Microgrid monitoring system

Abstract

The utility model provides a micro-grid monitoring system. The micro-grid monitoring system comprises a PCS data monitoring device, a battery BMS data monitoring device, a photovoltaic inverter data monitoring device, a video monitoring device and a DI / DO switching value module which are respectively connected to a switch through RS485 communication lines, the air conditioner data monitoring device, the electric energy meter, the grid-connected cabinet electric energy meter and the temperature and humidity transmitter are respectively connected to the serial server through RS485 communication lines; the switch and the serial port server are in communication connection with the local controller, and the local controller is used for collecting real-time state information of the micro-grid monitoring system; the local display screen is connected with the local controller through an RS485 communication line; the battery BMS data monitoring device is also in communication connection with the PCS data monitoring device; the local controller is in communication connection with the monitoring host EMS, and the monitoring host EMS is in communication connection with the large display screen.

Description

Technical Field

[0001] The utility model belongs to the technical field of microgrids, and in particular relates to a microgrid monitoring system. Background Art

[0002] At present, microgrids at home and abroad are still in an "unattended" operation and management mode. During the operation of the entire power transmission and distribution system, the equipment running in the microgrid system is in a long-term working state, and various conditions are inevitable. Once a failure occurs in the operating equipment, it may cause a power outage at the least, or even damage the energy storage equipment, causing high temperature of the equipment to cause fire and explosion, and causing power outages in large areas of industrial areas, which seriously affects the dispatch of microgrid energy and causes serious economic losses.

[0003] In order to realize remote management and automated monitoring of microgrids and meet the “unattended” operation and management mode of microgrids, the existing technology provides monitoring solutions, such as: CN215186086U distributed microgrid monitoring system, including a controller, a monitoring device, a server and a monitoring device; the controller is used to communicate with the generator set of the power grid, and the controller is used to collect real-time status information of the generator set; the RS485 port of the controller is connected to the monitoring device, and the monitoring device is communicated with the server; the server is communicated with the monitoring device. The above-mentioned distributed microgrid monitoring system can realize remote monitoring of the real-time status of the power grid. However, this solution only focuses on distributed communication to realize remote monitoring, and does not involve the collection of specific on-site data status, etc.

[0004] Purpose of the Invention

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The utility model provides a microgrid monitoring system, comprising:

[0007] Monitoring host EMS, display screen, local controller, switch, serial port server, local display screen, PCS data monitoring device, battery BMS data monitoring device, photovoltaic inverter data monitoring device, video monitoring device, DI / DO switch module, air conditioning data monitoring device, energy meter, grid cabinet energy meter and temperature and humidity transmitter;

[0008] The PCS data monitoring device, the battery BMS data monitoring device, the photovoltaic inverter data monitoring device, the video monitoring device and the DI / DO switch quantity module are respectively connected to the switch through network cables;

[0009] The air conditioning data monitoring device, the electric energy meter, the grid cabinet electric energy meter and the temperature and humidity transmitter are respectively connected to the serial port server through RS485 communication lines;

[0010] The switch and the serial port server are in communication connection with the local controller, and the local controller is used to collect real-time status information of the microgrid monitoring system;

[0011] The local display screen is connected to the local controller via an RS485 communication line;

[0012] The battery BMS data monitoring device is also in communication connection with the PCS data monitoring device;

[0013] The local controller is connected to the monitoring host EMS through network communication, and the monitoring host EMS is connected to the large display screen through network communication.

[0014] Based on the above, the DI / DO switch quantity module is respectively connected to the switch quantity input ports of the monitoring unit emergency stop button signal, the grid cabinet remote opening indication signal, the grid cabinet remote closing indication signal, the container emergency stop button signal, the container emergency door I signal, the container emergency door II signal, the container flooding signal, the gas extinguishing disk fault signal, the fire alarm signal, the fire spray signal, the combustible gas fault signal, the combustible gas low concentration alarm signal and the combustible gas high concentration alarm signal.

[0015] Based on the above, the temperature and humidity transmitter is connected to the inverter chamber temperature sensor to collect the inverter chamber temperature and humidity.

[0016] Based on the above, the battery BMS data monitoring device is connected to the battery stack and the battery cluster, and is used to collect the battery stack voltage, battery stack current, battery stack SOC, battery stack SOH, operating temperature, battery stack real-time charge and discharge power, maximum battery voltage, minimum battery voltage, and maximum and minimum single cell voltage and its battery number, maximum battery temperature, minimum battery temperature, and maximum and minimum single cell temperature and its battery number, stack charge capacity, and stack discharge capacity;

[0017] It is also used to collect the current, voltage, power, battery energy, chargeable capacity, cumulative charge and discharge capacity of the battery cluster, as well as the highest and lowest single cell voltage and its battery number;

[0018] It is also used to collect fault alarm and protection action signals.

[0019] Based on the above, the PCS data monitoring device is connected to the switch quantity and analog quantity input port of the PCS to collect switch quantity information and analog quantity information; wherein,

[0020] The switch quantity information includes the status of the contactors and circuit breakers on the DC side and the AC side, the grid-connected and off-grid operation modes, the charging, discharging and standby operation states, and the status of the local operation handle;

[0021] The analog quantity information includes voltage, current and power on the DC side, and three-phase voltage, current, active power and reactive power on the AC side.

[0022] Based on the above, the air conditioning data monitoring device is used to collect the operating status of the air conditioning unit, compressor start-up temperature, compressor stop return difference, heater start-up temperature, heater stop return difference, high temperature alarm temperature in the cabinet and low temperature alarm temperature in the cabinet.

[0023] Based on the above, the photovoltaic inverter data monitoring device is connected to the switch quantity and analog quantity input port of the photovoltaic inverter, and is used to collect the three-phase voltage, three-phase current, total power generation, total power generation time, power generation on the same day, power generation time on the same day, grid frequency, output active power, output reactive power and power factor of the photovoltaic equipment;

[0024] It is also used to collect the internal temperature of the inverter, the temperature of the inverter radiator, and fault alarm signals.

[0025] The utility model has substantial features and progress compared with the prior art, specifically:

[0026] The utility model can monitor the voltage, current, power and other electrical parameters of the equipment through real-time monitoring of PCS, battery BMS, photovoltaic inverter, air conditioner, video, electric energy meter, fire fighting equipment, etc., and can upload all monitoring data to realize remote monitoring of basic operation information of microgrid operation equipment, so that maintenance personnel can obtain the operation status of equipment in real time, realize remote fault warning, and start or stop equipment in time according to the actual operation status. The utility model enables maintenance personnel to find problems at the first time, thereby maximizing the reduction of accident risks and property losses, ensuring the stable and reliable operation of microgrid operation equipment, further realizing the goal of intelligent distribution network, and meeting the operation and management mode of "few people on duty" of microgrid.

[0027] Instruction Manual

[0028] Figure 1 It is a schematic diagram of the system structure of the utility model.

[0029] Figure 2 It is a collection circuit principle diagram of the DI / DO switch quantity module of the utility model. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0031] like Figure 1-Figure 2 As shown, this embodiment provides a microgrid monitoring system, including: a monitoring host EMS, a display screen, a local controller, a switch, a serial port server, a local display screen, and a PCS data monitoring device for collecting real-time status information of the microgrid monitoring system, a battery BMS data monitoring device, a photovoltaic inverter data monitoring device, a video monitoring device, a DI / DO switch quantity module, an air conditioning data monitoring device, an electric energy meter, a grid-connected cabinet electric energy meter, and a temperature and humidity transmitter.

[0032] The PCS data monitoring device, the battery BMS data monitoring device, the photovoltaic inverter data monitoring device, the video monitoring device and the DI / DO switch quantity module are respectively connected to the switch through network cables;

[0033] The air conditioning data monitoring device, the electric energy meter, the grid cabinet electric energy meter and the temperature and humidity transmitter are respectively connected to the serial port server through RS485 communication lines;

[0034] The switch and the serial port server are in communication connection with the local controller, and the local controller is used to collect real-time status information of the microgrid monitoring system;

[0035] The local display screen is connected to the local controller via an RS485 communication line;

[0036] The battery BMS data monitoring device is also in communication connection with the PCS data monitoring device;

[0037] The local controller is connected to the monitoring host EMS through network communication, and the monitoring host EMS is connected to the large display screen through network communication.

[0038] In this embodiment, the monitoring host EMS can adopt a server device based on Java technology, which has the advantages of large storage capacity, safety and reliability, and strong data processing.

[0039] Collection function

[0040] 1) DI / DO switch quantity module can upload the collected data to the local controller through Modbus TCP communication;

[0041] Used to collect monitoring unit emergency stop button signals, grid cabinet remote opening indication signals, grid cabinet remote closing indication signals, container emergency stop button signals, container emergency door I signals, container emergency door II signals, container flooding signals, gas extinguishing panel fault signals, fire alarm signals, fire spray signals, combustible gas fault signals, combustible gas low concentration alarm signals and combustible gas high concentration alarm signals.

[0042] 2) Temperature and humidity transmitter, using 485 type temperature and humidity transmitter, connected to the inverter room temperature sensor, used to collect the inverter room temperature and humidity; using Modbus-RTU communication protocol to upload the collected data to the local controller.

[0043] 3) Battery BMS data monitoring device, communication method RJ45, protocol format is Modbus-TCP communication protocol; used to collect:

[0044] a) Battery stack voltage, battery stack current, battery stack SOC, battery stack SOH, operating temperature, battery stack real-time charge and discharge power, maximum battery voltage, minimum battery voltage, as well as the maximum and minimum single cell voltage and their battery number, maximum battery temperature, minimum battery temperature, as well as the maximum and minimum single cell temperature and their battery number, stack chargeable capacity, stack dischargeable capacity;

[0045] b) The current, voltage, power, battery energy, chargeable capacity, cumulative charge and discharge capacity of the battery cluster, as well as the highest and lowest single cell voltages and their battery numbers;

[0046] c) Fault alarm and protection action signal.

[0047] 4) The PCS data monitoring device, with communication mode RJ45 and protocol format Modbus-TCP communication protocol, is used to collect:

[0048] a) Switching information includes the status of contactors and circuit breakers on the DC and AC sides, grid-connected and off-grid operation modes, charging, discharging and standby operation status, and the status of the local operating handle;

[0049] b) Analog information includes voltage, current and power on the DC side, and three-phase voltage, current, active power and reactive power on the AC side.

[0050] 5) Air conditioning data monitoring device, communication mode RS485, protocol format is Modbus-RTU communication protocol; used to collect:

[0051] Air conditioning unit operating status, compressor start temperature, compressor stop return difference, heater start temperature, heater stop return difference, cabinet high temperature alarm temperature and cabinet low temperature alarm temperature.

[0052] 6) Electric energy meter, communication mode RS485, protocol format is Modbus-RTU communication protocol, used to collect: photovoltaic ABC three-phase voltage, ABC three-phase current, ABC three-phase active power, total active energy, etc.;

[0053] 7) Grid-connected cabinet electric energy meter, communication mode RS485, protocol format is Modbus-RTU communication protocol, used for collecting: real-time measurement of bus three-phase voltage, three-phase current, power, frequency and other parameters;

[0054] 8) Photovoltaic inverter data monitoring device, communication mode RS485, protocol format is Modbus-RTU communication protocol, used to collect:

[0055] a) Three-phase voltage, three-phase current, total power generation, total power generation time, power generation on the day, power generation time on the day, grid frequency, output active power, output reactive power and power factor of photovoltaic equipment;

[0056] b) Inverter internal temperature, inverter heat sink temperature, and fault alarm signal.

[0057] 9) Video monitoring device, communication method RS485, protocol format is Modbus-RTU communication protocol, used to collect video of the operating environment status of the battery compartment and energy storage inverter room, support Internet services, and realize remote video viewing.

[0058] Display functions

[0059] The large display screen is placed in the remote monitoring center to display the working status parameters and real-time alarm information of the connected equipment uploaded by the local controller, operation buttons such as power on / off, power dispatch, grid connection and disconnection, contactor opening and closing, and historical alarm records.

[0060] The local display screen is placed in the microgrid to display the working status parameters and real-time alarm information of the connected equipment, display operation buttons such as power on / off, power dispatch, grid connection and disconnection, contactor opening and closing, and display historical alarm records.

[0061] Communication functions:

[0062] All collected data, alarm information, and operation (result) data should be reported to the monitoring host EMS in real time when the monitoring host EMS is in networking state. In other embodiments, in the remote control mode, the connected device can also accept control commands from the monitoring host EMS.

[0063] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A microgrid monitoring system, characterized in that: include: Monitoring host EMS, display screen, local controller, switch, serial port server, local display screen, PCS data monitoring device, battery BMS data monitoring device, photovoltaic inverter data monitoring device, video monitoring device, DI / DO switch module, air conditioning data monitoring device, energy meter, grid cabinet energy meter and temperature and humidity transmitter; The PCS data monitoring device, the battery BMS data monitoring device, the photovoltaic inverter data monitoring device, the video monitoring device and the DI / DO switch quantity module are respectively connected to the switch through network cables; The air conditioning data monitoring device, the electric energy meter, the grid cabinet electric energy meter and the temperature and humidity transmitter are respectively connected to the serial port server through RS485 communication lines; The switch and the serial port server are in communication connection with the local controller, and the local controller is used to collect real-time status information of the microgrid monitoring system; The local display screen is connected to the local controller via an RS485 communication line; The battery BMS data monitoring device is also in communication connection with the PCS data monitoring device; The local controller is connected to the monitoring host EMS through network communication, and the monitoring host EMS is connected to the large display screen through network communication.

2. The microgrid monitoring system according to claim 1, characterized in that: The DI / DO switch quantity module is respectively connected to the switch quantity input ports of the monitoring unit emergency stop button signal, the grid cabinet remote opening indication signal, the grid cabinet remote closing indication signal, the container emergency stop button signal, the container emergency door I signal, the container emergency door II signal, the container water flooding signal, the gas extinguishing disk fault signal, the fire alarm signal, the fire spray signal, the combustible gas fault signal, the combustible gas low concentration alarm signal and the combustible gas high concentration alarm signal.

3. The microgrid monitoring system according to claim 1, characterized in that: The temperature and humidity transmitter is connected to the inverter chamber temperature sensor and is used to collect the inverter chamber temperature and humidity.

4. The microgrid monitoring system according to claim 1, characterized in that: The battery BMS data monitoring device is connected to the battery stack and the battery cluster, and is used to collect the battery stack voltage, battery stack current, battery stack SOC, battery stack SOH, operating temperature, battery stack real-time charge and discharge power, maximum battery voltage, minimum battery voltage, and maximum and minimum single cell voltage and battery number, maximum battery temperature, minimum battery temperature, and maximum and minimum single cell temperature and battery number, stack charge capacity, and stack discharge capacity; It is also used to collect the current, voltage, power, battery energy, chargeable capacity, cumulative charge and discharge capacity of the battery cluster, as well as the highest and lowest single cell voltage and its battery number; It is also used to collect fault alarm and protection action signals.

5. The microgrid monitoring system according to claim 1, characterized in that: The PCS data monitoring device is connected to the switch quantity and analog quantity input port of the PCS and is used to collect switch quantity information and analog quantity information; wherein, The switch quantity information includes the status of the contactors and circuit breakers on the DC side and the AC side, the grid-connected and off-grid operation modes, the charging, discharging and standby operation states, and the status of the local operation handle; The analog quantity information includes voltage, current and power on the DC side, and three-phase voltage, current, active power and reactive power on the AC side.

6. The microgrid monitoring system according to claim 1, characterized in that: The air conditioning data monitoring device is used to collect the operating status of the air conditioning unit, the compressor starting temperature, the compressor stopping return difference, the heater starting temperature, the heater stopping return difference, the high temperature alarm temperature in the cabinet and the low temperature alarm temperature in the cabinet.

7. The microgrid monitoring system according to claim 1, characterized in that: The photovoltaic inverter data monitoring device is connected to the switch quantity and analog quantity input port of the photovoltaic inverter, and is used to collect the three-phase voltage, three-phase current, total power generation, total power generation time, power generation on the same day, power generation time on the same day, grid frequency, output active power, output reactive power and power factor of the photovoltaic equipment; It is also used to collect the internal temperature of the inverter, the temperature of the inverter radiator, and fault alarm signals.

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