-voltage side current of the plant high-voltage transformer (1);
the low-power protection module is used for generating a load reduction instruction and sending the load reduction instruction to an AGC system of the new energy power station when the power of the high-voltage side of the plant high-voltage transformer (1) is smaller than or equal to a first preset value and larger than a second preset value; when the power of the high-voltage side of the plant high-voltage transformer (1) is smaller than or equal to a second preset value, a tripping instruction is sent to a circuit breaker (5) communicating with the incoming line;
the low-power input module is also used for acquiring the high-voltage side voltage of the new energy main transformer (12) and the high-voltage side current of the new energy main transformer (12); obtaining the high-voltage side power of the new energy main transformer (12) according to the high-voltage side voltage of the new energy main transformer (12) and the high-voltage side current of the new energy main transformer (12);
the low-power protection module is further used for generating a power increasing instruction and sending the power increasing instruction to an AGC system of the new energy power station when the power of the high-voltage side of the new energy main transformer (12) is smaller than or equal to a third preset value and larger than a fourth preset value; and when the high-voltage side power of the new energy main transformer (12) is smaller than or equal to a fourth preset value, a tripping instruction is sent to the circuit breaker (8) communicating the outgoing line.
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| JP2014057518A (en) * | 2010-06-21 | 2014-03-27 | Hitachi Ltd | Control system of new energy power plant group and its control method |
| CN107887973A (en) * | 2016-09-30 | 2018-04-06 | 侯宇程 | A kind of method that thermal power plant station service power consumption rate is reduced using solar energy power generating |
| CN112531773A (en) * | 2020-11-27 | 2021-03-19 | 合肥阳光新能源科技有限公司 | New energy power generation system and energy regulation and control method and device thereof |
| CN113300415A (en) * | 2021-06-25 | 2021-08-24 | 西安热工研究院有限公司 | Auxiliary frequency modulation system based on power plant new energy power generation technology |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014057518A (en) * | 2010-06-21 | 2014-03-27 | Hitachi Ltd | Control system of new energy power plant group and its control method |
| CN107887973A (en) * | 2016-09-30 | 2018-04-06 | 侯宇程 | A kind of method that thermal power plant station service power consumption rate is reduced using solar energy power generating |
| CN112531773A (en) * | 2020-11-27 | 2021-03-19 | 合肥阳光新能源科技有限公司 | New energy power generation system and energy regulation and control method and device thereof |
| CN113300415A (en) * | 2021-06-25 | 2021-08-24 | 西安热工研究院有限公司 | Auxiliary frequency modulation system based on power plant new energy power generation technology |
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