KR20180012049A - Hybrid Energy Storage System and Power Management method thereof - Google Patents

Abstract

A hybrid energy storage system (HESS) according to the present invention includes: a generator which generates generation power using an internal engine when electric power consumption higher than the sum of stored power of a storage battery and power of KEPCO is required; the storage battery which is charged with the electric power from the KEPCO at a specific time zone or a time zone with a low power demand and supplies the stored power to a load if the power consumption of the load is high; and a control unit for controlling a ratio of the electric power from the KEPCO, the generation power, the stored power and providing load power whose ratio is controlled to the load. The HESS according to the present invention can stably supply the power by properly using a plurality of power source units according to instantaneous maximum electric power consumption at home.

Description

[0001] The present invention relates to a hybrid power storage system and a power management method thereof,

The present invention relates to a hybrid power storage system and a power operation method thereof.

The energy storage system was used for station equipment and industrial facilities for emergency power supply. However, in the case of the electric power storage system utilized in such existing broadcasting equipment and industrial facilities, only the internal generator was used in addition to the KEPCO power source.

In addition, although such a power storage system is utilized for a hybrid vehicle, it is difficult to find an example in which the power storage system is used in a domestic power system or a household appliance. In this regard, existing power storage systems only use the generator from the emergency power source when the KEPCO power source is not available. In other words, there is a problem that the power storage system and its power management method for minimizing power consumption while mitigating instantaneous maximum power consumption are not presented at all, rather than being utilized as an emergency power source, in order to use the power system or home appliance.

Therefore, there has been a problem in that there is no consideration of a method of charging a charger (capacitor) and utilizing such stored electric power in a specific situation in addition to the internal generator.

The present invention is devised in accordance with the above-described technical background and aims at supplying power stably by suitably utilizing a plurality of power units in accordance with the instantaneous maximum power consumption.

The present invention also aims to charge the KEPCO power in a specific situation, to use the KEPCO power under certain conditions, or to use the KEPCO power and the generated power in parallel, and to provide an optimized ratio thereof.

A hybrid electric energy storage system (HESS) according to the present invention is a hybrid electric energy storage system (HESS) that generates electric power using an internal engine when power consumption higher than the sum of electric power of the electric power and electric power of a battery is required. A battery which charges electric power from the electric power source at a specific time zone or at a time when electric power demand is low and supplies the electric power to the load when the power consumption of the load is high; And a control unit for adjusting the ratio of the electric power generated by the electric power generating unit, the electric power generated by the electric power generating unit, and the electric power stored in the electric power unit to provide the load electric power whose ratio is adjusted to the load. So that power can be supplied stably.

According to an embodiment, when the power consumption exceeds the first reference value, the controller may operate in a cold-storage mode in which the cold storage power and the storage power are supplied in parallel at a first predetermined ratio.

According to one embodiment, the control unit predicts whether or not the power consumption exceeds a second reference value corresponding to the sum of the electric power and the electric power, and, based on the prediction, Power generation mode in which the power is supplied in parallel at a predetermined second rate.

According to an embodiment, the control unit may supply the electric power generation and the electric power generation in parallel at a third rate different from the second rate on the basis of the electric power cost of the electric power of the electric power generation at the current time and the generation cost of the electric power generation .

According to an embodiment, the control unit operates in a KEPCO-power generation-charging mode in which the KEPCO, the storage power and the generated power are both supplied to the load until the power supply by the generated power is stabilized, Power mode in which the generated power and the stored power are supplied in an emergency situation in which the power supply is not supplied.

According to one embodiment, the control unit synchronizes the voltage, current, waveform, and frequency of the corresponding power line in accordance with the operation mode among the electric power, the generated electric power, and the stored electric power, , Generating a generated power or a stored power having the same voltage, waveform and frequency as the waveform and the frequency, and the generated power or the stored power can be determined based on any one of the first to third ratios.

According to another aspect of the present invention, there is provided a method of operating a power in a hybrid power storage system, comprising: charging a power from a korean power supply during a specific time period or at a time when power demand is low; A storage power supply step of supplying storage power of the storage battery to the load when the power consumption of the load is high; A generation power generation step of generating power generation power using an internal engine when a power consumption greater than a sum of the kWon power and the accumulation power of the battery is required; And a power ratio adjustment and power supply step of adjusting the ratio of the electric power generation, the generation electric power and the power storage power to provide the load electric power with the ratio adjusted to the load.

According to an embodiment, the power ratio adjustment and the power providing step may include synchronizing a voltage, a current, a waveform, and a frequency of a corresponding power line according to an operation mode among the electric power, the generated electric power and the stored electric power; And providing the electric power and the electric power in parallel at a predetermined first rate when the electric power consumption exceeds a first reference value, wherein the synchronization includes a voltage, a waveform and a waveform of the electric power of the electric power, The generated power or the stored power having the same voltage, waveform and frequency as the frequency, and the current of the generated power or the stored power can be determined based on any one of the first to third ratios.

According to an embodiment, the power ratio adjustment and the power providing step may include: predicting whether the power consumption exceeds a second reference value corresponding to a sum of the electric power and the power storage, And a step of providing the KEPCO power and the generated power in parallel at a predetermined second ratio.

According to an embodiment of the present invention, before the electric power supply by the electric power generation is stabilized before the electric power generating electric power providing step, electric power of electric power of KEPCO - electric power generation - Further comprising the step of providing a power generation-storage provision step of supplying the generated power and the stored power in an emergency situation in which the uninterruptible power is not supplied after the step of providing the uninterruptible power supply.

As described above, the hybrid power storage system and its power operation method according to the present invention are capable of stably providing the load power whose ratio is adjusted to the load by adjusting the ratio of the electric power generation, .

Further, according to the present invention, power consumption is compared with a plurality of reference values to provide power in different modes, and an optimized power ratio for minimizing an electricity fee based on the generation cost of the electric power and the electric power cost of the electric power It has the advantage that it can provide.

FIG. 1 shows a detailed configuration of a hybrid power storage system (HESS) according to the present invention.
2 shows a configuration of a power operating system using an automatic transfer switch (ATS) and an uninterruptible power supply (UPS) in connection with the present invention.
3 shows a flow chart of a power operation method in a hybrid power storage system according to the present invention.
4 shows a flow chart of the detailed procedure for the power ratio adjustment and power supply step in the power operation method.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, It will be possible. While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and are herein described in detail. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for similar elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Should not.

The suffix "module "," block ", and "part" for components used in the following description are given or mixed in consideration of ease of specification only and do not have their own distinct meanings or roles .

The present invention relates to a hybrid power storage system and a method of operating power in a hybrid power storage system.

FIG. 1 shows a detailed configuration of a hybrid power storage system (HESS) according to the present invention. In this regard, the hybrid power storage system may be referred to as a power storage system, a power handling device, or a hybrid power handling device.

Referring to FIG. 1, the hybrid power storage system 1000 includes a generator 100, a battery 200, and a controller 300. Meanwhile, the generator 100 may include an engine 110 and a generator 120. In this regard, the engine 110 may include an engine, a gas turbine, a steam turbine, and the like, each of which uses a solid refuse fuel (SRF) in addition to an engine that generally generates power. Meanwhile, in connection with the SRF, the SRF includes a method using a dedicated combustion technology for renewable energy (SRF, BIO-SRF). Therefore, it is possible to cope with the rapidly changing post-combustion system by using the combustion technology for exclusive use of renewable energy which can be recognized as such a green technology.

The engine 110 is started by a control signal transmitted through the generator 120 to generate power. The engine 110 transmits the generated power to the generator 120. The generator 120 starts the engine 110 and receives power from the engine 110 to generate electric power. Here, the generated power may be referred to as generated power.

That is, the generator 100 generates electric power using an internal engine when power consumption higher than the sum of the electric power of the electric power and the electric power of the battery is required. In this regard, the KEPCO power and the battery power may be referred to as KEPCO line power and battery power, respectively.

As described above, the internal engine may include not only an engine that generally generates power but also an engine using a solid fuel (SRF: Solid Refuse Fuel), a gas turbine, a steam turbine, etc., It also includes engines using auxiliary power.

On the other hand, the battery 200 charges electric power from the electric power source at a specific time period or at a time when power demand is low. Further, the storage battery 200 supplies the storage power to the load when the power consumption of the load is high. Here, the battery 200 may be referred to as a capacitor, a rechargeable battery, a charger, or the like.

On the other hand, the controller 300 adjusts the ratio of the electric power, the generated electric power and the stored electric power to provide the load electric power whose ratio is adjusted to the load. Here, the controller 300 may be referred to as an inverter controller.

Meanwhile, the controller 300 may operate in various modes through comparison with the power consumption of a load according to a plurality of household appliances in the house. In this regard, when the power consumption of the load is equal to or less than the first reference value, the controller 300 operates in the KOP mode using only the KOP.

Meanwhile, when the power consumption exceeds the first reference value, the controller 300 may operate in a cold-storage mode in which the cold storage power and the storage power are supplied in parallel at a first predetermined ratio. With respect to the storage power, an internal battery can be used, but considering how to charge the battery, it is as follows. That is, the control unit 300 can charge the battery 200 with electric power at a time when power demand such as midnight power is low and the power supply unit price is low. On the other hand, it is possible to refer to the KEPCO-KEEP mode in which the KEPCO power and the KEPCO power are supplied in parallel at a predetermined first ratio. In the KEON-KAIST mode, when the power consumption (used power) is large, the storage power is operated by the ESS concept. In order to prevent the consumption of the storage power, Generate output. At this time, it is possible to output the KEPCO power and the power storage ratio as a percentage (%).

Next, the control unit 300 may predict (determine) whether or not the power consumption exceeds a second reference value corresponding to a sum of the electric power and the electric power. Meanwhile, the second reference value can be determined not only by the sum of the upper limit of the electric power and the upper limit of the electric power, but also by considering the margin values in the upper limit values. In addition, it may be determined as a predetermined value irrespective of these, or may be determined in consideration of the power supply unit price, the power generation unit price in the generator, and the charging unit price in the capacitor.

Also, the control unit 300 may operate in the KEPD mode in which the KEPT and the generated power are supplied in parallel at a predetermined second rate based on the prediction. In this regard, the generator (power) operates the generator 100 to generate and output the generated power when the electric power supplied by the electric power and the electric power is insufficient.

Meanwhile, the controller 300 may supply the electric power and the generated electric power in parallel at a third rate different from the second rate based on the electric power cost of the electric power of the electric power and the generation cost of the electric power at the current time, - Can operate in power generation mode.

In addition, when the electric power of the electric power is temporarily and completely unavailable, the controller 300 may operate in the electric power-storage mode in which the electric power and the generated electric power are supplied in parallel when the electric power is insufficient only by the electric power before the electric power is supplied.

In addition, the control unit 300 compares the sum of the stored electric power and the stored electric power with the electric power (peak electric power), and operates the electric power generator and the generator 100 in parallel and outputs them proportionally . At this time, the generator 100 generates / provides a power corresponding to a value obtained by subtracting the power value of the electric power from the power consumption (the peak electric power of the electric power). Meanwhile, until the generator 100 generates electric power and provides stable electric power to the load, it can operate in the electric-power generation mode in which the electric power, the storage electric power, and the generated electric power are all supplied to the load.

Meanwhile, when the generators are operated in parallel in addition to the KEPCO power, it is preferable that the KEPCO-power generation-power generation mode outputs ratio based on power generation power in order to prevent a large amount of power from being consumed. That is, in the case where stable power supply from the generator 100 is possible, the electric-power generation-power generation mode operates in the electric power generation mode.

Meanwhile, the controller 300 must synchronize the power parameters for the parallel output according to the complex mode such as the above-described electric-power storage mode, electric-electric-power generation mode, electric-power-storage mode, electric power- . That is, the controller 300 synchronizes the voltage, current, waveform, and frequency of the corresponding electric power line according to the operation mode among the electric power, the generated electric power, and the stored electric power. For example, when the above-mentioned KEPCO power uses a sinusoidal wave of a 220V AC voltage of 60Hz, the generated power and the power of the battery are synchronized with each other such that the voltage, waveform and frequency are provided in the form of a sine wave of a 220V AC voltage of 60Hz. Further, with respect to the current, the load is provided to the load at a current value determined in consideration of the ratio between power according to the operation mode without exceeding the maximum allowable current. That is, the synchronization generates power generation electric power or electric power having the same voltage, waveform and frequency as the voltage, waveform and frequency of the electric power of the electric power, and the electric power of the electric power generation or the electric power storage is generated in the first to third ratio Can be determined based on either one. On the other hand, the KEPCO power and the generated power are alternating current (AC), but since the storage power is a direct current (DC), the battery is provided with an IGBT (Insulated Gate Bipolar Transistor) can do. On the other hand, the KEPCO power, the generated power and the battery power can all be supplied directly to the load by AC power, so that there is an advantage that no separate DC-AC converter or frequency converter is additionally required.

Meanwhile, FIG. 2 shows a configuration of a power operation system using an automatic transfer switch (ATS) and an uninterruptible power supply (UPS) in connection with the present invention. The power handling system 2000 includes an automatic transfer switch (ATS) 2100 and an uninterruptible power supply (UPS) 2200. The automatic transfer switch 2100 is provided to selectively output the keon power or the keon power and the generated power. The uninterruptible power supply (UPS) 2200 stores power selectively output from the automatic transfer switch 2100. That is, the uninterruptible power supply 2200 stores the electric power from the electric power or the electric power generated from the electric power and generated electric power under a specific condition. That is, a case where a larger amount of electric power than the amount of electric power consumed by the load is supplied, and the electric power of the electric power corresponds to a midnight time when the electric power supply unit price is low.

Table 1 compares the characteristics of the power operation method according to the ATS, UPS, ESS and HESS schemes in connection with the present invention. The hybrid power storage system of FIG. 1 according to the present invention corresponds to HESS. Meanwhile, in connection with the present invention, the method shown in FIG. 2 corresponds to ATS and UPS. That is, the hybrid power storage system shown in FIG. 1 has an advantage that it can be utilized both in the selection output of the KEPCO power and the power other than the KEPCO power, storage storage, parallel operation, peak power supplement, and program operation. That is, the power operation method and system according to the HESS scheme includes all the ATS, UPS, and ESS, and it is possible to complement the advantage of parallel operation, supplement the peak power, and operate the program. Also, the power operation method and system according to the HESS method can maximize the stability of power with the use of a nickel-metal hydride battery.

ATS UPS ESS HESS Selective output O O O O Storage X O O O Parallel operation X X X O Supplementing Peak Power X X X O Program Operation X X O O

So far, we have studied the hybrid power storage system in detail. Hereinafter, a method of operating a power in a hybrid power storage system will be described with reference to the present invention. Meanwhile, the above-mentioned contents in the hybrid power storage system can be utilized in the power operation method in the hybrid power storage system.

In this regard, Fig. 3 shows a flow chart of a power operation method in a hybrid power storage system according to the present invention.

Referring to FIG. 3, the power operation method includes a power charging step S300, a power storage power supply step S400, a generating power generating step S500, and a power ratio adjusting and power providing step S600.

The power charging step (S300) charges the electric power from the electric power in a specific time zone or a time period when the electric power demand is low.

The power storage power supply step (S400) supplies the storage power of the storage battery to the load when the power consumption of the load is high.

The generated power generation step S500 generates generated power using an internal engine when power consumption higher than the sum of the electric power of the electric power and the accumulative electric power of the battery is required.

The power ratio adjustment and power supply step (S600) adjusts the ratio of the electric power, the generated electric power and the electric power to provide the load electric power with the ratio adjusted to the load.

On the other hand, Fig. 4 shows a flow chart of detailed procedures for power ratio adjustment and power supply step in the power operation method.

Referring to FIG. 4, the power ratio adjustment and power supply step S600 includes the steps of providing a KEPCO power S610, a power line synchronization step S620, a KEPCO-charging power providing step S630, a KEPCO- (S640), a KEPCO-generating power providing step (S650), and a generating-charging power providing step (S660). In this regard, it goes without saying that the power providing steps may be a providing step according to an embodiment, and the providing steps may be arranged in different orders or various combinations.

In the step S610, the electric power is supplied only by the electric power when electric power can be supplied to the load including domestic appliances by the electric power.

The power line synchronization step S620 synchronizes the voltage, current, waveform, and frequency of the power line according to the operation mode among the electric power, the generated electric power, and the electric power. The synchronization generates the generated power or the stored power having the same voltage, waveform and frequency as the voltage, waveform, and frequency of the uninterruptible power, and the generated electric power or the electric power of the stored electric power is stored in the first to third ratio Is determined based on either one. For this, as shown in FIG. 4, a process of determining whether the power consumption exceeds the first reference value or whether the power consumption exceeds the second reference value may be preceded. Meanwhile, the power line synchronization step S620 may be performed in each mode conversion step of FIG.

When the power consumption exceeds the first reference value, the electric power-storage power providing step (S630) supplies the electric power and the electric power in parallel at a predetermined first rate. At this time, if the power consumption does not exceed the first reference value, the step S610 is performed.

In the meantime, the KEPG-generating power providing step (S650) may predict whether or not the power consumption exceeds a second reference value corresponding to the sum of the keon power and the storage power, and, based on the prediction, And the generated power is supplied in parallel at a second predetermined rate. In the meantime, before the electric power supply by the generated electric power is stabilized before the electric power-generating electric power providing step (S650), the electric power supplied to the electric power-generating- (S640) may be performed. In step S640, the control unit determines whether the power from the generated power is stabilized. If the power is stabilized, the control unit deactivates the power save mode to provide the generated keon power generation power (S650) It is possible to proceed.

The power generation-storage power providing step (S660) is a step of supplying the generated power and the stored power in an emergency situation in which the uninterruptible power is not supplied. At this time, since it is difficult to accurately predict the power consumption, it is possible to supply both the generated power and the stored power, and supply only one of the generated power and the stored power as needed.

According to at least one of the above-described embodiments of the present invention, there is an advantage that the ratio of the KEPCO power, the generated power, and the power storage can be adjusted to stably provide the load power whose ratio is adjusted to the load.

According to at least one of the embodiments of the present invention, the power consumption is compared with a plurality of reference values to provide power in different modes, and the electricity cost is minimized based on the electric power cost of the electric power and the generation cost of the electric power generated It is possible to provide an optimized power ratio for the power consumption.

According to a software implementation, not only the procedures and functions described herein, but also each component may be implemented as a separate software module. Each of the software modules may perform one or more of the functions and operations described herein. Software code can be implemented in a software application written in a suitable programming language. The software code is stored in a memory and can be executed by a controller or a processor.

100, 120: generator 110: engine
200: storage battery 300: control unit
1000: Hybrid Power Storage System
2000: Power management system
2100: Automatic Transfer Switch 2200: Uninterruptible Power Supply

Claims (10)

In a hybrid power storage system (HESS: Hybrid Energy Storage System)
A generator for generating electric power using an internal engine when power consumption higher than the sum of electric power generated by the electric power generator and the battery is required;
A battery which charges electric power from the electric power source at a specific time zone or at a time when electric power demand is low and supplies the electric power to the load when the power consumption of the load is high; And
And a controller for adjusting the ratio of the electric power, the generated electric power and the electric power to provide the load electric power whose ratio is adjusted to the load. The method according to claim 1,
Wherein,
Power mode in which the electric power for the electric power generation and the electric power for storage are supplied in parallel at a predetermined first ratio when the power consumption exceeds the first reference value. 3. The method of claim 2,
Wherein,
Estimating whether or not the power consumption exceeds a second reference value corresponding to a sum of the keon power and the storage power and supplying the keon power and the generated power in parallel at a predetermined second ratio based on the prediction A hybrid power storage system operating in KEPCO-power generation mode. The method of claim 3,
Wherein,
Power mode in which the electric power of the electric power of the electric power of the electric power at the current time and the generation cost of the electric power generation are supplied in parallel at a third rate different from the second rate, Power storage system. 3. The method of claim 2,
Wherein,
Power generation-power-saving mode in which all the electric power, electric power and generated electric power are supplied to the load until the electric power supply by the generated electric power is stabilized,
And operates in a power-saving mode for supplying generated power and stored power in an emergency situation in which the uninterruptible power is not supplied. 5. The method of claim 4,
Wherein,
The voltage, the current, the waveform, and the frequency of the corresponding electric power line are synchronized according to the operation mode among the electric power, the generated electric power and the electric power,
Wherein the synchronization generates generated power or stored power having the same voltage, waveform, and frequency as the voltage, waveform, and frequency of the uninterruptible power,
And the current of the generated power or the stored power is determined based on any one of the first to third ratios. A method of operating a power in a hybrid power storage system,
A power charging step of charging electric power from the korean electric power at a specific time zone or at a time when power demand is low;
A storage power supply step of supplying storage power of the storage battery to the load when the power consumption of the load is high;
A generation power generation step of generating power generation power using an internal engine when a power consumption greater than a sum of the kWon power and the accumulation power of the battery is required; And
And adjusting the ratio of said electric power, said generated electric power and said stored electric power to provide said rated load electric power to said load. 8. The method of claim 7,
Wherein the power ratio adjustment and power providing step comprises:
A synchronization step of synchronizing a voltage, a current, a waveform and a frequency of a corresponding electric power line according to an operation mode among the electric power, the generated electric power and the electric power; And
And providing the electric power and the electric power in parallel at a predetermined first ratio when the electric power consumption exceeds a first reference value,
Wherein the synchronization generates generated power or stored power having the same voltage, waveform, and frequency as the voltage, waveform, and frequency of the uninterruptible power,
Wherein the generated electric power or electric current of the stored electric power is determined based on any one of the first to third ratios. 9. The method of claim 8,
Wherein the power ratio adjustment and power providing step comprises:
Estimating whether or not the power consumption exceeds a second reference value corresponding to a sum of the keon power and the storage power and supplying the keon power and the generated power in parallel at a predetermined second ratio based on the prediction Further comprising a KEPCO-generated power providing step. 10. The method of claim 9,
Before the KEPCO power generation step,
The method of claim 1, further comprising the step of providing a KEPCO-power generation-power storage power supply to the load before the power supply by the generated power is stabilized,
After the KEPCO generation power providing step,
Further comprising the step of providing power generation and power storage for supplying the generated power and the stored power in an emergency situation in which said uninterruptible power is not supplied.

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