KR20180128716A - Muti-functional internal combustion engine system generator for generating electric power - Google Patents

Abstract

The present invention provides a multi-functional power generating internal combustion engine system generator comprising: an engine for generating the power by burning an energy source; an engine controller for controlling driving of the engine; an alternator connected directly to the engine and generating AC power using the power of the engine; a power generation control unit connected to the alternator to convert the AC power into DC power; an inverter unit connected to the power generation control unit for converting the DC power into three-phase AC power; a heat recovery unit for recovering at least one of heat of the engine and heat contained in exhaust gas of the engine; and a compressor unit directly connected to the engine and capable of compressing and delivering a refrigerant.

Description

MULTI-FUNCTIONAL INTERNAL COMBUSTION ENGINE SYSTEM GENERATOR FOR GENERATING ELECTRIC POWER

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generating internal combustion engine system generator, and more particularly, to a power generating internal combustion engine system generator which is capable of performing heat production through compressor recovery, And more particularly, to a multi-functional power production internal combustion engine system generator.

An internal combustion engine system generator is mainly used as a place or an emergency power supply that can not supplement the required power of a consumer using commercial power or use power. For example, when used as an emergency power supply device, it is possible to supply an electric power by driving an engine of an internal combustion engine system in a place where commercial power can not be used.

Such an internal combustion engine system generator is configured such that the number of revolutions of the power generating body is fixed at 1800 rpm corresponding to an integral multiple of 60 Hz or at 1500 rpm corresponding to an integral multiple of 50 Hz and the number of revolutions of the internal combustion engine directly connected to the power generating body is fixed It is generally used. Therefore, the known internal combustion engine system generator is required to supply electricity of the same or high quality as the electric quality supplied from the existing commercial system to the use place such as the consumer, because the frequency or the voltage is larger than the deviation of the frequency or voltage supplied from the strategic system It is showing the limit.

For example, in the case of a pure electric vehicle, there is no emergency charging method when the high voltage battery mounted on the vehicle is discharged during operation. When the service vehicle is used, it takes a long time to charge the battery and the efficiency becomes ineffective. The battery can be used for charging. In this case, the life of the battery is shortened or damaged. In particular, when the high voltage battery of the hybrid vehicle is charged, the supply power of the internal combustion engine system generator can not be appropriately varied despite the load fluctuation, thereby damaging the battery.

Moreover, the highest efficiency point of the internal combustion engine is at the highest load point of the engine speed, and the output of the internal combustion engine also has a linear relationship that rises as the engine speed rises, and the highest efficiency point of the internal combustion engine is generally The operation of the internal combustion engine at the fixed engine speed is very disadvantageous in terms of the efficiency of the engine in that it is seen at a point of 2500 rpm or more rather than 1500 rpm or 1800 rpm set as the fixed rotation speed of the internal combustion engine system generator. When the internal combustion engine is operated at a fixed engine speed, there is also a problem that the energy production density is low.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a hybrid power supply system capable of performing power generation and heat generation using heat recovery of an engine and exhaust gas, And to provide a production internal combustion engine system generator.

The present invention also provides a multifunctional power generating internal combustion engine system generator capable of generating power while following an engine optimum fuel consumption operating point which is a point at which the fuel consumption rate of the engine becomes minimum with respect to a required power generation amount while varying the engine speed .

In order to accomplish the above object, the present invention provides an engine for generating power by burning an energy source; An engine controller for controlling driving of the engine; An alternator connected directly to the engine to generate AC power using the power of the engine; A power generation controller connected to the alternator to convert the alternating power into direct current; An inverter connected to the power generation control unit for converting the DC power into three-phase AC power; A heat recovery unit for recovering at least one of heat of the engine and heat contained in exhaust gas of the engine; And a compressor unit directly connected to the engine and capable of compressing and delivering the refrigerant.

According to the present invention, there is provided an energy storage unit connected to the power generation control unit and storing DC power output from the power generation control unit.

According to the present invention, the air conditioner further includes a heating / cooling unit or a hot water tank connected to the heat recovery unit.

According to the present invention, the cooling / heating device may be a medium temperature water absorption type cooler.

According to the present invention, the heat recovery unit can be used as a heat source for heating the air introduced through the intake duct.

According to the present invention, there is provided a cooling and heating circuit unit connected to the compressor and capable of performing cooling and heating by circulation of refrigerant, wherein the compressor is a compressor for compressing and delivering the refrigerant in the cooling and heating circuit unit.

According to the present invention, there is further provided a control unit connected to the alternator and the power generation control unit. When the engine start command is input, the controller performs engine cracking for driving the engine through the alternator in an engine start stop state .

According to the present invention, when the engine is started by the engine cracking, the control unit rotates the engine at a predetermined idle speed, and the engine is stabilized at the idle speed and the engine speed is increased to the power generation start engine speed When the engine is stabilized at the post-generation start engine speed, the operation is controlled so as to start the operation for generating electric power.

According to the present invention, after the AC generator performs engine cranking, the control unit performs the zero torque control until starting the operation for generating electric power.

According to the present invention, the control unit varies the engine rotation speed while following the engine optimum fuel consumption operating point, which is a point at which the fuel consumption rate of the engine becomes minimum with respect to the required power generation amount during operation for power production.

According to the present invention, the engine optimum fuel economy operating point is determined by a control amount u that minimizes the following price function (S, Cost Function).

[General engine model expression]

[Equation]

here,

; 엔진 상태 변수

; Engine state variables

)u = optimum engine torque demand (

)

v = engine speed requirement

A = engine characteristic matrix

B = engine output control input vector

C = engine output matrix [engine torque, engine speed]

D = engine speed control input vector

)r is the engine torque demand weight constant (

)

)q is the fuel efficiency weighting constant (

)

)s is the reciprocal weighting constant (

)

는 엔진 특성 메트릭스를 소정의 응답성능을 만족시키기 위하여 엔진 특성 조정을 위한 특성 변수로서 엔진별 요구성능 별 상이하게 설정되는 상수.

Is a constant that is set differently for each engine as a characteristic parameter for adjusting the engine characteristic so as to satisfy predetermined response performance.

According to the present invention, the power generation control section includes first to third series circuits each including six switch elements constituting a three-phase pulse width modulation inverter, each of which is composed of two switch elements connected in series with each other, 1 to a third series circuit are connected in parallel and include a DC link capacitor including a first capacitor C1 and a second capacitor C2 connected in parallel to each other in parallel at an output terminal of the power generation control unit.

According to the present invention, the inverter section includes first to third series circuits each including six switching elements constituting a three-phase pulse width modulation inverter, each of which is composed of two switching elements connected in series to each other, Wherein the first to third inductors L1 and L2 are connected in series between a connection node between the two switch elements of each of the series circuits and each output terminal, And a capacitor C connected to the output terminal of the inductor L1.

According to the present invention, beyond the conventional concept of producing power only at a low engine speed, such as a fixed engine speed, for example, 1,800 rpm 60 Hz or 1,500 rpm 50 Hz, in a known internal combustion engine system generator, At high engine speeds, such as rpm or 3,000 rpm, power can be produced at any frequency, regardless of frequency of use, to increase power production density.

According to the present invention, it is possible to integrate a heat supply and a cooling / heating supply system using a compressor while maintaining electric power production in an internal combustion engine system generator.

According to the present invention, it is possible to solve the problem of damaging the load due to failure to appropriately change the supply power in accordance with the load variation in the internal combustion engine system generator. As a result, it is possible to stably supply the electric power generated by the internal combustion engine system generator with high-quality AC power irrespective of the load fluctuation. Further, DC power and three-phase AC power can be effectively supplied from AC power.

According to the present invention, a high-voltage battery is provided, so that the power required for the consumer can be supplied without interruption from the power system power failure.

According to the present invention, the engine heat and the exhaust gas heat are collected and used as a heat source for heating or hot water supply, so that the energy of the multi-functional power generating internal combustion engine system generator can be utilized effectively.

In addition, the compressor can be installed in parallel with the AC generator directly connected to the engine to be used as a heat pump for cooling or heating purposes.

According to the present invention, it is possible to select an appropriate number of revolutions and an engine load point that can be produced at the optimum fuel efficiency by utilizing information on the optimum fuel efficiency with respect to the number of revolutions of the engine, It is possible to drive while. The present invention provides a method of using the output of the engine at the same time while varying the number of revolutions of the engine in comparison with the method using the output of the engine at the existing fixed engine speed, There is an effect that it is possible to find and operate the rotation speed driving point.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1A is a configuration diagram of a multi-function power generating internal combustion engine system generator according to a first embodiment of the present invention; FIG.
1B is a perspective view of a multi-function power generating internal combustion engine system according to a first embodiment of the present invention;
2 is a configuration diagram of a multi-function power generating internal combustion engine system generator according to a second embodiment of the present invention;
3 is a configuration diagram of a multifunctional power generating internal combustion engine system generator according to a third embodiment of the present invention;
4 is a configuration diagram of a multifunctional power generating internal combustion engine system generator according to a fourth embodiment of the present invention;
5 is a configuration diagram of a multi-function power generating internal combustion engine system generator according to a fifth embodiment of the present invention.
6 is a configuration diagram of a multi-function power generating internal combustion engine system generator according to a sixth embodiment of the present invention.
FIG. 7 is a circuit diagram for explaining a power generation control unit, an inverter unit, and a connection relationship of the multifunctional power generating internal combustion engine system generator according to the present invention. FIG.
8 is a view for explaining a method of operating a multi-function power generating internal combustion engine system generator according to the present invention.
9 is a flowchart for explaining an engine starting step;
FIG. 10 is a diagram showing a driving path on a TN (Torque-rpm) curve in the power control operation stage in the multi-function power generating internal combustion engine system generator according to the present invention.
FIG. 11 is a view sequentially showing a method in which a power control operation is performed along the optimal driving route shown in FIG. 10; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a multi-function power generating internal combustion engine system generator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1A is a configuration diagram of a multi-function power generating internal combustion engine system generator according to a first embodiment of the present invention, and FIG. 1B is a perspective view of a multi-function power generating internal combustion engine system according to a first embodiment of the present invention.

The multifunctional power generating internal combustion engine system generator 1 according to the present invention includes an engine 100, an engine control unit 200, an alternator 300, a power generation control unit 400, (500), a heat recovery unit (600), and a compressor (700). The air conditioner further includes an air conditioning circuit unit 750 connected to the compressor 700 and an energy storage unit 800 connected to the power generation control unit 400.

The engine 100 generates mechanical power and heat by burning a predetermined energy source such as gasoline, diesel, LPG, natural gas, and hydrogen. Such an engine may generally be referred to as an internal combustion engine.

The engine control unit 200 controls the operation of the engine. The engine control unit 200 controls the engine 100 to operate in a load operation at a given engine speed in accordance with the amount of power production required and moves the operating point of the engine to the optimum fuel consumption operating point for producing the electric output. Further, it is possible to control the power transmission to the compressor 700 by controlling a switch (not shown) capable of interrupting a clutch (not shown) built in the compressor 700.

The AC generator 300 is directly connected to the engine 100 and receives the mechanical power of the engine 100 to generate AC power while rotating. The alternator 300 can produce AC power having a predetermined frequency and voltage in accordance with the rotation of the engine. The alternator 300 may be a rotator type or a rotary type alternator, and the type thereof is not limited.

According to the present invention, the alternator 300 can be used as a power generation motor that drives the engine to start power generation. The AC generator 300 may be supplied with power from commercial power in an opposite path where power produced according to the engine output is supplied to the outside or may be supplied with power from the energy storage unit 800 to perform engine cracking . As a result, the multifunctional power generating internal combustion engine system generator according to the present invention does not need to have a separate starting motor.

The power generation control unit 400 is connected to the alternator 300 to convert AC power into DC power. The power generation control unit 400 performs a function of modifying into DC power and a function of selecting an optimum engine speed point for producing power required in a predetermined engine speed band (for example, 1,500 rpm to 3,000 rpm). The power generation control unit 400 controls to produce a predetermined electric output while moving the predetermined engine revolution speed band.

The power generation control unit 400 can be used to determine the amount of power generation by receiving information on the battery from the battery control unit included in the energy storage unit 800. [

The inverter unit 500 functions to transform DC power into AC power in response to a load required by an external facility or a customer. The inverter unit 500 may include an LCL filter 580 composed of an inductor and a capacitor to supply electric power of appropriate quality to external equipment and a customer.

In addition, the inverter unit 500 may monitor a predetermined quality monitoring item to properly maintain the quality of power supplied to the external equipment and the customer.

The energy storage unit 800 includes a battery and is connected to the power generation control unit 400 to store the DC power output from the power generation control unit 400. The energy storage unit 800 may include a charge and discharge control unit to provide the power generation control unit 400 with related information of the energy storage unit 800.

The energy storage unit 800 enables the multifunctional power generating internal combustion engine system generator according to the present invention to be used as an emergency power generation facility to prepare for the suspension of the commercial power system. In addition, when the multifunctional power generating internal combustion engine system generator according to the present invention is installed in an electric vehicle, the energy storage unit 800 may be a battery of an electric vehicle. In this case, So that the vehicle can be operated.

The heat recovery unit 600 is provided to recover the heat contained in the cooling water and the exhaust gas of the engine 100. The heat recovery unit 600 includes an engine arrangement recovery duct 610 passing through the exhaust pipe 110 of the engine 100 and a cooling water duct 620 passing through the engine 100. [ The cooling water conduit 620 is a flow path of cooling water for cooling the engine 100, and absorbs heat generated by the engine. The engine arrangement return duct 610 is a heat exchanger for heat exchange with the exhaust gas passing through the engine exhaust duct 110, and absorbs the engine arrangement. Water flows along the heat recovery unit 600 and absorbs the heat of the engine 100 and the exhaust pipe 110 of the engine 100. [

The heat recovery unit 600 is connected to other devices requiring the heat produced by the engine 100 at the inlet side and the outlet side so as to provide heat generated by the multi-functional power generating internal combustion engine generator while the water circulates. For example, the heat contained in the engine and the exhaust gas is recovered to supply heat to the heating / cooling device of the external equipment or the external hot water supply mechanism. The heat recovery unit 600 includes at least one of a cooling water duct 620 and an engine arrangement return duct 610, and may preferably include all of them.

The compressor (700) is directly driven by the engine and is driven by the power of the engine (100). According to the embodiment of the present invention, the compressor 700 is connected to the cooling / heating circuit unit 750 and functions to compress and discharge the refrigerant by the driving force of the engine 100.

The compressor 700 includes a clutch so that power transmission from the engine 100 can be interrupted.

An engine control unit 200, an alternator 300, a power generation control unit 400, an inverter control unit 400, and an inverter control unit 400 are provided in a main body 10 of the multifunctional power generation internal combustion engine system generator according to the first embodiment of the present invention. (500), a heat recovery unit (600), and a compressor (700) are integrated into one unit, and some components can be selectively used. For example, the compressor 700 is selectively controlled. In other words, the multifunctional power generating internal combustion engine system generator according to the present invention may be configured to selectively perform other functions in addition to the original function of generating electric power, and the system itself may include such a component in advance and be used as needed.

2 is a configuration diagram of a multi-function power generating internal combustion engine system generator according to a second embodiment of the present invention. In FIG. 2, for simplicity of the drawing, a part of the structure overlapping with the structure shown in FIG. 1 is omitted.

Referring to FIGS. 1B and 2, the multifunctional power generating internal combustion engine system generator according to the second embodiment of the present invention includes an engine 100, an engine control unit 200, an alternator 300, a power generation control unit 400, An inverter unit 500, a heat recovery unit 600, a compressor 700, a medium temperature water absorption type cooler 900, and a fan coil unit 910. The hot water absorption cooling unit 900 produces cold water, and the fan coil unit 910 is connected to the medium temperature water absorption cooling unit 900 to supply cool air to a place where cool air is used. According to the second embodiment of the present invention, the engine 100, the engine control unit 200, the alternator 300, the power generation control unit 400, the inverter unit 500, the heat recovery unit 600, the compressor 700, The engine 100, the engine control unit 200, the alternator 300, and the power generation control unit 900, except for the intermediate-temperature water absorption type cooler 900, can be integrated into the frame 10, 400, the inverter unit 500, the heat recovery unit 600, and the compressor 700 may be integrated into the frame 10.

According to the second embodiment of the present invention, the clutch is operated by the switching control of the engine control unit 200 to interrupt the power transmission to the engine 100 to the compressor 700, and the compressor 700 is not used .

The intermediate-temperature water absorption type cooler 900 includes a regenerator, a condenser, an evaporator, and an absorber. Water is used as a refrigerant and is a known device mainly using an aqueous solution of lithium bromide (LiBr) as an absorption liquid. The evaporator maintains a vacuum state at a pressure lower than the atmospheric pressure so that the refrigerant evaporates and cools the temperature of the water supplied to the heat exchanger to produce cold water. The absorber absorbs vaporized refrigerant vapor in the process of making cold water in the evaporator. The regenerator absorbs the vapor of the refrigerant and heats the diluted absorption liquid to produce a concentrated solution, which is supplied to the absorber. The vapor of the refrigerant evaporating as it is heated is again condensed and supplied to the evaporator. The medium-temperature water absorption type cooler is configured so that medium temperature water of 90 to 120 deg. C is generally used as a heat source of the regenerator, and heat exchange with the absorption liquid flows through the medium temperature water supply pipe in the regenerator.

According to the embodiment of the present invention, the outlet side 604 of the heat recovery unit 600 is connected to the inlet side of the intermediate-temperature water supply pipe of the regenerator in the intermediate-temperature water absorption type cooler 900, The inlet side 620 of the heat exchanger 600 is connected. As a result, the heat recovery unit 600 is used as the medium temperature water supply source of the medium temperature water absorption type cooler 900.

The fan coil unit 910 supplies cold water produced by the cold water absorption type cooler 900 and supplies cool air to a required place where cooling is required.

3 is a block diagram of a multifunctional power generating internal combustion engine system generator according to a third embodiment of the present invention. FIG. 3 is omitted in order to partially illustrate some of the elements overlapping with FIG. 1 for convenience of illustration.

3, the multifunctional power generating internal combustion engine system according to the third embodiment of the present invention includes an engine 100, an engine control unit 200, an alternator 300, a power generation control unit 400 ), An inverter unit 500, a heat recovery unit 600, and a compressor 700 are integrated into one device. The multifunctional power generating internal combustion engine system according to the third embodiment of the present invention includes a boiler 922, a hot water tank 924, a medium temperature water absorption type cooler 910, a cooling tower 926, (910). The fan coil unit 910 is provided to provide cool air to a use place requiring cooling, and may be configured in various forms such as an AHU (Air Handling Unit) without limitation.

The boiler 922 generates heat by burning an energy source such as a gas. In FIG. 3, the boiler 922 is shown as being integrated with the hot water tank 924, but it is not limited thereto and may be formed separately from the hot water tank 924 as a general boiler type.

The hot water produced by the heating of the boiler 922 is stored in the hot water tank 924 and the hot water stored in the hot water tank 924 can be used as hot water for hot water supply. Can be used. The hot water tank 924 can be used only as a heat source for supplying the hot water to the regenerator of the hot water absorption type cooler 910. In this case, the hot water input / output in the hot water tank 924 can be used only with the hot water absorption type cooler 910 And the hot water in the hot water tank 924 can be directly supplied to the hot water tank 924 without a separate heat exchanger for heat exchange with hot water supplied to the hot water absorption type cooler 910. [

According to the third embodiment of the present invention, the outlet side 604 of the heat recovery unit 600 is connected to the inlet side of the intermediate-temperature water supply pipe of the regenerator in the intermediate-temperature water absorption type cooler 900, The inlet side 620 of the heat recovery unit 600 is connected and the water outlet side 604 of the heat recovery unit 600 is provided with a first heat exchanger for heat exchange with the hot water provided from the hot water tank 924, A second heat exchanger for heat exchange with water circulating the cooling tower is installed on the water inlet side 602 of the unit 600. Accordingly, the heat recovery unit 600 functions to assist the amount of heat supplied from the boiler 922. The heat produced by the heating of the boiler 922 and the heat produced by the heat recovery unit 600 are used as a heat source for supplying the medium temperature water to the regenerator of the medium temperature water absorption type cooler 910. It is possible to circulate the remaining heat by using the cooling tower 926 and assist the heat input from the hot water tank 924 to the medium temperature water absorption type cooler 910, It is possible to reduce the amount of heat used. This improves system efficiency.

As described above, in the third embodiment of the present invention, by using the heat recovered from the heat recovery unit as a heat source of the regenerator of the intermediate-temperature water absorption type cooler 910 while generating electric power in the multifunctional power generation internal combustion engine system generator, .

4 is a block diagram of a multifunctional power generating internal combustion engine system generator according to a fourth embodiment of the present invention.

Referring to FIG. 4, the multifunctional power generation internal combustion engine system according to the fourth embodiment of the present invention is an application example in which the present invention is applied to a factory 2 that uses outdoor heat to heat a predetermined product.

Referring to a fourth embodiment of the present invention, there is provided an air conditioning system including an intake duct 930 for providing heat inside the plant 2, and a burner 932 for providing heat to the air flowing along the intake duct 930 . The combustion gas of the burner 932 heats air flowing along the inside of the intake duct 930 while flowing along the combustion duct 933 disposed inside the intake duct 930.

The generated heat source of the heat recovery unit 600, that is, the hot water, and the inside of the intake duct 930 are disposed inside the intake duct 930 toward the front side of the combustion duct path 933, And a heat exchanger 935 for exchanging heat with air introduced into the heat exchanger. Air is firstly heated in the heat exchanger 935, and the air is secondarily heated by the heat provided in the combustion tube path 933. Accordingly, it is possible to reduce the amount of heat supplied from the burner 932 to heat the air to a predetermined target temperature, thereby improving the operating efficiency of the equipment.

5 is a configuration diagram of a multi-function power generating internal combustion engine system generator according to a fifth embodiment of the present invention.

In contrast to the second embodiment of the present invention shown in FIG. 2, the fifth embodiment of the present invention shown in FIG. 5 further includes a cooling / heating circuit unit 750 connected to the compressor 700. The cooling / And supplies the generated cold heat to the fan coil unit 910 through the cold heat exchanger 912. [ A cold heat exchanger 912 is provided on the refrigerant circulation path of the fan coil unit 910 and the medium temperature water absorption type cooler 900. When the cooling and heating circuit unit 750 passes through the cold heat exchanger 912, Cold heat is provided.

Accordingly, it is possible to improve the efficiency of the system by reducing the energy required for cooling the refrigerant in the medium temperature water absorption type cooler 900 and additionally supplying the cool air to the fan coil unit 910.

6 is a configuration diagram of a multi-function power generating internal combustion engine system generator according to a sixth embodiment of the present invention.

The multifunctional power generating internal combustion engine system generator according to the sixth embodiment of the present invention produces the AC power that can be used as a commercial power source.

The multifunctional power generating internal combustion engine system generator according to the sixth embodiment of the present invention further includes a hot water tank 940 for supplying hot water and a heat exchanger (not shown) for heat exchange between the hot water tank 940 and the heat recovery unit 600 942). The coolant (water) in the piping of the heat recovery unit 600 supplies the heat recovered from the multi-function power generation internal combustion engine system generator to the hot water tank 940 through the heat recovery unit 942 through the heat recovery unit 600.

The refrigerant passing through the cooling / heating circuit unit 750 including the compressor 700 supplies cold air to the room through the indoor air conditioner 945.

According to the sixth embodiment of the present invention, since the heat recovery unit 600 is used as an auxiliary heat source of a boiler (not shown) for producing hot water stored in the hot water tank 940, energy consumption in the boiler can be reduced have.

The multi-function power generating internal combustion engine system generator according to the present invention is not limited to the embodiment shown in Figs. 1A to 6, and various applications are possible. For example, a multi-function power generating internal combustion engine system generator according to the present invention can be mounted on a large-sized power-based electric vehicle.

According to the large-capacity power-based electric vehicle, such as an electric bus, equipped with the multi-function power generating internal combustion engine system generator according to the present invention, high-quality high-voltage direct current electric power can be produced through the electric power generation control unit and charged into the battery. Further, the rotation shaft of the engine may be connected to the drive shaft of the electric bus so that the power is transmitted to the wheels. Further, the inverter unit for converting the direct current power of the power generation control unit into the three-phase alternating current power can supply electric power to the electric parts and general electronic parts in the electric bus.

7 is a circuit diagram for explaining a power generation control unit, an inverter unit, and a connection relationship of the multi-function power generating internal combustion engine system generator according to the present invention.

Referring to FIG. 7, the multi-function power generating internal combustion engine system generator according to the embodiment of the present invention includes a power generation control unit 400 configured to implement a three-phase pulse width modulation inverter with six switch elements, two capacitors C1 A DC link capacitor 420 composed of two inductors L1 and L2 and a capacitor C connected in parallel to the inverter 500 and a capacitor C connected to the inverter 500, LCL Filter 580). Where the LCL filter 580 may be replaced by a conventional transformer.

The power generation control unit 400 is for converting AC power of the alternator 300 into DC power and includes a first switch connected to the high voltage side power supply of U + and a second switch connected to the low voltage side potential of U- A second series circuit having a first series circuit, a third switch connected to the high voltage side power supply of V +, and a fourth switch connected to the low voltage side potential of V-; and a fifth series circuit connected to the high voltage side power source of W + And a third series circuit having a switch and a sixth switch connected to the low voltage side potential of W-.

The first to third series circuits are connected in parallel to each other, and both ends or output terminals of the circuits connected in parallel become the high voltage side and the low voltage side. The three-phase output of alternator 300 is connected between two switches of each series circuit.

The first capacitor C1 and the second capacitor C2 constituting the DC link capacitor 420 are connected in parallel to the output terminal of the parallel circuit.

The power generation control unit 400 effectively converts the AC power of the alternator 300 into direct current power by using the inversion method of three-phase pulse width modulation and supplies the converted direct power directly to the load or the inverter unit 500, .

The DC power supplied directly to the load can be used to charge the ESS or high voltage battery 800 as DC high voltage power.

The inverter unit 500 is for converting DC power output from the power generation control unit 400 into AC power and includes six switching elements constituting a three-phase pulse width modulation inverter. The inverter unit 500 includes a first series circuit having a first switch connected to the high voltage side power supply of R + and a second switch connected to the low voltage side potential of R-, and a third series circuit connected to the third high voltage side power supply of S + And a fourth switch connected to the low voltage side potential of the switch S -; and a fifth switch connected to the high voltage side power supply of T + and a sixth switch connected to the low voltage side potential of T- And a third serial circuit. The first to third serial circuits are connected in parallel.

The output terminal of the power generation control unit 400 is directly connected to the input terminal of the inverter unit 500 and the first capacitor C1 and the second capacitor C2 constituting the DC link capacitor 420 are connected in parallel to the input terminal of the inverter unit .

The inverter unit 500 may include a first output terminal R, a second output terminal S, and a third output terminal T as output terminals. The fourth output terminal N uses a LCL filter 580 to indicate a part connected to the commercial power system usually the N phase. If the LCL filter 580 is replaced by a transformer, there may be no fourth output terminal.

The LCL filter 580 is composed of two inductors L1 and L2 and a capacitor C. [ Inductors L1 and L2 may be connected in series between a connection node between two switches of one of the series circuits of the inverter unit 500 and the first output terminal R. [ The capacitor C may be connected in parallel between the output terminal of the inductor L1 or between the first output terminal R and the fourth output terminal N. [ The connection method of the inductors L1 and L2 and the capacitor C at the second output terminal S and the third output terminal T is the same as that at the first output terminal R. The inductors L1 and L2 and the capacitor C form an LCL filter 580 to realize a function as a power factor compensator and a function as a low-pass filter.

According to the multifunctional power generating internal combustion engine system generator according to the present invention, the generator is controlled by a predetermined control signal for controlling the alternator, the power generation controller, and the inverter. The controller may further include a controller 450 for providing the control signal have. The control unit 450 may be a control board having a central processing unit and a peripheral device disposed together, and may be implemented as a system on chip (SOC).

The control unit 450 may include one or more data processors, a peripheral device interface, and a memory interface. The peripheral device interface connects the control unit 450 to the input / output system and various other peripheral devices. The memory interface controls the control unit 450 ) And non-volatile memory.

The control unit 450 may execute various software programs to perform data input, data processing, and data output for controlling the power generation control unit 400, the inverter 500, or the hybrid type power conversion apparatus.

In addition, when an energy storage unit 800 such as a high voltage battery is included, the battery voltage, battery state of charge (SOC), battery state of health (SOH), battery charge / discharge state, battery charge output, It is possible to perform the function of determining the amount of electric power required for production by referring to the information.

In addition, the power generation quality control is performed. In relation to this, the rated frequency variation, the instantaneous maximum frequency variation, the steady state frequency variation, the allowable frequency recovery time, the steady state voltage variation, the instantaneous maximum voltage variation, the voltage recovery time, Monitoring function can be performed.

7 shows an example in which the control unit 450 includes an operation unit 452, a sensing unit 454 for detecting the state of the alternator 300 and a power supply input unit 456 and a communication unit 458 for communication with other devices. This is an example. The control unit 450 is connected to monitor the power generation control unit 400 and the inverter 500 and output a control signal.

8 is a view for explaining a method of operating a multifunctional power generating internal combustion engine system generator according to the present invention.

Referring to FIG. 8, the multi-function power generating internal combustion engine system generator according to the present invention includes an engine start command step S0, an engine startup step S100, a power generation preparation step S200, a power control operation step S300, Power generation interruption and start / stop step S400.

The engine start command step S0 is a step in which an engine start command is externally applied.

The engine startup step S100 includes an engine startup preparing step S110 and an engine cracking step S150. 9 is a flowchart for explaining the engine starting step.

Referring to Fig. 9, the engine startup preparation step (S110) includes an engine startup instruction step (S112) and an engine stop status confirmation step (S114).

If it is determined that the engine start command has been issued, it is determined whether or not the engine is in the stopped state in the engine stop state checking step (S114) Check.

If the engine start command is issued due to an error or the like in the engine operating state, the engine start preparation step (S110) is suspended and the engine is maintained in the operating state.

When it is confirmed that the engine is stopped in the engine stop state checking step S114, the engine cranking step S150 is performed as a normal engine starting procedure.

The engine cracking step S150 includes a step S152 of checking whether the engine is started, a step S154 of applying the generated motor torque to the alternator, a step S156 of confirming the arrival of the engine idle speed, .

In step S152, whether or not the engine is in a startable state is notified to the control unit. If the engine is not in the startable state, a procedure is performed to wait until the engine is ready to start.

The generation motor torque application step (S154) of the alternator is a step of supplying power to the alternator and driving the alternator to the power generation motor to start the engine. The alternator applies torque to rotate the engine at a set cranking revolution (RPM) (for example, 450 rpm) while operating in the generator motor mode. In this process, the engine speed is increased until the idle speed (RPM) is set as the engine is driven by the engine control unit. The idle speed set here is set to a predetermined range.

The engine idle speed reaching confirmation step (S156) is a step for confirming whether the engine is started by the engine cranking and the engine speed has reached the set idle speed.

When the engine speed reaches the set idling speed, it is determined that the engine has been started (S158). The generator motor operation of the alternator is stopped.

The power generation preparation step (S200) includes an engine idle operation establishing step (S210) and a power generation voltage establishing step (S250).

The engine idle operation establishing step (S210) is a step for confirming whether or not the idle operation state of the engine is maintained within the set idle revolution speed of the engine. In the engine idle operation establishing step (S210), for example, when the engine is stopped or an engine failure is determined, or when an alarm lamp is turned on or an engine stop command is received from the outside, the engine is immediately stopped or stopped.

In addition, when the engine speed exceeds the engine speed set by the engine speed, and the engine control unit determines that the engine is in trouble, the engine is immediately stopped. Further, when the engine control unit determines that the engine control unit is not the engine auxiliary unit but the predetermined engine rotational speed stabilization time has elapsed in a state where the engine rotational speed is out of the set range, the engine is stopped.

In the engine idle operation establishment step S210, when the engine is maintained in the set idle speed range and the engine is determined to be in a stable state, the generation voltage establishment step S220 is performed.

The generation voltage establishing step S250 is a step of raising the engine speed to the engine speed target value ENGINE BASE PRM for starting the power generation.

If it is determined in step S250 that the engine speed has reached the target value and the engine speed has exceeded the predetermined speed limit, the engine is immediately stopped.

In addition, when the engine control unit determines that the engine control unit has elapsed the predetermined generation voltage establishing time although the engine control unit is not the auxiliary operation of the engine, the engine startup stop is performed.

In the power generation voltage establishing step S250, the power control operation step S300 is performed when the engine speed is operated within the predetermined range of the number of revolutions set to the target value.

According to the present invention, the engine is subjected to the zero torque control until the engine reaches the target engine speed for starting the generation of electric power. After the generator voltage is established through the generator voltage establishing step (S250), the power control operation is performed, .

Referring to FIG. 8, a generator motor torque applied to the alternator is shown as follows. The alternator is driven by a generator motor in an engine cracking step S150 to apply a torque to the engine. After the engine is started, The zero torque control is performed. In the power control operation step (S300), the alternator performs AC power generation while receiving the engine torque, and performs the zero torque control in the power generation interruption and start / stop step (S400).

When the power generation voltage is established in the power generation voltage establishment step S250, the power control operation step S300 is performed. FIG. 10 is a graph showing a driving route on a torque-rpm curve in a power control operation stage in a multi-function power generating internal combustion engine system generator according to the present invention. In Fig. 10, the dotted line indicates the driving route.

As shown in FIG. 10, the multifunctional power generating internal combustion engine system generator according to the present invention can be operated while tracking the point where the fuel consumption rate of the engine becomes minimum with respect to the power generation amount required at the engine revolution speed. That is, the engine rotation speed is varied to follow the optimum control trajectory. That is, zero torque control is performed until a predetermined number of revolutions, that is, an engine revolution speed target value for establishing a generation voltage (2,000 rpm in FIG. 10) is reached after the engine is started. When the engine revolution speed target value is reached, A load is applied. Thereafter, the engine output and the variable speed control are performed while tracking the point where the fuel consumption rate becomes minimum according to the load variation.

According to the present invention, the control input engine torque demand amount (u) for variable engine speed control and engine speed control is determined to a value that minimizes the following price function (S).

[General engine model expression]

[Equation]

here,

; 엔진 상태 변수

; Engine state variables

)u = optimum engine torque demand (

)

v = engine speed requirement

A = engine characteristic matrix

B = engine output control input vector

C = engine output matrix [engine torque, engine speed]

D = engine speed control input vector

)r is the engine torque demand weight constant (

)

)q is the fuel efficiency weighting constant (

)

)s is the reciprocal weighting constant (

)

는 엔진 특성 메트릭스를 소정의 응답성능을 만족시키기 위하여 엔진 특성 조정을 위한 특성 변수로서 엔진별 요구성능 별 상이하게 설정되는 상수이다.

Is a constant that is set differently for each performance required for each engine as a characteristic parameter for adjusting the engine characteristics in order to satisfy the predetermined response performance of the engine characteristic metrics.

In the above equation, the engine speed and the fuel consumption rate are set as constraint conditions, and the engine torque demand amount that minimizes the constraint conditions is set as the control input.

FIG. 11 is a diagram sequentially illustrating a method of performing a power control operation along the optimal driving route shown in FIG.

The power control operation step S300 includes a power control operation start step S310, an operation point change request step S320, an engine speed deceleration step S330, an engine speed following step S340, A fixing step S350 and a generation power monitoring step S360.

In the power control operation start step S310, the engine speed cruise control in which the engine speed is variable is started. To this end, a control command for starting the engine speed cruise control is input to the control unit.

The operation point change request step (S320) is a stage in which an operation point change request for optimum efficiency operation is inputted after the engine speed cruise control is started. The operation point change request for optimum efficiency operation is input, for example, when the operation point changes along the operation road shown in FIG.

When the operation point change request is input, the engine revolution number fixing step (S330), the engine revolution number following step (S340), and the engine revolution number fixing step (S350) are sequentially progressed.

The engine speed decoupling step (S330) is a step for releasing the fixed number of revolutions at the current engine speed for cruise control of the engine speed. In this specification, the fixing of the number of revolutions means that the engine is operated at a constant speed with a specific engine speed.

The engine speed follow-up step S340 is a step that follows the operation point change request and is changed as the engine speed is increased or decreased.

 The engine speed fixing step S350 is a step of fixing and fixing the engine speed by the current engine speed changed after the follow-up of the engine speed is completed.

 The generation power monitoring step (S360) is a step of monitoring whether the mechanical output and the rotational speed state of the engine at the changed operating point are appropriate for the power generation performance.

If it is determined that the request for changing the operating point is not properly reflected in the power generation monitoring step, the engine freezing step S330, the engine speed follow-up step S340, and the engine speed fixing step S350 are performed again .

In the power control operation step (S300), the power control operation according to the above-described procedure is performed while receiving the operation point change request from time to time. If a forced stop of the engine, a malfunction of the engine, or an engine warning occur in the power control operation phase, a start or stop procedure is performed.

In the present invention, the immediate stop of the engine means that the engine is stopped immediately (engine speed = 0), and the engine stoppage means that the engine is stopped through the power interruption and start / stop step S400.

In step S400, the engine is stopped. In step S410, the engine speed is restored to a predetermined engine speed for establishing the power generation voltage. In step S410, the engine speed is set to the engine idle speed (S430), stabilizing the engine speed at the idle speed (S450), and stopping the engine (S470).

If it is judged that there is a collision or a failure in the engine at each step, the engine is stopped by executing the stop procedure immediately.

According to the present invention, the engine cranking rpm, idle rpm, power generation starting engine speed (target value), and the inertia related to the number of revolutions can be adjusted by adjusting the parameter values of the system generator Capacity and the like.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It should be understood that various modifications made by the person skilled in the art are also within the scope of protection of the present invention.

Claims (12)

An engine for generating power by burning an energy source;
An engine controller for controlling driving of the engine;
An alternator connected directly to the engine to generate AC power using the power of the engine;
A power generation controller connected to the alternator to convert the alternating power into direct current;
An inverter connected to the power generation control unit for converting the DC power into three-phase AC power;
A heat recovery unit for recovering at least one of heat of the engine and heat contained in exhaust gas of the engine; And
And a compressor unit directly connected to the engine and capable of compressing and delivering refrigerant.
The method according to claim 1,
And an energy storage unit connected to the power generation control unit and storing DC power output from the power generation control unit.
The method according to claim 1,
Further comprising a cooling / heating mechanism or a hot water tank connected to the heat recovery unit.
The method of claim 3,
Wherein the cooling / heating device is a medium temperature water absorption type cooler.
The method according to claim 1,
And a cooling / heating circuit unit connected to the compressor and capable of performing cooling / heating by circulation of refrigerant, wherein the compressor is a compressor for compressing / delivering refrigerant in the cooling / heating circuit unit.
The method according to claim 1,
Further comprising a control unit connected to the alternator and the power generation control unit,
Wherein the controller performs engine cracking for driving the engine through the alternator when the engine start command is input.
The method according to claim 6,
The control unit controls the engine to rotate at a predetermined idle speed when the engine is started by the engine cracking, to stabilize the engine at the idle speed, to increase the engine speed at the power generation start engine speed, And when the engine is stabilized in the water, starts operation for power production.
8. The method of claim 7,
Wherein the control unit performs the zero torque control until the AC generator starts the operation for generating electric power after performing the engine cranking.
9. The method of claim 8,
Wherein the control unit varies the engine rotational speed while following an engine optimum fuel consumption operating point that is a point at which the fuel consumption rate of the engine becomes minimum with respect to a required power generation amount during operation for generating electric power. Engine system generator.
9. The method of claim 8,
Wherein the engine optimum fuel economy driving point includes:
Is determined by a control input engine torque demand (u) that minimizes a price function (S) such as: < EMI ID = 3.0 >
[Equation]

here,

; Engine state variables
u = optimum engine torque demand (

)
r is the engine torque demand weight constant (

)
q is the fuel efficiency weighting constant (

)
s is the reciprocal weighting constant (

)
A = engine characteristic matrix
B = engine output control input vector

Is a constant that is set differently for each engine as a characteristic parameter for adjusting the engine characteristic so as to satisfy predetermined response performance.
The method according to claim 1,
Wherein the power generation control section includes first to third series circuits each including six switch elements constituting a three-phase pulse width modulation inverter, each of the first to third series circuits consisting of two switch elements connected in series with each other, The circuit is connected in parallel,
And a DC link capacitor including a first capacitor (C1) and a second capacitor (C2) connected in parallel to each other at an output terminal of the power generation control unit.
The method according to claim 1,
The inverter unit 500 includes six switching elements constituting a three-phase pulse width modulation inverter,
Wherein the first to third series circuits of the inverter section are connected in parallel, and the first to third series circuits are connected in series,
The first and second inductors L1 and L2 are connected in series between the connection node between the two switch elements of each serial circuit and each output terminal and the capacitor C connected to the output terminal of the first inductor L1 Wherein the generator is a multi-function power generating internal combustion engine system generator.

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