Emergency power supply system

Abstract

It is easier to ensure a load size that can supply power during emergencies. [Solution] The emergency power supply system 100 is electrically connected to the power grid 90 that normally supplies power to the facility. A gas power generator 111 and a power storage unit 121 are installed as emergency power supply devices. These devices can supply power in an emergency to loads 202 and 302, including household electrical appliances, within the facility that are normally supplied with power from the power grid 90, through the wiring that supplies power. The emergency power supply system 100 includes a harmonic reduction unit 140 connected to the wiring that reduces harmonic currents generated in household electrical appliances.

Description

Technical Field

[0001] The present invention relates to an emergency power supply system.

Background Art

[0002] Patent Document 1 relates to a system that provides a distributed power source such as a gas power generation in a condominium house (corresponding to a fuel power generation device of the present invention, etc.) and reduces the electricity bill related to the power consumed in a customer facility or the like.

Prior Art Documents

Patent Documents

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, there has been a demand for a system that uses a distributed power source such as a fuel power generation device or a storage battery as an emergency power source. Patent Document 1 (Claim 15) describes that the distributed power source can supply power to at least the common part of the facility during a power outage. Such a distributed power source is required to ensure, as much as possible, the magnitude of the load that can supply power in an emergency with limited equipment.

[0005] An object of the present invention is to provide an emergency power supply system that can easily ensure the magnitude of the load that can supply power in an emergency.

Means for Solving the Problems

[0006] As a result of diligent research, the inventors have concluded that harmonic currents generated by household electrical appliances installed within a facility are one of the factors that reduce the size of the load that can be powered. Harmonic currents lead to an increase in reactive power. Under normal circumstances, this is not a major problem when reactive power is supplied from the power grid. However, in emergencies, because the equipment and scale of facilities that can supply power are limited, even if the active power consumed by the emergency load is not very large, the increase in reactive power may cause the apparent power to exceed the allowable output of the entire system.

[0007] Therefore, the emergency power supply system of the present invention is an emergency power supply system electrically connected to a power system that normally supplies power to a facility, and comprises at least an emergency power supply device capable of supplying power to the facility in an emergency, wiring that supplies power from the emergency power supply device in an emergency to household electrical appliances in the facility that normally receive power from the power system, and harmonic reduction means connected to the wiring that reduces harmonic currents generated in the household electrical appliances.

[0008] According to the present invention, the increase in reactive power is suppressed because harmonic currents are reduced. This makes it possible to realize an emergency power supply system that can easily secure a load size that can be powered during an emergency.

[0009] Furthermore, in the present invention, it is preferable that the emergency power supply device includes at least one of a fuel power generation device capable of supplying power to the facility by generating electricity using fuel, and a storage battery capable of supplying power to the facility and also capable of storing energy by receiving an electric current. In this case, at least one of the fuel power generation device and the storage battery will supply power to electrical appliances and the like in the facility during an emergency. In this regard, if harmonic currents are left as they are, it will be necessary to consider the increase in reactive power due to harmonic currents and to suppress the output of the fuel power generation device and the storage battery to some extent so as not to exceed the allowable output of the system. However, if these outputs are suppressed, there is a risk that sufficient power supply to the load cannot be secured. In contrast, in the present invention, harmonic currents are reduced by harmonic reduction means. Therefore, the need to suppress the output of the fuel power generation device and the storage battery is reduced. Thus, it is easier to secure sufficient power supply by these devices.

[0010] Furthermore, in the present invention, it is preferable that the facility includes multiple residences, the emergency power supply device includes both the fuel power generation device and the storage battery, and in the event of an emergency, power is supplied from the storage battery to at least one of the multiple residences before the fuel power generation device starts generating power. This allows power supply to the residences to start relatively quickly. In addition, since harmonic currents are reduced by the harmonic reduction means, the need to suppress the output of the storage battery is reduced. Therefore, it is easier to secure sufficient power supply with the output of the storage battery alone. Thus, it is possible to supply power from the storage battery prior to supplying power from the fuel power generation device.

[0011] Furthermore, in the present invention, in the event of an emergency, it is preferable to start power supply from the storage battery to all of the multiple houses before starting power generation from the fuel power generation device. This allows power supply to all of the multiple houses to be secured relatively quickly. In addition, since harmonic currents are reduced by the harmonic reduction means, the need to suppress the output of the storage battery is reduced. Therefore, it is easier to secure sufficient power supply with the output of the storage battery alone. Thus, it is possible to supply power from the storage battery prior to supplying power from the fuel power generation device.

[0012] Furthermore, in the present invention, it is preferable that the storage battery temporarily outputs power exceeding its rated value before the fuel power generation device starts generating power. This allows the storage battery to appropriately compensate for the supply power by outputting power exceeding its rated value at a time when a power supply shortage is likely to occur before the fuel power generation device starts generating power. On the other hand, if reactive power increases due to harmonic currents in addition to such output exceeding the rated value, there is a higher risk that the output of the storage battery will exceed the allowable output of the entire system. In contrast, according to the present invention, the harmonic currents are reduced by a harmonic reduction means, so the above risk is reduced. Therefore, it is easier for the storage battery to output power exceeding its rated value.

[0013] Furthermore, in the present invention, the multiple houses are divided into groups 1 to n (n: a natural number of 2 or more), and in the event of an emergency, it is preferable to start supplying power from the emergency power supply device to all houses included in the kth group, in the order k=1, 2, ..., n, with time intervals between them. This divides the multiple houses into multiple groups, and power supply is started for each group. Therefore, compared to, for example, starting power supply to all houses simultaneously, it is possible to avoid a situation where an excessive load occurs all at once. Consequently, the output of the emergency power supply device is less likely to be insufficient. On the other hand, if reactive power increases due to harmonic currents, it becomes necessary to increase the number of divisions into groups to reduce the size of the load per group. In such cases, increasing the number of groups may cause delays in power supply to groups that are scheduled to receive power later. In contrast, in the present invention, the harmonic reduction means reduces the need to increase the number of divisions into groups. Therefore, it is not necessary to set a large number of divisions into groups, which can cause delays in power supply.

[0014] Furthermore, in the present invention, it is preferable that the harmonic reduction means is a harmonic reactor. This makes it possible to achieve harmonic reduction with a simple configuration. [Brief explanation of the drawing]

[0015] [Figure 1] This is a block diagram illustrating the schematic configuration of a facility in which an emergency power supply system according to one embodiment of the present invention is installed. [Figure 2] This block diagram shows the schematic configuration of the emergency power supply system in Figure 1. [Figure 3] Figure 1 is a flowchart illustrating the operation of the emergency power supply system during a power outage. [Figure 4] This is a block diagram partially showing the schematic configuration of an emergency power supply system according to yet another embodiment of the present invention. [Modes for carrying out the invention]

[0016] [First Embodiment] An emergency power supply system 100 according to a first embodiment, which is one embodiment of the present invention, will be described with reference to Figures 1 to 3. As shown in Figure 1, the emergency power supply system 100 according to this embodiment is a system installed in a multi-unit dwelling such as an apartment building having common areas and private areas A to C. Each of private areas A to C includes multiple individual dwellings. Power supply wiring is drawn from the power grid 90 to each of the common areas and the individual dwellings in private areas A to C. The emergency power supply system 100 is connected to the above power supply wiring. The emergency power supply system 100 operates in both normal and emergency situations. "Normal" refers to a state in which power from the contracted power company can be used for each of the private areas and common areas through the power grid 90, and "emergency" refers to a state in which the supply of power from the power company through the power grid 90 is stopped due to a power outage or the like.

[0017] As shown in Figure 2, the apartment building contains various loads that are supplied by the power grid 90 and the emergency power supply system 100. For example, the common areas contain a regular load 201 and an emergency / combined load 202 (hereinafter sometimes simply referred to as loads 201 and 202). In addition, each of the individual apartments A to C contains a regular load 301 and an emergency / combined load 302 (hereinafter sometimes simply referred to as loads 301 and 302). These loads include various household electrical appliances such as lighting, refrigerators, washing machines, televisions, hair dryers, water heaters, and heaters. They may also include outdoor equipment such as road heating systems. The circuit configurations of the loads and the emergency power supply system 100 in apartments A to C are similar to each other, and Figure 2 only shows an overview of the circuit configuration for apartment A.

[0018] Among the above, the normal load corresponds to devices and equipment such as home appliances that operate during normal times. The load also used during emergencies corresponds to devices and equipment such as disaster prevention lighting and outlets that can operate both during normal times and emergencies. From the incoming section 91 of the power system 90, wiring for supplying power to each of the loads 201, 202, 303, and 304 is installed. Each of the loads 201 and 202 in the shared section is supplied with power from the incoming section 91 through the shared section switchboard 112 described later.

[0019] The emergency power supply system 100 is connected to the wiring 92 for power supply from the incoming section 91. The wiring 92 from the incoming section 91 is connected to the shared section switchboard 112. The shared section switchboard 112 is a device that distributes the input power to a plurality of circuits including each load.

[0020] The emergency power supply system 100 has a gas power generation device 111. The gas power generation device 111 is a device that generates electricity using heat generated by the combustion of fuel gas, and has a generator and an engine. The gas power generation device 111 generates electricity by driving the engine by burning gas. Note that, as the gas power generation device 111, a device adopting a method of generating electricity using a turbine may be used. The gas power generation device 111 is connected to the shared section switchboard 112 and receives power supply for power generation operation through the shared section switchboard 112.

[0021] The gas power generation device 111 can supply power to the loads 201 and 202 through the shared section switchboard 112 during normal times. Also, after the gas power generation device 111 once stops operating when a power outage occurs, it can resume power generation by receiving power supply from the energy storage unit 121 described later. Thereby, it is possible to supply power to the load 202 even during an emergency. Specifically, the gas power generation device 111 starts receiving power supply from the energy storage unit 121 that has started self-operation as described later at the time when the elapsed time from the occurrence of the power outage reaches a predetermined length according to the timer included in the emergency power supply system 100, and starts power generation. The gas power generation device 111 is preset to start power generation at a timing corresponding to the operation shown in FIG. 3 described later.

[0022] The gas power generation device 111 according to this embodiment generates power by rated operation both during normal times and during emergency times. That is, the gas power generation device 111 can stably generate power with a relatively large output. Note that the gas power generation device 111 of the present invention can be switched between rated operation and other operation modes, for example, load following operation. Load following operation is an operation mode in which the output is controlled to follow the fluctuations of the load based on the detection result of an ammeter installed in the system. However, it is not assumed that the switching between rated operation and load following operation can be freely performed by the end user, and it is assumed that a technician such as a service technician performs the switching during maintenance or repair.

[0023] The emergency power supply system 100 has a power storage unit 121 and a power conditioner 122 connected through wiring 92 from the lead-in section 91 and a power supply switching device 125. The power storage unit 121 incorporates a battery such as a lead-acid battery or an alkaline battery and a power conditioner. Note that instead of the power storage unit 121, a type of power storage unit that has a battery but does not incorporate a power conditioner and an external power conditioner may be adopted. The power storage unit 121 stores power by the power supplied from the lead-in section 91 and the gas power generation device 111. Also, the power storage unit 121 supplies power stored by electricity to the loads 201 and 202 and the gas power generation device 111 through the common section switchboard 112.

[0024] The power storage unit 121 can operate by independent operation during emergency times. The power storage unit 121 performs charge and discharge with alternating current power not only during normal charge and discharge with alternating current power but also during independent operation during emergency times. Also, the power storage unit 121 can output a power greater than the rated power for a limited time during independent operation during emergency times. As an example of the power storage unit 121, Powerwall 2 manufactured by Tesla may be used.

[0025] The power conditioner 122 is connected to the solar power generation unit 123 and converts the direct current (DC) generated by the solar power generation unit 123 into alternating current (AC). The converted AC current is supplied to loads 201 and 202 and the gas power generation device 111 through the common area distribution board 112. In addition, even in an emergency, the power conditioner 122 can start generating power by receiving power from the energy storage unit 121, converting the DC current from the solar power generation unit 123 into AC current and supplying it to loads 201 and 202 and the gas power generation device 111.

[0026] The power switching device 125 is a device that monitors the power input and output of the gas power generator 111, the energy storage unit 121 and the power conditioner 122, monitors the status of power supply from the service entrance 91, and, in the event of a power outage, disconnects the connection between the power grid 90 and the emergency power supply system 100, and controls the operation mode of the energy storage unit 121 to independent operation.

[0027] The emergency power supply system 100 has voltage detection units 133 and 135 for detecting voltage. Voltage detection unit 133 is located at the entry point from the service entrance 91 to the common area. Voltage detection unit 135 is located at the entry points from the service entrance 91 to each individual house. In the event of an emergency, if a power outage occurs, the voltage drop caused by the power outage is detected by voltage detection units 133 and 135.

[0028] The emergency power supply system 100 is equipped with a switch 131 that switches the connection status between the common area distribution panel 112 and the normal load 201. Under normal circumstances, switch 131 is ON.

[0029] The switch 131 receives a signal from the voltage detection unit 133. When the voltage detection unit 133 detects a power outage as described above, it outputs a signal to the switch 131 indicating this. Upon receiving this signal, the switch 131 switches from on to off. This disconnects the load 201 from the power supply wiring in an emergency.

[0030] As described below, the emergency power supply system 1 has a configuration that allows it to supply power not only to the loads in the common areas but also to the loads in the private areas during an emergency. The common area electrical panel 112 is connected to the wiring 92 of each individual private dwelling A to C through a switch 132 and a harmonic reduction unit 140 described later. The switch 132 is a component that switches the power supply from the equipment on the common area side through the common area electrical panel 112 on and off. Normally, the switch 132 is off.

[0031] The voltage detection unit 133 inputs a signal to the switch 132. As described above, the voltage detection unit 133 detects the occurrence of a power outage and outputs a signal to the switch 132 indicating this. The switch 132 is linked to a timer in the emergency power supply system 100, and according to this timer, it switches from off to on when the elapsed time since the input of the signal indicating the occurrence of a power outage reaches a predetermined length.

[0032] Each individual house is equipped with a switch 134. Switch 134 is connected to the wiring 92 from the service entrance 91 and is also connected to the common area electrical panel 112 via switch 132 and the harmonic reduction unit 140. Switch 134 can selectively switch between a normal state, where the service entrance 91 is connected to loads 301 and 302, and an emergency state, where the harmonic reduction unit 140 is connected to load 302.

[0033] A signal from the voltage detection unit 135 is input to switch 134. As described above, the voltage detection unit 135 detects the occurrence of a power outage and outputs a signal to switch 134 indicating this. Switch 134 has a built-in timer, and according to this timer, when the elapsed time since the input of the signal indicating the occurrence of a power outage reaches a predetermined length, it switches from the normal state to the emergency state. As a result, in an emergency, load 301 is disconnected from the power supply wiring, while load 302 is connected to the power supply wiring 92 on the common area side through switch 134, harmonic reduction unit 140, switch 132, and common area distribution board 112.

[0034] Switches 131, 132, and 134 are pre-configured to switch states in accordance with the operation described later in Figure 3 when a power outage occurs.

[0035] The harmonic reduction unit 140 is a circuit or device that reduces the harmonic currents generated when the loads 302 installed in private areas A to C operate in an emergency. Loads that can generate harmonic currents include household electrical appliances, such as water heaters and heating systems. The harmonic reduction unit 140 according to this embodiment consists of a harmonic reactor. In place of or in addition to the harmonic reactor, other means for reducing harmonic currents, such as DC reactors or active filters, may be installed at appropriate locations.

[0036] The operation of the emergency power supply system 100 will be explained below with reference to Figure 3. When a power outage occurs (S1), the energy storage unit 121 starts independent operation according to the function of the power switching device 125 (S2). At this time, the energy storage unit 121 temporarily provides an output higher than its rated value in order to cover the temporary increase in power supply in S3 to S7.

[0037] Next, when switch 131 is switched from off to on, power supply from the energy storage unit 121 to the emergency load 202 via the common area distribution board 112 and switch 131 begins (S3).

[0038] Next, as switch 132 switches from off to on, and switch 134 in private unit A switches from normal state to emergency state, power supply from the energy storage unit 121 to the load 302 in private unit A via the common area electrical panel 112, switch 132, harmonic reduction unit 140, and switch 134 begins (S4).

[0039] Next, after a predetermined time interval following the execution of S4, the switch 134 in the private unit B switches from the normal state to the emergency state, and power supply from the energy storage unit 121 to the load 302 of the private unit B via the common area power panel 112, switch 132, harmonic reduction unit 140, and switch 134 begins (S5).

[0040] Next, after a predetermined time interval following the execution of S5, the switch 134 in the private unit C switches from the normal state to the emergency state, and power supply from the energy storage unit 121 to the load 302 of the private unit C via the common area power panel 112, switch 132, harmonic reduction unit 140, and switch 134 begins (S6).

[0041] Thus, the switch 134 is set to switch states in a staggered manner, in the order of occupied area A → occupied area B → occupied area C. As a result, power supply is gradually initiated in the order of load 302 in occupied area A → load 302 in occupied area B → load 302 in occupied area C. This staggered operation is intended to distribute the temporarily increased loads that are the target of power supply, thereby facilitating the smooth power supply by the energy storage unit 121.

[0042] Next, the gas power generator 111 and the power conditioner 122 restart operation, thereby initiating the supply of power from the gas power generator 111 and the power conditioner 122 to the emergency loads 202 and 302 (S7). At this time, if the power generated by the rated operation of the gas power generator 111 and the power supplied by the power conditioner 122 exceed the demand at loads 202 and 302, the excess is used to store energy in the energy storage unit 121. Although the start of power supply from the gas power generator 111 in S7 occurs after the execution of S6, the preparatory operations for starting power generation by the gas power generator 111 may be started before S6. In this case, the preparatory operations are executed in parallel with S6. Therefore, the power supply from the gas power generator 111 in S7 is started quickly.

[0043] According to the emergency power supply system 100 described above, for example, if the load 302 generates harmonic currents, these harmonic currents are reduced by the harmonic reduction unit 140. Therefore, the increase in reactive power due to harmonic currents is suppressed. This makes it easier to ensure a load size that can be supplied with power during an emergency.

[0044] Furthermore, in this embodiment, the gas power generator 111 and the energy storage unit 121 supply power to the emergency loads 202 and 302. In this case, if the harmonic currents generated by load 302 were left as they were, it would be necessary to suppress the output of the gas power generator 111 and the energy storage unit 121 to some extent to avoid exceeding the system's allowable output, considering the increase in reactive power due to the harmonic currents. However, suppressing these outputs may prevent sufficient power supply to loads 202 and 302. In contrast, in the present invention, the harmonic currents are reduced by the harmonic reduction unit 140. Therefore, the need to suppress the output of the gas power generator 111 and the energy storage unit 121 is reduced. Thus, it is easier to ensure sufficient power supply by these devices.

[0045] Furthermore, in this embodiment, prior to the start of power supply from the gas power generator 111 in S7 of Figure 3, power supply from the energy storage unit 121 to the common areas and individual residences A to C in S3 to S6 is started relatively quickly. At this time, since the harmonic current is reduced by the harmonic reduction unit 140, the need to suppress the output of the energy storage unit 121 is reduced. Therefore, it is easier to secure sufficient power supply with the output of the energy storage unit 121 alone. Thus, it is possible to supply power from the energy storage unit 121 prior to the power supply from the gas power generator 111.

[0046] In particular, this embodiment employs a power storage unit 121 that can temporarily output power exceeding the rated output in an emergency. In a normal battery, it is not possible to output power exceeding the rated output during independent operation, and power supply is immediately stopped when an excessive load occurs. In contrast, in this embodiment, which uses a power storage unit 121 that can temporarily output power exceeding the rated output, it is possible to appropriately supplement the supplied power at a time when a power shortage is likely to occur before the gas power generator 111 starts generating power. On the other hand, if reactive power increases due to harmonic currents in addition to such output exceeding the rated output, there is a high risk that the output of the battery unit 121 will exceed the allowable output of the entire system. In contrast, in this embodiment, the harmonic current is reduced by the harmonic reduction unit 140, which reduces the above risk. Therefore, it is easier for the battery unit 121 to output the above-mentioned output exceeding the rated output.

[0047] Furthermore, in this embodiment, multiple individual residences are divided and managed into three groups, A to C (corresponding to the case where n=3 in the "first to nth groups" of the present invention). In the event of an emergency, power supply from the energy storage unit 121 is initiated to all individual residences included in each of the A to C groups, in the order of A → B → C, with time intervals between them (S4 to S6 in Figure 3). Therefore, compared to, for example, the case where power supply is started to all individual residences simultaneously, it is possible to avoid a situation where an excessive load occurs all at once. Consequently, the output of the energy storage unit 121 is less likely to be insufficient to cover the power consumption by the load. On the other hand, if reactive power increases due to harmonic currents, in order to cover the power consumption by the load with the output of the energy storage unit 121, it becomes necessary to increase the number of divisions into groups and reduce the size of the load per group. In such a case, as the number of groups increases, there is a risk that power supply to groups that are scheduled to receive power later will be delayed. In contrast, in this embodiment, the harmonic reduction unit 140 reduces the risk of increased reactive power due to harmonic currents. Therefore, there is no need to increase the number of divisions into groups. Consequently, it is not necessary to set a large number of divisions into groups, which can cause delays in power supply.

[0048] Furthermore, from the perspective of not delaying the start of power supply to individual homes, it is preferable to have a small number of groups, as long as the power supply from the energy storage unit 121 can cover the needs. For example, the number of groups may be two. Alternatively, a configuration may be adopted in which power supply from the energy storage unit 121 is started simultaneously for all individual homes without dividing them into groups.

[0049] Furthermore, in this embodiment, the harmonic reduction unit 140 is composed of a harmonic reactor. This makes it possible to achieve harmonic reduction with a simple configuration.

[0050] Furthermore, this embodiment includes a power storage unit 121 that can store energy using alternating current during emergencies. Normally, in power supply systems that use fuel power generation devices such as gas power generators 111 as emergency power sources, batteries that cannot store energy using alternating current are used during independent operation. In contrast, in this embodiment, which uses a power storage unit 121 that can store energy using alternating current, surplus power generated can be used to store energy in the power storage unit 121 during emergencies. Therefore, the risk of the system becoming unstable or stopping due to excessive power supply to the load is reduced. This makes it possible to operate the gas power generator 111 at its rated capacity. During emergencies, the gas power generator 111 operates at its rated capacity, enabling more efficient power supply compared to conventional systems that employ load-following operation.

[0051] Furthermore, as described above, if it is not assumed that the operating mode of the gas power generator 111 can be freely switched by the end user, the normal operating mode and the emergency operating mode must be basically the same. Therefore, if rated operation is performed during an emergency as in this embodiment, rated operation will also be performed during normal times. Thus, the power generated by the gas power generator 111 can be effectively utilized even during normal times.

[0052] [Second Embodiment] An emergency power supply system 200 according to a second embodiment of the present invention will be described with reference to Figure 4. As shown in Figure 4, the emergency power supply system 200 according to this embodiment is a system installed in a multi-unit dwelling such as an apartment building having common areas and private areas A to C, and includes many components in common with the emergency power supply system 100 described above. For this reason, the following description will mainly focus on the components of the emergency power supply system 200 that differ from the emergency power supply system 100, and the description of the common components will be omitted as appropriate.

[0053] In the emergency power supply system 100 according to the above embodiment, the common area electrical panel 112 is connected to the circuits of the private areas A to C via a set of switches 132 and a harmonic reduction unit 140. In contrast, in the emergency power supply system 200 according to this embodiment, the common area electrical panel 112 is connected to the circuits of each of the private areas A to C via a set of switches 132 and a harmonic reduction unit 140 installed for each of the private areas A to C. Each switch 132 is equipped with one timer 201. The timer 201 is connected to a voltage detection unit 133. When a power outage detection signal is input from the voltage detection unit 133, the timer 201 outputs a signal to the switch 132 indicating that a power outage has occurred when the elapsed time since the input of the signal indicating the occurrence of a power outage reaches a predetermined length. When a signal is input from the timer 201, the switch 132 switches from the normal state to the emergency state. On the other hand, the timers 134 installed in private units A to C do not have built-in timers, and immediately switch from the normal state to the emergency state when a power outage detection signal is input from the voltage detection unit 135. The other configurations in the private and common areas are the same as in the embodiment described above.

[0054] In the event of a power outage, the process of supplying power from the emergency power supply system 200 to the loads in the common areas and private areas is as shown in Figure 3. However, when power supply from the energy storage unit 121 to private areas A to C is started sequentially in S4 to S6, the state of switch 132 switches sequentially at appropriate intervals, so that power supply is started in stages in the order of load 302 in private area A → load 302 in private area B → load 302 in private area C.

[0055] According to this embodiment, in addition to the effects of the first embodiment, it is not necessary to install a timer-equipped switch 134 in each individual dwelling, thus simplifying and reducing the cost of equipment in individual dwellings. Furthermore, the switch 132 can be installed outside the individual dwelling, for example, attached to the common area electrical panel 112. With this configuration, it is easy to arbitrarily set the number of groups of private units and the number of individual dwelling units within each group during the system design phase.

[0056] (modified version) The above describes preferred embodiments of the present invention, but the present invention is limited to the above embodiments. It is not limited to a wide range of methods, as long as they are described as means to solve the problem. It is possible to make such changes. Below, we will describe modifications according to the above embodiment.

[0057] In the above-described embodiment, a gas power generator 111 is used as the fuel power generator. However, power generators using other fuels such as petroleum or hydrogen gas, or fuel cells, may also be used. Furthermore, a solar power generation unit 123 may not be provided.

[0058] Furthermore, in the above-described embodiment, power supply from the energy storage unit 121, etc., is started for all of the private areas A to C before power generation by the gas power generator 111 begins. Alternatively, power supply from the energy storage unit 121, etc., may be started for any part of the private areas A to C before power generation by the gas power generator 111 begins.

[0059] Furthermore, the above-described embodiment relates to an emergency power supply system 100 installed in an apartment building. In this regard, the present invention may also be applied to other facilities such as tenant buildings and commercial facilities where power supply systems for normal power supply are individually provided in each area. [Explanation of Symbols]

[0060] A-C Private Areas 90 Power system 91 Inlet 100 Emergency power supply systems 111 Gas power generator 121 Energy Storage Unit 133, 135 Voltage detection unit 131, 132, 134 switches 140 Harmonic Reduction Section 201, 301 Regular load 202, 302 Emergency load

Claims

1. An emergency power supply system electrically connected to the power grid that normally supplies power to the facility, An emergency power supply device comprising a fuel power generation device capable of supplying electricity to a facility by generating electricity using fuel, and a storage battery capable of supplying electricity to a facility and also capable of storing electricity by receiving an electric current, and capable of supplying electricity to a facility including multiple houses in an emergency, Wiring that supplies power from the emergency power supply device to household electrical appliances in a facility that normally receive power from the aforementioned power grid during an emergency, The household electrical appliance comprises a harmonic reduction means connected to the wiring for reducing harmonic currents generated in the household electrical appliance, The aforementioned multiple houses are divided into groups from the 1st to the nth (n: a natural number greater than or equal to 2), In an emergency, the supply of power from the storage battery to all houses included in group k is initiated in the order k = 1, 2, ..., n, with time intervals between them, and then the fuel generator is started to generate power. An emergency power supply system characterized in that the harmonic reduction means is installed to mitigate the increase in the number n of the group.

2. The emergency power supply system according to claim 1, characterized in that the storage battery temporarily outputs power exceeding its rated value before the fuel power generation device starts generating power.

3. The emergency power supply system according to claim 1, characterized in that the harmonic reduction means is a harmonic reactor.

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