KR20190092721A - Power management system for controlling energy storage system - Google Patents

Abstract

The present invention relates to load control of a wireless-based maximum demand power management device and, more specifically, to a maximum power management system which installs an energy storage system (ESS) in a distribution board of a power consumer and efficiently controls and operates the same. According to the present invention, the maximum power management system comprises: a power meter repeatedly generating a demand time limit pulse by a predetermined time unit when supplying power needed to a power consumer or a building; a maximum power management device receiving standard time data synchronized to operation control time of KEPCO, synchronizing time information for charging and discharging control of a power storage system based on the received standard time data and generating charging time control information / discharging time control information synchronized to the demand time limit pulse generated from the power meter; and a power storage system charging the power provided from KEPCO to a battery or discharging the charged power based on the charging time control information / discharging time control information generated from the maximum power management device.

Description

Maximum power management system that controls and operates the ESS at a time synchronized with the KEPCO electricity meter {POWER MANAGEMENT SYSTEM FOR CONTROLLING ENERGY STORAGE SYSTEM}

The present invention relates to ESS charging and discharging load control as a wireless time server-based maximum power management device, and more specifically, installed in the switchgear of the power consumer to efficiently control and operate an energy storage system (ESS). It relates to a maximum power management system.

The maximum power management device is a device that enables power management within a target power range through stepwise load blocking (control) when there is a risk of exceeding the target power by monitoring or predicting the maximum demand power of the user.

In recent years, power consumption is increasing rapidly in daily life and in society and factories. In particular, when demand for air-conditioning equipment is amplified, such as midsummer or midwinter, energy demand exceeds supply. Therefore, the government is trying to regulate the supply and demand of electricity by limiting its use even while setting the usage fee according to the electricity use time. The maximum power management device is installed and used to control the stable supply and demand of power through the management of the maximum demand power of each power consumer.

Patented power control method as described above In WO2013125909, an apparatus and method for scheduling a power storage device have been proposed. The patent is characterized by building an efficient power storage method by communicating with a plurality of nodes to control each power storage device periodically.

In addition, Patent Application Publication No. 10-2017-0073916 has proposed a control method of the energy storage system. The patent allows the battery to be fully charged in the charging section, and automatically controls the battery to be completely discharged in the discharge section, thereby appropriately adjusting the operation of the load.

However, the above patents are only characterized in that the power storage system communicates with a plurality of nodes to control each power storage system periodically.

In addition, the apparatus and method for controlling the power storage system as described above merely discloses a configuration for controlling the charge and discharge of the power storage system.

Therefore, in the present invention, when the power storage system is installed in the switchgear of the power consumer in which the maximum power management device is installed, there is a need to optimize the power usage fee through efficient management of the power storage system.

In particular, the maximum power management device is configured to predict the maximum demand power and maintain below the target power by using a pulse signal of 15 minutes interval generated from the electricity meter. However, when the pulse signal of the electricity meter and the power storage system installed in the switchgear cannot be synchronized, the power usage fee cannot be optimized.

Accordingly, an object of the present invention is to provide a maximum power management system for installing a power storage system in the switchgear of the power consumer, and controls the power storage system for efficient power reserve ratio.

Another object of the present invention is to provide a maximum power management system using control information synchronized with a pulse signal generated by a power meter of KEPCO in controlling the charge / discharge operation of a power storage system installed in a power switchgear. .

In order to solve the above technical problem, the maximum power management system according to an embodiment of the present invention, when supplying the power required for the customer or building, power meter for repeatedly generating a time-demanded pulse in a predetermined time unit; Receive the standard time data synchronized with the operation control time of KEPCO, synchronize the time information for charge and discharge control of the power storage system based on the received standard time data, and charge in synchronization with the demand time pulse generated from the electricity meter A maximum power management device for generating time control information / discharge time control information; And a power storage system configured to charge the battery provided by the KEPCO or discharge the charged power based on the charge time control information / discharge time control information generated by the maximum power management device.

The maximum power management apparatus is configured to charge time synchronized with a demand time pulse generated in the electricity meter when time information for charge control of the power storage system synchronized with the standard time is included in a light load time zone of KEPCO. Control the charging of the power storage system during the control information period,

The maximum power management device, the discharge time in synchronization with the demand time pulse generated in the electricity meter when the time information for the discharge control of the power storage system synchronized with the standard time is included in the maximum load time zone of the KEPCO And controlling discharge of the power storage system during a control information period.

Preferably, the standard time data received by the maximum power management device is received from a time server synchronized with the time information of KEPCO,

The process of synchronizing time information for charging and discharging control of a power storage system in the maximum power management device may be performed selectively among season units, monthly units, daily units, and user setting units.

Preferably, the maximum power management device is connected to a low voltage relay for monitoring a power supply abnormal state of the KEPCO, and a reverse phase relay connected between the KEPCO supply power and the power storage system to monitor the occurrence of a reverse transmission state, the low voltage relay And detecting charge and discharge control of the power storage system when an abnormal state is detected from the reverse phase relay.

Preferably, the apparatus further comprises a monitoring unit remotely connected to the maximum power management device and configured to monitor a control signal input and a charge / discharge operation state for charge / discharge control of the power storage system.

Preferably, the maximum power management device, the installation place of the power storage system in the internal memory, the capacity of the power storage system, the operating conditions of the power storage system (for peak reduction, heavy load or discharge of the maximum load time zone, emergency Power supply expansion, peak reduction, and heavy load or discharge for maximum load time) can be updated and stored, and the charge / discharge control of the power storage system is performed based on the stored value.

The maximum power management system according to an embodiment of the present invention is to install a power storage system in a switchgear of a building or a power consumer, and to efficiently distribute the power supplied to the load by using the commercial power and the charging power of the power storage system. It features. Therefore, the present invention enables efficient power usage according to the tariff system set by KEPCO.

In addition, the maximum power management system of the present invention is characterized in using the time control data synchronized with the pulse signal generated from the power amount of the KEPCO in controlling the charge and discharge operation of the power storage system. Therefore, the present invention has the effect of preventing the error of time control that may occur due to the time delay or the like due to the aging of the electronic device. Above all, the present invention controls the power usage of the power consumer to be synchronized with the KEPCO.

1 is an overall configuration diagram of a maximum power management system for charge and discharge control of a power storage system according to an embodiment of the present invention.
2 is a flowchart illustrating an operation of synchronizing and controlling a power storage system in a maximum power management device according to an embodiment of the present invention.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, and the same or similar components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. The suffix "part" "apparatus" for components used in the following description is given or mixed in consideration of ease of specification, and does not have meanings or roles that are distinct from each other.

In addition, in describing the embodiments disclosed herein, when it is determined that the detailed description of the related known technology may obscure the gist of the embodiments disclosed herein, the detailed description thereof will be omitted. In addition, the accompanying drawings are intended to facilitate understanding of the embodiments disclosed herein, but are not limited to the technical spirit disclosed herein by the accompanying drawings, all changes included in the spirit and scope of the present invention. It should be understood to include equivalents and substitutes.

Terms including ordinal numbers such as first and second 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.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprises" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention.

1 is a block diagram of a maximum power management device for controlling a power storage system according to an embodiment of the present invention.

The maximum power management apparatus 300 of the present invention receives the standard time data from the time server 200 and uses the time data. Therefore, the maximum power management device 300 includes a communication unit 340 capable of transmitting and receiving standard time data wirelessly or by wire with the time server 200. The communication unit 340 preferably receives a signal including standard time data from the time server 200 at a predetermined interval. Alternatively, the communication unit 340 requests standard time data from the maximum power management device 300 to the time server 200 for the charge / discharge control operation of the power storage system 100, and the time server 200. It is also possible to receive standard time data from.

The time server 200 generates a standard time synchronized with the operation control time of KEPCO (hereinafter referred to as KEPCO). Therefore, the time server 200 may be described as a time server of KEPCO. The KEPCO electricity meter 400 to be described below uses a time synchronized with the operation control time of KEPCO. Therefore, the standard time of the time server 200 may be described as coinciding with the time information used in the KEPCO 400.

The operation control time of the KEPCO is used as time information in the KEPCO, and means the time used as a reference in calculating the usage fee of each power customer in KEPCO.

For example, KEPCO sets the light load time from 11 pm to 9 am, sets the minimum power for this time period, and induces the light load time.

During the period from March to October, the maximum load time is set from 10 am to 12 am and from 1 pm to 5 pm. During the period from November to February, the maximum load time is set from 10 am to 12 pm, 5 pm to 8 pm, and 10 pm to 11 pm. In the maximum load time zone set in this way, the power consumption is set at the maximum unit price, leading to the lowest power usage in the maximum load time zone.

And setting the time zones other than the light load time zone and the maximum load time zone as the intermediate load time, and using the unit price that is set higher than the unit cost of the light load time zone and lower than the unit cost of the maximum load time zone. Calculating fee.

As such, the operation control time for calculating the rate of KEPCO is different for each time zone, and in calculating the power usage fee of each electric power customer, it is based on the time information used in KEPCO.

This is because a difference may occur between time information used in the power storage system of each power consumer and time information used in the KEPCO. Due to the characteristics of electronic devices, delay time may occur and an error may occur in time information. However, KEPCO will cumulatively calculate the power consumption of each customer based on the operation control time that is set as a standard.

Accordingly, in the present invention, the power storage system 100 may be configured by using the standard time corresponding to the operation control time used by the KEPCO and the charge / discharge time control information generated in synchronization with the 15 minute pulse signal of the electricity meter 400. Characterized in that the charge and discharge control.

The maximum power management device 300 of the present invention is associated with the electricity meter 400. The electricity meter 400 accumulates and accumulates the power supplied to a customer or a building, and displays power consumption, and calculates an electric power demand time limit pulse (EOI) and an electricity usage pulse (WP: Watt hour pulse). Provided to the management device (300). Therefore, the maximum power management device 300 is connected to the wattmeter 400 to calculate the maximum demand power and the target power by inputting the power demand time limit pulse and the electricity consumption pulse to calculate the maximum amount of power, by using the Used to manage power. In particular, the power demand time pulse (EOI) output from the electricity meter 400 in units of approximately 15 minutes is used as a synchronization signal when controlling the charging and discharging of the power storage system in the present invention.

Accordingly, the maximum power management device 300 receives the synchronous time generation unit 310 for receiving the power demand time pulse and the electricity usage pulse to generate charge / discharge time control information for charge / discharge control of the power storage system 100. Include.

The synchronous time generation unit 310 generates charging time control information for controlling the charging of the power storage system 100 using the power demand time pulses generated at the 15 minute intervals. In addition, the synchronous time generation unit 310 generates discharge time control information for controlling the discharge of the power storage system 100 by using the time demand pulse generated in the 15-minute interval.

In addition, the synchronization time generation unit 310 receives the standard time of the time server 200, and matches the time information of the maximum power management device 300 and the time information of the power storage system 100 to the standard time. . In addition, the synchronous time generation unit 310 loads using power under the control of the maximum power management device 300 (not shown), the configuration of the operation is controlled under the control of the maximum power management device 300 ( Control to match the time information of the low voltage relay, reverse phase relay, etc. to the standard time.

The time information of the maximum power management device 300 refers to time information used when controlling various operations in the maximum power management device 300. The time information of the power storage system 100 refers to time information used in controlling the charge and discharge operation in the power storage system 100.

The synchronization process of synchronizing the time information of the standard time and the maximum power management device 300 and the power storage system 100 in the synchronization time generation unit 310 may be performed by season, month, day, and user request. Can be executed by user set unit. Alternatively, the synchronization process may be performed when the light load time zone, the intermediate load time zone, and the maximum load time zone are changed. Alternatively, when the government policy is changed, the synchronization process can be performed at the time when this is reflected.

In general, when supplying power required for a customer or building, the KEPCO electricity meter 400 provides a power amount pulse and a power demand time pulse to the maximum power management device 300. The power demand time limit pulses are output at regular demand time intervals. For example, pulses are output at the time of 0 minutes 0 seconds, 15 minutes 0 seconds, 30 minutes 0 seconds, and 45 minutes 0 seconds. Therefore, the maximum power management device 300 measures the power demand of the customer or building at intervals of 15 minutes in synchronization with the pulse.

Accordingly, the maximum power management device 300 converts the output pulse of the electricity meter 400 into digital data to integrate the amount of power, monitor whether the target power (peak power or maximum power) is exceeded, and exceed the target power. When the power supply of the load is sequentially controlled according to a predetermined algorithm, the power supply is adjusted to control the power supply so as not to exceed the peak amount of power.

In the illustrated configuration, the maximum power management apparatus 300 shows only a configuration for controlling supply and interruption of the KEPCO power source 600 to the power storage system 100, but is not limited thereto. Since the maximum power management device 300 is basically configured to control the maximum power of the power consumer, it includes a control configuration for controlling the opening and closing of the power supplied to other loads connected to the power consumer. In addition, while monitoring the amount of power used does not exceed the target power, and stores a control algorithm for sequentially blocking and controlling the power supplied to the load.

The maximum power management device 300 also stores a control algorithm for power switching of loads when the power supplied to the power consumer uses only KEPCO power, when the power storage system is used together with the KEPCO power.

The maximum power management device 300 includes an input / output unit 320 and a signal output unit 330 in addition to the configuration of the synchronization signal generator 310. In addition, the communication unit 340 includes an interface function to interface with load devices. In addition to these configurations, the peak power management apparatus 300 naturally includes control configurations for monitoring peak demand power and target power. In the present invention only in the charge and discharge control of the power storage system 100, the time-synchronized control, and the charge and discharge control operation of the power storage system 100 in the event of a power failure or reverse transmission occurring in the KEPCO This will be described.

The input / output unit 320 controls the charge circuit breaker 140 for power supply when the power storage system 100 is charged, and a signal for controlling the discharge circuit breaker 130 operating when the power storage system 100 is discharged. Outputs The input / output unit 320 inputs a signal for monitoring whether the charging circuit breaker 140 and the discharge circuit breaker 130 are normally operated from the charging circuit breaker 140 or the discharge circuit breaker 130. It is also possible. In this case, the charging circuit breaker 140 or the discharge circuit breaker 130 may be detected through an energized current, an energized voltage, or the like.

The signal output unit 330 is configured to provide the power control device 110 with various control signals for the charge control algorithm and the discharge control algorithm of the power storage system 100. At this time, the charge control algorithm and the discharge control algorithm may be a reference configuration. In addition, by synchronizing the 15-minute synchronization signal of the electricity meter 400 with the reference configuration, the time information data newly generated for the charge / discharge control of the power storage system 100 in the maximum power management device 300, that is, the standard time data. The synchronization information generator 310 may further include time information data generated by the synchronization time generator 310.

The communication unit 340 is used to receive information related to the current charge remaining amount of the battery 120, the charge control amount in the charging process, the discharge control amount in the discharge process, and the like, and may use the 485 communication interface. In addition, the communication unit 340 may be provided with state information of the power converter 110.

The present invention is connected to the maximum power management device 300 through the RS-232 or LAN (LAN) to remotely monitor the entire operation of the maximum power management device 300, a remote monitoring unit for providing a control signal if necessary 500. The maximum power management device 300 may communicate with the remote monitoring unit 500 through a communication unit 340 by a wireless signal.

The remote monitoring unit 500 may use a mobile communication terminal having a personal computer function. The remote monitoring unit 500 is configured to monitor all operations controlled through the maximum power management device 300 through wireless communication with the maximum power management device 300. Alternatively, the app interworking with the maximum power management device 300 may be installed in the remote monitoring unit and monitored in the remote monitoring unit 500.

The maximum power management device 300 of the present invention controls the power storage system 100 is installed in the switchgear of the power consumer. In particular, as described above, the power storage system 100 is controlled in synchronization with the power demand time pulse (EOI) of the electricity meter 400.

The power storage system 100 is installed in the switchgear of the power consumer to receive power from the KEPCO and store the power, when the demand power is expected to exceed the maximum demand power, or when a power supply other than KEPCO temporarily to the grid power supply, Discharge the stored power to regulate the power demand of the building.

The power storage system 100 charges the KEPCO 600 or discharges stored power under the control of the maximum power management device 300. Therefore, the maximum power management device 300 controls the charge breaker 140 and the discharge breaker 130 for discharging the internal power of the power storage system 100.

The power storage system 100 includes a power conversion system (PCS). The power converter 110 converts the DC power stored in the battery 120 into AC to supply power to the power system or converts AC power supplied from the power system into DC to control the storage in the battery 120. .

The power converter 110 communicates with the outside and includes a control unit 115 (POWER MANAGEMENT SYSTEM) (PMS) for controlling the power converter. Similarly, the battery 120 also communicates with the outside, and includes a control unit 125 (BATTERY MANAGEMENT SYSTEM) (BMS) for controlling the battery.

The control unit 115 of the power converter 110 may transmit and receive the necessary information with the maximum power management device 300. The controller 125 of the battery 120 may transmit / receive necessary information with the maximum power management device 300.

Accordingly, the maximum power management device 300 may use RS-485 communication with the control unit 125 of the battery 120. In addition, the maximum power management device 300 may use RS-485 communication with the control unit 115 of the power conversion device 110. To this end, the maximum power management device 300 performs an RS-485 communication interface with the power converter 110 and the battery 120 through the communication unit 340.

The maximum power management apparatus 300 may receive and manage the charge data and the discharge data of the power converter 110 through communication with the control unit 115 of the power converter 110. In addition, the maximum power management device 300 is provided with the state data of the battery through communication with the control unit 125 of the battery 120 to be managed.

On the other hand, the synchronous time generation unit 310 in the maximum power management device 300 of the present invention, the charge and discharge time control of the power storage system 100 in synchronization with the power demand time pulse (EOI) of the electricity meter 400 Generate data.

As mentioned above, the price of electricity is set differently according to the time of use.

In other words, the base rate, light load time zone rate, medium load time zone rate, and maximum load time zone rate are set differently. Therefore, the light load time zone uses a lot of commercial power, and the maximum load time zone uses a small amount of commercial power. It is effective for calculating the fee.

In addition, the electricity meter 400 calculates the demand power as the average power used during the demand time limit, and in Korea, 15 minutes is used as the demand time. Thus, four demand power data are measured every hour for each customer, and the maximum demand power for any period represents the maximum of these demand power.

According to this basic setting, the electric charges used in each customer are different depending on which time period they are using, even if they use the same amount of power, and the price also varies according to the maximum demand power. Therefore, in order to save the maximum electric bill in the consumer, the maximum demand power should not be increased, and above all, the contract power should be managed so as not to be exceeded.

The maximum power management device 300 should store such basic setting values in an internal memory (not shown). In addition, an algorithm for control operation according to each time slot should be stored. For example, the algorithm for charging control of the power storage system 100 should be stored in the light load time zone. And the algorithm for controlling the discharge of the power storage system 100 in the maximum load time should be stored.

The discharge control algorithm of the power storage system 100 includes a configuration for enabling the discharge amount to be arbitrarily set (10% to 50%) so as not to be completely discharged based on the remaining charge level.

When the charge control algorithm of the power storage system 100 is based on 24 hours a day, it is preferable to perform a charge control operation at a light load time zone. And the algorithm for the charge control or the algorithm for discharge control is configured so that the maximum demand power stored in the maximum power management device 300 does not rise, and the contract power is not exceeded.

In addition, the maximum power management device 300 uses the time data generated by the synchronization time generation unit 310 in performing the charging control algorithm. That is, the synchronous time generation unit 310 determines whether the current time is the light load time zone, the medium load time zone or the maximum load time zone based on the standard time data received from the time server 200. In order to control the charging of the power storage system 100, new control time data generated in synchronization with the power demand time pulse (EOI) of the electricity meter 400 is generated. The new control time data generated at this time is used as time control information for charging control of the power storage system 100.

In this case, the synchronous time generation unit 310 includes a predetermined delay time until the ESS 100 is applied to the ESS 100 after generating a pulse signal from the power meter 400 in the time control information for the charging control. It will be possible to calculate the delay time in a number of tests, and generate time control information for charge control including the calculated delay time.

In addition, the maximum power management device 300 uses the time data generated by the synchronous time generation unit 310 in performing the discharge control algorithm. That is, the synchronous time generation unit 310 determines whether the current time is the light load time zone, the medium load time zone or the maximum load time zone based on the standard time data received from the time server 200. In order to control the discharge of the power storage system 100, new time data generated in synchronization with the power demand time pulse (EOI) of the electricity meter 400 is generated. The new time data generated at this time is used as time control information for discharge control of the power storage system 100.

At this time, the synchronous time generation unit 310 includes a predetermined delay time from the power meter 400 to the ESS 100 after the pulse signal is generated in the time control information for the discharge control. It will be possible to calculate the delay time in a number of tests, and generate time control information for discharge control including the calculated delay time.

In addition, the maximum power management device 300, in addition to the time control information for the charge and discharge control, in performing other operation control of the power storage system 100 in the synchronization time generation unit 310, the power meter 400 It is possible to generate time control information synchronized with the EOI pulses of and to perform the control based thereon. In particular, in a control operation in which the charge of the amount of power used may be optimized, it is preferable to perform the operation of synchronizing with the output pulse of the wattmeter 400.

In addition to the time control information for controlling the power storage system 100, the maximum power management apparatus 300 synchronizes time with the EOI pulse of the electricity meter 400 that is available in performing control operations of other devices. It is possible to use control information. That is, the maximum power management device 300, based on the standard time information received from the time server 200 in performing each control operation for efficiently managing the power used, the power meter 400 It is possible to receive and use the time control information synchronized with the pulse signal of the synchronous time generation unit 310.

Reference numeral 150 denotes a low voltage relay and 160 denotes a reverse phase relay. The low voltage relay has a general function, detects abnormality of the KEPCO supply power, provides an alarm signal to the maximum power management device 300, so that the control of the maximum power and the charge / discharge control of the ESS 100 can be efficiently performed. Make it happen. The reverse phase relay has a general function and is installed between the KEPCO supply power and the power storage system to detect an occurrence of reverse transmission and provide an alarm signal to the maximum power management device 300. In particular, when detecting an abnormality in the KEPCO supply power from the low voltage relay 150, the charge and discharge operation of the power storage system 100 is blocked. Likewise, when reverse transmission is detected from the reverse phase relay 160, the charge / discharge operation of the power storage system 100 is blocked.

In addition to such a configuration, the maximum power management device 300 preferably controls the charging and discharging of the power storage system 100, and applies control requirements according to government policy.

For example, in the case of installing and using the power storage system, if the charge of the power storage system is controlled during the light load time period, a system of discounting 50% of the electricity usage fee is implemented until 2020. In addition, by installing and using an electric power storage system, a system that discounts the base rate, which is three times the peak reduction amount, will be implemented until 2020. As such, the government policy according to the use of electric power may change, and it is preferable to store the control value according to the government policy in the internal memory and apply it to the charge / discharge control of the electric power storage system.

In addition, in consideration of the storage capacity of the power storage system and the average demand power of each power customer, it is possible to calculate the charge and discharge possible time of the power storage system, to reduce peaks, discharge heavy load or maximum load time zone, expand the emergency power supply In addition, it is possible to selectively control the peak reduction and the heavy load or the discharge during the maximum load time period from the mixed use. In addition, it is possible to select the optimal charge and discharge control according to the installation space (public institution, school, general building, industrial, etc.) where the power storage system is installed and used.

The peak reduction effect is to reduce the peak power by controlling the discharge for a predetermined time or more (approximately 2 hours) during the maximum load using time by using the storage capacity of the power storage system, further reducing the base charge due to the peak reduction To get. At this time, in performing the control for reducing the peak, the discharge control of the power storage system should be performed at the maximum load using time based on the standard time.

The heavy load or the maximum load time zone discharge, so as to control the discharge for a predetermined time (about 4 hours) or more at the corresponding time to obtain the effect of reducing the use charge of the heavy load and the maximum load time zone. In this case, the heavy load time zone or the maximum load time zone must be coincident with the standard time, and the effect thereof is maximized. Similarly, in performing the control for discharging, it is preferable to use the discharge time control information synchronized with the 15-minute pulse of the watt-hour meter.

The emergency power expansion is a capacity set for emergency power generation by a power consumer, and sets a constant discharge amount (approximately 2 hours) of the power storage system for emergency power.

At this time, it is desirable to establish and use an annual optimal charge and discharge plan for each power customer. That is, it is preferable to establish an optimal charge / discharge plan based on daily or monthly load patterns, and perform control accordingly. Of course, for this purpose, it is necessary to store and use information such as capacity, charge / discharge possible time, peak time, light load time zone, heavy load time zone, maximum load time zone, and the like of the power storage system. Therefore, the internal memory of the maximum power storage device is configured to store the above information and to update and store the changed information.

In particular, information such as light load time zone, heavy load time zone, and maximum load time zone, which are set in association with government policy, can be changed and can be controlled to be received and stored remotely (wireless) through the monitoring unit. .

The following describes the operation of the maximum power management system according to the present invention made up of the above configuration.

2 is a flowchart illustrating an operation for controlling charging and discharging of a power storage system in a maximum demand power management system according to the present invention.

First, the electricity meter 400 is pre-installed in the power distribution panel of the power consumer. The cumulative integration of the power used by the customer is performed, and the result is converted into a power demand end pulse (EOI) and a power usage pulse (WP: Watt hour pulse) and outputted to the maximum power management device 300. .

Similarly, the maximum power management device 300 is a wireless communication or wired communication and electricity, such as time server 200, remote monitoring unit 500, electricity meter 400, power storage system 100, etc. to control the overall configuration of the present invention. The control is connected to enable.

The KEPCO power supply 600 is a system power supply, and supplies power required for a power consumer. In addition, the KEPCO power supply 600 is controlled to be charged to the power storage system 100 under the control of the maximum power management device 300, the power of the power stored in the power storage system 100 under the control of the maximum power management device (300). The discharge is controlled.

The maximum power management device 300 accumulates and accumulates the maximum demand power of the power used in the building and the power consumer according to the pre-stored power management algorithm using two pulse signals provided by the electricity meter 400, Check the power (810).

In addition, in controlling the pre-stored power management algorithm, the maximum power management device 300 performs appropriate control by applying power management based on a power rate system and power management based on weather information. In this process, the maximum power management device 300 checks the light load time zone, the heavy load time zone, the maximum load time zone in the power bill system of KEPCO. The information on the load time zone is based on a value stored in a memory (not shown), but it is also possible to update or use the latest information or directly input it (812).

The maximum power management device 300 reads the battery 120 state information in order to control the charging and discharging of the ESS 100. This brings the necessary information through communication with the battery 120 control unit 125 (814).

The process 814 may be described as a process of confirming in advance before the charge / discharge control of the battery to determine whether the battery can be charged, whether the battery can be discharged, and whether the battery is abnormal.

Also, the maximum power management device 300 determines whether the power supply 600 of the KEPCO is in a normal state from the low voltage relay 150 and the reverse phase relay 160 before controlling the charging of the battery 120. That is, it is determined whether the battery is normal in step 816, and by checking the data of the reverse phase relay 160 in step 818, 820, it is determined whether the battery is in a normal state capable of charging or discharging.

In operation 822 and 824, the data of the low voltage relay 150 is checked to determine whether the KEPCO is in a normal state available for charging the battery.

When it is determined that there is no problem in controlling the charging and discharging of the battery 120 through the above process, the maximum power management apparatus 300 performs a control operation for the charge / discharge control of the ESS 100.

First, the synchronous time generation unit 310 of the maximum power management device 300 repeatedly receives standard time information from the time server 200 at regular intervals, and then controls charging and discharging operations of the power storage system 100. The reference time information is used (826).

In step 826, the synchronous time generation unit 310 determines whether the time information inside the maximum power management device 300 matches the standard time, and based on the standard time, time information of the maximum power management device 300 is determined. Synchronize.

Similarly, the synchronization time generation unit 310 determines whether the time information inside the power storage system 100 coincides with the standard time, and synchronizes the time information of the power storage system 100 based on the standard time. To this end, the maximum power management apparatus may perform communication through the power storage system 100 and the communication unit 340, and control the time information of the power storage system to match the standard information.

In addition, the synchronization time generation unit 310 may synchronize the time information of all the loads being operated under the control of the maximum power management device 300 to the standard time.

In addition, the synchronization time generation unit 310 inputs a power demand time pulse output from the power meter 400 at a predetermined interval (15 minutes), and charges the power storage system 100 synchronized with the power demand time pulse. Or generate charge and discharge time control information to control the discharge (830).

On the other hand, the maximum power management device 300 stores the time information associated with the light load time zone, the intermediate load time zone, the maximum load time zone and the control information to be performed in each time zone, the price is set differently according to the use time zone, When the load time zone is to provide a control signal associated with the power storage system 100.

The power storage system 100 is most preferably made of a charge control for storing the power in the battery 120 during the light load time is set the lowest price. Therefore, when the current time reaches a time corresponding to the light load time zone (832), the maximum power management device 300 controls the breaker 140 for charging the power storage system 100 to the battery 120 The power source 600 is controlled to be charged (834).

Importantly, the current time determined by the maximum power management apparatus 300 is based on the time information of the maximum power management apparatus matched to the standard time as mentioned above. That is, the current time of the maximum power management device 300 and the current time of the KEPCO means a state in which the same.

Also important is that charging is controlled in synchronization with the power demand time pulse output from the electricity meter 400. That is, when the maximum power management device 300 controls the charge breaker 140 of the power storage system 100, when the light load time zone is reached, the maximum power management device 300 uses the charge time control information synchronized with the power demand time pulse. The charge breaker 140 of the power storage system 100 controls the state of charge. In this way, the battery 120 can be charged by receiving the KEPCO power source 600 using the charging time control information synchronized with the power demand time pulse at 15 minute intervals in the light load time zone.

As described above, when the charge of the power storage system 100 is controlled in synchronization with the power demand time pulse generated at the 15-minute interval generated by the electricity meter 400, the power meter 400 accumulates power consumption in 15 minutes, and power storage. The charge control time of the system 100 is equally synchronized. In addition, the charging control of the power storage system 100 is made within the same time range without departing from the light load time zone in which charges of KEPCO are settled. Through such control, the charging control of the power storage system is performed in the light load time zone, which is the lowest charge time zone in the KEPCO, and thus it is possible to control the power usage charges generated therefrom to the minimum.

Even while the battery 120 is being charged, the state information of the battery 120 is monitored by transmitting and receiving battery state information between the control unit 125 of the battery 120 and the communication unit 340 of the maximum power management device 300. And management takes place.

Similarly, the state information according to the power conversion and the charge control is monitored and managed through the transmission and reception of the charge control information between the control unit 115 of the power conversion device 110 and the communication unit 340 of the maximum power management device 300.

In this way, the charge control time and the discharge control time are accurately synchronized with the generated pulse of the KEPCO 400 for the following reasons. This is because the standard of charge / discharge compensation of the power storage system in KEPCO is based on the time synchronized with the electricity meter 400 of KEPCO. Similarly, since the calculation of the electricity usage fee is based on the time of the electricity meter 400 of KEPCO, it is possible to settle the standard time synchronized with the KEPCO electricity meter to control the charge / discharge of the power storage system 100 to obtain the optimal electricity use charge. Done.

The maximum power management device 300 remotely provides the remote monitoring unit 500 with information on the charging control operation and the battery state of the power storage system 100, so that the remote monitor (manager) can save the power storage system 100. ) To monitor the charging operation.

Next, the maximum power management apparatus 300, when the current time reaches the maximum load time zone (832), the control operation is set to be performed to the maximum load time zone. Typically, the charging operation of the power storage system 100 is not preferable at the maximum load time. In general, the maximum load time zone is set to the most expensive power consumption. Therefore, it is desirable to avoid the charging control operation of the power storage system 100 that is used to secure the reserve power and to selectively use in the maximum load time zone.

Therefore, the maximum possible load time zone can not be limited to the part used to receive the KEPCO power supply 600 from the building or the customer, but the charging operation of the power storage system 100, except when charging is required by the administrator's emergency request, etc. Limit. The charging request by the administrator's emergency request may be generated by providing an interrupt signal to the maximum power management apparatus 300 through the remote monitoring unit 500.

However, the discharge operation of the power storage system 100 at the maximum load time is very efficient. That is, when the current time reaches the maximum load time zone, the maximum power management apparatus 300 may discharge and use the power charged in the power storage system 100 by using part or all of the power required by the power consumer. Control (836). At this time, it is preferable to preset the amount for discharge in advance.

In this case, the maximum power management device 300 is based on the standard time information received from the time server 200, the power storage system 100 by synchronizing the pulse signal of 15 minutes intervals output from the electricity meter 400 Generate discharge time control information for controlling the discharge operation of the < Desc / Clms Page number 5 >

The configuration of generating time information includes generating time information for controlling a charging operation of the power storage system 100 and generating time information for controlling a discharge operation of the power storage system 100. It can be explained by doing.

Therefore, the breaker 130 for discharging the power storage system 100 based on the time control information for the discharging operation of the power storage system generated in synchronization with the pulse signal of the electricity meter 400 in the maximum power management device 300. Control the operation of

At this time, the power of the battery 120 is discharged during the discharge control time is provided to the place where the power customer or the power of the building is required, and thus the power consumer or building at the maximum load time using the KEPCO power source 600, while at the same time the battery 120 It is possible to use together the power that was charged. That is, it can be adjusted to use the KEPCO power to the minimum amount of power required by the building in the maximum load time zone.

As described above, the present invention is configured to control the charging and discharging operations of the power storage system 100 under the control of the maximum power management device 300 in synchronization with the pulse signal generated by the electricity meter 400.

This is the case of the high-voltage water price to install and use the electricity meter 400, the base rate is determined by the monthly maximum power. The electricity meter 400 calculates the average power for 15 minutes by the amount of power accumulated every 15 minutes, and sets the largest monthly value as the maximum power of the month to use the charge calculation.

Therefore, the maximum power management device 300 predicts the maximum demand power based on the output signal of the electricity meter 400, and manages the power consumption of the load such as heating and cooling to be maintained below the target power.

In addition, the maximum power management device 300 controls the charging operation or discharging operation of the power storage system 100 in synchronization with the 15-minute pulse signal output from the power meter (400). As such, the 15 minute pulse signal of the electricity meter 400 is utilized as very important reference data.

This is according to the government policy, the rewards obtained when installing the power storage system is also based on the time (electric power time) of the electricity meter (400). For example, among the government policies in 2016, if ESS is installed in public institutions and ESS is charged in the light load period (23 o'clock to 09 o'clock), there is a system that reduces 50% of the electricity usage fee by 2019. In order to optimally and efficiently receive such compensation, new time data synchronized with the 15-minute synchronization time of the electricity meter 400 must be generated, and the charge / discharge of the ESS must be controlled.

In addition, even in the process of receiving a discount benefits according to the reduction in the basic fee of the power consumer, the usage fee will be optimized only when the time of the electricity meter 400 is synchronized. As such, the 15-minute synchronization signal of the electricity meter 400 is used as very important reference data in the present invention.

As described above, even in the discharge control process, the maximum power management apparatus 300 receives status information of the battery 120 through transmission and reception of battery status information through a communication interface between the controller 125 of the battery 120 and the maximum power management apparatus 300. Surveillance and management of the

Similarly, the state information according to the power conversion and the discharge control is monitored and managed through the transmission and reception of the discharge control information between the control unit 115 of the power conversion device 110 and the communication interface 340 of the maximum power management device 300.

The maximum power management device 300 remotely provides the remote monitoring unit 500 with information on the discharge control operation and the battery state of the power storage system 100, so that the remote monitor (manager) can save the power storage system 100. To monitor the discharge operation.

Reference numeral 150 in FIG. 1 denotes a low voltage relay, and 160 denotes a reverse phase relay. The low voltage relay and the reverse phase relay are alarm systems for detecting an abnormality of the system power supplied from KEPCO and preventing damage to the ESS 100 due to an abnormal current. Accordingly, the low voltage relay 150 and the reverse phase relay 160 are responsible for detecting abnormality of the KEPCO power supply and informing the maximum power management device 300 for optimal control of the ESS 100.

If the battery does not operate normally in step 816, or if the battery is already charged and does not need to be charged, or the normal state of the reverse phase relay 160 or the low voltage relay 150 in steps 820 and 824. If not, the maximum power management apparatus 300 controls the circuit breaker 140 for the charge control of the ESS 100 and the circuit breaker 130 for the discharge control (840). That is, in the charged state, the breaker 140 is operated so that no more KEPCO power is supplied to the battery 120, and in the discharged state, the breaker 130 is operated so that the storage power of the battery 120 is no longer discharged. do. The maximum power management apparatus 300 stores in the internal memory what data the error state is currently generated in, and transmits it to the remote monitoring unit 500 to provide notification information to the manager (842).

Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

100: power storage system 110: PCS
115: PMS 120: battery
125: BMS 130: breaker for discharge
140: breaker for charging 150: low voltage relay
160: reverse phase relay 200: time server
300: maximum power management device 310: synchronization time generating unit
320: input / output unit 330: signal output unit
340: communication unit 400: power meter
500: remote monitoring unit 600: KEPCO power

Claims (5)

A power meter that repeatedly generates a time-demanded pulse at predetermined time units when supplying power required for a customer or building;
Receive the standard time data synchronized with the operation control time of KEPCO, synchronize the time information for charge and discharge control of the power storage system based on the received standard time data, and charge in synchronization with the demand time pulse generated from the electricity meter A maximum power management device for generating time control information / discharge time control information; And
And a power storage system for charging the battery provided with the KEPCO or discharging the charged power based on the charge time control information / discharge time control information generated by the maximum power management device.
The maximum power management apparatus is configured to charge time synchronized with a demand time pulse generated in the electricity meter when time information for charge control of the power storage system synchronized with the standard time is included in a light load time zone of KEPCO. Control the charging of the power storage system during the control information period,
The maximum power management device, the discharge time in synchronization with the demand time pulse generated in the electricity meter when the time information for the discharge control of the power storage system synchronized with the standard time is included in the maximum load time zone of the KEPCO A maximum power management system for controlling the discharge of the power storage system during the control information period.
The method according to claim 1,
The standard time data received by the maximum power management device is received from a time server synchronized with the time information of KEPCO,
Synchronizing the time information for the charge and discharge control of the power storage system in the maximum power management device, the maximum power management system is selectively made of a seasonal unit, monthly unit, daily unit, user setting unit.
The method according to claim 2,
The maximum power management device,
A low voltage relay that monitors power supply abnormalities,
It is connected between the KEPCO supply power and the power storage system, and is connected to the reverse phase relay to monitor the occurrence of reverse transmission state,
And a maximum power management system that blocks charge and discharge control of the power storage system when an abnormal state is detected from the low voltage relay and the reverse phase relay.
The method according to claim 3,
And a monitoring unit remotely connected to the maximum power management device and configured to monitor a control signal input and a charge / discharge operation state for charge / discharge control of the power storage system.
The method according to claim 4,
The maximum power management device is installed in the internal memory, the location of the power storage system, the capacity of the power storage system, operating conditions of the power storage system (for peak reduction, heavy load or discharge of the maximum load time zone, emergency power expansion for And peak-reduction and medium-load or maximum-load time-discharge mixed information can be updated and stored, and the charge / discharge control of the power storage system is performed based on the stored value.

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