KR101762742B1 - Combined energy management system and its operation method - Google Patents

Abstract

In the present invention, when the peak power exceeds the output capacity of the ESS without forcibly interrupting the load of the customer through the fusion-type energy management system combining the ESS and the FEMS, the peak management and the energy efficiency problem There is a purpose to solve,
For this purpose, in a hybrid energy management system using information of ESS and information of FEMS, charge / discharge command of PCS is executed based on accumulated time unit usage information of load inputted through FEMS to manage target power And a second peak control function for managing the target power by transmitting a power supply ON / OFF command to the gateway of the FEMS connected with the load in accordance with whether the target power is exceeded by the first peak control function Discloses a fused composite energy management system including an embedded EMS.

Description

Combined energy management system and its operation method

The present invention relates to the field of energy management system operation of ESS,

More specifically, for the purpose of maximizing the utilization range and effect of the ESS, a system and an algorithm capable of operating the customer FEMS and the ESS in a complex manner can be constructed. In this case, the application of the limited peak reduction by the power- Grid energy is about the technology that wants to increase its economic utilization value in the new industry.

Recently, the domestic energy demand has increased rapidly, resulting in the power shortage. In order to solve this power shortage problem, social costs are rising rapidly due to the addition of power generation and transmission and distribution facilities to supply electric power, and the supply of electric power is delayed. As a result, the government is shifting from past supply-oriented to demand management-oriented energy policies.

Demand management of power is a way to meet stable power demand at minimum cost through changing the pattern of power usage of consumers. Demand management of power can be divided into demand response and energy efficiency improvement. When applied to buildings, homes, and factories, this demand management can have a significant effect on energy demand management.

Recently, various smart grid technologies such as renewable energy such as solar power, LED lighting, ESS (Enery Storage System), electric vehicle and smit meter have been introduced into buildings, Market demand for BEMS (Building Energy Management System), HEMS (Home Energy Management System) and FEMS (Factory Management System) technologies is increasing.

In the case of factories, the power load is directly or indirectly related to production. To save electricity, various measures must be taken in real time in the process of using electricity, including manipulation of the power load. There is a problem that it is difficult to determine and implement the contents of various saving measures including screening of the target load that can be operated for electricity saving. Due to these difficulties, the factory has installed peak power reduction equipment (Demand Controller) or FEMS (Factory Energy Management System) to save electricity, especially peak.

However, the method of managing the peak power by forcibly blocking the electricity step by step causes inconvenience to the plant operation.

On the other hand, ESS is being used to manage the peak power of the consumer by discharging at a peak time when the ESS is started to be supplied and charged at a time when the energy consumption is low.

However, the ESS has a limited capacity of PCS and battery, so when the peak power is exceeded, the peak can not be caught.

Patent Registration No. 10-1243943 (Publication date March 13, 2013)

The present invention has been developed to meet the above-mentioned requirements. It is an object of the present invention to provide a FEMS system in which, when the peak power exceeds the output capacity of the ESS without forcibly blocking the load of the customer through the Fusion- Control algorithms to solve peak management and energy efficiency problems.

Other objects and advantages of the present invention will be described hereinafter and will be understood by the embodiments of the present invention. Further, the objects and advantages of the present invention can be realized by the means and the combination shown in the claims.

It is an object of the present invention to provide a hybrid energy management system using information of ESS and information of FEMS,
A first peak control function for managing a target power by performing a charging or discharging command of the PCS based on the set time unit cumulative usage amount information of the load inputted through the FEMS,
A second peak control function for managing a target power by transmitting a power supply ON / OFF command to a gateway of the FEMS connected to the load in accordance with whether the target power is exceeded by performing the first peak control function,
And an EMS having a third peak control function for managing a target power by transmitting a command selected from charging and discharging commands of the PCS and a power supply ON and OFF command to the gateway of the FEMS according to a predetermined schedule,
The PCS discharge command of the first peak control function is permitted when the power is within the set reverse power limit value,
The power supply OFF command of the second peak control function is differentially applied according to the priority of the load,
The first peak control samples the data at intervals of 1 second to manage the 15-minute cumulative usage of the load, compares the cumulative amount of use for 15 minutes of the load, which is changed at intervals of 1 second, and the target power, And a charging or discharging command is issued to the charging / discharging unit (120).

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According to the present invention, it is possible to more effectively process the peak reduction control operation by adding the load linkage information of the FEMS to the device interface layer portion of the EMS which is the operating system of the energy storage device (ESS). For this purpose, FEMS GW (Gateway) can be used to obtain load linkage information of FEMS. In addition, the FEMS GW can acquire information by directly connecting separate CT and PT sensors or by communicating with a digital watt-hour meter in order to obtain power information of loads.

In addition to acquiring power information through FEMS GW, addition of digital in / out module and analog in / out module can control breaker and switch, which improves customer's peak reduction function.

In addition, using the first and second peak control functions according to the present invention is effective for reducing the base charge, and using the third peak control function is effective for reducing the use charge of the electricity rate of the factory.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a fusion combined energy management system according to the present invention;
2 to 4 are views showing an example of a method of operating a fusion combined energy management system according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Accordingly, it is to be understood that the invention is capable of numerous changes, has various embodiments, and includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.

The terms first, second, etc. may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present invention, the terms "comprising" or "having ", and the like, specify that the presence of stated features, integers, steps, operations, elements, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be construed as meaning consistent with meaning in the context of the relevant art and are to be interpreted as ideal or overly formal in meaning unless explicitly defined in the present invention Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

FIG. 1 is a schematic configuration diagram of a fission combined energy management system 300 according to the present invention, and FIGS. 2 to 4 are views showing an example of a method of operating a fission combined energy management system 300 according to the present invention.

Referring to the drawings, the Fusion combined energy management system according to the present invention integrates an ESS operation algorithm and an FEMS scenario algorithm when performing automatic peak operation in EMS, which is an operating system of an energy storage system (ESS).

Here, the peak reduction algorithm checks the power consumption of a customer (for example, a factory) every 15 minutes in KEPCO, calculates the highest power consumption as a base charge, and assigns it to the customer in order to reduce the base charge or reduce the charge The ESS and the FEMS system control are performed according to the peak target value.

Specifically, the present invention discloses a fused composite energy management system and its operating method.

In the combined energy management system that utilizes the ESS information and the FEMS information, the Fusion combined energy management system performs charging or discharging command of the PCS based on the set time unit cumulative usage information of the load inputted through the FEMS, A second peak control function for managing a target power by transmitting a power supply ON / OFF command to a gateway of the FEMS connected to the load in accordance with whether the target power is exceeded by performing the first peak control function, And an EMS having a control function.

The EMS may further include a third peak control function for managing a target power by transmitting a command selected from a power supply ON / OFF command to the FEMS gateway, charging and discharging commands of the PCS, and the FEMS gateway according to a predetermined schedule.

Also, the PCS discharge command of the first peak control function may be permitted when the set power is within the set reverse power limit value.

In addition, the power supply OFF command of the second peak control function can be applied differently according to the priority of the load.

The operation method of the combined energy management system is a method of operating the combined energy management system using the information of the ESS and the information of the FEMS. In the method of charging the PCS based on the set time unit cumulative usage information inputted through the FEMS, A first peak control step of performing a discharge command to manage a target power; And a second peak control step of managing a target power by transmitting a power supply ON / OFF command to a gateway of the FEMS connected to the load in accordance with whether the target power is exceeded by performing the first peak control function.

The PCS discharge command of the first peak control step may be allowed when the set power is within the set back power limit value.

Also, the power supply OFF command of the second peak control step may be differentially applied according to the priority of the load.

Another example of the operation method of the combined energy management system is the operation method of the combined energy management system using the information of the ESS and the information of the FEMS, the charging and discharging command of the PCS, the command of the FEMS And a third peak control step of managing a target power by transmitting a command selected from power supply ON and OFF commands.

The first peak control function or step (hereinafter referred to as first peak control) is a peak control method using the ESS. To manage the basic charge, which accounts for a high percentage of the electricity price of the customer, the 15-minute cumulative usage should be managed by the EMS (330). This is a method in which the EMS 330 controls the peak by charging / discharging command to the PCS (power conversion apparatus 120) with appropriate time and output.

Specifically,

1) The first peak control samples data at intervals of 1 second to manage the cumulative usage for 15 minutes.

2) The cumulative average is calculated from the real-time data of the current load collected at intervals of 1 second, and the cumulative average of the last 900 real-time sampling data is used for 15 minutes.

3) The algorithm compares the calculated real-time cumulative average with the target maximum demand power to be managed by the customer and issues charge / discharge commands to the PCS 120 in 1-minute increments.

4) However, PCS output is not output every 1 minute, and it is judged whether to issue output command after checking various conditions.

5) If the current cumulative average is the maximum power of the PCS (120) within the 15-minute interval, the algorithm does not issue a discharge command for that period.

6) Whether or not to issue a discharge command is determined by parameters reflecting the characteristics of the customer such as the output coefficient.

7) algorithm, and does not output the output to the PCS 120 immediately after the output of the PCS 120 is calculated.

8) If it is determined that there is a possibility of generation of reverse power by discharging, the discharge output is readjusted so as not to exceed the set reverse power limit value.

9) The re-adjusted output may be divided into equal parts of the re-installed PCS 120, which may receive a discharge command, to the activated PCS 120. The PCS 120 may be provided with a plurality of PCS 120 So that the discharge can be performed.

The second peak control function or step (hereinafter referred to as second peak control) is a maximum power reduction control method using FEMS and can be performed through the following process.

1) If the power consumption of the customer exceeds the target demand power despite the first peak control (control using the ESS), an ON / OFF control command is sent to the FEMS GW (220,230) .

2) The algorithm collects the load data per second in order to manage the 15-minute cumulative usage and calculates the cumulative average to obtain the usage for 1 minute.

3) ON / OFF is determined based on the usage amount obtained for one minute. OFF logic operates when the target usage amount + OFF band interval value is larger than the immediately preceding maximum demand or when the usage amount is larger than the slope coefficient value for 1 minute immediately before.

4) The ON logic operates when the target usage-ON band interval value becomes smaller than the previous maximum demand.

5) The ON / OFF logic searches the devices (e.g., the air conditioner 221, the lighting device 222, the blower 231, the refrigerator 232, the compressor 233, the emergency generator 234, Turns the status ON or OFF. If the priority of the next device is the same as the priority of the current device, the corresponding device is turned ON or OFF

6) In the above section, the peak load reduction rate of the customer is maximized through the control operation of ESS and FEMS by repeatedly collecting the load data per second.

The third peak control function or step (hereinafter referred to as the third peak control) is a method of controlling the schedule operation, and may be performed through the following procedure.

1) The schedule operation control method is an operation control method that enables ESS charge / discharge command and FEMS command to shut off the load device with a predetermined schedule.

2) to allow the customer to view the power usage that is not suitable to use the automatic Peak Shaver control method (first peak control or second peak control), or to use it on a schedule that is registered to the customer's schedule It has its purpose.

3) If Peak Shaver control method is effective in reducing the base charge, the third peak control is effective in reducing the usage fee among the electricity bill of the customer.

4) It is possible to save the electricity bill of the customer by charging the battery at the light-duty hour and discharging the battery at the intermediate load or the maximum load time, where the electricity rate is relatively high.

5) The schedule operation control method allows the user to register and delete the charge / discharge schedule by day of the week.

6) If the ESS output is set and registered on the specified day of the week, the algorithm compares the current time with the registered schedule time to determine whether it is time to charge or discharge.

7) The charge / discharge start time and end time are periodically checked every 1 second. When the end time comes, all the schedules are terminated and the PCS 120 is switched to the standby mode.

8) The date designated as holiday is not scheduled operation. The algorithm also implements peak demand peaking, which increases the discharge power of the PCS 120 when using more power than the maximum demand set by the customer during the scheduled discharge operation.

9) If the corresponding output is larger than the set value of the customer, the control command is sent down in 1 minute. In order to minimize the influence on the entire schedule, the output is adjusted only when discharging.

10) and the output is readjusted to not exceed the point where the reverse power can be generated, and the readjusted output is distributed to the activated PCSs and finally the PCS outputs the output.

Referring to FIGS. 2 to 4, an exemplary method of operating a fusion energy management system according to the present invention will be described.

1. Collect the load data per second every second and calculate the cumulative average to calculate the usage for one minute.

2. Decide whether to turn ON / OFF based on the amount of usage for one minute.

3. The OFF logic operates when the target usage amount + OFF band interval value is larger than the immediately preceding maximum demand or when the consumption amount for 1 minute before is larger than the slope coefficient value.

4. The ON logic operates when the target usage-ON band interval value is less than the previous maximum demand.

5. The ON / OFF logic searches the device in priority order and turns the current state ON or OFF. If the priority of the next device is the same as the priority of the current device, turn on or off the device.

5. Go back to step 1 and collect the load data in seconds.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

110: PMS
210: FEMS
300: Combined energy management system

Claims (8)

In the integrated energy management system using information from ESS and information from FEMS,
A first peak control function for managing a target power by performing a charging or discharging command of the PCS based on the set time unit cumulative usage amount information of the load inputted through the FEMS,
A second peak control function for managing a target power by transmitting a power supply ON / OFF command to a gateway of the FEMS connected to the load in accordance with whether the target power is exceeded by performing the first peak control function,
And an EMS having a third peak control function for managing a target power by transmitting a command selected from charging and discharging commands of the PCS and a power supply ON and OFF command to the gateway of the FEMS according to a predetermined schedule,
The PCS discharge command of the first peak control function is permitted when the power is within the set reverse power limit value,
The power supply OFF command of the second peak control function is differentially applied according to the priority of the load,
The first peak control samples the data at intervals of 1 second to manage the 15-minute cumulative usage of the load, compares the cumulative amount of use for 15 minutes of the load, which is changed at intervals of 1 second, and the target power, 120) is charged or discharged.
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