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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- 238000007405 data analysis Methods 0.000 claims abstract description 19
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- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000010248 power generation Methods 0.000 description 4
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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
- 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
- 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
本发明涉及一种配变台区分布式光伏电源智能分析系统及方法，主要解决了现有技术不能有效利用光伏孤岛供电以达到在供电系统故障时，可以对孤岛范围内的负荷点进行供电，保证孤岛范围内负荷的正常运行的问题，包括记录各个台区用电负荷量的历史数据库、光伏电源、检测电网断电前后系统阻抗变化的并网逆变器、切断电路的断路模块、阻抗判断模块、数据存储模块、数据采集模块、数据分析模块、光伏电源分布模块、告警信息发送模块以及通讯模块。本发明可以有效利用光伏孤岛供电以达到在供电系统故障时，可以对孤岛范围内的负荷点进行供电，保证孤岛范围内负荷的正常运行，提高了对光能源的利用率，保证了电力系统的安全稳定运行。
The invention relates to an intelligent analysis system and method of distributed photovoltaic power supply in a distribution and transformation station area, which mainly solves the problem that the existing technology cannot effectively use photovoltaic island power supply to achieve power supply to load points within the island range when the power supply system fails. The problem of ensuring the normal operation of the load within the scope of the island, including the historical database for recording the power consumption of each station area, the photovoltaic power supply, the grid-connected inverter to detect the change of the system impedance before and after the power outage, the circuit breaker module to cut off the circuit, and the impedance judgment module, data storage module, data acquisition module, data analysis module, photovoltaic power distribution module, alarm information sending module and communication module. The invention can effectively utilize the photovoltaic island to supply power, so that when the power supply system fails, it can supply power to the load points within the scope of the island, ensure the normal operation of the load within the scope of the island, improve the utilization rate of light energy, and ensure the power system. Safe and stable operation.
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.
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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 |
| CN118763811B (en) * | 2024-09-05 | 2024-12-20 | 南京宇泛网络科技有限公司 | A data query monitoring system |
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