CN217388312U

CN217388312U - Group string type photovoltaic power station alternating current low-voltage power distribution unit monitoring and diagnosing system

Info

Publication number: CN217388312U
Application number: CN202221237616.7U
Authority: CN
Inventors: 李毅; 吕艳秋; 张文斌; 杨胜林; 何信林; 刘冲; 史振利; 方子朝
Original assignee: Xian Thermal Power Research Institute Co Ltd
Current assignee: Xian Thermal Power Research Institute Co Ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-09-06
Anticipated expiration: 2032-05-19

Abstract

The utility model discloses a group's string formula photovoltaic power plant alternating current low pressure distribution unit monitoring diagnostic system, including treater, current transformer, voltage transformer, arc light sensor, temperature sensor, observing and controlling system, current acquisition module, voltage acquisition module, arc light detection module, wire temperature acquisition module, switch position and protection action acquisition module and inverter state acquisition module; the processor is connected with the inverter state acquisition module, the switch position and protection action acquisition module, the wire temperature acquisition module, the arc light detection module, the voltage acquisition module and the current acquisition module, and the processor is connected with the measurement and control system, and the system can carry out fault diagnosis on the alternating-current low-voltage power distribution unit.

Description

Group string type photovoltaic power station alternating current low-voltage power distribution unit monitoring and diagnosing system

Technical Field

The utility model belongs to new forms of energy on-line monitoring equipment field relates to a group's string formula photovoltaic power plant exchanges low pressure distribution unit monitoring diagnostic system.

Background

The alternating current low-voltage power distribution unit on the low-voltage side of the group-series photovoltaic power station step-up transformer is a low-voltage electric energy concentration and transmission device in a photovoltaic power station system, is an important electrical power distribution facility and directly influences the safety of a power station. As the voltage of ac low-voltage power distribution units is increasing, there are many problems in terms of safe operation, maintenance, etc., such as overcurrent, overvoltage, single-phase grounding, short circuit, overvoltage, disconnection, flashover, etc. The method is very important for detecting, recording and diagnosing the alternating-current low-voltage power distribution unit.

At present, an alternating current low-voltage power distribution unit mainly utilizes the protection of a switch as the protection of the alternating current low-voltage power distribution unit, the reason of an accident cannot be effectively analyzed after the fault often occurs, the analysis means is single, the abnormity and the fault type of the alternating current low-voltage power distribution unit cannot be accurately judged, and therefore the prevention and improvement measures for the alternating current low-voltage power distribution unit cannot be pertinently carried out.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a group's string formula photovoltaic power plant alternating current low voltage distribution unit monitoring diagnostic system, this system can carry out fault diagnosis to alternating current low voltage distribution unit.

In order to achieve the above purpose, the monitoring and diagnosing system of the string type photovoltaic power station AC low-voltage power distribution unit of the utility model comprises a processor, a current transformer, a voltage transformer, an arc light sensor, a temperature sensor and a measurement and control system, the device comprises a current acquisition module, a voltage acquisition module, an arc light detection module, a wire temperature acquisition module, a switch position and protection action acquisition module and an inverter state acquisition module, wherein the current acquisition module is used for detecting current signals of a boost low-voltage side incoming line and each group of serial branches through a current transformer;

the processor is connected with the inverter state acquisition module, the switch position and protection action acquisition module, the wire temperature acquisition module, the arc light detection module, the voltage acquisition module and the current acquisition module, and the processor is connected with the measurement and control system.

The system also comprises a time synchronization module, wherein the time synchronization module is connected with the processor.

The measurement and control system is connected with a touch screen.

The measurement and control system is connected with a memory.

The processor is connected with the inverter state acquisition module, the switch position and protection action acquisition module, the lead temperature acquisition module, the arc light detection module, the voltage acquisition module and the current acquisition module in a wireless communication or wired communication mode.

The processor is connected with the measurement and control system in a wireless communication or wired communication mode.

The measurement and control system is connected with an alarm system.

The measurement and control system is connected with an external upper computer.

The utility model discloses following beneficial effect has:

group string formula photovoltaic power plant alternating current low voltage distribution unit monitoring diagnostic system when concrete operation, the state signal of treater according to received dc-to-ac converter, the position and the protection action signal of switch, the temperature signal of electrical component, low voltage distribution system's arc light signal, the voltage of low pressure distribution generating line and low pressure branch voltage signal and step up the step-down and press side inlet wire and each group string branch's current signal to judge whether the low voltage distribution unit breaks down, and fault type and severity, and easy operation, it is convenient, simultaneously when actual operation, in time carry out the troubleshooting to the power plant alternating current low voltage distribution of photovoltaic according to the judged result, in order to guarantee equipment safety, steady operation.

Drawings

FIG. 1 is a view of the structure of the present invention;

fig. 2 is a wiring schematic of a low voltage power distribution system.

The system comprises a processor 1, an alternating current low-voltage power distribution monitoring, diagnosing and collecting device 2, a current collecting module 3, a voltage collecting module 4, an arc light detecting module 5, a wire temperature collecting module 6, a switch position and protection action collecting module 7, an inverter state collecting module 8, a time synchronizing module 9, a current transformer 10, a voltage transformer 11, an arc light sensor 12, a temperature sensor 13 and a measurement and control system 14.

Detailed Description

In order to make the technical solution of the present invention better understood, the following figures in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments, and do not limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

A schematic structural diagram according to an embodiment of the present disclosure is shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.

Referring to fig. 1 and 2, the monitoring and diagnosing system for ac low voltage power distribution unit of string-type photovoltaic power station of the present invention includes a processor 1, a current collecting module 3, a voltage collecting module 4, an arc light detecting module 5, a wire temperature collecting module 6, a switch position and protection action collecting module 7, an inverter state collecting module 8, a time synchronizing module 9, a current transformer 10, a voltage transformer 11, an arc light sensor 12, a temperature sensor 13, and a measurement and control system 14;

current acquisition module 3, voltage acquisition module 4, arc light detection module 5, wire temperature acquisition module 6, switch position and protection action acquisition module 7, dc-to-ac converter state acquisition module 8, to time module 9 integration for exchanging low voltage distribution monitoring diagnosis collection system 2, current transformer 10 installs on step-up step-down voltage side inlet wire and each group's cluster branch switch, voltage transformer 11 installs on low voltage distribution bus, temperature sensor 13 installs in cable inlet wire and female junction of arranging, arc light sensor 12 installs around the switch.

The current acquisition module 3 detects the current signals of the inlet wires at the low-voltage side of the booster and the branches of each group of strings through the current transformer 10;

the voltage acquisition module 4 measures voltage signals of a low-voltage distribution bus and a low-voltage branch through a voltage transformer 11;

the arc light detection module 5 detects arc light signals of the low-voltage distribution system through the arc light sensor 12, wherein the arc light signals of the low-voltage distribution system comprise arc lights generated by arc discharge and short circuit of a switch, a bus and a cable incoming line;

the lead temperature acquisition module 6 detects a temperature signal of an electrical component through a temperature sensor 13, wherein the electrical component comprises a cable, a switch and a bus bar;

the position of the switch and a protection action signal are collected through a switch position and protection action collecting module 7;

the inverter state acquisition module 8 acquires the state signal of the inverter, namely the inverter fault-free signal;

the signal of the time tick source is received by the time tick module 9.

The processor 1 is connected with the time setting module 9, the inverter state acquisition module 8, the switch position and protection action acquisition module 7, the wire temperature acquisition module 6, the arc light detection module 5, the voltage acquisition module 4 and the current acquisition module 3 in a wireless communication or wired communication mode, and the processor 1 is connected with the measurement and control system 14 in a wireless communication or wired communication mode.

The measurement and control system 14 is connected with a touch screen, and the type of the fault and whether the fault occurs are displayed through the touch screen; the measurement and control system 14 is connected with a memory and used for recording and storing through the memory; the measurement and control system 14 is connected with an alarm system; the measurement and control system 14 is connected with an external upper computer, and when a fault occurs, the alarm system gives an alarm, and meanwhile, a fault signal and a fault type are sent to the external upper computer to remind a worker.

When the photovoltaic power station works, the processor 1 judges whether the alternating-current low-voltage power distribution unit of the string-type photovoltaic power station has faults and the type and severity of the faults according to the state signals of the inverter, the position and protection action signals of the switch, the temperature signals of the electrical components, the arc signals of the low-voltage power distribution system, the voltage of the low-voltage power distribution bus, the low-voltage branch voltage signals, the voltage boosting low-voltage side incoming lines and the current signals of each string branch, and then sends the judgment results to the measurement and control system 14.

The utility model firstly collects, analyzes and stores data, and detects parameters such as current, bus voltage, electrical equipment operating temperature, switch position and the like of each branch when the equipment operates normally; when the voltage, current, temperature and other abnormal conditions occur, determining the type of the abnormal conditions, and recording the analog quantity and the switching quantity of the bus voltage, the current of each branch circuit, the switching position, the state of the inverter and the like when the abnormal conditions occur; when faults such as single-phase grounding, short circuit, overvoltage, disconnection, flashover and the like occur, the fault condition type is determined, the analog quantity and the switching quantity such as bus voltage, branch circuit current, switching position, inverter state and the like are recorded when the faults occur, and the fault type is judged. Meanwhile, the time synchronization module 9 provides the precise time when the abnormity and the fault occur.

Claims

1. The utility model provides a group's string formula photovoltaic power plant alternating current low voltage distribution unit monitoring diagnostic system, which characterized in that, including treater (1), current transformer (10), voltage transformer (11), arc light sensor (12), temperature sensor (13), measurement and control system (14), be used for detecting through current transformer (10) step-up low-voltage side inlet wire and each group cluster branching current signal's current acquisition module (3), be used for measuring voltage acquisition module (4) of low voltage distribution generating line and low-voltage branching's voltage signal through voltage transformer (11), be used for detecting arc light detection module (5) of low voltage distribution system's arc light signal through arc light sensor (12), be used for detecting wire temperature acquisition module (6) of the temperature signal of electrical component through temperature sensor (13), be used for gathering the position of switch and protection action signal's switch position and protection action acquisition module (7) and be used for gathering the state signal of inverter The inverter state acquisition module (8);

the processor (1) is connected with the inverter state acquisition module (8), the switch position and protection action acquisition module (7), the wire temperature acquisition module (6), the arc light detection module (5), the voltage acquisition module (4) and the current acquisition module (3), and the processor (1) is connected with the measurement and control system (14).

2. The group string photovoltaic power plant alternating current low voltage distribution unit monitoring and diagnosis system according to claim 1, characterized by further comprising a time synchronization module (9), wherein the time synchronization module (9) is connected with the processor (1).

3. The group string type photovoltaic power station alternating current low-voltage power distribution unit monitoring and diagnosing system as claimed in claim 1, wherein the measurement and control system (14) is connected with a touch screen.

4. The system for monitoring and diagnosing the series-wound AC low-voltage distribution units of the photovoltaic power station as set forth in claim 1, characterized in that the monitoring and control system (14) is connected with a memory.

5. The system for monitoring and diagnosing the alternating-current low-voltage power distribution units of the string-type photovoltaic power station as claimed in claim 1, wherein the processor (1) is connected with the inverter state acquisition module (8), the switch position and protection action acquisition module (7), the wire temperature acquisition module (6), the arc light detection module (5), the voltage acquisition module (4) and the current acquisition module (3) in a wireless communication or wired communication mode.

6. The monitoring and diagnosis system for the series-wound AC low-voltage distribution units of the photovoltaic power station as claimed in claim 1, wherein the processor (1) is connected with the measurement and control system (14) by means of wireless communication or wired communication.

7. The monitoring and diagnosis system for the series-wound photovoltaic power station alternating-current low-voltage power distribution units according to claim 1, characterized in that the measurement and control system (14) is connected with an alarm system.

8. The monitoring and diagnosing system for the alternating-current low-voltage distribution units of the string-type photovoltaic power station as claimed in claim 1, characterized in that the measurement and control system (14) is connected with an external upper computer.