JP2021169820A - Gas engine power generation system - Google Patents

Abstract

PURPOSE: To provide a gas engine power generation system that facilitates maintenance/management, can efficiently supply power with a small fuel consumption corresponding to the demand of power, and supplies large power by coupling a large number of power generation units.CONSTITUTION: A gas engine power generation system is equipped with a plurality of power generation units A in which a power generation structure composed of a gas engine 2, an AC generator 51 and the like is stored in a housing 1. Each power generation unit A can independently generate power, and the plurality of power generation units A are electrically coupled in parallel. A total control unit 81 manages the operation and stop of all power generation units A and the magnitude of generated power. DC powers from the respective power generation units A are aggregated and converted to AC power so as to be supplied to a load side. Each power generation units A is equipped on an installed unit rack 9, and has a structure that the power generation unit can be replaced when a malfunction occurs. A frame 7 in which the gas engine 2 and the like are installed can be put in/taken out from the housing 1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a gas engine power generation system that is easy to maintain and manage, can efficiently supply electric power with a small amount of fuel consumption in response to the demand for electric power, and can supply a large amount of electric power by connecting a large number of them.

Conventionally, in an engine generator, it has been common to drive a generator with a plurality of automobile engines or marine diesel engines and electrically connect them in parallel to supply required power. As for fuel, there is city gas that can always supply gas only by piping. Further, as an emergency, LPG (liquefied petroleum gas), which can easily transport fuel with a cylinder and has particularly small deterioration due to aging, may be used. There is a system in which a generator is driven by such a gas engine. According to this, since there are more hydrogen atoms in the fuel molecule than gasoline and light oil, it emits less carbon dioxide, which is one of the causes of warming, and it is quieter and easier to start in cold weather than diesel engines. Has the advantage of being good.

Japanese Unexamined Patent Publication No. 2-262846 Japanese Unexamined Patent Publication No. 9-195811 JP-A-2018-204594

By the way, a gas engine, which is a positive displacement piston engine, has low thermal efficiency when the load is small when the gas engine is operated at a constant rotation speed and air-fuel ratio. At idling, the thermal efficiency is zero. That is, the engine consumes only fuel without doing any work to the outside.

On the other hand, in the spark ignition engine, the volume of one cylinder is limited due to the law of flame propagation. By the way, the limitation is relaxed in the compression ignition diesel engine, and one diesel engine for ships can generate an output of tens of thousands of kilowatts. However, with a gas engine, it is several hundred kilowatts. The electric load of individual power generation is about zero to 500 kW. Moreover, one engine may not be able to supply the maximum required power. In this case, there is no choice but to arrange the engine generators in which the engine and the generator are paired in parallel to take out the electric power.

If the required power is small, a large engine will be operated at low output. In this case, the throttle opening becomes small and the thermal efficiency deteriorates. Therefore, if the required power is small, the output per engine should be large with as few engines as possible. Then, when the required power becomes large, it is preferable to operate the engine of the corresponding radix. However, when the required electric load suddenly increases, another engine must be started in a hurry, but the engine requires warm-up time.

In a cold engine, combustion in the cylinder is poor and friction loss is large, so it is difficult to output output, and the gap between the piston and cylinder is large, and white smoke is generated due to the oil rising into the combustion chamber. There are harmful effects such as increased oil consumption.

In Patent Document 1 (Japanese Patent Laid-Open No. 2-262846), Patent Document 2 (Japanese Patent Laid-Open No. 9-195811) and Patent Document 3 (Japanese Patent Laid-Open No. 2018-204594), a plurality of engines and generators are arranged in parallel. There are some, but all the engines are always in operation, and the operation of the engines does not change according to the increase or decrease in the required power.

As described above, in the power generation system using a gas engine, each gas engine and generator operate separately depending on the increase or decrease in the power consumption, and a plurality of gas engines are in operation and stopped. There is. Further, even when the gas engine is in operation, there is a difference in the number of revolutions, and the usage conditions are also different. As a result, the plurality of gas engines vary in the time of failure. Under such circumstances, it is an important requirement that maintenance and management of gas engines, generators and their associated parts be easy. Therefore, an object of the present invention (a technical problem to be solved) is a gas engine power generation system that facilitates maintenance and management in a power generation system including a plurality of gas engines and generators and can always operate in an optimum state. Is to provide.

Therefore, as a result of diligent research to solve the above problems, the inventor has introduced the invention of claim 1 to a gas engine, an AC generator, a cooling system unit, an engine control unit, and an AC / DC inverter. A power generation component composed of The power generation unit is configured to be able to generate power independently, and a plurality of the power generation units are electrically connected in parallel, and the total operation and stop of the power generation unit and the magnitude of the generated power are controlled by the total control unit. , The DC power from each power generation unit is added up and converted into AC power, which is supplied to the load side as AC power, and the rotation speed of the gas engine is constant against the power generation load of the gas engine. The throttle opening is adjusted so as to be controlled by the engine control unit, and a plurality of the respective power generation units are provided in the installed unit rack, and when there is a problem with the power generation unit, the said It is configured so that it can be replaced for each power generation unit, and the housing is provided with a frame in which the gas engine and the alternator are installed, and the frame in which they are installed can be freely taken in and out of the housing. The above-mentioned problem was solved by adopting a gas engine power generation system characterized by being configured in.

According to the invention of claim 2, in the gas engine power generation system according to claim 1, fuel supply in all the power generation units is performed by a fuel pipe provided outside the power generation unit. By making it a system, the above-mentioned problems were solved. The invention of claim 3 is characterized in that, in the gas engine power generation system according to claim 1 or 2, the exhaust of all the power generation units is connected to an exhaust duct provided outside the power generation unit. The above problem was solved by adopting a gas engine power generation system.

According to the invention of claim 4, in the gas engine power generation system according to any one of claims 1, 2 or 3, a guide rail is provided on the floor plate of the housing, and the gas engine and the alternator are provided. The problem was solved by providing a gas engine power generation system characterized in that a guide piece that is movable along the guide rail is provided on the lower surface side of the bottom plate of the frame in which the is installed. The invention of claim 5 is the gas engine power generation system according to any one of claims 1, 2, 3 or 4, wherein the housing has an upper and lower two-story structure via a middle plate, and the lower chamber portion is described. The problem was solved by adopting a gas engine power generation system characterized in that a gas engine and the alternator are housed and electrical components are housed in the upper chamber.

According to the invention of claim 6, in the gas engine power generation system according to any one of claims 1, 2, 3, 4 or 5, a plurality of the power generation units are arranged in two upper and lower stages in the unit rack. The above-mentioned problem was solved by adopting a gas engine power generation system characterized by the above. According to the invention of claim 7, in the gas engine power generation system according to any one of claims 1, 2, 3, 4, 5 or 6, a plurality of the power generation units are arranged in three to seven stages in the unit rack. The above-mentioned problem was solved by adopting a gas engine power generation system characterized by being arranged in. According to the invention of claim 8, in the gas engine power generation system according to any one of claims 1, 2, 3, 4, 5, 6 or 7, the unit rack has a plurality of the power generation units in eight stages or more. The above-mentioned problems are solved by adopting a gas engine power generation system characterized in that it is arranged in a dozen or so stages.

In the invention of claim 1, since each of the plurality of power generation devices is made into a plurality of units, maintenance management can be facilitated, and when one unit has a defect, the entire unit can be replaced. Further, in the present invention, the entire operation and stop of the power generation unit and the magnitude of the generated power can be efficiently and stably supplied by the configuration managed by the total control unit. Further, in the invention of claim 1, the unit rack is particularly suitable for a narrow machine room because the power generation units can be efficiently arranged by installing the plurality of power generation units.

In the invention of claim 2, the system configuration can be simplified by supplying fuel to all the power generation units through fuel pipes provided outside the power generation unit. In the invention of claim 3, the system configuration can be simplified by connecting to an exhaust duct provided outside the power generation unit.

In the inventions of claims 4 and 5, maintenance and management of the power generation unit and its system can be facilitated. In the invention of claim 6, since a plurality of the power generation units are arranged in two upper and lower stages in the unit rack, the storage efficiency can be further improved.

In the invention of claim 7 or the invention of claim 8, since the unit racks are arranged in 3 to 7 stages or 8 to a dozen stages, the power generation unit is provided in each rack portion for operation. If this is done, a relatively large capacity of power generation can be obtained, and it can be used as an important power plant. This has the advantage that a CO2 emission effect can also be obtained.

It is a schematic diagram which shows the structure of this invention. (A) is an enlarged view of a power generation unit, and (B) is a schematic view showing a state in which a plurality of power generation units are installed in a machine room. (A) is an exploded perspective view of the housing of the power generation unit, and (B) is a perspective view of a frame in which the gas engine of the power generation unit and its peripheral devices are installed. (A) is a schematic side view of the vertical section of the power generation unit, and (B) is a schematic side view of the vertical section of the power generation unit. (A) is a perspective view of a main part in a state where a plurality of power generation units are arranged in parallel, and (B) is a perspective view of a main part in a state where a plurality of power generation units are installed in a unit rack having two upper and lower stages. (A) is a perspective view showing a state in which a frame on which a gas engine, an AC generator, etc. is installed is pulled out from the housing of the power generation unit onto a pallet, and (B) is a perspective view in a state in which the frame is mounted on the pallet. .. (A) is a perspective view of the main part in a state where a large number of power generation units are installed in a unit rack having five stages in the vertical direction, and (B) is a perspective view of the main part in a state where the five stages of (A) are arranged in parallel. C) is a view taken along the line Y1-Y1 of (B). (A) is a perspective view of a main part in a state where a large number of power generation units are installed in a unit rack having eight stages in the vertical direction, and (B) is a perspective view of a main part in a state where eight stages of (A) are arranged in parallel. C) is a view taken along the line Y2-Y2 of (B). (A) is a plan view of a unit rack group in which a large number of power generation units are arranged in parallel in multiple stages in the vertical direction and installed at appropriate intervals, and (B) is a plan view of the unit rack group in (A). It is a top view prepared as 10 groups. It is a block diagram which shows the structure of this invention, and is the schematic diagram which used a large number of power generation units (including an alternator). It is a block diagram which shows the structure of another embodiment of this invention, and is the schematic diagram which used a large number of power generation units (including a DC generator). (A) is a table showing the engine speed and combustion rate characteristics during engine operation with the throttle opening of the engine as a parameter, and (B) is the throttle opening and combustion at the engine speed with good combustion rate in (A). It is a table which shows the rate characteristic.

Embodiments of the present invention will be described with reference to the drawings. The overall configuration of the present invention will be described with reference to FIG. The present invention includes a plurality of power generation units A, a total control unit (TCU) 81, a DC / AC inverter 82, a fuel pipe 91, an exhaust collecting pipe 92, and a power cable 93. Further, the power generation unit A includes a gas engine 2, an AC generator 51, an intake system unit 3, an exhaust system unit 4, an engine control unit (ECU) 61, an AC / DC inverter 52, and the like. See FIGS. 1 and 2 (A)].

A plurality of power generation units A are provided, and the plurality of power generation units A, A, ... Share a common power cable 85 and are electrically arranged in parallel. Further, the plurality of power generation units A, A, ... Are connected by sharing a common fuel pipe 83 and an exhaust collecting pipe (which may be referred to as an exhaust duct) 84. That is, the power generation units A, A, ... Share the common fuel pipe 83, the exhaust collecting pipe (which may be referred to as the exhaust duct) 84, and the power cable 85 outside each other, and are in parallel with each other. It is connected or connected.

Then, these plurality of power generation units A, A, ... Are controlled by the total control unit (TCU), and the DC power from each of the power generation units A, A, ... Is added up and converted into AC power, and the request is made. It supplies the generated power to the load side. These are installed in the machine room M [see FIG. 2 (B)].

First, the power generation unit A will be described. In the power generation unit A, the gas engine 2, the alternator 51 connected to the gas engine 2, and the essential parts for operating the gas engine 2 are housed in the housing 1 [see FIG. 2 (A)]. The essential parts for the operation of the gas engine 2 are mainly an engine control unit (ECU) 61, a radiator 55a, a cooling fan 55b, a battery 53, and the like.

The housing 1 is a substantially rectangular parallelepiped storage box, and includes a main body portion 11 and a cover portion 12. The main body 11 has an engine chamber 11a at the lower portion and an electrical component chamber 11b at the upper portion. The engine chamber 11a and the electrical component chamber 11b are separated by a middle plate 11c [see FIG. 3 (A)]. The gas engine 2, the alternator 51, and the charger 54 are housed in the engine chamber 11a (see FIG. 4). The AC / DC inverter 52, the engine control unit (ECU) 61, and related electrical components are housed in the electrical component room 11b. The front side of the main body 11 has an opening, and for maintenance and management, electrical components such as the gas engine 2 and the engine control unit (ECU) 61 can be taken in and out from this opening, and maintenance and management are efficient. Can be done.

The cover portion 12 serves to close the opening of the main body portion 11, and both are joined by a fixing tool such as a bolt or a screw. A louver 13 is provided on the main body portion 11 and the cover portion 12 [see FIG. 3 (A)]. The louver 13 serves as a ventilation port and also serves as a heat release.

The gas engine 2, the alternator 51, and the charger 54 housed in the engine chamber 11a are mounted so as to be housed in the frame 7 [see FIGS. 3 (B) and 4]. The frame 7 has a skeleton structure and is formed as a substantially rectangular parallelepiped frame by a plurality of frame members 71, 71, ... With an L-shaped cross section. Specifically, 12 frame members 71 are used. The frame members 71 are connected and fixed by welding or the like. A frame floor plate 72 is provided at the bottom of the frame 7, and a gas engine 2, an alternator 51, and a charger 54 are arranged on the upper surface of the frame floor plate 72 [see FIG. 3 (A)].

Twelve independent frame members 71 may be joined by welding, or a part of the frame member 71 may be bent to reduce the number of frame members 71 and the welding points. .. Guide pieces 73 are attached below the frame 7 and at both front and rear locations on one side in the width direction. The guide piece 73 is firmly attached to the lower part of the frame 7 by welding or fixing means such as bolts [see FIGS. 3 (B) and 4 (A)]. The guide piece 73 is formed as a substantially gate-shaped or bifurcated block material, and a reverse concave insertion portion 73a is formed at the lower portion.

Further, a guide rail 14 is provided on the main body floor plate 11d of the main body portion 11 of the housing A. The guide rail 14 of the frame 7 is inserted and fitted into the inserted portion 73a of the guide piece 73, and the guide piece 73 slides along the guide rail 14 [see FIG. 4 (A)]. .. Then, the frame 7 moves along the guide rail 14 into the engine chamber 11a of the main body 11 of the housing 1, is inserted to a predetermined position, and is fixed. At this time, the frame 7 can be installed at a predetermined position on the main body floor plate 11d of the main body 11 due to the structure in which the guide pieces 73 and 33 on both sides of the frame 7 in the front-rear direction and the guide rail 14 of the main body 11 are fitted. can.

Then, the frame 7 is placed on the main body floor plate 11d of the main body 11 while being restricted from moving in the left-right direction by fitting the guide piece 73 and the guide rail 14 of the main body 11, and moves by vibration to a predetermined position. Prevents the rails from slipping. Further, the gas engine 2 and the alternator 51 are supported by the frame 7 via the anti-vibration rubber 74. Further, the parts installed on the main body floor plate 11d such as the charger 54 may be supported by the anti-vibration rubber 74 if necessary.

The guide rail 14 is provided with a stopper 14a at the rear end, that is, at the inner end of the main body 11 of the housing 1. When the frame 7 is stored in the main body 11 of the housing 1, when the guide piece 73 moves along the guide rail 14, when the frame 7 reaches a predetermined position of the main body 11, the back of the frame 7 is reached. The guide piece 73 on the side comes into contact with the stopper 14a so that the frame 7 can be stopped at an appropriate position in the housing 1 [see FIG. 4 (B)].

In this way, the position of the frame 7 in the left-right direction is determined by the guide piece 73 and the guide rail 14, and the depth direction of the housing 1 is determined by the stopper 14a. Fix it. The frame floor plate 72 of the frame 7 is provided on the entire lower surface of the frame 7, but is not limited to such a configuration, and may be configured to be partially bridged in a girder shape.

The gas engine 2 includes an intake system unit 3 and an exhaust system unit 4 [see FIGS. 1 and 2 (A)]. Further, the intake system unit 3 and the exhaust system unit 4 are provided with an intake manifold 31 and an exhaust manifold 41, the intake manifold 31 is provided with a mixer 32, and an internal fuel supply pipe 33 is continuously provided. The internal fuel supply pipe 33 projects to the outside of the housing 1, and a shutoff valve 211c is provided at a portion protruding to the outside of the housing 1 [see FIG. 2 (A)].

The exhaust manifold 41 is provided with a three-way catalyst 42 and a muffler 43, and an internal exhaust pipe 44 is continuously provided. The internal exhaust pipe 44 projects to the outside of the housing 1, and an intake joint portion 34 is provided at a portion projecting to the outside of the housing 1 [see FIG. 2 (A)].

Further, in the AC generator 51, the output electric wire 57 is continuous with the AC / DC inverter 52. The output electric wire 57 projects to the outside of the housing 1, and a connector 57a is provided at the tip of the protruding portion [see FIG. 4 (B)]. Sensors such as a water temperature sensor 63, a crank sensor 64, and an O2 sensor 62 are incorporated in the housing 1. In addition, a radiator, a cooling fan 55b, etc. are provided [see FIG. 2 (A)].

As described above, since the power generation units A have exactly the same configuration, compatibility can be achieved between the power generation units A. Even if a problem occurs in any of the power generation units A, it can be recovered in a short time with a minimum decrease in power generation capacity by replacing the power generation unit A with a new one.

The AC generator 51 is driven by the operation of the gas engine 2, the AC generated by the AC generator 51 is converted into a DC of a predetermined voltage by the AC / DC inverter 52, and the power generated by the DC current is output. Components necessary for operating the gas engine 2, for example, an engine control unit (ECU) 61, a battery 53, a radiator 55a, a cooling fan 55b, a ventilation fan 55c in the housing, and the like are housed in the housing 1 to form each power generation unit A. doing.

As a result, if fuel is supplied to each power generation unit A, each power generation unit A can independently operate the gas engine 2 to generate power. The operation of each power generation unit A is performed by a command from the total control unit (TCU) 81, which is provided independently of all power generation units A, to the engine control unit (ECU) 61 in the power generation unit A.

The DC power from each power generation unit A is collected in a DC / AC converter 82 provided separately from all power generation units A, and is supplied to the load side as AC of a predetermined voltage and frequency [FIG. 1]. , See FIG. 2 (A)]. The electric output assigned to each power generation unit A by the DC / AC converter 82 is monitored by an ammeter or a voltmeter.

When the DC / AC converter 82 tries to output a predetermined voltage, the engine control unit (ECU) 61 determines that the current becomes small and the power allocated by the total control unit (TCU) 81 is not output, and the throttle actuator Opens the throttle. This increases the torque of the engine. In this way, the torque is increased while keeping the engine speed constant (for example, 2400 rpm), and the output of the engine proportional to (rotation speed) × (torque) is increased.

Further, if the DC / AC converter 82 is set to output a predetermined current value, the output of the gas engine 2 is small and does not reach the predetermined rotation speed, and the current or voltage measured by an ammeter or a voltmeter becomes It gets lower. In order to recover this, the DC / AC converter 82 sends a signal to the throttle actuator to open the throttle. As a result, the rotation speed of the gas engine 2 is configured to be the above-mentioned constant rotation speed.

In this way, each power generation unit A can generate power independently, and the DC power (DC power added in parallel) allocated by the total control unit (TCU) 81 is collectively converted to AC. The DC / AC inverter 82 transmits AC power of a predetermined voltage. Each power generation unit A is connected to the fuel pipe 83, the DC output power cable 85, and the signal line 86 from the total control unit (TCU) 81 of the signal line 86 from the TCU.

The exhaust gas discharged from each gas engine 2 through the three-way catalyst 42 and the muffler 43 may be individually discharged directly to the atmosphere, or collected by an exhaust collecting pipe (exhaust duct) 84 and discharged to the atmosphere. good. An O2 sensor 62 is attached to the exhaust manifold 41, and this signal causes the engine control unit (ECU) 61 to have an air-fuel ratio of 15.6 when the fuel is propane C3H8 and 16.8 when the fuel is city gas 13A. The low pressure control valve 56 is controlled so as to be. In order to effectively operate the three-way catalyst 42 in order to detoxify HC, CO, and NOx at the same time, it is essential to set the air-fuel ratio of the engine to the stoichiometric air-fuel ratio.

The function of the engine control unit (ECU) 61 is to adjust the throttle opening so that the engine rotation speed detected by the crank sensor 64 becomes a predetermined rotation speed (for example, 2400 rpm is constant), and the air-fuel ratio detected by the O2 sensor 62 is The low-pressure regulating valve 56 is controlled and the ignition timing is controlled so that the stoichiometric air-fuel ratio is obtained, the gas engine 2 is started and stopped, and the electric cooling fan 55b and the in-housing ventilation fan 55c are controlled. Here, the engine is started by the engine control unit (ECU) 61, which receives a command from the total control unit (TCU) 81, with the starter relay 65 turned on and the starter motor 58.

The total control unit (TCU) 81 issues a direct instruction to the AC / DC inverter 52 of each power generation unit A to allocate the required power generation to each power generation unit. As a result, each engine 2 generates the torque of the engine that drives the alternator 51 so that the rotation speed becomes constant against the load of power generation. The DC power of the same voltage output by each power generation unit is converted into AC power of a predetermined voltage and a predetermined frequency by the DC / AC inverter 82 and supplied to the load side.

The electric power required for each gas engine 2 is supplied from the battery 53. The battery 53 is constantly charged by the charger 54. Here, when a DC generator is used instead of the AC generator 22, the AC / DC inverter 52 becomes unnecessary if the current of the field coil is controlled so as to generate electric power of the same voltage.

A case where the power generation units are arranged in parallel will be described with reference to FIG. The power cable 85, the signal line 86, the fuel pipe 83, and the collective exhaust pipe 23 connect each power generation unit. In this figure, the total control unit (TCU) 81 and the DC / AC inverter 82 are an example of being housed in one case (see FIG. 2).

FIG. 5B is a three-dimensional power generation device in which each power generation unit is housed in a unit rack 9 in two upper and lower stages. Further, by connecting the unit racks 9, a large amount of electric power can be supplied in a narrow space. Specifically, when each power generation unit is 50 kW, in the case of a gas engine, one unit has a width of 1.7 m, a depth of 0.8 m, and a height of about 1.3 m, so the land area is 10 m x 10 m. However, if the unit rack 9 having three layers (in the case of two layers in FIG. 3) is used, the power generation unit A can accommodate 75 units with a margin. The power generated by this is 50 kW x 75 units = 3750 kW, that is, 3.75 MW.

Next, a method of operating the gas engine 2 at a heat-efficient rotation speed and torque will be described with reference to FIGS. 12A and 12B. The fuel consumption rate (g / kW · h) on the vertical axis refers to how many grams of fuel are consumed per hour to generate 1 kW when the engine is running. If this is large, fuel consumption will be large and thermal efficiency will be poor. In the case of LPG, the calorific value per 1 m3 (1.96 kg by mass) is 90.7 Mj (90700 kj). For example, let's find the thermal efficiency when the fuel consumption rate is 200 g / kW · h.

The heat energy of fuel consumed per hour is
(90700kj / 1.96kg) x 0.2kg = 9255kj ... (1)
On the other hand, the work done in one hour with this is 1kj / s x 3600s = 3600kj ... (2)
Therefore, the thermal efficiency is (2) / (1) = 0.389, that is, 38.9%.

The throttle opening degree in FIG. 12B is a value obtained by dividing the throttle opening into four equal parts, with fully closed as zero and fully open as 1 (= 4/4). The fuel consumption rate becomes a curve that is convex downward with respect to the engine speed. In the example of the gas engine designed for power generation, the fuel consumption rate is the minimum when the engine speed is 2400 rpm for each throttle opening.

If the air-fuel ratio is constant, it can be seen that the larger the throttle opening, the smaller the fuel consumption rate.
This is because when the engine speed is low, the flow of the air-fuel mixture in the cylinder is small, so combustion is poor, and when the engine speed is high, friction loss increases, so even with the same throttle opening, the fuel chapter ratio is minimized. There are numbers. Operating at this engine speed is advantageous for improving thermal efficiency.

Further, as shown in FIG. 12B, when the throttle opening is increased, the fuel consumption rate is reduced because the rotation speed is the same and the friction loss is almost the same, but the work done by the piston is increased, so that it is relative. This is because the ratio of friction loss becomes smaller. The net work of the piston minus the friction loss is increased. That is, fuel consumption per work is reduced.

If the required power is small, the throttle is opened with a small number of engines to increase the torque. When the required power becomes larger, the engine control unit (ECU) 61 of each power generation unit operates the engine by the signal from the total control unit (TCU) 81. In addition, in order to cope with a sudden increase in load, it is better to operate each engine with an opening slightly smaller than the throttle opening of 4/4 (fully open) so as to have a margin.

In this way, a plurality of power generation units are selectively operated so that the thermal efficiency of the engine is the best for supplying the required power so that the operation is not biased. Again, it is the total control unit (TCU) 81 that gives instructions for economic operation to each power generation unit A.

As described above, since the power generation units have exactly the same configuration, compatibility can be achieved between the power generation units A. Even if a problem occurs in any of the power generation units, it can be recovered in a short time with a minimum decrease in power generation capacity by replacing the unit. Of course, if a spare power generation unit is connected from the beginning, it is possible to avoid a power drop in the unlikely event.

Further, if even one engine is running, the alternator 51 can be used as the starter motor 58 when starting another engine. In this case, the AC generator 51 drives the gas engine 2 with the electric power generated by the gas engine 2 operating by directly outputting a signal from the total control unit (TCU) 81.

The total control unit (TCU) 81 performs operations such as ignition and throttle opening control necessary for the operation of the gas engine 2 on the engine control unit (ECU) 61 of the gas engine 2 which is started at the same time. By using the generator for starting, the starter motor 58 and the starter relay 65 become unnecessary.

In the present invention, devices constituting a power generation system such as a gas engine 2, an alternator 51, and an engine control unit (ECU) 61 are installed in a housing 1 to be unitized, and a plurality of these are provided as a power generation unit A. To generate electricity. If the equipment included in any of the power generation units A malfunctions or breaks down due to the unitization in this way, the equipment belonging to each power generation unit A can be repaired or replaced, and maintenance management can be performed. Work efficiency can be improved.

In particular, a structure in which heavy equipment such as a gas engine 2 and an alternator 51 is installed in the frame 7 and the frame 7 can be freely moved in and out of the housing 1 facilitates maintenance and repair. Specifically, the cover portion 12 of the housing 1 is removed, the pallet P is arranged at the front portion of the opening of the main body portion 11, and the frame 7 dragged out from the housing 1 is placed on the pallet P as it is. It can be easily transported from the machine room M to the outside, and the efficiency of maintenance management and repair work can be improved (see FIG. 6).

FIG. 7A is a three-dimensional power generation device in which each power generation unit is housed in a unit rack 9 in five stages. Further, by connecting 20 units of the unit rack 9 in one stage, a large amount of electric power can be supplied in a narrow space. Specifically, when each power generation unit is 50 kW, in the case of a gas engine, one unit has a width of 1.7 m, a depth of 0.8 m, and a height of about 1.3 m. 100 units can be installed in a unit rack 9 having a width of about 20 m, a width of about 2 m, and a height of about 7.5 m. The power generated by this is 50 kW x 100 units = 5000 kW, that is, 5 MW.

Further, the unit racks 9 of FIG. 7 (A) are arranged in parallel (width of about 4 m) to prevent them from tipping over, and to make it easier to take out each power generation unit A from the left and right sides of both sides [FIG. 7 (C)]. It is configured. In this case, the generated power is 50 kW x 200 units = 10000 kW, that is, 10 MW. Further, as shown in FIG. 8A, the unit rack 9 is housed in eight upper and lower stages to form a three-dimensional power generation device. In this case, assuming the size of each power generation unit A as described above, 160 units can be installed in a unit rack 9 having a depth width of 20 units, a depth width of about 20 m, a width of about 2 m, and a height of about 12 m. The power generated by this is 50 kW x 160 units = 8000 kW, that is, 8 MW.

Further, the unit racks 9 of FIG. 8 (A) are arranged in parallel (width of about 4 m) to prevent them from tipping over, and to make it easier to take out each power generation unit A from the left and right sides of both sides [FIG. 8 (C)]. It is configured. In this case, the generated power is 50 kW x 320 units = 16000 kW, that is, 16 MW.

Further, what is shown in FIG. 9A is a collection of 5 sets of 9 groups of a plurality of stages of unit racks shown in FIG. 7 or 8. With this, if there are five stages, the number of power generation units A is 1000. In this case, the generated power is 50 kW x 1000 units = 50,000 kW, that is, 50 MW = 50,000 kW. With this, if there are eight stages, the number of power generation units A is 1,600. In this case, the generated power is 50 kW x 1600 units = 80,000 kW, that is, 80 MW = 80,000 kW.

Further, the group set shown in FIG. 9 (A) is further multiplied by 10. With this, if there are five stages, the number of power generation units A will be 10,000. In this case, the generated power is 50 kW x 10000 units = 500,000 kW, that is, 500 MW = 500,000 KW. With this, if there are eight stages, the number of power generation units A will be 16000. In this case, the generated power is 50 kW x 16,000 units = 800,000 kW, that is, 800 MW = 800,000 kW. It is the power plant itself that has 500,000 kW and 800,000 kW in this way.

FIG. 10 is a block diagram that can be configured as described above. In this case, in order to bundle the power generation units A to generate 500,000 kW (500 MW) of electric power, it is necessary to increase the voltage of each power generation unit A. For example, if it is 200V, it will be 250A if it is 50kW. If it is 1000V, it becomes 50A and the electric wire can be thinned. The entire DC power is output at 1000V by the AC / DC inverter 52. The parallel 1000V DC of the power generation unit A is converted into an AC of a predetermined voltage via the DC / AC inverter 82 by a command from the total control unit (TCU) 81. For example, the output is preferably a 6600V three-phase alternating current of a high-voltage line of a utility pole.

As the next means, as shown in FIG. 11, the generator of each unit is a direct current. That is, it is a DC generator 59. In this case, the force of a predetermined DC voltage is directly output without arranging an inverter in each unit. The exciting current of the DC generator of each unit is controlled by a command from the total control unit (TCU) 81 so that the voltage becomes a predetermined value, for example, 1000 V. Since there is no inverter, there is an advantage that efficiency is improved.

The following additional notes are further disclosed with respect to the above-described embodiment.

(Appendix 1)
A power generation component composed of a gas engine, a DC generator, a cooling system unit, and an engine control unit, and a housing are provided, and the power generation structure is housed in the housing and a plurality of power generation units are provided. Each of the power generation units is provided so as to be able to generate power independently, and a plurality of the power generation units are electrically connected in parallel, and the total operation and stop of the power generation units and the magnitude of the generated power are determined by the total control unit. A gas engine power generation system characterized in that the power from each of the power generation units can be added up and an appropriate AC power can be transmitted by a DC / AC inverter as an output power source.

(Appendix 2)
A power generation component including a gas engine, a DC generator, a cooling system unit, an exhaust system unit, an engine control unit, and a battery, and a housing are provided, and the power generation configuration is in the housing. It is housed and provided as a plurality of power generation units, and each of the power generation units is configured to be able to generate power independently. Is provided with a total control unit, and the total operation and stop of the power generation unit and the magnitude of the generated power are controlled by the total control unit, and an appropriate AC is used as an output power source by a DC / AC inverter. A gas engine power generation system characterized in that power can be transmitted and fuel supply in all the power generation units is performed by fuel pipes provided outside the power generation unit.

(Appendix 3)
A power generation component including a gas engine, a DC generator, a cooling system unit, an exhaust system unit, an engine control unit, and a battery, and a housing are provided, and the power generation configuration is in the housing. It is housed and provided as a plurality of power generation units, and each of the power generation units is configured to be able to generate power independently. Is provided with a total control unit, and the total operation and stop of the power generation unit and the magnitude of the generated power are controlled by the total control unit, and an appropriate AC is used as an output power source by a DC / AC inverter. While power can be transmitted, fuel supply in all the power generation units is performed by fuel pipes provided outside the power generation unit, and exhaust of all the power generation units is performed in exhaust ducts provided outside the power generation unit. A gas engine power generation system characterized by being connected.

(Appendix 4)
A power generation component including a gas engine, a DC generator, a cooling system unit, an exhaust system unit, an engine control unit, and a battery, and a housing are provided, and the power generation configuration is in the housing. It is housed and provided as a plurality of power generation units, and each of the power generation units is configured to be able to generate power independently. Is provided with a total control unit, and the total operation and stop of the power generation unit and the magnitude of the generated power are controlled by the total control unit, and an appropriate AC is used as an output power source by a DC / AC inverter. A gas engine power generation system characterized in that power can be transmitted and a unit rack is provided, wherein a plurality of the power generation units are arranged in a parallel state.

(Appendix 5)
A power generation component including a gas engine, a DC generator, a cooling system unit, an exhaust system unit, an engine control unit, and a battery, and a housing are provided, and the power generation configuration is in the housing. It is housed and provided as a plurality of power generation units, and each of the power generation units is configured to be able to generate power independently. Is provided with a total control unit, and the total operation and stop of the power generation unit and the magnitude of the generated power are managed by the total control unit, and the gas engine and the battery are housed in the housing. A gas engine power generation system characterized in that a frame is provided in which the frame is installed, and the frame is configured to be freely put in and taken out from the housing.

(Appendix 6)
It includes a power generation component including a gas engine, a DC generator, a cooling system unit, an exhaust system unit, an engine control unit, and a battery, and a housing, and the power generation configuration is in the housing. It is housed and provided as a plurality of power generation units, and each power generation unit is configured to be able to generate power independently, and the plurality of power generation units are connected in parallel by electrical wiring provided outside the power generation unit. Is provided with a total control unit, and the total operation and stop of the power generation unit and the magnitude of the generated power are managed by the total control unit, and the gas engine and the battery are housed in the housing. Is provided, the frame is configured to be freely accessible from the housing, a guide rail is provided on the floor plate of the housing, and the guide rail is provided on the lower surface side of the bottom plate of the frame. A gas engine power generation system characterized by being provided with a guide piece that can be moved along.

(Appendix 7)
A power generation component including a gas engine, a DC generator, a cooling system unit, an exhaust system unit, an engine control unit, and a battery, and a housing are provided, and the power generation configuration is in the housing. It is housed and provided as a plurality of power generation units, and each of the power generation units is configured to be able to generate power independently. Is provided with a total control unit, and the total operation and stop of the power generation unit and the magnitude of the generated power are controlled by the total control unit, and an appropriate AC is used as an output power source by a DC / AC inverter. A gas engine characterized in that power can be transmitted, the housing has an upper and lower two-story structure via a middle plate, the frame is housed in the lower chamber part, and electrical components are stored in the upper chamber part. Power generation system.

(Appendix 8)
A power generation component including a gas engine, a DC generator, a cooling system unit, an exhaust system unit, an engine control unit, and a battery, and a housing are provided, and the power generation configuration is in the housing. It is housed and provided as a plurality of power generation units, and each of the power generation units is configured to be able to generate power independently. Is provided with a total control unit, and the total operation and stop of the power generation unit and the magnitude of the generated power are controlled by the total control unit, and an appropriate AC is used as an output power source by a DC / AC inverter. A unit rack is provided so that power can be transmitted, and the unit rack comprises a plurality of the power generation units arranged in parallel, and the unit rack has a plurality of the power generation units arranged in two upper and lower stages. A gas engine power generation system featuring.

(Appendix 9)
A power generation component including a gas engine, a DC generator, a cooling system unit, an exhaust system unit, an engine control unit, and a battery, and a housing are provided, and the power generation configuration is in the housing. It is housed and provided as a plurality of power generation units, and each of the power generation units is configured to be able to generate power independently. Is provided with a total control unit, and the total operation and stop of the power generation unit and the magnitude of the generated power are controlled by the total control unit, and an appropriate AC is used as an output power source by a DC / AC inverter. A unit rack is provided as well as being able to transmit power. The unit rack has a plurality of the power generation units arranged in parallel, and the unit rack has a plurality of the power generation units arranged in three to seven stages. A gas engine power generation system characterized by becoming.

(Appendix 10)
A power generation component including a gas engine, a DC generator, a cooling system unit, an exhaust system unit, an engine control unit, and a battery, and a housing are provided, and the power generation configuration is in the housing. It is housed and provided as a plurality of power generation units, and each of the power generation units is configured to be able to generate power independently. Is provided with a total control unit, and the total operation and stop of the power generation unit and the magnitude of the generated power are controlled by the total control unit, and an appropriate AC is used as an output power source by a DC / AC inverter. A unit rack is provided as well as being able to transmit power. The unit rack has a plurality of the power generation units arranged in parallel, and the unit rack has a plurality of the power generation units arranged in eight to a dozen stages. A gas engine power generation system characterized by being

A ... Power generation unit, 1 ... Housing, 2 ... Gas engine, 4 ... Exhaust system,
51 ... AC generator, 52 ... AC / DC inverter, 53 ... Battery,
55 ... Cooling system unit, 61 ... Engine control unit (ECU),
81 ... Total control unit (TCU), 83 ... Fuel piping, 84 ... Exhaust collecting pipe,
85 ... power cable, 9 ... unit rack.

Claims (8)

It includes a power generation component composed of a gas engine, an AC generator, a cooling system unit, an engine control unit, and an AC / DC inverter, and a housing, and the power generation component is housed in the housing. As a power generation unit, a plurality of the power generation units are provided with the same configuration and with compatibility, and each power generation unit is configured to be able to generate electricity independently, and the plurality of power generation units are electrically connected in parallel to each other. The total operation and stop of the power generation unit and the magnitude of the generated power are managed by the total control unit, and the DC power from each of the power generation units is added up and converted into AC power, which is supplied to the load side as AC power. At the same time, the throttle opening is adjusted so that the rotation speed of the gas engine becomes constant against the load of power generation of the gas engine, and the engine control unit controls the power generation. The unit is installed in the installed unit rack,
When there is a problem with the power generation unit, it is configured so that it can be replaced for each power generation unit, and the housing is provided with a frame in which the gas engine and the alternator are installed, and these are installed. A gas engine power generation system characterized in that the frame is configured to be freely put in and taken out from the housing. The gas engine power generation system according to claim 1, wherein fuel supply in all the power generation units is performed by a fuel pipe provided outside the power generation unit. The gas engine power generation system according to claim 1 or 2, wherein the exhaust of all the power generation units is connected to an exhaust duct provided outside the power generation unit. In the gas engine power generation system according to any one of claims 1, 2 or 3, a guide rail is provided on the floor plate of the housing, and the bottom plate of the frame on which the gas engine and the alternator are installed. A gas engine power generation system characterized in that a guide piece that is movable along the guide rail is provided on the lower surface side. In the gas engine power generation system according to any one of claims 1, 2, 3 or 4, the housing has an upper and lower two-story structure via a middle plate, and the gas engine and the alternator are in the lower chamber portion. A gas engine power generation system that is characterized by the fact that is stored in the upper chamber and electrical components are stored in the upper chamber. The gas engine power generation system according to any one of claims 1, 2, 3, 4 or 5, wherein a plurality of the power generation units are arranged in two upper and lower stages in the unit rack. Engine power generation system. In the gas engine power generation system according to any one of claims 1, 2, 3, 4, 5 or 6, a plurality of the power generation units are arranged in three to seven stages in the unit rack. Characterized gas engine power generation system. In the gas engine power generation system according to any one of claims 1, 2, 3, 4, 5, 6 or 7, a plurality of the power generation units are arranged in eight to a dozen stages in the unit rack. A gas engine power generation system characterized by becoming.

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