CN109474000B - Intelligent analysis system and method for distributed photovoltaic power supply of distribution transformer area - Google Patents
Intelligent analysis system and method for distributed photovoltaic power supply of distribution transformer area Download PDFInfo
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- H02J3/383—
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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
- H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention relates to an intelligent analysis system and method for distributed photovoltaic power supplies of distribution transformer areas, which mainly solve the problems that the prior art can not effectively utilize photovoltaic island power supply to supply power to load points in an island range when a power supply system fails, and the normal operation of the load in the island range is ensured. The photovoltaic island power supply system can effectively utilize the photovoltaic island power supply to supply power to the load points in the island range when the power supply system fails, so that the normal operation of the load in the island range is ensured, the utilization rate of light energy is improved, and the safe and stable operation of the power system is ensured.
Description
Technical Field
The invention relates to the technical field of photovoltaic distribution networks, in particular to a distribution transformer area distributed photovoltaic power intelligent analysis system and method.
Background
Nowadays, the distributed photovoltaic power generation technology is a novel power generation technology with a very promising prospect in China, and the distributed photovoltaic power generation technology is used for generating power by utilizing resources which are good for the environment and can be regenerated, such as solar energy. With the rapid development of economy in China and the progress of society, people are increasingly unable to leave electric power energy sources, and the electric power energy sources become an indispensable part in life of people, however, most of China uses chemical fuels such as coal, natural gas and petroleum to generate electricity all belonging to nonrenewable resources, so if the resources are used for a long time, the resources are exhausted all day by day, and not only do the resources have a larger defect that gas and fertile waste residues generated after combustion can pollute the environment, the demand of people on electric power is increased continuously, the generated energy is increased accordingly, and the environment is overwhelmed. Therefore, it is necessary to develop a new technology, and the distributed power generation technology highlights its advantages, and is both environment-friendly and energy-saving, but the distributed photovoltaic has uncontrollable property, so that it is easy to bring adverse effect to the reliability of power supply of the power distribution network.
The invention discloses a statistical analysis method of distributed power supply photovoltaic, which is disclosed in a patent specification with the application number of 201510459138.2 and the name of 'a statistical analysis method of distributed power supply photovoltaic', and aims to eliminate a power supply island and effectively utilize a photovoltaic power supply island to supply power to a load point in an island range when a power supply system fails, so that the normal operation of the load in the island range is ensured.
Disclosure of Invention
The invention mainly solves the problems that the prior art can not effectively utilize photovoltaic island power supply to supply power to load points in an island range when a power supply system fails, and normal operation of the load in the island range is ensured, and provides an intelligent analysis system and method for a distributed photovoltaic power supply of a distribution transformer area.
The technical problem of the invention is mainly solved by the following technical scheme: an intelligent analysis system for distributed photovoltaic power supplies in distribution transformer areas comprises a historical database for recording the power utilization load of each transformer area, a photovoltaic power supply, a grid-connected inverter for detecting the impedance change of a system before and after power failure of a power grid, a circuit breaking module for cutting off a circuit, an impedance judgment module, a data storage module, a data acquisition module, a data analysis module, a photovoltaic power supply distribution module, an alarm information sending module and a communication module, the historical database, the data acquisition module, the data analysis module, the photovoltaic power distribution module and the data storage module are connected in sequence, the photovoltaic power supply, the grid-connected inverter, the impedance judgment module, the alarm information sending module and the communication module are connected in sequence, the alarm information sending module is connected with the data storage module, the data storage module is connected with the historical database, and the circuit breaking module is connected with the grid-connected inverter.
The method comprises the steps of analyzing historical data of electricity utilization load of each distribution area to determine actual load demand of each area, analyzing the determined load demand of each area to obtain the minimum photovoltaic power supply required to be set and the specific distribution position of the photovoltaic power supply, detecting impedance change of a system before and after a breaker works by a grid-connected inverter, judging whether the power supply of a photovoltaic island is safe or not by an impedance judging module, and sending alarm information by an alarm information sending module through a communication module if the power supply of the photovoltaic island is unsafe.
Preferably, the circuit breaking module comprises a circuit breaker, a fuse and an automatic section switch, and when the power system fails, the photovoltaic power supply is disconnected from the power system.
As a preferred scheme, the communication module is GPRS communication and is used for sending alarm information to workers.
An intelligent analysis method for a distributed photovoltaic power supply of a distribution transformer area comprises the following steps:
s1, acquiring historical data of electricity utilization load of each station area in a historical database by a data acquisition module and sending the data to a data analysis module;
s2, analyzing historical data of the electric load of each transformer area by a data analysis module to determine the actual load demand of each area;
s3, the photovoltaic power distribution module analyzes the minimum photovoltaic power needed to be set and the specific distribution position of the photovoltaic power according to the load demand of each area determined by the data analysis module, and stores the data into the data storage module;
s4, when the power supply system has a fault, the connection between the power supply system and the power system is cut off by the circuit breaking module, the grid-connected inverter detects the impedance change of the system and sends detection data to the impedance judging module;
s5, the impedance judgment module compares the impedance change value with a preset impedance change threshold, when the impedance change value does not exceed the impedance change threshold, the alarm information sending module does not send alarm information, when the impedance change value exceeds the impedance change threshold, the alarm information sending module sends alarm information to a worker through the communication module, and the data storage module stores the information;
and S6, the data storage module transmits the information stored by the data storage module to a historical database for storage.
As a preferable scheme, the step S2 includes the steps of:
s21, dividing power users in the transformer area into a plurality of areas;
s22, determining the average electricity utilization load in each divided region;
and S23, adjusting the average electricity utilization load quantity in each area by ten percent to serve as the load demand quantity of each area.
As a preferable scheme, the step S3 includes the steps of:
s31, determining the quantity of photovoltaic power supplies which are needed by each region and are theoretically needed by each region according to the load demand quantity of each region;
s32, determining the actual photovoltaic power quantity required by each area theory required by each area according to the electric energy loss in the actual power utilization process, namely: the actual photovoltaic power supply quantity is the sum of the electric energy loss quantity and the theoretical photovoltaic power supply quantity.
Therefore, the invention has the advantages that: the photovoltaic island power supply can be effectively utilized to supply power to load points in an island range when a power supply system fails, normal operation of loads in the island range is guaranteed, the utilization rate of light energy is improved, and safe and stable operation of a power system is guaranteed.
Drawings
FIG. 1 is a block diagram of a control architecture of the present invention.
The system comprises a historical database 2, a data acquisition module 3, a data analysis module 4, a photovoltaic power distribution module 5, a data storage module 6, a photovoltaic power 7, a circuit breaking module 8, a grid-connected inverter 9, an impedance judgment module 10, an alarm information sending module 11 and a communication module.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b):
the distributed photovoltaic power intelligent analysis system of the distribution transformer area comprises a historical database 1 for recording the power utilization load of each transformer area, a photovoltaic power supply 6, a grid-connected inverter 8 for detecting the impedance change of a system before and after power grid outage, a circuit breaking module 7 for cutting off a circuit, an impedance judgment module 9, a data storage module 5, a data acquisition module 2, a data analysis module 3, a photovoltaic power distribution module 4, an alarm information sending module 10 and a communication module 11, wherein the historical database, the data acquisition module, the data analysis module, the photovoltaic power distribution module and the data storage module are sequentially connected, the photovoltaic power supply, the grid-connected inverter, the impedance judgment module, the alarm information sending module and the communication module are sequentially connected, the alarm information sending module is connected with the data storage module, and the data storage module is connected with the historical database, and the circuit breaking module is connected with the grid-connected inverter.
The method comprises the steps of analyzing historical data of electricity utilization load of each distribution area to determine actual load demand of each area, analyzing the determined load demand of each area to obtain the minimum photovoltaic power supply required to be set and the specific distribution position of the photovoltaic power supply, detecting impedance change of a system before and after a breaker works by a grid-connected inverter, judging whether the power supply of a photovoltaic island is safe or not by an impedance judging module, and sending alarm information by an alarm information sending module through a communication module if the power supply of the photovoltaic island is unsafe.
The circuit breaking module comprises a circuit breaker, a fuse and an automatic section switch, and when the power system fails, the photovoltaic power supply is disconnected from the power system. The communication module is used for GPRS communication and sending alarm information to workers. The impedance judgment module, the data storage module, the data acquisition module, the data analysis module, the photovoltaic power distribution module and the alarm information sending module are all sub-processing modules of a computer.
An intelligent analysis method for a distributed photovoltaic power supply of a distribution transformer area comprises the following steps:
s1, acquiring historical data of electricity utilization load of each station area in a historical database by a data acquisition module and sending the data to a data analysis module;
s2, analyzing historical data of the electric load of each transformer area by a data analysis module to determine the actual load demand of each area;
s21, dividing power users in the transformer area into a plurality of areas;
s22, determining the average electricity utilization load in each divided region;
s23, adjusting the average electricity utilization load quantity in each area by ten percent to serve as the load demand quantity of each area;
s3, the photovoltaic power distribution module analyzes the minimum photovoltaic power needed to be set and the specific distribution position of the photovoltaic power according to the load demand of each area determined by the data analysis module, and stores the data into the data storage module;
s31, determining the quantity of photovoltaic power supplies which are needed by each region and are theoretically needed by each region according to the load demand quantity of each region;
s32, determining the actual photovoltaic power quantity required by each area theory required by each area according to the electric energy loss in the actual power utilization process, namely: the actual photovoltaic power supply quantity is the sum of the electric energy loss quantity and the theoretical photovoltaic power supply quantity;
s4, when the power supply system has a fault, the connection between the power supply system and the power system is cut off by the circuit breaking module, the grid-connected inverter detects the impedance change of the system and sends detection data to the impedance judging module;
s5, the impedance judgment module compares the impedance change value with a preset impedance change threshold, when the impedance change value does not exceed the impedance change threshold, the alarm information sending module does not send alarm information, when the impedance change value exceeds the impedance change threshold, the alarm information sending module sends alarm information to a worker through the communication module, and the data storage module stores the information;
and S6, the data storage module transmits the information stored by the data storage module to a historical database for storage.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although the terms of the circuit breaking module, the impedance judging module, the data storage module, the data acquisition module, the data analysis module, the photovoltaic power distribution module, the alarm information sending module, the communication module and the like are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (5)
1. The utility model provides a distribution transformer district distributed photovoltaic power intelligent analysis system which characterized in that: the power supply monitoring system comprises a historical database for recording the power utilization load of each transformer area, a photovoltaic power supply, a grid-connected inverter for detecting the system impedance change before and after the power grid is cut off, a circuit breaking module for cutting off a circuit, an impedance judgment module, a data storage module, a data acquisition module, a data analysis module, a photovoltaic power distribution module, an alarm information sending module and a communication module, wherein the impedance judgment module judges whether the power supply of a photovoltaic island is safe or not; the system comprises a historical database, a data acquisition module, a data analysis module, a photovoltaic power distribution module and a data storage module which are sequentially connected, wherein a photovoltaic power supply, a grid-connected inverter, an impedance judgment module, an alarm information sending module and a communication module are sequentially connected, the alarm information sending module is connected with the data storage module, the data storage module is connected with the historical database, and a circuit breaking module is connected with the grid-connected inverter;
the intelligent analysis method for the distributed photovoltaic power supply of the distribution transformer area adopted by the system comprises the following steps:
s1, acquiring historical data of electricity utilization load of each station area in a historical database by a data acquisition module and sending the data to a data analysis module;
s2, analyzing historical data of the electric load of each transformer area by a data analysis module to determine the actual load demand of each area;
s3, the photovoltaic power distribution module analyzes the minimum photovoltaic power needed to be set and the specific distribution position of the photovoltaic power according to the load demand of each area determined by the data analysis module, and stores the data into the data storage module;
s4, when the power supply system has a fault, the connection between the power supply system and the power system is cut off by the circuit breaking module, the grid-connected inverter detects the impedance change of the system and sends detection data to the impedance judging module;
s5, the impedance judgment module judges whether the photovoltaic island power supply is safe; the impedance judgment module compares the impedance change value with a preset impedance change threshold, when the impedance change value does not exceed the impedance change threshold, the alarm information sending module does not send alarm information, when the impedance change value exceeds the impedance change threshold, the alarm information sending module sends the alarm information to a worker through the communication module, and the data storage module stores the information;
and S6, the data storage module transmits the information stored by the data storage module to a historical database for storage.
2. The distribution transformer area distributed photovoltaic power intelligent analysis system as claimed in claim 1, wherein the circuit breaking module comprises a circuit breaker, a fuse and an automatic section switch.
3. The system according to claim 1, wherein the communication module is a GPRS communication.
4. The distribution transformer area distributed photovoltaic power intelligent analysis system as claimed in claim 1, wherein the step S2 comprises the following steps:
s21, dividing power users in the transformer area into a plurality of areas;
s22, determining the average electricity utilization load in each divided region;
and S23, adjusting the average electricity utilization load quantity in each area by ten percent to serve as the load demand quantity of each area.
5. The distribution transformer area distributed photovoltaic power intelligent analysis system as claimed in claim 1, wherein the step S3 comprises the following steps:
s31, determining the quantity of photovoltaic power supplies which are needed by each region and are theoretically needed by each region according to the load demand quantity of each region;
s32, determining the actual photovoltaic power quantity required by each area theory according to the electric energy loss in the actual power utilization process, namely: the actual photovoltaic power supply quantity is the sum of the electric energy loss quantity and the theoretical photovoltaic power supply quantity.
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| CN113098056B (en) * | 2021-04-02 | 2022-03-15 | 广东技术师范大学 | Photovoltaic converter system for new energy grid connection |
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