KR101478791B1 - Method and System for Power Management - Google Patents

Method and System for Power Management Download PDF

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KR101478791B1
KR101478791B1 KR20120135175A KR20120135175A KR101478791B1 KR 101478791 B1 KR101478791 B1 KR 101478791B1 KR 20120135175 A KR20120135175 A KR 20120135175A KR 20120135175 A KR20120135175 A KR 20120135175A KR 101478791 B1 KR101478791 B1 KR 101478791B1
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power
information
battery
power consumption
generation system
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KR20120135175A
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Korean (ko)
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KR20140067654A (en
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김재성
도완석
신슬기
김형섭
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에스케이씨앤씨 주식회사
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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 or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks via a high-tension DC link, HVDC transmission

Abstract

The present invention relates to a power management method and system, and more particularly, to a power management system and a power management system, And a power management method and system for establishing an operation plan of the battery.
In order to achieve the above object, a power management method according to the present invention includes: obtaining power consumption demand information, acquiring battery type and characteristic information, acquiring type and characteristic information of a renewable energy generation system, Includes planning steps.
The method may further include acquiring environmental information from an external server, estimating power consumption using the environmental information, and acquiring production power prediction information that predicts an amount of power generated from the renewable energy generation system can do.
Meanwhile, the power management system according to the present invention includes an external information acquisition unit, a device characteristic information acquisition unit, an information storage unit, a power prediction unit, a power operation planning unit, and a power operation unit.

Description

METHOD AND SYSTEM FOR POWER MANAGEMENT

The present invention relates to a power management method and system, and more particularly, to a power management system and a power management system, And a power management method and system for establishing an operation plan of the battery.

The power storage system uses the power generation system in conjunction with the grid so that when sufficient power is generated from the power generation system, power is supplied to the load, some power is transmitted to the grid, and the battery is charged in some cases.

The power generation system has been widely commercialized by using energy such as solar, solar, wind, tidal, or geothermal power as renewable energy is highlighted due to exhaustion of fossil fuels and environmental problems.

In addition, ESS (Energy Storage System) is a concept that is a combination of renewable energy generation system represented by solar power and electric power storage system. It stores surplus power of renewable energy and system through battery and supplies it to load .

However, conventionally, when an abnormal situation occurs in the system, there is a problem that the power can not be supplied to the load when the power stored in the battery is insufficient when the abnormal state occurs in the system continuously while the insufficient power is supplied as the power stored in the battery.

Also, the power operation using the battery as an energy storage source is performed based on the remaining battery level, and it is impossible to operate the power resiliently due to changes in the surrounding environment or policy.

In particular, after the 2011 earthquake in Tohoku, nuclear power generation has been questioned due to the suspicion of nuclear power generation, and Japan has been carrying out planned power outages locally. In countries where power supply is not smooth (eg, Southeast Asia and China) The planned power outage is also being carried out on the industrial power of.

Accordingly, in the case of a planned power outage, it is required to find a way to integrate the power management with the economic power as well as the power supply during the power outage through the power operation plan.

Korean Registered No. 1097261, entitled " Power Storage System and Control Method "thereof, discloses a power storage system and a control method associated with the power generation system and the system. When the remaining power of the battery is insufficient in a quasi-steady state of the system, Power is directly supplied from the system and the battery is charged, so that power is supplied stably to the load even if the abnormal situation subsequently occurs again.

However, the above prior art has the advantage of supplying power to the load stably when an abnormal situation occurs in the system, but it has a drawback in that it can not cope with the change of the surrounding environment.

Accordingly, it is possible to more efficiently manage the storage and consumption of energy by predicting future consumption / production power in consideration of the power consumption demand information and environment information, which are the advantages of the invention, as well as the type and characteristic information of the battery and the renewable energy generation system Technology is required.

Korean Patent No. 1097261

The present invention relates to a system and method for controlling energy consumption / consumption of a power load, environmental information required for generating renewable energy, current energy production / consumption and future energy production / consumption, .

In addition, it aims to increase the efficiency of energy use by obtaining the predicted production power of new and renewable energy using environmental information, and cope with emergency situation and power fluctuation situation flexibly.

It also aims at establishing periodic and seasonal power generation plans by predicting power consumption and production power, and taking into account the types and characteristics of battery and renewable energy generation systems.

In addition, in renewable energy generation systems such as solar power generators, wind power generators, and biomass, which produce new and renewable energy, the power generation system is selected and operated in consideration of characteristics and environmental information of each power generation system, It aims to produce.

On the other hand, various types of batteries such as a rechargeable battery including a flow battery, a fly wheel, NAS, an all solid battery as well as a commonly known lithium-ion battery have different charging and discharging principles. Of course, charging and discharging conditions that operate efficiently differ. In addition, the above various batteries have special operating conditions (for example, a flow battery strip operation) that must be considered when operating in order to effectively maintain the performance and increase the efficiency of charging and discharging. Therefore, when the power demand condition and the environmental condition are given, it is judged comprehensively the specific operating conditions of each kind of battery, and it is judged which battery is suitable for charging or discharging energy according to the situation, And to increase the efficiency of energy storage and consumption.

Another object of the present invention is to establish a short-term operation plan by calculating the charge / discharge time of the battery according to the necessity of charging the battery using the type of battery, characteristic information and remaining capacity information.

In order to achieve the above object, a power management method according to the present invention includes: obtaining power consumption demand information, acquiring battery type and characteristic information, acquiring type and characteristic information of a renewable energy generation system, Includes planning steps.

The method may further include acquiring environment information from an external server, estimating power consumption using the environment information, and acquiring production power prediction information that predicts an amount of power generated from the renewable energy generation system can do.

In addition, the type and characteristic information of the battery include basic operation conditions (voltage, current and temperature conditions for basic operation) according to the type of the battery, special operation modes for efficient operation (for example, strip operation Etc.), or a cost for maintaining stored energy (a superconductor cooling cost for operating a fly wheel battery, a heating cost for operating a NAS battery). In this case, in the step of establishing the operation plan, a battery for storing energy produced in the renewable energy generation system may be selected in consideration of the type and characteristic information of the battery, and the operation plan may be established based on the selected battery. The process of selecting a battery may be based on a predetermined schedule and schedule. That is, in the short-term plan, the selection and operation plan of the battery can be established in a unit of one day to one week, and in the long-term plan of one month or longer considering seasonal factors, Also, in the process of selecting the battery, the ease of coupling between the renewable energy generation system and the battery can be considered.

Meanwhile, the power management system according to the present invention includes an external information acquisition unit, a device characteristic information acquisition unit, an information storage unit, a power prediction unit, a power operation planning unit, and a power operation unit.

The external information acquiring unit acquires power consumption demand information and environmental information. The apparatus characteristic information acquiring unit acquires the type and characteristic information of the new and renewable energy generation system and the battery. The information storage unit stores information obtained by the external information obtaining unit and the device characteristic information obtaining unit. The power predicting unit predicts power consumption and production power using information of the information storage unit. The Power Operation Planning Department uses the information stored in the information storage section to establish a power operation plan. The power operation department operates the power according to the operation plan of the power operation planning department.

The present invention relates to a system and method for controlling energy consumption / consumption of a power load, environmental information required for generating renewable energy, current energy production / consumption and future energy production / consumption, .

In addition, it is possible to flexibly cope with an emergency situation and a power fluctuation situation by predicting future consumption / production power by using past and present power consumption information and environment information.

In addition, the solar generator or wind turbine that produces new and renewable energy can be operated more efficiently by choosing the generator depending on environmental information, and it is possible to establish short, medium or long term plans. have.

In addition to general lithium ion batteries, special conditions for various types of batteries such as Flow Battery, Fly Wheel, NAS, and all solid state batteries are considered. It is possible to increase the efficiency of energy storage and consumption by selecting and operating more suitable ones.

In addition, there is an effect that a short-term operation plan can be established by calculating the charge / discharge required time of the battery depending on whether the battery is charged or not using the type of battery, characteristic information, and remaining capacity information.

1 is a diagram showing a schematic configuration of a power management method and system of the present invention.
2 is a schematic flow diagram of a power management method of the present invention.
3 is a diagram showing a flow of steps for predicting the power consumption of the present invention.
4 is a flowchart showing a step of predicting the production power of the present invention.
5 is a diagram illustrating a flow of emergency power operation according to an embodiment of the present invention.
6 is a diagram illustrating a power operation flow according to the battery discharge time according to an embodiment of the present invention.
FIG. 7 is a detailed block diagram of the EMS server shown in FIG. 1 according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the following description of the embodiments of the present invention, specific values are only examples.

1 is a diagram showing a schematic configuration of a power management method and system of the present invention.

Referring to FIG. 1, the present invention includes a renewable energy generation system 110, a solar power 111, a wind power 112, a flow battery 113, a secondary battery 114, a power load 120, an ESS A storage system 130, a PCS (Power Conditioning System) 131, a BMS (Battery Management System) 132, a battery 140, a power grid 150, an EMS (Energy Management System) server 160, 170, a power server 180, and a weather server 190. On the other hand, in FIG. 1, a solid line represents a power line through which power is transferred, and a dotted line represents a wired / wireless communication network.

The renewable energy generation system 110 is a power generation facility using renewable energy such as solar light, wind power, tidal power, biomass, etc. In the present invention, various information such as power consumption prediction, environmental information, In order to produce the most efficient electric power, the electric power is produced by selecting and operating various kinds of generators considering the types and characteristics of the renewable energy generation system.

In other words, the analysis using various information shows that if only the solar generator is operated efficiently, only the solar generator is used, and if the solar generator and the wind generator are operated at the same time, All of them will be used. In this way, various types of generators are selectively operated to produce the most efficient power. The power load 120 is a facility for homes, buildings, factories, etc. that consume power.

The ESS 130 is an energy storage device that stores energy by charging the battery 140 and discharges the battery 140 to supply the stored energy to the power load 120 or the power grid 150. FIG. A PCS (Power Conditioning System) 131, a BMS (Battery Management System) 132, and a battery 140, as shown in FIG.

The battery 140 includes various kinds of batteries such as a Flow Battery 113, a secondary battery 114, and the like. Also, although not shown in FIG. 1, the battery 140 may include a flywheel using a superconductor, a NAS, an all solid-state battery, or the like. The characteristics and detailed operation of the various batteries 140 such as the flow battery 113 and the secondary battery 114, fly wheel, NAS, and all solid-state batteries will be described later. Accordingly, in the present invention, a short-term power operation plan is established by establishing a battery charge / discharge plan efficiently by using the type and characteristic information of the battery and additionally obtaining remaining capacity information of the battery.

The PCS 131 is a power conversion device, and serves to convert AC, DC, and voltage, current, and frequency.

The PCS 131 also supplies the power supplied from the power plant 170 to the power load 120 or charges the battery 140 through the power grid 150 and the power supplied from the renewable energy generation system 110 And supplies the stored energy to the power load 120 or the battery 140 and discharges the battery 140 to supply the stored energy to the power load 120 or the power grid 150 to perform power management . At this time, charging / discharging of the battery 140 is operated in consideration of the type and characteristic information of the battery 140.

In addition, the PCS 131 monitors the power consumed in the power load 120 and stores it as information. Accordingly, in the present invention, the EMS 160 establishes a power operation plan using the monitored power consumption information held in the PCS 131. [

The BMS 132 is a battery management system that detects the voltage, current, temperature, and the like of the battery to control the charge / discharge amount of the battery 140 to an appropriate level, performs cell balancing of the battery 140, The remaining capacity of the battery 140 is determined. In addition, the BMS 132 protects the battery 140 through an emergency operation when a danger is detected.

The battery 140 also has a function of storing energy by charging the power supplied through the renewable energy generation system 110 or the power grid 150, And serves as an energy source for supplying power to the power grid 150.

The remaining capacity information of the battery is obtained from the BMS 132 and the charging / discharging of the battery 140 is managed in consideration of the type and characteristics of the battery 140 such as the flow battery 113 and the secondary battery 114 Thereby establishing an efficient power operation plan.

The power server 180 is a server that operates in a power control station of a power supply organization that manages power generation by managing power generation / transformation / transmission / distribution and the like. It controls and manages the status of power generation by the power plant 170, And is responsible for spreading the planned power outage established by

Accordingly, the present invention establishes a plan for power operation by obtaining power consumption demand information including power status information, time-based power price information, scheduled power outage information, and the like from the power server 180.

The weather server 190 is a server operated by a weather station. In the present invention, the weather server 190 functions as a server for providing environmental information such as past weather information, recent weather information, weather forecast information, and seasonal information.

The EMS server 160 controls the PCS 131 and the BMS 132 of the ESS 130 using the information obtained from the power server 180 and the weather server 190. In the power system shown in FIG. 1, Of power management. That is, the EMS server 160 predicts the power consumption in the power load 120, predicts the production power in the renewable energy generation system 110, The energy utilization countermeasure is established in consideration of the types and characteristics of the energy generation system 110 and the battery 140, and the PCS 131 and the BMS 132 are controlled to operate the power.

The features and functions of the components of the present invention have been briefly described and will now be described with reference to the overall flow chart of the power management method of the present invention of FIG.

1. Obtaining external information < S200 >

Step S200 is a step of acquiring basic information necessary for power operation such as power consumption demand information and environmental information in the external information obtaining unit. Power consumption demand information such as past power consumption and recent power consumption from the external power load 120 and acquires power consumption information from the external power server 180 such as the power status information, the plan power failure information, the basic charge / discharge schedule, Information on the power consumption demand information. In addition, environmental information including past weather information, recent weather information, and weather forecast information is obtained from an external weather server 190.

2. Power Consumption Forecast < S210 >

Step S210 is a step for predicting future power consumption. This will be described with reference to FIG. First, the EMS server 160 acquires and stores power consumption demand information such as past consumption power and recent consumption power from the power load 120 through steps S211 to S212.

For the convenience of understanding and explanation of the reference date generation, the "past" power consumption information is the power consumption information of "2001 to 2011 (ten years)" and the "recent" power consumption information is the power consumption information of " Quot ;, and the "predicted " power consumption is assumed to be the power consumption of" June 2012 ". It should be noted that this embodiment is merely illustrated for convenience of explanation, But is not limited to.

In step S213, the EMS server 160 compares past power consumption information acquired and stored in the power load 120 with recent power consumption information, and calculates a comparison error with respect to power consumption. For example, in step S213, a comparison error can be calculated by comparing 'the average power consumption in May of 2001 ~ 2011' and the power consumption of 'May of 2012'.

In step S215, if the comparison error calculated in step S213 is within the threshold range (S214-Y), the EMS server 160 predicts future power consumption from past power consumption information. For example, if it is determined in step S214 that the comparison error is within 3% (threshold error), then in step S215, the EMS server 160 determines that the average consumption power from June 2001 to June 2011 Power 'can be predicted.

On the other hand, in step S216, if the comparison error calculated in step S213 is out of the threshold range (S214-N), the EMS server 160 compensates the past power consumption by adding or subtracting the compensation value to the past power consumption information.

When the comparison error is out of the threshold range in step S214, the recent power consumption differs from the past power consumption to such an extent that it is unacceptable. Therefore, the past power consumption is compensated in step S216 so as to converge to the recent power consumption to some extent.

The past power consumption compensation in step S216 is performed for all of the past power consumption information. That is, the past power consumption compensation in the step S216 is performed not on the "power consumption information on May of 2001 to 2011" but on the "power consumption information on the whole of 2001 to 2011".

Accordingly, if it is determined in step S214 that the comparison error exceeds 3% (threshold error), the EMS server 160 in step S216 adds or subtracts the compensation value to the 'power consumption information for the whole of 2001 to 2011' Power is compensated.

Specifically, when the past consumption power is smaller than the latest consumption power, the compensation value is added to the past consumption power. If the past consumption power is larger than the latest consumption power, the compensation value is subtracted from the past consumption power, .

Thereafter, the process is repeated from step S213. Nevertheless, if the comparison error calculated in step S213 is out of the threshold range (S214-N), the compensation by step S216 is performed once more.

On the other hand, if the comparison error is within the critical range due to the past power consumption compensation (S214-Y), the EMS server 160 predicts the future power consumption from the compensated past power consumption information in step S215.

In step S215, the EMS server 160 predicts the power consumption of June 2012 from the average power consumption value of June 2001 to 2011, which is compensated for and compensated for by the comparison error.

In the above embodiment, the power consumption prediction is performed in units of "month ", but this is merely an example for convenience of explanation. Therefore, power consumption prediction can be done by "minutes", "hours", "days", "weeks", periods and seasons, as needed.

Step S210 also predicts the power consumption by supplementing the power consumption demand information acquired in the power load 120 by using the environment information acquired from the weather server 190. [

A detailed description of the environment information will be described later in detail in step S230. The power consumption demand information acquired in the power load 120 may be used not only to predict future power consumption by using only the power consumption for each period as in the above embodiment but also to calculate the environmental information such as the average temperature, , It is possible to predict the future power consumption in consideration of the weather forecast.

For example, in the case of forecasting the power consumption of 'August 2012', when the weather forecast shows that the temperature of 'August 2012' will be 3 ° C higher than the normal temperature, '2001-01' We can estimate the power consumption of 'August 2012' by analyzing the power consumption data by temperature by obtaining the power consumption information according to the average temperature of August of the year.

By considering the environment information of the weather server 190 when estimating the power consumption, it is possible to predict a more accurate future power consumption in response to a change in the surrounding environment.

3. New play  Obtain information about the type and characteristics of the energy generation system < S220 >

Step S230 acquires the type and characteristic information of the renewable energy generation system 110 from the renewable energy generation system 110 in the apparatus characteristic information acquisition unit.

Once renewable energy means electrical energy converted from natural energy. Renewable energy uses natural energy such as solar, solar, wind, tidal or geothermal heat, and many solar power generation systems have been commercialized. As such, renewable energy uses natural resources that are infinitely supplied and does not cause pollution in the development process.

In the case of the photovoltaic power generation system 111, the components include a solar cell that converts solar energy into electric energy, a power conversion control unit that converts the generated electricity into a direct current to an alternating current Equipment, and a power storage device that stores the generated electricity temporarily or for a long period of time. Since the solar power generation system 111 has no mechanical or chemical action during the energy conversion process, the structure of the system is simple, requiring little maintenance, long life span of 20 to 30 years, and being safe and environmentally friendly.

The solar cell is the most essential element of the solar power generation system 111. The solar cell, which is the basic unit of the solar cell, is divided into a single crystal and a polycrystalline cell, and the size is 5 inches and 6 inches. Typically, the electrical performance of a cell is 0.5 to 0.6 V, 4 to 7.5 A, with efficiencies of 14 to 17 percent, and up to 1.5 W of electricity. Using this, a module capable of obtaining voltage of several hundred V at several V is manufactured and used.

The power conversion control device consists largely of the inverter part and the power control part. The inverter converts DC electricity generated from the solar cell into AC electricity and supplies it to the power system. The power control unit obtains maximum output from the photovoltaic module and performs electrical surveillance and protection functions on the DC and AC sides.

The power storage device is a device that temporarily stores the power generated by the system for a long period of time, and is capable of taking charge of the power load occurring at a time when the insolation is low or at the late night. In addition, the solar cell module is made in the form of one solar panel, and it is the most efficient when it is at an angle of 90 degrees with the sunlight.

For example, in the case of the power generation amount of the solar power generation system 111, the concept of the facility utilization rate is used when discussing the amount of power generation. In the case of domestic, the annual utilization rate of the 3Kw solar power generation facility is about 12-13% 3 kW * 8760 h / year * 0.13 = 3416 kWh. Power generation is multiplied by inverter efficiency per year, multiplies inverter efficiency by about 90-94%. That is, the power generation amount is 3 kW * 8760 h / year * 0.13 * 0.94 = 3211 kWh. The above specific values are only examples.

The wind power generation system 112 is a technology that supplies induction electricity generated by converting the wind force to rotational force by using a technology windmill comprising a momentum conversion device, a power transmission device, a power conversion device, and a control device to a power system or a consumer .

Wind turbines can be built if the wind intensity is more than 4 meters per second on average. The amount of wind power is proportional to the square of the blade length, and is proportional to the cube of wind speed. Therefore, the larger the generator and the stronger the wind, the more advantageous it is. The wind energy is about 1 kW at a wind speed of 10 m / s and a radius of 1 m at the wind receiving area

The wind turbine also has a control mechanism to prevent the wing from being destroyed during strong winds, and the wind turbine is designed based on the wind speed of 3 to 5 m / s. Since the average annual wind speed is less than 10 m / s, the wind energy density is approximately 150 to 200 W per 1 m 2 of the wing rotation area, approximately equal to 170 W / m 2 on the day before. Because the wind fluctuates, it is also possible to convert the wind energy into thermal energy having a large accumulation capacity, and convert the thermal energy into electrical energy. A typical example of using wind energy as a power source is a Dutch windmill. In the United States and the United Kingdom, 100 to 1,000 kW has already been put to practical use.

That is, in step S230, environment information including the weather, temperature, wind speed, and the like acquired in the weather server 190 and the type and characteristics of the renewable energy generation system 110 acquired in step S220 are taken into consideration, Lt; RTI ID = 0.0 &gt; 110 &lt; / RTI &gt;

In one embodiment, the renewable energy generation system 110 is an example of a solar power generation system using solar and wind power. However, the present invention is not limited to solar power, fuel cell, hydrogen, bio energy, waste energy, geothermal energy, And the like can also be used.

4. Production Power Forecast < S230 >

In step S230, the external information obtaining unit obtains environmental information including the past weather information, recent weather information, and weather forecast information from the weather server 190, and stores the obtained environment information and the type of the renewable energy generation system 110 And the characteristic information.

Step S230 is a step for predicting the future production power of the renewable energy generation system 110 with reference to FIG. First, the EMS server 160 acquires and stores past weather information, recent weather information, and weather forecast information from the weather server 190 through steps S231 to S233.

For the convenience of understanding and explanation, "past" weather information is temperature / wind information of "2001 ~ 2011 (10 years)", and "recent" weather information is temperature / wind information of "May 2012" , Weather forecast "forecast" is the "June 2012" weather (sunny, cloudy, rain, snow), and "forecast" production power is the production power of "June 2012".

In step S234, the EMS server 160 compares the past weather information acquired by the weather server 190 with the latest weather information to calculate a comparison error with respect to the weather information. For example, in step S234, a comparison error can be calculated by comparing 'the average temperature / wind speed in May of 2001 to 2011' and 'the temperature / wind speed of May of 2012'.

In step S236, if the comparison error calculated in step S234 is within the critical range (S235-Y), the EMS server 160 reflects the weather forecast to the past weather information to predict future production power.

For example, if it is determined in step S235 that the comparison error is within 3% (threshold error), the EMS server 160 in step S236 calculates the power that can be produced in the "average temperature / wind speed average of June 2001 to 2011" The 'production power of June 2012' can be predicted by reflecting the weather due to the weather forecast.

Reflecting weather by the weather forecast means that the produced power is adjusted according to the weather. In the case of the solar power generation system 111, if the weather is not clear, the power that can be produced is subtracted, (112), when the wind speed is small, the power that can be produced is subtracted. That is, the production power is predicted in consideration of the type and characteristic information of the renewable energy generation system 110 acquired in step S220.

On the other hand, in step S237, if the comparison error calculated in step S234 is out of the threshold range (S235-N), the EMS server 160 compensates the past weather information by adding or subtracting the compensation value to the past weather information.

When the comparison error is out of the critical range in step S235, the recent weather is different from the past weather to such an extent that it is unacceptable. Therefore, the past weather information is compensated in step S237 so as to converge to the recent weather information to some extent.

The past weather information compensation in step S237 is performed for all of the past weather information. That is, the past weather information compensation in the step S237 is performed not for the 'weather data for May 2001 to 2011' but for the 'weather data for the entire 2001 to 2011'.

Accordingly, if it is determined in step S235 that the comparison error exceeds 3% (threshold error), the EMS server 160 adds or subtracts the compensation value to the 'weather information for the whole of 2001 to 2011' in step S237, Compensate for information.

Specifically, when the past temperature / wind speed is lower than the recent temperature / wind speed, the compensation value is added to the past temperature / wind speed. If the past temperature / wind speed is larger than the recent temperature / wind speed, Converts temperature / wind speed to recent temperature / wind speed.

Thereafter, the process is resumed from step S234. Nevertheless, if the comparison error calculated in step S235 is out of the threshold range (S235-N), the compensation by step S237 is performed once more.

On the other hand, if the comparison error is within the critical range by the past weather information compensation (S235-Y), the EMS server 160 reflects the weather forecast to the compensated past weather information at step S236 to predict future production power.

For example, if it is determined that the comparison error is within 3% (threshold error) in step S235, the EMS server 160 in step S236 compares the compensated 'June to June temperature / wind speed average value' , And the 'production power of June 2012' is predicted by reflecting the weather due to the weather forecast.

In the above embodiment, the production power prediction is performed in units of "month", but this is merely an example for convenience of explanation. Therefore, the production power forecast can be "minutes", "hours", "days", "weeks", periods and seasons, as needed.

5. Battery charge / discharge decision < S240 >

The battery 140 stores the renewable energy and surplus power of the system and supplies it to the load. Therefore, when an abnormal situation occurs in the system, the power supplied to the battery is also supplied to the battery. However, there is a problem in that when the abnormal state occurs in the system continuously, the power stored in the battery becomes insufficient to supply power to the load. Therefore, the remaining capacity information of the battery 140 is acquired and taken into consideration, thereby improving such disadvantages and establishing an efficient power operation plan.

The EMS server 160 acquires remaining capacity information in addition to the type and characteristic information of the battery 140 from the BMS 132 of the ESS 130 and stores the remaining capacity information. First, in step S240, the type and characteristic information of the battery 140 are acquired.

The battery 140 includes various kinds of batteries such as a Flow Battery 113, a secondary battery 114, and the like.

The flow battery 113 is advantageous in that it can be easily manufactured at a low cost, can be used for a long time, and has a long life. However, the flow battery 113 has a disadvantage that it needs to be continuously charged for a long time in comparison with a secondary battery in order to maintain the efficiency and life of the battery.

The secondary battery 114 uses lithium-cobalt oxide on one side and graphite on the other side, and lithium ions enter the interlayer between the two electrodes in a layered structure, and charge / discharge continues. At this time, lithium-cobalt oxide is relatively stable to this movement of lithium, whereas graphite degrades layer structure when this movement is repeated many times. The result is a shortened battery life. Most of the cell phones use lithium-ion batteries, which is why the use time is reduced later.

That is, the secondary battery 114 is advantageous in that it can be reused as long as the electrochemical characteristics of the battery can be maintained by charging / discharging and charging / discharging from time to time. However, The secondary battery 114 is also exposed.

When the secondary battery 114 and the flow battery 113 are compared with each other, the life of the secondary battery 114 is shortened due to repeated charging and discharging. However, when the flow battery 113 frequently performs charging and discharging alternately The deterioration of the performance proceeds more rapidly. In addition, since the flow battery 113 converts kinetic energy transferred from a power source (such as a pump) into electrical energy through a chemical reaction, it is charged to the maximum capacity as much as possible once discharged, It is advantageous to avoid the shortening of the life time. In addition, when the flow battery 113 is discharged to the lowest capacity for the sake of operational efficiency, a so-called strip operation is performed in which the amount of charge is completely discharged to zero to remove impurities deposited on the electrode.

Although not shown in FIG. 1, the battery 140 may further include a Fly Wheel, NAS, a full solid battery, and the like. Fly Wheel converts electric energy into kinetic energy (rotational energy) by using superconductor and permanent magnet. When the permanent magnet is placed on the superconductor, the permanent magnet is magnetically levitated by the superconducting phenomenon, so that the kinetic energy can be stored permanently or semi-permanently by minimizing the friction due to the rotational motion. If you want to use the stored energy, you can connect the generator to the rotating body and convert the rotational energy back to electric energy. In this case, the name of Fly Wheel is derived from the rotating body rotating in the state of magnetic levitation, and it is a clean energy that does not discharge pollutants during electricity storage and reuse. However, since the fly wheel must be used in advance to determine whether to mechanically connect the generator to the rotating body, it is difficult to use it in an environment where charging and discharging are reversed instantaneously. It stores mainly surplus electric power as kinetic energy at midnight, It is known that it is advantageous for operation according to schedule by converting stored kinetic energy into electric energy. In order to maintain the superconducting phenomenon, it is also a feature to be considered in operation of the fly wheel that requires a high-performance cooling device known to date. In other words, it is necessary to consider the fact that a predetermined cost (cooling cost) is generated to maintain the stored energy. For example, it is assumed that the energy stored in operation is reused in a relatively short period Is required.

Another example that can be included in the battery 140 is a sodium sulfur (NAS) battery. Unlike lithium-ion batteries, which are widely used today, they are relatively cost-competitive because they use relatively cheap sodium and sulfur as raw materials. It has an energy density three times higher than that of conventional lithium-ion batteries, and has a life span of more than 15 years and is suitable for storing large energy. NAS battery is a breakthrough battery suitable for solving energy density, stability, price, and life time which was difficult to solve with Li-ion battery, but proper operating temperature is high temperature of 300 degrees Celsius, It also has operational problems.

Another example that can be included in the battery 140 is a full solid battery or a solid electrolyte battery, which is a kind of next-generation battery developed to improve the safety and energy density of an existing lithium-ion battery . It has been pointed out that there is a possibility of an explosion if an external input or shock of a special condition is applied to a liquid electrolyte as a cause of the safety of a conventional lithium-ion battery. On the other hand, it has been discovered that replacing a liquid electrolyte with a solid electrolyte improves safety, prolongs the life, enables miniaturization, and improves energy density, and thus, the research and development are accelerated. It is known that the charge and discharge efficiency and economical efficiency of current cell are still uncompleted as compared with existing lithium ion battery. Therefore, it is known that the main goal is to discover new materials of solid electrolyte and improve the economical efficiency.

As described above, in order to maintain the efficiency of the flow battery 113, the secondary battery 114, and various kinds of batteries (chargeable and dischargeable) due to differences in charging and discharging operations, Considering the special operation conditions (for example, the strip operation of the flow battery 113) and the maintenance cost of the stored energy (the cooling cost of the fly wheel), in the medium term, And establish a charging and discharging plan of the secondary battery 114 that can be charged and discharged relatively easily such as Fly Wheel, NAS, all solid batteries, etc. in the short term, It is possible to cope with the unexpected variable while changing the charging and discharging plan of the lithium-ion battery or the like in the secondary battery 114. [

Meanwhile, the EMS server 160 determines the remaining capacity of the battery 140 in step S240.

The remaining capacity of the battery 140 in step S240 can be grasped by receiving information on the remaining capacity of the battery 140 calculated by the BMS 132 of the ESS 130 by the EMS server 160. [

6. Determine if you need to charge the battery < S250 >

In step S250, it is determined whether or not the battery needs to be charged by using the remaining capacity information of the battery 140 acquired in step S240, the predicted power consumption, and the predicted production power. Also, it is possible to determine whether or not the battery 140 needs to be charged in consideration of the planned power failure information acquired from the power server 180, the power status information by time, and the like.

In a case where a battery is required to be charged, such as a planned power failure or an emergency situation, power operation can be performed according to the flowchart shown in FIG. 5. In the case where the battery is not required to be charged, Operation can be done. This will be described in more detail in step S280.

7. Calculating battery charge / discharge time < S260 >

In step S260, if it is determined in step S250 that a power failure has occurred, or if the remaining capacity of the battery does not have a capacity sufficient to prepare for an emergency, it is determined that the battery 140 needs to be charged. At this time, The time required for charge / discharge of the battery 140 is calculated in consideration of various characteristics of the battery 140 such as the battery 114.

8. Battery charge / discharge planning < S270 >

In step S270, the charge / discharge of the battery is planned so that the residual capacity of the battery is low at the time of planned power failure or emergency so that the power operation is not affected.

The battery 140 stores the energy supplied from the PCS 131 or discharges the battery 140 to supply the stored energy to the power load 120 or the power grid 150. In step S70, It is possible to establish an efficient power operation plan in the short-term, medium-term and long-term planning of the entire power operation by planning the battery charge / discharge in consideration of the charging / discharging time and the type and characteristic information of the battery 140.

9. Establishment of total power operation plan and power operation < S280 >

In step S280, using the predicted power consumption, the predicted production power, the type and characteristic information of the renewable energy generation system 110, the type of the battery 140, the characteristic information, and the remaining capacity information, To plan and manage the power operation of the power generation system.

In one embodiment, when battery charging is required during a planned power outage, the power operation can be performed according to the flowchart shown in FIG. This can be true even in the event of a planned outage, even when a battery charge is required during an emergency.

5, in step S261, the EMS server 160 calculates the power required for the planned power outage by referring to the power consumption estimated in step S210. In step S262, the required power calculated in step S261 The remaining capacity of the battery 140 detected in step S240 is compared.

If it is determined in step S262 that the required power is smaller than the remaining capacity of the battery 140 (S262-Y), the process proceeds to step S263 so that the renewable energy generated in the renewable energy generation system 110 is supplied to the power load 120 , And the EMS server 160 controls the PCS 131 of the ESS 130.

When the required electric power is smaller than the remaining capacity of the battery 140, since the required electric power during the planned power interruption is secured in the battery 140, the renewable energy generated in the renewable energy generation system 110 is supplied to the electric power load Lt; RTI ID = 0.0 &gt; 120 &lt; / RTI &gt;

On the other hand, if it is determined in step S262 that the required power is equal to or greater than the remaining capacity of the battery 140 (S262-N), the EMS server 160 calculates the required charge amount of the battery 140 in step S264.

The required charge amount refers to a charge amount that is required to be further charged in the battery 140 in order to supply power to be consumed in the power load 120 through the battery 140 during the planned power failure. The required charge amount can be calculated by subtracting the remaining capacity of the battery 140 from the necessary power.

In step S265, the EMS server 160 calculates the required production power before the planned power failure by referring to the predicted production power in step S230, and the step S266 compares the required charged amount calculated in step S264 with the calculated plan Compare the required production power before power failure.

If it is determined in step S266 that the required amount of charge is smaller than the predicted production power before the planned power failure (S266-Y), the EMS server 160 determines that the battery 140 is the renewable energy generated in the renewable energy generation system 110 Lt; RTI ID = 0.0 &gt; 131 &lt; / RTI &gt;

At this time, the battery is charged in consideration of the charging time of the battery 140. The EMS server 160 can control the PCS 131 so that the renewable energy is supplied to the power load 120 to establish a power operation plan.

If it is determined in step S226 that the required amount of charge is equal to or greater than the predicted production power before the planned power failure (S266-N), the EMS server 160 transmits the renewable energy generated in the renewable energy generation system 110 to the grid 150, The PCS 131 of the ESS 130 may be controlled so that the battery 140 is charged with the energy supplied through the battery 140. [ At this time, the battery is charged in consideration of the charging time of the battery 140. Also, it is preferable that the amount of charge due to the energy supplied from the power grid 150 is determined to be an amount obtained by subtracting the amount of charge based on the predicted production power from the 'required charge amount' to 'before the planned power failure'.

Furthermore, it is more preferable that the time to receive the energy through the power grid 150 is determined to be the time zone in which the power price is lowest with reference to the hourly power price obtained from the power server 180 in step S200 of FIG. 2 Do.

On the other hand, when the battery 140 is not required to be charged due to the planned power failure, the power operation can be performed according to the flowchart shown in FIG. 6, when the planned power failure is not scheduled, the charge / discharge schedule for the battery 140 is generated in the EMS server 160 and the power is operated using the charge / discharge schedule. The generated charge / discharge schedules are transferred from the EMS server 160 to the PCS 131 of the ESS 130.

2, the EMS server 160 refers to the power consumption predicted in step S210 of FIG. 2 and the production power predicted in step S230 of FIG. 2 based on the basic charge / discharge schedule obtained in step S200 of FIG. (140) charge / discharge schedules are generated.

Thereafter, in step S273, when the discharge time corresponding to the generated charge / discharge schedule does not arrive (S272-N), the PCS 131 supplies the renewable energy generated in the renewable energy generation system 110 to the power load 120 Or supplies it to the battery 140 for charging. The battery 140 is charged in consideration of the type, characteristic information, and charging time.

When the discharging time according to the generated charge / discharge schedule arrives (S272-Y), the PCS 131 generates the energy stored in the battery 140 and stored in the renewable energy generation system 110 And supplies the renewable energy to the power load 120. At this time, the PCS 131 supplies the energy charged in the battery 140 and the renewable energy to the power load 120, and supplies the remaining energy to the power grid 150, thereby acquiring the revenues from the surplus power sales.

7, the power management system of the present invention includes an external information acquisition unit 161, a device characteristic information acquisition unit 162, an information storage unit 163, a power prediction unit 164, A power supply unit 165, and a power operation unit 166.

The external information obtaining unit 161 obtains the power consumption demand information including the past power consumption information and the latest power consumption information from the power load 120 and receives the power consumption information from the external power server 180, And the power consumption demand information including time-based power price information, and obtains environmental information including past weather information, recent weather information, and weather forecast information from the weather server 190.

The apparatus characteristic information acquisition unit 162 acquires the type and characteristic information of the renewable energy generation system 110 and the battery 140. Also, the remaining capacity information of the battery 140 is also acquired from the BMS 132. [

The information storage unit 163 stores information acquired by the external information acquisition unit 161 and the device characteristic information acquisition unit 162. [ Further, the information storage unit 163 further acquires and stores future power consumption information and production power information predicted by the power predicting unit 164.

The power prediction unit 164 predicts future power consumption and production power using external information and device characteristic information stored in the information storage unit 163.

The power operation planning unit 165 uses the information stored in the information storage unit 163 to establish a battery charge / discharge plan and a total power operation plan.

The entire power operation plan can be planned in minutes, cities, days, and weeks, and short, medium, and long-term plans are available. You can also make plans for each season.

For example, a short-term operation plan can mean a power operation plan within one day. It is possible to predict the production power of the new and renewable energy generation system 110 in the short term (for example, within a range of one day) in consideration of the present weather conditions and the like, It is possible to determine whether to charge the battery 140 with the electric power produced in a short period of time in consideration of the capacity information. If the ratio of energy to be used for charging the battery 140 among the predicted production power of the new and renewable energy generation system 110 is determined in a short period of time, a short-term power operation plan is established to supply remaining power to the power grid 150 can do.

Also, in the case where the planned power failure information is given, the EMS server 160 can establish the short term power operation plan so that the remaining capacity of the battery 140 does not become too low considering the planned power failure information.

The medium-term operation plan can be established in consideration of the type and characteristic information of the new and renewable energy generation system 110 and the battery 140. Here, the Flow Battery (113) needs to be charged and discharged in order to maintain the first excellent performance for a long time. Accordingly, a charging and discharging plan is set up in a medium term (for example, within a range of 2-3 days, a week, etc.) in consideration of the characteristics of the Flow Battery 113, Charge and discharge plans can be established. At this time, mid-term forecasts or mid-term forecasts for the weather can be additionally planned to establish a medium-term power operation plan.

In addition, the power management plan can be established by supplementing the environmental information acquired from the weather server 190 with the demand information of the power consumption predicted in advance. For example, depending on the weather forecast in the medium-term (for example, 2-3 days or one week), it is possible to establish a new medium-term power operation plan by supplementing the mid- Or when a drought is expected, or if the heat or cold is predicted to become worse, a power operation plan can be established by correcting and supplementing the mid-term demand information of power consumption.

The long-term operation plan (for example, more than January) predicts the power consumption demand information according to the seasonal factors, and uses it for charging the battery 140 among the power generated from the renewable energy generation system 110 The average remaining capacity of the battery 140, and the like. In this case, since the long-term production power change of the renewable energy generation system 110 due to seasonal factors can also be predicted, it is possible to additionally utilize the predicted production power information in the long-term power operation planning.

The power operation unit 166 operates the power according to the power operation plan established by the power operation planning unit 165. [

The power management method according to an exemplary embodiment of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

110: Renewable energy generation system
111: Solar power generator 112: Wind power
113: Flow Battery 114: Secondary battery
120: power load
130: Energy Storage System (ESS)
131: Power Conditioning System (PCS)
132: Battery Management System (BMS)
140: Battery
150: Power grid
160: EMS (Energy Management System) server
170: Power station 180: Power server
190: weather server

Claims (12)

  1. Obtaining power consumption demand information of the power load;
    At least one of basic operating conditions for the type of the battery, a special operating mode for efficient operation, or a cost for maintaining the stored energy from a battery management system including a plurality of types of secondary batteries including a flywheel battery and a flow battery Obtaining the type and characteristic information of the battery including the battery;
    Obtaining types and characteristics information of a plurality of kinds of renewable energy generation systems including a solar power generation system and a wind power generation system;
    Obtaining environmental information from an external server; and
    Establishing an operation plan for the renewable energy generation system and the battery to correspond to the power consumption demand information in consideration of the type and characteristic information of the battery and the type and characteristic information of the renewable energy generation system;
    Lt; / RTI &gt;
    The step of establishing the operation plan
    Estimating power consumption by supplementing the power consumption demand information by using environmental information acquired from an external server, and considering characteristics of the battery including the plurality of types of secondary batteries and characteristics of each of the plurality of types of secondary batteries Selecting a battery to store energy produced in each of the plurality of types of renewable energy generation systems, and establishing the operation plan based on the predicted power consumption and the selected battery.
  2. delete
  3. delete
  4. delete
  5. The method according to claim 1,
    The step of acquiring the type and characteristic information of the battery
    The remaining capacity information of the battery is further acquired,
    The step of establishing the operation plan of the renewable energy generation system and the battery
    And the remaining capacity information of the battery is additionally taken into consideration to establish a short-term operation plan.
  6. 6. The method of claim 5,
    The step of establishing the operation plan of the renewable energy generation system and the battery
    Wherein a short-term operation plan is established by determining whether or not the battery needs to be charged using the type, characteristic information, and remaining capacity information of the battery, and calculating a required charging time or a required discharging time of the battery.
  7. The method according to claim 1,
    The step of establishing the operation plan of the renewable energy generation system and the battery
    And establishing a short-term, medium-term, or long-term plan considering the type and characteristic information of the renewable energy generation system.
  8. The method according to claim 1,
    Obtaining production power prediction information that predicts an amount of electric power generated from the renewable energy generation system in consideration of the type and characteristic information of the renewable energy generation system using the environmental information;
    Further comprising:
    The step of establishing the operation plan of the renewable energy generation system and the battery
    And the operation plan is established by further considering the obtained production power prediction information.
  9. The power consumption demand information including the past power consumption information and the latest power consumption information from the external power load and obtains the power consumption demand information including the power situation information, An external information acquiring unit acquiring environmental information including past weather information, recent weather information, and weather forecast information from an external weather server;
    A device for acquiring the type and characteristics information of a battery including a plurality of kinds of renewable energy generation systems including a photovoltaic power generation system and a wind power generation system, and a plurality of kinds of secondary batteries including a flywheel battery and a flow battery An information obtaining unit;
    An information storage unit for storing information obtained by the external information obtaining unit and the device characteristic information obtaining unit;
    A power predicting unit for predicting power consumption and production power using information of the information storage unit;
    A power operation planning unit for establishing a power operation plan using information stored in the information storage unit; And
    A power operating unit for operating power according to an operation plan of the power operation planning unit;
    Lt; / RTI &gt;
    The power predictor predicts the power consumption by supplementing the power consumption demand information using the acquired environment information,
    Wherein the power operation planning unit selects a battery for storing energy produced in the renewable energy generation system in consideration of the type and characteristic information of the battery and establishes the power operation plan based on the predicted power consumption and the selected battery Power management system.
  10. delete
  11. 10. The method of claim 9,
    The apparatus characteristic information obtaining unit
    The remaining capacity information of the battery is additionally acquired from the battery management system (BMS) of the energy storage device (ESS) in addition to the type and characteristic information of the battery,
    The power operation planning unit
    And the power management plan is established by further considering remaining capacity information of the battery.
  12. 10. The method of claim 9,
    The information storage unit
    The power consumption information and the production power information predicted by the power prediction unit are additionally acquired and stored,
    The power operation planning unit
    And the power operation plan is established by further considering the predicted power consumption and production power information.
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