KR102020942B1 - Gas engine generation system and control method thereof - Google Patents

Abstract

According to an aspect of the present invention, a gas engine power generation system comprises: a gas engine; a power generator for generating power in response to the operation of the gas engine; a power converting device for converting and outputting the power generated by the power generator; a sensor unit including a pressure sensor for sensing the pressure of the gas engine; and a control unit determining an overheat state of the power generator based on pressure data of the gas engine to be sensed, and controlling the gas engine and the power generator. Accordingly, the overheating state of the power generator can be determined and operated stably.

Description

Gas engine generation system and control method thereof

The present invention relates to a gas engine power generation system and a control method thereof. More particularly, the present invention relates to a gas engine power generation system and a control method thereof capable of stably operating and overheating a generator.

In general, a power generation system refers to a system that generates electric power from a predetermined energy source, and a cogeneration system refers to a system that simultaneously generates power and heat from one energy source.

For example, in the power generation system, the cogeneration system may drive electricity to generate electric power and provide it to the electric power demand. In addition, the cogeneration system generates power by driving a generator and uses heat generated when the generator is driven. The cogeneration system supplies power generated by the generator to lighting or various electric devices in a building where the generator is installed, The generated heat can be provided to heat demands, such as a hot water supply part.

On the other hand, an increase in the temperature of the generator that plays a direct role in power production can lead to a decrease in power generation efficiency. In addition, if the generator overheats above a certain level, there is a risk that a serious safety accident may occur.

Therefore, methods for cooling the generator or detecting an overheating state of the generator have been proposed.

For example, the prior art 1 (Korean Patent Publication No. 10-1209428, date of registration December 12, 2012) is used to diagnose the occurrence and degree of overheating inside the generator using an organic compound sensor (VOC sensor) A method and apparatus are disclosed.

Prior art 1 detects organic compounds (decomposition products) generated by decomposition of epoxy, enamel, paint, varnish, insulating material, etc. in the surroundings when localized high heat is generated due to an abnormality in a generator in operation. Diagnosing the extent of overheating inside the generator and its degree.

In addition, the prior art 1 is a method of detecting gaseous organic compounds rather than particulate matter detection methods, in order to remove inflow water and oil which is a cause of frequent malfunctions in the particulate matter detection device (part of circulating hydrogen gas). The cooling fins are installed in the flow path alternately up and down, and the sample gas flows up and down to cool down, so that condensable substances (oil and water) are attached and removed.

On the other hand, the prior art 1, the generator overheating should be used as an organic compound detection sensor, which is a separate measurement equipment, it is possible to measure and determine.

Therefore, the prior art 1 has a problem in that it is possible to determine the temperature state of the generator only by having a separate detection sensor and equipment irrelevant to the power generation process.

Therefore, there is a need for a method capable of effectively determining the overheat state of the generator only by the configuration included in the generator system without adding a separate dedicated sensor and device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas engine power generation system and a method of controlling the same, capable of stably operating and overheating a generator.

It is an object of the present invention to provide a gas engine power generation system and a method of controlling the same, which are effective in terms of economy and stability by determining an overheat state of a generator without adding a dedicated sensor.

It is an object of the present invention to provide a gas engine power generation system and a control method thereof capable of accurately determining overheating of a generator and failure of a generator cooling system.

In order to achieve the above or another object, a gas engine power generation system according to an aspect of the present invention, a gas engine, a generator for producing power in accordance with the operation of the gas engine, a power converter for converting and outputting the power produced by the generator, By including a sensor unit including a pressure sensor for sensing the pressure of the gas engine, and a control unit for determining the overheat state of the generator based on the pressure data of the sensed gas engine, and controlling the driving of the gas engine and the generator, The overheating state of the generator can be determined and operated stably.

In order to achieve the above or another object, a control method of a gas engine power generation system according to an aspect of the present invention may include: driving a gas engine, based on suction pressure data sensed by the gas engine, and power according to driving of the gas engine. Firstly determining an overheating state of the generator that produces the second, and if it is determined that the generator is overheated in the first determination step, secondly determining the overheating state of the generator based on suction pressure data sensed by the gas engine; And, if it is determined that the generator is overheated in the second determination step, based on the suction pressure data sensed by the gas engine, it may include a third step of determining the overheat state of the generator.

According to at least one of the embodiments of the present invention, it is possible to determine the overheat state of the generator and to operate stably.

In addition, according to at least one of the embodiments of the present invention, it is possible to provide a gas engine power generation system and a control method thereof that are effective in terms of economy and stability by determining the overheat state of the generator, without the addition of a dedicated sensor.

In addition, according to at least one of the embodiments of the present invention, it is possible to accurately determine the overheating of the generator, the failure of the generator cooling system.

On the other hand, various other effects will be disclosed directly or implicitly in the detailed description according to the embodiment of the present invention to be described later.

1 is a conceptual diagram of a gas engine power generation system according to an embodiment of the present invention.
2 is an internal block diagram of a main configuration of a gas engine power generation system according to an embodiment of the present invention.
3 is a flowchart illustrating a control method of a gas engine power generation system according to an exemplary embodiment of the present invention.
4 is a flowchart illustrating a control method of a gas engine power generation system according to an exemplary embodiment of the present invention.
5 and 6 are views referred to in the description of the gas engine power generation system and control method thereof according to an embodiment of the present invention.

Hereinafter, with reference to the drawings will be described in detail the present invention. In the drawings, illustrations of parts not related to the description are omitted in order to clearly and briefly describe the present invention, and the same reference numerals are used for the same or extremely similar parts throughout the specification.

The suffixes "module" and "unit" for components used in the following description are merely given in consideration of ease of preparation of the present specification, and do not impart any particular meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably.

In this application, the terms "comprises" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude, in advance, the existence or the possibility of adding numbers, steps, operations, components, parts, or combinations thereof.

1 is a conceptual diagram of a gas engine power generation system according to an embodiment of the present invention, Figure 2 is an internal block diagram of the main configuration of the gas engine power generation system according to an embodiment of the present invention.

1 and 2, a gas engine power generation system 100 according to an embodiment of the present invention includes a gas engine 110 and a generator 120 that generates electric power in accordance with driving of the gas engine 110. And, and may include a power converter 130 for converting and outputting the power produced by the generator 120.

The gas engine 110 may drive the generator 120 by driving gas as a raw material. The generator 120 may include a rotor connected to an output shaft of the gas engine 110 to generate power when the output shaft is rotated, and output the generated power to the power converter 130.

The present invention relates to a gas engine power generation system for producing electric power with a gas engine, the gas engine power generation system can supply power if gas is supplied even without electricity, there is an advantage in the independent power generation configuration.

In some cases, the gas engine power generation system according to an embodiment of the present invention may be a cogeneration system.

For example, the gas engine power generation system may generate power and heat through fuel, supply the generated power to lighting or home appliances, which are power consumption devices, and transmit the generated heat to the heat demand.

The heat demand source is a hot water supply unit (not shown) that receives the heat generated from the gas engine 110 and supplies hot water to the building, or an air conditioner that receives the heat generated by the gas engine 110 to air condition the building. And the like.

The gas engine 110 may be connected to an intake line and an exhaust line to generate power by combustion of the mixer. In addition, the mixer supplied to the gas engine 110 through the intake line may be discharged as exhaust gas through the exhaust line after combustion in the gas engine 110.

The gas engine 110 includes a cylinder head (not shown) in which the mixer burns, an intake manifold (not shown) for flowing the mixer into the cylinder head (not shown), and an exhaust for flowing the burned exhaust gas to the exhaust line. May include a manifold (not shown).

In the intake line, a mixer in which fuel is mixed with air may be introduced. The intake line may intake air and fuel, mix air and fuel, and then supply the intake compressor (not shown) and the gas engine 110. The fuel may be a gas.

The intake line may be connected to an intake manifold, an intake compressor, or the like of the gas engine 110.

For example, the intake line includes an air intake line into which air is introduced, a fuel intake line into which fuel is introduced, a mixer connected to the air intake line and a fuel intake line to mix air and fuel, and a mixer connected to the mixer It may include a mixer intake line for supplying to the gas engine (110). According to an embodiment, the air intake line, the fuel intake line and the mixer intake line except for the mixer may be referred to as the intake line.

In driving a gas engine using a high pressure mixer or the like, the pressure of the mixer is very important. Therefore, a pressure sensor is often provided to sense the pressure of a gas engine such as a mixer.

Therefore, the gas engine power generation system 100 according to an embodiment of the present invention may further include a sensor unit 160 including a pressure sensor (not shown) for sensing the pressure of the gas engine 110. .

More preferably, the pressure sensor is a map (Manifold Absolute Pressure: MAP) sensor disposed in the intake manifold of the gas engine, and in this case, the pressure data of the gas engine 110 sensed by the sensor unit 160. May be suction pressure data.

Increasing the temperature of a generator, which plays a direct role in power generation, can lead to a decrease in power generation efficiency. In addition, if the generator overheats above a certain level, there is a risk that a serious safety accident may occur.

Therefore, the power generation system usually includes a cooling system such as a radiator in many cases.

On the other hand, the cogeneration system of the present invention generates heat together with electric power during its operation, and operates even if only one of the power load and the hot water load is present.

The gas engine 110 may rotate in proportion to one of the power load and the hot water load. As the number of rotations of the gas engine 110 increases, the heat energy generated by the gas engine 110 increases, so that it may correspond to an increase in the hot water load.

In addition, as the number of rotations of the gas engine 110 increases, since the rotor is connected to the output shaft of the gas engine 110, when the output shaft rotates, the power output of the generator 120 that generates power increases, thus increasing the power load. It can respond.

When there is a power load and no hot water load, it may be more necessary to recover heat from the gas engine 110 to radiate heat to the outside in order to protect the gas engine 110.

Therefore, the cogeneration system of the present invention may further include a cooling system such as a radiator (not shown) for radiating heat generated from the gas engine 110. In this case, the radiator may be implemented by air cooling, water cooling, or the like.

The gas engine power generation system 100 according to an embodiment of the present invention may further include a controller 140 for controlling the overall operation of the gas engine power generation system 100.

According to an embodiment, the controller 140 controls the engine controller 141 for controlling the gas engine 110, the generator controller 142 for controlling the generator 120, and the power converter 130. It may include a power converter controller 143.

The controller 140 may control an operation of the gas engine power generation system 100 based on various data sensed by the sensor unit 160.

For example, the sensor unit 160 includes a map (Manifold Absolute Pressure (MAP)) sensor disposed in the intake manifold 14a of the gas engine 110, and the control unit 140 senses the sensor by the member sensor. Inhaled pressure data can be monitored. In addition, the controller 140 may determine the suction pressure change amount.

In addition, the controller 140 may vary the map MAP value corresponding to the supplied fuel.

On the other hand, when the amount of change in suction pressure is within a preset range, the control unit 240 may calculate that the steady state.

When the intake manifold absolute pressure (MAP) corresponding to the fuel is not controlled, the efficiency of the gas engine 110 may be reduced.

The gas engine power generation system 100 according to an exemplary embodiment of the present invention may include a memory 150 and an engine controller 141 for storing an ignition timing and a MAP value corresponding to a fuel, an operating condition, and the like.

The memory 150 may store the driving table 151, and the engine controller 141 may control the MAP value corresponding to the load and the driving condition.

The controller 140 may control each component based on the driving table 151.

The power converter 130 may convert the input power to supply the load. For example, the power converter 130 may convert the power produced by the generator 120 into a three-phase alternating current to supply the load.

As another example, the power conversion apparatus 130 according to an embodiment of the present invention may be a device for driving a motor by converting the input power.

The power converter 130 includes a converter 131 for converting an input power source into a DC power source and outputting the same to a dc terminal, a capacitor C connected to the dc terminal, and a plurality of switching elements. It may include an inverter 132 to convert the DC power of the AC.

The power converter controller 143 may include a converter controller for controlling the converter 131 and an inverter controller for controlling the inverter 132.

The converter 131 may convert AC power into DC power and output the DC power.

Meanwhile, the converter 131 may be formed of a diode or the like without a switching element, and may perform a rectifying operation without a separate switching operation.

For example, in the case of single phase AC power, four diodes may be used in the form of a bridge, and in the case of three phase AC power, six diodes may be used in the form of a bridge.

The converter 131 may be, for example, a half bridge type converter in which two switching elements and four diodes are connected. In the case of a three-phase AC power supply, six switching elements and six diodes may be used. .

The inverter 132 may output the converted AC power to the load of the gas engine power generation system 100 including the power converter 130. That is, the inverter 132 may serve to convert the power produced by the generator 120 to supply the load.

Alternatively, the inverter 132 may output the converted AC power to the generator 120 of the gas engine power generation system 100. That is, the inverter 132 may serve to drive the generator 120.

In addition, the power converter controller 143 may transmit a generator speed (frequency) to the engine controller 141 in response to a load condition, and the engine controller 141 may receive the received generator speed (frequency). Accordingly, the gas engine 110 can be driven.

The input power input to the power converter 130 is AC power or DC power supplied from the generator 120, and the converter 131 may be an AC-DC converter or a DC-DC converter.

The power converter 130 according to an embodiment of the present invention may be connected to a DC generator, and convert the power generated by the DC generator to supply the load. In this case, the converter 131 may be a DC-DC converter.

Alternatively, the power converter 130 according to an embodiment of the present invention may be connected to an alternator and convert the power generated by the alternator to supply the load. In this case, the converter 131 may be an AC-DC converter.

An alternator is a generator commonly used in a cogeneration system, and the power converter 130 according to an embodiment of the present invention may convert and output power generated in an alternator into a three-phase AC power suitable for supplying a load. have.

Alternatively, the inverter 132 may output the load of the three-phase power generation system. That is, the inverter 132 may serve to convert the power produced by the generator 120 to supply the load.

On the other hand, the increase in temperature of the generator 120 leads to a decrease in efficiency, a change in power generation occurs. Accordingly, the power converter 130 increases the load as much as the efficiency drop in the gas engine 110 in order to increase the amount of power generated by the efficiency reduction in the generator 120.

Therefore, a correlation between the temperature rise of the generator 120 and the rise of the load of the gas engine 110 is formed, and this can be reviewed with logic to determine the generator overheating state, and prevent problems with the generator cooling in advance.

According to an embodiment of the present disclosure, the controller 140 determines an overheat state of the generator 120 based on pressure data sensed by the pressure sensor of the sensor unit 160 in the gas engine 110. The driving of the gas engine 110 and the generator 120 may be controlled.

More preferably, the pressure sensor is a map (Manifold Absolute Pressure: MAP) sensor disposed in the intake manifold of the gas engine 110, in which case the gas engine 110 sensed by the sensor unit 160 Pressure data may be suction pressure data.

If a failure occurs in the cooling system of the generator 120, the generator 120 may be overheated. According to an embodiment of the present invention, a problem caused by a failure of the cooling system of the generator may be detected based on an operating state of the gas engine 110.

The controller 140 may monitor the pressure data of the gas engine 110 to determine an overheat state of the generator 120. In particular, the controller 140 may determine the overheat state of the generator 120 based on the suction pressure data sensed by the map sensor in the intake manifold of the gas engine 110.

In addition, the controller 140 may operate the system according to the generator overheating determination logic, and may control the generator 140 to be operated under an appropriate temperature.

If a situation in which the generator 120 is not sufficiently cooled due to a foreign material input of the generator 120 of the cogeneration system and a failure of a cooling system such as a radiator or a fan, the core of the generator 120, a coil The temperature is continuously increased because cooling is not performed on the coil and the enclosure.

Increasing the temperature of the generator 120 leads to a decrease in efficiency, and thus a decrease in power generation occurs. Accordingly, the power converter 130 compensates for the decrease in power generation due to the decrease in efficiency of the generator 120. 110) increases the load. Therefore, the temperature rise of the generator 120 and the load rise of the gas engine 110 have a positive correlation.

The power converter control unit 143 controls to increase the generator rotation speed (frequency) so that the engine control unit 141 can further generate power corresponding to the decrease in power generation amount due to the decrease in the efficiency of the generator 120 so as to satisfy the target power generation amount. You can send a signal.

The engine controller 141 may drive the gas engine 110 to satisfy the received generator speed.

In addition, the control unit 140, based on the determined overheating state of the generator 120, the generator control unit 142 for controlling the driving of the generator 120 and the engine control unit for controlling the driving of the gas engine 110. 141 may include.

For example, when it is determined that the generator 120 is finally in the overheat state, the generator control unit 142 and the engine control unit 141 may change operating conditions such as rotation speeds of the generator 120 and the gas engine 110, respectively. Can be.

Alternatively, when it is determined that the generator 120 is finally in the overheated state, the generator control unit 142 and the engine control unit 141 may stop the operation of the generator 120 and the gas engine 110, respectively.

In the case of a failure of the generator fan, the current consumption of the fan can be determined by measuring the current consumption of the fan through a current sensor, but a current sensor is required, and a cooling system failure and / or caused by other causes besides the fan failure may occur. Or there is a limit that can not determine the generator overheating state.

However, according to the present invention, there is no need to sense through a separate additional sensor, it is possible to determine the abnormal heating state of the generator 120 due to the foreign matter inflow and other engine room overheating problems, such as fan failure.

According to an embodiment, the control unit 140 determines the overheat state of the generator 120 based on the pressure data of the sensed gas engine 110 when the load and the operating conditions are not changed during a predetermined reference time. can do.

For example, if the load and the operating conditions are not changed during the predetermined reference time in the specific load and the operating conditions, the controller 140 may generate the generator 120 based on the suction pressure data sensed by the map sensor after the reference time. ) Overheating state can be determined.

If the load and the operating conditions change, the operating state of the gas engine 110 also changes. In addition, as the load and operating conditions change, the gas engine 110 is driven, and after a predetermined time elapses, various data values are saturated and stabilized, so that the stabilized data values are used instead of instantaneously changing data values. It is possible to determine the state of overheating more accurately.

Meanwhile, the controller 140 may determine that the generator 110 is in an overheated state when the amount of change in suction pressure sensed during the predetermined determination reference time is greater than or equal to the overheat determination reference value. That is, the controller 140 may determine that the suction pressure change amount is smaller than the preset overheat determination reference value, and determine that the suction state is in the normal state, and when the suction pressure change amount is equal to or larger than the overheat determination reference value, the control unit 140 may determine that the suction state is in the thermal state.

Alternatively, the controller 140 may determine the overheat state of the generator 110 based on the average value of the suction pressure change amount sensed during a predetermined reference time. That is, the overheat judging reference value is set corresponding to the average value of the suction pressure change amount, and if the suction pressure change amount exceeding the overheat judging reference value occurs at any one time, it is not judged to be an overheated state, but rather the accumulation of the suction pressure change amounts in a predetermined section After calculating the average value, it can be determined that the generator 110 is in an overheat state if the average value of the suction pressure change amount is a superheat determination reference value.

Accordingly, it is possible to reduce the probability of misjudgment of the overheat state determination, which may occur when the suction pressure change amount splashes rapidly, and prevent the system from being stopped due to the misjudgment.

In addition, according to an embodiment of the present invention, in order to further increase the accuracy of the overheat state determination, the overheat state determination may be performed a plurality of times.

For example, the controller 140 may first determine an overheat state of the generator 120 based on an average value of the amount of change in suction pressure sensed during a predetermined reference time. In this case, the controller 140 may determine that the generator 120 is in an overheated state when the average value of the change in suction pressure sensed during the first determination reference time is equal to or greater than the overheat determination reference value.

In addition, when the average value of the suction pressure change amount is greater than or equal to the overheat determination reference value, the control unit 140 may reduce the determination reference time and the overheat determination reference value to secondarily determine the overheat state of the generator.

The controller 140 may reduce the determination reference time of the secondary determination and the overheat determination reference value when the average value of the suction pressure change amount is equal to or greater than the overheat determination reference value at the time of the secondary determination, and thus the overheat state of the generator. 3 can be determined.

If it is determined in the third determination that the generator 120 is overheated, the controller 140 may control to stop the operation of the gas engine 110 and the generator 120.

On the other hand, the control unit 140, when the average value of the suction pressure change amount is less than the second overheating determination reference value at the second determination, the second determination reference time and the second overheating determination reference value of the second determination is 1 The primary determination reference time and the primary overheat determination reference value may be increased to determine the primary again.

The third determination reference time and the third overheating determination reference value of the third determination may include the second determination reference time and the third determination value when the average value of the suction pressure change amount is less than the third overheating determination reference value. The secondary determination can be made again by increasing the secondary overheat determination reference value.

That is, if the overheating determination condition of the predetermined degree is satisfied, the process proceeds to the overheating determination of the next degree, and if the overheating determination condition of the predetermined degree is not satisfied, the overheating determination of the previous degree can be returned.

In the present embodiment, the overheat state of the generator 120 may be determined by judging the operation state through the suction pressure change of the gas engine 110 in three stages without using an additional additional measurement sensor and equipment. Can be.

In addition, as the degree of each step increases, by determining the overheating state while reducing the determination reference time and the overheating determination reference value, it is possible to minimize the time required due to the determination of the plurality of overheating states, and the generator 120 before the final determination. The occurrence of a large abnormality can be prevented.

When a problem occurs in the cooling function of the generator 120, the internal temperature of the generator 120 is continuously raised, thereby increasing the load applied to the gas engine 110.

In the present embodiment, the load increase may be determined using the suction pressure data of the gas engine 110, and accordingly, whether the generator 120 is overheated may be determined.

In addition, by determining whether the generator 120 is overheated several times, reducing the error, and if the load of the gas engine 110 continuously increases over a certain level, the system can be stopped and checked by the system operator.

Gas engine power generation system according to an embodiment of the present invention, may further include an output unit 170 for outputting a notification about the overheating state of the generator 120.

For example, the output unit 170 includes a display and / or a speaker, and when it is determined that the generator 120 is in an overheat state, the control unit 140 controls the overheat state of the generator 120. An image and / or sound informing of this may be output.

Gas engine power generation system according to an embodiment of the present invention, may further include a communication unit 180 for transmitting information on the overheat state of the generator 120 to a predetermined device.

For example, the communication unit 180 includes one or more communication modules, and when it is determined that the generator 120 is in an overheating state, under the control of the controller 140, the communication unit 180 notifies the overheating state of the generator 120. The signal can be transmitted to a preset device.

3 is a flowchart illustrating a control method of a gas engine power generation system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, first, the gas engine 110 is driven, and the controller 140 may control the gas engine 110 to a normal state and monitor suction pressure data (S310).

The controller 140 may perform a plurality of superheat state determination steps S330, S340, and S350 to improve the accuracy of the overheat state determination of the gas engine 110.

For example, the controller 140 may firstly overheat a state of the generator 120 that generates power according to the driving of the gas engine 110 based on the suction pressure data sensed by the gas engine 110. Can be determined (S330).

In addition, when it is determined that the generator 120 is overheated in the first determination step (S330), the controller 140 based on the suction pressure data sensed by the gas engine 110, the generator 120. The overheat state of the second can be determined (S340).

In addition, if it is determined that the generator 120 is overheated in the second determination step S340, the controller 140 based on the suction pressure data sensed by the gas engine 110, the generator 120. The overheat state of the third can be determined (S350).

If the generator 120 is not determined to be overheated in the second determination step S340, the controller 140 may control to enter the first determination step S330 again.

That is, if the overheating determination condition of the predetermined degree is satisfied, the process proceeds to the overheating determination of the next degree, and if the overheating determination condition of the predetermined degree is not satisfied, the overheating determination of the previous degree can be returned.

According to an embodiment, the controller 140 may control to enter the first determination step S310 when the load and the driving condition are not changed during the predetermined reference time (S310).

That is, after being driven for a certain time and stabilized under a specific load and an operating condition, the overheat state may be more accurately determined using the sensed stabilized data value.

On the other hand, in the first to third determination step (S330, S340, S350), the control unit 140, based on the average value of the amount of change in suction pressure sensed during a predetermined reference time period, overheating state of the generator 120 The generator 120 may determine that the generator 120 is in an overheated state when the average value of the change in suction pressure sensed during the determination reference time is equal to or greater than the overheat determination reference value.

According to an embodiment, the second determination reference time and the second overheating determination reference value in the second determination step (S340) are smaller than the first determination reference time and the first overheating determination reference value in the first determination step (S330). The third determination reference time and the third overheat determination reference value in the third determination step S350 may be smaller than the second determination reference time and the second overheat determination reference value in the second determination step S340.

As the degree of each step increases, by determining the overheating state while reducing the determination reference time and the overheating determination reference value, it is possible to minimize the time required due to the determination of the plurality of overheating states, and before the final determination, the generator 120 or the like. Large abnormality can be prevented from occurring.

In this case. In the second determination step (S340), the controller 140 may control to enter the first determination step (S340) again when the average value of the suction pressure change amount is less than the first overheating determination reference value.

In addition, if it is determined in the third determination step S350 that the generator 120 is overheated, the controller 140 may control to stop the operation of the gas engine 110 and the generator 120. There is (S370).

Since the gas engine 110 is controlled based on the driving map 151 by the controller 140, the generator may be configured by examining the change and the slope of the constant suction pressure with respect to the same rotation speed and the suction pressure corresponding to the load and the driving conditions. The abnormal heating problem of 120 may be determined.

When the operating conditions such as the engine speed, the amount of power generation, the hot water (hot water) load, etc. are the same, the MAP (intake pressure) of the engine is almost changed.

However, when a situation in which the generator 120 is not sufficiently cooled due to a failure of a foreign material input and a cooling system occurs, the temperature of the generator 120 may continuously increase.

The increase in temperature of the generator 120 leads to an increase in the load of the gas engine, and the increase in the load of the gas engine may be detected by sensing an increase in the MAP.

According to an embodiment of the present disclosure, the controller 140 may stop the system and check the cooling system of the generator 120 when the suction pressure rises above a predetermined limit.

According to an embodiment of the present disclosure, the controller 140 may check the cooling system of the generator 120 by stopping the system when the amount of change in suction pressure or the average value of the amount of change in suction pressure rises to a predetermined reference value or more. .

Thereby, the overheat state of the generator can be determined, and the reliability of the generator can be improved.

Gas engine power generation system according to an embodiment of the present invention, may further include an output unit 170 for outputting a notification about the overheating state of the generator 120.

For example, the output unit 170 includes a display and / or a speaker, and when it is determined that the generator 120 is in an overheat state, the control unit 140 controls the overheat state of the generator 120. An image and / or sound informing of this may be output (S370).

4 is a flowchart illustrating a control method of a gas engine power generation system according to an exemplary embodiment of the present invention.

Referring to FIG. 4, first, the gas engine 110 is driven, and the controller 140 may control the gas engine 110 to a normal state and monitor suction pressure data and the like (S410).

The gas engine 110 is controlled based on the driving map. Therefore, it is possible to determine the abnormal heat generation problem of the generator by examining the change and the slope of the constant suction pressure for the same rotational speed and the suction pressure.

When the operating conditions such as the engine speed, power generation amount, hot water (hot water) load and the like are the same, the change in the MAP (suction pressure) of the gas engine 110 is operated with little change.

However, if the generator 120 is not sufficiently cooled due to a failure of the foreign substance input and cooling system, the temperature of the generator 120 continues to rise.

When the temperature of the generator 120 rises, power generation efficiency is lowered, and the amount of power generation is reduced.

In order to satisfy the target load, the gas engine power generation system 100 must increase the amount of power generated so as to offset the reduced amount of power generation, thereby driving the gas engine 110 in the direction of increasing the load.

According to an embodiment of the present invention, the control unit 140 may determine the overheat state of the generator 120 by using the MAP (intake pressure) that varies with an increase in the load of the gas engine 110.

The controller 140 may check whether or not the gas engine 110 is rotated, the power generation load, and the hot water supply load are changed while the gas engine 110 is normally controlled (S410).

For example, when the load and the operating conditions such as power generation (generation amount), hot water supply (hot water) load, etc., through the gas engine 110 rotation speed and the power converter 130 are fixedly operated for 30 minutes. In operation S420, it is possible to check whether the operation is stable by examining the change in the operating condition and the load state.

Typically, the temperature is saturated to some extent for up to about 30 minutes, so the load and operating conditions of the generator 120 that are generating power are not greatly changed.

When the controller 140 is stably operated without changing the load for 30 minutes (S425), the controller 140 enters an overheat determination logic for checking the change in suction pressure (S430).

The controller 140 may process suction pressure data sensed through the map sensor.

The control unit 140 first checks the change amount of the suction pressure for 10 minutes, or calculates the average value after calculating the average value of the change amount (S430), so that the change amount or the average value of the suction pressure is not greater than or equal to the reference value +20 hPa. If it is (S435), it can continue to the primary decision logic.

Here, 10 minutes may be the primary determination reference time, and the reference value + 20 hPa may be the primary overheat determination reference value. The first judgment reference time may be set to a predetermined value within a range of 10 minutes to 20 minutes.

If the change amount or the average value of the suction pressure is equal to or greater than the primary overheating reference value (eg, the reference value +20 hPa), the controller 140 enters the secondary judgment logic to determine whether the secondary overheating reference value (eg, the suction pressure change is 10hPa) or more. It will be checked (S440).

In the secondary judgment logic, data for the second judgment reference time set in the range of 5 minutes to 10 minutes can be used.

On the other hand, if it is determined that the secondary determination result is greater than or equal to the secondary overheating determination reference value (S445), the controller 140 enters the tertiary determination logic to accumulate additional suction pressure values during the tertiary determination reference time and calculate an average value. It is calculated (S450). The third judgment reference time may be set to a predetermined value within a range of 3 minutes to 10 minutes.

If the average change amount or the calculated average value is equal to or greater than the third overheating determination reference value (S455), the controller 140 may stop the system to generate and output a cooling system abnormal error of the generator 120 (S460). .

In the determination logic using the respective suction pressures, if the overheating determination criteria are not satisfied in the third determination, the second determination may be returned. If the overheating determination criteria are not satisfied in the second determination, the determination logic may return to the first determination.

In this way, the behavior of the suction pressure can be determined according to each state, thereby improving the stability of the system and the reliability of the generator.

5 and 6 are views referred to in the description of the gas engine power generation system and control method thereof according to an embodiment of the present invention.

As the temperature of the generator 120 rises, the gas engine 110 is driven to output the same amount of power generation, thereby increasing the suction pressure MAP of the gas engine 110.

Therefore, the overheated state of the generator 120 may be determined by the suction pressure MAP of the gas engine 110.

5 and 6, the overheat determination logic is divided into 1st, 2nd, 3rd order, and after entering the logic according to each order, the escape may escape in the 3rd, 2nd, 1st order.

Entering the first judgment logic at the first time point t1, and enters the second judgment logic when the amount of change or the average value of the change amount of the suction pressure satisfies the overheat state determination condition during the predetermined period from the first time point t1. can do.

The second determination logic may be entered at the second time point t2, and it may be determined whether a change amount of the suction pressure or an average value of the change amount satisfies the overheat state determination condition during a predetermined period from the second time point t2. .

If the change amount of the suction pressure or the average value of the change amounts does not satisfy the overheat condition determination condition, the second determination logic may escape.

On the other hand, the first decision logic enters again at the time point t3 when the escape from the second judgment logic, and during the predetermined period (t3 to t4), whether the change amount of the suction pressure or the average value of the change amount satisfies the overheat state determination condition You can determine whether or not.

If the change amount of the suction pressure or the average value of the change amounts does not satisfy the overheat condition determination condition, the second determination logic may escape.

According to an embodiment of the present invention, after entering the determination logic for each order, the change in suction pressure is accumulated and averaged for a predetermined time, and the next order entry or the corresponding order escape is made according to whether the criterion is satisfied.

Referring to FIG. 6, as a problem occurs in the cooling system, when the internal temperature of the generator is continuously raised, the suction pressure may be continuously increased.

Therefore, the first and second third suction pressure determination conditions are satisfied. For example, when entering the primary determination logic, if the change amount of the suction pressure or the average value of the change amount satisfies the overheat state determination condition from the predetermined time point t5, the second determination logic may be entered.

 After entering the secondary determination logic, and when the amount of change or the average value of the amount of change of the suction pressure satisfies the overheat state determination condition during the predetermined period from the predetermined time point t6, the third determination logic may be entered.

The controller 140 generates a system error and stops the system when the amount of change in the suction pressure or the average value of the change amount satisfies the overheat state determination condition during the preset period from the predetermined time point t7. You can.

In such a situation, all of the third determination conditions are satisfied, so that the determination logic cannot be escaped and operation of the gas engine power generation system is stopped due to an error.

At this time, the system which stopped operation due to an error continuously outputs an error message from a predetermined time point t8 until repair and inspection confirmation, thereby preventing the risk of the same problem occurring upon restarting.

According to at least one of the embodiments of the present invention, it is possible to determine the overheat state of the generator and to operate stably.

In addition, according to at least one of the embodiments of the present invention, it is possible to provide a gas engine power generation system and a control method thereof that are effective in terms of economy and stability by determining the overheat state of the generator, without the addition of a dedicated sensor.

In addition, according to at least one of the embodiments of the present invention, it is possible to accurately determine the overheating of the generator, the failure of the generator cooling system.

The gas engine power generation system according to the present invention is not limited to the configuration and method of the embodiments described as described above, but the embodiments may be selectively or partially all of the embodiments so that various modifications can be made. It may be configured in combination.

On the other hand, the control method of the gas engine power generation system according to an embodiment of the present invention, it is possible to implement as a processor-readable code on a processor-readable recording medium. The processor-readable recording medium includes all kinds of recording devices that store data that can be read by the processor. Examples of the processor-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like, and may also be implemented in the form of a carrier wave such as transmission over the Internet. . The processor-readable recording medium can also be distributed over network coupled computer systems so that the processor-readable code is stored and executed in a distributed fashion.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

Gas Engine Power Generation System: 100
Gas engine: 110
Generator: 120
Power Inverter: 130
Control Unit: 140
Sensor section: 160

Claims (16)

Gas engines;
A generator for generating electric power in accordance with driving of the gas engine;
A power converter converting and outputting the power produced by the generator;
A sensor unit including a pressure sensor for sensing a pressure of the gas engine; And,
And a controller configured to determine an overheat state of the generator based on the sensed pressure data of the gas engine and to control driving of the gas engine and the generator.
The control unit, if the load and operating conditions do not change during a predetermined reference time, based on the pressure data of the sensed gas engine, the gas engine power generation system, characterized in that for determining the overheating state of the generator. The method of claim 1,
The pressure sensor is a map (Manifold Absolute Pressure (MAP)) sensor disposed in the intake manifold of the gas engine, and the pressure data of the sensed gas engine is intake pressure data, characterized in that. The method of claim 1,
The control unit may include a generator control unit controlling the driving of the generator and an engine control unit controlling the driving of the gas engine based on the determined overheating state of the generator. delete The method of claim 1,
And the controller determines that the generator is in an overheated state when the amount of change in suction pressure sensed during a predetermined reference time period is equal to or greater than the superheat determination reference value. The method of claim 1,
The control unit,
The primary overheating state of the generator is first determined based on the average value of the suction pressure change amount sensed during a predetermined reference time period,
And determining that the generator is in an overheated state when the average value of the change in suction pressure sensed during the determination reference time is equal to or greater than the overheat determination reference value. The method of claim 6,
The control unit, when the average value of the suction pressure change amount is greater than or equal to the overheat determination reference value, by reducing the determination reference time and the overheat determination reference value, the gas engine power generation system, characterized in that for determining the second state of overheating of the generator . The method of claim 7, wherein
The control unit may determine the overheat state of the generator in a third manner by reducing the determination reference time of the secondary determination and the overheat determination reference value when the average value of the suction pressure change amount is greater than or equal to the overheat determination reference value at the second determination. Gas engine power generation system, characterized in that. The method of claim 8,
The control unit may increase the determination reference time of the secondary determination and the overheat determination reference value and perform primary determination when the average value of the suction pressure change amount is less than the overheat determination reference value during the second determination. Gas engine power generation system. The method of claim 1,
An output unit for outputting a notification about the overheating state of the generator; Gas engine power generation system further comprising. Driving the gas engine;
Based on suction pressure data sensed by the gas engine, primarily determining an overheat state of a generator that generates electric power according to driving of the gas engine;
Determining that the generator is overheated based on suction pressure data sensed by the gas engine when it is determined that the generator is overheated in the first determination step; And,
And determining the overheat state of the generator on the basis of the suction pressure data sensed by the gas engine, if it is determined that the generator is overheated in the secondary determination step.
And if the load and the operating conditions do not change during the predetermined reference time, enter the first determination step. delete The method of claim 11,
In the first to third determination step, the overheat state of the generator is determined based on the average value of the amount of change in suction pressure sensed during a predetermined reference time period,
And determining that the generator is in an overheated state when the average value of the suction pressure change sensed during the determination reference time is equal to or greater than the overheat determination reference value. The method of claim 13,
The determination reference time and the overheating determination reference value in the second determination step are smaller than the determination reference time and the overheating determination reference value in the first determination step,
The control method of the gas engine power generation system, characterized in that the determination reference time and the overheat determination reference value in the third determination step is smaller than the determination reference time and the overheat determination reference value in the second determination step. The method of claim 14,
In the secondary determination step, if the average value of the suction pressure change amount is less than the overheat determination reference value, the control method of the gas engine power generation system, characterized in that to enter the primary determination step again. The method of claim 11,
In the third determination step, if it is determined that the generator is overheated, stopping the operation of the gas engine and the generator; Control method of a gas engine power generation system further comprising.

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