JPH07274398A - Harmonic wave suppressing system - Google Patents

Abstract

PURPOSE:To provide a harmonic wave suppressing system in which energy conservation of the entire system is obtained when a UPS, an active filter, a dispersed power source, etc., are used by stopping a harmonic suppressor provided at an electronic apparatus side as required. CONSTITUTION:When power is supplied from an inverter 12 of a power source 11 to electronic apparatuses 20-1, 20-2,... of a load side in a system using a UPS of a continuous inverter power supply type, its state is detected by a connection detector 80, and a signal generator outputs a control signal. Receivers 60-1, 60-2,... receive the control signal at the load side thereby to stop operations of inner harmonic suppressors 40-1, 40-2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a harmonic suppression system used in a system having a plurality of electronic devices, and more particularly to a system using an uninterruptible power supply (hereinafter referred to as UPS) and an active filter. The present invention relates to a harmonic suppression system suitable for use in suppressing harmonics in a system using the power supply or a system using a distributed power source.

[0002]

2. Description of the Related Art In general, inside electronic equipment, a harmonic suppression circuit is provided on the input side for receiving a commercial power supply in order to suppress the harmonic current of the power supply. When this harmonic suppression circuit is realized by the active smoothing filter method (ASF), the efficiency is about 90%. Therefore, ASF
By providing the harmonic suppression circuit of No. 2, the power loss increases and the power saving is impaired.

By the way, a system is constructed by combining several kinds of electronic devices or combining a plurality of electronic devices. For example, it is possible to combine peripherals and terminal devices around a computer. In the case of a system having such a plurality of electronic devices, UPS is provided at the commercial power receiving end of the system as a power failure countermeasure.

(1) UPS UPS has (a) a regular inverter power supply system and (i)
There is a regular commercial power supply system UPS.

(A) Regular Inverter Power Supply System The regular inverter power supply system UPS receives commercial power, converts it into direct current, converts it into alternating current with an inverter, and supplies power to electronic equipment.
In this case, in order to prevent the harmonic current generated in the UPS from flowing back to the commercial power source side, a harmonic current suppressing circuit is provided on the input side of the UPS. When a power failure occurs, in the regular inverter power feeding method, power is supplied from the battery on the inverter input side and continuously output.

(Ii) Regular commercial power supply system The regular commercial power supply system UPS supplies commercial alternating current power to the load electronic device as it is during normal operation through a route of commercial power reception → switching circuit → electronic device. For this reason, it is necessary to provide a harmonic suppression circuit on the electronic device side that is the load of the UPS. Further, although the UPS has a built-in storage battery charging circuit, its output capacity is sufficiently smaller than the AC output capacity of the UPS, and in general, the UPS does not have a harmonic suppression circuit. If the input current of the electronic device on the load side suppresses harmonics, the input current of the UPS can satisfy the harmonic regulation limit. When a power failure occurs, the constant commercial power supply system
The output circuit is switched to the inverter side, and AC is continuously supplied from the storage battery to the load electronic device via the inverter.

(2) Active Filter There is also a method in which harmonic countermeasures are collectively performed on the input side of the system without using individual electronic equipment. An example of such a case is one using an active filter.

The active filter is connected to a commercial input line of the system and is generated from the electronic device by injecting into the power supply input line of the system a harmonic current component having a phase opposite to that of the harmonic current component flowing in the electronic device of the load. It cancels out the higher harmonic components. By injecting the opposite phase harmonic component by this active filter, the combined harmonic current supplied to the commercial power supply line is reduced. In this method, since the active filter collectively suppresses harmonics, it is not necessary to take measures against harmonics in individual electronic devices. However, if harmonic measures are taken on the load side, the operating capacity of the active filter can be correspondingly reduced.

(3) Distributed power source There is also a system in which a power source of a power generator is used separately from a commercial power source. This is a method in which a customer has a power generation device including a combination of a solar cell and an inverter, and injects surplus power generated by this power generation device into a power system.
The purpose is to improve equipment efficiency and energy efficiency in the customer. This reverse flow of electric power is called reverse flow. In this case, since a reverse power flow occurs, it is necessary to provide a harmonic wave suppression circuit at the output end of the power generator of the customer.

[0010]

[Problems to be Solved by the Invention]

(1) Systems using UPS In the future, it will be required to take measures against harmonics in various electronic devices. When taking measures against harmonics in a system using UPS, the following problems occur.

(A) System using UPS of constant inverter power supply system In such a system, since the harmonic suppression circuit is provided at two places of the UPS and each electronic device, power is taken at these two places as a harmonic suppression measure. Receive. Therefore, a loss occurs in each harmonic suppression circuit, and the amount of the loss is larger than that in the case where there is a harmonic suppression circuit in one place, which is the ratio of the net electric power used by the electronic device to the electric power received by the system. Efficiency is reduced.

When a power failure occurs on the commercial power source side,
UPS draws electric power from a storage battery, converts it into an AC voltage with an inverter, and supplies electric power to electronic equipment. In this case, there is no exchange of electric power with the commercial power supply side,
No harmonic measures are required. However, since a harmonic suppression circuit (ASF) is provided in each electronic device, power loss occurs due to the harmonic suppression circuit on the load side, and the energy of the battery is wasted by the loss. Become. Therefore, at the time of power failure, it is desirable to stop the operation of the harmonic suppression circuit in order to reduce battery consumption.

Even in the constant inverter power feeding system, a bypass switch may be provided as a measure against maintenance / inspection / fault on the inverter side, and power may be directly fed from a commercial power source to electronic equipment as a load. When operating in the commercial direct connection type as described above, the UPS of the continuous commercial power supply system described below is used.
Same situation as.

(I) System using UPS of continuous commercial power supply In contrast, in UPS of the continuous commercial power supply system, the commercial power supply and the electronic device of the load are directly connected while the commercial power supply is used. Therefore, the harmonic current generated from the electronic device flows back to the commercial power line as it is. In order to reduce the amount of this backflow below the specified limit value, electronic equipment must be provided with a harmonic suppression circuit. However, when the commercial power source loses power, the harmonics do not flow back to the commercial power source side, so that harmonic suppression measures on the load side are unnecessary. For this reason, at the time of a power failure of the commercial power source, as in the case of the constant inverter power feeding system, power loss occurs due to the harmonic suppression circuit on the load side, and the storage battery is quickly consumed. Therefore, it is desirable to stop the operation of the harmonic suppression circuit on the load side during a power failure.

As a method for preventing the waste of these energy, when the commercial power receiving end of the system is provided with a harmonic countermeasure, an electronic device as a load that does not suppress the harmonic may be used. However, there arises a problem that an electronic device maker has to provide two types of products, that is, a countermeasure product and a non-measurement product. In addition, since the user cannot divert an untreated electronic device to another, operational flexibility is lost.

In this way, when the electronic device for which countermeasures have been taken is combined with the UPS of the constant inverter type, it is against energy saving. Further, when the commercial power supply fails, there is a problem that energy is wasted if the electronic device has a countermeasure circuit.

(2) System using active filter When an active filter is provided on the input side of the system and a harmonic suppression measure is collectively performed, measures for individual electronic devices are double investment. In this case, if the harmonic suppression circuit of the electronic device on the load side is also operated, the efficiency of the entire system decreases. Therefore, it is desirable to stop the harmonic suppression function on the load side.

(3) System using distributed power source When electronic equipment is system-configured by a customer,
When the total capacity of the operating electronic devices is smaller than the power generated by the inverter at that time, the harmonic current generated by the electronic devices is small in the total inverter output current, so Does not matter. Therefore, also in this case, the harmonics countermeasure on the inverter side and the countermeasure on the load side are double investments. As a result, when viewed from the power system side, the harmonic current at the customer's entrance is reduced more than necessary relative to the regulation value, and power loss due to the harmonic countermeasure circuit occurs on both the power supply side and the load side. Reduce the efficiency of the system. Also, in such a system U
Even when PS is introduced, the efficiency of the system is reduced as described above.

The present invention has been made in view of the above points, and uses a UPS, an active filter, a distributed power source, etc. by stopping the harmonic suppression circuit provided on the electronic equipment side as necessary. An object of the present invention is to provide a harmonic wave suppression system that saves energy in the entire system in such a case.

[0020]

[Means for Solving the Problems]

(1) The harmonic suppression system of the present invention outputs a control signal when power is supplied from the inverter circuit on the power supply side to the equipment on the load side in a system using UPS of the constant inverter power supply system. Then, the operation of the harmonic suppression circuit in the equipment is stopped.

(2) The harmonic suppression system of the present invention is a system using UPS of the constant inverter power feeding system, which is provided with a power failure detection circuit for detecting a power failure state of the commercial power source, and which is provided from the inverter circuit provided on the power source side. When power is being supplied to a device that is a load, the operation of the harmonic suppression circuit in the device can be stopped by detecting the power failure state of the commercial power supply and outputting a control signal. Characterize.

(3) The harmonic suppression system of the present invention is a system that uses UPS of the constant inverter power supply system, and discharge detection for detecting that an energy supply circuit such as a storage battery provided on the power supply side is in a discharged state. A circuit is provided to suppress harmonics in the equipment by detecting the discharge state of the energy supply circuit and outputting a control signal when power is supplied from the inverter circuit on the power supply side to the equipment on the load side. The feature is that the operation of the circuit is stopped.

(4) The harmonic suppression system of the present invention is a system that uses UPS of the constant commercial power supply system, and controls when power is supplied from the inverter circuit on the power supply side to the equipment on the load side. The feature is that a signal is output to stop the operation of the harmonic suppression circuit in the device.

(5) The harmonic suppression system of the present invention is a system using UPS of the constant commercial power supply system, and discharge detection for detecting that the energy supply circuit such as a storage battery provided on the power supply side is in a discharging state. A circuit is provided to suppress harmonics in the equipment by detecting the discharge state of the energy supply circuit and outputting a control signal when power is supplied from the inverter circuit on the power supply side to the equipment on the load side. The feature is that the operation of the circuit is stopped.

(6) In the harmonic suppression system of the present invention, in the system using the active filter, when the active filter on the power supply side is operating, the harmonic suppression circuit in the equipment on the load side is controlled by the control signal. The feature is that the operation is stopped.

(7) The harmonic suppression system of the present invention is a system using an active filter and a distributed power supply, and when the active filter on the power supply side is operating, the harmonics in the equipment on the load side are controlled by a control signal. It is characterized in that the operation of the harmonic suppression circuit in the distributed power supply device is stopped together with the operation of the suppression circuit.

(8) The harmonic suppression system of the present invention is a system using an active filter and a distributed power supply, detects the level of a harmonic component on the power supply side, and when the level exceeds a predetermined value, a load is applied. A control means for outputting a control signal for stopping the harmonic suppression function on the side,
It is characterized in that, when the active filter on the power supply side is operating, the operation of the harmonic suppression circuit in the device on the load side is stopped by a control signal according to the level of the harmonic component.

(9) The harmonic suppression system according to the present invention is a system using an active filter and a distributed power supply, and when the active filter on the power supply side is operating, it is controlled by a control signal according to the level of the harmonic component. It is characterized in that the operation of the harmonic suppression circuit in the device on the load side is stopped together with the operation of the harmonic suppression circuit in the distributed power supply device.

(10) The harmonic suppression system of the present invention is
By providing the load side device with a frequency judgment circuit that judges the frequency of the input power supply, if the frequency of the input power supply to the device is a frequency unique to the power supply, stop the operation of the harmonic suppression circuit through the frequency judgment circuit. It is characterized by doing so.

(11) The harmonic suppression system of the present invention is
By providing a frequency judgment circuit that judges the frequency of the input power supply on the load side device, the harmonic suppression circuit can be operated through the frequency judgment circuit when the frequency of the input power supply to the device is the frequency of the commercial power supply. It is characterized by

(12) The harmonic suppression system of the present invention is
By providing the load side device with a voltage judgment circuit that judges the voltage value of the input power supply, the harmonic suppression circuit operates through the voltage judgment circuit when the voltage value of the input power supply to the device is a voltage value specific to the power supply device. It is characterized by trying to stop.

(13) The harmonic suppression system of the present invention is
By providing the load side device with a voltage judgment circuit that judges the voltage value of the input power supply, the harmonic suppression circuit operates through the voltage judgment circuit when the voltage value of the input power supply to the device is the voltage value of the commercial power supply. It is characterized by doing so.

(14) The harmonic suppression system of the present invention is
By providing the load side device with a waveform judgment circuit that judges the voltage waveform of the input power supply, when the voltage waveform of the input power supply to the device is a voltage waveform unique to the power supply device, the harmonic suppression circuit operates through the waveform judgment circuit. It is characterized by trying to stop.

(15) The harmonic suppression system of the present invention is
By providing the load side device with a waveform judgment circuit that judges the voltage waveform of the input power supply, if the voltage waveform of the input power supply to the device is the voltage waveform of the commercial power supply, operate the harmonic suppression circuit through the waveform judgment circuit. It is characterized by doing so.

(16) The harmonic suppression system of the present invention is
By equipping the load side equipment with a jitter detection circuit that detects the jitter included in the frequency of the input power supply, when the frequency of the input power supply to the equipment includes the jitter specific to the power supply device, the harmonics are detected through the jitter detection circuit. The feature is that the operation of the suppression circuit is stopped.

(17) The harmonic suppression system of the present invention is
By providing the load side device with a jitter detection circuit that detects the jitter included in the frequency of the input power supply, when the frequency of the input power supply to the device does not include jitter,
It is characterized in that the harmonic suppression circuit is operated through the waveform determination circuit.

[0037]

According to the above configurations (1) to (5), in the system using the UPS of the constant inverter power feeding system or the constant commercial power feeding system, the power is supplied from the power source side inverter circuit to the load side device. If so, a control signal for stopping the operation of the harmonic suppression circuit in the device is output. As a result, the harmonic suppression operation on the load side can be stopped.

According to the above configurations (6) to (9), in the system using the active filter, the operation of the harmonic suppression circuit in the device is stopped when the active filter on the power supply side is operating. A control signal for outputting is output. As a result, the harmonic suppression operation on the load side can be stopped. Further, in a system that also uses a distributed power supply, a control signal for stopping the operation of the harmonic suppression circuit in the distributed power supply device is output. This allows
It is possible to stop the harmonic suppressing operation on the load side and the harmonic suppressing operation on the distributed power source side.

According to the above configurations (10) to (17),
Based on the frequency, voltage value, voltage waveform, or jitter of the input power supply to the device, the power supply device or the commercial power supply is determined as the input power supply, and the harmonic suppression operation in the device is controlled according to the result. As a result, efficient power supply can be performed without requiring a special control line for function control.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A harmonic suppression system according to an embodiment of the present invention will be described below with reference to the drawings. Here, a system using UPS of the constant inverter power supply system (first to third embodiments), a system using UPS of the constant commercial power supply system (fourth and fifth embodiments), active filter and distributed power source A system using the above (sixth and seventh embodiments) and a system for controlling the harmonic suppression function on the load side without using a signal line (eighth to eleventh embodiments) will be described.

(First Embodiment) First, a first embodiment of the present invention will be described with reference to FIG. Here, in the system using the UPS of the constant inverter feeding method, the harmonic suppressing function on the load side is controlled.

FIG. 1 is a block diagram showing the configuration of a system using UPS of the constant inverter power supply system according to the first embodiment. The present system includes a power supply device 1 that receives a commercial power supply AC that is an energy source of the system and supplies AC power to a load, and a plurality of electronic devices 20-1 that operate by receiving the power supply supplied by the power supply device 1. It consists of 20-2.

The power supply device 1 has a harmonic suppression circuit 30, a conversion circuit 11, a storage battery 100, an inverter circuit 12, a bypass line 13, and a switching circuit 70. The harmonic suppression circuit 30 reduces the harmonic component of the input current. Conversion circuit 1
1 produces a DC voltage from the commercial power supply AC from which the harmonic components are cut by the harmonic suppression circuit 30. Storage battery 100
Is an energy supply circuit for supplying voltage by the power supply device 1 itself when the commercial power supply AC fails. The inverter circuit 12 receives the DC voltage obtained by the conversion circuit 11 or the DC voltage of the storage battery 100, and receives, for example, 50 Hz, 5
An alternating voltage of 5 Hz, 60 Hz, etc. is created. Bypass line 13
Are provided in parallel with the inverter circuit 12 and are connected to the commercial power source A.
Supply C to the load as it is. The switching circuit 70 selects either the output of the inverter circuit 12 or the output of the bypass line 13.

The electronic devices 20-1, 20-2, ... Operate by receiving the output of either the inverter circuit 12 or the bypass line 13 selected by the switching circuit 70.
Further, inside the electronic devices 20-1, 20-2, ..., a harmonic suppression circuit 40- for suppressing a harmonic component, respectively.
1, 40-2 ... Are provided.

Here, in the first embodiment, the power supply device 1 is provided with the connection detection circuit 80 and the signal generation circuit 50. The connection detection circuit 80 is a switching circuit 70.
Detects that the output of the inverter circuit 12 or the output of the bypass line 13 is selected. Signal generation circuit 50
Outputs a control signal 51 for stopping the harmonic suppression function on the load side when the switching circuit 70 selects the output of the inverter circuit 12 based on the detection result of the connection detection circuit 80.

The electronic devices 20-1, 20-2, ... Receive this control signal 51 and receive the harmonic suppression circuit 40-.
Reception circuit 60 for stopping the operation of 1, 40-2.
-1, 60-2 ... Are provided.

Next, the operation of the first embodiment will be described. In the case of a system using UPS of the constant inverter power supply system, the commercial power supply AC is usually converted into a predetermined AC voltage and supplied to the load by the inverter operation. That is, in FIG. 1, the output of the inverter circuit 12 is selected by the switching circuit 70, and the electronic devices 20-1, 20-2, ... On the load side operate using the output of the inverter circuit 12 as an input power source. .

Here, the power supply device 1 is provided with the harmonic suppression circuit 30, and the power is always supplied to the load via the harmonic suppression circuit 30 during the operation of the inverter. On the other hand, the electronic devices 20-1 and 20-2 on the load side
.. are also provided with harmonic suppression circuits 40-1, 40-2 ..., and loss will occur if harmonic suppression is performed by both.

In the first embodiment, the switching circuit 70
When the output of the inverter circuit 12 is selected, the state is detected by the connection detection circuit 80 and the signal generation circuit 50 is detected.
Outputs a control signal 51 to the load. By the output of the control signal 51, the electronic devices 20-1, 20-2 ...
Then, the operation of the harmonic suppression circuits 40-1 and 40-2 inside the device is stopped through the reception circuits 60-1 and 60-2.

On the other hand, there is a case where the UPS of the constant power supply type is directly operated by the commercial power source AC. This allows the switching circuit 70 in the power supply device 1 to bypass the bypass line 13.
It is done by switching to. In this case, the electronic devices 20-1, 20-2, ... Operate by directly receiving the commercial power supply AC. As described above, when the bypass line 13 is used for the commercial direct connection mode, the commercial power supply AC does not pass through the harmonic suppression circuit 30 in the power supply device 1.
It is necessary to suppress harmonics on the load side.

In the first embodiment, the switching circuit 70
When the output of the bypass line 13 is selected, the state is detected by the detection circuit 80, and the output of the signal generation circuit 50 is prohibited. Thereby, the electronic devices 20-1 and 20-2
Can suppress harmonics through the internal harmonic suppression circuits 40-1 and 40-2.

As described above, the U of the continuous inverter feeding system is used.
In the system using PS, when the inverter output is supplied to the load as the input power source in the normal mode,
By stopping the harmonic suppression function on the load side, power loss on the load side can be prevented and power can be efficiently supplied.

(Second Embodiment) Next, a second embodiment of the present invention will be described. Here, in the system using the UPS of the constant inverter power supply system, the harmonic suppression function on the load side is controlled especially when power is supplied from the battery.

FIG. 2 is a block diagram showing the configuration of a system using UPS of the constant inverter feeding system according to the second embodiment. In FIG. 2, the same parts as those in FIG. The present system includes a power supply device 1 that receives a commercial power supply AC that is an energy source of the system and supplies AC power to a load, and a plurality of electronic devices 20-1 that operate by receiving the power supply supplied by the power supply device 1. Two
It consists of 0-2.

The power supply device 1 has a harmonic suppression circuit 30, a conversion circuit 11, a storage battery 100, an inverter circuit 12, a bypass line 13, and a switching circuit 70. The harmonic suppression circuit 30 reduces the harmonic component of the input current. Conversion circuit 1
1 produces a DC voltage from the commercial power supply AC from which the harmonic components are cut by the harmonic suppression circuit 30. Storage battery 100
Is an energy supply circuit for supplying voltage by the power supply device 1 itself when the commercial power supply AC fails. The inverter circuit 12 receives the DC voltage obtained by the conversion circuit 11 or the DC voltage of the storage battery 100, and receives, for example, 50 Hz, 5
An alternating voltage of 5 Hz, 60 Hz, etc. is created. Bypass line 13
Are provided in parallel with the inverter circuit 12 and are connected to the commercial power source A.
Supply C to the load as it is. The switching circuit 70 selects either the output of the inverter circuit 12 or the output of the bypass line 13.

The electronic devices 20-1, 20-2, ... Operate by receiving the output of either the inverter circuit 12 or the bypass line 13 selected by the switching circuit 70.
Further, inside the electronic devices 20-1, 20-2, ..., a harmonic suppression circuit 40- for suppressing a harmonic component, respectively.
1, 40-2 ... Are provided.

Here, in the second embodiment, the power supply device 1 is provided with a power failure detection circuit 110, an AND circuit 56 and a signal generation circuit 50. Power failure detection circuit 110
Detects a power failure state of the commercial power supply AC and outputs the power failure detection signal to the AND circuit 56. The AND circuit 56 takes the logical product of the output of the inverter circuit 12 and the output of the power failure detection circuit 110, and outputs the power failure detection signal output from the power failure detection circuit 110 when the output of the inverter circuit 12 is normal. Give to fifty. The signal generation circuit 50 is
According to the output signal of the AND circuit 56, the inverter circuit 1
When the output of 2 is normal and the switching circuit 70 selects the output of the inverter circuit 12 for the power failure detection signal output from the power failure detection circuit 110, control for stopping the harmonic suppression function on the load side The signal 51 is output.

Further, the electronic equipment 20-1, 20-2 ... Receives the control signal 51 and receives the harmonic suppression circuit 40-.
Reception circuit 60 for stopping the operation of 1, 40-2.
-1, 60-2 ... Are provided.

Next, the operation of the second embodiment will be described. In the case of a system using UPS of the constant inverter power supply system, the commercial power supply AC is usually converted into a predetermined AC voltage and supplied to the load by the inverter operation. That is, in FIG. 2, the output of the inverter circuit 12 is selected by the switching circuit 70, and the electronic devices 20-1, 20-2, ... On the load side operate using the output of the inverter circuit 12 as an input power source. .

Here, if a commercial power supply AC fails,
The power supply device 1 continues to supply power to the electronic devices 20-1, 20-2 ... Using the voltage stored in the storage battery 100. In this case, the voltage energy of the storage battery 100 is limited, and if the harmonic suppression function works on the load side,
The storage battery 100 is wastefully used due to power loss.

In the second embodiment, the power failure detection circuit 11
When the power failure state of the commercial power supply AC is detected by 0,
When power is normally supplied from the inverter circuit 12, the signal generation circuit 50 outputs the control signal 51 to the load. By the output of the control signal 51, the receiving circuits 60-1, 6 of the electronic devices 20-1, 20-2, ...
0-2 through the harmonic suppression circuits 40-1, 4 inside the device
The operation of 0-2 is stopped.

As described above, the U of the constant inverter power feeding system is used.
In the system using PS, when the battery is used to supply power, the harmonic suppression function on the load side is in a stopped state. As a result, it is possible to reduce battery consumption at the time of power failure and efficiently supply power.

(Third Embodiment) Next, a third embodiment of the present invention will be described. Here, in the system using the UPS of the constant inverter power feeding system, the harmonic suppression function on the load side is controlled by detecting the discharge current of the battery in particular.

FIG. 3 is a block diagram showing the configuration of a system using UPS of the constant inverter feeding system according to the third embodiment. Note that, in FIG. 3, the same parts as those in FIG. The present system includes a power supply device 1 that receives a commercial power supply AC that is an energy source of the system and supplies AC power to a load, and a plurality of electronic devices 20-1 that operate by receiving the power supply supplied by the power supply device 1. Two
It consists of 0-2.

The power supply device 1 has a harmonic suppression circuit 30, a conversion circuit 11, a storage battery 100, an inverter circuit 12, a bypass line 13, and a switching circuit 70. The harmonic suppression circuit 30 reduces the harmonic component of the input current. Conversion circuit 1
1 produces a DC voltage from the commercial power supply AC from which the harmonic components are cut by the harmonic suppression circuit 30. Storage battery 100
Is an energy supply circuit for supplying voltage by the power supply device 1 itself when the commercial power supply AC fails. The inverter circuit 12 receives the DC voltage obtained by the conversion circuit 11 or the DC voltage of the storage battery 100, and receives, for example, 50 Hz, 5
An alternating voltage of 5 Hz, 60 Hz, etc. is created. Bypass line 13
Are provided in parallel with the inverter circuit 12 and are connected to the commercial power source A.
Supply C to the load as it is. The switching circuit 70 selects either the output of the inverter circuit 12 or the output of the bypass line 13.

The electronic devices 20-1, 20-2, ... Operate by receiving the output of either the inverter circuit 12 or the bypass line 13 selected by the switching circuit 70.
Further, inside the electronic devices 20-1, 20-2, ..., a harmonic suppression circuit 40- for suppressing a harmonic component, respectively.
1, 40-2 ... Are provided.

Here, in the third embodiment, the power supply device 1 is provided with a shunt 130, a level converter 57 and a signal generating circuit 50. The shunt 130 is provided on the output side of the storage battery 100 and detects the discharge current of the storage battery 110. The level converter 57 smoothes the discharge current of the storage battery 100 detected by the shunt 130 with an internal reduction filter, then level-converts it and outputs it to the signal generation circuit 50. The signal generation circuit 50, based on the output of the level converter 57, when the storage battery 100 is in a discharged state,
Control signal 5 to stop the harmonic suppression function on the load side
1 is output.

Further, the electronic equipment 20-1, 20-2, ... Receives the control signal 51 and receives the harmonic suppression circuit 40-.
Reception circuit 60 for stopping the operation of 1, 40-2.
-1, 60-2 ... Are provided.

Next, the operation of the third embodiment will be described. In the case of a system using UPS of the constant inverter power supply system, the commercial power supply AC is usually converted into a predetermined AC voltage and supplied to the load by the inverter operation. That is, in FIG. 3, the output of the inverter circuit 12 is selected by the switching circuit 70, and the electronic devices 20-1, 20-2, ... On the load side operate using the output of the inverter circuit 12 as an input power source. .

Here, when a power failure occurs in the commercial power supply AC,
The power supply device 1 continues to supply power to the electronic devices 20-1, 20-2 ... Using the voltage stored in the storage battery 100. In this case, the voltage energy of the storage battery 100 is limited, and if the harmonic suppression function works on the load side,
The storage battery 100 is wastefully used due to power loss.

In the third embodiment, it is judged from the discharge current of the storage battery 100 that the commercial power supply AC is in a power failure state. That is, the storage battery 100 is divided by the shunt 130.
When the discharge current is detected, the detection signal is given to the signal generating circuit 50 through the level converter 57, and the signal generating circuit 50 outputs the control signal 51 to the load.
The output of the control signal 51 causes the electronic devices 20-1 and 20-2.
0-2 ... Stops the operation of the harmonic suppression circuits 40-1 and 40-2 inside the device through the reception circuits 60-1 and 60-2.

As described above, the U of the continuous inverter power feeding system is used.
In the system using the PS, even if the discharge state of the battery is detected and the harmonic suppression function on the load side is controlled, the battery consumption at the time of power failure is reduced as in the second embodiment. Efficient power supply can be performed.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described. Here, UPS of continuous commercial power supply system
In the system using, the harmonic suppression function on the load side is controlled.

FIG. 4 is a block diagram showing the configuration of a system using UPS of the constant commercial power supply system according to the fourth embodiment. Note that in FIG. 4, the same parts as those in FIG. The present system includes a power supply device 1 that receives a commercial power supply AC that is an energy source of the system and supplies AC power to a load, and a plurality of electronic devices 20-1 that operate by receiving the power supply supplied by the power supply device 1. 20-2
It consists of ...

The power supply device 1 includes a charger 15 and a diode 1.
40, a storage battery 100, a switch 150, an inverter circuit 12, a bypass line 13, and a switching circuit 70. The charger 15 is provided on the input side of the commercial power supply AC,
It has an output capacity capable of charging the storage battery 100 and operating the inverter circuit 12 without load. The diode 140 is for preventing current from flowing backward from the storage battery 100. The storage battery 100 is, for example, an energy supply circuit for supplying a voltage by the power supply device 1 itself in the event of a commercial power supply AC power failure. The switch 150 is for discharging the storage battery 100. The inverter circuit 12 receives the DC voltage obtained by the conversion circuit 11 or the DC voltage of the storage battery 100 and receives, for example, 50 Hz, 55
AC voltage such as Hz and 60 Hz is generated. Bypass line 13
Are provided in parallel with the inverter circuit 12 and are connected to the commercial power source A.
Supply C to the load as it is. The switching circuit 70 selects either the output of the inverter circuit 12 or the output of the bypass line 13.

The electronic devices 20-1, 20-2, ... Operate by receiving the output of either the inverter circuit 12 or the bypass line 13 selected by the switching circuit 70.
Further, inside the electronic devices 20-1, 20-2, ..., a harmonic suppression circuit 40- for suppressing a harmonic component, respectively.
1, 40-2 ... Are provided.

Here, in the fourth embodiment, the power supply device 1 is provided with a connection detection circuit 80 and a signal generation circuit 50. The connection detection circuit 80 is a switching circuit 70.
Detects that the output of the inverter circuit 12 or the output of the bypass line 13 is selected. Signal generation circuit 50
Outputs a control signal 51 for stopping the harmonic suppression function on the load side when the switching circuit 70 selects the output of the inverter circuit 12 based on the detection result of the connection detection circuit 80.

Further, the electronic equipment 20-1, 20-2, ... Receives the control signal 51 and receives the harmonic suppression circuit 40-.
Reception circuit 60 for stopping the operation of 1, 40-2.
-1, 60-2 ... Are provided.

Next, the operation of the fourth embodiment will be described. In the case of a system using UPS of the continuous commercial power supply system,
Normally, commercial power supply AC power is directly supplied to the load by commercial operation. That is, in FIG. 4, the switching circuit 7
The output of the bypass line 13 is selected by 0, and the electronic devices 20-1, 20-2, ... On the load side operate using the output of the bypass line 13 as an input power source. In this case, the electronic devices 20-1, 20-2, ... Are provided with the harmonic suppression circuits 40-1, 40-2 inside, and the suppression circuit 4 is provided.
0-1 and 40-2 suppress the harmonics of the input power supply.

When a power failure occurs in the commercial power supply AC, the commercial operation is switched to the inverter operation. Charger 15
Charges the storage battery 100 and at the same time the inverter circuit 12
Has an output capacity that can maintain the no-load operation state of.
As a result, when a power failure occurs in the commercial power supply AC, the switching circuit 70 is switched to the inverter side, so that power can be continuously supplied from the inverter circuit 12 with a delay of the switch switching time. In this case, the switch 150 is turned on at the same time when the switching circuit 70 is switched to the inverter side so that the storage battery 100 can flow the discharge current corresponding to the full load.

Here, in the UPS of the constant commercial power feeding system, since the harmonics do not flow back to the commercial power supply AC side due to the power failure of the commercial power supply AC, the harmonics do not flow back to the commercial power supply AC side. It becomes unnecessary. Therefore, at the time of a power failure of the commercial power source, similarly to the case of the constant inverter power supply system, power loss occurs due to the harmonic suppression function on the load side, and the storage battery 100 is quickly consumed.

In the fourth embodiment, the switching circuit 70
When the output of the inverter circuit 12 is selected, the state is detected by the connection detection circuit 80 and the signal generation circuit 50 is detected.
Outputs a control signal 51 to the load. By the output of the control signal 51, the electronic devices 20-1, 20-2 ...
Then, the operation of the harmonic suppression circuits 40-1 and 40-2 inside the device is stopped through the reception circuits 60-1 and 60-2.

As described above, in the system using the UPS of the constant commercial power supply system, when the inverter output is supplied to the load as the input power source in the inverter operation at the time of power failure, the harmonic suppressing function on the load side is stopped. As a result, power loss on the load side can be prevented and power can be efficiently supplied.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described. Here, UPS of continuous commercial power supply system
In the system using the above, particularly, the harmonic suppression function on the load side is controlled by detecting the discharge current of the battery.

FIG. 5 is a block diagram showing the configuration of a system using UPS of the constant commercial power supply system according to the fifth embodiment. Note that, in FIG. 5, the same parts as those in FIG. The present system includes a power supply device 1 that receives a commercial power supply AC that is an energy source of the system and supplies AC power to a load, and a plurality of electronic devices 20-1 that operate by receiving the power supply supplied by the power supply device 1. 20-2
It consists of ...

The power supply device 1 includes a charger 15, a diode 1
40, a storage battery 100, a switch 150, an inverter circuit 12, a bypass line 13, and a switching circuit 70. The charger 15 is provided on the input side of the commercial power supply AC,
It has an output capacity capable of charging the storage battery 100 and operating the inverter circuit 12 without load. The diode 140 is for preventing current from flowing backward from the storage battery 100. The storage battery 100 is, for example, an energy supply circuit for supplying a voltage by the power supply device 1 itself in the event of a commercial power supply AC power failure. The switch 150 is for discharging the storage battery 100. The inverter circuit 12 receives the DC voltage obtained by the conversion circuit 11 or the DC voltage of the storage battery 100 and receives, for example, 50 Hz, 55
AC voltage such as Hz and 60 Hz is generated. Bypass line 13
Are provided in parallel with the inverter circuit 12 and are connected to the commercial power source A.
Supply C to the load as it is. The switching circuit 70 selects either the output of the inverter circuit 12 or the output of the bypass line 13.

The electronic devices 20-1, 20-2, ... Operate by receiving the output of either the inverter circuit 12 or the bypass line 13 selected by the switching circuit 70.
Further, inside the electronic devices 20-1, 20-2, ..., a harmonic suppression circuit 40- for suppressing a harmonic component, respectively.
1, 40-2 ... Are provided.

Here, in the fifth embodiment, the power supply device 1 is provided with a shunt 130, a level converter 57 and a signal generating circuit 50. The shunt 130 is provided on the output side of the storage battery 100 and detects the discharge current of the storage battery 110. The level converter 57 smoothes the discharge current of the storage battery 100 detected by the shunt 130 with an internal reduction filter, then level-converts it and outputs it to the signal generation circuit 50. The signal generation circuit 50, based on the output of the level converter 57, when the storage battery 100 is in a discharged state,
Control signal 5 to stop the harmonic suppression function on the load side
1 is output.

Further, the electronic equipment 20-1, 20-2, ... Receives the control signal 51 and receives the harmonic suppression circuit 40-.
Reception circuit 60 for stopping the operation of 1, 40-2.
-1, 60-2 ... Are provided.

Next, the operation of the fifth embodiment will be described. In the case of a system using UPS of the continuous commercial power supply system,
Normally, by bypass operation, the commercial power supply AC is directly supplied to the load through the bypass line 13. That is, in FIG. 5, the output of the bypass line 13 is selected by the switching circuit 70, and the electronic device 20-1 on the load side,
20-2 ... Operates with the output of the bypass line 13 as an input power source.

Here, if a power failure occurs in the commercial power supply AC,
The power supply device 1 continues to supply power to the electronic devices 20-1, 20-2 ... Using the voltage stored in the storage battery 100. In this case, the voltage energy of the storage battery 100 is limited, and if the harmonic suppression function works on the load side,
The storage battery 100 is wastefully used due to power loss.

In the fifth embodiment, it is judged from the discharge current of the storage battery 100 that the commercial power supply AC is in a power failure state. That is, the storage battery 100 is divided by the shunt 130.
When the discharge current is detected, the detection signal is given to the signal generating circuit 50 through the level converter 57, and the signal generating circuit 50 outputs the control signal 51 to the load.
The output of the control signal 51 causes the electronic devices 20-1 and 20-2.
0-2 ... Stops the operation of the harmonic suppression circuits 40-1 and 40-2 inside the device through the reception circuits 60-1 and 60-2.

As described above, in the system using the UPS of the constant commercial power feeding system, the structure in which the discharge state of the battery is detected and the harmonic suppressing function on the load side is controlled is similar to the fourth embodiment. , It is possible to reduce the battery consumption at the time of power failure and to supply power efficiently.

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described. Here, in a system using an active filter and a distributed power supply, the harmonic suppression function on the load side and the distributed power supply side is controlled.

FIG. 6 is a block diagram showing the configuration of a system using an active filter and a distributed power source according to the sixth embodiment. Note that, in FIG. 6, the same parts as those in FIG. This system includes a commercial power supply device including a current transformer 210 and an active filter 200, a distributed power supply device including a solar cell 300 and an energy conversion device 320, and a plurality of power supply devices that operate by receiving power supplied from these power supply devices. Electronic devices 20-1 and 20-2
It consists of 0-2.

The current transformer 210 is provided on the AC input side of the commercial power supply and detects the input current. Active filter 20
0 receives the input current from the commercial power supply AC through the current transformer 210, and supplies a current having a phase opposite to that of its harmonic component to the system input end.

The solar cell 300 is a system separate from the commercial power supply AC and supplies the power required by the system. The energy conversion device 320 converts the energy of the solar cell 300 into energy of a commercial frequency and supplies the energy to the load side, and has an inverter circuit 340 inside. The inverter circuit 340 converts the DC voltage of the solar cell 300 into an AC voltage of commercial frequency. A harmonic suppression circuit 340a for reducing a harmonic current is provided on the commercial power supply connection end side (inverter output side) of the inverter circuit 340.

The electronic devices 20-1, 20-2, ... Output either the commercial power supply device including the current transformer 210 and the active filter 200 or the distributed power supply device including the solar cell 300 and the energy conversion device 320. Receive and operate. Further, inside the electronic devices 20-1, 20-2, ..., Harmonic suppression circuits 40-1, 40-2 ,.

In the figure, i is current, which is the commercial power supply AC.
Shows the net current flowing into the system from. iA is a current, and represents a combination of currents flowing from the commercial side to the load (electronic device). iB is the current and the active filter 2
00 shows the out-of-phase harmonic currents injected into the system from 00. ic is a current and is on the distributed power source side (inverter circuit 3
40) shows the current supplied to the load (electronic device) from 40).

Here, in the sixth embodiment, the active filter 200 is provided with a signal generating circuit 50. The signal generation circuit 50 includes an active filter 200.
Is operating normally, the control signal 51 for stopping the harmonic suppressing function on the load side is output.

In order to stop the operation of the harmonic suppression circuits 40-1, 40-2 ... In response to the control signal 51, the energy conversion device 320 and the electronic devices 20-1, 20-2. Receiving circuits 360, 60-1, 60-2
... is provided.

Next, the operation of the sixth embodiment will be described. In the system using the active filter 200, a separated power source is drawing attention from the viewpoints of future efficient use of resources, energy saving, and measures to reduce peak load in midsummer. This is a combination of a commercial power supply system and a small-scale power generation facility installed individually by each customer, for example, partial power generation such as solar cell power generation, and the energy generated by the customer cannot be consumed by that customer. The surplus energy is supplied to the power system.

In such a power supply system, the harmonic suppression circuit 340a uses a power generator (eg, a power generator) so that the electric power injected from the customer into the system becomes a current with harmonics reduced (close to a sine waveform). In the power generation using the solar cell 100, it is built in the inverter circuit 340). In the case of a load in which the electric power injected into the grid is larger than that consumed by the customer, the harmonic components of the electric power injected into the grid will be small even if harmonic suppression is not performed on the load side. Become. That is,
The harmonics can be reduced below the regulation limit without taking measures against the harmonics in the load side electronic devices 20-1, 20-2 ....

On the other hand, by providing the current transformer 210 at the power receiving end of the customer and observing the harmonic current amount of the input current,
The harmonic suppression function in each of the electronic devices 20-1, 20-2 ... Can be stopped. When the power generation output at the customer decreases and it becomes impossible to inject back to the grid side, the harmonic content of the inflow current at the power receiving end increases. When the active filter 200 is provided at the power receiving end, it is possible to suppress harmonics even when the generated power is zero.

As described above, when the active filter 200 is provided, the harmonics are suppressed. Therefore, if the harmonics suppressing function works on the distributed power source and the load side, the efficiency of the entire system is increased. Will be reduced.

In the sixth embodiment, the current transformer 210 observes the input current at the power receiving end, and the harmonic current having the opposite phase to the inflow current is injected through the active filter 200 to suppress the harmonic. In this case, if the harmonic current flowing back to the system is less than or equal to the regulation value, the signal generation circuit 50 of the active filter 200 outputs the control signal 51 to the electronic devices 20-1 and 20-2. By the output of the control signal 51, the receiving circuit 60-in the electronic devices 20-1, 20-2, ...
1, 60-2 through the harmonic suppression circuit 40 inside the device
The operations of 1 and 40-2 are stopped. The control signal 51 is also output to the energy conversion device 320 on the distributed power source side.
As a result, in the energy conversion device 320, the receiving circuit 36
Through 0, the operation of the harmonic suppression circuit 340a inside the inverter circuit 340 is stopped.

As described above, in the system using the active filter, when the active filter is functioning, by stopping the harmonic suppressing function on the load side, power loss on the load side is prevented and efficiency is improved. Can be powered. When a distributed power supply is used, the efficiency of the entire system can be improved by stopping the harmonic suppression function on the distributed power supply side at the same time.

(Seventh Embodiment) Next, a seventh embodiment of the present invention will be described. Here, in the system using the active filter and the distributed power supply, the harmonic suppression function on the load side and the distributed power supply side is controlled according to the level of the harmonic component.

FIG. 7 is a block diagram showing the configuration of a system using an active filter and a distributed power source according to the seventh embodiment. In FIG. 7, the same parts as those in FIGS. 1 and 6 are designated by the same reference numerals for description. This system includes a commercial power supply device including a current transformer 210 and an active filter 200, a solar cell 300, and an energy conversion device 3.
20 and a plurality of electronic devices 20 that operate by receiving the power supplied by these power supply devices.
-1, 20-2 ...

The current transformer 210 is provided on the AC input side of the commercial power supply and detects the input current. Active filter 20
0 receives the input current from the commercial power supply AC through the current transformer 210, and supplies a current having a phase opposite to that of its harmonic component to the system input end.

The solar cell 300 is a system separate from the commercial power supply AC and supplies the power required by the system. The energy conversion device 320 converts the energy of the solar cell 300 into energy of a commercial frequency and supplies the energy to the load side, and has an inverter circuit 340 inside. The inverter circuit 340 converts the DC voltage of the solar cell 300 into an AC voltage of commercial frequency. A harmonic suppression circuit 340a for reducing a harmonic current is provided on the commercial power supply connection end side (inverter output side) of the inverter circuit 340.

The electronic devices 20-1, 20-2, ... Output the output of either the commercial power supply device including the current transformer 210 and the active filter 200 or the distributed power supply device including the solar cell 300 and the energy conversion device 320. Receive and operate. Further, inside the electronic devices 20-1, 20-2, ..., Harmonic suppression circuits 40-1, 40-2 ,.

In the figure, i is current, which is the commercial power supply AC.
Shows the net current flowing into the system from. iA is a current, and represents a combination of currents flowing from the commercial side to the load (electronic device). iB is the current and the active filter 2
00 shows the out-of-phase harmonic currents injected into the system from 00. ic is a current and is on the distributed power source side (inverter circuit 3
40) shows the current supplied to the load (electronic device) from 40).

Here, in the seventh embodiment, a current transformer 410 and a control circuit 400 are provided on the commercial power source side. The current transformer 410 detects the harmonic component of the current flowing from the commercial power supply AC. The control circuit 400 controls the harmonic suppression function provided on the load side and the distributed power source side individually or in groups. This control circuit 4
Reference numeral 00 includes a comparator 430, a reference value generator 420, level detectors (indicated by LD in the figure) 441 to 443, and signal generation circuits (indicated by SG in the figure) 451 to 453.

In the control circuit 400, the reference value generator 420 sets the limit value (allowable value) of the harmonic current.
The comparator 430 compares the harmonic current flowing from the commercial power supply AC with the limit value of the reference value generator 420, and outputs an error signal according to the error. Level detectors 441-44
Reference numeral 3 compares the input error signal from the comparator 430 with a set level, and when it is smaller than the set level, outputs a signal for operating the harmonic suppressing function on the load side and the distributed power source side. The signal generation circuits 451 to 453 use the control signal 51 for stopping the harmonic suppression function on the load side and the distributed power source side.
Outputs −0, 51-1, 51-2, ...

The electronic equipments 20-1, 20-2, ... Receive the control signals 51-1, 51-2 ,.
Receiving circuits 60-1, 60-2 ... For stopping the operation of 0-1, 40-2. Similarly, the control signal 51-
A receiving circuit 360 is provided for receiving 0 and stopping the operation of the harmonic suppression circuit 340a.

Next, the operation of the seventh embodiment will be described. When the capacity of the active filter 200 is small, the active filter 200 and the electronic devices 20-1 and 20-2
It is necessary for the harmonic suppression circuits 40-1 and 40-2 of ... To jointly suppress the harmonic current flowing back to the commercial power supply AC to a regulated value or less. In this case, when the number of devices in the movable state is small among the electronic devices 20-1, 20-2, ... Which constitute the system, the active filter 200 alone can suppress the harmonic current within the limit. it can.

Therefore, in the seventh embodiment, the input current to the system is observed by the current transformer 410, and the harmonic components contained therein are analyzed. In the control circuit 400, this harmonic component is compared with the limit value, and if the harmonic component is smaller than the limit value, the operating electronic devices 20-1, 20-2
The control signals 51-1, 51-2, ... Are output so as to stop the harmonic suppression function of ... Only the number of units corresponding to the level at that time.

In this case, the number of stopped units can be changed by adjusting the number of electronic devices 20-1, 20-2, ... Connected to the signal generating circuits 452, 453 ,. It is also possible to group the number of units suitable for keeping them within the limit value according to the number of devices used in operation. Further, it is possible to stop including the harmonic suppressing function on the distributed power source side.

As described above, in the system using the active filter, when the active filter is functioning, the harmonic suppression function on the load side is stopped according to the level of the harmonic component, so that the load side is stopped. It is possible to prevent power loss and efficiently supply power. When a distributed power supply is used, the efficiency of the entire system can be improved by stopping the harmonic suppression function on the distributed power supply side at the same time.

(Eighth Embodiment) In the above-mentioned first to seventh embodiments, the load side harmonic suppressing function is controlled by a signal. However, here, the load side harmonic wave is not used. It is characterized by controlling the suppression function. In particular, the eighth embodiment is characterized in that the control is performed based on the frequency of the power source that the load side receives power. The control method shown here can be similarly applied to a system using an active filter or a distributed power supply system as long as it is the UPS (always inverter power feeding method, always commercial power feeding method) described above. Further, when each device is provided with this control method, these devices can be incorporated in the system or can be used alone.

FIG. 8 is a block diagram showing the configuration of a system using the control system according to the eighth embodiment. Note that FIG.
In FIG. 1, the same parts as those in FIG. This system is a power supply device 1 that receives a commercial power supply AC that is an energy source of the system and supplies AC power to a load.
a and a plurality of electronic devices 20-1 ... Which operate by receiving the power supplied by the power supply device 1a.

The power supply device 1a is a UPS of the constant inverter power supply system or the constant commercial power supply system. The power supply device 1a includes an inverter circuit 2a and a switching circuit 70.
And receives the commercial power supply AC, here, the commercial power supply A
Output an AC voltage with a frequency different from the frequency of C,
Alternatively, the commercial power supply AC is directly output. The inverter circuit 2a converts the voltage of the commercial power source AC or a storage battery (not shown) into an AC voltage having a predetermined frequency. The switching circuit 70 selects either the commercial power supply AC or the output of the inverter circuit 2a.

The electronic device 20-1 operates by receiving the power supply or the commercial power supply AC supplied from the power supply device 1a, and internally operates the harmonic suppression circuit 40-1 for suppressing the harmonic components.
Have.

[0125] In the figure, reference character A indicates a disconnection point in the case of direct connection operation with the commercial power supply AC without using the power supply device 1a. Reference symbol B indicates a portion to which the commercial power source AC is connected in the case of the commercial direct connection. Reference symbol C indicates a direct connection to a commercial power source.

Here, in the eighth embodiment, the electronic device 20
-1 is provided with a frequency discrimination circuit 61-1. The frequency discriminating circuit 61-1 discriminates the frequency of the received voltage, and when it detects that the frequency is generated by the power supply device 1a, outputs a signal for stopping the operation of the harmonic suppression circuit 40-1. When it outputs and outputs the signal of the frequency of the commercial power supply AC, it outputs a signal for operating the harmonic suppression circuit 40-1.

Next, the operation of the eighth embodiment will be described. When the AC voltage converted by the inverter circuit 2a in the power supply device 1a is supplied to the load-side electronic device 20-1 as an input power supply, since harmonic suppression has already been performed on the power supply side, There is no need for harmonic suppression on the side. on the other hand,
When the commercial power supply AC is directly supplied to the electronic device 20-1 on the load side, the harmonic suppression on the load side is unnecessary because the harmonic suppression is not already performed on the power supply side.

As described above, it is necessary to control the harmonic suppressing function on the load side depending on whether the power supply supplied to the load is unique to the power supply device 1a or the commercial power supply AC.

Therefore, the eighth embodiment is characterized in that the power supply supplied to the load is determined based on the frequency of the input power supply. That is, when power is supplied to the electronic device 20-1, the frequency determining circuit 61-1 provided in the electronic device 20-1 determines the frequency of the input power source. As a result, if the frequency of the input power supply is a value unique to the power supply device 1a, the harmonic suppression operation of the electronic device 20-1 is stopped and controlled.

More specifically, for example, when the frequency of the commercial power supply AC received by the consumer is 50 Hz, the discrimination frequency range in the frequency discrimination circuit 61-1 is 49 to 5.
Set to 1 Hz. As a result, the frequency is 45 to 4
When power is supplied at 8 Hz or 52 to 66 Hz, it can be determined that the frequency is not the commercial power frequency, and the operation of the harmonic suppression function on the load side can be stopped. Also,
Even if the frequency of the commercial power supply AC is 60 Hz, 5
By selecting 9 to 61 Hz as the discrimination frequency range, it is possible to distinguish between commercial power reception and private power supply.

In this way, by determining the type of power source based on the frequency of the input power source and controlling the harmonic suppression function on the load side, the efficiency is improved without the need for a special control line for function control. Power supply can be performed.

(Ninth Embodiment) Next, a ninth embodiment of the present invention will be described. Here, the harmonic suppression function on the load side is controlled without using a signal line, and in particular, the control is performed based on the voltage value of the power supply received by the load side. Note that the control method shown here is the same as the already described UPS.
As long as it is a constant inverter power supply system or a constant commercial power supply system, it can be similarly applied to a system using an active filter or a distributed power supply system. Further, when each device is provided with this control method, these devices can be incorporated in the system or can be used alone.

FIG. 9 is a block diagram showing the configuration of a system using the control system according to the ninth embodiment. Note that FIG.
In FIG. 1, the same parts as those in FIG. This system is a power supply device 1 that receives a commercial power supply AC that is an energy source of the system and supplies AC power to a load.
b, and a plurality of electronic devices 20-1 that operate by receiving the power supplied from the power supply device 1b.

The power supply device 1b is a UPS of the constant inverter power supply system or the constant commercial power supply system. The power supply device 1b includes an inverter circuit 2b and a switching circuit 70.
And receives the commercial power supply AC, here, the commercial power supply A
Output an AC voltage with a voltage value different from C, or
The commercial power supply AC is directly output. The inverter circuit 2b is
The voltage of the commercial power source AC or a storage battery (not shown) is converted into an AC voltage having a predetermined voltage value. The switching circuit 70 is
Either the commercial power supply AC or the output of the inverter circuit 2b is selected.

The electronic device 20-1 operates by receiving the power supply or the commercial power supply AC supplied from the power supply device 1b, and internally operates the harmonic suppression circuit 40-1 for suppressing the harmonic components.
Have.

In the figure, reference character A indicates a disconnection point in the case of direct connection operation with the commercial power supply AC without using the power supply device 1b. Reference symbol B indicates a portion to which the commercial power source AC is connected in the case of the commercial direct connection. Reference symbol C indicates a direct connection to a commercial power source.

Here, in the ninth embodiment, the electronic device 20
-1 is provided with a voltage determination circuit 62-1. The voltage determination circuit 62-1 determines the voltage value of the received voltage, and when it detects that the voltage value is generated by the power supply device 1b, stops the operation of the harmonic suppression circuit 40-1. When a signal is output and it is detected that the voltage is the voltage of the commercial power supply AC, a signal for operating the harmonic suppression circuit 40-1 is transmitted.

Next, the operation of the ninth embodiment will be described. When the AC voltage converted by the inverter circuit 2b in the power supply device 1b is supplied to the load-side electronic device 20-1 as an input power supply, since harmonic suppression has already been performed on the power supply side, There is no need for harmonic suppression on the side. on the other hand,
When the commercial power supply AC is directly supplied to the electronic device 20-1 on the load side, the harmonic suppression on the load side is unnecessary because the harmonic suppression is not already performed on the power supply side.

As described above, it is necessary to control the harmonic suppression function on the load side depending on whether the power source supplied to the load is unique to the power source device 1b or the commercial power source AC.

Therefore, the ninth embodiment is characterized in that the power supply to be supplied to the load is determined based on the voltage value of the input power supply. That is, when power is supplied to the electronic device 20-1, the voltage determining circuit 62-1 provided in the electronic device 20-1 determines the voltage value of the input power source. As a result, if the voltage value of the input power supply is a value unique to the power supply device 1b, the harmonic suppression operation of the electronic device 20-1 is stopped and controlled.

More specifically, if the nominal value of the commercial power supply voltage received by the customer is 100V, the legal supply voltage is 101 ± 6V. Therefore, the customer is U
When using PS, the output voltage of UPS is a value that avoids this voltage range, for example, 90 to 94V or 1
Set to 07-110V. In addition, the voltage determination circuit 62-
The determination voltage range of 1 is set to 95 to 107V.

Here, the input voltage is 90 to 94 or 10
When the voltage is 7 to 110 V, the voltage determination circuit 62-1 determines that the operation is from the power supply device 1b (UPS) and sends a signal to stop the operation to the harmonic suppression circuit 40-1. As a result, the harmonic suppression operation of the electronic device 20-1 is stopped.

On the other hand, when the power supply 1b is switched to the commercial power supply AC, or when the power supply 1b (UP
When the power is directly supplied from the commercial power supply AC without installing S), the voltage determination circuit 62-1 determines that the received voltage value is 95 to
107V is detected and an operation signal is output to the harmonic suppression circuit 40-1. As a result, the electronic device 20-1 can perform the harmonic suppression operation.

As described above, by determining the type of power source based on the voltage value of the input power source and controlling the harmonic suppression function on the load side, a special control line for function control is not required, Efficient power supply can be performed.

(Tenth Embodiment) Next, the tenth embodiment of the present invention will be described.
An example will be described. Here, the harmonic suppression function on the load side is controlled without using a signal line, and in particular, the control is performed based on the voltage value of the power supply received by the load side. The control method shown here is based on the UP method already described.
If it is S (constant inverter power supply system, constant commercial power supply system), it can be similarly applied to a system using an active filter or a distributed power supply system. Further, when each device is provided with this control method, these devices can be incorporated in the system or can be used alone.

FIG. 10 is a block diagram showing the configuration of a system using the control system according to the tenth embodiment. In addition,
In FIG. 10, the same parts as those in FIG. The present system includes a power supply device 1c that receives a commercial power supply AC that is an energy source of the system and supplies AC power to a load, and a plurality of electronic devices 20-1 that operate by receiving the power supply supplied by the power supply device 1c. Consists of.

The power supply unit 1c is a UPS of the constant inverter power supply system or the constant commercial power supply system. The power supply device 1c includes an inverter circuit 2c and a switching circuit 70.
And receives the commercial power supply AC, here, the commercial power supply A
An AC voltage having a waveform different from that of C is output, or a commercial power supply AC is directly output. The inverter circuit 2c converts the voltage of the commercial power source AC or a storage battery (not shown) into an AC voltage having a predetermined waveform. The switching circuit 70 selects either the commercial power supply AC or the output of the inverter circuit 2c.

The electronic device 20-1 operates by receiving the power supply or the commercial power supply AC supplied from the power supply device 1c, and internally operates the harmonic suppression circuit 40-1 for suppressing the harmonic components.
Have.

In the figure, reference character A indicates a disconnection point when the direct connection operation is performed with the commercial power supply AC without using the power supply device 1c. Reference symbol B indicates a portion to which the commercial power source AC is connected in the case of the commercial direct connection. Reference symbol C indicates a direct connection to a commercial power source.

Here, in the tenth embodiment, the electronic device 2
A waveform discrimination circuit 63-1 is provided at 0-1. The waveform discrimination circuit 63-1 discriminates the waveform of the received voltage, and when detecting that the voltage of the waveform is generated by the power supply device 1b, stops the operation of the harmonic suppression circuit 40-1. When a signal is output and the voltage waveform of the commercial power supply AC is detected, a signal for operating the harmonic suppression circuit 40-1 is transmitted.

Next, the operation of the tenth embodiment will be described.
When the AC voltage converted by the inverter circuit 2c in the power supply device 1c is supplied to the load-side electronic device 20-1 as an input power supply, since harmonic suppression has already been performed on the power supply side, There is no need for harmonic suppression on the side. On the other hand, when the commercial power source AC is directly supplied to the electronic device 20-1 on the load side, the harmonic suppression on the load side is not necessary because the harmonic suppression is not already performed on the power supply side.

As described above, it is necessary to control the harmonic suppressing function on the load side depending on whether the power supply supplied to the load is unique to the power supply device 1c or the commercial power supply AC.

Therefore, the tenth embodiment is characterized in that the power supply supplied to the load is discriminated based on the voltage waveform of the input power supply. That is, when power is supplied to the electronic device 20-1, the waveform determining circuit 63-1 provided in the electronic device 20-1 determines the voltage waveform of the input power source. As a result, if the voltage waveform of the input power supply is unique to the power supply device 1c, the harmonic suppression operation of the electronic device 20-1 is stopped and controlled.

Specifically, the voltage waveform of the commercial power supply AC received by the consumer is almost a sine wave, and the output voltage waveform of the UPS is a square wave. The waveform discriminating circuit 63-1 discriminates between the commercial power source AC and the inverter output power source based on the difference in the voltage waveform.

In this case, the waveform discriminating circuit 63-1 is constituted by a circuit for detecting a peak value and an average value, an effective value and a peak value, or an effective value and an average value, so that the voltage waveform of the input power source to the load is It is possible to distinguish whether is a sine wave or a square wave. Alternatively, it can be determined by using a comparator provided with a window defined with respect to time.

When the waveform discrimination circuit 63-1 determines that the input voltage waveform is a square wave, the power supply device 1c
Assuming that power is supplied from (UPS), the harmonic suppression circuit 4
A stop signal is output at 0. As a result, the electronic device 20
The -1 harmonic suppression operation stops.

On the other hand, when the power supply 1c is switched to the commercial power supply AC, or when the power supply 1c (UP
When the power is directly supplied from the commercial power supply AC without installing S), since the sine wave is detected by the waveform determination circuit 63-1, the operation signal is output to the harmonic suppression circuit 40-1. As a result, the electronic device 20-1 can perform the harmonic suppression operation.

As described above, by determining the type of power source based on the voltage waveform of the input power source and controlling the harmonic suppression function on the load side, a special control line for function control is not required, Efficient power supply can be performed.

(Eleventh Embodiment) Next, the eleventh embodiment of the present invention will be described.
An example will be described. Here, the harmonic suppression function on the load side is controlled without using a signal line, and in particular, the control is performed based on the jitter of the frequency of the power source received by the load side. The control method shown here can be similarly applied to a system using an active filter or a distributed power supply system as long as it is the UPS (always inverter power feeding method, always commercial power feeding method) described above. Further, when each device is provided with this control method, these devices can be incorporated in the system or can be used alone.

FIG. 11 is a block diagram showing the configuration of a system using the control system according to the eleventh embodiment. In addition,
In FIG. 11, the same parts as those in FIG. This system includes a power supply device 1d that receives a commercial power supply AC that is an energy source of the system and supplies AC power to a load, and a plurality of electronic devices 20-1 that operate by receiving the power supply supplied by the power supply device 1d. Consists of.

The power supply device 1d is a UPS of the constant inverter power supply system or the constant commercial power supply system. The power supply device 1d includes an inverter circuit 2d and oscillators 12a and 12b.
And a switching circuit 70, which receives the commercial power supply AC and outputs an AC voltage having a frequency different from that of the commercial power supply AC or the same frequency as the jitter, or directly outputs the commercial power supply AC. . Inverter circuit 2d
Converts the voltage of the commercial power source AC or a storage battery (not shown) into an AC voltage having a predetermined jitter. Switching circuit 70
Selects either the commercial power supply AC or the output of the inverter circuit 2d.

The oscillator 12a outputs a frequency obtained by superimposing jitter on the received voltage frequency or the original frequency. The oscillator 12b generates a low frequency that determines the jitter. The electronic device 20-1 operates by receiving a power supply or a commercial power supply AC supplied from the power supply device 1d, and internally has a harmonic suppression circuit 40-1 for suppressing a harmonic component.

In the figure, reference character A indicates a disconnection point in the case of direct connection operation with the commercial power supply AC without using the power supply device 1d. Reference symbol B indicates a portion to which the commercial power source AC is connected in the case of the commercial direct connection. Reference symbol C indicates a direct connection to a commercial power source.

Here, in the ninth embodiment, the electronic device 20
-1 is provided with a jitter detection circuit 64-1. The jitter detection circuit 64-1 detects the jitter included in the frequency of the power reception voltage, and when the jitter detection circuit 64-1 detects that the jitter is unique to the power supply device 1d, the harmonic suppression circuit 40-1.
When the jitter cannot be detected, it is determined to be the commercial power supply voltage, and the signal for operating the harmonic suppression circuit 40-1 is transmitted.

Next, the operation of the eleventh embodiment will be described.
When the AC voltage converted by the inverter circuit 2d in the power supply device 1d is supplied as the input power source to the electronic device 20-1 on the load side, the harmonics have already been suppressed on the power source side. There is no need for harmonic suppression on the side. On the other hand, when the commercial power source AC is directly supplied to the electronic device 20-1 on the load side, the harmonic suppression on the load side is not necessary because the harmonic suppression is not already performed on the power supply side.

As described above, it is necessary to control the harmonic suppressing function on the load side depending on whether the power supply supplied to the load is unique to the power supply device 1d or the commercial power supply AC.

Therefore, the eleventh embodiment is characterized in that the power supply supplied to the load is determined based on the jitter included in the frequency of the input power supply. That is, when power is supplied to the electronic device 20-1, the jitter detection circuit 64-1 provided in the electronic device 20-1 detects the jitter included in the frequency of the input power supply. As a result, when the jitter peculiar to the power supply device 1c is detected, the harmonic suppression operation of the electronic device 20-1 is stopped and controlled.

More specifically, the frequency of the commercial power supply AC received by the customer is usually stable. Therefore, it is possible to generate a predetermined jitter in the frequency of the AC voltage generated by the power supply device 1d (UPS). The oscillator 12a of the inverter circuit 2d oscillates a required output angular frequency ω0. On the other hand, the oscillator 12b oscillates the angular frequency ω1 set lower than the angular frequency of the oscillator 12a. Therefore, the inverter angular frequency causes a jitter of the variation width of Δω (the variation frequency = ω1) around ω0.

Here, when the inverter angular frequency when the jitter is generated is ω 0 ^* , it is expressed by the following equation (1). ω0 ^* = ω0 · (1 + k · sinω1 · t) (1) where ω1: angular frequency of oscillator 12a ω2: angular frequency of oscillator 12b (however, ω1 is set so that ω0> ω1) k: A constant t depending on the output voltage amplitude of the oscillator 12b: time Therefore, the magnitude of Δω is determined by the output amplitude of the oscillator 12b. When the jitter detection circuit 64-1 provided in the load side electronic device 20-1 detects the jitter,
It determines that the received voltage is from the power supply device 1d (UPS) and outputs an operation stop signal to the harmonic suppression circuit 40-1. As a result, the harmonic suppression operation of the electronic device 20-1 is stopped.

On the other hand, when the power supply 1c is switched to the commercial power supply AC, or when the power supply 1c (UP
When the power is directly supplied from the commercial power supply AC without installing S), the jitter is not detected.
-1 determines that the operation is performed by the commercial power supply AC, and outputs a signal for operating the harmonic suppression circuit 40. As a result, the electronic device 20-1 can perform the harmonic suppression operation.

As described above, by determining the type of power source based on the jitter included in the frequency of the input power source and controlling the harmonic suppression function on the load side, a special control line for function control is required. It is possible to perform efficient power supply without doing so.

[0172]

As described above, according to the present invention, the following effects can be obtained. (1) In the system using the UPS of the constant inverter power feeding system, it is possible to save energy during commercial power reception by stopping the harmonic suppression circuit of the load side device as necessary.

(2) In the system using the UPS of the continuous commercial power supply system, the same device can be used regardless of the system configuration by operating the harmonic suppression circuit of the Shenzhen device during the commercial power supply. it can. For this reason, it can always be used in an optimal operating state regardless of the configuration and power receiving status.

(3) Even in the constant inverter power supply system or the constant commercial power supply system, by stopping the harmonic suppression circuit of the load side device at the time of power failure, the energy of the storage battery can be saved and the power can be efficiently supplied. It can be performed.

(4) In a system equipped with an active filter, harmonic suppression is performed on the active filter side,
By stopping the operation of the harmonic suppression circuit in the device on the load side, it is possible to save energy in the entire system and to efficiently supply power.

(5) Even when a distributed power supply system intended for reverse power flow is used together, harmonic suppression is performed on the active filter side, and harmonics are suppressed on the load side device and the distributed power supply side. By stopping the operation of the suppression circuit, it is possible to save energy in the entire system and efficiently supply power.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a system according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing the configuration of a system according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing the configuration of a system according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing the configuration of a system according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a system according to a sixth embodiment of the present invention.

FIG. 7 is a block diagram showing the configuration of a system according to a seventh embodiment of the present invention.

FIG. 8 is a block diagram showing the configuration of a system according to an eighth embodiment of the present invention.

FIG. 9 is a block diagram showing the configuration of a system according to a ninth embodiment of the present invention.

FIG. 10 is a block diagram showing the configuration of a system according to a tenth embodiment of the present invention.

FIG. 11 is a block diagram showing the configuration of a system according to an eleventh embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Power supply device, 11 ... Conversion circuit, 12 ... Inverter circuit, 20-1, 20-2 ... Electronic equipment, 30 ... Harmonic suppression circuit, 40-1, 40-2 ... Harmonic suppression circuit, 50 ... Signal generation Circuit, 51 ... Control signal, 60-1, 60-2 ... Receiving circuit, 80 ... Connection detection circuit, 110 ... Power failure detection circuit,
56 ... AND circuit, 130 ... Shunt, 57 ... Level converter, 15 ... Charger, 100 ... Storage battery, 140 ... Diode, 150 ... Switch, 200 ... Active filter,
210 ... Current transformer, 300 ... Solar cell, 320 ... Energy conversion device, 340 ... Inverter circuit, 340a ... Harmonic suppression circuit, 400 ... Control circuit, 410 ... Current transformer, 420
Reference value generator, 430 Comparator, 441 to 443 ... Level detector, 451 to 453 ... Signal generating circuit, 61-1
... frequency discrimination circuit, 62-1 ... voltage discrimination circuit, 63-1
... Waveform discrimination circuit, 64-1 ... Jitter detection circuit.

Claims (17)

[Claims] 1. A harmonic suppression circuit for receiving a commercial power supply and suppressing a harmonic component thereof, a conversion circuit for receiving the output of the harmonic suppression circuit and converting the commercial power supply into a DC voltage, and a conversion circuit for the conversion circuit. An inverter circuit for converting the output to an AC voltage, a bypass means provided in parallel with the inverter circuit for directly outputting the commercial power source, and a switching for selecting an output of the inverter circuit or the bypass means. A circuit, a detection circuit that detects that the switching circuit selects the output of the inverter circuit, and a detection circuit that detects that the switching circuit selects the output of the inverter circuit. ,
A signal generation circuit that outputs a control signal for stopping the harmonic suppression function on the load side and an output from either the inverter circuit or the bypass means selected by the switching circuit are operated to operate internally and At least one device having a harmonic suppression circuit that suppresses a wave component, and configured to stop the operation of the harmonic suppression circuit when the control signal is output from the signal generation circuit. When the inverter circuit on the power supply side is supplying power to the equipment on the load side, the control signal is output to stop the operation of the harmonic suppression circuit in the equipment. Harmonic suppression system characterized by 2. A harmonic suppression circuit that receives a commercial power supply and suppresses a harmonic component thereof, a conversion circuit that receives the output of the harmonic suppression circuit, and that converts the commercial power supply into a DC voltage, and a conversion circuit of the conversion circuit. An energy supply circuit provided on the output side, an inverter circuit for converting the output of the conversion circuit or the output of the energy supply circuit into an AC voltage, and provided in parallel with the inverter circuit to directly output the commercial power supply. A bypass circuit for selecting the output of the inverter circuit or the bypass circuit, a power failure detection circuit for detecting a power failure state of the commercial power source, and the switching circuit selecting the output of the inverter circuit. When the power failure detection circuit detects the power failure status of the commercial power supply, the harmonic suppression function on the load side is stopped. A signal generation circuit for outputting a control signal for causing the control circuit to operate, and a harmonic suppression circuit that operates by receiving the output of either the inverter circuit or the bypass means selected by the switching circuit and internally suppresses a harmonic component. And at least one device configured to stop the operation of the harmonic suppression circuit when the control signal is output from the signal generation circuit. When power is supplied from the circuit to the load side device, the operation of the harmonic suppression circuit in the device is detected by detecting the power failure state of the commercial power supply and outputting the control signal. Harmonic suppression system characterized by being stopped. 3. A harmonic suppression circuit for receiving a commercial power supply and suppressing a harmonic component thereof, a conversion circuit for receiving the output of the harmonic suppression circuit and converting the commercial power supply into a DC voltage, and a conversion circuit of the conversion circuit. An energy supply circuit provided on the output side, an inverter circuit for converting the output of the conversion circuit or the output of the energy supply circuit into an AC voltage, and provided in parallel with the inverter circuit to directly output the commercial power supply. A bypass circuit for selecting the output of either the inverter circuit or the bypass circuit, a discharge detection circuit for detecting that the energy supply circuit is in a discharge state, and the discharge detection circuit for the energy Signal generation that outputs a control signal to stop the harmonic suppression function on the load side when the discharge state of the supply circuit is detected Circuit and a harmonic suppression circuit that operates by receiving the output of either the inverter circuit or the bypass means selected by the switching circuit and that suppresses a harmonic component internally. At least one device configured to stop the operation of the harmonic suppression circuit when a control signal is output, and from the inverter circuit on the power supply side to the device on the load side. When power is supplied, the discharge state of the energy supply circuit is detected and the control signal is output, so that the operation of the harmonic suppression circuit in the device is stopped. Harmonic suppression system. 4. A charger that receives a commercial power source, an energy supply circuit provided on the output side of the charger, and an inverter circuit that converts the output of the charger or the output of the energy supply circuit into an AC voltage. Bypass means provided in parallel with the inverter circuit for directly outputting the commercial power source, a switching circuit for selecting the output of the inverter circuit or the bypass means, and the switching circuit by the detection circuit. When it is detected that the output of the inverter circuit is selected,
A signal generation circuit that outputs a control signal for stopping the harmonic suppression function on the load side, and either the inverter circuit selected by the switching circuit or the output of the bypass means operates to operate, and the internal harmonic At least one device having a harmonic suppression circuit that suppresses a wave component and configured to stop the operation of the harmonic suppression circuit when the control signal is output from the signal generation circuit. When the inverter circuit on the power supply side is supplying power to the equipment on the load side, the control signal is output to stop the operation of the harmonic suppression circuit in the equipment. Harmonic suppression system characterized by 5. A charger that receives a commercial power source, an energy supply circuit provided on the output side of the charger, an inverter circuit that converts the output of the charger or the output of the energy supply circuit into an AC voltage, Bypass means provided in parallel with the inverter circuit for directly outputting the commercial power source, a switching circuit for selecting the output of the inverter circuit or the bypass means, and the energy supply circuit are in a discharge state. A discharge detection circuit for detecting that there is a signal generation circuit for outputting a control signal for stopping the harmonic suppression function on the load side when the discharge state of the energy supply circuit is detected by the discharge detection circuit; Operating by receiving the output of either the inverter circuit or the bypass means selected by the switching circuit At least one device having a harmonic suppression circuit for suppressing a harmonic component therein and configured to stop the operation of the harmonic suppression circuit when the control signal is output from the signal generation circuit. And outputting the control signal by detecting the discharge state of the energy supply circuit when power is supplied from the inverter circuit on the power supply side to the equipment on the load side. A harmonic suppression system characterized in that the operation of the harmonic suppression circuit in the device is stopped. 6. An active filter provided on the commercial power source side, a current transformer for detecting a current flowing from the commercial power source to the load side, and a harmonic component of the current detected by the current transformer. An active filter configured to inject harmonics of opposite phase in order to reduce the noise, and a signal generation circuit that is built in this active filter and that outputs a control signal for stopping the harmonic suppression function on the load side. , Which operates by receiving the commercial power source and internally has a harmonic suppression circuit for suppressing harmonic components, and stops the operation of the harmonic suppression circuit when the control signal is output from the signal generation circuit. And at least one device configured as described above, and when the active filter on the power supply side is operating, the control signal causes the control to be performed on the load side. Harmonic suppression system characterized in that as allowed to stop the operation of the harmonic suppression circuit. 7. A distributed power supply system comprising a distributed power supply device having a harmonic suppressing circuit for supplying a self-generated power supply to the device through a path different from the commercial power supply and suppressing a harmonic component therein. When the active filter on the power supply side is operating, the control signal causes the operation of the harmonic suppression circuit in the device on the load side as well as the operation of the harmonic suppression circuit in the distributed power supply device to stop. The harmonic suppression system according to claim 6, wherein 8. An active filter provided on the commercial power source side, a current transformer for detecting a current flowing from the commercial power source to the load side, and a harmonic component of the current detected by the current transformer. Active filter configured to inject harmonics of opposite phase in order to reduce the noise, and detect the level of the above-mentioned harmonic component, and if the level exceeds a specified value, suppress harmonics on the load side. A control means for outputting a control signal for stopping the power supply, and a harmonic suppression circuit that operates by receiving the commercial power source and suppresses a harmonic component, and the control signal is output from the signal generation circuit. And at least one device configured to stop the operation of the harmonic suppression circuit, the harmonic component when the active filter on the power supply side is operating. Harmonic suppression system characterized in that as allowed to stop the operation of the harmonic suppression circuit on the load side in the apparatus by the control signal according to the level. 9. A distributed power supply system comprising a distributed power supply device having a harmonic suppressing circuit for supplying a self-generated power supply to the device through a path different from the commercial power supply and internally suppressing a harmonic component, When the active filter on the power supply side is operating, along with the operation of the harmonic suppression circuit in the device on the load side by the control signal according to the level of the harmonic component, the above in the distributed power supply device. 9. The harmonic suppression system according to claim 8, wherein the operation of the harmonic suppression circuit is also stopped. 10. A power supply device that receives a commercial power supply and supplies an alternating voltage having a frequency different from that of the commercial power supply, and operates by receiving a power supply supplied by the power supply device,
At least one device having a harmonic suppression circuit for suppressing a harmonic component therein, and a frequency determination circuit provided in the device for determining the frequency of the input power supply, the frequency of the input power supply to the device. Is a frequency peculiar to the power supply device, the operation of the harmonic suppression circuit is stopped through the frequency determination circuit. 11. A harmonic suppression circuit which operates by receiving a commercial power source and suppresses a harmonic component therein.
Device and a frequency judgment circuit provided in the device for judging the frequency of the input power supply. When the frequency of the input power supply for the device is the frequency of the commercial power supply, the frequency judgment circuit is used. A harmonic suppression system characterized in that the harmonic suppression circuit is operated. 12. A power supply device which receives a commercial power supply and supplies an alternating voltage having a voltage value different from that of the commercial power supply, and which operates by receiving a power supply supplied by the power supply device,
At least one device having a harmonic suppression circuit for suppressing a harmonic component therein, and a voltage determination circuit provided in the device for determining the voltage value of the input power supply, are provided. A harmonic suppression system characterized in that when the voltage value is a voltage value specific to the power supply device, the operation of the harmonic suppression circuit is stopped through the voltage determination circuit. 13. A harmonic suppression circuit which operates by receiving commercial power and suppresses a harmonic component inside.
Device and a voltage determination circuit provided in the device for determining the voltage value of the input power source, and when the voltage value of the input power source for the device is the voltage value of the commercial power source, the above voltage A harmonic suppression system, wherein the harmonic suppression circuit is operated through a determination circuit. 14. A power supply device which receives a commercial power supply and supplies an alternating voltage having a waveform different from that of the commercial power supply, and which operates by receiving the power supply supplied by the power supply device.
At least one device having a harmonic suppression circuit for suppressing a harmonic component therein, and a waveform determination circuit provided in the device for determining the voltage waveform of the input power supply, are provided. A harmonic suppression system characterized in that, when the voltage waveform is a voltage waveform specific to the power supply device, the operation of the harmonic suppression circuit is stopped through the waveform determination circuit. 15. A harmonic suppression circuit, which operates by receiving commercial power and suppresses harmonic components, at least 1.
Device and a waveform judgment circuit provided in the device for judging the voltage waveform of the input power supply, and when the voltage waveform of the input power supply to the device is the voltage waveform of the commercial power supply, the waveform A harmonic suppression system, wherein the harmonic suppression circuit is operated through a determination circuit. 16. A power supply device which receives a commercial power supply and supplies an AC voltage in which a frequency of the commercial power supply is subjected to a predetermined jitter, and which operates by receiving a power supply supplied by the power supply device,
At least one device having a harmonic suppression circuit for suppressing a harmonic component therein, and a jitter detection circuit provided in the device for detecting jitter included in the frequency of the input power source are provided. A harmonic suppression system characterized in that, when the frequency of an input power supply contains jitter peculiar to the power supply device, the operation of the harmonic suppression circuit is stopped through the jitter detection circuit. 17. A harmonic suppression circuit which operates by receiving commercial power and suppresses a harmonic component inside.
Device and a jitter detection circuit that is provided in this device and detects the jitter included in the frequency of the input power supply. If the frequency of the input power supply to the device does not include jitter, the above waveform A harmonic suppression system, wherein the harmonic suppression circuit is operated through a determination circuit.