CN113381450B - Distributed power supply access point power quality evaluation system and evaluation control method thereof - Google Patents
Distributed power supply access point power quality evaluation system and evaluation control method thereof Download PDFInfo
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- CN113381450B CN113381450B CN202110787227.5A CN202110787227A CN113381450B CN 113381450 B CN113381450 B CN 113381450B CN 202110787227 A CN202110787227 A CN 202110787227A CN 113381450 B CN113381450 B CN 113381450B
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- 238000013441 quality evaluation Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000011156 evaluation Methods 0.000 title claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 39
- 238000012544 monitoring process Methods 0.000 claims abstract description 24
- 238000007664 blowing Methods 0.000 claims abstract description 15
- 230000001939 inductive effect Effects 0.000 claims description 19
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000005452 bending Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005540 biological transmission Effects 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
- 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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- 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
-
- 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
- Y04S10/12—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 discloses a distributed power supply access point power quality evaluation system and an evaluation control method thereof. Belonging to the technical field of distributed power supply access point power quality evaluation. The system comprises a power distribution network, a micro-grid and a power grid power quality monitoring platform, wherein a bus voltage detection sensor capable of detecting bus voltage and a first power detector capable of detecting the power on a bus are respectively arranged on the bus of the power distribution network; the micro-grid comprises a plurality of wind driven generators, wherein a second power detector capable of detecting the output power of each wind driven generator is respectively arranged at the power output end of each wind driven generator, each wind driven generator is also respectively provided with an intelligent induced draft device with adjustable blowing wind power, and the rear end of the intelligent induced draft device is fixed on a rack of the wind driven generator; and the control ends of the master voltage detection sensor, the first power detector, the second power detector and the intelligent induced draft device are respectively connected with the power quality monitoring platform of the power grid.
Description
Technical Field
The invention relates to the technical field of distributed power supply access point power quality evaluation, in particular to a distributed power supply access point power quality evaluation system and an evaluation control method thereof.
Background
At present, distributed wind power generators are already used as power supply sources of an electric power system by connecting a microgrid to a bus of a power distribution network.
Because the microgrid is generally a power supply provided by a wind driven generator, and the wind driven generator generates electricity with intermittence and fluctuation, when the wind driven generator provides power for the power distribution network, the quality of the electric energy of a distributed power supply access point needs to be evaluated.
The existing evaluation control method cannot carry out smoothness control and stability control on active power on a power distribution network bus.
Disclosure of Invention
The invention provides a system and a method for evaluating the electric energy quality of a distributed power supply access point, which can carry out smoothness control and stability control on active power on a bus of a power distribution network and have high reliability, in order to solve the defect of poor reliability of the electric energy quality evaluation of the distributed power supply access point.
In order to achieve the purpose, the invention adopts the following technical scheme:
the distributed power supply access point power quality evaluation system comprises a power distribution network, a micro-grid and a power grid power quality monitoring platform, wherein a bus voltage detection sensor capable of detecting bus voltage and a first power detector capable of detecting the power on the bus are respectively arranged on a bus of the power distribution network;
the micro-grid comprises a plurality of wind driven generators, a second power detector capable of detecting the output power of each wind driven generator is arranged at the power output end of each wind driven generator, each wind driven generator is also provided with an intelligent air inducing device with adjustable air blowing wind power, the rear end of each intelligent air inducing device is fixed on a rack of the wind driven generator, and the air outlet of each intelligent air inducing device is arranged right opposite to the fan blade of the corresponding wind driven generator;
the control ends of the mother voltage detection sensor, the first power detector, the second power detector and the intelligent induced draft device are respectively connected with the power quality monitoring platform of the power grid.
An evaluation control method suitable for a distributed power supply access point power quality evaluation system is implemented by the following steps:
under the control of a power quality monitoring platform of a power grid, a first power detector monitors the voltage on a power distribution network bus in real time, and a bus voltage detection sensor monitors the active power of a load connected to the power distribution network bus in real time;
after the wind driven generators arranged in a distributed mode are connected to the grid, the line loss of a power distribution network is reduced, and the voltage drop from a micro-grid to the power distribution network is reduced, so that the voltage on a bus of the power distribution network is raised, and the raising degree of the voltage on the bus of the power distribution network is linearly related to the access position and the access capacity of an output power supply of the distributed wind driven generator;
when the power capacity output by the wind driven generator is not equal to the electric quantity required by the load connected to the bus, the intelligent induced draft device adjusts the blowing wind power;
firstly, controlling the power supply capacity output by the wind driven generator by controlling the blowing wind power of the wind driven generator;
then the active power on the bus of the power distribution network can be naturally controlled by the power capacity output by the wind driven generator;
because the intelligent induced draft device can smoothly adjust the magnitude of the blowing wind power, smoothness control and stability control can be carried out on the active power on the bus of the power distribution network through the intelligent induced draft device.
Preferably, the intelligent air inducing device comprises a main air inducing pipe, and an air outlet at the rear end of the main air inducing pipe is arranged right opposite to a fan blade of the wind driven generator; a horn-shaped wind-gathering cover is arranged at an air inlet at the front end of the main induced draft pipe, a horn mouth of the wind-gathering cover is arranged outwards, and a top end opening of the wind-gathering cover is connected to the air inlet of the main induced draft pipe in a butt joint mode; the wind-gathering cover is provided with a plurality of cover wall holes with openings parallel to the edge of the bell mouth of the wind-gathering cover, each cover wall hole is respectively provided with a hole door capable of closing the corresponding cover wall hole, and each hole door is driven by an independent air cylinder to control the opening and the closing of the hole door; and each cylinder is respectively connected with a power grid power quality monitoring platform.
Preferably, an in-pipe wind power detection area is arranged in the main induced draft pipe, and a horizontal plane wind power detection device and a vertical plane wind power detection device are respectively arranged in the in-pipe wind power detection area at intervals;
the horizontal plane wind power detection device comprises a first string, a first tension sensor and a first camera;
the vertical surface wind power detection device comprises a second string, a second tension sensor and a second camera;
the first tension sensor is fixed on the left inner pipe wall of the main induced duct, two ends of the first thin rope are respectively fixed on the right inner pipe wall of the main induced duct and the tension detection end of the first tension sensor, and the first camera is fixedly arranged on the upper inner pipe wall of the main induced duct;
the second tension sensor is fixed on the upper inner pipe wall of the main induced duct, two ends of the second thin rope are respectively fixed on the lower inner pipe wall of the main induced duct and the tension detection end of the second tension sensor, and the second camera is fixedly arranged on the left inner pipe wall of the main induced duct;
the first tension sensor, the second tension sensor, the first camera and the second camera are respectively connected with the power grid power quality monitoring platform;
and the power grid power quality monitoring platform is provided with an image processing module connected with the power grid power quality monitoring platform.
Preferably, a plurality of lower mark points are uniformly distributed on the lower inner pipe wall of the main induced draft pipe positioned in the wind power detection area in the pipe; and a plurality of right mark points are uniformly distributed on the right inner pipe wall of the main induced draft pipe positioned in the wind power detection area in the pipe.
The invention can achieve the following effects:
the method can carry out smoothness control and stability control on the active power on the bus of the power distribution network, and has the advantages of high reliability, flexible and convenient use and good expansibility.
Drawings
Fig. 1 is a schematic diagram of a circuit principle connection structure of the present invention.
Fig. 2 is a schematic view of a connection structure of the intelligent wind induction device of the invention installed on a wind driven generator.
Fig. 3 is a schematic view of a connection structure at a wall hole of the wind-collecting hood of the invention.
Fig. 4 is a schematic diagram of a circuit principle connection structure of the power quality monitoring platform of the power grid and each control part.
Fig. 5 is a schematic view illustrating a state that the wind in the main induced duct is uniform at the time when the bending degree of the string is symmetrical according to the present invention.
Fig. 6 is a schematic view illustrating a state where the wind in the main draft tube is not uniform at this time when the curvature of the string is asymmetric according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
In an embodiment, a distributed power supply access point power quality evaluation system, as shown in fig. 1 to 4, includes a power distribution network 2, a micro-grid 3 and a power grid power quality monitoring platform 27, wherein a bus 7 of the power distribution network is respectively provided with a bus voltage detection sensor 5 capable of detecting bus voltage and a first power detector 6 capable of detecting power on the bus;
the micro-grid comprises a plurality of wind driven generators 4, a second power detector 26 capable of detecting the output power of each wind driven generator is arranged at the power output end of each wind driven generator, each wind driven generator is also provided with an intelligent air inducing device 19 with adjustable blowing wind power, the rear end of each intelligent air inducing device is fixed on a frame 8 of each wind driven generator, and the air outlet of each intelligent air inducing device is arranged right opposite to the fan blade 9 of the corresponding wind driven generator;
and the control ends of the master voltage detection sensor, the first power detector, the second power detector and the intelligent induced draft device are respectively connected with the power quality monitoring platform of the power grid.
The intelligent induced draft device comprises a main induced draft pipe 22, and an air outlet 30 at the rear end of the main induced draft pipe is arranged right opposite to a fan blade of the wind driven generator; a horn-shaped wind-collecting cover 24 is arranged at an air inlet 29 at the front end of the main induced draft pipe, the horn mouth of the wind-collecting cover is arranged outwards, and the top end mouth of the wind-collecting cover is in butt joint connection with the air inlet of the main induced draft pipe; the wind-gathering cover is provided with a plurality of cover wall holes 18 with openings parallel to the edge of the bell mouth of the wind-gathering cover, each cover wall hole is provided with a hole door 16 capable of closing the corresponding cover wall hole, and each hole door is driven by an independent air cylinder 15 to control the opening and the closing of the hole door; and each cylinder is respectively connected with a power grid power quality monitoring platform.
The wind-gathering cover is characterized in that a sliding groove 25 is formed in the outer wall of the wind-gathering cover at each cover wall hole, an anti-falling flange 17 is arranged on the outer opening edge of the sliding groove, the hole door is arranged in the sliding groove in a sliding mode, a cylinder seat of the air cylinder is fixedly arranged at the lower end of the sliding groove, and a telescopic rod of the air cylinder is fixedly connected to the hole door. The cylinder pushes the hole door to slide in the chute to realize the opening and closing of the hole door to the cover wall hole.
A wind power detection area 21 in the main induced duct is arranged in the main induced duct, and a horizontal plane wind power detection device and a vertical plane wind power detection device are respectively arranged in the wind power detection area in the main induced duct at intervals;
the horizontal plane wind power detection device comprises a first thin rope 13, a first tension sensor 14 and a first camera 23;
the vertical surface wind power detection device comprises a second thin rope 10, a second tension sensor 28 and a second camera 12;
the first tension sensor is fixed on the left inner pipe wall of the main induced duct, two ends of the first thin rope are respectively fixed on the right inner pipe wall of the main induced duct and the tension detection end of the first tension sensor, and the first camera is fixedly arranged on the upper inner pipe wall of the main induced duct;
the second tension sensor is fixed on the upper inner pipe wall of the main induced duct, two ends of the second thin rope are respectively fixed on the lower inner pipe wall of the main induced duct and the tension detection end of the second tension sensor, and the second camera is fixedly arranged on the left inner pipe wall of the main induced duct;
a tension sensor, a tension sensor II, a camera and a camera II are respectively connected with a power grid power quality monitoring platform.
And an image processing module 31 connected with the power grid power quality monitoring platform is arranged on the power grid power quality monitoring platform. The image processing module is easy to process the images shot by the camera.
A plurality of lower mark points 20 are uniformly distributed on the lower inner pipe wall of the main induced draft pipe positioned in the wind power detection area in the pipe; and a plurality of right mark points are uniformly distributed on the right inner pipe wall of the main induced draft pipe positioned in the wind power detection area in the pipe. When a user looks at a picture feared by the camera, the marking points can be used for judging the rough uniformity of the air in the main induced duct according to the positions of the marking points shielded by the strings. And the image processing module can conveniently process the string image.
An evaluation control method suitable for a distributed power supply access point power quality evaluation system is implemented by the following steps:
under the control of a power quality monitoring platform of a power grid, a first power detector monitors the voltage on a power distribution network bus in real time, and a bus voltage detection sensor monitors the active power of a load connected to the power distribution network bus in real time;
after the wind driven generators arranged in a distributed mode are connected to the grid, the line loss of a power distribution network is reduced, and the voltage drop from a micro-grid to the power distribution network is reduced, so that the voltage on a bus of the power distribution network is raised, and the raising degree of the voltage on the bus of the power distribution network is linearly related to the access position and the access capacity of an output power supply of the distributed wind driven generator;
when the power capacity output by the wind driven generator is not equal to the electric quantity required by the load 1 connected to the bus, the intelligent induced draft device adjusts the blowing wind power;
firstly, controlling the power supply capacity output by the wind driven generator by controlling the blowing wind power of the wind driven generator;
then the active power on the bus of the power distribution network can be naturally controlled by the power capacity output by the wind driven generator;
because the intelligent induced draft device can be smoothly adjusted to the wind power of blowing, smoothness control and stability control can be carried out on the active power on the power distribution network bus through the intelligent induced draft device.
The opening and closing of the hole door can be controlled through the air cylinder, and the size of the opening and closing of the hole door and the size of the air entering the main air inducing pipe from the air collecting cover can be well adjusted according to the number of the opened hole doors.
The corresponding string is shot through the camera, and the size of the time division can be known after the image is processed. If the wind power is high, the pressure detected by the tension sensor is high, and if the wind power is low, the tension detected by the tension sensor is low. And at this moment, the bending state of the corresponding string is shot through the camera, so that the uniformity of the wind in the main induced duct at this moment can be known, as shown in fig. 6, if the bending degree of the string is asymmetric, the wind in the main induced duct is not uniform at this moment, as shown in fig. 5, if the bending degree of the string is symmetric, the wind in the main induced duct is uniform at this moment, and the uneven wind blows on the fan blades to enable the blades to generate unbalanced shaking. The blade shake can influence the fan and damage, and then leads to the fan to export active power and appear not easily controlled.
After the wind driven generators arranged in a distributed mode are connected to the grid, the line loss of a power distribution network is reduced, and the voltage drop from a micro-grid to the power distribution network is reduced, so that the voltage on a bus of the power distribution network is raised, and the raising degree of the voltage on the bus of the power distribution network is linearly related to the access position and the access capacity of an output power supply of the distributed wind driven generator;
when the power capacity output by the wind driven generator is larger than the load required by the bus, the power supply of the wind driven generator reversely transmits power to the power distribution network, and the intelligent air inducing device reduces the blowing wind power so that the power capacity output by the wind driven generator is equal to the electric quantity required by the load connected to the bus;
when the power capacity output by the wind driven generator is smaller than the load required by the bus, the voltage of partial nodes of the bus and the transmission line of the grid-connected point of the distributed power supply is reduced, and the blowing wind power is increased by the intelligent wind inducing device, so that the power capacity output by the wind driven generator is equal to the electric quantity required by the load connected to the bus.
Claims (2)
1. The distributed power supply access point power quality evaluation system comprises a power distribution network, a micro-grid and a power grid power quality monitoring platform, and is characterized in that a bus of the power distribution network is respectively provided with a bus voltage detection sensor capable of detecting bus voltage and a first power detector capable of detecting the power on the bus;
the micro-grid comprises a plurality of wind driven generators, a second power detector capable of detecting the output power of each wind driven generator is arranged at the power output end of each wind driven generator, each wind driven generator is also provided with an intelligent air inducing device with adjustable air blowing wind power, the rear end of each intelligent air inducing device is fixed on a rack of the wind driven generator, and the air outlet of each intelligent air inducing device is arranged right opposite to the fan blade of the corresponding wind driven generator;
the control ends of the master voltage detection sensor, the first power detector, the second power detector and the intelligent induced draft device are respectively connected with the power quality monitoring platform of the power grid;
the intelligent air inducing device comprises a main air inducing pipe, and an air outlet at the rear end of the main air inducing pipe is arranged right opposite to a fan blade of the wind driven generator; a horn-shaped wind-gathering cover is arranged at an air inlet at the front end of the main induced draft pipe, a horn mouth of the wind-gathering cover is arranged outwards, and a top end opening of the wind-gathering cover is connected to the air inlet of the main induced draft pipe in a butt joint mode; the wind-gathering cover is provided with a plurality of cover wall holes with openings parallel to the edge of the bell mouth of the wind-gathering cover, each cover wall hole is respectively provided with a hole door capable of closing the corresponding cover wall hole, and each hole door is driven by an independent air cylinder to control the opening and the closing of the hole door; each air cylinder is respectively connected with a power grid power quality monitoring platform;
an in-tube wind power detection area is arranged in the main induced draft tube, and a horizontal plane wind power detection device and a vertical plane wind power detection device are respectively arranged in the in-tube wind power detection area at intervals;
the horizontal plane wind power detection device comprises a first string, a first tension sensor and a first camera;
the vertical surface wind power detection device comprises a second string, a second tension sensor and a second camera;
the first tension sensor is fixed on the left inner pipe wall of the main induced duct, two ends of the first thin rope are respectively fixed on the right inner pipe wall of the main induced duct and the tension detection end of the first tension sensor, and the first camera is fixedly arranged on the upper inner pipe wall of the main induced duct;
the second tension sensor is fixed on the upper inner pipe wall of the main induced duct, two ends of the second thin rope are respectively fixed on the lower inner pipe wall of the main induced duct and the tension detection end of the second tension sensor, and the second camera is fixedly arranged on the left inner pipe wall of the main induced duct;
the first tension sensor, the second tension sensor, the first camera and the second camera are respectively connected with the power grid power quality monitoring platform;
and the power grid power quality monitoring platform is provided with an image processing module connected with the power grid power quality monitoring platform.
2. An evaluation control method suitable for the distributed power supply access point power quality evaluation system of claim 1, wherein the distributed power supply access point power quality evaluation control method is implemented by the following steps:
under the control of a power quality monitoring platform of a power grid, a first power detector monitors the voltage on a power distribution network bus in real time, and a bus voltage detection sensor monitors the active power of a load connected to the power distribution network bus in real time;
after the wind driven generators arranged in a distributed mode are connected to the grid, the line loss of a power distribution network is reduced, and the voltage drop from a micro-grid to the power distribution network is reduced, so that the voltage on a bus of the power distribution network is raised, and the raising degree of the voltage on the bus of the power distribution network is linearly related to the access position and the access capacity of an output power supply of the distributed wind driven generator;
when the power capacity output by the wind driven generator is not equal to the electric quantity required by the load connected to the bus, the intelligent induced draft device adjusts the blowing wind power;
firstly, controlling the power supply capacity output by the wind driven generator by controlling the blowing wind power of the wind driven generator;
then the active power on the bus of the power distribution network can be naturally controlled by the power capacity output by the wind driven generator;
because the intelligent induced draft device can be smoothly adjusted to the wind power of blowing, smoothness control and stability control can be carried out on the active power on the power distribution network bus through the intelligent induced draft device.
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| CN113507142B (en) * | 2021-07-12 | 2024-09-20 | 国网浙江省电力有限公司经济技术研究院 | Power quality evaluation system for power grid power supply access point and evaluation control method thereof |
| CN115498689A (en) * | 2022-09-29 | 2022-12-20 | 国网江苏省电力有限公司南通供电分公司 | Distributed power supply access point power quality assessment system |
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