JP2008154435A - Cogeneration generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cogeneration generator that is advantageous to prevent the occurrence of adverse effects due to a poor conduction in an independent output system. <P>SOLUTION: The cogeneration generator includes: a generator, which can execute interconnected output operation for feeding power to an interconnected output system and independent output operation for feeding power to an independent output system; a drive part for driving the generator; a switching part for switching the interconnected output operation and the independent output operation; a conduction-abnormality detection means, which executes diagnostic processing for detecting the presence or the absence of a conduction abnormality in the independent output system; and a diagnostic timing determination means that determines timing for periodically executing diagnostic processing when the independent output operation is not executed. When an elapsed time measured by a time measurement means exceeds a first threshold time, the diagnostic timing determination means determines that it reaches timing to execute the diagnostic processing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cogeneration power generation apparatus capable of performing a linked output operation linked to a commercial power supply and a self-sustained output run not linked to a commercial power supply.

  Cogeneration power generators have been developed that can perform a linked output operation linked to a commercial power source and a self-sustained output operation not linked to a commercial power source. In this case, even in the event of a power failure of the commercial power supply, it is possible to perform an independent output operation not linked to the commercial power supply. For this reason, electric power can be supplied to a load (for example, a refrigerator), and the load can be operated satisfactorily even when a commercial power supply fails.

  However, in the cogeneration power generation apparatus, an interconnected output operation that is interconnected with a commercial power source is routinely performed, and an independent output operation that supplies power to the independent output system is not performed except in an emergency. For this reason, even if an energization failure occurs in the independent output system, no energization failure in the independent output system is found until the next maintenance time.

Patent Document 1 discloses a converter, a connection clip connected to an electrical wiring that is wired to a building but not connected to a commercial power source, and a ground that is connected to an iron core installed on the ground. A clip, a current detection circuit for detecting a current flowing between the connection clip and the grounding clip, and a buzzer for notifying an operator when a current flowing between the connection clip and the grounding clip is detected. An earth leakage detection device is disclosed.
JP 2006-42428 A

  By the way, a conduction failure may occur in the self-sustained output system of the cogeneration power generator. For example, in a structure such as a house or building, if a tool such as a nail is struck against the electrical wiring of a self-sustained output system, the electrical wiring may leak through the tool such as a nail or the electrical wiring may be short-circuited. Failure to energize may occur. In this case, the self-sustained output system is much less frequently fed than the interconnected output system. For this reason, even if energization failure occurs in the independent output system, the energization failure in the independent output system is often not found until the next maintenance time. Therefore, when a commercial power failure occurs, even if an attempt is made to perform an independent output operation for supplying power to the independent output system, the independent output operation may be hindered.

  Although the technology according to Patent Document 1 described above can diagnose failure of energization such as leakage or short circuit for electrical wiring that is wired to a structure but not connected to a commercial power supply, the failure of energization is regularly diagnosed. It does not disclose the technology to be performed automatically. Therefore, when power is supplied to the self-sustained output system and the self-sustained output operation is performed at the time of a power failure of the commercial power source, there is a possibility that a negative effect due to a power failure in the self-supported output system may occur.

  The present invention has been made in view of the above-described circumstances, and suppresses the occurrence of adverse effects caused by poor energization in the self-sustained output system when power is supplied to the self-sustained output system and the self-sustained output operation is performed in the event of a power failure of the commercial power It is an object of the present invention to provide a cogeneration power generation device that is advantageous to the above.

(1) A cogeneration power generation apparatus according to aspect 1 includes a power generation apparatus capable of performing a connected output operation that is connected to a commercial power supply and supplies power to a connected output system, and a self-sustained output operation that supplies power to a self-supporting output system; A drive unit that drives the power generation device to generate power with the device, a heat utilization unit that uses thermal energy generated in the drive unit, a switching unit that switches between interconnection output operation and independent output operation, and an independent output system In the cogeneration power generation device comprising the electricity supply abnormality detection means for detecting the presence or absence of the electricity supply abnormality,
There is provided a diagnosis timing determination means for determining a timing for periodically performing a diagnosis process for detecting the presence or absence of an energization abnormality in the independent output system,
Diagnosis timing determination means
Time measurement means for measuring the elapsed time at times other than the self-sustained output operation is provided, and when the elapsed time measured by the time measurement means exceeds the first threshold time, the timing for executing the diagnosis process is reached. It is characterized by determining that it has been.

  In a normal state, the power generator is switched to the grid output operation by the switching unit. Therefore, in the case of the grid output operation, the power generation apparatus performs the grid output operation for supplying power to the grid output system while being linked to the commercial power source. Accordingly, in a normal state, power is not supplied to the self-sustained output system, and thus it is not possible to perform a diagnosis process for detecting the presence / absence of an energization abnormality in the self-sustained output system. This is because, unless the self-sustained output system is energized, it is impossible to diagnose the presence or absence of energization abnormality in the self-sustained output system.

  As described above, in the case of the grid output operation linked to the commercial power source, in addition to the electric energy generated by the power generator, the heat energy generated in the drive unit that generates power can be used. Benefits are ensured and energy costs for users are reduced. However, in a normal state, since power is not supplied to the independent output system, it is not possible to perform a diagnostic process for detecting the presence or absence of an energization abnormality in the independent output system.

  Therefore, the time measuring means measures the elapsed time at times other than the independent output operation. The reason for measuring the elapsed time at times other than the self-sustained output operation is as follows. That is, when the self-sustained output operation is being performed, since the self-sustained output system is energized, it can be diagnosed whether there is a power failure in the self-sustained output system. However, when the interconnected output operation is being performed, since the self-sustained output system is not energized, it is not possible to diagnose the presence or absence of energization failure in the self-sustained output system. Therefore, the elapsed time measured by the time measuring means described above corresponds to a time during which it is not possible to diagnose the presence or absence of energization failure in the independent output system.

  The diagnosis timing determination unit determines that the timing for performing the diagnosis process has been reached when the elapsed time measured by the time measurement unit has passed the first threshold time.

  As a result, the energization abnormality detection means detects the presence or absence of an energization abnormality in the independent output system. Therefore, when power is supplied to the self-sustained output system and the self-sustained output operation is performed at the time of a power failure of the commercial power supply, the power failure in the self-sustained output system is suppressed, and the adverse effects due to the power failure are eliminated.

(2) A cogeneration power generation device according to aspect 2 includes a power generation device capable of performing a linked output operation that is connected to a commercial power supply and supplies power to a connected output system, and a self-sustained output operation that supplies power to a self-sustained output system, A drive unit that drives the power generation device to generate power with the device, a heat utilization unit that uses thermal energy generated in the drive unit, a switching unit that switches between interconnection output operation and independent output operation, and an independent output system In the cogeneration power generation device comprising the electricity supply abnormality detection means for detecting the presence or absence of the electricity supply abnormality,
There is provided a diagnosis timing determination means for determining a timing for periodically performing a diagnosis process for detecting the presence or absence of an energization abnormality in the independent output system,
The diagnosis timing determination means includes a time measurement means for measuring an elapsed time at times other than the self-sustained output operation,
Diagnosis timing determination means
If the elapsed time measured by the time measuring means exceeds the first threshold time, it is determined that the timing for performing the diagnostic processing has been reached if the grid output operation is not being performed,
If the grid output operation is being performed, it is determined that the diagnosis processing is not reached at the timing of executing the diagnosis processing.

  The time measuring means measures an elapsed time at times other than the independent output operation. When the elapsed time measured by the time measuring means has passed the first threshold time, it is determined that the timing for executing the diagnostic processing has been reached if the grid output operation is not being performed. As a result, the energization abnormality detection means detects the presence or absence of an energization abnormality in the independent output system.

  As described above, even if the measurement time has passed the first threshold time, if the current operating state of the power generation apparatus is in the grid output operation, it is determined that the timing for executing the diagnostic processing has not been reached. . The reason is as follows. That is, if the grid output operation is being performed, the commercial power source and the power generation device are linked, and in addition to the electric energy generated by the power generation device, the heat energy generated in the drive unit that generates power can be used. . For this reason, the advantage of a cogeneration power generation device is secured satisfactorily, and the energy cost of the user is reduced. This is because it is not desired to perform the diagnostic process until the connection output operation is intentionally stopped during the interconnected output operation in which such cost advantages are generated.

  As described above, when the measurement time has passed the first threshold time, if the current operation status of the power generation apparatus is not in the grid output operation, the above-described advantages are not impaired, so the diagnosis timing determination The means determines that the timing for executing the diagnostic processing has been reached. As a result, the energization abnormality detection means detects the presence or absence of an energization abnormality in the independent output system. Therefore, when power is supplied to the self-sustained output system and the self-sustained output operation is performed at the time of a power failure of the commercial power supply, the power failure in the self-sustained output system is suppressed, and the adverse effects due to the power failure are eliminated.

(3) A cogeneration power generation apparatus according to aspect 3 includes a power generation apparatus capable of performing a connected output operation that is connected to a commercial power source and supplies power to a connected output system, and a self-sustained output operation that supplies power to a stand-alone output system, A drive unit that drives the power generation device to generate power with the device, a heat utilization unit that uses thermal energy generated in the drive unit, a switching unit that switches between interconnection output operation and independent output operation, and an independent output system In the cogeneration power generation device comprising the electricity supply abnormality detection means for detecting the presence or absence of the electricity supply abnormality,
There is provided a diagnosis timing determination means for determining a timing for periodically performing a diagnosis process for detecting the presence or absence of an energization abnormality in the independent output system,
The diagnosis timing determination means includes a time measurement means for measuring an elapsed time at times other than the self-sustained output operation,
When the elapsed time measured by the time measurement means exceeds the first threshold time, the diagnosis timing determination means determines that the timing for performing the diagnosis process has been reached if the grid output operation is not being performed,
If the grid output operation is in progress, if the elapsed time measured by the time measuring means exceeds the second threshold time longer than the first threshold time, it is determined that the timing for executing the diagnostic processing has been reached. However, when the elapsed time measured by the time measuring means does not exceed the second threshold time, the timing for executing the diagnosis processing is not reached even though the first threshold time is exceeded. It is determined that it is. The time measuring means measures time when the self-sustained output operation is stopped. When the elapsed time measured by the time measuring means passes the first threshold time, the detecting means determines that the timing for performing the diagnostic processing has been reached if the grid output operation is not being performed. As a result, the energization abnormality detection means detects the presence or absence of an energization abnormality in the independent output system.

  If the current operation status of the power generation apparatus is during the interconnection output operation, it is not desired to impair the advantages of the above-described cogeneration apparatus by the interconnection output operation. For this reason, if the grid output operation is being performed, the diagnostic timing determination means when the measurement time measured by the time measurement means has not passed the second threshold time (longer than the first threshold time). Determines that the timing for executing the diagnostic process has not been reached, and does not execute the diagnostic process.

  By the way, even if the current operation state of the power generator is in the grid output operation, it is not preferable not to perform the diagnosis process for a long time. Therefore, even if the grid output operation is being performed, if the measurement time measured by the time measurement means passes the second threshold time (longer than the first threshold time), the diagnosis timing determination means Then, it is determined that the timing for performing the diagnostic process has been reached, and the diagnostic process is performed. As a result, the grid output operation is forcibly stopped, and the operation shifts to the self-sustained output operation. As a result, the middle energization abnormality detecting means detects the presence or absence of the energization abnormality in the independent output system.

  As a result, it is possible to diagnose whether there is an energization abnormality even in the independent output system. Therefore, when power is supplied to the self-sustained output system and the self-sustained output operation is performed in the event of a power failure of the commercial power supply, the adverse effects caused by energization failure in the self-supported output system are eliminated.

  (4) According to the cogeneration power generation apparatus according to aspect 4, in aspects 1 to 3, the heat utilization unit includes a hot water storage tank that stores hot water heated by a drive unit that is operated by supplying fuel, and the hot water storage tank Hot water thermal energy detection means for directly or indirectly detecting the thermal energy of the hot water in the water is provided, and the diagnostic timing judgment means performs diagnostic processing when the thermal energy of the hot water in the hot water tank exceeds a threshold value It is characterized in that it is determined that the timing has been reached.

  The hot water thermal energy detecting means detects the thermal energy of the hot water in the hot water tank directly or indirectly, and the temperature sensor that detects the temperature of the hot water in the hot water tank directly or indirectly, or the drive unit A temperature sensor that directly or indirectly detects the temperature of the coolant in the coolant path that cools the coolant, or a temperature sensor that detects the temperature of the drive unit itself is exemplified. The diagnosis timing determination unit determines that the timing for performing the diagnosis process has been reached when the thermal energy of the hot water in the hot water tank detected directly or indirectly by the hot water thermal energy detection unit exceeds a threshold value.

  Here, when the thermal energy of the hot water in the hot water tank directly or indirectly detected by the hot water thermal energy detection means exceeds a threshold value, that is, when the thermal energy is considerably accumulated in the hot water of the hot water tank, It is estimated that the utilization rate of the hot water in the tank is decreasing, and it is estimated that this is the time when the merit (advantage of using hot water) of the cogeneration power generator is not sufficiently obtained. For this reason, even when the hot water thermal energy detected by the hot water thermal energy detection means directly or indirectly exceeds the threshold, even if the grid output operation is forcibly stopped for a short time, There seems to be no problem. As a result, it is possible to diagnose whether there is an energization abnormality even in the independent output system. Therefore, when power is supplied to the self-sustained output system and the self-sustained output operation is performed at the time of a power failure of the commercial power supply, the power failure in the self-sustained output system is suppressed, and the adverse effects due to the power failure are eliminated.

  According to the cogeneration power generation apparatus according to the present invention, the interconnection output operation is generally performed, and the frequency of the independent output operation is small. Even in such a situation where the frequency of implementation is extremely low, it is possible to periodically diagnose the presence or absence of an energization abnormality in the independent output system more frequently than in the case of the conventional periodic inspection. Therefore, the presence or absence of an energization abnormality in the independent output system can be detected at an early stage. Therefore, when power is supplied to the self-sustained output system and a self-sustained output operation is performed in the event of a power failure of the commercial power supply, the adverse effects caused by poor energization in the self-supported output system are eliminated. In addition, a leakage and / or a short circuit are illustrated as an energization failure.

(Embodiment 1)
FIG. 1 schematically shows a form in which a cogeneration power generation apparatus is electrically connected to a commercial power source 1. As shown in FIG. 1, a commercial power source 1 that is a power source fed from an electric power company, a power generation device 2 that can be linked to the commercial power source 1, and a drive rotary shaft 20 that drives the power generation device 2 to generate power with the power generation device 2. And outputs a command for switching the switching unit 6 between the linked output operation and the independent output operation to the switching unit 6. And a control device 7 for performing the operation.

  As shown in FIG. 1, the interconnection output system 4 is connected to the main interconnection path 40 between the commercial power supply 1 and the power generation device 2 and between the commercial power supply 1 and the power generation device 2. A plurality of main breakers 42 and 43 provided in the path 40, a load 47 that consumes electric power (various devices such as a power load, a refrigerator, a heater, and an illumination lamp) and a main interconnection path 40 are connected in parallel. A sub-linkage path 44 and a plurality of sub-breakers 46 provided in each sub-linkage path 44 so as to be positioned between the load 47 and the commercial power source 1 are provided. The load 47 may be anything that consumes electric power, and examples thereof include a refrigerator, a warm storage, an illumination lamp, a computer, a water supply device, and a drainage device. The sub breaker 46 in the interconnection output system 4 functions as an energization abnormality detection means for performing a diagnosis process for detecting the presence or absence of an energization abnormality (leakage and / or short circuit) in the interconnection output system 4. An energization failure signal of an energization failure (leakage or short circuit) in the interconnection output system 4 detected by each breaker 42, 43, 46 is input to the control device 7.

  As shown in FIG. 1, the independent output system 5 is electrically connected to the interconnection output system 4 via a switching unit 6. The independent output system 5 is in parallel with the main independent output path 50 so as to electrically connect the main independent output path 50 electrically connected to the power generator 2 and the main independent output path 50 and the important load 52. And a plurality of independent output circuit breakers 56 provided in the auxiliary independent output path 54 so as to be located between the main independent output path 50 and the important load 52. Yes. The important load 52 may overlap with the load 47, and a refrigerator and an emergency light that are required to operate even when the commercial power supply 1 is interrupted are exemplified. The important load 52 may not overlap with the load 47.

  The sub-breaker 56 for self-sustained output in the self-sustained output system 5 functions as a power-supply abnormality detecting unit that performs a diagnosis process for detecting a power-on abnormality (leakage and / or short circuit) in the self-supported output system 5. An energization failure signal of an energization failure (leakage or short circuit) in the independent output system 5 detected by the independent output breaker 56 is input to the control device 7.

  When the above-described breakers 56, 42, 43, 46 detect a leakage and a short circuit in the grid output system 4 and the independent output system 5, the control device 7 includes a first alarm device 201 for a leakage alarm and a first alarm circuit for a short circuit alarm. 2 An alarm signal is output to the alarm device 202, and an alarm is issued by the first alarm device 201 and the second alarm device 202.

  The switching unit 6 is set so that only one of the independent output system 5 and the interconnection output system 4 can supply power. That is, the switching unit 6 is set so that power cannot be supplied to both the independent output system 5 and the interconnected output system 4 at the same time.

  The drive unit 3 is formed of an engine 30 that is driven by supply of fuel such as gas fuel or liquid. Furthermore, a hot water storage tank 39 (heat utilization part) for storing hot water that is warmed by a coolant that cools the cooling part 30c of the engine 30 is provided. Specifically, the drive unit 3 is configured to circulate a coolant that cools the engine 30 and the cooling unit 30c of the engine 30 and circulates the circulation passage 32 having the first heat exchange passage 31 and the cooling provided in the circulation passage 32. A hot water storage passage 37 having a first heat pump 33 (coolant transfer element) as a water pump, a second heat exchange passage 36 provided so as to exchange heat with the first heat exchange passage 31 of the circulation passage 32, and a hot water storage passage 37 And a second pump 38 (water transport element) for transporting the water. The first heat exchange passage 31 and the second heat exchange passage 36 form a heat exchanger 37c.

  When the cogeneration apparatus is used, the engine 30 is driven, and the power generation apparatus 2 is driven by the drive rotary shaft 20 to generate power. When the engine 30 is driven, the engine 30 becomes hot and uses the exhaust heat of the engine 30. That is, when the first pump 33 is driven, the coolant that cools the engine 30 circulates in the circulation passage 32. For this reason, the heat of the engine 30 is transmitted to the coolant, and the overheating of the engine 30 is suppressed. When the second pump 38 is driven, the water in the hot water storage tank 39 flows through the hot water storage passage 37. At this time, the high temperature side coolant (engine coolant) of the first heat exchange passage 31 of the circulation passage 32 and the low temperature side water of the second heat exchange passage 36 of the hot water storage passage 37 exchange heat. As a result, the exhaust heat of the engine 30 is transmitted to the water in the hot water storage passage 37 via the coolant, and is stored in the hot water storage tank 39 as hot water. Therefore, the exhaust heat of the engine 30 is stored as thermal energy of hot water in the hot water tank 39 (heat utilization part).

  According to the present embodiment, as shown in FIG. 1, the inlet temperature sensor 101 that detects the water temperature on the inlet side (low temperature side) of the second heat exchange passage 36 in the heat exchanger 37 c and the second heat exchange passage 36. And an outlet temperature sensor 102 for detecting the water temperature on the outlet side (high temperature side). A supply passage 36 a for supplying tap water to the hot water storage tank 39 when the amount of water in the hot water storage tank 39 decreases is provided. A water supply valve 36c is provided in the supply passage 36a. When the water in the hot water tank 39 is insufficient, the water supply valve 36c is opened, and water is supplied to the hot water tank 39 through the supply passage 36a.

  FIG. 2 shows time measuring means for measuring the elapsed time at times other than the independent output operation. As shown in FIG. 2, it starts by turning on the power switch of the cogeneration power generator. First, the time count is set to 0 (step S2). Next, it is determined whether or not the self-sustained output operation is being performed (step S4). If the self-sustained output operation is being performed (YES in step S4), the time count is set to 0 (step S6). If the self-sustained output operation is being performed, the self-sustained output breaker 56 detects whether there is a leakage or short circuit in the self-sustained output system 5, and a detection signal from the self-sustained output breaker 56 is input to the control device 7. This is because it is not necessary to positively diagnose whether or not there is a conduction failure (leakage and short circuit) in the independent output system 5.

  If it is not in the independent output operation (NO in step S4), that is, the grid output operation is in progress or the cogeneration power generation device is stopped. The control device 7 determines whether or not a leakage is detected in the independent output system 5 (step S8). Next, the control device 7 determines whether or not a short circuit is detected in the independent output system 5 (step S10). If a leakage or short circuit is detected in the independent output system 5 (YES in step S8, YES in step S10), it is a failure of the independent output system 5, and until the energization failure diagnosis process for diagnosing the presence or absence of the failure is performed. Therefore, the control device 7 does not count the measurement time and returns to step S4. As described above, when a leakage or short circuit is detected in the self-sustained output system 5, since the detection signal of the energization failure detected by the breaker 56 is input to the control device 7, the control device 7 includes the first alarm device 201 and the first alarm device 201. 2 An alarm signal is output to the alarm device 202, and the first alarm device 201 and the second alarm device 202 issue an alarm.

  Further, if no leakage or short circuit is detected in the independent output system 5 (NO in step S8, NO in step S10), the control device 7 determines whether one hour has elapsed since the start of time measurement (step). S12). If 1 hour has elapsed since the start of measurement (YES in step S12), the control device 7 increments the time count by 1 (step S14). If 1 hour has not elapsed since the start of measurement (NO in step S12), the time count is not incremented by 1, and the process returns to step S4. Hereinafter, by repeating this flowchart, the control device 7 measures the time at times other than the self-sustained output operation of the cogeneration power generation device 2.

  According to the flowchart shown in FIG. 2, when the self-sustained output operation (including the self-sustained output operation in the diagnosis process) is performed, the time count (measurement time) is reset.

  FIG. 3 shows that the current situation of the power generator 2 is switched from the grid output operation to the self-sustained output operation when the measurement time has passed a predetermined time, and the self-sustained output operation is periodically and forcibly performed. 5 is a flowchart showing a diagnosis timing determination means for periodically performing a diagnosis process for detecting the presence or absence of an energization abnormality in FIG.

  As shown in FIG. 3, the control device 7 determines whether or not a leakage in the independent output system 5 has been detected (step S <b> 22). If an electric leakage is detected in the independent output system 5 (YES in step S22), it is a failure in the independent output system 5 and an energization failure has already occurred, so whether or not an energization failure in the independent output system 5 has occurred. There is no need to deliberately conduct the power failure diagnosis process. Therefore, the process returns to the main routine.

  If no leakage is detected in the independent output system 5 (NO in step S22), the control device 7 then determines whether a short circuit is detected in the independent output system 5 (step S24). If a short circuit is detected in the independent output system 5 (YES in step S24), it is a failure in the independent output system 5, and it is not necessary to perform the energization failure diagnosis process, so the process returns to the main routine. Note that when an energization abnormality (leakage or short circuit) in the independent output system 5 is detected by the independent output breaker 56, the energization abnormality signal detected by the independent output breaker 56 is input to the control device 7.

  In this case, as described above, since the detection signal of the energization failure detected by the self-supporting output breaker 56 is input to the control device 7, the control device 7 sends an alarm signal to the first alarm device 201 and the second alarm device 202. The first alarm device 201 and the second alarm device 202 issue an alarm.

  If a short circuit is not detected in the independent output system 5 (NO in step S24), the control device 7 determines whether or not the time count is less than a first threshold time T1 (for example, 145 hours) (step S26). If the time count is less than the first threshold time T1 (for example, 145 hours) (YES in step S26), the time for executing the energization failure diagnosis process has not yet arrived. Return to the main routine. The time of the first threshold time T1 is not limited to 145 hours and can be selected as appropriate.

  If the time count (elapsed time) is equal to or greater than the first threshold time T1 (for example, 145 hours) (NO in step S26), it is already time to execute a diagnostic process for diagnosing whether or not the self-sustained output system 5 is energized. It has arrived. For this reason, it is preferable to perform a diagnostic process. However, the diagnosis processing for the self-sustained output system 5 needs to perform self-sustained output operation, and it is necessary to intentionally stop the interconnected output operation that produces cost merit as a cogeneration power generation device. Therefore, the control device 7 determines whether or not the current operation status is a grid output operation (step S28).

  If the current operation status is not in the grid output operation (NO in step S28), that is, if the current operation status is in the independent output operation, the control device 7 performs the periodic diagnosis process for the independent output system 5. Is executed (step S36). In this case, the control device 7 diagnoses the presence or absence of an overcurrent and the presence or absence of a voltage abnormality in the independent output breaker 56.

  In addition, although the time count (elapsed time) has passed the first threshold time T1 and the time for executing the above-described diagnosis processing has already arrived, the current operation status is in the grid output operation. If there is (YES in step S28), the control device 7 does not execute the periodic diagnosis process of the independent output system 5. Then, the control device 7 determines whether or not the time count is less than a second threshold time T2 (for example, 168 hours, T2> T1) (step S32). The second threshold time T2 is not limited to 168 hours and can be selected as appropriate.

  As described above, according to the present embodiment, when the first threshold time T1 has elapsed and the time for executing the diagnostic process for diagnosing the presence or absence of the energization failure of the independent output system 5 has already arrived, If the current operation status of No. 2 is during the independent output operation, periodic diagnosis processing of the independent output system 5 is executed. However, if the current operation status is during the grid output operation, the periodic diagnosis process of the independent output system 5 is not executed. The reason for this is as follows. In other words, when the current operation state is during the interconnection output operation in which the power generation device 2 and the commercial power source 1 are linked, the original cost reduction function of the cogeneration power generation device is expressed, and the electric energy generated by the commercial power source 1 is reduced. Electric energy (power generation by the power generation device 2) and thermal energy (exhaust heat of the engine 30) by the cogeneration power generation device are used together well, and operations and the like are being performed with reduced running costs. This is because it is estimated and does not want to impair the running cost reduction effect in the cogeneration power generation device.

  As a result, even when the time count has passed the first threshold time T1 (for example, 145 hours), in other words, the time to execute the conduction failure diagnosis process for the independent output system 5 has already come. Even if the current operation status is during the grid output operation, the routine diagnosis process of the independent output system 5 is not executed and the process returns to the main routine.

  In other words, if the time count is less than the second threshold time (for example, 168 hours) (YES in step S32), it is time to execute the conduction failure diagnosis process for the independent output system 5. First, since the current operation status is during the interconnected output operation that produces cost merit, the routine returns to the main routine without executing the periodic diagnosis process of the independent output system 5.

  However, it is not preferable that the above-described diagnosis processing is not performed at all for a long time. Therefore, even if the current operation status is the grid output operation (YES in step S28), if the time count is equal to or greater than the second threshold time T2 (T2> T1, for example, 167 hours) (step S32). NO), even if the current operation status is during the interconnected output operation that produces cost merit, the control device 7 forcibly stops the interconnected output operation (step S34), and performs the independent output operation. This is forcibly executed, and periodic diagnosis processing of the independent output system 5 is executed (step S36). In this case, the control device 7 outputs a command for forcibly switching from the grid output operation to the self-sustained output operation to the switching unit 6. The time required for the periodic diagnosis process is about 5 to 20 minutes and about 7 to 13 minutes depending on the type of apparatus. However, it is not limited to this.

  According to this embodiment, it is possible to execute a diagnosis process (step S36) for diagnosing the presence or absence of an energization abnormality of the independent output system 5 while obtaining the running cost reduction effect by the cogeneration power generator.

  FIG. 4 shows a flowchart for detecting the presence or absence of electric leakage and a short circuit in the independent output system 5. The control device 7 determines whether or not the self-sustained output operation is being performed (step S50). If it is not in the independent output operation (NO in step S50), the process returns to the main routine. If the self-sustained output operation is being performed (YES in step S50), it is determined whether or not a leakage is detected in the self-sustained output system 5 (step S52). If the leakage in the independent output system 5 is detected (YES in step S52), it indicates a failure in the independent output system 5, so that a signal indicating an abnormal leakage in the independent output system 5 is output (step S54). An instruction signal for stopping the operation is output (step S56), and the process returns to the main routine.

  As a result of the determination in step S52, if no leakage is detected in the independent output system 5 (NO in step S52). A command for canceling the leakage abnormality notification in the independent output system 5 is output to the first alarm device 201 (step S58).

  Next, it is determined whether or not a short circuit is detected in the independent output system 5 (step S60). If a short circuit is detected in the self-sustained output system 5 (YES in step S60), the controller 7 outputs a short-circuit abnormality alarm signal in the self-supporting output system 5 to the second alarm device 202 because of a failure ( In step S62), an alarm is output by the second alarm device 202, and an instruction signal for stopping the self-sustained output operation is output (step S56). If the result of determination in step S60 is that a short circuit has not been detected in the independent output system 5 (NO in step S60). A command to cancel the short-circuit abnormality notification in the independent output system 5 is output to the second alarm device 202 (step S64), and the process returns to the main routine.

  As described above, according to the present embodiment, the presence or absence of a power supply abnormality (leakage and short circuit) in the self-sustained output system 5 is periodically diagnosed without waiting for a periodic inspection performed by a manager. That is, an energization abnormality (leakage and short circuit) in the self-sustained output system 5 electrically connected to the cogeneration power generator is diagnosed at a high frequency with a period shorter than the period of the regular periodic inspection. For this reason, the reliability with respect to the independent output system 5 increases.

  In addition, according to the present embodiment, even if a leakage or short circuit is detected in the independent output system 5 as described above, it is an abnormality in the independent output system 5 that is very rarely used, and is used on a daily basis. Since it is not an abnormality in the grid 4, the grid output operation in the grid output system 4 is possible. For this reason, the influence which it has on a daily operation which is often connected output operation is reduced.

  However, when it is diagnosed that an energization abnormality occurs in the independent output system 5, the control device 7 issues an alarm with the first alarm device 201 and the second alarm device 202. Abnormalities can be detected early and the user can recognize them early. When it is diagnosed that an electric leakage or a short circuit has occurred in the self-sustained output system 5, it is repaired at an early stage at the next maintenance or by a manager who has been informed. Therefore, the presence or absence of leakage or short circuit in the self-sustained output system 5 is diagnosed at an early stage and repaired at an early stage as compared with the conventional technique in which periodic inspection is performed at regular intervals. For this reason, even if the commercial power source 1 has a power failure or the like, it is possible to perform independent output operation without leakage or short circuit in the independent output system 5 even when shifting to independent output operation. Is avoided.

  According to the present embodiment, when it is diagnosed that leakage or short circuit is recognized in the independent output system 5, the control device 7 outputs a signal for prohibiting the independent output operation in the independent output system 5 (step S56, independent output). Driving prohibition means). As a result, the self-sustained output system 5 in which a leakage or short circuit has occurred does not operate and is safe. Further, according to the present embodiment, as described above, the diagnosis of the energization abnormality (leakage and short circuit) in the independent output system 5 is basically performed when the interconnection output operation is not performed (NO in step S28). As a result, the influence on the grid output operation that is easily performed on a daily basis is reduced.

(Embodiment 2)
FIG. 5 shows a second embodiment. The present embodiment has basically the same configuration and operational effects as the first embodiment. The present embodiment can be applied mutatis mutandis to FIGS. The flowchart shown in FIG. 5 basically approximates the flowchart shown in FIG. In FIG. 5, as in the case of the first embodiment, if no short circuit is detected in the independent output system 5 (NO in step S24), the control device 7 sets the time count to the first threshold time T1 (for example, 145). It is determined whether it is less than (time) (step S26). If the time count is less than the first threshold time T1 (for example, 145 hours) (YES in step S26), it is not yet time to execute the energization failure diagnosis process, so the energization failure diagnosis process is executed. Return to the main routine.

  If the time count (elapsed time) exceeds the first threshold time T1 (for example, 145 hours) (NO in step S26), the time for executing the energization failure diagnosis process for the independent output system 5 has already arrived. . Therefore, the control device 7 determines whether or not the current operation status is a grid output operation (step S28). If the current operation status is not during the grid output operation (NO in step S28), the cost advantage of the grid output operation is not impaired, and therefore the periodic diagnosis process of the independent output system 5 is executed ( Step S36).

  Further, if the time count (elapsed time) is equal to or greater than the first threshold time T1 (for example, 145 hours), even if the current operation status is during the interconnected output operation that produces a cost advantage (YES in step S28). The control device 7 forcibly stops the interconnected output operation (step S34), forcibly performs the independent output operation, and executes the periodic diagnosis process of the independent output system 5 (step S36). In this case, the control device 7 outputs a command for forcibly switching from the grid output operation to the self-sustained output operation to the switching unit 6.

(Embodiment 3)
FIG. 6 shows a third embodiment. The present embodiment has basically the same configuration and operational effects as the first embodiment. The present embodiment can be applied mutatis mutandis to FIGS.

  According to the present embodiment, the control device 7 functions as hot water thermal energy detection means for directly or indirectly detecting the thermal energy of the hot water in the hot water tank 39. An inlet temperature sensor 101 for detecting the water temperature on the inlet side of the second heat exchange passage 36 in the heat exchanger 37c shown in FIG. 1 and an outlet temperature sensor 102 for detecting the water temperature on the outlet side of the second heat exchange passage 36 are provided. It has been.

  The control device 7 functions as hot water thermal energy detection means, detects the inlet temperature Ti by the inlet temperature sensor 102, detects the outlet temperature To by the outlet temperature sensor 102 of the second heat exchange passage 36, and detects the inlet temperature Ti and the outlet temperature. A temperature difference ΔT (To−Ti) with To is obtained. Here, when the condition that the inlet temperature Ti of the inlet temperature sensor 102 exceeds the threshold temperature Tr and the condition that the temperature difference ΔT is smaller than the threshold temperature difference ΔTx are satisfied, the hot water thermal energy detection means The functioning control device 7 determines that the thermal energy of the hot water in the hot water storage tank 39 is large, and sets a hot water flag. When the hot water flag is set, it means that the thermal energy of the hot water in the hot water storage tank 39 is larger than the threshold energy, the hot water in the hot water storage tank 39 consumes less, and the hot water in the hot water storage tank 39 seems to be excessive. It means that. The advantage of the cogeneration generator is that hot water can be used in addition to electric power. If it is a time zone when the consumption of hot water in the hot water storage tank 39 is large, the advantage of the cogeneration power generation device is obtained well. If the consumption time of the hot water in the hot water storage tank 39 is small, the advantage is that the advantage of the cogeneration power generation device is not obtained well. Accordingly, the warm water flag is set (warm water flag ON) is a time zone in which the advantage of the cogeneration power generation apparatus is not obtained well, and during this time, it is preferable to perform the diagnosis processing of the independent output system 5.

  The flowchart shown in FIG. 6 basically approximates the flowchart shown in FIG. However, step S30 is provided between step S28 and step S32. In step S30, control device 1 determines whether or not the hot water flag is set, that is, whether or not the thermal energy of the hot water in hot water tank 39 is greater than the threshold energy (step S30).

  If the hot water flag is set (warm water flag ON), the hot water in the hot water tank 39 has a surplus flavor even if the current operation status is in the grid output operation (YES in step S28). The impact on the running cost of the power generator is considered to be small. Therefore, the control device 7 forcibly stops the interconnection output operation (step S34), forcibly performs the independent output operation, and executes the periodic diagnosis process of the independent output system 5 (step S36). In this case, the control device 7 outputs a command for forcibly switching from the grid output operation to the self-sustained output operation to the switching unit 6. If the hot water flag is not set, the process proceeds to step S32.

  FIG. 7 shows a hot water flag determination flowchart for determining whether or not the thermal energy of the hot water in the hot water tank 39 is large. As shown in FIG. 7, it is determined whether or not the engine 30 is in operation (step S52). If in operation, the condition that the inlet temperature Ti of the inlet temperature sensor 102 exceeds the threshold temperature Tr (YES in step S54) and the temperature difference ΔT (To−Ti) between the inlet temperature Ti and the outlet temperature To are If the condition that the temperature difference is smaller than the threshold temperature difference ΔTx is satisfied (YES in step S56), it is estimated that the amount of hot water in the hot water tank 39 is small and the hot water in the hot water tank 39 is high and large. Therefore, the warm water flag is set (ON, step S58), and the process returns.

  Further, when the engine 30 is not in operation (NO in step S52), when the condition that the inlet temperature Ti of the inlet temperature sensor 102 exceeds the threshold temperature Tr is not satisfied (NO in step S54), the inlet temperature Ti When the condition that the temperature difference ΔT between the outlet temperature To and the outlet temperature To is smaller than the threshold temperature difference ΔTx is not satisfied (NO in step S56), the hot water flag is lowered (OFF, step S60), and the process returns.

  FIG. 8 shows another example of a hot water flag determination flowchart for determining whether or not the thermal energy of the hot water in the hot water tank 39 is large. As shown in FIG. 8, it is determined whether or not the first pump 33 serving as a cooling water pump that takes away the heat of the engine 30 that becomes high temperature during operation is in operation (step S62). It may be determined whether the pump 38 is operating instead of the pump 33. If the first pump 33 is not in operation (NO in step S62), it is estimated that the thermal energy of the hot water stored in the hot water tank 39 is low, so the hot water flag is lowered (OFF, step S72) and the process returns. . When the engine outlet temperature Te which is the temperature on the outlet side of the engine 30 exceeds the engine overheat avoidance operation start temperature Tes (YES in step S64), the engine 30 is estimated to be overheated and stored in the hot water tank 39. Since the warm water energy of the warm water is large, the warm water flag is set (ON, step S66) and the process returns. Here, the engine overheat avoidance operation means that the engine 30 is operated so as to avoid overheating of the engine 30, for example, the output of the engine 30 is reduced, the amount of cooling water of the engine 30 is increased, It means the operation of lowering the cooling water temperature of 30. The engine outlet temperature Te is detected by a temperature sensor 30r installed on the outlet side of the engine 30 in the circulation passage 32 through which the engine coolant (engine coolant) flows. Therefore, the engine outlet temperature Te corresponds to the engine coolant outlet temperature.

  When the engine outlet temperature Te does not exceed the engine overheat avoidance operation start temperature Tes (NO in step S64), the process proceeds to step S68. In step S68, when the engine outlet temperature Te is lower than the engine overheat avoidance operation stop temperature Tee (YES in step S68), since the engine 30 is not in an overheated state, the warm water flag is lowered (OFF, step S70) and the process returns. As shown in FIG. 9, hysteresis is shown between the engine outlet temperature Te and the hot water flag.

  FIG. 10 shows another example of the warm water flag determination flowchart. As shown in FIG. 10, it is determined whether or not the engine 30 is in operation (step S82). If the engine 30 is not in operation (NO in step S82), since the hot water energy in the hot water tank 39 is small, the hot water flag is lowered (OFF, step S88), and the process returns. If the engine 30 is in operation, it is determined whether or not the hot water tank temperature contact 39r is ON (step S84). If the hot water tank temperature contact 39r is ON (YES in step S84), the hot water stored in the hot water tank 39 is high because the hot water stored in the hot water tank 39 is high, so the hot water flag is set. (ON, step S86), return. Here, the hot water tank temperature contact point 39r is provided in the hot water tank 39 so as to detect the temperature of the hot water in the hot water tank 39, and is turned on if the temperature of the hot water stored in the hot water tank 39 is high. The If the hot water tank temperature contact 39r is not ON (NO in step S84), the temperature of the hot water in the hot water tank 39 is low, and the thermal energy of the hot water in the hot water tank 39 is not sufficient, so the hot water flag is lowered (OFF). Step S88), and returns.

  In other words, the inlet temperature sensor 101 of the second heat exchange passage 36 and the outlet temperature sensor of the second heat exchange passage 36 are used to detect the magnitude of the hot water thermal energy in the hot water tank 39 as in the present embodiment described above. 102 may be provided as hot water thermal energy detection means. Furthermore, the present invention is not limited to this, and a hot water storage tank temperature contact 39r that is a temperature sensor for detecting the temperature of hot water stored in the hot water storage tank 39 is provided as hot water thermal energy detection means, and the hot water storage tank detected by the hot water storage tank temperature contact 39r. The magnitude of the hot water thermal energy in the hot water tank 39 may be detected based on the temperature of the hot water 39 itself.

The present invention is not limited to the embodiment described above and shown in the drawings, and a motor generator, an inverter that generates an alternating current by supplying a direct current, and the like can be considered as a power generation unit, and an internal combustion engine as a drive unit An engine, a steam engine, and the like are conceivable, and an absorption air conditioner, a decicount air conditioner, and the like are conceivable as the heat utilization unit, and can be implemented with appropriate modifications within a range not departing from the gist. The following technical idea can also be grasped from the above description.
[Additional Item 1]
A power generation device capable of performing an interconnected output operation that is connected to a commercial power source and supplies power to the interconnected output system and a self-sustained output operation that supplies power to the independent output system, and the power generation device is driven so that the power generation device generates power A drive unit that performs heat, a heat utilization unit that uses thermal energy generated in the drive unit, a switching unit that switches between the interconnected output operation and the independent output operation, and detection of the presence or absence of an energization abnormality in the independent output system In the cogeneration power generation apparatus comprising the energization abnormality detection means for performing the diagnosis, the diagnosis timing determination means for determining the timing for periodically performing the diagnostic process for detecting the presence or absence of the energization abnormality in the independent output system is provided, The utilization unit includes a hot water storage tank that stores hot water heated by the drive unit that is operated by supplying fuel, and the thermal energy of the hot water in the hot water storage tank The hot water thermal energy detection means for directly or indirectly detecting the hot water thermal energy in the hot water tank detected by the hot water thermal energy detection means has a threshold value. When it exceeds, it determines with having reached the timing which implements the said diagnostic process, The cogeneration power generation apparatus characterized by the above-mentioned. In this case, it is advantageous to suppress the occurrence of adverse effects due to poor energization in the independent output system.

  The present invention can be used for, for example, a cogeneration power generation device used in industry, business shops, general households, and the like.

It is a conceptual diagram of the cogeneration power generation apparatus electrically connected to the commercial power source. It is a flowchart which shows a time measurement means. It is a flowchart which shows a diagnostic timing determination means. It is a flowchart which determines the electricity supply abnormality in a self-supporting output driving | operation. 12 is a flowchart illustrating a diagnosis timing determination unit according to the second embodiment. 10 is a flowchart illustrating a diagnosis timing determination unit according to the third embodiment. It is a flowchart which shows the conditions which raise a warm water flag. It is a flowchart which concerns on the other example which shows the conditions which raise a warm water flag. It is a figure which shows the hysteresis between a warm water flag and engine exit temperature. It is a flowchart which concerns on another example which shows the conditions which raise a warm water flag.

Explanation of symbols

  1 is a commercial power source, 2 is a power generation device, 3 is a drive unit, 39 is a hot water storage tank (heat utilization unit), 37 is a hot water storage passage, 4 is an interconnection output system, 40 is a main interconnection output path, 42 is a main breaker, 46 denotes a sub-breaker, 5 denotes an independent output system, 50 denotes a main independent output path, 56 denotes an independent output breaker (energization abnormality detection means), and 7 denotes a control device (diagnosis timing determination means).

Claims (4)

A power generation device capable of performing an interconnected output operation for supplying power to the interconnected output system in conjunction with a commercial power supply and an independent output operation for supplying power to the independent output system;
A drive unit that drives the power generation device to generate power with the power generation device;
A heat utilization unit that utilizes thermal energy generated in the drive unit;
A switching unit for switching between the interconnected output operation and the independent output operation;
In the cogeneration power generation apparatus comprising an energization abnormality detection means for detecting the presence or absence of an energization abnormality in the independent output system,
A diagnostic timing determination means for determining a timing for periodically performing a diagnostic process for detecting the presence or absence of energization abnormality in the independent output system;
The diagnosis timing determination means includes
Time measuring means for measuring elapsed time at times other than the independent output operation is provided, and when the elapsed time measured by the time measuring means exceeds a first threshold time, the timing for executing the diagnostic processing A cogeneration power generator characterized by determining that it has arrived. A power generation device capable of performing an interconnected output operation for supplying power to the interconnected output system in conjunction with a commercial power supply and an independent output operation for supplying power to the independent output system;
A drive unit that drives the power generation device to generate power with the power generation device;
A heat utilization unit that utilizes thermal energy generated in the drive unit;
A switching unit for switching between the interconnected output operation and the independent output operation;
In the cogeneration power generation apparatus comprising an energization abnormality detection means for detecting the presence or absence of an energization abnormality in the independent output system,
A diagnostic timing determination means for determining a timing for periodically performing a diagnostic process for detecting the presence or absence of energization abnormality in the independent output system;
The diagnosis timing determination means includes
It has a time measuring means for measuring the elapsed time at times other than the independent output operation,
The diagnosis timing determination means includes
When the elapsed time measured by the time measuring means exceeds a first threshold time, it is determined that the timing for performing the diagnostic processing has been reached if the interconnection output operation is not being performed,
If it is during the said grid output operation, it determines with not having reached | attained the timing which implements the said diagnostic process, The cogeneration power generator characterized by the above-mentioned. A power generation device capable of performing an interconnected output operation for supplying power to the interconnected output system in conjunction with a commercial power supply and an independent output operation for supplying power to the independent output system;
A drive unit that drives the power generation device to generate power with the power generation device;
A heat utilization unit that utilizes thermal energy generated in the drive unit;
A switching unit for switching between the interconnected output operation and the independent output operation;
In the cogeneration power generation apparatus comprising an energization abnormality detection means for detecting the presence or absence of an energization abnormality in the independent output system,
A diagnostic timing determination means for determining a timing for periodically performing a diagnostic process for detecting the presence or absence of energization abnormality in the independent output system;
The diagnosis timing determination means includes
It has a time measuring means for measuring the elapsed time at times other than the independent output operation,
The diagnosis timing determination means includes
When the elapsed time measured by the time measuring means exceeds a first threshold time, it is determined that the timing for performing the diagnostic processing has been reached if the interconnection output operation is not being performed,
If the elapsed output time measured by the time measuring means exceeds the second threshold time longer than the first threshold time, the timing for executing the diagnosis process is reached if the interconnection output operation is in progress. When the elapsed time measured by the time measuring means does not exceed the second threshold time, the diagnosis is exceeded even though the first threshold time is exceeded. It determines with not having reached the timing which performs a process, The cogeneration power generation apparatus characterized by the above-mentioned. In one of Claims 1-3, the said heat utilization part is equipped with the hot water storage tank which stores the warm water warmed by the said drive part operated by supply of fuel,
There is provided hot water thermal energy detection means for directly or indirectly detecting the thermal energy of the hot water in the hot water tank,
The cogeneration generator according to claim 1, wherein the diagnosis timing determination means determines that the timing for performing the diagnosis process has been reached when the thermal energy of the hot water in the hot water storage tank exceeds a threshold value.

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