KR20210153924A - Energy Management System - Google Patents

Abstract

The present invention relates to an active energy management system (EMS) for synchronizing energy storage system (ESS) facilities, and more specifically, to a system for monitoring, controlling, efficiently managing, and operating apparatuses such as an ESS, a power conversion apparatus, a solar power generator and the like. Furthermore, the EMS of the present invention confirms data communication through an interlinked test among the ESS facilities, an actively controlled gateway for synchronizing the ESS facilities, and a driver for developing and installing the EMS, tests data accuracy by comparing ESS facility data with communicated data through a facility driver, and tests and verifies data accuracy by comparing ESS facility data with communicated data through the facility driver. In addition, a system of diagnosing, dealing with, and operating a state of an element facility for accident prevention and facility safety of the solar power generator and ESS diagnoses and deals with only state information on operating facilities and professionally and instantly takes actions against risky factors in an ESS operating environment, thereby preventing a fire or other accidents to come up with measures against damage to the property and the environment which are continuously occurring. The EMS of the present invention comprises a management unit for a solar power generator and a battery, a solar power generator, a battery, a measurement unit, a control unit, a gateway, a data storage unit, a power conversion unit, and a load unit.

Description

Active energy management system for ESS facility synchronization {Energy Management System}

The present invention relates to an active energy management system (EMS) for ESS facility synchronization, and in particular, a system for monitoring and controlling devices (ESS, power conversion device, solar power generation device, etc.), and efficiently managing and operating them is about

Furthermore, check whether data communication exists through interworking tests between ESS facilities and an active control gateway for synchronization of ESS facilities and EMS development facility drivers,

Data accuracy test through comparison between ESS facility data and communication data through facility driver,

Data accuracy is tested and verified through comparison between ESS facility data and communication data through facility drivers.

In addition, the solar tube power generation system, the element facility condition diagnosis response operation system for prevention of ESS accidents and facility safety diagnoses and responds only to the condition information of operating facilities, and responds professionally and immediately to risk factors in the ESS operating environment to prevent fire or By preventing other accidents in advance, we intend to come up with alternative measures for continuously occurring property and environmental damage.

- Existing ESS operation technology is intensively dependent on PMS and EMS.

- Existing ESS operation technology is being operated in the direction of maximum efficiency and various monitoring methods, which are closely related to profits.

-As a result, while ESS power plants are rapidly increasing due to national policies and support, fire/explosion and continuous occurrence are occurring. are doing

In the background of the announcement that the ESS operation system malfunctions as a result of the analysis of a fire or explosion accident, it is determined that the present invention is essential to the improvement of the operation method as well as the improvement of the operation system.

In order to ensure that the ESS, which is currently an issue due to an accident, can operate normally, a method for safe operation is essential.

The system of the present invention is not a concept to replace the existing system, but it is intended to prevent accidents by intensively responding to errors by linking products that can professionally diagnose and respond to element facilities.

The system of the present invention applies EMS to provide maximum efficiency power generation/transmission, charging/discharging and at the same time providing ESS safety, thereby contributing to the normalization of the ESS market, normalization of ESS operation, normalization of renewable energy generation, and normalization of profits.

For reference, in general, a charger is required to store energy in a battery using a system or other energy source. The charger is used to charge energy required by the battery. In order to charge the battery, the voltage and current of the battery pack are required to be sensed, and the battery is charged using the detected voltage and current information.

Due to the characteristics of the battery, a separate Battery Management System (BMS) is required to manage the battery in terms of stability. In general, a battery is constituted by a battery pack comprising a plurality of battery cells, for applying a low cell voltage to the system.

The battery is configured as a pack to apply a low battery cell voltage to the system for the purpose of protecting the battery cell itself. In this case, when the battery is configured as a pack, a separate protection is required. Overcurrent detection is required.

On the other hand, an energy storage system (Energy Storage System, ESS) performs a function of storing power generated in a system in a battery or supplying power stored in the battery to a system or a load. That is, a power conversion device for an energy storage system

(Power Converter System, PCS) supplies power required by the system, and the operation of the power supply may be controlled by the power converter itself, or a higher level control such as a separate battery management system or power management system It can also be controlled using

However, such a conventional ESS operation technology is intensively dependent on PMS and EMS. As a result, when a problem occurs in the ESS, an error occurs in the PMS and EMS systems and fails to respond, leading to fire.

As devised in view of the above conventional problems,

The present invention relates to an active energy management system (EMS) for ESS facility synchronization, and in particular, a system for monitoring and controlling devices (ESS, power conversion device, solar power generation device, etc.), and efficiently managing and operating them is about

Furthermore, check whether data communication exists through interworking tests between ESS facilities and an active control gateway for synchronization of ESS facilities and EMS development facility drivers,

It provides a technology to test data accuracy through comparison between ESS facility data and communication data through facility drivers, and to test and verify data accuracy through comparison between ESS facility data and communication data through facility drivers.

Looking at the embodiment of the present invention, sensor application for voltage/current measurement before/after the CB switch (including the circuit of the solar power box)

- Application of sensor for temperature measurement of CB busbar (circuit)

- Application of TCP communication converter to collect sensing data of gateway

- Serial or Modbus protocol-based sensing data communication protocol implementation

-Real-time sensing data communication

- ESS operation power supply and cut-off function through CB sensing data collection and analysis data-based boundary value comparison.

- Danger event detection and processing technology through CB sensing real-time measurement

- Event detection and processing technology through CB current measurement

The monitoring part of each device (ESS, power conversion device, solar power generation device, etc.) is summarized through the measurement unit.

1) Primary risk detection through real-time CB current and voltage measurement, 2) Environmental condition temperature measurement

3) Determination of current continuity through comparison between the derived current value analysis data and real-time detection data

4) When the result of the current value is derived, the manager event notification occurs and a warning situation occurs when the current value continues;

5) Real-time analysis of busbar temperature rise,

6) In case the temperature rise angle is outside the ESS operation allowable range, the ESS power is cut off;

Event detection and processing through CB voltage measurement;

1) CB switch front and rear voltage measurement and voltage deviation analysis (when over a certain current)

2) Resistance component analysis by voltage measurement area using voltage deviation

3) Deduction of normal/abnormal (warning) judgment results through measurement error judgment and usable range analysis and comparison of internal resistance component levels

4) In case of abnormal judgment, ESS operation power is cut off;

As described above, it is a beneficial invention such as accident prevention and facility safety by providing an operation system that responds to element facility condition diagnosis for ESS accident prevention and facility safety that can be additionally applied separately from EMS operated at the ESS site to diagnose the condition of element facilities. .

In addition, EMS operation service is operated through grid power, solar power generation power, and battery power, and operation method setting for various algorithms (DR operation, pattern analysis operation, power consumption setting operation, TOU operation, schedule operation) It can be said to be a beneficial invention by providing

1 is a block diagram showing an active energy management system (EMS) for ESS facility synchronization according to an embodiment of the present invention;
Figure 2 is a reference diagram showing the data interworking and accuracy test of the present invention
3 is a block diagram showing an active energy management system (EMS) for ESS facility synchronization according to an embodiment of the present invention;
4 is a reference diagram showing an active control gateway S/W platform for ESS facility synchronization of the present invention.

Hereinafter, with reference to the accompanying drawings, the configuration will be looked at and exemplary embodiments thereof will be described as follows.

- Build new and renewable energy sources (solar power generation) and distributed power ESS system facilities suitable for the appropriate system capacity derived from the photovoltaic power generation device, building load data collection and analysis results

Build solar power generation equipment, power conversion equipment, and battery equipment according to the design capacity results

Install batteries of appropriate capacity for battery operation according to peak power or TOU (hourly rate plan)

·Apply the battery charge/discharge function for battery operation according to peak power or TOU (hourly rate plan).

·Data accuracy test and verification through comparison between ESS facility data and communication (A600) data through facility driver.

· Prepare an optimal operation plan for ESS facilities through data collection and analysis through linking between facilities and DB (A700).

Looking at the application of EMS control and ESS operation technology based on TOU (hourly rate system) according to the usage rate system of the present invention, the EMS operation technology for each operation algorithm is,

- Application of TOU-based EMS control and ESS operation function according to usage plan

TOU setting through EMS Battery operation control function for each operating time

Power supply through battery discharge through ESS operation for TOU setting time

- EMS control and ESS operation function according to DR protocol-based demand response command through EMS

Derivation of power system cut-off time period through DR protocol analysis received from VTN

Power supply through battery discharge according to power system shutdown time through EMS

- EMS control and ESS operation function according to power consumption upper limit setting

Power consumption upper limit setting function applied through EMS

Battery discharge/stop operation based on the applied EMS upper limit power

Supply power consumption through discharging the battery only for power exceeding the upper limit of power

- EMS control and ESS operation function based on power consumption pattern analysis

Power consumption pattern analysis result data based on power consumption collection data

Deduction of power load class based on data based on pattern analysis result (light load, heavy load, maximum load)

Application of ESS operation function according to power load class

Light load, heavy load: operation of power consumption through grid power and solar power generation

1) Grid power single load: Solar power is used as battery charging power

2) Grid power and solar power generation power load: When the battery is fully charged

·Maximum load: operation of power consumption through grid power, solar power generation power, and battery power

- Provide EMS operation service through operation method setting for various algorithms (DR operation, pattern analysis operation, power consumption setting operation, TOU operation, schedule operation)

go further ESS Accident Prevention and Facility Safety Response Operation System for Element Equipment Status Diagnose and respond only to the status information of operating facilities to prevent fire or other accidents in advance by responding professionally and immediately to risk factors in the ESS operating environment. We intend to come up with alternative measures for continuously occurring property and environmental damage.

- In addition, it is intended to prevent abnormal operation of the ESS due to communication errors through the communication diagnosis of the power meter to prevent damage to the profits of the power generation company.

In addition, the system can be applied to all ESS sites as well as new power plants as it is possible to diagnose the condition of element facilities by additionally applying the system separately from the EMS operated at the ESS site.

In addition, not only solar power, but also system diagnosis and response by connecting to various other renewable energy-linked ESSs such as power conversion devices to which core element facilities of ESS (battery) are applied, wind power, hydrogen, hydro power, bio, etc. to which batteries (ESS) are applied can do.

The corresponding system of the present invention will be described as an example. (See Fig. 3)

The battery management unit of the present invention (corresponding to the symbol A100 as a facility condition diagnosis response system) is a BMS (Battery management system) and an energy storage device.

It is linked with a communication network (Network HUB) to manage the temperature and charge state of the battery A200.

In addition, the battery manager A100 may identify and manage battery information in addition to the temperature and charge state of the battery A200 .

The present invention consists of a solar power generation device and a battery management unit, a solar power generation device, a battery, a measurement unit, a control unit, a gateway, a data storage unit, a power conversion unit, and a load unit.

Meanwhile, the battery management unit A100 may manage the entire battery A200 for each rack unit, so that the degree of deterioration may be estimated for each rack unit.

The battery A200 is an energy storage device, which is operated by the control unit A500 and is charged and discharged through the power conversion unit A400 . In addition, the battery (A200) is a large-capacity energy storage device, it is configured to include a plurality of racks (Rack), it can be operated for each rack unit of the battery (A200).

The measurement unit A300 measures a voltage value and a current value for the entire battery A200 acquired during charging and discharging of the battery A200 . In detail, when charging and discharging are performed through the power conversion unit A400, the measuring unit A300 has a voltage value for the entire battery A200, and a voltage change value during charging and discharging, that is, the voltage for the current change amount. change can be measured.

The power converter A400 is a PCS (Power Converter System), and is a device for converting alternating current into direct current or direct current into alternating current. It may include a relay function to stop the power supply according to the presence or absence of an abnormality in the power system.

In addition, the power change unit A400 may connect the battery A200 and the controller A500 to charge and discharge the battery A200 .

In detail, the power conversion unit A400 may convert the DC current stored from the battery A200 into AC to supply power to the power system or directly supply power to the AC load. Also, AC power from the power system may be converted into DC and stored in the battery A200.

Based on the voltage value and current value of the entire battery A200 received from the measuring unit A300 and the temperature and charging state of the battery A200 received from the battery management unit A100, the control unit A500 is configured to The overall degree of deterioration of the battery A200 may be estimated.

In this case, the controller A500 may calculate the internal resistance of the battery A200 by Ohm's law based on the voltage and current values for the entire battery A200 received from the measurement unit A300 .

That is, the control unit A500 sets the initial internal resistance value of the entire battery A200 as a reference, and compares this with the internal resistance value calculated by the control unit A500 to cause overall deterioration of the battery A200. can be estimated.

At this time, the control unit A500 divides the battery A200 by the temperature and the state of charge (SOC) input from the battery management unit A100 to estimate the overall degree of deterioration of the battery A200. It is possible to set the internal resistance value standard for the whole of (A200). That is, the current degree of deterioration is estimated by setting the internal resistance value of the entire battery A200 in the initial state as a reference value for each temperature and each state of charge, and comparing it with the internal resistance value measured in consideration of the temperature and state of charge compared to the reference value. can do.

Here, the internal resistance value of the battery 200 may vary depending on the temperature and the charging state of the battery A200 . Accordingly, the temperature and charge state information may be received through the battery manager A100, and the degree of deterioration may be estimated based on the information of the battery manager A100 and the measurement unit A300.

Meanwhile, in estimating the degree of degradation of the battery A200 , the degree of degradation may be calculated as a specified value according to the degradation state of the battery 200 . In the method of calculating the degree of degradation, a separate calculation logic is used. A method of calculating the degree of deterioration,

It can also be calculated using a table in which the deterioration value corresponding to the relationship between the reference value of the internal resistance and the measured internal resistance is defined.

In addition, in estimating the degree of degradation, the degree of degradation may be continuously estimated from the battery A200 in real time or may be estimated at a predetermined period.

Also, the controller A500 may calculate the total capacity and output value of the battery 200 based on the total deterioration degree of the battery A200 .

At this time, a lookup table for the total capacity and output value of the battery A200 according to the overall deterioration degree of the battery A200 is stored in advance in a memory (not shown), and the controller A500 controls the total deterioration degree of the battery A200 It is possible to calculate the total capacity and output value of the battery A200 according to

Through this, by calculating the total capacity and output value of the battery A200 based on the overall deterioration degree of the battery A200, it can be utilized as important information in operating and diagnosing the state diagnosis apparatus of the energy storage device.

In addition, the control unit A500 may include a reliability determining unit (not shown) to determine the reliability of the measured deterioration degree.

The controller A500 may diagnose the apparatus for diagnosing the state of the energy storage device based on the overall deterioration degree of the battery A200 estimated above and the deterioration degree of the battery A200 measured by the battery manager A100. Through this, energy storage system (ESS)

It is possible to determine whether there is an abnormality in the state diagnosis apparatus of the , and the overall deterioration degree of the battery A200 and the deterioration degree of the battery A200 measured by the battery management unit A100 may be selectively used according to the presence or absence of the abnormality.

A photovoltaic device, not shown, combines a plurality of photovoltaic panels separately connected to a plurality of groups of circuits, a plurality of input terminals, a plurality of fuses and circuit breakers, a plurality of diodes, and the power output from the plurality of diodes into one. It is composed of a connection panel including an output terminal to

Communication, when it is determined that the operation processing result of the control unit is abnormal, a wireless module for transmitting to the mobile communication terminal 40 of the administrator or user using WAP;

Through the wireless module and the existing mobile communication network, the remote administrator or user transmits the specific number of the small group of the energy storage device to the mobile communication terminal of the remote location, the alarm text determined in response to the abnormal state, and the measurement data stored in the storage device. By sending it to the , it is possible to know from a remote location which small group of energy storage devices is in an abnormal state.

Briefly describing the active operation of such a remote monitoring system, the remote monitoring

When a desired administrator or user runs an application program installed in the mobile communication terminal to access the control unit and transmits a status check request to the control unit, the control unit controls the current or past results extracted by the status check request from the manager or user is transmitted to the administrator or user's mobile communication terminal.

In this embodiment, by using the WAP (Wireless Application Protocol) that is installed in the mobile communication terminal of the controller and the administrator or the user and enables wireless data communication between the two devices, remote monitoring can be performed without additional equipment. .

WAP acts as a communication emulator, and according to a predetermined protocol, it converts a signal received and demodulated from the other party into meaningful information. allows you to monitor

A100; solar power plant
A200; Solar power plant, battery (ESS)
A300 ; measuring part
A400 ; power conversion device
A500 ; control
A600 ; communication
A700 ; DB receive data

Claims (1)

In the photovoltaic power generation device and battery management unit, solar power generation device, battery, measuring unit, control unit, gateway, data storage unit, power conversion unit, consisting of a load unit,

A photovoltaic power generation device and battery (ESS) management unit that can manage the entire solar power plant and battery A200 by rack unit, and can estimate the degree of deterioration for each rack unit;
A photovoltaic device for generating power, an ESS for receiving power from the photovoltaic device, storing power and outputting the stored power, a power conversion unit for converting power of the ESS, the photovoltaic device, and the ESS A measuring unit that measures power, voltage, power generation, charging and discharging values;
The battery A200 based on the voltage and current values of the entire battery A200 received from the measuring unit A300 and the temperature and charging state of the battery A200 received from the battery management unit A100 a control unit for estimating and controlling the overall degree of deterioration of
An active energy management system for ESS facility synchronization, characterized in that it comprises a data storage unit for storing the measured values measured from the measuring unit.

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