JPH08186937A - Power supply system - Google Patents

Abstract

PURPOSE: To utilize energy from the standpoint of both the user and supplier of the energy efficiently by combining three kinds of power sources, namely, the commercial power supply system, solar power generation and a generator using fuel, and using the power sources. CONSTITUTION: If power load 11 <= the maximum the amount of power generation in a power generator using fuel (generator) 9, a switch 13 is connected to a terminal 17 on the side of the generator 9, and the generator 9 is operated. The power of the generator 9 is supplied into the power load 11. The power generated in a solar power generator 1 is all made to reversely flow into a commercial power source 5. If power load 11 > power the maximum power generation in the generator 9, the switch 13 is connected to a terminal 15 on the side of an inverter 3, and the generator 9 stops the operation. The power generated in the solar power generator 1 is converted into the AC power with the inverter 3, and the power is supplied into the power load 11 through a distribution board 7 together with the commercial power source 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply system.

[0002]

2. Description of the Related Art A so-called cogeneration system is one in which a power generation facility is installed for each energy consumer to extract electric power energy and thermal energy. An operation method of a cogeneration system focused on energy saving, and a cogeneration system itself are disclosed in Japanese Patent Laid-Open No. 06-
There is a technique disclosed in Japanese Patent No. 86463, and as shown in FIG. 5, there is a technique in which commercial power and private power generation including solar power generation are combined. According to this, the power consumption facility is generated by connecting the power received by the power receiving facility 107 from the power plant and at least the fuel received by the fuel receiving device 109 and the power generated by the in-system power generating device 105 that generates heat to the grid. In the energy supply system that supplies the heat generated by the in-system power generation device 105 to the heat consuming equipment 103 while supplying the energy demand to the power consuming equipment 101, the heat consuming equipment 103, etc. = A x L + b x M + c x N
(A, b, c do not all become 0 at the same time, and a ≧ 0, b ≧
0, c ≧ 0) is the smallest in-system power generation device 1
The operating amount of 05 is calculated by the operating amount calculation means, and the in-system power generation device 105 is controlled by the control means so as to satisfy the operating amount.
Energy is supplied so that the price (L), primary energy consumption (M), and environmental pollutant emission (N) to be borne by energy consumers are optimized in each aspect, and an internal power generation device When the power generation amount of 105 is larger than the power demand amount, it has a means for reversely flowing a part of the power generated from the in-system power generation device 105, and the power consumption facility 101
It is stated that the amount of electric power received in the power receiving equipment 107 and the amount of electric power to be obtained by the in-system power generation device 105 can be reduced as much as possible by connecting a solar cell to the.

[0003]

However, in consideration of applying such an energy supply system to relatively small-scale energy consumers such as ordinary households, the law and system of power supply as of the filing date of the present invention are taken into consideration. In this case, when a rotating device such as an engine or a turbine is used as the in-system power generation device 105 and a solar power generation is connected, considering the reverse flow, the purchase price of the power on the commercial power side is different, and the power consumption facility 101 is simply used. It is not realistic to perform reverse power flow simply by connecting the solar cell to the solar cell, and when connecting to so-called low-voltage commercial power in a small-scale energy consumer, reverse the DC power generation equipment of the solar cell and fuel cell. Although it is permitted to convert to alternating current using a conversion device and then connect it to the AC, it is not possible to connect AC generators with rotating equipment of 50 kW or less. Is, for example, (the company) NEC Kyokai "distributed power system interconnection technical guidelines" (JEAG9701-19
There is no description in the technical guideline for system interconnection such as 93), and there is a problem that it is unclear whether or not the conventional system interconnection is possible.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a power supply system capable of effectively utilizing energy from the viewpoint of both the energy consumer and the energy supplier. To provide.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a commercial power source, a solar power generation device, and a power generation device using fuel, and the solar power generation device and the solar power generation device. In a power supply system in which a commercial power supply is grid-connected and a power generation device that uses the fuel is separated from the solar power generation device and the commercial power supply system, the power load of the energy consumer ≤ fuel is used In the case of the maximum power generation amount of the power generation device to be operated, the power generation device using the fuel is operated,
The electric power generated by the power generator using the fuel is supplied to the electric power load, and all the electric power generated by the solar power generator flows backward to the commercial power source, and the electric power load of the energy consumer> fuel is used. In the case of the maximum power generation amount of the power generation device, the power supply system is characterized in that the power generated by the solar power generation device and the power from the commercial power source are supplied to the power load.

[0006]

The present invention utilizes the three types of power sources, namely commercial power, photovoltaic power generation, and a power generation device that uses fuel, in combination, so that the drawbacks of the solar power generation device in which the power generation amount is easily influenced by the weather In addition, the power energy that matches the power load of the energy consumer is supplied from the optimum power source, and when the energy load of the energy consumer is low, the surplus power of the photovoltaic power generation is reversely flowed to the commercial side to reverse the commercial power supply. It is possible to contribute to the peak cut by using unused energy, and when the power generator that uses fuel operates, it is possible to recover the heat generated from the power generator and use it for heating and hot water supply. It enables comprehensive effective use.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 are schematic configuration diagrams of a power supply system according to an embodiment of the present invention. As shown in FIGS. 1 and 2, the photovoltaic power generation device 1 is connected to the inverter 3. A commercial power supply 5 and a terminal 15 are connected to the inverter 3. The switch 13 connected to the distribution board 7 switches between the terminal 15 on the side of the inverter 3 and the terminal 17 on the side of the power generator 9 that uses fuel. The distribution board 7 is connected to an electric power load 11 of an energy consumer.

The solar power generation system 1 converts light energy into electric energy. The inverter 3 converts the DC power generated by the solar power generation device 1 into AC power. The commercial power source 5 is a power source supplied from a power company or the like for a fee.
The distribution board 7 is for branching and supplying electric power to the load in the energy consumer. Power generator 9 that uses fuel
In the case of a gas engine or a gas turbine, a gas fuel such as city gas is burned to obtain a rotational force, and the obtained rotational force rotates a DC or AC generator to obtain electric energy. The diesel engine is similar to the gas engine except that the fuel is liquid fuel such as light oil. The switch 13 is switched according to the magnitude relationship between the amount of power generated by the power generator 9 that uses fuel and the power load 11.

Next, the operation of this embodiment will be described. As shown in FIG. 1, when the power load 11 ≦ the maximum power generation amount of the power generation device 9 using fuel, the switch 13 is connected to the terminal 17 of the power generation device 9 side using fuel, and the power generation device using fuel is used. Drive 9 Electric power generated by the power generation device 9 that uses fuel is supplied to the power load 11 via the distribution board 7, and all the power generated by the solar power generation device 1 flows backward to the commercial power supply 5.

As shown in FIG. 2, when the power load 11> the maximum power generation amount of the power generator 9 using fuel, the switch 13 is connected to the terminal 15 on the inverter 3 side, and the power generator 9 using fuel is Stop its operation. The electric power generated by the solar power generation device 1 is converted into AC power by the inverter 3 and is supplied to the electric power load 11 via the distribution board 7 together with the electric power from the commercial power supply 5.

As described above, according to this embodiment, the power load 1
According to the size of 1, the system of the power generation device 9 that uses fuel and the system of the solar power generation device 1 and the commercial power supply 5 are switched to supply power to the power load 11. When the surplus power of the solar power generation device 1 is reversely flown to the commercial power supply 5 and the power supply from the commercial power supply 5 does not use the power generation device 9 that uses fuel, for example, the power load 11 uses fuel. Since it is limited to when the power generation amount of the power generation device 9 is larger than the maximum power generation amount or at the time of periodic inspection, it can contribute to leveling the power supply amount of the electric power company and cutting the peak. Further, when the surplus power is reversely flown to the commercial power source 5, since the power generator 9 that uses fuel is disconnected from the power supply system, whether or not it is described in the above-mentioned "Distributed power system interconnection technical guideline". Regardless of this, grid interconnection and reverse power flow are possible. Also,
By appropriately setting the capacity of the power generation device 9 that uses fuel, the amount of power generation equipment of the solar power generation device 1 can be reduced, and the solar panel installation area of the solar power generation device 1 is reduced, so there are less restrictions on installation. It also has the advantage that

Further, as shown in FIG. 3, a heat exchanger 18 is connected to the power generator 9 that uses fuel, and the power generator 9 that uses fuel when the power generator 9 that uses fuel is operating. For example, in the case of a gas engine, the heat generated by is recovered and taken out by the gas engine cooling water, and the hot water can be obtained by exchanging heat with the city water through the heat exchanger 18. Further, effective use of energy can be achieved. Be peeled off.

Further, as shown in FIG. 4, the exhaust heat utilization device 1 is connected to a power generation device 9 using fuel via a heat exchanger 18.
9 is connected, and when the power generating device 9 that uses fuel is operating, the heat generated by the power generating device 9 that uses fuel is used for exhaust heat utilization equipment 19, such as floor heating, through the heat exchanger 18. Alternatively, it can be used for an exhaust heat input type absorption refrigerator.

[0014]

As described above in detail, according to the present invention, it is possible to use energy more effectively from the viewpoints of both the energy demander and the energy supplier, and it is possible to consume the primary energy. Can be reduced, which can contribute to environmental protection and energy saving.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a power supply system according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a power supply system according to an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a power supply system according to another embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a power supply system according to another embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of a conventional cogeneration system.

[Explanation of symbols]

 1 ………… Solar power generator 3 ………… Inverter 5 ………… Commercial power supply 7 ………… Distribution panel 9 ………… Power generator using fuel 11 ………… Power load 13 ………… Switch 15,17 ……… Terminal

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location H02P 9/04 K J F

Claims (4)

[Claims] 1. A power generation system that includes a commercial power supply, a solar power generation device, and a power generation device that uses fuel, wherein the solar power generation device and the commercial power source are system-connected, and that uses the fuel. In a power supply system in which the device is separated from the photovoltaic power generator and the grid of the commercial power source, when the power load of the energy consumer ≤ the maximum power generation amount of the power generator that uses fuel, power generation that uses the fuel The electric power generated by the power generator that uses the fuel is supplied to the electric power load, and all the electric power generated by the solar power generator flows backward to the commercial power source. When the load is greater than the maximum power generation amount of the power generation device that uses fuel, the power supply system is characterized in that the power generated by the solar power generation device and the power from the commercial power supply are supplied to the power load. 2. The power supply system according to claim 1, wherein the power generator that uses the fuel is a power generator that uses a gas engine as a power source. 3. The power supply system according to claim 1, wherein the power generator using the fuel is a power generator using a gas turbine as a power source. 4. The power supply system according to claim 1, wherein the power generator that uses the fuel is a power generator that uses a diesel engine as a power source.