KR20200025731A - Energy management system and control method for power control using Voltage Regulation - Google Patents

Energy management system and control method for power control using Voltage Regulation Download PDF

Info

Publication number
KR20200025731A
KR20200025731A KR1020180103551A KR20180103551A KR20200025731A KR 20200025731 A KR20200025731 A KR 20200025731A KR 1020180103551 A KR1020180103551 A KR 1020180103551A KR 20180103551 A KR20180103551 A KR 20180103551A KR 20200025731 A KR20200025731 A KR 20200025731A
Authority
KR
South Korea
Prior art keywords
voltage
power
battery
energy management
control
Prior art date
Application number
KR1020180103551A
Other languages
Korean (ko)
Inventor
오승열
박병철
송성근
정규창
차대석
최정식
Original Assignee
전자부품연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 전자부품연구원 filed Critical 전자부품연구원
Priority to KR1020180103551A priority Critical patent/KR20200025731A/en
Publication of KR20200025731A publication Critical patent/KR20200025731A/en

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63JAUXILIARIES ON VESSELS
    • B63J3/00Driving of auxiliaries
    • B63J3/04Driving of auxiliaries from power plant other than propulsion power plant
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63JAUXILIARIES ON VESSELS
    • B63J3/00Driving of auxiliaries
    • B63J2003/001Driving of auxiliaries characterised by type of power supply, or power transmission, e.g. by using electric power or steam
    • B63J2003/002Driving of auxiliaries characterised by type of power supply, or power transmission, e.g. by using electric power or steam by using electric power

Abstract

The present invention discloses an energy management system and control method for power control using voltage fluctuations. The energy management system of the present invention is a power management system for detecting a power state of a ship in DC distribution, receives a power state detected from the power management system, and if the normal situation based on the received power state for the DC grid connection When the battery power storage system and the battery power storage system perform the grid connection mode and perform the grid connection mode in case of an emergency, the battery power storage system and the battery power storage system perform the voltage command mode for generating the DC grid voltage. And a voltage change controller for generating a command current for controlling charging and discharging of the battery power storage system to maintain the 650V.

Description

Energy management system and control method for power control using voltage variation {Energy management system and control method for power control using Voltage Regulation}

The present invention relates to an energy management system, and more particularly to an energy management system and control for power control using a voltage change to control the power using a voltage change in order to respond to the peak load of the DC microgrid system in the ship It is about a method.

The power inside the ship is generated into AC power by the diesel generator, and the grid voltage is generated to 750V through the active front end (AFE). The generated grid voltage is connected to the ship's internal load, motor, energy storage system (ESS), etc. to supply power. These system voltages can be controlled at variable speeds because the AFE can output a constant voltage even when the frequency changes.

On the other hand, the power in the ship is divided into a constant load and instantaneous load, the general vessel has a problem in that the initial equipment investment due to the unnecessary power is designed by the instantaneous load capacity for the overall power operation. In addition, there is a problem for emergency replacement in the event of a fuel shortage or failure of a diesel generator generating main power.

Korean Patent Publication No. 10-1290290 (2013.07.22.)

The technical problem to be achieved by the present invention is to provide an energy management system and a control method to secure the power by using the load bias of the power, and to control the power by using a voltage change that can effectively respond to emergencies such as power failure. have.

Another object of the present invention is to provide an energy management system and control method for controlling power by using voltage variation to control peak load and base load distribution in a vessel based on voltage variation.

In order to achieve the above object, the energy management system for power control using the voltage fluctuation of the present invention is a power management system for detecting the power state of the ship in the DC distribution, receiving the power state detected from the power management system and And a battery power storage system performing a grid connection mode for linking a DC grid in a normal situation based on the received power state, and performing a voltage command mode for generating a DC grid voltage in an emergency. When the system performs the grid-connected mode, and includes a voltage change controller for generating a command current for controlling the charging and discharging of the battery power storage system based on the voltage change to maintain the power of the DC system 650V.

In addition, the power management system, it characterized in that the real-time detection of the output voltage of the AFE (Active Front End) for converting the output of the diesel generator of the vessel into a DC system.

The battery power storage system also includes a battery in which electrical energy is stored; And a power converter converting power to charge or discharge the battery based on the command current.

In addition, the voltage fluctuation control unit always monitors the voltage of the DC system of 650V, and when the voltage of the DC system changes voltage to ± 30V, in order to determine any one of the accident, load fluctuation and stop state of the DC system. The voltage state is detected for a set time.

In addition, the voltage fluctuation control unit generates a command current to control battery charging when the voltage of the DC system is 680V or more so that the voltage of the DC system is operated in the range of 650V ± 30V, and controls the battery discharge when the voltage of the DC system is 620V or less. It generates a command current to control the power supply of the DC system to maintain 650V.

In addition, the voltage fluctuation control unit may gradually reduce the preset time command current to determine the power recovery of the 650V DC power, and terminate the voltage fluctuation control when the command current reaches zero.

In addition, the voltage fluctuation control unit, when the voltage of the DC system is less than 450V is a low voltage accident, if it is more than 750V is determined as an overvoltage accident, it characterized in that the control of the power supply of the DC system in the ship is stopped.

The energy management system control method of the present invention comprises the steps of the energy management system to detect the power state of the ship in the DC distribution, the grid connection for the DC grid connection when the energy management system is a normal situation based on the detected power state Performing a mode and performing a voltage command mode for generating a DC grid voltage in an emergency situation; and when the energy management system performs the grid linking mode, the power of the DC grid maintains 650 V based on voltage fluctuations. Generating a command current to control charging and discharging of the battery.

The energy management system and control method for power control using the voltage fluctuation according to the present invention can secure the reserve power by biasing the load, and can effectively respond to emergencies such as power failure.

In addition, by controlling the peak and base load distribution in the vessel based on the voltage variation of the battery power storage system, it is possible to reduce the initial equipment investment when designing the total power in the vessel.

1 is a schematic diagram illustrating a DC microgrid system of a ship according to an embodiment of the present invention.
2 is a block diagram illustrating an energy management system according to an embodiment of the present invention.
3 is a view for explaining a connection structure of a battery power storage system according to an embodiment of the present invention.
4 is a flowchart illustrating an operation of a battery power storage system according to an embodiment of the present invention.
5 is a flowchart illustrating the operation of the voltage fluctuation control unit according to the embodiment of the present invention.
FIG. 6 is a view for explaining a case of discharging through voltage fluctuation control when a DC system peak load is generated according to an exemplary embodiment of the present invention.
FIG. 7 is a diagram for describing a case in which additional peak load occurs during DC system recovery according to an embodiment of the present invention.
8 is a view for explaining a case of discharging through the voltage change control after the DC system recovery according to an embodiment of the present invention.
FIG. 9 is a diagram illustrating a case of charging through voltage fluctuation control when a DC system ground load is generated according to an embodiment of the present invention.
FIG. 10 is a diagram illustrating a case of charging through voltage fluctuation control after DC system recovery according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it is noted that the same reference numerals are assigned to the same components as much as possible, even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function is obvious to those skilled in the art or may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a schematic diagram illustrating a DC microgrid system of a ship according to an embodiment of the present invention, Figure 2 is a block diagram illustrating an energy management system according to an embodiment of the present invention, Figure 3 is a view of the present invention A diagram for describing a connection structure of a battery power storage system according to an embodiment.

1 to 3, an energy management system (EMS) 100 controls power by using voltage fluctuations to correspond to peak loads of the DC microgrid system 200 in a ship. The energy management system 100 may secure the reserve power by biasing the load and effectively cope with an emergency such as a power failure. In addition, the energy management system 100 controls the peak load and the base load distribution in the vessel based on the voltage variation, it is possible to reduce the initial equipment investment when designing the total power in the vessel. The vessel may be a vessel of the DC distribution. The energy management system 100 includes a power management system (PMS) 110, a battery energy storage system (BESS) 130, and a voltage regulation (VR) controller 150. Include.

The power management system 110 detects the power state of the ship in the DC distribution. The power management system 110 detects the output voltage of an active front end (AFE) that converts the output of the diesel generator of the ship into a DC system in real time. The power management system 110 transmits information about the output voltage sensed in real time to the battery power storage system 130. At this time, the power management system 110 performs serial communication with the battery power storage system 130, and preferably may perform serial communication using RS485.

The battery power storage system 130 receives the detected power state from the power management system 110 and performs the grid connection mode for linking the DC system in the normal case based on the received power state, and in the emergency, the voltage command. Perform the mode. The battery power storage system 130 includes a battery 131 and a power converter 133.

The battery 131 stores electrical energy. The battery 131 is a secondary battery capable of charging and discharging. The battery 131 may have a voltage of 390Vdc to 480Vdc.

The power converter 133 is connected to the battery 131 and converts power so that electric energy stored in the battery 131 is discharged to the outside or the external power is charged by the battery 131. The power converter 133 serves as a medium to help the battery 131 communicate with the outside and transmit power. That is, the power converter 133 receives the power state from the power management system 110. The power converter 133 transmits the measurement information of the DC system voltage to the voltage variation controller 150, and receives a command current from the voltage variation controller 150 to control charging and discharging of the battery 131.

Here, the battery 131 and the power converter 133 perform controller area network (CAN) communication with each other.

When the battery power storage system 130 performs the grid connection mode, the voltage variation controller 150 controls the power of the DC system to maintain 650V based on the voltage variation. To this end, the voltage variation controller 150 generates a command current for controlling charging and discharging of the battery power storage system 130.

In detail, the voltage variation controller 150 constantly monitors the voltage of the DC system of 650V. That is, the voltage variation controller 150 monitors the voltage of the DC system measured by the battery power storage system 130 in real time. The voltage fluctuation control unit 150 detects a voltage state for a predetermined time to determine any one of an accident, a load fluctuation, and a stop state of the DC system when the voltage of the DC system is changed to ± 30V. The predetermined time may be 5msec to 15msec, preferably 10msec.

The voltage fluctuation control unit 150 controls the remaining power to be charged in the battery 131 by generating a command current for controlling the battery charging when the voltage of the DC system is 680V or more so that the voltage of the DC system is operated in the range of 650V ± 30V. In addition, the voltage fluctuation control unit 150 generates a command current to control battery discharge when the voltage of the DC system is 620V or less so that the insufficient power is discharged from the battery 131. Through this, the voltage variation control unit 150 controls the power of the DC system to maintain 650V. At this time, the voltage fluctuation control unit 150 may gradually reduce the preset time command current to determine the power recovery of the 650V DC power supply. The preset time may be 30 seconds to 1 minute 30 seconds, preferably 1 minute. If the command current reaches zero, the voltage variation controller 150 ends the voltage variation control.

On the other hand, the voltage fluctuation control unit 150 determines that the voltage of the DC system is less than 450V is a low voltage accident, and if the voltage of the DC system is greater than 750V, an overvoltage accident. The voltage fluctuation control unit 150 controls to stop the power supply of the DC system in the ship when it is determined that the low voltage accident and the overvoltage accident. In addition, the voltage fluctuation control unit 150 may control in real time so that the voltage of the DC system becomes 650V through additional current supply when the voltage of the DC system is out of the 650V range during the voltage fluctuation control.

4 is a flowchart illustrating an operation of a battery power storage system according to an embodiment of the present invention.

3 and 4, the battery power storage system 130 performs a voltage command mode or a grid connection mode.

In step S111, the battery power storage system 130 determines an operation and stop state. At this time, the battery power storage system 130 may determine the operation and stop state through the command of the power state received from the power management system 110. The battery power storage system 130 performs step S113 when it is determined that the operation state, and the operation is terminated when determining that the battery power storage state.

In operation S113, the battery power storage system 130 determines an operation mode. The battery power storage system 130 determines an operation mode by determining whether an operation state is an emergency state or a normal state. The battery power storage system 130 performs step S115 in an emergency situation, and performs step S123 in a normal situation.

In step S115, the battery power storage system 130 performs a voltage command mode. The battery power storage system 130 generates a DC system voltage through the voltage command mode.

In step S117, the battery power storage system 130 determines whether an external voltage is detected. The battery power storage system 130 performs step S119 when the output voltage is not 0V, and performs step S121 when the output voltage is 0V.

In step S119, the battery power storage system 130 determines that the current state is a failure. The battery power storage system 130 determines that the failure, thereby ending the operation.

In step S121, the battery power storage system 130 outputs 650V.

Therefore, the voltage command mode measures the system voltage to detect other converter operating conditions in the DC microgrid so that it does not operate when a certain voltage is exceeded. That is, in the energy storage system 100, after the initialization and termination of the entire system should be switched to the emergency mode.

In step S123, the battery power storage system 130 performs the grid connection mode. The battery power storage system 130 connects the DC system through the grid connection mode.

In operation S125, the battery power storage system 130 performs voltage fluctuation control. The battery power storage system 130 performs voltage fluctuation control according to the command current received from the voltage fluctuation control unit 150.

5 is a flowchart illustrating the operation of the voltage fluctuation control unit according to the embodiment of the present invention.

3 and 5, the voltage fluctuation control unit 150 generates a command current for controlling charging and discharging of the battery power storage system.

In operation S131, the voltage variation controller 150 determines an output voltage state. The voltage variation controller 150 detects whether there is a voltage variation from 650V to ± 30V for 10mese, and performs step S133 if there is no voltage variation, and performs step S135 if there is a voltage variation.

In step S133, the voltage variation controller 150 determines that there is no voltage variation in the output voltage, and branches to the first start. That is, the voltage variation controller 150 determines that the output voltage is not abnormal.

In step S135, the voltage variation controller 150 performs control on the voltage variation of the output voltage.

In step S137, the voltage fluctuation control unit 150 determines whether the output voltage is an overvoltage or an undervoltage. Here, the overvoltage is 0V to + 30V higher than 650V, and the undervoltage is -30V to 0V lower than 650V. The voltage fluctuation control unit 150 performs step S139 when the overvoltage is performed and step S153 when the undervoltage is performed.

In step S139, the voltage fluctuation control unit 150 performs an overvoltage routine. The voltage variation controller 150 performs a routine for maintaining the overvoltage of the DC system to maintain a normal voltage of 650V.

In step S141, the voltage fluctuation control unit 150 performs a charging mode to make the overvoltage a normal voltage. That is, the voltage variation controller 150 may generate a command current for charging the battery 131 with more voltage than the normal voltage.

In step S143, the voltage variation controller 150 compares the output voltage with the reference voltage. The voltage variation controller 150 performs step S145 when the output voltage is greater than the reference voltage, and performs step S147 when the output voltage is less than the reference voltage.

In step S145, the voltage variation controller 150 increases -command current. The voltage variation controller 150 increases the -command current until the overvoltage becomes a normal voltage. To this end, the voltage variation controller 150 branches to step S143 until the overvoltage becomes a normal voltage.

In step S147, the voltage change controller 150 maintains the command current. The voltage variation controller 150 maintains the command current for 1 minute to determine whether the power of the DC system is restored to 650V.

In step S149, the voltage variation controller 150 determines an output voltage state. The voltage fluctuation control unit 150 performs step S151 when the output voltage is 0V to + 30V, and if there is no voltage fluctuation, terminates the voltage fluctuation control and branches to the first start.

In step S151, the voltage fluctuation control unit 150 decreases the -command current. The voltage fluctuation control unit 150 decreases the -command current until the command current becomes 0V. To this end, the voltage variation controller 150 branches to step S149 until the command current becomes 0V.

In step S153, the voltage fluctuation control unit 150 performs an undervoltage routine. The voltage variation controller 150 performs a routine for maintaining the undervoltage of the DC system to maintain a normal voltage of 650V.

In step S155, the voltage fluctuation control unit 150 performs a discharge mode to make the undervoltage normal. That is, the voltage variation controller 150 may generate a command current to compensate the undervoltage for the voltage discharged from the battery 131.

In step S157, the voltage variation controller 150 compares the output voltage with the reference voltage. The voltage variation controller 150 performs step S159 when the output voltage is less than the reference voltage, and performs step S161 when the output voltage is greater than the reference voltage.

In step S159, the voltage variation controller 150 increases the + command current. The voltage variation controller 150 increases the + command current until the undervoltage becomes a normal voltage. To this end, the voltage variation controller 150 branches to step S157 until the undervoltage becomes a normal voltage.

In step S161, the voltage change controller 150 maintains the command current. The voltage variation controller 150 maintains the command current for 1 minute to determine whether the power of the DC system is restored to 650V.

In step S163, the voltage variation controller 150 determines the output voltage state. The voltage variation controller 150 performs step S165 when the output voltage is -30V to 0V, and if there is no voltage variation, terminates the voltage variation control and branches to the first start.

In step S165, the voltage variation controller 150 decreases the + command current. The voltage variation controller 150 decreases the + command current until the command current becomes 0V. To this end, the voltage variation controller 150 branches to step S163 until the command current becomes 0V.

FIG. 6 is a diagram illustrating a case of discharging through voltage fluctuation control when a DC system peak load is generated according to an exemplary embodiment of the present invention.

2 and 6, the energy management system 100 discharges current through voltage fluctuation control when a DC system peak load occurs.

For example, if a peak load occurs while maintaining a DC grid power supply of 650 V, voltage fluctuations occur. At this time, the energy management system 100 determines the power state for 10msec and then discharges the current to the DC system power so that the DC system power is maintained if there is no system accident. After the DC system power 650V is restored, the energy management system 100 maintains the discharge current for 10 seconds, and gradually reduces the current to 0 (A) after 10 seconds to determine the recovery of the DC system power. At this time, if out of the 650V power range, the energy management system 100 discharges the current again to maintain the power of the DC system to 650V.

FIG. 7 is a diagram for describing a case in which an additional peak load occurs during DC system recovery according to an embodiment of the present invention. FIG.

Referring to FIG. 7, the energy management system 100 controls the DC system power to be maintained when an additional peak load occurs during DC system recovery.

For example, the energy management system 100 generates a command to increase the discharge current to maintain the DC system power stably in order to maintain the DC system power that is changed when an additional peak load occurs during voltage fluctuation control.

8 is a view for explaining a case of discharging through the voltage fluctuation control after the DC system recovery according to an embodiment of the present invention.

Referring to FIG. 8, the energy management system 100 discharges a current through voltage fluctuation control after DC system recovery.

For example, the energy management system 100 gradually reduces the discharge current to 0 (A) until there is no change in the DC system power in the power recovery determination state. Here, the energy management system 100 ends the voltage fluctuation control when the discharge current reaches 0 (A).

FIG. 9 is a diagram illustrating a case of charging through voltage fluctuation control when a DC system ground load is generated according to an embodiment of the present invention.

Referring to FIG. 9, the energy management system 100 charges a current through voltage fluctuation control when a DC system ground load is generated.

For example, if a base load occurs while maintaining a DC grid power supply of 650 V, a voltage change occurs. At this time, the energy management system 100 determines the power state for 10msec and then charges the current of the DC system power so that the DC system power is maintained if there is no system accident. After the DC system power 650V is restored, the energy management system 100 maintains the charging current for 10 seconds, and gradually reduces the current to 0 (A) after 10 seconds to determine the recovery of the DC system power. At this time, if out of the 650V power range, the energy management system 100 recharges the current to maintain the power of the DC system at 650V.

10 is a diagram illustrating a case of charging through voltage fluctuation control after DC system recovery according to an embodiment of the present invention.

Referring to FIG. 10, the energy management system 100 charges a current through voltage fluctuation control after DC system recovery.

For example, the energy management system 100 gradually reduces the charging current to 0 (A) until there is no change in the DC system power in the power recovery determination state. Here, the energy management system 100 terminates the voltage fluctuation control when the charging current reaches 0 (A).

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific preferred embodiments described above, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such changes are within the scope of the claims.

100: energy management system
110: power management system
130: battery power storage system
131: battery
133: power converter
150: voltage fluctuation control unit
200: DC microgrid system

Claims (8)

  1. A power management system for detecting a power state of the ship in DC distribution;
    Receives the detected power state from the power management system, and performs the grid connection mode for DC grid linkage in the normal situation based on the received power state, and the voltage command mode for generating the DC grid voltage in the emergency situation. Battery power storage system to perform; And
    A voltage variation controller configured to generate a command current for controlling charging and discharging of the battery power storage system such that the power of the DC system maintains 650V based on the voltage variation when the battery power storage system performs the grid connection mode;
    Energy management system for power control using a voltage variation comprising a.
  2. The method of claim 1,
    The power management system,
    Energy management system for power control using the voltage change, characterized in that for detecting the output voltage of the AFE (Active Front End) for converting the output of the diesel generator of the vessel into a DC system in real time.
  3. The method of claim 1,
    The battery power storage system,
    A battery in which electrical energy is stored; And
    A power converter converting electric power to charge or discharge the battery based on the command current;
    Energy management system for power control using a voltage variation comprising a.
  4. The method of claim 1,
    The voltage fluctuation control unit,
    Always monitor the voltage of the DC system of 650V and detect the voltage state for a preset time to determine any one of accident, load fluctuation and stop state of the DC system when the voltage of the DC system is changed to ± 30V. Energy management system for power control using a voltage change, characterized in that.
  5. The method of claim 1,
    The voltage fluctuation control unit,
    When the voltage of DC system is 680V or higher, the DC current generates a command current to control battery charging.If the voltage of DC system is 620V or lower, it generates a command current to control battery discharge. Energy management system for power control using voltage fluctuation, characterized in that to control the power of the system to maintain 650V.
  6. The method of claim 1,
    The voltage fluctuation control unit,
    Power management using voltage fluctuation, characterized in that the power of the DC system gradually decreases the preset time command current to determine the power recovery of 650 V, and terminates the voltage fluctuation control when the command current reaches 0. system.
  7. The method of claim 1,
    The voltage fluctuation control unit,
    When the voltage of the DC system is less than 450V, it is a low voltage accident, and if it is more than 750V, it is determined as an overvoltage accident, and energy management using power fluctuations by controlling the power supply of the DC system in the vessel is stopped. system.
  8. Detecting, by the energy management system, the power state of the ship in DC distribution;
    Performing, by the energy management system, a grid connection mode for linking a DC grid in a normal situation based on the sensed power state, and performing a voltage command mode for generating a DC grid voltage in an emergency; And
    When the energy management system performs the grid-connected mode, generating a command current for controlling charging and discharging of a battery such that the power of the DC system maintains 650V based on the voltage fluctuation;
    Energy management system control method comprising a.
KR1020180103551A 2018-08-31 2018-08-31 Energy management system and control method for power control using Voltage Regulation KR20200025731A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020180103551A KR20200025731A (en) 2018-08-31 2018-08-31 Energy management system and control method for power control using Voltage Regulation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020180103551A KR20200025731A (en) 2018-08-31 2018-08-31 Energy management system and control method for power control using Voltage Regulation

Publications (1)

Publication Number Publication Date
KR20200025731A true KR20200025731A (en) 2020-03-10

Family

ID=69801185

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020180103551A KR20200025731A (en) 2018-08-31 2018-08-31 Energy management system and control method for power control using Voltage Regulation

Country Status (1)

Country Link
KR (1) KR20200025731A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101290290B1 (en) 2011-11-24 2013-07-26 한국해양대학교 산학협력단 Energy management system and method for ship

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101290290B1 (en) 2011-11-24 2013-07-26 한국해양대학교 산학협력단 Energy management system and method for ship

Similar Documents

Publication Publication Date Title
US20180198282A1 (en) Energy storage system
JP5463333B2 (en) Wind park driving method
JP6445828B2 (en) Battery pack, energy storage system including battery pack, and battery pack charging method
US20170331286A1 (en) Power management circuit for wireless communication device and process control system using same
US9071056B2 (en) Apparatus and method for managing battery cell, and energy storage system
US8901876B2 (en) Charge/discharge determining apparatus and computer-readable medium
JP5265639B2 (en) Apartment house energy storage system, integrated power management system and control method therefor
US10566802B2 (en) Energy storage system
KR101084215B1 (en) Energy storage system and method for controlling thereof
US9787170B2 (en) Power conversion device
DK2351189T3 (en) Frequency responsive, charge-maintaining management of electricity storage systems for auxiliary services on an electrical grid.
JP5903622B2 (en) Power supply system and charge / discharge power conditioner
US8456878B2 (en) Power storage system and method of controlling the same
US6380715B1 (en) Electric power system
JP2014195401A (en) Power management system
CN101604858B (en) Battery management systems, battery pack and battery management method
ES2673094T3 (en) Procedure to operate a wind power installation
US9935465B2 (en) Power conversion device
US7439635B2 (en) Output suppressing method of a plurality of dispersed power sources and dispersed power source managing system
KR101243909B1 (en) System for energy storage and control method thereof
EP2670015B1 (en) Power control device and power control method
KR20150081731A (en) Battery pack, energy storage system including the battery pack, and method of operating the battery pack
US20120161704A1 (en) Charging station for electric vehicles with network stabilization
JP2011135763A (en) Energy storage system and method of controlling the same
KR100794197B1 (en) The method for controlling operation using hybrid distributed generation system

Legal Events

Date Code Title Description
A201 Request for examination