JP2017050929A - Thermoelectric cogeneration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermoelectric cogeneration system capable of performing diagnosis processing for diagnosing an installation state of a pair of current detection parts while attaining reduction of power consumption.SOLUTION: As diagnosis processing for diagnosing an installation state of a pair of current detection parts installed in each of a U-phase wire U and a V-phase wire V of a single-phase three-wire commercial power source 7, regarding each of a U-phase side electric load Eu and a V-phase side electric load Ev, if a change of a current value generated by causing the load to act cannot be detected from a current value of any one of the pair of current detection parts D, in the mode where the load is changed to a load increase side, an operation control part 6 increases the load from a preset small load to a preset large load step by step. If the change of the current value generated by causing the load to act can be detected from the current value of any one of the pair of current detection parts D, processing for determining the installation state of the pair of current detection parts D based on a result of the detection is executed.SELECTED DRAWING: Figure 2

Description

  The present invention includes a power generation unit interconnected with a single-phase three-wire commercial power source, a pair of current detection units respectively installed on the U-phase line and the V-phase line of the commercial power source, and an operation An operation control unit for controlling, and in a state where the operation control unit stops the operation of the power generation unit, electric power is supplied from the U-phase side electric load supplied with power from the U-phase line and the V-phase line. The present invention relates to a combined heat and power system configured to execute a diagnosis process for diagnosing an installation state of a pair of current detection units by selectively applying a supplied V-phase side electric load.

Such a combined heat and power system enables the installation control state of the pair of current detection units to be diagnosed by the operation control unit executing diagnosis processing.
That is, for example, each of the pair of current detection units detects a current flowing from the commercial power source side toward the load side as positive, and detects a current flowing from the power generation unit side to the commercial power source side as negative. In this case, if the mounting direction of the pair of current detection units is reversed, plus and minus are reversed, so it is diagnosed whether the mounting direction of the pair of current detection units is properly installed. In addition, a pair of current detection units are properly installed on the U-phase line and the V-phase line, and the current detection unit that detects the current of the U-phase line detects the current of the U-phase line as appropriate, and V The current detection unit for detecting the current of the phase line can diagnose whether or not the current of the V-phase line is detected as appropriate.

  As a conventional example of such a combined heat and power system, the power generation unit is provided with a U-phase heater means connected to the U-phase line and a V-phase heater means connected to the V-phase line as heater means for surplus power consumption. Is used to perform diagnostic processing while using the U-phase heater means as the U-phase side electric load and the V-phase heater means as the V-phase side electric load (for example, Patent Document 1). reference.).

That is, in Patent Document 1, based on detection information of a pair of current detection units installed on each of the U-phase line and the V-phase line of the commercial power supply, the power generated by the power generation unit flows to the commercial power supply side. In order to avoid the so-called reverse power flow, the U-phase heater means and the V-phase heater means as the heater means for surplus power consumption are operated, and in the diagnosis process, as the heater means for surplus power consumption The U-phase heater means and the V-phase heater means are used as the U-phase side electric load and the V-phase side electric load.
Patent Document 1 describes that each of the U-phase heater means and the V-phase heater means is composed of three heaters. In the diagnosis process, the U-phase heater means and the V-phase heater means are designated as U-phase. When used as a side electric load or a V-phase side electric load, it is described that at least one or two or more heaters are operated.

Incidentally, although not described in Patent Document 1, in general, the detection information of the pair of current detection units is also used to obtain the power usage amount using the power of the commercial power source, and the obtained power usage amount. However, it is displayed on a remote controller or the like that commands operation information of the combined heat and power system.
The power consumption is obtained as a value obtained by adding the integrated value of the product of the voltage of the U-phase line and the current of the U-phase line and the integrated value of the product of the voltage of the V-phase line and the current of the V-phase line. Therefore, the current detection unit that detects the current of the U-phase line detects the current of the U-phase line as appropriate, and the current detection unit that detects the current of the V-phase line properly detects the current of the V-phase line. It needs to be detected.

  In Patent Document 1, instead of operating the U-phase heater unit and the V-phase heater unit, the amount of power supplied to the U-phase line and the V-phase line is changed while increasing or decreasing the generated power of the power generation unit. It is also described that the pair of current detection units detect whether the U-phase line and the V-phase line are properly installed. For diagnostic processing, the generated power of the power generation unit is changed. There is waste that must be done.

Further, in Patent Document 1, the power generation unit is configured to include a generator driven by an engine, but the power generation unit includes a reforming unit that reforms a fuel gas such as city gas, In some cases, the fuel cell is configured to include a fuel cell that generates electricity using the hydrogen-containing gas from the reforming unit as fuel (see, for example, Patent Document 2).
Incidentally, in Patent Document 2, similarly to Patent Document 1, it is described that an electric heater is provided as a heater means for surplus power consumption.

JP 2002-286785 A JP 2005-69667 A

  In Patent Document 1, when the U-phase heater means and the V-phase heater means are used as the U-phase side electric load and the V-phase side electric load, the U-phase side electric load and the V-phase side electric load are assumed to be loads of a certain size. Therefore, there is a possibility that power consumption for determining the installation state of the pair of current detection units increases.

  That is, when a U-phase side electrical load or a V-phase side electrical load is a constant load, a larger current flows when an electric device with large power consumption is connected to the commercial power source. Since the range in which the current pulsates due to disturbance increases, if the U-phase side electrical load or the V-phase side electrical load is small, a small change in current value generated by applying the small load is applied to a pair of current detection units. It becomes difficult to detect by any one of the current values.

  Therefore, when the U-phase side electrical load and the V-phase side electrical load are set to constant loads, the U-phase side electrical load and the V-phase side electrical load are set as large loads in the diagnosis process. The change in the current value generated by the action is detected by the current value of one of the pair of current detection units.

  However, in this case, since the U-phase side electric load and the V-phase side electric load are always made large loads, a smaller current flows when an electric device with low power consumption is connected to the commercial power supply. Therefore, even if the U-phase side electric load or the V-phase side electric load acts as a small load, the small current value corresponding to the acted load is reduced. Although the change can be detected by the current value of one of the pair of current detection units, there is a disadvantage in that the U-phase side electric load and the V-phase side electric load are caused to act as large loads.

  That is, in the diagnosis process, when the U-phase side electrical load and the V-phase side electrical load are set to a certain large load, a smaller current flows when an electrical device with low power consumption is connected to the commercial power supply. In this case, since a large load is applied as the U-phase side electric load and the V-phase side electric load, there is a problem that the power consumption for the diagnostic processing increases.

  In addition, when using the heater means connected to the U-phase side and the heater means connected to the V-phase side as the U-phase side electric load and the V-phase side electric load, by heating hot water unnecessarily, There is also a risk that the equipment will be heated unnecessarily, causing thermal damage.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a combined heat and power system capable of performing a diagnostic process for diagnosing the installation state of a pair of current detection units while reducing power consumption. There is.

A combined heat and power system according to the present invention includes a pair of current detection units separately installed on a power generation unit interconnected with a single-phase three-wire commercial power source and a U-phase line and a V-phase line of the commercial power source. And an operation control unit for controlling operation,
The operation control unit selects a U-phase side electric load supplied with power from the U-phase line and a V-phase side electric load supplied with power from the V-phase line in a state where the operation of the power generation unit is stopped. And a combined heat and power system configured to execute a diagnostic process for diagnosing the installation state of the pair of current detectors, the characteristic configuration is:
The operation control unit, as the diagnosis process,
For each of the U-phase side electrical load and the V-phase side electrical load, when a change in current value generated by applying a load cannot be detected from the current value of one of the pair of current detection units, In the form of changing the load from the small load to the large set load, and the change in the current value generated by applying the load is one of the pair of current detection units. When the current value can be detected from the current value, a process for determining the installation state of the pair of current detection units based on the detection result is performed.

  According to the above characteristic configuration, in the diagnosis process, first, one of the U-phase side electric load and the V-phase side electric load is caused to act as a set small load. And when the change of the current value generated by causing one of the U-phase side electric load and the V-phase side electric load to act as a set small load can be detected from the current value of one of the pair of current detection units, Based on the detection result, the installation state of the pair of current detection units is determined.

  In addition, when a change in the current value generated by causing one of the U-phase side electrical load and the V-phase side electrical load to act as a set small load cannot be detected from the current value of one of the pair of current detection units, One of the U-phase side electric load and the V-phase side electric load is changed to the load increasing side. Then, a change in the current value when one of the increased U-phase side electrical load and V-phase side electrical load is applied is detected from the current value of one of the pair of current detection units, and based on the detection result The installation state of the pair of current detection units is determined.

  Next, the other of the U-phase side electric load and the V-phase side electric load is caused to act as a set small load. And, when the change of the current value generated by causing the other of the U-phase side electric load and the V-phase side electric load to act as a set small load can be detected from the current value of one of the pair of current detection units, Based on the detection result, the installation state of the pair of current detection units is determined.

  In addition, when the change in the current value generated by causing the other of the U-phase side electrical load and the V-phase side electrical load to act as a set small load cannot be detected from the current value of one of the pair of current detection units, The other of the U-phase side electric load and the V-phase side electric load is changed to the load increasing side. Then, a change in the current value when the other of the increased U-phase side electrical load and V-phase side electrical load is applied is detected from the current value of one of the pair of current detection units, and based on the detection result The installation state of the pair of current detection units is determined.

  It should be noted that the detection of a change in the current value when the U-phase side electrical load or the V-phase side electrical load is applied is detected by one of the pair of current detection units. This means that a change in the current value corresponding to the magnitude is detected by one of the pair of current detectors.

  That is, for example, when a small current flows by connecting a plurality of electric devices with low power consumption to a commercial power supply, the range in which the current pulsates due to disturbance is reduced. Even if the U-phase side electrical load and the V-phase side electrical load to be applied are small loads, a pair of current detections are performed for changes in the current value generated by applying the small U-phase side electrical load and V-phase side electrical load. Therefore, the U-phase side electric load and the V-phase side electric load are set to relatively small loads.

  In addition, for example, when a large current flows by connecting a plurality of power devices with large power consumption to a commercial power supply, the range in which the current pulsates due to disturbance increases, so in diagnosis processing, If the U-phase side electrical load and the V-phase side electrical load to be applied are small loads, a small change in the current value generated by applying the U-phase side electrical load and the V-phase side electrical load is applied to any of the pair of current detection units. In this case, the U-phase side electrical load and the V-phase side electrical load are increased and set to a relatively large load.

  As described above, when a smaller current flows when an electrical device with low power consumption is connected to the commercial power supply, the U-phase side electrical load and the V-phase side electrical load can be reduced, As a result, it is possible to reduce power consumption in the diagnosis process.

  Therefore, according to this characteristic configuration, the diagnosis process for diagnosing the installation state of the pair of current detection units is performed while reducing the power consumption by the U-phase side electric load and the V-phase side electric load that are acted on in the diagnosis process. be able to.

Further features of the combined heat and power system according to the present invention are as follows:
The operation control unit selects the U-phase side electrical load and the V-phase side electrical load based on an integrated current value obtained by integrating the current values detected by each of the pair of current detection units in the diagnosis process. It is the point which is comprised so that the change of the electric current value which generate | occur | produces when it makes it act automatically may be detected.

According to the above characteristic configuration, in the diagnosis process, the U-phase side electric load and the V-phase side electric load are selectively operated based on the integrated current value obtained by integrating the current values detected by the pair of current detection units. The change of the current value generated when it is made to be detected is detected.
Therefore, for example, the change in the current value that occurs when the U-phase side electrical load and the V-phase side electrical load are selectively applied is detected by the instantaneous value of the current value detected by each of the pair of current detection units. It is possible to detect appropriately while excluding the influence of disturbance rather than the case of doing.

Further features of the combined heat and power system according to the present invention are as follows:
Changes in the current value generated when the operation control unit causes the U-phase side electrical load and the V-phase side electrical load to act on the set large load in the diagnosis process. Is not detected by any one of the pair of current detection units, it is configured to determine that the state is abnormal.

According to the above characteristic configuration, when the U-phase side electric load and the V-phase side electric load are each acted with the load increased to a set large load, a change in the current value due to the action is not detected. Is determined to be abnormal.
Therefore, for example, when it is determined that the state is abnormal, it is possible to notify the user by an alarm or the like, so that the user can properly make the pair of current detection units each of the U-phase line and the V-phase line of the commercial power supply. It is possible to take measures to eliminate the cause of the abnormal condition, such as confirming whether each is installed separately.

Schematic configuration diagram of cogeneration system Electric system diagram of cogeneration system Flow chart showing diagnostic processing Flow chart showing diagnostic processing Flowchart showing test processing according to the second embodiment

[First Embodiment]
Hereinafter, a combined heat and power system according to a first embodiment of the present invention will be described with reference to the drawings.
(Overall configuration of the combined heat and power unit)
As shown in FIG. 1, the combined heat and power system includes a combined heat and power supply unit H including a power generation unit Ha and a heat source unit Hb as an exhaust heat recovery and consumption unit, and the heat source unit Hb receives exhaust heat from the power generation unit Ha. A hot water storage tank 1 for storing the recovered hot water and an auxiliary heat source machine 2 for combustion using fuel gas such as city gas are provided.

The power generation unit Ha includes a fuel cell 4 that generates power using hydrogen gas (hydrogen-containing gas) supplied from the reforming unit K that performs steam reforming of the raw material gas through the hydrogen gas supply path 3. A supply interrupt valve 3A for interrupting the supply of the raw material gas to the reforming section K is provided.
The fuel cell 4 is configured by stacking cells including a fuel electrode 4n and an oxygen electrode 4s, and cooling water flows between the fuel electrode 4n and the oxygen electrode 4s of adjacent cells. A flow passage 4d is provided.

  The reforming section K is supplied with city gas or the like as a raw material gas, and although not shown, the reforming section K includes a desulfurizer that desulfurizes the supplied raw material gas, and a desulfurization process. A reformer that generates hydrogen-containing gas by reforming the desulfurization gas from the steam with steam, and carbon monoxide contained in the reformed gas reformed by the reformer is converted to carbon dioxide. A transformer to be processed and a carbon monoxide selective oxidizer that selectively oxidizes carbon monoxide contained in the shift gas that has been shift-processed by the shift converter are provided. The hydrogen gas (hydrogen-containing gas) generated by the carbon monoxide selective oxidizer is supplied to the fuel cell 4 through the hydrogen gas supply path 3 as described above.

Cooling water circulation path 5A for recovering heat generated by the fuel cell 4 with cooling water, hot water circulation path 5B for circulating hot water between the power generation unit Ha and the heat source unit Hb, and cooling water for circulation through the cooling water circulation path 5A And a heat exchanging section 5C for exchanging heat between the hot water circulating in the hot water circulation path 5B.
The cooling water circulation path 5A is provided with a cooling water circulation pump Pa and a cooling water storage tank Q, and the hot water circulation path 5B collects surplus electric power generated by the hot water circulation pump Pb and the fuel cell 4 in place of heat. A surplus power heater portion G is provided.

  Then, hot water in the hot water circulation path 5B that circulates hot water between the power generation section Ha and the heat source section Hb is heated with cooling water that circulates in the cooling water circulation path 5A, and the exhaust heat of the power generation section Ha is converted into the heat source section Hb. The heat source unit Hb is configured to perform general hot water supply, hot water supply hot water, heating operation, and reheating operation, and when the amount of heat is insufficient, the auxiliary heat source unit 2 is operated. The details are described later.

An operation control unit 6 that controls the operation of the power generation unit Ha is provided on the power output side of the fuel cell 4.
The operation control unit 6 is equipped with an inverter for grid connection, and is configured to set the generated power of the fuel cell 4 to the same voltage and the same frequency as the received power received from the commercial power source 7.
Further, as will be described in detail later, the operation control unit 6 consumes the surplus power heater unit G so that the surplus power generated by the fuel cell 4 is consumed by the surplus power heater unit G so that a reverse power flow does not occur. It is configured to regulate power.

  The commercial power source 7 is a single-phase three-wire 100 / 200V. The distribution board 8 to which the commercial power supply 7 is connected is connected to a received power supply line 9, and the electric power 10 from the commercial power supply 7 is received through the received power supply line 9 by an electric load 10 such as a television, a refrigerator, or a washing machine. It is comprised so that it may be supplied to.

  In addition, the power generation unit Ha is connected to the distribution board 8 so that the generated power from the fuel cell 4 is supplied to the electric load 10 via the received power supply line 9.

The heat source unit Hb is provided with a terminal side control unit 11 that controls the operation of the heat source unit Hb, and the thermoelectric control unit C that controls the operation of the combined heat and power supply unit H includes the operation control unit 6 and the terminal side control unit 11. It consists of and.
The operation control unit 6 and the terminal-side control unit 11 are connected via a communication line L, and are configured to be able to communicate various information. In addition, the operation control unit 6 and the terminal-side control unit 11 start operation. A remote controller R for instructing various types of information such as a command and an operation stop command is provided in a form connected to the communication line L.

(Electric system)
As shown in FIG. 2, a U-phase line U, a V-phase line V, and a neutral line O of the commercial power supply 7 are drawn into the distribution board 8.
In the distribution board 8, a limiter (current limiter) 12 for limiting the load current to a contracted set value or less, a main breaker (earth leakage breaker) 13, and a plurality of branch breakers connecting the above-described received power supply line 9 are connected. 14 and an associated breaker 15 for connecting the operation control unit 6 are provided.
In addition, in FIG. 2, although the form which supplies 100V electric power with respect to the electric load 10 is illustrated, you may make it supply 200V electric power with respect to the electric load 10 as needed.

The power generation unit Ha is provided with a power supply terminal block 16 connected to the operation control unit 6 through an internal wiring N, and the power supply terminal block 16 is connected to the linkage breaker 15 through an external wiring M.
The internal wiring N includes a U-phase extension Nu, a V-phase extension Nv, and a neutral extension No. The external wiring M includes a U-phase external line Mu, a V-phase external line Mv, and a neutral external line Mo. Is provided.

The distribution board 8 includes a first current detection unit D1 and a second current detection unit D2 that individually detect currents flowing in the U-phase line U and the V-phase line V of the commercial power supply 7, and the U-phase line U and the V-phase. It is installed corresponding to the line V.
Incidentally, in the present embodiment, the first current detection unit D1 and the second current detection unit D2 are installed between the main breaker 13 and the branch breaker 14, but for example, the first current detection unit D1 and the first current detection unit D1 The installation location of the 1st current detection part D1 and the 2nd current detection part D2 can be changed, such as installing 2 current detection part D2 in the commercial power supply 7 side rather than the limiter 12. FIG.

The operation control unit 6 is connected to a U-phase signal line Su and a V-phase signal line Sv.
The first current detection unit D1 is connected to the U-phase signal line Su, and the second current detection unit D2 is connected to the V-phase signal line Sv.
Therefore, the first current detection unit D1 is installed so as to detect the current flowing through the U-phase line U, and the second current detection unit D2 is installed so as to detect the current flowing through the V-phase line V.
The first current detection unit D1 and the second current detection unit D2 are collectively referred to as a pair of current detection units D.

  The pair of current detection units D is configured using a current transformer type AC current sensor. In the present embodiment, when the installation direction is appropriate, the commercial power source 7 supplies the electric load 10. A positive voltage signal is output when a current flows in the direction, and a negative voltage signal is output when a current flows in the direction toward the commercial power source 7.

  When the cogeneration system is installed at a place such as a home, the first current detection unit D1 connected to the U-phase signal line Su is installed on the U-phase line U in an appropriate installation direction, and the V-phase The second current detection unit D2 connected to the signal line Sv is installed on the V-phase line V in an appropriate installation direction. In the present embodiment, the operation control unit 6 has a pair of current detection units D. It is configured to execute a diagnosis process for diagnosing whether or not the installation state is appropriate, details of which will be described later.

  The combined heat and power system of this embodiment is connected to the commercial power supply 7 so as not to generate a reverse power flow, and the detection information of the first current detection unit D1 and the second current detection unit D2 is a surplus power heater. It is used as information for adjusting the power consumption of the part G, and in addition, it is used for determining the amount of power used by the commercial power supply 7 (power consumption). In addition, the calculated | required electric power consumption will be displayed on the remote control R which instruct | indicates the operation information of the combined heat and power supply part H.

  Incidentally, the amount of power used is the sum of the product of the voltage of the U-phase line U and the current of the U-phase line U, and the product of the product of the voltage of the V-phase line V and the current of the V-phase line V. Therefore, it is necessary for the pair of current detection units D to appropriately detect the current of the U-phase line U and the current of the V-phase line V.

Although not shown, the operation control unit 6 includes a U-phase side voltage detection unit that detects the voltage of the U-phase line U and a V-phase side voltage detection unit that detects the voltage of the V-phase line V.
Then, the arithmetic processing unit (CPU) provided in the operation control unit 6 is based on the detection information of the U-phase side voltage detection unit and the V-phase side voltage detection unit and the detection information of the pair of current detection units D described above. The obtained power usage amount is obtained, and the obtained power usage amount is displayed on the remote controller R.

(Configuration of heat source)
As shown in FIG. 1, in addition to the hot water storage tank 1 and the auxiliary heat source unit 2 described above, the multi-function circulation pump 20, the heating circulation pump 21, the bath recirculation circulation pump 22, and the exhaust heat recovery are included in the heat source Hb. A heat exchanger 23, a heat exchanger 24 for heating, and a heat exchanger 25 for bath remedy are provided.
The heat source Hb is provided with a hot water supply mixing valve 26, a hot water filling valve 27, a heating circuit supply valve 28, a heat storage switching valve 29, a circulation opening / closing valve 30, a three-way valve 31, and a circulation amount adjusting valve 32. Yes.

A tank upper passage 33 is provided at the upper part of the hot water storage tank 1, and a tank lower passage 34 is provided at the bottom of the hot water storage tank 1. The tank upper passage 33 is connected to the hot water supply mixing valve 26, and the tank lower passage 34 is connected to the three-way valve 31.
A water supply path 35 for supplying hot water from a water supply source such as tap water branches into a first water supply path 35 a connected to the hot water supply mixing valve 26 and a second water supply path 35 b connected to the bottom of the hot water storage tank 1. Has been.

The multi-function circulation path 36 in which the multi-function circulation pump 20 is arranged includes the auxiliary heat source unit 2, the circulation amount adjustment valve 32, the circulation on-off valve 30, the heating heat exchanger 24, the bath recuperation heat exchanger 25, and the three-way valve. 31 and the exhaust heat recovery heat exchanger 23.
The exhaust heat recovery heat exchanger 23 is connected to a hot water circulation path 5B that circulates hot water between the power generation unit Ha and the heat source unit Hb. The exhaust heat recovery heat exchanger 23 increases the amount of exhaust heat from the power generation unit Ha. The hot water circulating through the functional circuit 36 is heated.

The heat exchanger 24 for heating and the heat exchanger 25 for bath remedy are arranged in series in the multi-function circulation path 36, and the heating heat exchanger 24 and the heat for bath remedy are heated by opening and closing the circulation opening / closing valve 30. The flow of hot water through the exchanger 25 is configured to be interrupted.
A heat storage path 37 for connecting the downstream side portion of the auxiliary heat source device 2 in the multi-function circulation path 36 and the tank upper path 33 is provided, and a heat storage switching valve 29 is provided in the heat storage path 37.

A heating circulation path 38 for circulating a heating heat medium to a heating terminal T such as a floor heating device is provided via the heating heat exchanger 24, and the heating circulation pump 21 is used for heating. It is provided in the circulation path 38.
The heating circulation path 38 is provided with a short-circuit path 38a and an expansion tank 39 for short-circuiting the heating heat medium. Further, a supply path 40 for supplying hot water from the water supply path 35 to the expansion tank 39 is provided, and a heating circuit supply valve 28 is provided in the supply path 40.

A bath circulation path 42 connected to the bathtub 41 is provided in a state of passing through the bath chasing heat exchanger 25, and a bath chasing circulation pump 22 is provided in the bath circulation path 42.
A hot water supply passage 43 extending from the hot water supply mixing valve 26 is provided in a state of being connected to a general hot water tap (not shown), and connects a midpoint of the hot water supply passage 43 and a midpoint of the bath circulation path 42. A hot water passage 44 is provided, and a hot water valve 27 is provided in the hot water passage 44.

(Overview of heat source operation)
The heat source Hb is a multi-function circulation pump that closes the circulation on-off valve 30, opens the heat storage switching valve 29, and switches the three-way valve 31 to a state in which the tank lower path 34 and the multi-function circulation path 36 are communicated. By operating 20, the hot water storage operation is performed.

That is, the hot water taken out from the tank lower passage 34 is flowed to the multi-function circulation passage 36 via the three-way valve 31 and heated by the exhaust heat recovery heat exchanger 23, and the heated hot water is passed through the heat storage passage 37. Thus, the hot water storage operation is performed while returning to the hot water storage tank 1.
At this time, the temperature of the hot water stored is adjusted to an appropriate temperature (for example, 70 ° C.) by adjusting the hot water flow rate by the circulation amount adjusting valve 32.

  Also, the multi-function circulation pump 20 is operated by opening the circulation on-off valve 30, closing the heat storage switching valve 29, and switching the three-way valve 31 to a state where the tank lower passage 34 and the multi-function circulation passage 36 are not communicated. Thus, while circulating hot water through the multi-function circuit 36, the heating operation for supplying the heat medium to the heating terminal T through the heating circuit 38, and heating the bath water through the bath circuit 42 are circulated. It is configured to perform bath memorial operation.

  Furthermore, the heat source Hb mixes the hot water from the tank upper passage 33 and the hot water from the first water supply passage 35a and supplies the hot water from the hot water supply passage 43, and branches the hot water in the hot water supply passage 43 to the hot water passage 44. Thus, the hot water supply operation for supplying the hot water to the bathtub 41 through the bath circulation path 42 is performed.

  In each of the heating operation and the bath retreat operation, basically, hot water is circulated through the multi-function circulation path 36 by the operation of the multi-function circulation pump 20, and the exhaust heat recovery heat exchanger 23 performs the operation of the power generation unit Ha. This is performed by heating the hot water circulating through the multi-function circulation path 36 by exhaust heat, but when the exhaust heat of the power generation unit Ha is insufficient, the auxiliary heat source unit 2 is operated to circulate through the multi-function circulation path 36. Will be heated.

Each of the general hot water supply operation and the hot water supply hot water operation is basically performed using the hot water in the hot water storage tank 1, but when the amount of hot water stored in the hot water storage tank 1 is insufficient, the auxiliary heat source machine 2 is It is configured to be operated by combustion.
That is, in the state where the multifunction circulation pump 20 is operated, the hot water flowing from the tank lower passage 34 to the multifunction circulation passage 36 via the three-way valve 31 is heated by the auxiliary heat source unit 2, The tank upper passage 33 can be made to flow through the heat storage passage 37.

(Details of auxiliary heat source machine)
As shown in FIG. 1, the auxiliary heat source unit 2 burns into a finned tube heat exchange unit 2A through which hot water flows, a heating burner 2B that heats the finned tube heat exchange unit 2A, and a heating burner 2B. It is comprised so that the ventilation fan 2C which supplies industrial air may be provided.
And the heat source machine control part 2D (refer FIG. 2) which controls the driving | operation of the auxiliary heat source machine 2 is comprised so that the action | operation of the heating burner 2B and the ventilation fan 2C may be controlled.

  That is, the heat source controller 2D detects that the amount of hot water flowing through the finned-tube heat exchange unit 2A is greater than or equal to the set water flow rate by a water flow rate sensor (not shown), and the hot water temperature sensor (Not shown), when it is detected that the temperature of the hot water flowing through the finned-tube heat exchange unit 2A is equal to or lower than a set target temperature (for example, 70 ° C.), the operation of the heating burner 2B and the blower fan 2C And the heating amount of the heating burner 2B is adjusted so that the temperature of the heated hot water becomes a set target temperature (for example, 70 ° C.).

  Incidentally, although illustration is omitted, the terminal side control unit 11 and the heat source unit control unit 2D are communicatively connected via a communication line, and the terminal side control unit 11 performs heating operation with respect to the heat source unit control unit 2D. It is configured to command various information such as command information for commanding permission.

(Prevention of freezing of power generation section)
As shown in FIG. 1, the power generation unit Ha includes a first electric heater 46 that heats the cooling water circulation path 5A and a plurality of second electric heaters 47 that heat the hot water circulation path 5B.
When any of the detected temperatures of a plurality of temperature detection sensors (not shown) for detecting the temperatures of the cooling water circulation path 5A and the hot water circulation path 5B is equal to or lower than the freezing prevention temperature (for example, 5 ° C.), the operation control unit 6 However, the cooling water circulation pump Pa and the hot water circulation pump Pb are operated, and the first electric heater 46 and the second electric heater 47 are operated to raise the temperature of the cooling water circulation path 5A and the hot water circulation path 5B. Has been.

  Thereafter, all of the detected temperatures of a plurality of temperature detection sensors (not shown) for detecting the temperatures of the cooling water circulation path 5A and the hot water circulation path 5B are higher than the set end temperature (for example, 10 ° C.) higher than the freezing prevention temperature. Then, the operation control unit 6 is configured to stop the operation of the cooling water circulation pump Pa and the hot water circulation pump Pb and stop the operation of the first electric heater 46 and the second electric heater 47.

(About prevention of freezing of heat source)
As shown in FIG. 1, the heat source Hb includes a plurality of first heating channels 35, a first water supply channel 35 a, a second water supply channel 35 b, a multi-function circulation channel 36, a replenishment channel 40, and a hot water supply channel 43. Three electric heaters 48 are provided.
In addition, the auxiliary heat source device 2 is provided with a fourth electric heater 49 for heating the pipe line near the finned-tube heat exchange unit 2A.

  And the detected temperature of the several temperature detection sensor (not shown) which detects the temperature of the water supply path 35, the 1st water supply path 35a, the 2nd water supply path 35b, the multifunctional circulation path 36, the replenishment path 40, and the hot water supply path 43. When any of them becomes below the freezing prevention temperature (for example, 5 ° C.), the terminal-side control unit 11 operates the third electric heater 48 to supply the water supply channel 35, the first water supply channel 35a, the second water supply channel 35b, The multifunctional circulation path 36, the replenishment path 40, and the hot water supply path 43 are configured to be heated.

  Thereafter, the detected temperature of a plurality of temperature detection sensors (not shown) for detecting the temperatures of the water supply passage 35, the first water supply passage 35a, the second water supply passage 35b, the multifunction circulation passage 36, the replenishment passage 40, and the hot water supply passage 43. The terminal-side control unit 11 is configured to stop the operation of the third electric heater 48 when everything reaches a set end temperature (for example, 10 ° C.) higher than the freeze prevention temperature (for example, 5 ° C.) or higher. Yes.

  When the detection temperature of a temperature detection sensor (not shown) for detecting the temperature of the fin tube type heat exchanging part 2A in the auxiliary heat source unit 2 or the pipe part in the vicinity thereof becomes a freezing prevention temperature (for example, 5 ° C.) or less, The heat source machine control unit 2D is configured to operate the fourth electric heater 49 to raise the temperature of the fin tube type heat exchange unit 2A and a pipe line portion in the vicinity thereof.

  Thereafter, a detection temperature of a temperature detection sensor (not shown) that detects the temperature of the fin-tube heat exchange section 2A or a pipe section in the vicinity thereof is a set end temperature (e.g., 5 ° C.) higher than the freeze prevention temperature (for example, 5 ° C.). For example, when the temperature becomes 10 ° C. or higher, the heat source controller 2D is configured to stop the operation of the fourth electric heater 49.

(Details of the drive configuration of the power generation unit)
As shown in FIG. 2, the power generation unit Ha includes a first drive circuit unit 51 for driving the cooling water circulation pump Pa, a second drive circuit unit 52 for driving the hot water circulation pump Pb, and a first electric heater 46. A third drive circuit unit 53 for driving the second electric heater 47 and a fourth drive circuit unit 54 for driving the second electric heater 47 are provided.

  Furthermore, the surplus electric power heater part G mentioned above is provided in the electric power generation part Ha. The surplus power heater unit G includes first surplus power heater driving unit 61 to sixth surplus power heater driving unit 66 for driving the first surplus power heater F1 to the sixth surplus power heater F6 as surplus power heaters. Is provided.

  In the present embodiment, the first surplus power heater drive unit 61 to the third surplus power heater drive unit 63, the first drive circuit unit 51, and the third drive circuit unit 53 are connected to the U-phase extension Nu in the internal wiring N and the middle. The fourth surplus power heater drive unit 64 to the sixth surplus power heater drive unit 66, the second drive circuit unit 52, and the fourth drive circuit unit 54 are connected to the sexual extension No. It is connected to the service extension Nv and the neutral extension No.

  And corresponding to each of the 1st drive circuit part 51, the 2nd drive circuit part 52, the 3rd drive circuit part 53, and the 4th drive circuit part 54, the 1st drive switch 51S which interrupts supply of electric power each separately, A second drive switch 52S, a third drive switch 53S, and a fourth drive switch 54S are provided so that the first drive switch 51S to the fourth drive switch 54S are intermittently operated according to a command from the operation control unit 6. It is configured. Corresponding to each of the first surplus power heater driving unit 61 to the sixth surplus power heater driving unit 66, there are first surplus power heater switch 61S to sixth surplus power heater switch 66S for intermittently supplying power. The operation control unit 6 is configured to be intermittently operated according to a command.

  Therefore, the operation control unit 6 intermittently operates the first drive switch 51S to the fourth drive switch 54S to control each of the cooling water circulation pump Pa, the hot water circulation pump Pb, the first electric heater 46, and the second electric heater 47. It is configured so that it can be switched between an operation state and an operation stop state. The operation control unit 6 operates the first surplus power heater F1 to the sixth surplus power heater F6 by operating intermittently the first surplus power heater switch 61S to the sixth surplus power heater switch 66S. It is comprised so that it can switch to a stop state.

  Incidentally, the operation control unit 6 prevents the reverse power flow from the power generation unit Ha to the commercial power source 7 based on the detection information of the pair of current detection units D. The first surplus power heater switch 61S to the sixth surplus power heater switch 66S are configured to be intermittently operated so that the power consumption of the surplus power heater unit G increases as the value increases.

Further, the power generation unit Ha is provided with a pair of first terminal block 55A and second terminal block 55B, and the terminal side control unit of the heat source unit Hb with respect to the first terminal block 55A and the second terminal block 55B. 11 and the heat source machine control part 2D of the auxiliary heat source machine 2 are configured to be freely connectable.
As the first terminal block 55A is connected to the U-phase extension Nu and the neutral extension No in the internal wiring N, the U-phase side connection portion that outputs power from the U-phase line U to the outside is provided. Further, the second terminal block 55B is connected to the V-phase extension Nv and the neutral extension No in the internal wiring N, so that the power from the V-phase line V is output to the outside. It is configured as a connection part.

A U-phase side switch 56A serving as a U-phase side interrupting portion for interrupting the connection between the first terminal block 55A and the internal wiring N, and a V-phase side interrupting portion for interrupting the connection between the second terminal block 55B and the internal wiring N. The V-phase side switch 56B is provided, and the U-phase side switch 56A and the V-phase side switch 56B are configured to be intermittently operated by the operation control unit 6.
That is, the first terminal block 55A as the U-phase side connection portion is configured to be switchable between the output action state and the output stop state by the U-phase side switch 56A, and similarly, the second terminal block 55A as the V-phase side connection portion. The terminal block 55B is configured to be switchable between an output action state and an output stop state by a V-phase side switch 56B.

The terminal side control unit 11 and the heat source unit control unit 2D are configured to be freely connectable to both the first terminal block 55A and the second terminal block 55B, but the basic connection state is as shown in FIG. The side control unit 11 is connected to the first terminal block 55A, and the heat source unit control unit 2D is connected to the second terminal block 55B.
Incidentally, the terminal side controller 11 and the heat source machine controller 2D are connected to the first terminal block 55A and the second terminal block 55B via the first relay line 57A and the second relay line 57B.

  Further, in the present embodiment, the operation control unit 6 and the heat source machine control unit 2D are connected by the communication line 58, and when performing diagnosis processing in the second embodiment to be described later, the operation control unit 6 Command information for operating the blower fan 2C and the fourth electric heater 49 is instructed to the heat source controller 2D.

(Details of heat source)
As shown in FIG. 2, the heat source Hb includes a multi-function circulation pump 20, a heating circulation pump 21, a bath tracking circulation pump 22, and a third electric heater 48 as a main body side electric device E <b> 1. The auxiliary heat source device 2 including B1, the blower fan 2C, and the fourth electric heater 49 as the auxiliary electric device E2 is configured as the auxiliary processing unit B2.
In addition, the main body side electric device E1 and the auxiliary side electric device E2 are collectively referred to as an electric device Eb included in the heat source unit Hb.

Further, the terminal-side control unit that communicates with the operation control unit 6 via the communication line L in the power supply state where the main body processing unit B1 is connected to either the first terminal block 55A or the second terminal block 55B. 11 is provided.
Further, the auxiliary processing unit B2 communicates with the operation control unit 6 via the communication line 58 in a power supply state by connection with either the first terminal block 55A or the second terminal block 55B. It is comprised in the form provided with 2D.

That is, the main body processing unit B1 of the heat source unit Hb is connected to one of the first terminal block 55A and the second terminal block 55B and includes the main body side electric device E1 as an electric load. The terminal-side control unit 11 that communicates with the unit 6 is provided.
In addition, the auxiliary processing unit B2 of the heat source unit Hb is connected to the other of the first terminal block 55A and the second terminal block 55B and includes an auxiliary-side electric device E2 as an electric load. It is comprised so that the heat source machine control part 2D communicated between the parts 6 may be provided.

  Incidentally, the terminal-side control unit 11 is connected to either the first terminal block 55A or the second terminal block 55B via the first relay line 57A, and the heat source unit control unit 2D is connected to the second relay line 57B. It will be connected to either the first terminal block 55A or the second terminal block 55B.

(Control operation of operation control unit)
The operation control unit 6 selectively selects the U-phase side electric load Eu connected to the U-phase line U and the V-phase side electric load Ev connected to the V-phase line V while the power generation of the fuel cell 4 is stopped. The diagnostic processing for diagnosing the installation state of the pair of current detection units D is performed.

  In this diagnosis process, a change in current value generated by applying a load to each of the U-phase side electrical load Eu and the V-phase side electrical load Ev cannot be detected from any current value of the pair of current detection units D. In such a case, the load is changed to the load increasing side, and the current value generated by applying the load is increased stepwise from the set small load to the set large load, and a pair of current detections are performed. When it can detect from any current value of the part D, it is comprised so that the process which determines the installation state of a pair of current detection part D based on the detection result may be performed.

In the present embodiment, the operation control unit 6 is configured to use the surplus power heater unit G as the U-phase side electric load Eu and the V-phase side electric load Ev.
That is, the operation control unit 6 connects the first surplus power heater driving unit 61 to the third surplus power heater driving unit 63 that drives the first surplus power heater F1 to the third surplus power heater F3 to the U-phase line U. The fourth surplus power heater driving unit 64 to the sixth surplus power heater driving unit 66 for driving the fourth surplus power heater F4 to the sixth surplus power heater F6 are connected to the V-phase line V. The diagnosis processing is executed in a form used as the V-phase side electric load Ev.

The U-phase side electric load Eu is a load of three stages having different sizes, that is, a first U-phase side electric load Eu1 that is a small load, a second U-phase side electric load Eu2 that is an intermediate load, and a large load. It is comprised so that it can change to the 3rd U-phase side electric load Eu3. The first U-phase side electric load Eu1 is configured by the first surplus power heater driving unit 61, and the second U-phase side electric load Eu2 is configured by the first surplus power heater driving unit 61 and the second surplus power heater driving unit 62. The third U-phase side electric load Eu3 includes a first surplus power heater driving unit 61, a second surplus power heater driving unit 62, and a third surplus power heater driving unit 63.
Incidentally, the first U-phase side electric load Eu1 corresponds to a set small load of the U-phase side electric load Eu, and the third U-phase side electric load Eu3 corresponds to a set large load of the U-phase side electric load Eu.

Similarly, the V-phase side electric load Ev is a three-stage load having different sizes, that is, a first V-phase side electric load Ev1 that is a small load, a second V-phase side electric load Ev2 that is an intermediate load, and a large load. It can be changed to a certain third V-phase side electric load Ev3. The first V-phase side electric load Ev1 is configured by the fourth surplus power heater driving unit 64, and the second V-phase side electric load Ev2 is configured by the fourth surplus power heater driving unit 64 and the fifth surplus power heater driving unit 65. The third V-phase side electric load Ev3 includes a fourth surplus power heater driving unit 64, a fifth surplus power heater driving unit 65, and a sixth surplus power heater driving unit 66.
Incidentally, the first V-phase side electric load Ev1 corresponds to a set small load of the V-phase side electric load Ev, and the third V-phase side electric load Ev3 corresponds to a set large load of the V-phase side electric load Ev.

  In addition, detection of a change in the current value generated by applying any one of the first U-phase side electrical load Eu1, the second U-phase side electrical load Eu2, and the third U-phase side electrical load Eu3 is performed by detecting the current before the load is applied. It is detected whether or not the absolute value of the current value after the load is applied has changed more than the set value with respect to the absolute value of the value.

  This set value is provided corresponding to the magnitudes of the first U-phase side electrical load Eu1, the second U-phase side electrical load Eu2, and the third U-phase side electrical load Eu3. For example, a current value of about 90% of the current value calculated from the power consumption of each of the first U-phase side electrical load Eu1, the second U-phase side electrical load Eu2, and the third U-phase side electrical load Eu3 is set as the set value. The

In the present embodiment, the first U-phase side electrical load Eu1, the second U-phase side electrical load Eu2, and the third U-phase side are based on the integrated current value obtained by integrating the current values detected by the pair of current detection units D. It is configured to detect a change in current value that occurs when the electric load Eu3 is applied.
In other words, the current value before the first U-phase side electrical load Eu1, the second U-phase side electrical load Eu2 and the third U-phase side electrical load Eu3 are applied, and the current value after these loads are applied are instantaneous values. However, in the present embodiment, the first U-phase side electric load Eu1 and the second U-phase side electric load are excluded while eliminating the influence of disturbance by using the integrated value of the set time (for example, 1 second). It is possible to appropriately detect a change in the current value caused by applying the load Eu2 and the third U-phase side electric load Eu3.

  In addition, the detection of the change in the current value generated by applying any one of the first V-phase side electric load Ev1, the second V-phase side electric load Ev2, and the third V-phase side electric load Ev3 is performed as described above. This is configured to be performed in the same manner as the detection of the change in the current value generated by applying any one of the electrical load Eu1, the second U-phase side electrical load Eu2, and the third U-phase side electrical load Eu3.

  Then, when the cogeneration unit H is installed, the operation control unit 6 is configured to execute a diagnostic process by giving an instruction with the remote controller R.

(Details of diagnostic processing)
Next, diagnostic processing executed by the operation control unit 6 will be described based on the flowcharts of FIGS. 3 and 4.
First, the first U-phase side electric load Eu1 is turned on by turning on and operating the first surplus power heater switch 61S (# 20). Then, it is determined whether or not a change in the current value due to turning on the first U-phase side electric load Eu1 is detected in any of the pair of current detection units D (# 21).

  If no change in the current value is detected in # 21, the second U-phase side electric load Eu2 is turned on by turning on and operating the first surplus power heater switch 61S and the second surplus power heater switch 62S (# 22). ). Then, it is determined whether or not a change in the current value due to turning on the second U-phase side electric load Eu2 is detected in any of the pair of current detection units D (# 23).

  If no change in current value is detected in # 23, the third U-phase side electric load Eu3 is turned on by turning on and operating the first surplus power heater switch 61S to the third surplus power heater switch 63S (# 24). ). Then, in any one of the pair of current detection units D, it is determined whether or not a change in the current value due to turning on the third U-phase side electric load Eu3 is detected (# 25).

  If a change in current value is not detected in # 25, it is determined repeatedly whether or not a change in current value due to turning on the third U-phase side electric load Eu3 is detected (# 26). ). If no change in the current value is detected in any of the determinations repeated up to three times, it is determined that the pair of current detection parts D are not in an abnormal state and the abnormality is detected by the remote controller R. An alarm process such as displaying the status is executed (# 27). That is, when the change in the current value generated by applying the U-phase side electric load Eu to the set large load is not detected by one of the pair of current detection units D, it is an abnormal state. It is comprised so that it may determine.

  If any change in the current value is detected in any of # 21, # 23, and # 25, it is determined whether or not the change in the current value is detected by the first current detector D1 (# 28). ) When the change in the current value is detected by the first current detector D1, the first current detector D1 is set to the U-phase side (# 29). Subsequently, it is determined whether or not the current value is a positive value (# 31). If the current value is not a positive value (a negative value), the current value is set to be inverted (# 32). .

In # 28, if the change in current value is not detected by the first current detector D1, the change in current value is detected by the second current detector D2. The current detection unit D2 is set to the U phase side (# 30).
Subsequently, it is determined whether or not the current value is a positive value (# 31). If the current value is not a positive value (a negative value), the current value is set to be inverted (# 32). .

  Subsequently, the installation state of the pair of current detection units D is determined by turning on the first V-phase side electric load Ev1 to the third V-phase side electric load Ev3. The first V-phase side electric load Ev1 The procedure for determining the installation state of the pair of current detection units D by turning on the third V-phase side electrical load Ev3 is by turning on the first U-phase side electrical load Eu1 to the third U-phase side electrical load Eu3. This is the same as the procedure for determining the installation state of the pair of current detection units D.

  That is, first, the first V-phase side electric load Ev1 is turned on by turning on and operating the fourth surplus power heater switch 64S (# 33). Then, it is determined whether or not a change in the current value caused by applying the first V-phase side electric load Ev1 is detected in any of the pair of current detection units D (# 34).

  If no change in the current value is detected in # 34, the second V-phase side electric load Ev2 is turned on by turning on and operating the fourth surplus power heater switch 64S and the fifth surplus power heater switch 65S (# 35). ). Then, it is determined whether or not a change in the current value caused by applying the second V-phase side electric load Ev2 is detected in any of the pair of current detection units D (# 36).

  If no change in the current value is detected in # 36, the third V-phase side electric load Ev3 is turned on by turning on and operating the fourth surplus power heater switch 64S to the sixth surplus power heater switch 66S (# 37). ). Then, it is determined whether or not a change in the current value caused by applying the third V-phase side electric load Ev3 is detected in any of the pair of current detection units D (# 38).

  If a change in current value is not detected in # 38, it is repeatedly determined up to three times whether or not a change in current value due to turning on the third V-phase side electric load Ev3 is detected (# 39). ). If no change in the current value is detected in any of the determinations repeated up to three times, it is determined that the pair of current detection parts D are not in an abnormal state and the abnormality is detected by the remote controller R. An alarm process such as displaying the status is performed (# 40). That is, a change in the current value generated by applying the V-phase side electric load Ev in a state where the V-phase side electric load Ev is increased to the set large load is not detected by any one of the pair of current detection units D. In the case, it is configured to determine that the state is abnormal.

  If any change in current value is detected in any of # 34, # 36, and # 38, it is determined whether or not the change in the current value is detected by the first current detector D1 (# 41). ) When the change in the current value is detected by the first current detector D1, the first current detector D1 is set to the V-phase side (# 42). Subsequently, it is determined whether or not the current value is a positive value (# 44). If the current value is not a positive value (a negative value), the current value is set to be inverted (# 45). .

In # 41, if the change in the current value is not detected by the first current detector D1, the change in the current value is detected by the second current detector D2, so that the second The current detection unit D2 is set to the V phase side (# 43).
Subsequently, it is determined whether or not the current value is a positive value (# 44). If the current value is not a positive value (a negative value), the current value is set to be inverted (# 45). .

(Summary of the first embodiment)
In the first embodiment, in the diagnostic process, a change in current value generated by causing the U-phase side electrical load Eu and the V-phase side electrical load Ev to act as a set small load, that is, the first U-phase side electrical load Eu1 and When a change in the current value generated by applying the first V-phase side electric load Ev1 can be detected from any current value of the pair of current detection units D, the pair of current detection units is based on the detection result. The installation state of D can be determined.

Further, when a change in the current value generated by causing the U-phase side electric load Eu and the V-phase side electric load Ev to act as a set small load cannot be detected from the current value of one of the pair of current detection units D The U-phase side electric load Eu and the V-phase side electric load Ev are changed from the set small load to the set large load in a stepwise manner, and the increased U-phase side electric load Eu and Change in current value when the V-phase side electric load Ev is applied, that is, change in current value when the second U-phase side electric load Eu2 and the second V-phase side electric load Ev2 are applied, or the third U-phase side A change in the current value when the electric load Eu3 and the third V-phase side electric load Ev3 are applied is detected from the current value of one of the pair of current detection units D, and a pair of current detection is performed based on the detection result Determine the installation status of part D Can.
Thereby, the diagnosis process which diagnoses the installation state of a pair of electric current detection part D can be performed, aiming at reduction of power consumption.

[Second Embodiment]
Next, the second embodiment will be described. In the second embodiment, the operation control unit 6 uses the electric device Eb included in the heat source unit Hb as the U-phase side electric load Eu and the V-phase side electric load Ev. Since the configuration is different from that of the first embodiment in that it is configured to perform diagnostic processing in the form, and other configurations are the same as those of the first embodiment, only the portions that are different from the first embodiment will be described. Detailed description of the same configuration as that of the first embodiment will be omitted.

  In the second embodiment, the operation control unit 6 has the main body of the heat source unit Hb as the U-phase side electric load Eu connected to the U-phase line U and the V-phase side electric load Ev connected to the V-phase line V. The diagnosis processing is executed in a form using the main body side electric device E1 of the processing unit B1 and the auxiliary side electric device E2 of the auxiliary processing unit B2.

  Therefore, in the second embodiment, the operation control unit 6 switches one of the first terminal block 55A and the second terminal block 55B to the output action state before the diagnosis process, The main body processing unit B1 is connected to the first terminal block 55A, and the main body processing unit B1 is connected to the first terminal block 55A. In the case of connection, the main body side electrical device E1 is set to the U-phase side electric load Eu and the auxiliary processing unit B2 is set to the V-phase side electric load Ev, and the main body processing unit B1 is connected to the second terminal block 55B. In such a case, a load setting process is performed in which the main body-side electric device E1 is set to the V-phase side electric load Ev and the auxiliary-side electric device E2 is set to the U-phase side electric load Eu.

  That is, when the combined heat and power supply unit H is installed, the operation control unit 6 executes a test process for sequentially performing a connection confirmation process, a load setting process, and a diagnosis process by instructing a test command with the remote controller R. It is configured as follows.

(Details of the test process)
Next, the test process executed by the operation control unit 6 will be described based on the flowchart of FIG.
First, a switch operation process for turning ON the U-phase side switch 56A and turning OFF the V-phase side switch 56B is performed (# 51), and then test communication is executed with the terminal-side control unit 11 ( Then, it is determined whether or not the test communication with the terminal-side control unit 11 is appropriate (# 53).

  Incidentally, the purpose of the test communication is to confirm whether or not the terminal-side control unit 11 is supplied with power from the first terminal block 55A by connecting the terminal-side control unit 11 to the first terminal block 55A. Therefore, for example, the operation control unit 6 communicates response request information to the terminal-side control unit 11, and the terminal-side control unit 11 that has received the response request information transmits to the operation control unit 6. The operation control unit 6 recognizes that the communication is appropriate when the response information is received from the terminal-side control unit 11.

  If it is determined in # 53 that the test communication is proper, the main body side electric device E1 is set to the U-phase side electric load Eu, and the auxiliary side electric device E2 is set to the V-phase side electric load Ev. (# 54), and then the process proceeds to a diagnosis process (# 59).

  If it is determined at # 53 that the test communication is not appropriate, a switch operation process is performed to turn off the U-phase side switch 56A and turn on the V-phase side switch 56B (# 55). Test communication is performed with the terminal-side control unit 11 (# 56), and then it is determined whether the test communication with the terminal-side control unit 11 is appropriate (# 57).

If it is determined in # 57 that the test communication is appropriate, the main body side electric device E1 is set to the V-phase side electric load Ev and the auxiliary side electric device E2 is set to the U-phase side electric load Eu. Then (# 58), the process proceeds to a diagnosis process (# 59).
If it is determined in # 57 that the test communication is not proper, the remote control R is used because the main body processing unit B1 and the auxiliary processing unit B2 of the heat source unit Hb are not connected to the power generation unit Ha. Alarm processing such as displaying an abnormal state is executed (# 60).

  Incidentally, the processes of # 51 to # 53 and the processes of # 55 to # 57 described above correspond to the connection confirmation process, and the processes of # 54 and # 58 correspond to the load setting process.

  In the load setting process, for example, when the main body side electric device E1 is set to the U phase side electric load Eu and the auxiliary side electric device E2 is set to the V phase side electric load Ev, the U phase side electric load is set. As the load Eu, for example, the multi-function circulation pump 20, the heating circulation pump 21 and the bath recirculation pump 22 can be used. As the V-phase side electric load Ev, for example, the blower fan 2C can be used. it can.

  In this case, for the U-phase side electric load Eu, the multi-function circulation pump 20 is set as the first U-phase side electric load Eu1, and the two pumps of the multi-function circulation pump 20 and the heating circulation pump 21 are set as the second U-phase side electric load Eu2. Then, the diagnosis processing shown in FIGS. 3 and 4 is performed with the three pumps of the multi-function circulation pump 20, the heating circulation pump 21, and the bath recirculation pump 22 as the third U-phase side electric load Eu3.

  Further, the V-phase side electric load Ev is increased stepwise from the first V-phase side electric load Ev1 to the third V-phase side electric load Ev3 by changing the rotation speed of the blower fan 2C. Specifically, the state in which the blower fan 2C has a rotational speed of 40% of the rated rotational speed is the first V-phase side electric load Ev1, and the state in which the blower fan 2C has a rotational speed of 70% of the rated rotational speed is the second V The diagnosis process shown in FIGS. 3 and 4 is performed with the phase-side electric load Ev2 and the state where the blower fan 2C is set to the rated rotational speed as the third V-phase side electric load Ev3.

(Summary of the second embodiment)
In the second embodiment, as in the first embodiment, a diagnosis process for diagnosing the installation state of the pair of current detection units D can be performed while reducing power consumption.
Further, in the second embodiment, one of the main body side electric device E1 and the auxiliary side electric device E2 is used as the U phase side electric load Eu as the electric device Eb equipped in the heat source unit Hb, and While the other of the main body side electric device E1 and the auxiliary side electric device E2 is used as the V-phase side electric load Ev, the diagnosis process is performed, so that the electric device Eb equipped in the heat source part Hb is used. Diagnosis processing can be performed.
Therefore, for example, even when the surplus power heater unit G provided in the power generation unit Ha is omitted, the diagnosis process can be performed. That is, when the power generation unit Ha is connected to the commercial power supply 7 so as to allow reverse power flow, the surplus power heater unit G is omitted. In such a case, the diagnosis process can be performed.

[Third Embodiment]
Next, although 3rd Embodiment is described, this 3rd Embodiment uses the main body side electric equipment E1 with which the operation control part 6 is equipped with the main body process part B1 of the heat source part Hb as the U-phase side electric load Eu. The V-phase side electric load Ev is different from the first embodiment in that the diagnosis process is performed in a form using an electric device provided in the power generation unit Ha, and other configurations are the first embodiment. Since it is the same as the embodiment, only the parts different from the first embodiment will be described, and the detailed description of the same configuration as the first embodiment will be omitted.

  In the third embodiment, among the electric devices included in the power generation unit Ha, the second drive circuit unit 52 drives the hot water circulation pump Pb that is a large electric load, and the fourth drive circuit unit 54 has a large electric load. In view of driving a plurality of second electric heaters 47 serving as loads, the second drive circuit unit 52 and the second drive circuit unit 52 connected to the V-phase extension Nv and the neutral extension No of the power generation unit Ha and the second The four drive circuit unit 54 is configured to be used as the V-phase side electric load Ev.

  That is, first, the operation control unit 6 switches one of the first terminal block 55A and the second terminal block 55B to the output operation state and communicates with the terminal-side control unit 11 before the diagnosis process. Then, a connection confirmation process is performed to determine whether the main body processing unit B1 is connected to the first terminal block 55A or the second terminal block 55B.

  In the unlikely event that the operation control unit 6 is connected to the second terminal block 55B, a notification that prompts the operation control unit 6 to replace the operation control unit 6 with the first terminal block 55A is notified by the remote control R. Execute the process.

  Next, in a state where the main body processing unit B1 is connected to the first terminal block 55A, the operation control unit 6 sets the main body side electric device E1 to the U-phase side electric load Eu and the V phase of the power generation unit Ha. Load setting processing for setting the second drive circuit unit 52 and the fourth drive circuit unit 54 connected to the service extension Nv and the neutral extension No to the V-phase side electrical load Ev is performed.

  Thereafter, as in the first embodiment, a diagnostic process for diagnosing the installation state of the pair of current detection units D is performed while selectively acting on the U-phase side electrical load Eu and the V-phase side electrical load Ev.

  In the diagnosis processing of the present embodiment, for example, the multi-function circulation pump 20, the heating circulation pump 21, and the bath-measuring circulation pump 22 can be used as the U-phase side electric load Eu. Is the first U-phase side electric load Eu1, and the two pumps of the multi-function circulation pump 20 and the heating circulation pump 21 are the second U-phase side electric load Eu2, and the multi-function circulation pump 20, the heating circulation pump 21 and the bath memory The three pumps of the circulating pump 22 are used as the third U-phase side electric load Eu3, and the diagnosis process shown in FIGS. 3 and 4 is performed.

  Further, as the V-phase side electric load Ev, for example, the hot water circulation pump Pb connected to the second drive circuit unit 52 is set as the first V-phase side electric load Ev1, and the fourth drive circuit unit 54 is added to the hot water circulation pump Pb. A state in which the connected second electric heater 47 is 50% of the rated output is a second V-phase side electric load Ev2, and in addition to the hot water circulation pump Pb, the second electric heater connected to the fourth drive circuit unit 54 The diagnosis process shown in FIGS. 3 and 4 is performed with the state where 47 is the rated output as the third V-phase side electric load Ev3.

  As described above, when the cogeneration unit H is installed, the operation control unit 6 sequentially performs connection confirmation processing, notification processing, load setting processing, and diagnosis processing by instructing a test command with the remote controller R. It is configured to perform a test process.

(Summary of the third embodiment)
In the third embodiment, similarly to the first embodiment, it is possible to perform a diagnosis process for diagnosing the installation state of the pair of current detection units D while reducing power consumption.
Moreover, in 3rd Embodiment, the 2nd drive circuit part which uses the main body side electric equipment E1 as the electric equipment Eb with which the heat-source part Hb is equipped as the U-phase side electric load Eu, and is equipped with the electric power generation part Ha. The diagnostic process can be performed satisfactorily while using the 52 and the fourth drive circuit unit 54 as the V-phase side electric load Ev.
Therefore, for example, even when the surplus power heater unit G provided in the power generation unit Ha is omitted, the diagnosis process can be performed. That is, when the power generation unit Ha is connected to the commercial power supply 7 so as to allow a reverse power flow, the surplus power heater unit G is omitted. In such a case, the diagnosis process can be performed.

[Another embodiment]
Next, other embodiments are listed.
(1) In the first to third embodiments, in the diagnosis process, the U-phase side electrical load Eu and the V-phase side electrical load Ev are gradually changed from the set small load to the set large load in three stages. Although it is configured to increase, the configuration is not limited to this, and the U-phase side electric load Eu and the V-phase side electric load Ev are increased stepwise from the set small load to the set large load in two steps. May be. Further, the U-phase side electric load Eu and the V-phase side electric load Ev may be configured to increase stepwise in four or more steps from the set small load to the set large load.

(2) In the first embodiment, the surplus power heater unit G is used as the U-phase side electrical load Eu and the V-phase side electrical load Ev. However, the present invention is not limited to this, and the U-phase side electrical load Eu and the V-phase are used. As the side electric load Ev, a plurality of electric devices other than the surplus power heater unit G provided in the power generation unit Ha may be used.

(3) In the first to third embodiments, the thermoelectric control unit C that controls the operation of the combined heat and power supply unit H controls the operation of the operation control unit 6 that controls the operation of the power generation unit Ha and the operation of the heat source unit Hb. Although the case where it comprised from the terminal side control part 11 was illustrated, the operation control part 6 and the terminal side control part 11 are put together as one control part, and the thermoelectric control part C is comprised as one control part. You may implement.

(4) In the first to third embodiments, the power generation unit Ha and the heat source unit Hb are illustrated as separate units. However, the power generation unit Ha and the heat source unit Hb are configured as one unit. You may implement with the form to do.

(5) In the first to third embodiments, the case where the power generation unit Ha includes the fuel cell 4 is exemplified. However, the power generation unit Ha is driven by an engine that operates on fuel gas and the engine. The present invention can also be applied to a case where a generator is provided.

(6) In the first to third embodiments, as the diagnostic process, while the U-phase side electrical load Eu and the V-phase side electrical load Ev are selectively applied, the installation state of the pair of current detection units D, That is, the diagnosis of whether each of the pair of current detection units D is installed in the U-phase signal line Su or the V-phase signal line Sv, and the diagnosis of the installation direction of each of the pair of current detection units D Although the case where it performs is illustrated, for example, before making the U-phase side electric load Eu and the V-phase side electric load Ev act, a pair of current detection is performed based on the flow direction of the current detected by the pair of current detection units D Each of the pair of current detection units D performs a U-phase signal line while selectively activating the U-phase side electrical load Eu and the V-phase side electrical load Ev. Diagnose which of Su and V phase signal line Sv is installed Etc. To way, specific configuration of the diagnostic process can various modifications.

  The configuration disclosed in the above embodiment (including another embodiment, the same shall apply hereinafter) can be applied in combination with the configuration disclosed in the other embodiment, as long as no contradiction occurs. The embodiment disclosed in this specification is an exemplification, and the embodiment of the present invention is not limited to this. The embodiment can be appropriately modified without departing from the object of the present invention.

  As described above, it is possible to provide a combined heat and power system that can perform a diagnosis process for diagnosing the installation state of a pair of current detection units while reducing power consumption.

6 Operation control unit 7 Commercial power supply D Current detection unit Eu U-phase side electric load Ev V-phase side electric load Ha Power generation unit U U-phase line V V-phase line

Claims (3)

A power generation unit interconnected with a single-phase three-wire commercial power source, a pair of current detection units respectively installed on the U-phase line and the V-phase line of the commercial power source, and an operation control for controlling the operation Are provided,
The operation control unit selects a U-phase side electric load supplied with power from the U-phase line and a V-phase side electric load supplied with power from the V-phase line in a state where the operation of the power generation unit is stopped. And a combined heat and power system configured to execute a diagnostic process for diagnosing the installation state of the pair of current detection units,
The operation control unit, as the diagnosis process,
For each of the U-phase side electrical load and the V-phase side electrical load, when a change in current value generated by applying a load cannot be detected from the current value of one of the pair of current detection units, In the form of changing the load from the small load to the large set load, and the change in the current value generated by applying the load is one of the pair of current detection units. When the current value can be detected, the combined heat and power system configured to execute a process of determining the installation state of the pair of current detection units based on the detection result.   The operation control unit selects the U-phase side electrical load and the V-phase side electrical load based on an integrated current value obtained by integrating the current values detected by each of the pair of current detection units in the diagnosis process. The combined heat and power system according to claim 1, wherein the system is configured to detect a change in a current value generated when the electric power is applied.   Changes in the current value generated when the operation control unit causes the U-phase side electrical load and the V-phase side electrical load to act on the set large load in the diagnosis process. The combined heat and power system according to claim 1 or 2, wherein when the current is not detected by any one of the pair of current detection units, it is determined that the state is abnormal.

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