KR20140058770A - Method and system for operation mode decision of power management system - Google Patents

Method and system for operation mode decision of power management system Download PDF

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Publication number
KR20140058770A
KR20140058770A KR1020120124710A KR20120124710A KR20140058770A KR 20140058770 A KR20140058770 A KR 20140058770A KR 1020120124710 A KR1020120124710 A KR 1020120124710A KR 20120124710 A KR20120124710 A KR 20120124710A KR 20140058770 A KR20140058770 A KR 20140058770A
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South Korea
Prior art keywords
power
mode
power generation
battery
load
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KR1020120124710A
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Korean (ko)
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이수원
이태식
오성민
서정화
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이엔테크놀로지 주식회사
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Priority to KR1020120124710A priority Critical patent/KR20140058770A/en
Publication of KR20140058770A publication Critical patent/KR20140058770A/en

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The present invention relates to a method and a system to decide an operation mode for a power management system. The method for the power management system to decide an operation mode is as follows: (a) whether a power generation system generates power is determined; (b) when the power generation system is determined to generate power according to the results of step (a), a battery charged amount is greater than or equal to a first threshold value is determined; (c) when the battery charged amount is greater than or equal to the first threshold value according to the results of step (b), an operation mode is determined to be a tenth operation mode, whereby the electric power of the power generation system is supplied to a load and a system.

Description

TECHNICAL FIELD [0001] The present invention relates to a power management system,
The present invention relates to a method and system for determining an operation mode of a power management system, and more particularly, to a method and system for determining an operation mode of a power management system that determines an operation mode of a power management system, And a system.
Environmental degradation, resource depletion, etc., there is a growing interest in a system capable of storing electric power and efficiently utilizing stored electric power. In addition, the importance of renewable energy such as solar power generation is increasing. In particular, new and renewable energy uses natural resources that are infinitely supplied, such as solar power, wind power, and tidal power, and does not cause pollution in the development process.
In recent years, a smart grid system has emerged as a system that optimizes energy efficiency by bi-directionally exchanging information between power suppliers and consumers by applying information technology to existing power systems.
However, in the related art, there has been no technology for determining the operation mode of the power management system that can save electric bill by using power generation of the power generation system.
Korean Patent No. 1113508, entitled " PV PCS Integrated Bidirectional Battery Charging / Discharging System and Method "
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an electric power generating system, an electric power generating system, And a method and system for determining an operation mode of a power management system.
According to an aspect of the invention, there is provided a method for a power management system to determine an operating mode of a power management system, the method comprising: (a) determining whether the power generation system produces power; (b) (C) if the battery charge amount is equal to or greater than the first threshold value as a result of the determination in step (b), determining whether the power generation system power is higher than the first threshold, And a tenth operating mode for supplying power to the load and the system.
The method of determining an operation mode of the power management system may include determining whether a battery charge amount is equal to or greater than a first threshold value when the power generation system does not generate power as a result of the determination in step (a) The operation mode is determined to be the ninth operation mode for supplying the battery power to the load and the system and the operation mode is set to the fourth operation mode for supplying only the system power to the load when the battery charge amount is equal to or less than the second threshold value And a step of deciding whether or not to perform a search.
The method further includes determining whether the power generation system power is greater than or equal to a predetermined load average power consumption when the battery charge amount is not equal to or greater than the first threshold as a result of the determination in step (b) Determining an operation mode in a thirteenth operation mode in which the power generation system power is supplied to the load and the battery when the determination result indicates that the power consumption is equal to or greater than the load average power consumption; To the tenth operation mode in which the operation mode is selected.
In the step (a), it is determined whether or not the power generation system generates power at a predetermined time, wherein the predetermined time is a time at which the power generation system starts generating power, It may be the time to start.
According to another aspect of the present invention, there is provided an integrated management system for determining an operation mode for controlling a PCS that connects a power generation system, a battery, and a system to supply power to a load, the integrated management system comprising: A mode determination unit for determining one operation mode among a plurality of predetermined operation modes based on the power generation system power measured by the power detection unit or the battery charge amount, There is provided an integrated management system for determining an operation mode of a power management system including a PCS controller for generating a control signal for operating in an operation mode and transmitting the control signal to the PCS.
When the power generation system power is present (or the power generation system generates power), the mode determination unit determines whether the battery charge amount is equal to or greater than the first threshold value. If the battery charge amount is equal to or greater than the first threshold value, The operation mode can be determined in a tenth operation mode for supplying power to the load and the system.
The mode determination unit may determine whether the power generation system power is equal to or greater than a predetermined load average power consumption when the battery charge amount is not equal to or greater than the first threshold value, To the load and the battery, and determines the operation mode in a tenth operation mode in which the power generation system power is supplied to the load and the system when the average power consumption is not higher than the load average power consumption .
In addition, when the power generation system power is not present (or the power generation system does not generate power), the mode determination unit may determine whether the battery charge amount is equal to or greater than a first threshold value. If the battery charge amount is equal to or greater than the first threshold value, To the load and the system, and determines the operation mode to be the fourth operation mode in which only the system power is supplied to the load when the battery charge amount is equal to or less than the second threshold value.
According to the present invention, since the operation mode of the power management system is determined by using power generation of the power generation system, the user can save the electricity bill.
1 illustrates a power management system in accordance with the present invention.
2 is a block diagram schematically illustrating the configuration of an integrated management system for determining an operation mode according to the present invention;
3 illustrates a method for determining an operational mode of an integrated management system in accordance with the present invention.
The foregoing and other objects, features, and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.
The Smart Grid is a next-generation intelligent power grid that integrates information technology (IT) with existing power grids and optimizes energy efficiency by exchanging information in real time between power suppliers and consumers.
1 is a diagram illustrating a power management system in accordance with the present invention.
Referring to FIG. 1, a power management system includes a PCS 100 that supplies power to a load 500 in conjunction with a power generation system 200, a battery / BMS 300, and a system 400, And an integrated management system 600 for controlling the system.
The power generation system 200 is a system for generating power using an energy source, and supplies the generated power to the PCS 100. The power generation system 200 may include a solar power generation system, a wind power generation system, a tidal power generation system, and the like. In addition, the power generation system 200 may include a power generation system that generates power using renewable energy using solar heat or geothermal power. Particularly, a solar cell that produces electric energy using solar light is easy to install in each home or factory, and is suitable for application to the PCS 100 dispersed in each home. The power generation system 200 includes a plurality of power generation modules in parallel to generate power for each power generation module, thereby constituting a large-capacity energy system.
The system 400 includes a power plant, a substation, a transmission line, and the like. The system 400 supplies power to the PCS 100 or the load 500 and receives power supplied from the PCS 100 when the system 400 is in a normal state. When the system 400 is in an abnormal state, the power supply from the system 400 to the PCS 100 or the load 500 is stopped and the power supply from the PCS 100 to the system 400 is also stopped.
The load 500 consumes power generated from the power generation system 200, power stored in the battery 300, or power supplied from the system 400, and may be, for example, a home, a factory, or the like.
The PCS 100 can store the power generated by the power generation system 200 in the battery 300 and send the generated power to the system 400. [ The PCS 100 may transmit the power stored in the battery 300 to the system 400 or may store the power supplied from the system 400 in the battery 300. [
In addition, the PCS 100 can supply power to the load 4 by performing an uninterruptible power supply (UPS) operation when an abnormal situation occurs, for example, when a system power failure occurs in the system 400. When the system 400 is in a normal state The electric power generated by the power generation system 200 or the electric power stored in the battery 300 can be supplied to the load 500 as well.
The PCS 100 that performs the above functions includes a power conversion unit 110, a DC link unit 120, a bidirectional inverter INV 130, a bidirectional converter (BDC) 140, a first switch 150, , And a second switch (160).
The power conversion unit 110 is connected between the power generation system 200 and the first node N1. The power conversion unit 110 transfers the power generated by the power generation system 200 to the first node N1, and converts the output voltage to a DC link voltage at this time. That is, the power generated by the power generation system 200 can be supplied to the battery 300, the system 400, the load 500, and the like due to the operation of the power conversion unit 110.
The power conversion unit 110 may be constituted by a converter or a rectifying circuit depending on the type of the power generation system 200. That is, when the power generation system 200 generates DC power, the power conversion unit 110 may be a converter for converting DC power into DC power.
Conversely, when the power generation system 200 generates AC power, the power conversion unit 110 may be a rectification circuit for converting AC power into DC power. In particular, when the power generation system 200 is a photovoltaic power generation system, the power conversion unit 110 performs a maximum power point tracking (maximum power point tracking) so as to maximize the power generated by the power generation system 200, Power Point Tracking, hereinafter referred to as MPPT) control.
The power conversion unit 110 may stop operation when there is no power generated by the power generation system 200, thereby minimizing power consumed in the converter or the like.
The DC link unit 120 is connected between the first node N1 and the bidirectional inverter 130 to keep the DC link voltage of the first node N1 constant. The voltage level of the first node N1 may become unstable due to an instantaneous voltage drop of the power generation system 200 or the system 400, a peak load generation at the load 500, and the like. However, the voltage at the first node N1 needs to be stabilized for normal operation of the bidirectional converter 140 and the bidirectional inverter 130. [
The DC link unit 120 may be provided for stabilizing the level of the DC link voltage of the first node N1, and may be implemented by, for example, a capacitor. The capacitor may be an aluminum electrolytic capacitor, a high-voltage film capacitor, or a multi-layer ceramic capacitor (MLCC) for high-voltage and high-current applications. The DC link unit 120 may be implemented in the bidirectional converter 140, the bidirectional inverter 130, or the power conversion unit 110. In this case, Examples are also possible.
The bidirectional inverter 130 is a power converter connected between the DC link unit 120 and the first switch 150. The bidirectional inverter 130 converts the DC link voltage output from the power generation system 200 or the battery 300 into the AC voltage of the system 400 in the discharge mode and outputs the AC voltage.
On the other hand, the bidirectional inverter 130 rectifies the AC voltage of the system 400 to convert the AC voltage of the system 400 into a DC link voltage and stores it in order to store the power of the system 400 in the battery 300 in the charging mode. The bidirectional inverter 130 may include a filter for removing harmonics from the AC voltage output to the system 400. The bidirectional inverter 130 may include a phase of the AC voltage output from the bidirectional inverter 130 and a system And a phase locked loop (PLL) circuit for synchronizing the phases of the AC voltages of the first and second transistors 400 and 400.
In addition, the bidirectional inverter 130 may perform functions such as limiting the voltage fluctuation range, improving the power factor, removing direct current components, and protecting transient phenomena.
Way inverter 130 does not need to supply the power generated by the power generation system 200 or the power stored in the battery 300 to the load 500 or the system 400 or when the battery 300 is charged, Directional inverter 130 may be stopped to minimize the power consumption when the power of the controller 400 is not needed.
The bidirectional converter 140 DC-DC converts the power stored in the battery 300 in the discharge mode to a voltage level required by the bidirectional inverter 130, that is, a DC link voltage. On the other hand, the bidirectional converter 140 performs DC-DC conversion of the charging power flowing through the first node N1 in the charging mode to the voltage level required by the battery 300, that is, the charging voltage. Here, the charging power is, for example, the power generated from the power generation system 200 or the power supplied from the system 400 through the bidirectional inverter 130. The bidirectional converter 140 may stop operation when battery 300 is not required to be charged or discharged to minimize power consumption.
The first switch 150 and the second switch 160 are connected in series between the bidirectional inverter 130 and the second node N2 and perform an on / off operation under the control of the integrated control system 600 And controls the flow of current between the power generation system 200 and the system 400. The first switch 150 and the second switch 160 can be turned on / off according to the states of the power generation system 200, the system 400, and the battery 300. For example, when the amount of power required in the load 500 is large, both the first switch 150 and the second switch 160 are turned on and the power of the power generation system 200 and the system 400 is all used . Of course, if the power from the power generation system 200 and the system 400 can not satisfy the amount of power required by the load 500, the power stored in the battery 300 may be supplied.
On the other hand, when a power failure occurs in the system 400, the second switch 160 is turned off and the first switch 150 is turned on. The power supplied from the power generation system 200 or the battery 300 can be supplied to the load 500 and the power supplied to the load 500 flows to the system 400 to work on the power line or the like of the system 400 It is possible to prevent accidents such as electric shock.
In order to operate in the operation mode determined by the integrated control system 600, the PCS 100 configured as described above controls the power conversion unit 110, the bidirectional inverter 120, the bidirectional converter 600, (130), the first switch (150), and the second switch (160).
The battery 300 receives and stores electric power generated by the power generation system 200 or the power of the system 400 and supplies power stored in the load 500 or the system 400. The battery 300 may include at least one battery cell, and each battery cell may include a plurality of bare cells. The battery 300 may be implemented in various types of battery cells and may be a nickel-cadmium battery, a lead-acid battery, a nickel metal hydride battery (NiMH), a lithium- a lithium ion battery, a lithium polymer battery, and the like. The battery 300 can determine the number of batteries 300 according to the power capacity, design conditions, and the like required by the PCS 100. For example, when the power consumption of the load 500 is large, a plurality of batteries 300 may be provided. In the case where the power consumption of the load 500 is small, only one battery 300 may be provided .
If there is surplus power in the power generated by the power generation system 200 or power can be supplied from the system 400, it is determined whether or not the battery 300 is charged according to a state of charge (SCO) of the battery 300 . At this time, the criterion for charging the battery 300 according to the setting of the PCS 100 may be different. For example, in the case of focusing on the UPS function, it is important that as much power as possible is stored in the battery 300, so that the battery 300 can be controlled to always be charged when the battery 300 is not fully charged. Or the life of the battery 300 is shortened by reducing the number of times the battery 300 is charged, the battery 300 can be controlled not to perform the charging operation as much as possible before the battery 300 is fully discharged.
The BMS is connected to the battery 300 and controls the charging and discharging operations of the battery 300 under the control of the integrated control system 600. In order to protect the battery 300, the BMS can perform overcharge protection, over-discharge protection, over-current protection, over-voltage protection, over-temperature protection, and cell balancing. For this purpose, the BMS may monitor the voltage, current, temperature, remaining power, life span, charge state, etc. of the battery 300 and transmit related information to the integrated control system 600. In the present embodiment, the BMS is configured as a battery pack integrated with the battery 300, but the BMS and the battery 300 may be separated from each other.
The integrated management system (EMS) 600 monitors the state of the power generation system 200, the system 400, the battery 300, and the load 500 and monitors the state of the power conversion unit 110, the bidirectional inverter 130, the bidirectional converter 140, the first switch 150, and the second switch 160. [ The items monitored by the integrated management system 600 include whether the system 400 is associated with the load 500, whether power is generated in the power generation system 200, and the like.
That is, the integrated management system 600 monitors the PCS 100 at a predetermined time to measure the power generation system power and the battery charge amount, and determines the power generation amount After determining one operation mode, a control signal for operating in the determined operation mode is generated and transmitted to the PCS 100. Here, the control signal is a signal for controlling the operation of the power conversion unit 110, the bidirectional inverter 130, the bidirectional converter 140, the first switch 150, and the second switch 160 of the PCS 100, The power converter 110, the bidirectional inverter 130, the bidirectional converter 140, the first switch 150, and the second switch 160 respectively perform operations corresponding to control signals. The operation mode includes the first to thirteenth modes, wherein the first operation mode is a UPS mode, the battery power supply only to the load 500, and the second operation mode is a UPS mode, And a third mode of operation is a mode of supplying power generation system power to the load 500 and the battery 300 as a UPS mode.
The fourth operation mode is a non-operation mode (NOP) mode in which only the grid power is supplied to the load 500. The fifth operation mode is a mode in which power generation system power and system power are supplied to the load 500, The sixth operation mode is a mode for supplying the power system power, the battery power, and the grid power to the load 500. The seventh operation mode is for supplying the power generation system power and the battery power to the load 500, A ninth operating mode is a mode for supplying battery power to the load 500 and the system 400, a tenth operating mode is a mode for supplying the power generation system power to the load 500, And the system 400. The eleventh operation mode is a mode for supplying the power generation system power and the battery power to the load 500 and the system 400. The twelfth operation mode is a mode for supplying the power to the load 500 and the system 400, A mode for supplying the load to the load, It refers to a mode for supplying electric power to the power system battery 300 and the load 500.
In addition, the integrated management system 600 determines the operation mode in a tenth operation mode in which the power generation system power is present (or produced) and the power generation system power is supplied to the load and the system when the battery charge amount is equal to or greater than the first threshold, And transmits a tenth operation mode control signal for operating in the tenth operation mode to the PCS 100. [ Here, the first threshold value of the battery charge amount may be 80%.
In addition, the integrated management system 600 may be configured such that when power generation system power is present (or produced), the battery charge amount is not greater than or equal to the first threshold, and the power generation system power is greater than or equal to a predetermined load average power consumption, And transmits a thirteenth operation mode control signal for operating in the thirteenth operation mode to the PCS 100. The operation mode control signal is transmitted to the PCS 100,
In addition, the integrated management system 600 may be configured such that if the power generation system power is present (or produced), the battery charge amount is not greater than the first threshold, and the power generation system power is not greater than the load average power consumption, And transmits a thirteenth operation mode control signal for operating in the tenth operation mode to the PCS 100. The operation mode control signal is supplied to the PCS 100, Here, the load average power consumption is the average power consumed in the load, for example, 1.6K.
In addition, the integrated management system 600 may determine an operation mode in a ninth operation mode for supplying battery power to the load and the system when the power generation system power is not present (or produced) and the battery charge amount is equal to or greater than the first threshold, And transmits the ninth operation mode control signal for operating in the ninth operation mode to the PCS 100. [
Further, the integrated management system 600 determines the operation mode to the fourth operation mode in which only the grid power is supplied to the load when the power generation system power does not exist (or produce) and the battery charge amount becomes the second threshold value or less, And transmits a fourth operation mode control signal for operating in the fourth operation mode to the PCS 100. [ Here, the second threshold value of the battery charge amount may be 20%.
2 is a block diagram schematically showing the configuration of an integrated management system for determining an operation mode according to the present invention.
Referring to FIG. 2, the integrated management system 600 includes a power detector 610, a mode determiner 620, and a PCS controller 630.
The power detection unit 610 monitors the PCS at a predetermined time to measure the power generation system power and the battery charge amount. Here, the predetermined fixed time may be 8:00 am, when the power generation system starts producing power, and 5:00 pm, when the power generation system starts to stop generating power.
The mode determination unit 620 determines one operation mode among a plurality of predetermined operation modes based on the power generation system power measured by the power detection unit 610 or the battery charge amount. For example, when the mode determining unit 620 generates power in the power generation system at 8:00 am and the battery charge amount is equal to or greater than a predetermined first threshold value, . Here, the first threshold may be 80%.
In addition, the mode determination unit 620 generates power in the power generation system at 8:00 am, and if the battery charge amount is not equal to or greater than the first threshold value, it is determined whether or not the power generation system power is equal to or greater than a predetermined load average power consumption. The mode determination unit 620 determines the operation mode in a thirteenth operation mode in which the power generation system power is supplied to the load and the battery when the power generation system power is equal to or greater than the load average power consumption. And determines the operation mode in a tenth operation mode for supplying power to the load and the system. Here, the average load power consumption may be 1.6 KW.
In addition, when the power generation system power is not present (or produced), the mode determination unit 620 determines whether the battery charge amount is equal to or greater than the first threshold value. The mode determination unit 620 determines the operation mode in a ninth operation mode for supplying the battery power to the load and the system when the battery charge amount is equal to or greater than the first threshold value. When the battery charge amount is equal to or less than the second threshold value, And determines the operation mode in the fourth operation mode for supplying the load. Here, the second threshold may be 20%.
The PCS control unit 630 generates a control signal for operating in the operation mode determined by the mode determination unit 620, and transmits the control signal to the PCS.
For example, when the operation mode is determined in the tenth operation mode, the PCS control unit 630 includes a power conversion unit operation signal, a bidirectional converter operation stop signal, a bidirectional inverter discharge mode operation signal, and first and second switch- And transmits the tenth operation mode control signal to the PCS. Then, the PCS controls operations of the power conversion unit, the bidirectional converter, the bidirectional inverter, and the first and second switches in accordance with the tenth operation mode control signal. That is, the power conversion unit performs a power conversion operation, the bidirectional converter stops operation, and the bidirectional inverter operates in a discharge mode. In addition, the first and second switches are turned on to operate in a tenth operation mode for supplying power generation system power to the load and the system.
The integrated management system 600 configured as described above determines the operation mode of the power management system by using power generation of the power generation system, so that the user can save the electricity bill.
3 is a diagram illustrating a method for determining an operation mode of the integrated management system according to the present invention.
Referring to FIG. 3, when the integrated management system reaches 8:00 am (S302), it is determined whether power is generated in the power generation system (S304). Here, 8 o'clock means the time for the power generation system to start producing electric power, which is 8 o'clock here, but the time can be changed. The integrated management system monitors the PCS at 8 am to measure power generation system power, battery power, and grid power, and determines whether power generation system power exists.
If it is determined in step S304 that the power generation system generates electric power, the integrated management system determines whether the battery charge amount SOC is 80% or more (S306). Here, 80% is a threshold value before full charge, and its value can be changed.
If it is determined in step S306 that the battery charge amount is 80% or more, the integrated management system determines the operation mode in the tenth operation mode and controls the PCS to operate in the tenth operation mode (S308). The tenth operation mode is a mode for supplying power generation system power to the load and the system. The integrated management system includes a power conversion unit operation signal, a bidirectional converter operation stop signal, a bidirectional inverter discharge mode operation signal, first and second switch- And transmits the tenth operation mode control signal to the PCS. Then, the PCS controls operations of the power conversion unit, the bidirectional converter, the bidirectional inverter, and the first and second switches in accordance with the tenth operation mode control signal. That is, the power conversion unit performs a power conversion operation, the bidirectional converter stops operation, and the bidirectional inverter operates in a discharge mode. In addition, the first and second switches are turned on to operate in a tenth operation mode for supplying power generation system power to the load and the system.
At 5:00 PM during step S308, the integrated management system determines whether the battery charge amount is 80% or more (S312). Here, 5:00 PM means the time for the power generation system to stop generating electric power. In this case, the time is 5:00, but the time can be changed. For example, solar cells do not generate solar heat at 5 pm, so they can be at 5 pm to stop power production.
If it is determined in step S312 that the battery charge amount is 80% or more, the integrated management system determines the operation mode in the ninth operation mode and controls the PCS to operate in the ninth operation mode (S314). The ninth operation mode is a mode for supplying the battery power to the load and the system. The integrated management system includes a ninth operation including a power conversion unit operation stop signal, a bidirectional converter and a bidirectional inverter discharge signal, Mode control signal to the PCS. Then, in accordance with the ninth operation mode control signal, the PCS controls the operations of the power conversion unit, the bidirectional converter, the bidirectional inverter, and the first and second switches. That is, the power conversion section stops operation, and the bidirectional converter and bidirectional inverter operate in the discharge mode. Further, the first switch and the second switch are turned on to operate in a ninth operation mode for supplying the battery power to the load and the system.
In step S314, the integrated management system determines whether the battery charge amount is less than 20% (S316). Here, 20% is a threshold value indicating a full discharge, and its value can be changed.
If it is determined in step S316 that the battery charge amount is less than 20%, the integrated management system determines the operation mode in the fourth operation mode and controls the PCS to operate in the fourth operation mode (S318). The fourth operation mode is a mode for supplying the system power to the load. The integrated management system includes a power conversion unit operation stop signal, a bidirectional inverter and a bidirectional converter operation stop signal, a first switch off signal, 4 Transmit the operation mode control signal to the PCS. Then, according to the fourth operation mode control signal, the PCS controls the operation of the power conversion section, the bidirectional converter, the bidirectional inverter, and the first and second switches. That is, the power converter, the bidirectional inverter and the bidirectional converter stop operating, the first switch is off, and the second switch is off, so that only the system power is supplied to the load.
If it is determined in step S306 that the battery charge amount is not 80% or more, the integrated management system determines whether the power generation system power is 1.6 Kw or more (S320). Here, 1.6 Kw is a value (load average power consumption) meaning an average power consumed in the load, and its value can be changed.
If it is determined in step S320 that the power generation system power is 1.6 Kw or more, the integrated management system determines the operation mode in the 13th operation mode and controls the PCS to operate in the 13th operation mode (S322). The thirteenth operation mode is a mode for supplying the power generation system power to the load and the battery. That is, if the power generation system power is 1.6 Kw or more, the integrated management system determines the operation mode in the thirteenth operation mode in which the load is judged to remain even after using the electric power and the battery can be charged. The integrated management system transmits to the PCS a thirteenth operating mode control signal including a power conversion unit operation signal, a bidirectional converter charging mode signal, a bidirectional inverter discharge operation signal, a first switch on signal, and a second switch off signal. Then, according to the thirteenth operation mode control signal, the PCS controls the operations of the power conversion unit, the bidirectional converter, the bidirectional inverter, and the first and second switches. That is, the power conversion unit performs the power conversion operation, the bidirectional converter operates in the charge mode, and the bidirectional inverter operates in the discharge mode. In addition, the first switch is turned on and the second switch is turned off to operate in a thirteenth operation mode for supplying power generation system power to the battery and the load.
After performing step S322, the integrated management system performs step S310.
If it is determined in step S320 that the power generation system power is not 1.6 Kw or more, the integrated management system determines the operation mode in the tenth operation mode and controls the PCS to operate in the tenth operation mode (S324). The tenth operation mode is a mode for supplying power generation system power to the load and the system. The integrated management system includes a power conversion unit operation signal, a bidirectional converter operation stop signal, a bidirectional inverter discharge mode operation signal, first and second switch- And transmits the tenth operation mode control signal to the PCS. Then, the PCS controls operations of the power conversion unit, the bidirectional converter, the bidirectional inverter, and the first and second switches in accordance with the tenth operation mode control signal. That is, the power conversion unit performs a power conversion operation, the bidirectional converter stops operation, and the bidirectional inverter operates in a discharge mode. In addition, the first and second switches are turned on to operate in a tenth operation mode for supplying power generation system power to the load and the system.
After performing step S324, the integrated management system performs step S310.
If it is determined in step S304 that power is not generated in the power generation system, the integrated management system performs step S310. Even if it is 8 o'clock in the morning, if the power generation system does not produce power due to the weather or the like, it means the same as 5 pm that does not produce power, so Step S310 is performed.
Thus, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.
100: PCS 200: Power generation system
300: Battery / BMS 400: System
500: Load 600: Integrated management system

Claims (8)

  1. A method for an integrated management system to determine an operating mode of a power management system,
    (a) determining whether the power generation system generates power at a predetermined time;
    (b) determining whether the battery charge amount is equal to or greater than a first threshold value when the power generation system generates power as a result of the determination in step (a); And
    (c) determining an operation mode in a tenth operation mode in which power generation system power is supplied to the load and the system when the battery charge amount is equal to or greater than the first threshold as a result of the determination in step (b);
    Wherein the power management system determines the operating mode of the power management system.
  2. The method according to claim 1,
    Determining whether the battery charging amount is equal to or greater than a first threshold value when the power generation system does not generate power as a result of the determination in step (a); if the battery charging amount is equal to or greater than the first threshold value, And determining the operation mode in a fourth operation mode for supplying only the system power to the load when the battery charge amount is equal to or less than the second threshold value Of the power management system.
  3. The method according to claim 1,
    Determining whether the power generation system power is equal to or greater than a predetermined load average power consumption when the battery charge amount is not equal to or greater than the first threshold value as a result of the determination in step (b);
    Determining an operation mode in a thirteenth operation mode in which the power generation system power is supplied to the load and the battery when the determination result indicates that the power consumption is equal to or greater than the load average power consumption; And determining an operation mode in a tenth operation mode for supplying the operation mode to the power management system.
  4. The method according to claim 1,
    Wherein the predetermined period of time is a time at which the power generation system starts producing power or a time at which the power generation system starts to stop generating power.
  5. 1. An integrated management system for determining an operation mode for controlling a power condition system (PCS) that supplies electric power to a load in connection with a power generation system, a battery, and a system,
    A power detector for monitoring the power generation system power and the battery charge amount by monitoring the PCS at a predetermined time;
    A mode determination unit for determining one operation mode among a plurality of predetermined operation modes based on the measured power generation system power or the charged battery amount; And
    A PCS control unit for generating a control signal for operating in the operation mode determined by the mode determination unit and transmitting the generated control signal to the PCS;
    And an integrated management system for determining an operating mode of the power management system.
  6. 6. The method of claim 5,
    Wherein the mode determination unit determines whether the battery charge amount is equal to or greater than a first threshold value when the power generation system power is present or when the power generation system generates power and if the battery charge amount is equal to or greater than the first threshold value, And the operation mode is determined to be the tenth operation mode for supplying the load and the system to the integrated management system for determining the operation mode of the power management system.
  7. The method according to claim 6,
    Wherein the mode determination unit determines whether or not the power generation system power is equal to or greater than a predetermined load average power consumption when the battery charge amount is not equal to or greater than the first threshold value, And a thirteenth operation mode for supplying power to the battery, and determines the operation mode in a tenth operation mode for supplying the power generation system power to the load and the system when the operation mode is not equal to or more than the load average power consumption. An integrated management system for determining the operating mode of a power management system.
  8. 6. The method of claim 5,
    Wherein the mode determination unit determines whether the battery charge amount is equal to or greater than a first threshold value when the power generation system power is present (or the power generation system does not generate power), and if the battery charge amount is equal to or greater than the first threshold value, And a fourth operation mode in which only the system power is supplied to the load when the battery charge amount is equal to or less than the second threshold value, Integrated management system for determining the operation mode of management system.
KR1020120124710A 2012-11-06 2012-11-06 Method and system for operation mode decision of power management system KR20140058770A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018159910A1 (en) * 2017-02-28 2018-09-07 엘에스산전 주식회사 Uninterruptible power supply system comprising energy storage system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018159910A1 (en) * 2017-02-28 2018-09-07 엘에스산전 주식회사 Uninterruptible power supply system comprising energy storage system

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