KR20190080176A - Cng charging station with trigeneration system and operating method of that - Google Patents

Abstract

Disclosed are a CNG charging station applied with trigeneration, and an operating method thereof. According to the present invention, the CNG charging station comprises: a main power supply unit having a system power introduced thereto from a power network of a Korean electric power corporation, and supplying a main power to a CNG charging station; and a trigeneration system for integrally producing power and cooling/heating energy using natural gas as fuel, and supplying an auxiliary power to the CNG charging station. According to the present invention, power and cooling/heating energy produced by the trigeneration system are supplied to a charging station management facility, thereby providing a service combined with the charging station management facility.

Description

TECHNICAL FIELD [0001] The present invention relates to a CNG charging station and a CNG charging station,

The present invention relates to a method of operating a CNG charging station and a CNG charging station, and more particularly, to a method of operating a CNG charging station and a CNG charging station using a triple power generation system and an energy storage system (ESS) And a method of operating a CNG charging station and a CNG charging station that provides a CNG charging service in combination with a charging station management facility utilizing cooling and heating energy.

Recently, the improvement of air quality in metropolitan cities including fine dusts and the decontamination policy have been included in the projects of the 100th national government. As a detailed implementation plan for the supply of CNG (Compressed Natural Gas) charging stations will be promoted, the supply of CNG charging stations will expand in the future It is expected.

1 is a graph showing a daily power use pattern of a conventional CNG charging station.

Referring to FIG. 1, it can be seen that the daily power consumption of a conventional CNG refueling station changes very rapidly with time, which is inevitable due to the operation of a natural gas compressor, which is a core facility of the CNG refueling station.

The CNG charging station is a facility that charges CNG in various portable tanks including vehicles using natural gas as fuel. It has a large number of high-load natural gas compressors for transport and storage of CNG. The high load device suddenly increases the maximum power peak value in accordance with the operation characteristics due to the power characteristics, and the power consumption exceeds the contract power set as the power supply amount of the supply system, which causes the cost to rise.

Therefore, the existing CNG charging station is required to manage the electric power efficiently because the electric power charge is estimated to be high due to the excessive starting power and the usage amount caused by the characteristics of the high load device. Also, considering the fact that the basic charge is applied according to the maximum demand power, the peak power management in the CNG charging station in which the usage pattern changes suddenly is a very important problem.

As one of the measures for suppressing the peak power of the CNG charging station, it may be considered to manage the peak power and the load by introducing an energy storage system (hereinafter referred to as 'ESS') into the charging station, Since the initial investment is very high and the battery efficiency of ESS decreases rapidly over time, there are many difficulties in practical application.

The present invention relates to a method for managing a peak load of a CNG charging station in which power supplied to a CNG charging station is selectively supplied from at least one of a KEPCO power system and a triple power generation system to thereby suppress a maximum power consumption, And respond flexibly to sudden fluctuations in demand for electricity.

In addition, the present invention provides a CNG charging station in which a charging station management facility is combined using cooling / heating energy produced by a triple power generation system, thereby providing a convenient and convenient access to a CNG charging service.

The present invention aims at enabling the stable operation of the CNG charging station, reducing the initial investment cost of the CNG charging station and the electric power charge, and ultimately contributing to the popularization of the CNG charging station.

In order to accomplish the above object, the present invention provides a CNG charging station for providing a service in a form associated with a charging station management facility, comprising: a main power supply unit for supplying system power to the CNG charging station, ; And a triple power generation system for integrally producing electric power and cooling / heating energy by using natural gas as a fuel and supplying auxiliary power to the CNG charging station, wherein the power and the cooling / heating energy produced by the triple power generation system And supplies the CNG refueling station to the management facility of the refueling station.

The CNG charging station according to the present invention further includes an ESS (Energy Storage System) for receiving and storing power from the main power supply unit or the triple power generation system, and the power supplied to the CNG charging station is supplied to the main power supply unit, The triple power generation system, and the ESS.

The triple power generation system can use natural gas handled by the CNG charging station as fuel.

The charging station management facility may include at least one of an office room, a shower room, a car wash facility, and a control room as a facility that requires heating and cooling.

The triple power generation system includes: a gas engine that supplies natural gas and burns it and converts the natural gas into rotary power; A generator detachably connected to the gas engine by a first power control unit to selectively generate power; A cooling / heating device detachably connected to the gas engine by a second power control unit to perform cooling or heating; An arrangement recovery device for recovering heat of exhaust gas of the gas engine; And an arrangement utilizing device for converting the energy of the gas engine into energy using the arrangement recovered by the arrangement recovery device, wherein the power generated by the gas engine is fluidly converted to energy of at least one of electric power energy, cooling energy and heating energy .

In order to achieve the above object, the present invention provides a method of operating a CNG charging station including a triple power generation system, wherein the CNG charging station includes a triple power generation system capable of simultaneously generating power and cooling / heating energy, And an ESS (Energy Storage System) for receiving and storing power supplied from the triple power generation system or an electric power generated from the triple power generation system, wherein the power required for the CNG charging station is supplied to at least one of the KEPCO power grid, The CNG refueling station including a triple power generation system.

The CNG charging station provides a service in a form combined with a charging station management facility and supplies the cooling / heating energy produced by the triple power generation system to the charging station management facility.

The triple power generation system can operate at the operating time of the charging station management facility to produce power and cooling / heating energy.

In addition, according to the present invention, electric power supplied through the electric power generating network is stored in the ESS during a light load period with a low electric power charge, electric power supplied through the electric power electric power network during a peak load time period, And the power stored in the ESS may be selectively supplied to the CNG charging station.

The triple power generation system provided in the CNG charging station according to the present invention can be easily installed in a building unit without the need of constructing a new transmission and distribution system so that a space for installation of the CNG charging station can be easily secured in the city center.

The CNG charging station according to the present invention can selectively supply power supplied to the charging station from at least one of the main power supply unit and the triple power generation system so that the CNG charging station can be flexibly supplied to the CNG charging station, Accordingly, the CNG charging station can be operated stably, and the maximum electric power consumption can be suppressed to reduce the electric power charge.

Further, the present invention can drastically reduce the initial investment cost of the CNG charging station by introducing the triple power generation system, and can provide the CNG charging service combined with the charging station management facility using the cooling and heating energy produced by the triple power generation system .

On the other hand, even if the effects are not explicitly mentioned here, the effects described in the following specification, which are expected by the technical features of the present invention, and the provisional effects thereof are handled as described in the specification.

1 is a view showing a pattern of daily power consumption of a conventional CNG charging station.
2 is a schematic view of a CNG charging station according to the present invention.
3 is a graph showing power consumption of a CNG charging station according to the present invention.
4 is a schematic view of a triple power generation system applied to the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

2 is a schematic view of a CNG charging station according to the present invention.

Referring to FIG. 2, the CNG charging station according to the present invention includes a natural gas compressor 100, a main power supply 200, a triple power generation system 300, and an ESS 500.

The natural gas compressor 100 is a device for compressing natural gas to produce CNG. The CNG charging station can receive power from the main power supply unit 200 through which the system power is supplied from the KEPCO power plant. At this time, due to the characteristics of the natural gas compressor 100, which is a high load device, There may be serious problems in stability such as load concentration.

In order to solve the serious load concentration problem of such a power system, the present invention further includes a triple power generation system 300 as an auxiliary power source of the CNG charging station.

The triple power generation system 300 is a type of cogeneration system that uses natural gas as a fuel and is capable of power generation, cooling, and heating. The triple power generation system 300 of the present embodiment is a heat pump type that generates electric power by driving the generator with the power produced by burning natural gas in the gas engine. The heat of the exhaust gas discharged after the combustion and the arrangement of the engine cooling water are recovered So that it can be used for heating and cooling.

The triple power generation system 300 is one of the distributed power generation systems, and can be easily installed for each CNG charging station without having to construct a new transmission and distribution system, and can supply power generated by itself to the CNG charging station as auxiliary power.

The CNG charging station according to the present invention can selectively receive power supplied to the CNG charging station from at least one of the main power supply unit 200 and the triple power generation system 300, It is possible to flexibly cope with sudden fluctuations in electric power demand caused by the power consumption of the CNG charging station, thereby enabling stable operation of the CNG charging station and reducing power consumption by suppressing the maximum electric power consumption.

The CNG charging station according to the present invention further includes an ESS 500 for storing electric power supplied from the main electric power supplying unit 200 (electric power supplied through the electric power generating electric power network) or electric power produced by the triple electric power generating system 300 can do.

The ESS 500 can store the power supplied from the main power supply unit 200 or the triple power generation system 300 and freely use it in a required time zone.

Therefore, the CNG charging station according to the present invention can supply power from the ESS 500 to the CNG charging station as well as the main power supply unit 200 and the triple power generation system 300, and can selectively control the power supply source Therefore, the peak load can be more efficiently managed.

Stabilization of power supply and demand is the most important issue in terms of energy demand management. If the prior art focuses on managing power demand by analyzing a demand pattern of a consumer in order to suppress a peak load of a charging station, It is to suppress the peak load by the non-supply management.

When the triple power generation system 300 and the ESS 500 are used together, it is preferable that the ESS 500 is installed at a minimum unit scale and used together with the triple power generation system 300.

When the three-way power generation system 300 and the ESS 500 are used together, the ESS 500 installed in the CNG charging station can be operated by the triple power generation system 300 whose installation cost is much lower than that of the ESS 500 on the basis of the same capacity Since the storage capacity can be changed to a smaller one, the initial investment cost of the CNG charging station can be reduced.

That is, by replacing a part of the ESS 500 installed in the CNG charging station with an inexpensive triple power generation system 300, a power supply system of a CNG charging station that can achieve the same or more effects at a lower installation cost than the existing one .

For example, assuming that the maximum power peak time of the CNG charging station is 4 hours, the installation cost of the ESS 500 based on 200 kWh is estimated to be about 300 million KRW. Even if the triple power generation system 300 is installed with a capacity of 50 kWh, It is necessary to produce 200 kWh of electricity, so that installation cost of about 40 million won is expected. In addition, since the battery of the ESS 500 deteriorates efficiency over time, the triple power generation system 300 needs to be replaced, but the system itself is not required to be replaced unless there is a special reason, .

The operator of the CNG charging station can set the installation size of the triple power generation system 300 and the ESS 500 considering the low installation cost of the triple power generation system 300 and the discount rate of the electricity rate by using the ESS 500 will be.

Meanwhile, the CNG charging station according to the present invention can be provided in the form of a service combined with the charging station management facility 400. The power and cooling / heating energy required in the charging station management facility 400 are provided from the tritium generation system 300 Can receive.

Herein, the refueling station management facility 400 is a facility that is operated in combination with a refueling station, such as an office room, a shower room, a car wash facility, and a control room of a CNG refueling station. However, the present invention is not limited to this, and any type of facility can be applied if it is a facility that provides convenience to a charging station user or operator and has a demand for heating and cooling.

The present invention provides electricity and cooling / heating energy required by the charging station management facility (400) using the triple power generation system (300) capable of integrally producing power and cooling / heating energy sources, It is not necessary to provide an air-conditioning heat source.

As described above, in the present invention, it is essential to introduce the triple power generation system 300 as a distributed power source to the CNG charging station to manage the peak power. Using the triple power generation system 300 has the following advantages have.

First, the triple power generation system 300 can be easily installed in a building unit without the need of constructing a new transmission and distribution system, so that a space for installing the CNG charging station can be easily secured in the city center.

In addition, the introduction of the triple power generation system 300 can reduce the installation number of the ESS 500 or reduce the capacity, so that the initial investment cost of the CNG charging station can be drastically reduced, The CNG recharging service combined with the refueling station management facility 400 can be provided using the cooling / heating energy.

In addition, due to the nature of the CNG charging station that handles the gaseous fuel, the fuel can be easily supplied to the triple power generation system 300 using natural gas as the fuel, so there is no burden on the fuel supply and the operation can be facilitated to contribute to the supply of the CNG charging station. .

Continuing to refer to FIG. 2, a method of operating a CNG charging station according to the present invention will be described.

As described above, in the present embodiment, the CNG charging station includes a main electric power supplied through the main electric power supply unit 200; Power generated in the triple power generation system 300; And power stored in the ESS 500; Or the like.

Also, the CNG charging station according to the present invention can selectively use one or more of the main power supply unit 200, the triple power generation system 300, and the ESS 500 by time zone, thereby managing the peak load and the power demand.

For example, at the operating time of the charging station management facility 400 where the cooling / heating energy demand occurs, the power can be generated using the power generation system 300, so that the power generation network 300 and the power generation system 300 can be utilized The CNG charging station can be powered.

In addition, in the 'light load time zone' in which the electric power charge is low, electric power supplied through the electric power grid is stored in the ESS 500, and electric power supplied through the electric power grid in the 'maximum load time zone' It is possible to selectively use the electric power produced in the ESS 300 and the electric power stored in the ESS 500.

FIG. 3 is a graph showing power consumption of the CNG charging station according to the embodiment. FIG. 3 shows a case where a power grid is supplied by a KEPCO power network, and B is a case where power is supplied from a KEPCO power grid and a triple power generation system , And C represents the case where power is supplied from the KEPCO power grid, the triple power generation system, and the ESS, respectively.

Referring to FIG. 3, the graph B shows the power consumption of the KEPCO power grid when the triple power generation system 300 is operated at the operating time (about 6 to 20 hours) of the charging station management facility 400 as in the above embodiment, The power generated by the three-phase power generation system 300 is reduced.

In the case of the C graph, the electric power consumption is slightly increased because electric power is charged to the ESS 500 through the electric power network at the light load time (about 2 to 5 hours), and at the maximum load time (about 12 to 15 hours) It can be seen that the use of the ESS 500 reduces the corresponding amount of power consumption.

Light load and peak load is a term used to set industrial electric power charges, which refers to load types that divide power usage time by day. The light load time is the time of day when the load is less than usual and the electricity charge is low, and the maximum load time is the time when the load is used the most during the day.

The time defined by the light load time period and the maximum load time period is an example, and it may be changed according to the KEPCO, and it may be set differently according to the season or the day of the week.

In other words, the CNG charging station according to the present invention can selectively control the power generation source supplied to the CNG charging station according to the power consumption amount and the power generation amount according to the time period, and thereby, the peak power can be efficiently managed.

Meanwhile, since the triple power generation system 300 according to the present invention is distinguished from the conventional triple power generation system, the detailed configuration thereof will be described in detail.

In the case of a conventional triple power generation system, a gas engine is firstly supplied with gaseous fuel and converted to a power. The generator receives power of the gas engine to produce electricity. The generator has a high-temperature cooling water To the absorption-type cold / hot water heater, and it is used as cooling energy in the summer and heating energy in the winter season.

The problem with this existing triple power generation system is that the heat energy required for the absorption type cold and hot water generator is dependent on the power generation amount. Accordingly, when the power consumption (power generation amount) is small, the heat energy to be produced is also decreased. If the heating and cooling demand exceeds the supply, additional power generation or additional cooling and heating facilities should be provided unnecessarily.

In other words, the existing triple-power generation system mainly focuses on power generation, and thus there is a problem that it can not flexibly respond to various energy demand patterns of power consumers.

However, since the triple power generation system 300 according to the present invention plays a role not only as an auxiliary power source for the natural gas compressor 100 but also for supplying the cooling and heating energy to the charging station management facility 400, 400) to meet the heating and cooling demand.

Accordingly, the present invention provides a triple power generation system 300 that is structurally improved to flexibly convert the energy type between power, cooling energy, and heating energy in accordance with a user's various energy demand patterns.

4 is a schematic view of a tritium generation system 300 applied to the present invention. Referring to FIG. 4, the tritium generation system 300 applied to the present invention includes a gas engine, a generator, a cooling and heating apparatus, an arrangement recovery apparatus, and an arrangement utilization apparatus.

A gas engine is a heat engine that burns natural gas and converts it to power. For example, a gas combustion piston engine may be used. That is, the natural gas is burned to drive the piston, and the reciprocating motion of the piston can be converted into rotational motion of the shaft.

The generator is selectively coupled to the gas engine. That is, the first power control unit may not be mechanically coupled to the rotational axis of the gas engine, or may not be coupled. When the generator is coupled to the rotary shaft of the gas engine, the rotary motion is produced as electric power.

The heating and cooling apparatus is for converting the power of the gas engine into cooling or heating energy. The heating and cooling apparatus is also selectively coupled to the gas engine by the second power control unit, like the generator. Unlike the existing triple power generation system, the present invention is characterized in that the cooling / heating energy is produced by directly connecting the cooling / heating device to the gas engine.

In the present invention, the cooling and heating apparatus may employ various types of refrigeration cycle and heat pump cycle. For example, the cycle system used in this embodiment includes a compressor, a first heat exchanger that performs heat exchange with air, a second heat exchanger that performs heat exchange with the cooling and heating fluid, and an expansion that is installed between the first heat exchanger and the second heat exchanger Valve. The compressor can be coupled and disengaged by the second power control unit to the gas engine.

The case of the refrigeration cycle will be described first. In Fig. 4, a blue arrow indicates the circulation direction of the refrigerant in the refrigeration cycle.

The refrigerant in a vapor state is adiabatically compressed in the compressor and flows into the first heat exchanger through the four-way valve in a state of high temperature and high pressure. In the first heat exchanger, the refrigerant undergoes an equi-pressure cooling process. That is, as heat is transferred from the refrigerant to the air, the refrigerant is condensed while changing into a liquid state. When the cooling and heating apparatus is utilized as a cooling cycle, the first heat exchanger serves as a condenser in the refrigeration cycle. The refrigerant discharged from the first heat exchanger passes through the expansion valve and is thermally expanded to be converted into a low-temperature and low-pressure state. The refrigerant flows into the second heat exchanger and is heat-exchanged with the cooling / heating fluid. After the refrigerant is heated under equal pressure, the refrigerant flows back into the compressor to complete the cycle. In the refrigeration cycle, the second heat exchanger serves as an evaporator. The second heat exchanger performs heat exchange with the refrigerant and performs cooling of the building using the cooled fluid.

Next, the heat pump cycle is explained. The heat pump cycle is indicated by the red arrow in FIG. 4, which forms a cycle in the opposite direction to the refrigeration cycle.

The refrigerant vapor, which is adiabatically compressed in the compressor, is cooled under equilibrium while passing through the four-way valve and the second heat exchanger. That is, the heating / cooling fluid is heat-exchanged with the cooling / heating fluid and then is condensed to be liquid-phase. When the heating / cooling unit is used as a heat pump cycle, the second heat exchanger functions as a condenser. The building is heated using the heating / cooling fluid. The refrigerant exiting the second heat exchanger is thermally expanded in the expansion valve to become a low-temperature and low-pressure state. The refrigerant passes through the first heat exchanger, receives heat from the air, changes into a refrigerant vapor state, and flows into the compressor. In the heat pump cycle, the first heat exchanger serves as an evaporator.

That is, in the refrigeration cycle, the first heat exchanger serves as a condenser, the second heat exchanger serves as an evaporator, and conversely, when utilized as a heat pump cycle, a first heat exchanger serves as an evaporator and a second heat exchanger serves as a condenser. The refrigeration cycle and the heat pump cycle are already well-known technologies and will not be described in further detail.

In the present invention, whether the cooling / heating apparatus is used as a refrigeration cycle or a heat pump cycle is determined by the circulation direction of the refrigerant. The circulation direction of the refrigerant can be controlled by a four-way valve connected to the compressor. The compressor, the first heat exchanger, the compressor and the second heat exchanger are both connected only through the four-way valve. The refrigerant from the compressor is guided from the four-way valve to the first heat exchanger or the second heat exchanger to determine the refrigeration cycle and the heat pump cycle.

The cooling / heating fluid can be used for cooling and heating immediately after heat exchange in the cooling / heating device. However, the cooling / heating fluid may be temporarily stored in the heat-treated water tank as shown in FIG.

On the other hand, in the present invention, only one compressor may be used, but a plurality of compressors may be used in order to correspond to the ratio of various power loads and cooling and heating loads of a consumer. In the present embodiment, two compressors are used. Therefore, two second power control units are also provided. Two compressors may be driven together, only one compressor may be driven, or the compressor may not be driven in some cases. Hereinafter, the operation mode of the triple power generation system 300 according to the present invention will be described again.

In addition, each compressor can use a compression capacity of 100%, but it can be installed in the compressor and control the refrigerant flow rate of the system step by step by sending part of the refrigerant vapor of the compressor discharge pipe to the compressor suction pipe through the bypass valve control. In addition, it is possible to operate 5 ~ 100% compared to the rated cooling / heating capacity through the control of the compressor rotation speed.

The batch recovery apparatus is for recovering heat of a high temperature exhaust gas generated as a combustion by-product in a gas engine. It is also used to recover the heat of the heated cooling water after cooling the gas engine. The flue gas of the gas engine is at a high temperature of about 400 to 600 ° C., and the cooling water is about 70 to 90 ° C. while cooling the gas engine.

In the batch recovery device, the cooling water is heated and heated by the flue gas, and then circulated along the route indicated by A1 in Fig. That is, the heated cooling water flows into the arrangement utilizing device and is utilized as thermal energy. The cooling water is cooled through the heat transfer process in the arrangement utilizing apparatus and then circulated back to the gas engine. The exhaust gas is discharged to the outside after heat transfer in the batch recovery device.

However, a three-way valve is provided between the array recovery device and the arrangement utilizing device so that the cooling water can be circulated along the route indicated by A2 in Fig. 4 without being sent to the arrangement utilizing device. In the first heat exchanger, when the cooling / heating device is used as a heat pump cycle in winter, the refrigerant must absorb heat from the air in the first heat exchanger. If the outdoor air temperature is low, Ability can be reduced. At this time, by controlling the three-way valve, high-temperature cooling water is sent to the first heat exchanger from the exhaust heat collecting device so that the refrigerant can be heated to a high temperature. The cooling water is again returned to the gas engine and circulated.

Meanwhile, although the refrigerant can be heated as described above, a method of increasing the efficiency by increasing the compression ratio of the refrigerant cycle by heating the air toward the evaporator is also applicable.

In the example described above, the cooling water itself acts as a heat transfer medium that transfers heat in the array utilization device or the first heat exchanger after heat exchange in the array recovery device. However, depending on the embodiment, a separate thermal fluid may be used instead of directly using the cooling water as the heat transfer medium. For example, in a batch recovery apparatus, a separate heat fluid may be heat-exchanged with the cooling water and the exhaust gas, and then sent to the array utilization device or the first heat exchanger to form a circulation cycle. At this time, the cooling water can be circulated in such a manner that it returns to the gas engine immediately after heat exchange in the batch recovery device.

The array utilization device is for converting heat energy recovered from the array recovery device into electric power or for cooling / heating.

Various devices can be used as the array utilizing device. For example, an ORC (Organic Rankine Cycle) may be used to generate additional power using an arrangement generated in a gas engine, or an arrangement may be used as a heat source for applying heat to the adsorbent provided in the dehumidification cooling apparatus.

In addition, an absorption type cold / hot water generator may be used to use the arrangement utilizing device for cooling and heating. The absorption type cold / hot water heater uses the arrangement generated from the gas engine as a heat source to further heat or cool the cooling / heating fluid. The cooling / heating fluid may be used to perform direct cooling and heating, and may be temporarily stored in a water-heat-treated water tank as shown in FIG.

The organic Rankine cycle, the dehumidification cooling apparatus and the absorption type cold and hot water generator are well known in the art and will not be described in detail.

The greatest structural feature of the triple power generation system 300 according to the present invention described above is that the compressor for cooling and heating is directly connected to the gas engine.

In the conventional triple power generation system, only the generator is directly connected to the gas engine, and the cooling and heating is performed by utilizing the arrangement from the generator. In other words, power generation has priority and additional cooling and heating is performed by using waste heat as a byproduct of power generation.

However, in the triple power generation system 300 according to the present invention, the generator and the compressor are directly coupled to the gas engine in order to flexibly cope with various energy check patterns of the consumer and flexibly cope with the heating / cooling demand of the charging station management facility 400 So that the production rate of the electric power and the cooling and heating energy can be adjusted to a desired ratio.

The triple power generation system 300 according to the present invention can be operated in five modes, that is, a cooling mode, a heating mode, a cooling-power generation mode, a heating-power generation mode, and a power generation mode according to an energy usage pattern.

In the cooling mode and the heating mode, the generator is not coupled to the gas engine, but only the compressor is coupled to the gas engine. The array utilization device maintains the operating state in all five modes.

That is, in the cooling mode and the heating mode, the generator does not operate but uses only the cooling and heating device and the array utilizing device. The heating / cooling apparatus operates in a refrigeration cycle in a cooling mode and a heat pump cycle in a heating mode to produce cooling energy or heating energy, and the arrangement utilizing apparatus can convert heat energy recovered from the arrangement recovery apparatus into electric power or utilize it for cooling or heating .

Both the cooling mode and the heating mode are prepared for cases where the cooling / heating load is very large in the energy demand pattern. However, since it is common for power generation and heating and cooling to take place at the same time, a mode of performing both cooling and heating and power generation is important.

In the cooling-power generation mode, both the compressor and the generator are operated. Generators produce electricity, and cooling and heating devices operate in a refrigeration cycle to produce cold. The array utilization device can convert the heat energy recovered from the array recovery device to electric power or utilize it for cooling or heating.

The important point here is that two compressors can be used to control the cooling capacity. Two compressors can be operated with one or both compressors, and each compressor can be controlled to exhibit compressibility in two steps of 50% and 100%. If we look at the total compression capacity of two compressors as 100, we can control the compression capacity in four steps of 25%, 50%, 75% and 100%. Therefore, when the cooling load is large, the power generation is reduced while operating at 75% and 100%. When the power load is large and the cooling load is small, the compressor is operated at 25% and 50% .

The heating-power mode also activates both the generator, the heating and cooling unit, and the array utilization unit. The heating / cooling system operates by a heat pump cycle to generate heat for heating. At this time, the compressor can be actively coped with the heating load and the power load by adjusting the compression capacity in four stages through selective use of the two compressors and algebraic control.

Finally, the power generation mode is a mode for the case where the power load is large, and only the generator is operated and the cooling and heating apparatus is not operated. Of course, you can also use array-based devices to produce additional power, or to generate a little cooling and heating energy.

As described above, the triple power generation system 300 according to the present invention can freely control the ratio of the low power generation and the cooling / heating energy generation unlike the existing triple power generation system. Therefore, the triple power generation system 300 can actively cope with various energy consumption patterns of the user There is an advantage to be able to.

The triple power generation system 300 according to the present invention having such an improved structure is provided with a CNG charging station combined with the charging station management facility 400 and a CNG charging station combined with the charging station management facility 400, It can be applied very well to the charging station service.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: natural gas compressor 200: main power supply
300: Mie Power Generation System 400: Charging Station Management Facility
500: ESS (Energy Storage System)

Claims (9)

A CNG charging station for providing services in a form combined with a charging station management facility,
A main power supply unit for supplying system power to the CNG charging station,
And a triple power generation system for integrally producing power and cooling / heating energy using natural gas as a fuel, and supplying auxiliary power to the CNG charging station,
And supplies power and cooling / heating energy produced by the triple power generation system to a management facility of the charging station.
CNG charging station including triple power generation system.
The method according to claim 1,
Further comprising an ESS (Energy Storage System) for receiving and storing power from the main power supply unit or the triple power generation system,
Wherein the power supplied to the CNG charging station is selectively supplied from at least one of the main power supply unit, the triple power generation system, and the ESS.
CNG charging station including triple power generation system.
The method of claim 2,
Characterized in that said triple power generation system uses natural gas handled by said CNG charging station as fuel,
CNG charging station including triple power generation system.
The method of claim 2,
Wherein the charging station management facility includes at least one of an office room, a shower room, a car wash facility, and a control room,
CNG charging station including triple power generation system.
The method according to claim 1,
In the triple power generation system,
A gas engine that receives natural gas and burns it and converts it into rotary power;
A generator detachably connected to the gas engine by a first power control unit to selectively generate power;
A cooling / heating device detachably connected to the gas engine by a second power control unit to perform cooling or heating;
An arrangement recovery device for recovering heat of exhaust gas of the gas engine; And
And an array utilizing device that converts the array retrieved by the array retrieving device into energy,
Wherein the power generated by the gas engine is capable of being fluidly switched to energy of at least one of power energy, cooling energy, and heating energy.
CNG charging station including triple power generation system.
A method of operating a CNG charging station comprising a triple power generation system,
The CNG charging station includes a triple power generation system capable of simultaneously generating electric power and cooling / heating energy, and an ESS (Energy Storage System) receiving and storing electric power supplied from the electric power generating system or the triple power generation system ,
Characterized in that the power required for the CNG charging station is selectively supplied from at least one of the KEPCO power grid, the triple power generation system and the ESS.
A method of operating a CNG charging station including a triple power generation system.
The method of claim 6,
Wherein the CNG charging station provides a service in a form associated with a charging station management facility and supplies the cooling / heating energy produced by the triplex generation system to the charging station management facility.
A method of operating a CNG charging station including a triple power generation system.
The method of claim 7,
Wherein the triple power generation system is operated at an operating time of the refueling station management facility to produce power and cooling / heating energy.
A method of operating a CNG charging station including a triple power generation system.
The method of claim 6,
The electric power supplied through the KEPCO power network is stored in the ESS during the light load period where the electric power charge is low,
Characterized in that at least one of the electric power supplied through the electric power generating electric power network, the electric power produced by the triple electric power generating system, and the electric power stored in the ESS is selectively supplied to the CNG charging station in the maximum load time period in which the electric power charge is high ,
A method of operating a CNG charging station including a triple power generation system.

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