JP2003239806A - Cogeneration system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems in a cogeneration system wherein a whole of the system becomes large when composing it just by combining existing generator units or the like, it is favorable but bothersome for a user to grasp optimum operating conditions by constantly collecting and analyzing data, and it is difficult for the user to easily and quantitatively grasp a reduced amount (a cost advantage) of an energy cost by implementation of the system. <P>SOLUTION: The cogeneration system is composed so that pieces of data regarding a commercial power source and a generated current value of a generator system 1 and data regarding hot water energy are detected and sent to a control system 2, data such as commercial electric energy, generated energy, load electric energy of adding together the commercial electric energy and generated energy, an amount of hot water energy recovered, and energy efficiency is calculated by the control system 2, and the calculated data is displayed in a display means 28 arranged in an interior or on a surface of the generator system 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables a commercial power system and a power generation system by a generator for distributed power sources to be system-interconnected by an inverter, and heat energy generated from a power source of the generator is generated by the power source. The present invention relates to a technology of a control system in a cogeneration system having a mechanism for recovering hot water energy from cooling water and the like.

[0002]

2. Description of the Related Art In recent years, a commercial power system of an external commercial power source and a power generation system of a generator have been connected to a power transmission system for power consuming devices (loads) to cover the power demand of the power consuming devices and to generate power. Along with this, a cogeneration system or the like has been widely used in which exhaust heat generated in a generator is recovered and hot water is supplied using the recovered heat. The generated electric power is controlled by an inverter provided inside the grid interconnection system so as to become the demand electric power together with the commercial electric power. Such a control system is called a system interconnection system because it interconnects the power generation system and the commercial power system.

In such a system interconnection system, a cogeneration system in which heat and electric power are simultaneously generated from one prime mover (power source) efficiently supplies fuel (gas, light oil, etc.) for operating the prime mover. It is intended for economical use. In such a system, it is desirable that heat and electric power are always efficiently output and consumed regardless of the demand situation of both.

[0004]

Particularly when constructing a small-capacity cogeneration system, the existing generator unit, the heat energy recovery unit such as the heat exchanger and the circulation pump, and the control mechanism for controlling them are simply used. If only the combination is used, the size of the entire system will increase. In addition, since the generator unit and the grid interconnection inverter are separate units, it is necessary to newly construct a power management system that manages the power value and power amount of commercial power and generated power. Considering the economic efficiency (energy efficiency) of the cogeneration system, the ratio of the generated power to the demand power (load power) is as large as possible, and the demand for hot water energy is greater than the hot water energy generated by the cogeneration system. desirable. However, since the cogeneration system has the property that the energy efficiency changes depending on the user's energy usage, the user always manages the operation status of the cogeneration system and collects and analyzes data for calculating the energy efficiency. Therefore, it is necessary to understand the optimum operating conditions. Since such data collection and analysis work is complicated, it is difficult for the user to easily and quantitatively grasp the reduction amount (cost merit) of the energy cost by introducing the cogeneration system. In view of such a situation, the present invention provides a cogeneration system that has a compact external dimension suitable for a small capacity and that can easily grasp the operating situation and the amount of energy cost reduction.

[0005]

The problem to be solved by the present invention is as described above, and the means for solving this problem will be described below.

That is, according to the first aspect of the present invention, the data on the commercial power source detected by the inverter of the generator and the generated current value of the generator, and the hot water detected by the sensors arranged in the hot water energy recovery mechanism. Energy-related data is transmitted to the control system, and the control system calculates data such as commercial power amount, generated power amount, load power amount that combines commercial power amount and generated power amount, hot water energy, energy efficiency, etc. The calculation data is displayed on the display means arranged inside or on the surface of the machine body.

In the second aspect, data such as the flow rate and weight of the fuel (gas, liquid) for operating the power source (motor) of the generator is transmitted to the control system, and the control system determines the fuel consumption amount. The calculation data is calculated and displayed on the display means arranged inside or on the surface of the generator body.

According to a third aspect of the present invention, the display means, the storage medium or the output device located at a position distant from the generator main body is
The calculation data is transmitted, displayed or recorded by wireless or wire.

According to a fourth aspect of the present invention, the operating condition of the generator can be set or changed by the display means located away from the main body of the generator.

According to a fifth aspect of the present invention, there is provided a mechanism for detecting an abnormality in the generator device from the calculated data and notifying the maintenance / administrator of the generator.

According to a sixth aspect of the present invention, on the generator system system conceptual diagram in which the calculated data is displayed as a list or schematically on the display means located on the surface of the generator body or at a position distant from the generator body. It is configured to be displayed in.

According to a seventh aspect of the present invention, the control system for the generator automatically adjusts the operating conditions of the generator based on the calculated amount of electric power and data on hot water energy so as to minimize energy efficiency or total electric power cost. A control mechanism was provided.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 is a circuit diagram of a generator system 1, FIG. 2 is a diagram showing an example of a comparison table of commercial / power generation / load power amount, hot water energy recovery amount, virtual load power amount, and fuel consumption amount by time period, FIG. 3 is a diagram showing an example of a comparison table of commercial / power generation / load power amount, hot water energy recovery amount, virtual load power amount and fuel consumption amount by month, and FIG. 4 is commercial / power generation amount and hot water energy by time period. Figure showing an example of a graph of the amount of recovery, Figure 5 shows the amount of commercial and generated electricity by month,
The figure showing the example of the graph of the amount of warm water energy recovery, FIG.
Is a diagram showing an example of a system conceptual diagram displaying each current amount of electricity, and FIG. 7 is a diagram showing an example of a system conceptual diagram showing each amount of electricity and energy for a month.

A generator system 1 as an embodiment of the present invention will be described below. The application of the present invention is
Any generator system can be used as long as the generator output is converted into electric power by a converter and an inverter, and the generator system is not limited to the generator system 1 of the present embodiment.

An embodiment of the present invention will be described below with reference to FIG. The generator system 1 is mainly composed of a prime mover 4 and a generator 3 which is a distributed power source for a commercial power source 40, and converters 21a and 21b for converting power generated by the generator 3 on the output side of the generator 3. , And inverters 6a and 6b are provided. Further, the generator system 1 is provided with a control system 2 for controlling each of these devices. The control system 2 includes a control unit 5 that controls each device, and an operation display 28 that is an input / output unit of the control unit 5. In addition, as the devices controlled by the control unit 5, in addition to the prime mover 4, the generator 3, the inverters 6a and 6b, a radiator fan 7a provided in the radiator 7 and a ventilation fan 1 are provided.
5, a cooling water pump 16 and the like.

The prime mover 4 is an internal combustion engine and is arranged in a machine room (not shown). As fuel for the prime mover 4, light oil,
There is a liquid such as kerosene or heavy oil, or a gas such as natural gas, city gas, sewage digestion gas, etc.
Alternatively, fuel is supplied from the infrastructure to the prime mover 4 through the fuel supply pipe 49. Further, a fuel flow meter 50 is provided in the fuel supply pipe 49, detects data regarding the fuel consumption of the prime mover 4, and transmits the data to the control system 2. By using this data together with the unit price of fuel,
It is possible to calculate the unit price of generated power and hot water energy in each time zone, or the average unit price of a predetermined period. In this embodiment, the method of detecting the flow rate is used as the method of detecting the fuel consumption, but other methods such as the method of detecting the change in the tank weight when replenishing the tank or the like with fuel can be considered. It is not something that will be done. The radiator 7 of the prime mover 4 is arranged in a heat exchange chamber (not shown). Then, the cooling of the indoor air in the machine room and the heat exchange room is performed by taking in the outside air by the ventilation fan 15 and ventilating these rooms.

The prime mover 4 is provided with a starter 10, and electric power is supplied to the starter 10 from a load power system U3.V3 (including a power generation system U2, V2) described later via a transformer 11. ing. In addition, starter 1
0 may be powered by a battery.

The generator 3 is provided with a rotor (not shown) having a field winding excited by a DC power source on a rotary shaft 12 connected to a drive shaft of a prime mover 4, and a stator (not shown). The three-phase output is taken out from the armature. The generator 3 has an armature winding 20a as an armature.
20b is provided, and the armature has two windings that output three-phase power. The armature windings 20a and 20b may be arranged in either a shunt winding type or a tandem type. Then, electromagnetic induction is generated by the rotation of the field winding (rotor), and a voltage is generated in each of the armature windings 20a and 20b. The armature windings 20a and 20b are provided with three output terminals.
Three-phase power is output from 0a and 20b. Generator 3
In the configuration, the rotor is provided with the field winding and the stator is provided with the armature (rotation field type), but the rotor is provided with the armature and the stator is provided with the field winding (rotation field type). Alternatively, the rotor may be provided with a permanent magnet, and the stator may be provided with an armature.

The generator 3 has an automatic voltage regulator (hereinafter referred to as A
VR) 14 is provided to control the power supplied to the field winding. The AVR 14 adjusts the magnitude of the magnetic field excited by the field winding to make the voltage value output from the armature windings 20a and 20b constant.

The three-phase outputs 30a and 30b from the generator 3 are respectively converters 21a and 2 for performing AC / DC conversion.
After being rectified and smoothed by 1b, inverters 6a, 6
It is connected to the DC input part of b. Then, the generated power systems U2 and V2 are output from the inverters 6a and 6b, and the outputs and a commercial power system to be described later are connected to each other. The generator system 1 according to the present embodiment is an embodiment in the case of performing grid interconnection with a single-phase three-wire commercial power system, as shown in FIG. The commercial power system that is grid-connected to the generator system 1 is not limited to a single-phase three-wire system, and may be grid-connected to a three-phase three-line commercial power system.

From the external commercial power supply 40, a single-phase three-wire 200
V commercial power system U1, O1, V1 is pulled. There is a potential difference of 200 V between the commercial power system U1 and V1, the commercial power system O1 is a neutral line, and the commercial power system U1
・ 100V between O1 and commercial power system O1 ・ V1
The potential difference is generated. Commercial power system U1
V1 is the power generation system U2 · V from the generator system 1.
2 are connected in parallel. The potential difference between the generated power system U2 and V2 is also set to 200V by the inverters 6a and 6b, and the power is supplied by matching the potential difference with the commercial power system U1 and V1. Then, the commercial power system U1 · V1 and the generated power system U2 · V2 are interconnected. The load power grid-connected as described above (load power grid U3
・ O3 ・ V3) is a power consuming device (hereinafter, single-phase load) 2
It is supplied to 4/24 ...

Further, the commercial power system U1, V1 is provided with current transformers CT1, CT2, and the single-phase loads 24, 24, ... Are passed through the commercial power system U1, V1.
· The current value of the commercial power supplied to the inverter 6a
It is detected by. Commercial power system U1 ・ V1
Current value changes according to the power consumption of the single-phase loads 24. And the single-phase load 24, 24,
..In order to stably supply electric power (load power) to the side,
The generated power is supplied from the inverters 6a and 6b so that the value of the load power input to the single-phase loads 24, 24 ... Is constant. Therefore, in accordance with the current value of the commercial power system U1 · V1 detected by the current transformers CT1 · CT2, appropriate generated power is output from the inverters 6a · 6b to the generated power system U2 · V2. .

A plurality of inverters 6a and 6b (two in this embodiment) are connected so as to be communicable by a multi-drop method. The inverter 6a calculates a required output set value (power value) based on the detected current value of the commercial power grid U1 · V1. And the inverter 6a
Also sends the output set value to the other inverter 6b. In the inverter 6b, output control is performed so that the transmitted output set value is obtained.

A specific example of the operation of the generator system 1 performed by the above grid interconnection will be described below. (1) When the power consumption on the single-phase load side increases: The demand power in the load power system U3, O3, V3 increases, and the commercial power flowing through the commercial power system U1, O1, V1 increases accordingly. Here, the load electric power system is a system in which the commercial electric power system and the power generation electric system are system-connected. Then, the increase value of the commercial power of the commercial power system U1, V1 is calculated by the inverter 6a from the current transformers CT1, CT2. The inverter 6a controls the inverters 6a and 6b so as to increase the generated power of the generated power grid U2 and V2 accordingly.

(2) When the power consumption on the single-phase load side decreases: The demand power in the load power system U3, O3, V3 decreases, and the commercial power flowing in the commercial power system U1, O1, V1 decreases accordingly. To do. And commercial power system U1 · V
The reduction value of the commercial power of 1 is the current transformer CT1C
The inverter 6a calculates from T2. Then, the inverter 6a controls the inverters 6a and 6b so as to reduce the generated power of the generated power system U2 and V2 accordingly.

Next, the "hot water energy recovery mechanism" in the generator system 1 will be described. In addition, the hot water energy recovery mechanism includes the primary cooling water passage 8 and the cooling water pump 1.
6, heat exchanger 41, secondary cooling water passage 42, inlet side thermometer 4
4, outlet side thermometer 45, flow meter 46 and hot water storage tank 4
Refers to the generic name of 7 etc.

In the generator system 1, the primary cooling water passage 8
Is formed, and the primary cooling water of the prime mover 4 is circulated in the heat exchanger 41 and the radiator 7 by the cooling water pump 16. The radiator 7 is provided with a radiator fan 7a, and the primary cooling water circulating in the radiator 7 is cooled by driving the radiator fan 7a. The heat exchanger 41 has a secondary cooling water passage 42.
Is provided, and the thermal energy of the primary cooling water is transferred to the secondary cooling water by heat conduction. The secondary cooling water is circulated in the secondary cooling water passage 42 by a circulation pump (not shown), a part of the secondary cooling water passage 42 is drawn into the hot water storage tank 47, and the water stored in the tank 47 is stored. , And the thermal energy of the secondary cooling water at that portion is transferred to the water in the hot water storage tank 47 by heat conduction. In this way, the exhaust heat of the prime mover 4 raises the water temperature of the water in the hot water storage tank 47 into hot water and is recovered as hot water energy. Further, an inlet side thermometer 44 is arranged on the hot water storage tank inlet side of the secondary cooling water passage 42, and an outlet side thermometer 45 is arranged on the hot water storage tank outlet side, and the flowmeter 4 is installed on the inlet side or the outlet side of the secondary cooling water passage 42.
By disposing 6, the amount of exhaust heat generated by the prime mover 4 can be quantitatively grasped. In this embodiment, the thermal energy generated by the exhaust heat of the prime mover 4 is recovered as the hot water energy of the water in the hot water storage tank 47 via the primary cooling water and the secondary cooling water, but the primary cooling water passage 8 is used as the hot water storage tank 47. It is also possible to directly pass through the inside and collect heat between the primary cooling water and the water in the hot water storage tank 47. Further, the cooling of the primary cooling water by the radiator 7 and the radiator fan 7a means that the exhaust heat of the prime mover 4 is not recovered but is discharged to the outside of the generator system 1, which is not essential in maximizing energy efficiency. Absent. However, in use, when the demand (usage amount) of hot water energy is extremely smaller than the demand power (load power) amount, the exhaust heat of the prime mover 4 cannot be fully recovered and the primary cooling water temperature rises. , Prime mover 4
May cause trouble. The radiator 7 and the radiator fan 7a are provided for safety in consideration of such a situation.

A power management system using the control system 2 will be described below. The control system 2 functions as a control mechanism of the generator system 1 and also controls electric power such as generated electric power and load electric power, and hot water energy obtained by recovering exhaust heat generated by the prime mover 4. Functions as a thermal energy management system. The control unit 5 of the control system 2 controls the drive of each device constituting the generator system 1, and also controls the electric power value (kW) and electric energy value (kWh) of each electric power system, hot water energy (kW) and hot water energy. The recovery amount (kWh) can be calculated and stored. The control unit 5 is provided with a memory as a storage unit and an arithmetic unit (CPU) as a calculation unit.

Regarding the electric power in the generator system 1,
The following two data are directly detected. The inverter 6a is, as described above, the current transformer CT1.
The current value (A) of the commercial power can be detected via CT2. The detection data relating to the commercial power thus detected is transmitted from the inverter 6a to the control unit 5 and stored in the control unit 5. Further, the inverters 6a and 6b can detect the current value (A) of the generated power that is output by being converted in power by the inverters 6a and 6b by using the circuits provided in these devices. Then, the detection data relating to the generated power detected in this way is also transmitted to the control unit 5 and stored in the control unit 5.

In the generator system 1, the following three data are directly detected regarding hot water energy.
That is, an inlet-side thermometer 44 is provided on the hot-water storage tank inlet side of the secondary cooling water passage 42, and an outlet-side thermometer 45 is provided on the hot-water storage tank outlet side, so that the secondary cooling water inlet-side temperature T1 (° C) and outlet-side temperature Detect T2 (° C). Further, a flow meter 46 is arranged on the inlet side or the outlet side of the secondary cooling water passage 42 to detect the secondary cooling water flow rate L (liter / second). These detection data are transmitted and stored in the control unit 5. Flow meter 4
6 can be omitted from the characteristics of the circulation pump (not shown), and the flow rate may be input in some cases.

Next, the data regarding the electric power calculated based on the detection data will be described. The combined power of the commercial power of the commercial power supply system U1 and V1 and the generated power system U2 and V2 is the load power of the load power system U3 and V3. The control unit 5 can calculate the load power value by performing calculation in the calculation device based on the detection data regarding the commercial power value and the generated power value. The calculated data regarding the load power value is stored in the control unit 5.

The control unit 5 can calculate each amount of electric power by detecting and calculating the data regarding each electric power. The electric power amount (kWh) is given as a time integral of the electric power (kW), and in this embodiment, it is supplied to the load side every predetermined time (in this embodiment, one hour) within the predetermined time. The amount of electric power is calculated by the control unit 5. Then, the commercial power amount and the generated power amount are calculated in the control unit 5 from the detected commercial power value and the generated power value, and the load power amount is calculated from the calculated load power value. The calculated data regarding each of these electric power amounts is stored in the control unit 5.

Next, data relating to hot water energy calculated based on the detection data will be described. That is, the secondary cooling water inlet side temperature T1 which is the detected data
(° C), outlet side temperature T2 (° C) and secondary cooling water flow rate L
(Liter / sec) and the specific heat of water K (kJ / liter · ° C) which is a constant, the warm water energy per unit time recovered in the water in the hot water storage tank 47 (kW = kJ / sec)
Is calculated as K × (T1−T2) × L. The hot water energy recovery amount (kWh) can be calculated by time integration of the hot water energy (kW) per unit time.

In summary, the detection data regarding the commercial power value and the generated power value detected by the inverter 6a are transmitted to the control unit 5 and stored in the control unit 5. The control unit 5 also calculates the load power value, the commercial power amount, the generated power amount, and the load power amount from the detection data, and these calculated data are also stored in the control unit 5. On the other hand, the inlet side thermometer 44 and the outlet side thermometer 4
5. The detection data regarding the hot water energy by the flow meter 46 is also transmitted to the control unit 5 and stored in the control unit 5. The control unit 5 also calculates hot water energy and hot water energy recovery amount from the detection data, and these calculated data are also stored in the control unit.

Further, the fuel flow meter 50 detects data relating to the fuel consumption of the prime mover 4, transmits the data to the control unit 5, and outputs a known fuel unit price (yen / cubic meter or yen / liter) to the control unit. Enter in 5,
Fuel cost (yen / month or yen / hour) as the product of these
Can be calculated.

As described above, since the generator system 1 including the inverters 6a and 6b for system interconnection and the hot water energy recovery mechanism is configured, the prime mover 4 and the generator 3 are provided.
Compared to the case where a generator system is configured by attaching an inverter for grid interconnection to an existing generator unit mainly for, the entire device can be made compact,
It can have an appropriate size (space). Also,
Since the generator system 1 in which the grid interconnection inverters 6a and 6b and the hot water energy recovery mechanism are integrated is configured, each device of the generator system 1 is controlled by the same control unit 5, and the generator is By simply using the control system of the system 1, a power / heat energy management system can be configured without adding a new device. Therefore, it leads to cost reduction and does not require a new installation space.

The operation display unit 28 includes input means for transmitting a control command to the control unit 5, and the control unit 5.
It is an input / output unit that also serves as an output unit for receiving data transmission from. In particular, the operation indicator 28 is one element that constitutes the generator system 1, and is provided inside or on the surface of the generator system 1. The control unit 5 is provided with an output terminal for data communication, and the operation indicator 28, which is an input / output unit, can communicate with the control unit 5 via a wired signal line, as shown in FIG. It is connected to the. The operation indicator 28 can be provided at a position separated from the control unit 5 to form a remote control panel.
Further, the input / output unit 28 may be a general-purpose personal computer 35 that is generally distributed.

Further, the control unit 5 of the generator system 1
In order to connect the remote monitoring system (central remote monitoring center) of the manufacturer with the overall operation display 29, the generator system 1 is provided with a communication adapter 31 for wireless communication, and the generator system 1 also communicates with the remote monitoring system. An adapter 31 is provided. The control unit 5 enables two-way communication via the communication adapters 31 and 31 toward the general operation display 29 located at a remote place apart from the installation location of the generator system 1. Integrated operation display 29
Is an operation indicator provided outside the generator system 1, whereas the operation indicator 28 is provided inside or on the surface of the generator system 1. The communication means between the control unit 5 and the general operation display device 29 is not limited to wireless communication, but may be wired communication using a communication line such as a telephone line.

Therefore, the electric power-related data such as the detection data and the calculated data stored in the control unit 5 are
It can be transmitted to the operation display unit 28 and the general operation display unit 29 which are the input / output means of the control unit 5. Further, the operation display unit 28 is a remote monitoring panel installed apart from the control unit 5, or the general operation display unit 2 of the remote monitoring system.
It can be nine. Therefore, from the position separated from the control unit 5, it is possible to confirm each of the above-mentioned data (data regarding electric power) and to manage the electric power of the generator system 1. Further, in the present embodiment, data can be transmitted from the integrated control unit 5 to both the operation indicators 28 and 29, but it is also possible to transmit to only one of them.

Image display device 32 provided on the operation display 28
The chart displayed in FIG. 2 will be described with reference to FIGS. Further, the following configuration is the same in the general operation display unit 29.

The operation display 28 which is an input / output means is provided with an image display device 32, and based on a processing program built in the operation display 28, each of the above-mentioned data is made into a chart,
It is configured so that it can be displayed on the image display device 32.

In this embodiment, the current value of the commercial power source 40 is detected by the current transformers CT1 and CT2, and the generator 3
The generated current value of is detected by the circuit inside the inverters 6a and 6b, but the present invention is not limited to this method. Further, the detection data regarding the electric power value and the hot water energy is calculated by the control unit 5 so that the calculation data regarding the electric power value / hot water energy and the electric energy / hot water energy recovery amount is calculated. The method is not limited to this. For example, the detection data may be transmitted to the operation display unit 28 serving as the input / output unit, and the calculation data may be calculated based on the arithmetic unit and the processing program provided inside the operation display unit 28. Good.

First, commercial / power generation / by time zone shown in FIG.
A comparison table of the load power amount, the hot water energy recovery amount, the virtual load power amount, and the fuel consumption amount will be described. By the action of the processing program, commercial power amount, generated power amount, load power amount, hot water energy recovery amount, which are the calculated data,
A list in which the virtual load electric power amount and the fuel consumption amount are arranged for each unit time can be displayed on the image display device 32.
As described above, each of the electric power amounts is the electric power amount calculated for each hour in the present embodiment, and thus the electric power amounts are also arranged for each hour in the list. In addition, when the generator for distributed power supply of the present invention is not introduced, it is necessary to cover all the electric power required for the electric power consuming equipment (including the device for generating hot water) with commercial electric power. As the “virtual” load electric energy, the “virtual load electric energy” is defined as a value obtained by combining three of the commercial electric energy, the generated electric energy, and the hot water energy recovery amount.

With such a configuration, the user of the generator system 1 can recognize the amount of electric power generated by the generator 3, can actually feel the effect of the purchased generator system 1, and consume it. Person satisfaction is increased.

Next, an embodiment of the comparison table of monthly commercial / power generation / load power amount, hot water energy recovery amount, virtual load power amount and fuel consumption amount shown in FIG. 3 will be described. By the action of the processing program, the calculated data, which is the hourly commercial power amount, the generated power amount, the load power amount, the hot water energy recovery amount, the virtual load power amount, and the fuel consumption amount, are totaled for each month. It is possible to calculate the respective electric power amounts and the energy amounts, and to make a list of the corresponding relationships between the monthly electric power amounts and the charges and display them on the image display device 32. The unit price per kWh of the commercial power (purchased power purchase cost) shown in FIG. 3 is stored in advance in the operation display unit 28 in response to the information provided by the commercial power supply side (electric power company). Further, the unit price per kWh of generated power is calculated by the cost of fuel required for driving the prime mover 4, etc., and is calculated by the control unit 5 by detecting / transmitting data regarding increase / decrease in fuel consumption. Is. The cogeneration system of the present invention is introduced by comparing the monthly charge (yen / month) of the virtual load power in FIG. 3, the monthly charge of the commercial power, and the sum of the monthly charge of the generated power and the hot water energy. It is possible to easily understand the energy cost reduction amount (cost merit) due to the above. Further, when calculating the unit price per month of generated power and hot water energy and the monthly charge, data such as equipment purchase cost, incidental construction cost, management and maintenance cost, repair cost, personnel cost, etc. relating to the generator for distributed power source of the present invention. By adding (various expenses), it becomes possible to make more precise forecasts regarding the recovery period of capital investment costs, which deepens user recognition and improves satisfaction. The unit price per kWh of generated power and hot water energy is calculated by the following formula. (Unit price per kWh of generated power and hot water energy (yen / kWh)) = (fuel cost (yen / month)) / (sum of monthly usage of generated power and hot water energy (kWh /
(Month)) Although the example of FIG. 3 shows the case of monthly comparison, it is also possible to perform daily comparison and yearly comparison.

An example of a graph of commercial / generated electric energy and hot water energy recovery by time zone shown in FIG. 4 will be described. The graph of FIG. 4 is a graph of the comparison table shown in FIG. The horizontal axis shows the change of time in units of one hour, and the vertical axis shows the change of each electric energy.

With such a configuration, the user can compare the amount of power supplied to each power system on an hourly basis. It is possible to know at what time of day the load power is increasing or decreasing within a day, and it is also possible to know the power generation pattern and the like that will reduce the cost most depending on the contract contents with the electric power company. Therefore, the user can recognize the capital investment effect of the generator system 1.

An embodiment of the monthly commercial / generated electric power amount and hot water energy recovery amount graph shown in FIG. 5 will be described. The graph of FIG. 5 shows the comparison of commercial / generated electric energy and the increase / decrease of load electric energy for each month. The horizontal axis shows the change of time in units of one month, and the vertical axis shows the change of each electric energy.

With this configuration, the user can compare the amount of power supplied to each power system on a monthly basis. It is possible to know in which month the load power has increased or decreased within a year, and it is also possible to know the power generation pattern that will result in the most cost reduction according to the contract content with the power company. Therefore, the user can recognize the capital investment effect of the generator system 1.

An embodiment of the system conceptual diagram shown in FIG. 6 in which each current electric quantity is displayed will be described. By the operation of the processing program, a conceptual diagram of each power system can be displayed on the image display device 32, and the power value supplied by each power system can be displayed on the conceptual diagram in association with each power system. Is. Each electric power value, hot water energy, and fuel consumption amount displayed on the image display device 32 are obtained by directly displaying the detection data and the calculated data,
It is updated at every detection timing of the commercial current value and the generated current value by the inverter 6a. That is, changes in each current value and power value are displayed on the image display device 32 in real time. The “generated energy” in FIG. 6 is the amount of energy (electrical energy and recovered hot water energy) that can be used among the various types of energy generated from the generator, and is the weight of fuel used per unit time and This is an important value for knowing the energy efficiency of the generator (= (generated energy) / (fuel combustion energy) × 100 (%)) together with the combustion energy per unit weight of the fuel.

With such a configuration, the user can check the change in the supplied power of each power system, which is changing every moment, and the consumer satisfaction can be improved. Further, since the supplied power value is displayed in correspondence with the conceptual diagram, it becomes easier for the user to grasp the state of power supply as an image, and consumer satisfaction is enhanced.

An embodiment of the system conceptual diagram shown in FIG. 7 in which the amount of electricity and the amount of energy for each month are displayed will be described. By the action of the processing program, the image display device 3
A conceptual diagram of each electric power system is displayed on 2 and the monthly electric energy, hot water energy recovery amount and fuel consumption amount supplied by each electric power system are displayed on the conceptual diagram in association with each electric power system. It is possible. The monthly electric energy is the same as the case of the comparison table of commercial / power generation / load electric energy, hot water energy recovery amount, and virtual load electric energy for each month shown in FIG.
Each hourly electricity amount and hot water energy recovery amount, which are calculated data, are summed up for each month to calculate each electricity amount for each month.

With such a configuration, it is possible to check the amount of power supplied by each power system for each month, and consumer satisfaction can be improved. In addition, since the amount of power supplied and the amount of hot water energy recovered are displayed in correspondence with the conceptual diagram, it becomes easier for users to grasp the comparison of monthly amounts of power and hot water energy recovered as an image, and consumer satisfaction Is increased. The comparison period is not limited to the monthly period, and may be a daily unit or an annual unit.

The operation display unit 28, which is an input / output unit of the control unit 5, is also configured to be usable as an output unit for taking out the respective data to the outside of the generator system 1. The operation display 28 is an IC which is a data storage means.
An output mechanism to a card (card-shaped device) 33 is provided, and an output mechanism to a printer 34 which is a data recording means is provided. Then, each of the data is stored in the IC card, the numerical information of each of the data is printed on the printer 34, and the chart (FIGS. 2 to 7) is used.
Etc.) can be output as an image.

With such a configuration, the IC card 33 can collect each of the above-mentioned data, and the data can be read even by a device that is not communicably connected to the generator system 1. In particular, the control unit 5
In the case of performing data processing different from the processing program stored in the operation display unit 28 or the operation display unit 28, a computer having such a processing program is caused to read data via the IC card 33, so that various power consumption can be obtained. Data processing for management is possible. Further, by printing the numerical information of each of the above-mentioned data on the printer 34 or outputting the chart as an image, the user can confirm the state of the power supply or the change in the power amount at the position where the operation display 28 is arranged. You can In particular, when the printer 34 is provided, the printer 3 is mainly used to confirm the data and the tabulated data.
It is possible to reduce the cost of the image display device 32 by reducing the size of the image display device 32 having a liquid crystal screen, for example.

Further, the control unit 5 of the control system 2
By installing an abnormality detection program inside the operation display device 28 or inside the personal computer 35 or the general operation display device 29 outside the generator main body, an unexpected accident or a device defect can be instantaneously performed by a maintenance / administrator (user, It is possible to respond immediately by notifying the manufacturer or a third party who performs maintenance / management. For example, the ratio between the generated power value and the hot water energy value does not change significantly unless the device is abnormal.
However, if the inlet side thermometer 44, the outlet side thermometer 45, or the flowmeter 46 fails, the value of the hot water energy will show an abnormally large value, a small value, or cannot be displayed. Further, if deposits adhere to the inner walls of the primary cooling water channel 8 and the secondary cooling water channel 42 in the heat exchanger 41, the flow rate of the flow meter 46 may be reduced, or the inlet side temperature T1 may be an abnormally high value. The frequency of rotation of the radiator fan 7a is increased to prevent the primary cooling water temperature from rising abnormally. By constantly causing the abnormality detection program to monitor the balance of the sizes of the detected data and calculated data and the size of various data, the abnormality of the generator can be detected instantaneously. When an abnormality is detected, the generator is activated by wire or wirelessly to activate a reporting device 48 (preferably located near the maintenance / administrator) provided on the main body surface or at a remote position. The operation display device 28, the personal computer 35 outside the generator main body, or the integrated operation display device 29 displays the details of the abnormality and the possible failure / defective portion candidates, so that a quicker countermeasure can be taken. The notification device 48 may be any device as long as it stimulates and senses the human five senses such as sound, light, and vibration, and the method is not limited. As a result, not only is it effective for safety in introducing and using the generator system 1 by a user who has little knowledge about machinery, but also the effect of minimizing the reduction in energy cost merit due to the suspension of the generator system 1 is obtained. is there.

Regarding the operation method of the generator system 1,
A user can always manage and change the operating conditions of the generator system 1 from a position near or far from the system 1, but a typical operating pattern considered to be frequently used in the control system 2. You can prepare several programs in advance and select the one that suits your usage situation from among them, or you can install a program with a learning function to load the environment from the user's usage situation or the total load. The operating conditions may be automatically controlled so as to minimize the power cost. With such a configuration, even if the user who has little knowledge of the machine uses the generator system 1, it is possible to easily use the generator system 1 under the optimum operating condition, and the satisfaction of the consumer is improved. Leads to.

[0058]

According to the first aspect of the present invention, the commercial power source detected by the inverter of the generator and the data on the generated power value of the generator and the sensors arranged in the hot water energy recovery mechanism detect the data. The data regarding the hot water energy is transmitted to the control system, and the control system calculates data such as commercial power amount, generated power amount, load power amount combining the commercial power amount and generated power amount, hot water energy, and energy efficiency. Since the calculated data is displayed on the display means arranged on the surface of the generator body, the cogeneration system can be used as an existing generator,
Compared to the case where the heat recovery system and the control mechanism are combined, the entire apparatus can be made compact and appropriate. Also, since the generator system that integrates the grid interconnection inverter is configured, each device of the generator system is controlled by the same control unit, and it is only necessary to use the control system of the generator system. The power / thermal energy management system can be configured without adding a new device. Therefore, it also leads to cost reduction. further,
By making it possible to display various calculation data relating to the electric power value and hot water energy, the user can easily obtain information on cost merit without making complicated calculations.

As described in claim 2, data such as flow rate and weight of fuel (gas, liquid) for operating the power source (motor) of the generator is transmitted to the control system, and the control system consumes fuel. Since the amount is calculated and the calculation data is configured to be displayed on the display means arranged inside or on the surface of the generator, the unit price of electric power generated by the generator and the unit price of hot water energy are based on the actual data. It is possible to grasp more accurately, feel the effects of the cogeneration system, and increase consumer satisfaction.

According to a third aspect of the present invention, the display means, the storage medium or the output device located at a position distant from the generator main body,
Since the calculation data is configured to be transmitted, displayed, or recorded wirelessly or by wire, the user of the generator system can recognize the amount of power generated by the generator, the amount of hot water energy recovered, etc. even at a position away from the generator. And analyze
It can also be recorded. Therefore, the cogeneration system can be used more efficiently, the effect of the cogeneration system, which is a product purchased by the user, can be realized, and consumer satisfaction can be enhanced.

As described in claim 4, since the operating condition of the generator can be set or changed by the display means located away from the main body of the generator, the operating condition of the generator is changed every time the operating condition is changed. It is possible to use the generator more comfortably and efficiently without having to move to the vicinity.

According to a fifth aspect of the present invention, an abnormality related to the generator device is detected from the calculated data, and maintenance of the generator is performed.
Since a mechanism to notify the administrator is provided, it is possible to quickly respond to equipment abnormalities, and even if the user has little knowledge about the machine, purchase the generator system with peace of mind and use it safely. It is possible to minimize the reduction in energy cost merit due to the stoppage of the generator system.

As described in claim 6, a generator system system conceptual diagram in which the calculated data is displayed as a list or schematically on the display means located on the surface of the generator body or at a position distant from the generator body. Since the configuration is displayed above, it becomes easier for the user to grasp the operating status of the cogeneration system and the cost merit as an image, and consumer satisfaction is increased.

According to a seventh aspect of the present invention, the generator control system controls the generator so that the load on the environment or the total electric power cost is minimized based on the calculated electric energy and the data on the hot water energy. Since a mechanism for automatically controlling the operating conditions is provided, the user can use the cogeneration system under the optimal operating conditions for the usage method and purpose, without having to perform complicated calculations based on various calculation data of the cogeneration system. Is possible.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a generator system 1.

FIG. 2 is a diagram showing an example of a comparison table of commercial / power generation / load power amount, hot water energy recovery amount, virtual load power amount, and fuel consumption amount by time zone.

FIG. 3 is a diagram showing an example of a comparison table of commercial / power generation / load power amount, hot water energy recovery amount, virtual load power amount, and fuel consumption amount by month.

FIG. 4 is a diagram showing an example of a graph of commercial / generated electric energy and hot water energy recovery by time zone.

FIG. 5 is a diagram showing an example of a graph of commercial / generated electric energy and hot water energy recovery by month.

FIG. 6 is a diagram showing an example of a system conceptual diagram displaying current electric power amounts.

FIG. 7 is a diagram showing an example of a system conceptual diagram displaying each amount of power and energy for each month.

[Explanation of symbols]

1 generator system 2 control system 3 Generator (for distributed power supply) 4 prime mover 5 control unit 6a ・ 6b (for system interconnection) inverter 8 primary cooling channels 16 Cooling water pump 28 Operation display 33 IC card (data storage means) 34 Printer (data recording means) 42 Secondary cooling water channel 44 Inlet thermometer 45 Exit side thermometer 46 Flowmeter 47 Hot water storage tank

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masayoshi Tokiwa             1-32 Yanma, Chayamachi, Kita-ku, Osaka-shi, Osaka             ー Diesel Co., Ltd. (72) Inventor Toshiaki Fujisawa             1-32 Yanma, Chayamachi, Kita-ku, Osaka-shi, Osaka             ー Diesel Co., Ltd. (72) Inventor Tadanatsu Kanemoto             1-32 Yanma, Chayamachi, Kita-ku, Osaka-shi, Osaka             ー Diesel Co., Ltd. (72) Inventor Hiroshi Yoshimoto             4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture               Within Osaka Gas Co., Ltd. F term (reference) 5G066 HA13 HA30 HB01 HB02 JA07                       JB06                 5H590 AA02 CA26 CC01 CD01 CD03                       CE01 EA14 EB02 EB14 FA01                       FA05 GA06 GA10 HA02 HA04                       HA06 HA12 HA18 KK01 KK04

Claims (7)

[Claims] 1. A commercial power system and a power generation system by a generator for a distributed power source can be interconnected by an inverter, and thermal energy generated from a power source of the generator is
In a generator system having a mechanism for recovering hot water energy from cooling water of the power source, data on a commercial power source detected by an inverter of the generator and a generated current value of the generator, and the hot water energy recovery mechanism. Data on hot water energy detected by the provided sensors and the like are transmitted to the control system, and the control system causes commercial power amount, generated power amount,
Data such as load electric energy, hot water energy, energy efficiency, etc. that combine commercial electric energy and generated electric energy are calculated, and the calculated data is displayed on a display means arranged inside or on the surface of the generator body. Cogeneration system to do. 2. Data such as flow rate and weight of fuel (gas, liquid) for operating a power source (motor) of a generator is transmitted to a control system, and the fuel consumption amount is calculated by the control system to generate power. The cogeneration system according to claim 1, wherein the calculation data is displayed on a display means arranged inside or on the surface of the machine body. 3. The calculation data is transmitted, displayed or recorded wirelessly or by wire to a display means, a storage medium or an output device located at a position distant from the main body of the generator. The cogeneration system described in. 4. The cogeneration system according to claim 1, 2 or 3, wherein the operating condition of the generator can be set or changed by a display means located at a position distant from the main body of the generator. 5. A mechanism for detecting an abnormality related to a device of the generator from the calculated data and notifying a maintenance / administrator of the generator is provided.
The cogeneration system described in. 6. The calculation data is displayed as a list or on a schematic view of a generator system system conceptually on a display means located on the surface of the generator main body or away from the generator main body. Claims 1, 2, 3
-The cogeneration system described in 4 or 5. 7. The generator control system automatically controls the operating conditions of the generator based on the calculated electric energy and data on hot water energy so as to minimize the load on the environment or the total electric power cost. The cogeneration system according to claim 1, 2, 3, 4, 5, or 6, wherein a mechanism is provided.