KR101539728B1 - energy management system for solar generation - Google Patents

energy management system for solar generation Download PDF

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KR101539728B1
KR101539728B1 KR1020150023266A KR20150023266A KR101539728B1 KR 101539728 B1 KR101539728 B1 KR 101539728B1 KR 1020150023266 A KR1020150023266 A KR 1020150023266A KR 20150023266 A KR20150023266 A KR 20150023266A KR 101539728 B1 KR101539728 B1 KR 101539728B1
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bess
pcs
electricity
charging
power
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KR1020150023266A
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Korean (ko)
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정태훈
최형석
이규영
남성필
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주식회사 티팩토리
주식회사 메타베스
정태훈
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/38—Energy storage means, e.g. batteries, structurally associated with PV modules
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The present invention relates to a system for effectively operating power generation electricity generated from a solar module in association with a power distribution system, which comprises: a solar generation module; a DC-DC converter which converts the electricity generated form the solar generation module into the power generation electricity at a preset voltage; a battery energy storage system (BESS) which charges the power generation electricity; a bidirectional power condition system (PCS) which discharges the power generation electricity or charging electricity of the BESS to a power distribution system in a preset output, or charges electricity of the power distribution system to the BESS; and an energy management controller (EMC) which is connected to the BESS and the PCS, and discharges the power generation electricity or the charging electricity of the BESS to the power distribution system through the PCS according to the charging state of the BESS, or controls the PCS to charge the electricity of the power distribution system to the BESS.

Description

태양광 에너지 관리시스템{energy management system for solar generation} [0001] The present invention relates to a solar energy management system,

본 발명은 태양광 발전모듈과 배터리에너지저장장치(BESS: Battery Energy Storage System)와 배전계통(Grid)을 효율적으로 운용하기 위한 태양광 에너지 관리시스템에 관한 것이다.The present invention relates to a solar energy management system for efficiently operating a solar power generation module, a battery energy storage system (BESS), and a distribution system (Grid).

특허등록 10-0340680(발명의 명칭: 태양광 발전콘트롤 시스템)(이하, '종래기술'이라 함)은 태양광장치에서 발전된 전기를 배터리에 충전하고, 배터리의 전기를 직류 또는 교류로 변환하여 배전계통에 공급하도록 하는 시스템으로, 배터리의 과충전 및 과방전을 방지하여 배터리의 수명을 연장시키기 위한 개술구성이 개시되어 있다.(Hereinafter referred to as a "prior art") is a system in which a battery is charged with electricity generated from a solar power device, and the electricity of the battery is converted into a direct current or an alternating current, System to prevent overcharging and overdischarge of the battery, thereby prolonging the service life of the battery.

그러나 이와 같은 종래기술은 최대충전용량에 가까운 제1충전용량(통상적으로 SOC 80%, State Of Charge 80%) 이상이면 과충전으로 인식하여 태양광장치로부터 발전된 전기가 더 이상 배터리에 충전되지 않도록 하여 전부 방전시킨다. 또한 제1충전용량으로부터 방전되어 제2충전용량(통상적으로 SOC 50%)에 도달하게 되면 더 이상 방전되지 않도록 하고 태양광장치에서 발전된 전기를 배터리에 충전시키도록 획일적인 운전을 하고 있으며, 배전계통과 연계된 운전효율에 관한 고려가 전혀 없이 단순히 배터리의 충방전상태만을 고려한 태양광 에너지 관리시스템이다.However, in such a conventional technology, when the first charging capacity is close to the maximum charging capacity (typically 80% of the SOC and 80% of the state of charge), it is recognized that the battery is overcharged so that electricity generated from the sunlight is no longer charged in the battery Discharge. Further, when the battery is discharged from the first charging capacity and reaches the second charging capacity (typically, SOC 50%), the battery is no longer discharged and the battery is charged with electricity generated from the solar battery. Is a solar energy management system that considers only the charging / discharging state of the battery without considering the operation efficiency associated with the battery.

따라서 종래기술에서는 태양광 모듈에서 발전되는 발전전기를 배전계통에 공급할 때에 발전전기의 공급장치에 대한 출력비율에 대한 고려가 전혀 이루어져 있지 않기 때문에 비효율적인 운전이 이루어지게 된다. 즉, 날씨 변동이 있는 경우에도 발전전기의 공급장치가 동일한 양으로 배전계통에 전기를 공급하게 됨으로써 단시간 내에 배터리가 과방전 상태에 이르게 되는 등 한가지 요소만을 고려함으로써 효율적이 못한 운영이 이루어지게 된다.Therefore, in the prior art, when the generated electricity generated in the solar module is supplied to the distribution system, the output ratio to the supply device of the generated electricity is not considered at all, and thus the operation is inefficient. That is, even when there is a change in the weather, the supply device of the electricity generator supplies the electricity to the power distribution system in the same amount, so that the battery reaches the over discharge state in a short time.

본 발명의 해결과제는 배터리에너지저장장치(BESS: Battery Energy Storage System)를 적정용량으로 유지하고, 배전계통에 발전전기를 공급하는 양방향전력변환부(Power Condition System; PCS)를 발전전기량에 따라 적합하게 운전함으로써 태양광 발전모듈, BESS, 배전계통(Grid)을 최적효율로 운전하기 위한 것이다.SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and provides a bidirectional power condition system (PCS) that maintains a battery energy storage system (BESS) at an appropriate capacity and supplies power generation electric power to a power distribution system, To operate the solar power generation module, BESS, and distribution system (Grid) with optimal efficiency.

본 발명의 다른 해결과제는 BESS의 충전용량을 정격용량에 근접하게 유지되도록 태양광 발전모듈 및 배전계통을 운전하기 위한 것이다.Another object of the present invention is to operate the PV module and distribution system so that the charging capacity of the BESS is kept close to the rated capacity.

본 발명의 다른 해결과제는 첨두부하문제를 해결하기 위하여 태양광 발전모듈이 전담해야하는 야간 조명부하가 설치될 때, BESS를 탄력적으로 운전하도록 함으로써 전력계통을 안정시키고 BESS의 배터리들의 손상을 방지하도록 하기 위한 것이다.Another object of the present invention is to stabilize the power system and to prevent the damage of the BESS batteries by operating the BESS flexibly when a night lighting load is installed, in which the PV module must be dedicated, in order to solve the peak load problem .

본 발명의 다른 해결과제는 배전계통의 심야전력을 BESS에 충전하도록하고, 첨두부하시에 배전계통에 전력을 공급함으로써 배전계통을 안정화시키고, 태양광 발전모듈을 더욱 효율적으로 활용하도록 하며, 전력계통을 경제적으로 운용하도록 하기 위한 것이다.Another object of the present invention is to provide a solar power generation system in which the night power of the power distribution system is charged to the BESS and the power distribution system is supplied with electric power at the peak load to stabilize the power distribution system and utilize the solar power generation module more efficiently, To operate economically.

본 발명의 또 다른 해결과제는 본 발명의 실시예를 통하여 설명하기로 한다. [0027] Still another object of the present invention is to provide an embodiment of the present invention.

상기 과제를 해결하기 위한 본 발명의 해결수단은 태양광 발전모듈; 상기 태양광 발전모듈에서 발생된 전기를 기설정된 전압의 발전전기로 변환하는 DC-DC 컨버터; 상기 발전전기를 충전하는 배터리에너지저장부(Battery Energy Storage System: BESS); 상기 발전전기 또는 상기 BESS의 충전전기를 기설정된 출력으로 배전계통에 방전하거나, 상기 배전계통의 전기를 상기 BESS에 충전하는 양방향전력변환부(Power Condition System; PCS); 상기 BESS와 상기 PCS와 연결되고, 상기 BESS의 충전상태에 따라서 상기 발전전기 또는 상기 BESS의 충전전기를 상기 PCS를 통하여 상기 배전계통으로 방전시키거나, 상기 배전계통의 전기를 상기 BESS에 충전시키도록 상기 PCS를 제어하는 에너지관리부(Energy Management Controller: EMC)를 포함하고, 상기 EMC는 상기 BESS의 충전상태(SOC; State Of Charge)가 과충전 경계값인 기설정된 제1충전용량 이상인 경우 상기 PCS를 기설정된 출력으로 상기 배전계통에 방전하고, 상기 SOC가 상기 제1충전용량 미만이며 과방전 경계값인 제2충전용량 이상인 경우 상기 PCS 출력 대비 상기 발전전기가 많게 되면 상기 발전전기를 상기 PCS를 기설정된 출력으로 운전하고 남는 발전전기를 상기 BESS에 충전하고, 상기 PCS 출력대비 상기 발전전기가 부족하게 되면 상기 제2충전용량까지 상기 PCS 출력은 기설정된 출력으로 변동없이 공급하며, 상기 SOC가 상기 제2충전용량 이하이면 상기 PCS를 준비상태모드로 정지시키고 상기 발전전기 전량을 상기 BESS에 충전하며, 상기 배전계통에는 야간에 상기 PCS 출력에 의하여 점등되는 조명부하를 포함하고, 상기 EMC는 상기 SOC가 상기 제2충전용량 보다 낮으며 상기 BESS가 손상여부의 경계값인 제3충전용량 이하인 경우에는 상기 PCS 출력에 의하여 조명부하를 점등시키지 않고, 상기 SOC가 상기 제2충전용량 이하이고, 상기 제3충전용량을 초과하는 경우에는 상기 PCS를 준비상태모드에서 해제시켜 상기 PCS를 구동시켜 상기 조명부하를 점등시키는 것이다.
According to an aspect of the present invention, A DC-DC converter for converting the electricity generated by the solar power generation module into electricity of predetermined voltage; A battery energy storage system (BESS) for charging the generated electricity; A bi-directional power condition system (PCS) for discharging the electricity generated by the power generation or charging electricity of the BESS to a power distribution system with a preset output or charging the electricity of the power distribution system to the BESS; The BESS is connected to the BESS and the PCS, and the charging electricity of the electricity generator or the BESS is discharged to the distribution system through the PCS or the electricity of the distribution system is charged to the BESS in accordance with the state of charge of the BESS And an energy management controller (EMC) for controlling the PCS, wherein the EMC is configured to control the PCS in a case where the state of charge (SOC) of the BESS is equal to or greater than a preset first charge capacity, If the SOC is less than the first charge capacity and is equal to or greater than a second charge capacity which is an over discharge boundary value, The power generation electric power remaining in the BESS is charged to the BESS, and when the power generation electricity is insufficient as compared with the PCS output, The PCS is stopped in the ready state mode and the electric power generation amount is charged to the BESS, and when the SOC is equal to or less than the second charge capacity, And the EMC is controlled such that the lighting load is turned on by the PCS output when the SOC is lower than the second charging capacity and the BESS is equal to or lower than a third charging capacity, And when the SOC is equal to or less than the second charge capacity and exceeds the third charge capacity, the PCS is released from the ready state mode and the PCS is driven to light the illumination load.

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상기 과제와 해결수단을 갖는 본 발명에 따르면, 태양광 발전모듈에서 발전전기가 발생되는 동안에 PCS를 설정된 출력으로 운전하고, BESS의 배터리에 적정한 용량으로 충전시킴으로써 태양광 발전모듈을 효율적이며, 안정되게 운전하고, 배전계통에 많은 전기를 공급할 수 있도록 한다.According to the present invention having the above-described problems and solutions, it is possible to efficiently and stably supply the solar power generation module by operating the PCS with a predetermined output while charging the battery of the BESS with a proper capacity while generation electricity is generated in the solar power generation module And to supply a lot of electricity to the power distribution system.

또한 PCS로 야간에 점등해야되는 조명부하가 연결되어 있을 때 과방전 상태에서도 BESS의 배터리가 손상되지 않은 범위 내에서 방전하도록 하여 조명부하를 점등시킴으로써 첨두부하시에 점등되게 되는 조명부하로 인하여 배전계통에 부하를 경감시킬 수 있다.In addition, when the lighting load to be lit at night is connected by the PCS, the lighting of the BESS battery is discharged in an undamaged range even in the overdischarged state, so that the lighting load is turned on, The load can be reduced.

또한 조명부하가 점등되지 않는 심야시간대에 BESS의 배터리에 충전 여력이 있는 경우에 배전계통으로부터 전기를 공급받아 배터리를 충전시키도록 함으로써 전체 전력계통을 안정적이며, 경제적으로 운전할 수 있도록 한다. Also, when the battery of the BESS is available for charging in the nighttime when the lighting load is not turned on, the power is supplied from the power distribution system to charge the battery, thereby stably and economically operating the entire power system.

도 1은 본 발명의 전체적인 구성을 설명하는 블록도이다.
도 2는 도 1의 EMC의 회로블록도이다.
도 3, 도 4는 본 발명의 SOC 상태에 따른 PCS 발전량 제어 서브루틴의 순서도이다.
도 5는 본 발명에서 조명부하를 운전하는 운전방법과 BESS의 심야전력 충전방법에 대한 순서도이다.1 is a block diagram illustrating the overall configuration of the present invention.
Fig. 2 is a circuit block diagram of the EMC of Fig. 1. Fig.
3 and 4 are flowcharts of the PCS power generation amount control subroutine according to the SOC state of the present invention.
FIG. 5 is a flow chart of a method of operating a lighting load and a method of charging a night power of a BESS in the present invention.

이하, 첨부된 도면에 따라서 본 발명의 실시예를 설명하기로 한다.Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명의 전체적인 구성을 설명하는 블록도이다.1 is a block diagram illustrating the overall configuration of the present invention.

본 발명의 태양광 에너지 관리시스템은 태양전지판이 집적되어 전기를 발생시키는 태양광 발전모듈(11)과, 태양광 발전모듈(11)로부터 발생된 전기를 집전하는 집전함(12)과, 전기를 충전하는 배터리들과 배터리들에 발전전기를 안전하게 충전시키는 충전회로들로 이루어진 배터리에너지저장부(BESS: Battery Energy Storage System)(14)와, 집전함(12)에서 집전된 전기를 BESS(14)에 충전시키는 발전전기로 변환하는 DC-DC 컨버터(13), DC-DC 컨버터(13)로부터 출력되는 발전전기와 BESS(14)의 방전전원을 배전계통(Grid)에 공급하거나, 배전계통으로부터 전기를 공급받아 BESS를 충전시키는 양방향전력변환부(PCS: Power Condition System)(15)와, BESS(14)의 충전량에 따라서 PCS(15)의 출력관리 및 운전을 제어하는 에너지관리부(Energy Management Controller)(16)로 이루어진다.The solar energy management system of the present invention comprises a solar power generation module 11 for integrating solar panels to generate electricity, a current collecting box 12 for collecting electricity generated from the solar power generation module 11, A battery energy storage system (BESS) 14 comprising charging batteries and charging circuits for safely charging the batteries with electricity generated by the BESS 14, DC converter 13 that supplies power to the power distribution system Grid from the power generation electric power output from the DC-DC converter 13 and the discharge power of the BESS 14, A power condition system (PCS) 15 for charging the BESS and charging the BESS and an energy management controller 15 for controlling the output management and operation of the PCS 15 according to the charged amount of the BESS 14, (16).

또한 배전계통(Grid)에는 PCS에서 출력되는 전기를 이용하여 야간 시간대, 예를 들어 PM6:00~ PM10:00, 에 점등되어야 하는 조명부하(17)를 포함하고 있다.In addition, the power distribution system Grid includes an illumination load 17 that should be lit at nighttime, for example, PM6: 00 to PM10: 00, using electricity output from the PCS.

또한 PCS(15)가 배전계통(Grid)로부터 전기를 공급받아 BESS를 충전시키는 심야시간대는 조명부하(17)를 점등시간이 종료된 후의 야간 시간대이로 배전계통의 전력소모가 낮은 시간대이다.The night time zone during which the PCS 15 receives electricity from the power grid Grid and charges the BESS is the nighttime zone after the lighting time period ends, which is the time when the power consumption of the distribution system is low.

도 2는 도 1의 EMC의 회로블록도이다.Fig. 2 is a circuit block diagram of the EMC of Fig. 1. Fig.

본 발명에서 EMC(16)는 운영체제를 담당하고, 내, 외부의 제어대상들을 제어하는 제어모듈(161), PCS(15)의 출력이 시간대별로 설정되는 출력설정부(162)와, BESS의 충전량, 태양광발전모듈(11)의 발전량, 설정된 출력량들에 따라서 BESS의 충전량과 PCS(15)의 출력량을 적절하게 조합하여 운전하는 운전모듈(163)으로 이루어진다.In the present invention, the EMC 16 is provided with a control module 161 for controlling internal and external control objects, an output setting section 162 for setting the output of the PCS 15 for each time zone, A driving module 163 for appropriately combining the charged amount of the BESS and the output amount of the PCS 15 according to the power generation amount of the solar power generation module 11 and the set output amount.

출력설정부(162)는 날씨상태와 BESS(14)의 충전상태에 따라서 태양광발전모듈(11)로부터의 발전된 에너지를 PCS(15)가 GRID에 방전할 량을 결정한다. 다음의 표1은 각각의 날씨와 시간대에 따라서 PCS 출력량을 설정한 예이다.The output setting unit 162 determines the amount by which the PCS 15 discharges the generated energy from the solar power generation module 11 to the GRID according to the weather condition and the charging state of the BESS 14. [ Table 1 below shows an example of setting the PCS output amount according to each weather and time zone.

A시간(AM11:00~PM12:30)A time (AM11: 00 ~ PM12: 30) B시간(AM12:30~PM2:30)B time (AM12: 30 ~ PM2: 30) C시간(PM2:30~PM4:00)C time (PM2: 30 ~ PM4: 00) 맑은날Sunny day 10 kw10 kW 30 kw30 kW 10 kw10 kW 흐린날Cloudy day 5 kw5 kW 5 kw5 kW 5 kw5 kW 비ratio 0 kw0 kw o kwo kw 0 kw0 kw

표1에서 날씨는 3가지로 분류하였으며, 사용자 지정에 따라서 사용자가 임의로 시간대에 따라서 출력량을 설정하는 것이다.In Table 1, the weather is classified into three categories, and the user sets the amount of the output according to the user's designation according to the time zone.

표1과 같이 출력설정부(162)에 설정될 때 운전모듈(163)은 PCS(15)의 출력량을 날씨상태와 A, B, C 시간대별로 다르게 설정하게 된다. 또한 운전모듈(163)은 동일한 날씨와 동일한 시간대인 경우라도 BESS(14)의 충전상태(SOC: State Of Charge)가 제2충전용량(통상적으로 최대충전량의 50%, 이하 'SOC50%'로 표기) 이하로 떨어지는 과방전상태와, 제1충전용량인(SOC80%로 설정)이상의 과충전 상태, 제1충전용량과 제2충전용량 사이에 있는지에 따라서 PCS(15)를 다르게 운전한다.When set in the output setting unit 162 as shown in Table 1, the operation module 163 sets the output amount of the PCS 15 differently according to the weather condition and the A, B, and C time zones. In addition, the operation module 163 may determine that the state of charge (SOC) of the BESS 14 is equal to or less than the second charge capacity (typically 50% of the maximum charge, ), An overcharged state which is the first charging capacity (set at SOC 80%) or more, and a first charging capacity and a second charging capacity, the PCS 15 is operated differently.

도 3, 도 4는 본 발명의 SOC 상태에 따른 PCS 발전량 제어 서브루틴의 순서도이다.3 and 4 are flowcharts of the PCS power generation amount control subroutine according to the SOC state of the present invention.

운전모듈(163)은 BESS(14)가 SOC80% 미만인지, 이상 인지를 검출하여 이상인 경우에는 PCS출력을 출력설정부(162)에서 설정된 값의 100%로 출력되도록 한다(S11), (S12). 만일 태양광 발전모듈(11)에 발전되는 발전량이 PCS 출력 미만인 경우에는 BESS(14)에서 부족량 만큼 입력받아 배전계통(Grid)에 방전한다(S13), (S14). 또한 S14, S15 단계 후에는 처음 단계S11로 복귀하여 순환한다. 또한 단계S11에서 SOC80% 미만이면 SOC50%를 초과하거나 이하인지를 검출하여 초과하면 PCS출력대비 발전량이 부족한지를 검출하고(S21), (S24), 부족하게 되면 도 4의 31번을 수행하고, 부족하지 않게 되면 태양광 발전모듈(11)의 발전량 중 PCS 출력 100%를 배전계통으로 방전하고, 남은 량을 BESS(14)에 충전시킨 후(S25) 단계11로 복귀한다. The operation module 163 detects whether the BESS 14 is less than or equal to 80% of the SOC and outputs the PCS output as 100% of the set value in the output setting unit 162 (S11) . If the power generation amount generated by the solar power generation module 11 is less than the PCS power, the power is supplied to the power distribution grid Grid by the BESS 14 in step S13. After steps S14 and S15, the process returns to the first step S11 and circulates. If it is determined in step S11 that the SOC is less than 80%, then it is detected whether or not the SOC is more than 50%, and if the SOC is less than 80%, it is detected in step S21 if the power generation amount is insufficient relative to the PCS output. The PCS output 100% of the power generation amount of the solar power generation module 11 is discharged to the power distribution system, and the remaining amount is charged in the BESS 14 (S25), and then the process returns to step 11.

SOC50% 이하이면 PCS(15)를 준비상태모드(Standby Mode)로 전환하고, 출력을 정지하는 50%충전프래그를 ON(50%충전프래그가 온되는 경우에는 발전전기가 전부 충전에 사용됨) 상태로 하고(S22), 태양광 발전모듈(11)을 통해서 발전되는 모든 발전전기를 BESS(14)에 충전시킨 후에(S23) S11단계로 복귀한다.If the SOC is less than 50%, the PCS (15) is switched to the standby mode and the 50% charge flag for stopping the output is turned on (if the 50% charge flag is on, (S22). After charging the BESS 14 with all generated electricity generated through the photovoltaic power generation module 11 (S23), the process returns to step S11.

단계 S24에서 PCS출력 대비 발전전기가 부족한 경우에는 도 4에 도시된 바와 같이 50%충전플래그가 온된 상태에서는 계속 충전이 이루어지기 때문에 단계S31을 계속 수행하게 되고, 50%충전플래그가 오프된 상태에서는 BESS(14)의 충전량에 따라서 PCS(15)의 출력값이 다르게 설정되게 된다. 만일 SOC70%인 경우라면 표1에서 설정된 PCS출력의 80%로 설정되고, 부족한 발전량 만큼 BESS(14)로부터 입력받아 방전하고, SOC70미만이고 SOC60% 이상이면 표1의 PCS 설정출력의 50%를 설정하고 부족한 발전량만큼 BESS(14)에서 입력받아 배전계통에 방전한다. 또한 SOC60% 미만이면 PCS 출력을 표1에서 설정되는 PCS출력의 17%로 설정하고 부족한 발전량만큼 BESS(14)로부터 입력받아 배전계통으로 방전한다.In step S24, if electricity generation is insufficient as compared with the PCS output, step S31 is continued because the 50% charge flag is continuously turned on as shown in FIG. 4, and when the 50% charge flag is off The output value of the PCS 15 is set differently according to the charged amount of the BESS 14. [ If the SOC is 70%, it is set to 80% of the PCS output set in Table 1, and it is discharged from the BESS (14) by the amount of power shortage, and if it is less than SOC70 and SOC60% or more, 50% And receives power from the BESS (14) as much as the power generation amount and discharges it to the power distribution system. If the SOC is less than 60%, the PCS output is set to 17% of the PCS output set in Table 1, and the power is supplied to the power distribution system from the BESS 14 as much as the power generation amount is insufficient.

이상에서와 같이 도 3, 도 4는 BESS(14)의 배터리의 충전량과 태양광발전모듈(11)의 발전량에 따라서 PCS(15)를 운용하는 EMC(16)의 운전방법에 대하여 설명하였다. As described above, FIGS. 3 and 4 have described the operation method of the EMC 16 for operating the PCS 15 according to the charged amount of the battery of the BESS 14 and the generated amount of the solar power generation module 11. FIG.

태양광이 없는 경우 PCS(15)에 의하여 배전계통에 연결된 조명부하(17)를 점등시키는 경우 및 심야시간대의 BESS(14)의 충전방법에 대하여 설명하기로 한다.  A method of lighting the illumination load 17 connected to the power distribution system by the PCS 15 in the absence of sunlight and a charging method of the BESS 14 in the night time zone will be described.

도 5는 본 발명에서 조명부하를 운전하는 운전방법과 BESS의 심야전력 충전방법에 대한 순서도이다.FIG. 5 is a flow chart of a method of operating a lighting load and a method of charging a night power of a BESS in the present invention.

조명부하(17)에 전기를 공급하여야 되는 시간인 PM6:00∼PM10:00인지를 판별하고, 조명부하를 점등시켜야 하는 시간인 경우에는 BESS의 충전량이 제3충전용량인 SOC20%을 초과하는지 이하인지를 판별하고, 초과하는 경우에는 준비상태모드를 해제하고, 50%충전플래그를 해제하고(오프시키고), PCS의 출력을 설정한 후, PCS를 통해 조명부하(17)로 전력을 공급함으로써 BESS 전기를 방전한다(S41), (S42), (S43). 이와 같이 BESS의 SOC50% 미만인 경우에도 조명부하(17)를 점등시키기 위해서는 과방전 상태인 경우라도 태양광 시스템의 효율성을 높이기 위해서 SOC 20% 이상인 경우에는 BESS의 충전전원을 이용하여 조명부하를 점등시키지만 SOC 20% 미만인 경우에는 BESS의 배터리에 손상을 입히게 되므로 이때는 더 이상 BESS 전원을 방전시키지 않도록 한다. 또한 조명부하 점등시간대인 경우 SOC 20% 이하인 경우 PCS(15)를 준비상태모드로 전환하고 출력을 정지시킨다(S44). 조명부하의 점등시간이 아닌 경우 심야시간대인지를 판별하고(S45), 심야시간대인 경우 SOC80% 이상인 경우 PCS(15)를 준비상태모드로 전환하고 배전계통으로부터 전기가 BESS(14)에 충전되는 것을 정지하고(S46), (S47), SOC80% 미만인 경우에는 준비상태모드를 해제하고 PCS(15)를 통해 배전계통으로부터 전기를 공급받아 BESS(14)를 충전한다(S48). It is determined whether PM6: 00 to PM10: 00, which is the time for supplying electricity to the lighting load 17, and if it is time to light up the lighting load, it is determined whether the charged amount of the BESS exceeds the third charging capacity SOC20% And then sets the output of the PCS and then supplies power to the illumination load 17 via the PCS to release the 50% charge flag, Electricity is discharged (S41), (S42), and (S43). In order to increase the efficiency of the photovoltaic system even in an overdischarged state in order to light up the illumination load 17 even when the SOC of the BESS is less than 50%, the lighting load is turned on by using the charging power of the BESS when the SOC is 20% If the SOC is less than 20%, the battery of the BESS will be damaged. In this case, do not discharge the BESS power any more. If the SOC is 20% or less in the lighting load lighting time zone, the PCS 15 is switched to the ready state mode and the output is stopped (S44). (S45). If the SOC is 80% or more in the night time zone, the PCS 15 is switched to the ready state mode and electricity is charged from the power distribution system to the BESS 14 (S47). When the SOC is less than 80%, the ready state mode is canceled and electricity is supplied from the power distribution system through the PCS 15 to charge the BESS 14 (S48).

11: 태양광 발전모듈 12: 집전함
13: DC-DC 컨버터 14: BESS
15: PCS 16: EMC
162: 출력설정부 163: 운전모듈11: Photovoltaic module 12: Collector
13: DC-DC converter 14: BESS
15: PCS 16: EMC
162: output setting section 163: operation module

Claims (5)

태양광 발전모듈;
상기 태양광 발전모듈에서 발생된 전기를 기설정된 전압의 발전전기로 변환하는 DC-DC 컨버터;
상기 발전전기를 충전하는 배터리에너지저장부(Battery Energy Storage System: BESS);
상기 발전전기 또는 상기 BESS의 충전전기를 기설정된 출력으로 배전계통에 방전하거나, 상기 배전계통의 전기를 상기 BESS에 충전하는 양방향전력변환부(Power Condition System; PCS);
상기 BESS와 상기 PCS와 연결되고, 상기 BESS의 충전상태에 따라서 상기 발전전기 또는 상기 BESS의 충전전기를 상기 PCS를 통하여 상기 배전계통으로 방전시키거나, 상기 배전계통의 전기를 상기 BESS에 충전시키도록 상기 PCS를 제어하는 에너지관리부(Energy Management Controller: EMC)를 포함하고,
상기 EMC는 상기 BESS의 충전상태(SOC; State Of Charge)가 과충전 경계값인 기설정된 제1충전용량 이상인 경우 상기 PCS를 기설정된 출력으로 상기 배전계통에 방전하고, 상기 SOC가 상기 제1충전용량 미만이며 과방전 경계값인 제2충전용량 이상인 경우 상기 PCS 출력 대비 상기 발전전기가 많게 되면 상기 발전전기를 상기 PCS를 기설정된 출력으로 운전하고 남는 발전전기를 상기 BESS에 충전하고, 상기 PCS 출력대비 상기 발전전기가 부족하게 되면 상기 제2충전용량까지 상기 PCS 출력은 기설정된 출력으로 변동없이 공급하며, 상기 SOC가 상기 제2충전용량 이하이면 상기 PCS를 준비상태모드로 정지시키고 상기 발전전기 전량을 상기 BESS에 충전하며,
상기 배전계통에는 야간에 상기 PCS 출력에 의하여 점등되는 조명부하를 포함하고, 상기 EMC는 상기 SOC가 상기 제2충전용량 보다 낮으며 상기 BESS가 손상여부의 경계값인 제3충전용량 이하인 경우에는 상기 PCS 출력에 의하여 조명부하를 점등시키지 않고, 상기 SOC가 상기 제2충전용량 이하이고, 상기 제3충전용량을 초과하는 경우에는 상기 PCS를 준비상태모드에서 해제시켜 상기 PCS를 구동시켜 상기 조명부하를 점등시키는 것을 특징으로 하는 태양광 에너지 관리시스템.
PV modules;
A DC-DC converter for converting the electricity generated by the solar power generation module into electricity of predetermined voltage;
A battery energy storage system (BESS) for charging the generated electricity;
A bi-directional power condition system (PCS) for discharging the electricity generated by the power generation or charging electricity of the BESS to a power distribution system with a preset output or charging the electricity of the power distribution system to the BESS;
The BESS is connected to the BESS and the PCS, and the charging electricity of the electricity generator or the BESS is discharged to the distribution system through the PCS or the electricity of the distribution system is charged to the BESS in accordance with the state of charge of the BESS And an energy management controller (EMC) for controlling the PCS,
The EMC discharges the PCS to the power distribution system with a predetermined output when the state of charge (SOC) of the BESS is equal to or greater than a preset first charge capacity which is an overcharge threshold value, When the power generation electric power is higher than the PCS output, charging the power generation electricity remaining in the power generation electric power to the PCS to a preset power to the BESS, If the SOC is equal to or less than the second charge capacity, the PCS is stopped in the ready state mode, and if the SOC is less than the second charge capacity, Charging the BESS,
Wherein the power distribution system includes an illuminating load illuminated by the PCS output at night, and wherein the EMC is set such that when the SOC is lower than the second charging capacity and the BESS is equal to or less than a third charging capacity, When the SOC is equal to or less than the second charge capacity and exceeds the third charge capacity, the PCS is released from the ready state mode and the PCS is driven to turn on the light load And the light source is turned on.
삭제delete 청구항1에 있어서 상기 PCS의 기설정된 출력은 시간대에 따라서 다르게 설정되어 상기 EMC에 저장되는 것을 특징으로 하는 태양광 에너지 관리시스템. The solar energy management system according to claim 1, wherein the predetermined output of the PCS is set differently according to a time zone and stored in the EMC. 청구항 1에 있어서, 상기 EMC가 상기 배전계통의 전기를 상기 BESS에 충전시키도록 하는 시간은 심야시간대인 것을 특징으로 하는 태양광 에너지 관리시스템.

The solar energy management system according to claim 1, wherein the time for the EMC to charge the electricity in the distribution system to the BESS is in the night time zone.

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KR20190106314A (en) * 2018-03-08 2019-09-18 (주)삼도전기에너지 Solar photovoltaic generation system
US10693304B2 (en) 2017-08-17 2020-06-23 Industry-Academic Cooperation Foundation, Yonsei University Energy storage system with improved operating time and operation method thereof

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JP2006149037A (en) * 2004-11-17 2006-06-08 Seiko Electric Co Ltd Power storage system
JP2012095465A (en) * 2010-10-27 2012-05-17 Chugoku Electric Power Co Inc:The System power stabilization system, system power stabilization method, and charger/discharger

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Publication number Priority date Publication date Assignee Title
JP2006149037A (en) * 2004-11-17 2006-06-08 Seiko Electric Co Ltd Power storage system
JP2012095465A (en) * 2010-10-27 2012-05-17 Chugoku Electric Power Co Inc:The System power stabilization system, system power stabilization method, and charger/discharger

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10693304B2 (en) 2017-08-17 2020-06-23 Industry-Academic Cooperation Foundation, Yonsei University Energy storage system with improved operating time and operation method thereof
KR20190106314A (en) * 2018-03-08 2019-09-18 (주)삼도전기에너지 Solar photovoltaic generation system
KR102137304B1 (en) * 2018-03-08 2020-07-23 (주)삼도전기에너지 Solar photovoltaic generation system

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