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Distributed power supply grid connected alarm system and operating method thereof

A distributed power supply and alarm system technology, applied in the direction of circuit devices, electrical components, etc., can solve problems such as strong dispersion, large geographical span, increased reverse power transmission, misoperation safety accidents, etc., to achieve small detection blind spots, The effect of high detection accuracy and high safety

Active Publication Date: 2016-02-03
国网山东省电力公司聊城供电公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most research is on the impact of distributed power generation on the grid operation mode and the islanding detection method after grid connection, but there is little consideration for the convenience of the safety management of operation and maintenance personnel.
In 2015, applications for grid-connection of distributed power generation developed in a blowout manner. Due to the particularity of installation conditions, most of them were distributed power generation projects for households in towns and villages. The geographical spanning is large, the dispersion is strong, and management is prone to omissions and confusion. , combined with the development of the industry and the actual management status of power generation users by various management units, the difficulty is that it is impossible to notify the management personnel at the location of the power generation project in the first place, thus increasing the risk of safety accidents such as reverse power transmission and misoperation during power grid maintenance.
However, this patent has the following defects: (1) The detection current cannot obviously reflect the power quality change of the grid failure, because when the grid is powered off, the distributed power supply may still supply power to the load normally, and the current change is very small at this time, so it cannot be used as Judgment basis; (2) Does not have low-voltage ride-through capability and frequency response capability

Method used

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  • Distributed power supply grid connected alarm system and operating method thereof
  • Distributed power supply grid connected alarm system and operating method thereof
  • Distributed power supply grid connected alarm system and operating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A distributed power grid-connected alarm system, including a photovoltaic module 1, an inverter 2, a voltage loss trip circuit breaker 3, a knife switch 4, a grid-connected electric energy meter 5, an alarm device 6, and a leakage protection circuit breaker 7, the The photovoltaic module 1, the inverter 2, the voltage-loss trip circuit breaker 3, the grid-connected electric energy meter 5, the alarm device 6, and the leakage protection circuit breaker 7 are connected in sequence, and the voltage-loss trip The circuit breaker 3 is connected to the grid-connected electric energy meter 5 through the knife switch 4; the alarm device 6 includes a main control MCU 8 and an information collection module 9 connected to the main control MCU 8, an abnormal voltage alarm module 10, a frequency change An alarm module 11 , a display module 12 , an uplink communication module 13 , a storage module 14 and a power supply module 15 . Such as figure 1 shown.

[0040] The under-voltage ...

Embodiment 2

[0065] According to a distributed power grid-connected alarm system described in Embodiment 1, the difference is that the alarm device also includes: a clock unit circuit 16, a power management circuit 17, a WDT circuit 18, a temperature detection circuit 19 and an ESAM encryption circuit 20 , the clock unit circuit 16 , the power management circuit 17 , the WDT circuit 18 , the temperature detection circuit 19 and the ESAM encryption circuit 20 are respectively connected to the main control MCU 8 .

[0066] The clock unit circuit 16 provides the clock time required for the operation of the alarm device 6, adopts automatic temperature compensation, provides lithium batteries to maintain the normal operation of the clock during power outages, and alarms when the battery voltage is undervoltage; the power management circuit 17 provides various functions required by the main control MCU8 operation. A DC voltage to support system power outage reporting; WDT circuit 18 ensures the n...

Embodiment 3

[0068] The operating method of a distributed power grid-connected alarm system described in Embodiment 2, the specific steps include:

[0069] (1) The information acquisition module 9 acquires the grid side voltage value u and the frequency value f in real time and sends them to the main control MCU 8 in real time, and at the same time, sends the grid side voltage value u and the frequency value f acquired in real time to the display Module 12 shows;

[0070] (2) The main control MCU8 judges in real time whether the voltage value u exceeds the voltage normal operation threshold U, and when it is judged that the voltage value U exceeds the voltage normal operation threshold U, an alarm command is sent to the abnormal voltage alarm module 10, and the grid side voltage Value range and corresponding abnormal voltage alarm module 10 response time are as shown in table 1, otherwise, return step (1); Meanwhile, described master control MCU8 judges whether frequency value f exceeds fr...

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Abstract

The invention relates to a distributed power supply grid connected alarm system and an operating method thereof. The distributed power supply grid connected alarm system comprises a photovoltaic assembly, an inverter, a voltage-drop release breaker, a disconnector, a grid connected electric energy meter, an alarm device and an earth leakage protection breaker. The inverter, the voltage-drop release breaker, the grid connected electric energy meter, the alarm device and the earth leakage protection breaker are connected in sequence. The voltage-drop release breaker is connected to the grid connected electric energy meter through the disconnector. The alarm device comprises a master control MCU, and also an information acquisition module, a voltage abnormity alarm module, a frequency change alarm module, a display module, an uplink communication module, a storage module and a power supply module that are connected to the master control MCU. When the distributed power supply grid connected alarm system is running, the earth leakage protection breaker is connected to a power grid side, and the alarm device can send alarm information, if voltage drops or frequency changes of the power grid side exceed a certain range, to notify management workers of checking the running condition of distributed power supply grid connected system equipment. Therefore, the safety of a power grid, equipment and operation management workers is improved in a wider scope and to a greater extent.

Description

technical field [0001] The invention relates to a distributed power grid-connected alarm system and an operating method thereof, belonging to the technical field of distributed power grid-connected detection. Background technique [0002] As the country's promotion and use of new energy is becoming more and more popular, how to ensure safe and orderly management of power generation customers has become an important issue for power supply companies. [0003] At present, the most research is on the influence of distributed power generation on the grid operation mode and the research on the islanding detection method after grid connection, but the details of the safety management of operation and maintenance personnel are rarely considered. In 2015, applications for grid-connection of distributed power generation developed in a blowout manner. Due to the particularity of installation conditions, most of them were distributed power generation projects for households in towns and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J13/00
Inventor 聂翔魏晓蔚靳印涵魏嘉琦岳玉先蒋将汝锐锐李伟佀伟李琳许吉凯张一禾
Owner 国网山东省电力公司聊城供电公司
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