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
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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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