JPH0851735A - Power supply - Google Patents

Abstract

PURPOSE:To provide a power supply in which switching can be made at high rate between control functions for operating a power converter as an uninterruptible power supply or as an active filter according to the state of AC commercial power supply. CONSTITUTION:The current control system functioning as an active filter in the control circuit for power supply comprises a pattern operating circuit 60, a charging current operating circuit 70, a current control circuit 20, an amplitude ratio operating circuit 80, multiplier circuits 91, 92, and adder circuits 98, 99. The voltage control system functioning as an uninterruptible power supply comprises an average value detection circuit 30, a voltage control circuit 10, an amplitude ratio operating circuit 85, multiplier circuits 90, 101, and adder circuits 97, 100. The control circuit further comprises a reference waveform circuit 40, a power recovery detection circuit 50, changeover switches 93, 94, 95, 102 and switches 103, 104, 105, 106.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device, and more particularly to a power supply device that operates an active filter function during commercial power supply and operates an uninterruptible power supply device when an AC power supply is abnormal.

[0002]

2. Description of the Related Art There is a power supply device having a configuration shown in FIG. 10 in order to reduce the size, cost, and multifunction of a conversion device. In the power supply device shown in the figure, the converter 5 performs an active filter operation during commercial power supply, charges the storage battery 6 and controls the charging voltage, and supplies power to the load during an abnormal commercial power supply. It is a multi-functional power supply device that operates the device (hereinafter referred to as UPS operation).

This power supply device detects a harmonic current generated by the load 3 during commercial power supply in which the switch 2 is closed and power is supplied to the load 3 by the commercial AC power supply 1, and a compensation current is generated to generate a harmonic current. The control circuit 8 controls the converter 5 so as to perform the active filter operation for compensating the wave current and the operation for charging the storage battery 6 and controlling the charging voltage.

On the other hand, when the commercial AC power source 1 is in an abnormal state such as a power failure, the switch 2 is opened to change the charging voltage of the storage battery 6 to the DC power source E.
The control circuit 8 performs a UPS operation for converting the DC power source Ed into AC power and supplying power to the load 3 by operating the inverter 5 for DC / AC conversion. The controller 5 is configured to control the controller 5.

[0005]

As described above, the control circuit 8 controls the converter 5 so that the multifunctional power supply device operates with the control function according to the state of the commercial AC power supply 1. To do. That is, the active filter operation is performed at the time of commercial power supply, the operation of the uninterruptible power supply is performed at the time of power failure, and the active filter operation is performed when the power is restored again after the power failure.

However, if the switching time of the above functions is long, it becomes impossible to supply stable power to the load during a power failure,
There is a problem that the harmonic current cannot be compensated when the power is restored. As described above, in the above-mentioned multifunctional power supply device, it is an important issue to switch the above functions at high speed in response to a power failure or a power recovery.

The present invention has been made in view of the above circumstances, and has a control function and an active function for operating a power converter (a converter) in an uninterruptible power supply in response to a power failure or power recovery of a commercial AC power supply. An object of the present invention is to provide a multifunctional power supply device capable of switching to a control function for performing a filter operation at high speed and supplying stable power to a load.

[0008]

A power supply device of the present invention charges a storage battery and performs active filter operation during normal operation when the commercial AC power source is connected in parallel with the load and the load is fed from the commercial AC power source. A commercial AC power supply having a power converter that performs an uninterruptible power supply operation so as to supply AC power to a load by using a storage battery as a power supply and a control unit that controls the power converter according to the state of the commercial AC power supply In the power supply device, the control means controls a current control system that controls the power converter so that the power converter performs an active filter operation, and a voltage that controls the power converter to operate the uninterruptible power supply device. Control system,
State detection means for detecting the state of the commercial AC power supply, and signal switching means for switching between the output of the current control system and the output of the voltage control system based on the output of the state detection means and outputting to the power converter. The current control system and the voltage control system are always operated, and when the active filter of the power converter is operating, the operation amount of the voltage control system is corrected according to the change state of the load, and When the uninterruptible power supply is operating, the operation amount of the current control system is corrected according to the change state of the load, and the output of the current control system and the voltage control system is switched according to the state of the commercial AC power supply.

Further, in the power supply device of the present invention, the current control system calculates a compensation current command value from the output voltage and the output current of the power converter, and a compensation current command value calculating means for calculating a compensation current command value. A charging current calculating means for calculating, a charging current command value calculating means for calculating a charging current command value of the storage battery, and a current pattern for calculating a current pattern by adding the charging current command value and the compensation current command value. Comprising a calculating means, a current controlling means for controlling an output current of the power converter according to a current pattern, and a first amplitude ratio calculating means for calculating an amplitude ratio of the current pattern, The control system includes an average value detecting means for calculating an average value of the detected voltage of the power converter, a voltage pattern calculating means for calculating a voltage pattern of the output voltage, and an output voltage controlled according to the voltage pattern. Voltage control means for Serial voltage pattern - and having a second amplitude ratio calculating means for calculating the amplitude ratio of the emissions.

Further, in the power supply device of the present invention, when the control means controls the power converter by a current control system, the voltage control system determines the voltage pattern from the average value of the detected voltages of the power converter. And the amplitude ratio calculated by the second amplitude ratio calculation means for calculating the amplitude ratio of the voltage pattern,
When the operation amount of the voltage control system is corrected and the power converter is controlled by the voltage control system, the current control system calculates the compensation current command value calculated from the output voltage and the output current of the power converter and the charging of the storage battery. The current control system is operated with the amplitude ratio of the current pattern calculated by the first amplitude ratio calculation means for calculating the current pattern by adding the current command values and calculating the amplitude ratio of the current pattern. It is characterized in that the amount is corrected.

[0011]

In the power supply device having the above structure, the signal switching means for switching the modulated wave output signals of the current control system and the voltage control system is the means (PWM circuit) for forming and outputting the drive pulse for operating the power converter. Input the modulated wave signal to U
The modulated wave signal from the voltage control system that performs the PS operation and the modulated wave signal from the current control system that performs the active filter operation are switched according to the state of the commercial AC power supply.

In the current control for performing the active filter operation, the current control system for calculating the manipulated variable for controlling the output current of the power converter (converter) according to the current pattern compensates for the active filter operation. The current pattern obtained by adding the current command value and the charging current command value, and the operation amount that controls the output current of the power converter according to the deviation of the output current of the power converter at that time according to the current pattern. calculate.

When the power supply device is in the UPS operation, the current control system for performing the active filter operation has a current pattern during the active filter operation before switching the control operation and U
The amplitude ratio between the current pattern obtained by adding the charging current command value and the compensation current command value calculated from the output voltage and load current of the power converter during PS operation is calculated, and this amplitude ratio is multiplied by the manipulated variable. , Correct the operation amount of the current control system.

As described above, the operation amount of the current control system is always corrected even during the UPS operation according to the change of the load current, that is, the change of the load, and the operation is performed so that the active filter operation can be dealt with. Therefore, when the commercial AC power is restored and the UPS operation is switched to the active filter operation again, the power is adjusted so that the harmonic current is quickly compensated by the operation amount of the current control system that is corrected according to the load. The converter (converter) can be controlled, and finally the harmonic current can be compensated by the compensation current command value determined by the output voltage of the power converter and the load current after switching to the active filter operation.

On the other hand, in the voltage control for performing the UPS operation, the voltage control system for calculating the manipulated variable for controlling the output voltage of the power converter in accordance with the voltage pattern has a voltage pattern and power consumption during the UPS operation. An operation amount for controlling the output voltage of the power converter according to the voltage pattern is calculated according to the deviation of the output voltage of the converter.

When the power supply device is in the active filter operation, the voltage control system for performing the UPS operation is the average of the voltage pattern in the UPS operation before switching the control operation and the output voltage of the power converter in the active filter operation. The amplitude ratio with the voltage pattern calculated by the value is calculated, and this amplitude ratio is multiplied by the operation amount to correct the operation amount of the voltage control system. In this way, the operation amount of the voltage control system is always corrected even during the active filter operation according to the change of the output voltage of the power converter, that is, the change of the load. Therefore, when the commercial AC power supply fails and the active filter operation is switched to the UPS operation again, the output voltage of the power converter can be controlled at high speed with the operation amount of the voltage control system that has been corrected according to the load. Finally, the output voltage of the power converter can be controlled by the voltage pattern determined by the voltage command value after switching to the UPS operation and the output voltage of the power converter.

As described above, the current control system that performs the active filter operation and the voltage control system that performs the UPS operation are always operated, and during the active filter operation, the operation amount of the voltage control system is corrected according to the change of the load. By correcting the operation amount of the current control system according to the change of the load during the UPS operation, it is possible to quickly cope with the power failure and the power recovery of the commercial AC power source, and the above-mentioned object can be achieved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a power supply device according to the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a control circuit for controlling the multifunctional power supply device shown in FIG.

In FIG. 1, a current control system for performing an active filter operation includes a pattern calculation circuit 60, a charging current calculation circuit 70, a current control circuit 20, an amplitude ratio calculation circuit 80,
It is composed of multiplication circuits 91 and 92 and addition circuits 98 and 99.

The voltage control system for performing the UPS operation includes an average value detection circuit 30, a voltage control circuit 10, and an amplitude ratio calculation circuit 8.
5, multiplication circuits 90 and 101, and addition circuits 97 and 100. Further, the control circuit is a reference waveform circuit 40,
Power failure recovery detection circuit 50, changeover switches 93, 94,
95, 102 and switches 103, 104, 105, 1
Has 06.

Changeover switches 93, 94, 95, 10
The output of 2 is on the side b during commercial power supply for active filter operation, and on the side a during abnormal AC power supply for UPS operation, according to the detection signal of the power failure recovery detection circuit 50 for detecting the state of the commercial AC power supply. Switch. Although not shown, the switches 104 and 105 are turned on during the active filter operation by the detection signal from the power failure recovery detection circuit 50.
03 and 106 are OFF, switch 10 during UPS operation
3 and 106 are turned on, and 104 and 105 are turned off.

The operation of the control system during the operation of the active filter in the embodiment of FIG. 1 of the present invention will be described with reference to FIGS. 2, 3 and 4. 2 is a configuration diagram of a current control system during active filter operation, FIG. 3 is a configuration diagram of a voltage control system during active filter operation, and FIG. 4 is an explanatory diagram showing operation of the voltage control system shown in FIG.

During commercial power supply in which electric power is supplied to the load 3 from the commercial AC power source 1, the changeover switches 93, 94, 9 are used.
The outputs of 5 and 102 are switched to the b side, and the switch 10
4, 105 are turned on and 103, 106 are turned off. Therefore, the current control system that performs the active filter operation has the configuration shown in FIG. 2, and the voltage control system at that time has the configuration shown in FIG.

The converter voltage ei and the load current if are taken into the pattern calculation circuit 60, and the pattern calculation circuit 60 calculates a compensation current command value and outputs it to the addition circuit 98.

The charging current calculation circuit 70 calculates a charging current from the DC voltage command value Edref and the detected charging voltage Ed of the storage battery 6, and outputs it to the multiplication circuit 91. Multiplication circuit 9
In step 1, the reference waveform synchronized with the AC power source output from the reference waveform circuit 40 is multiplied by the charging current, and the calculated charging current command value is output to the adding circuit 98.

The adder circuit 98 adds the compensation current command value and the charging current command value to create a current pattern. The adder circuit 99 calculates the deviation between the current pattern and the detected converter current ii, and outputs it to the current control circuit 20.

In the current control circuit 20, a current control calculation for controlling the converter current ii according to the deviation according to the current pattern, for example, proportional integral control is executed to calculate the manipulated variable and modulate it. It is output to the PWM circuit 15 as a wave signal.

The PWM circuit 15 forms a drive pulse for driving the converter 5 from the modulated wave signal from the current control circuit 20 and the carrier, and outputs it to the converter 5. Therefore, the converter current ii is controlled according to the compensation current command value and the charging current command value, so that the harmonic current of the commercial AC power source can be compensated and the charging voltage of the storage battery can be controlled. At this time, the current control circuit 20 holds one cycle of the current pattern Ipat during the active filter operation.

On the other hand, the voltage control system during the active filter operation has the configuration shown in FIG. The operation of the voltage control system shown in FIG. 3 will be described with reference to FIG. FIG. 4 shows a case where the power conversion device switches from the UPS operation to the active filter operation at time t1. FIG. 4A shows a voltage pattern.
Vpat, a voltage pattern Vfpat input to the amplitude ratio calculation circuit 85 in the same figure (b), and an amplitude ratio calculation circuit 8 in the same figure (c).
The amplitude ratio er calculated in step 5 is shown in FIG.
The operation amount is 0.

When the power converter switches from the UPS operation to the active filter operation at time t1, the voltage control system becomes as shown in FIG. The average value detection circuit 30 calculates the average value of the detected converter voltage ei, and the multiplication circuit 90 multiplies the average value by the reference waveform output from the reference waveform circuit 40 to calculate the voltage pattern Vfpat. , To the amplitude ratio calculation circuit 85.

In the amplitude ratio calculation circuit 85, the voltage control circuit 1
The voltage pattern Vpat before time t1 held by 0 is fetched, and the amplitude ratio er (= Vfpat / Vpat) is calculated from this voltage pattern Vpat and the calculated voltage pattern Vfpat. At this time, the voltage pattern Vfpat calculated from the average value of the converter voltage ei and the reference waveform is held in the amplitude ratio calculation circuit 85 as a voltage pattern Vpat 'used for calculating the amplitude ratio after time t2. I'll do it. In the multiplication circuit 101, the operation amount of the voltage control circuit 10 is multiplied by the amplitude ratio er calculated by the amplitude ratio calculation circuit 85, and the voltage control circuit 1
Output to 0. Therefore, the manipulated variables at times t1 to t2 are corrected by the amplitude ratio er as shown in FIG.

After time t2, the average value of the detected converter voltage ei and the reference waveform are multiplied by the multiplying circuit 90 to calculate the voltage pattern Vfpat ', which is output to the amplitude ratio calculating circuit 85. The amplitude ratio calculation circuit 85 calculates an amplitude ratio er '(= Vfpat' / Vpat ') between the held voltage pattern Vpat' and the calculated voltage pattern Vfpat '. The voltage pattern Vfpat 'at this time is held in the amplitude ratio calculation circuit 85 as the voltage pattern Vpat "used for calculating the amplitude ratio after the time t3.

In the multiplication circuit 101, the manipulated variable and amplitude ratio calculation circuit 85 of the voltage control circuit 10 corrected at times t1 to t2.
It is multiplied by the amplitude ratio er ′ calculated in step 1 and output to the voltage control circuit 10. Therefore, the operation amount at the times t2 to t3 is corrected by the amplitude ratio er 'as shown in FIG. After that, the voltage control system during the active filter operation performs the same control operation as described above to correct the operation amount, and outputs it to the terminal a of the changeover switch 94.

Thus, the change of the converter voltage ei,
That is, the operation amount of the voltage control circuit can be always corrected and output to the terminal a of the changeover switch 94 even during the active filter operation according to the change of the load. Therefore, when the power failure recovery detection circuit 50 detects a power failure, the active filter operation is switched to the UPS operation again, and when the output of the changeover switch 94 is switched to the side a, the voltage control is corrected according to the change in the load. The converter output voltage can be controlled at high speed by the manipulated variable of the circuit 10, and finally the UP
The output voltage of the converter can be controlled by the voltage pattern determined by the voltage command value after switching to the S operation and the converter voltage.

In the control circuit of the power supply device shown in FIG. 1, the operation of each control system during the UPS operation is shown in FIGS.
Will be explained. 5 is a block diagram of the voltage control system during the UPS operation, FIG. 6 is a block diagram of the current control system during the UPS operation, and FIG. 7 is an explanatory diagram showing the operation of the current control system of FIG.

When an abnormality of the commercial AC power supply is detected by the power failure recovery detection circuit 50, the changeover switches 93, 9
The outputs of 4, 95 and 102 are switched to the side a, the switches 103 and 106 are turned on, and the switches 104 and 105 are turned off. Therefore, the voltage control system for performing the UPS operation has the configuration shown in FIG. 5, and the current control system at that time has the configuration shown in FIG.

In FIG. 5, the average value of the converter voltage ei detected by the average value detection circuit 30 is calculated, and the addition circuit 97 is used.
Output to. In the adder circuit 97, the voltage command value Eref0
And the average value calculated by the average value detection circuit 30 is calculated and output to the multiplication circuit 90.

The multiplication circuit 90 performs multiplication with the reference waveform synchronized with the AC power source output from the reference waveform circuit 40,
Create a voltage pattern.

The adder circuit 100 calculates the deviation between this voltage pattern and the converter voltage ei, and the voltage control circuit 10
Output to. In the voltage control circuit 10, a voltage control calculation for controlling the converter voltage ei according to the deviation according to the voltage pattern, for example, proportional integral control is executed to calculate a manipulated variable, and as a modulated wave signal. Output to the PWM circuit 15.

The PWM circuit 15 forms a drive pulse for driving the converter 5 from the modulated wave signal from the voltage control circuit 10 and the carrier, and outputs it to the converter 5. Therefore, the converter voltage ei is controlled according to the voltage command value, and stable power can be supplied to the load 3 even when the commercial AC power supply is abnormal. At this time, UPS
The voltage control circuit 10 holds one cycle of the voltage pattern Vpat during operation.

On the other hand, the current control system during the UPS operation has the structure shown in FIG. The operation of the current control system of FIG. 6 will be described with reference to FIG. FIG. 7 shows a case where the power conversion device switches from the active filter operation to the UPS operation at time t10. 7A is a current pattern Ipat, FIG. 7B is a current pattern Ifpat input to the amplitude ratio calculation circuit 80, and FIG. 7C is an amplitude ratio er calculated by the amplitude ratio calculation circuit 80. The figure (d) shows the manipulated variable of the current control circuit 20.

When the power converter switches from the active filter operation to the UPS operation at time t10, the current control system causes the converter voltage ei and the load current if to change, as shown in FIG.
To the pattern calculation circuit 60, the pattern calculation circuit 60 calculates the compensation current command value at that time, and the addition circuit 98
Output to.

In the charging current calculation circuit 70, the DC voltage command value E
The charging current is calculated from dref and the charging voltage Ed of the storage battery 6, and is output to the multiplication circuit 91.

The multiplying circuit 91 multiplies the charging current by the reference waveform synchronized with the AC power source output from the reference waveform circuit 40, and outputs the calculated charging current command value to the adding circuit 98.

The adder circuit 98 adds the compensation current command value and the charging current command value to calculate the current pattern Ifpat and inputs it to the amplitude ratio calculation circuit 80.

In the amplitude ratio calculation circuit 80, the current control circuit 2
0 holds the current pattern Ipat before time t10
Current pattern Ipat and calculated current pattern Ipat
The amplitude ratio er (= Ifpat / Ipat) is calculated from the signal Ifpat. At this time, the current pattern Ifpat calculated by adding the compensation current command value and the charging current command value is applied to the amplitude ratio calculation circuit 80 as the current pattern Ifat 'used for calculating the amplitude ratio after time t20. Keep it.

The multiplication circuit 92 multiplies the operation amount of the current control circuit 20 by the amplitude ratio er calculated by the amplitude ratio calculation circuit 80, and outputs it to the current control circuit 20. Therefore, the manipulated variables at times t10 to t20 are corrected by the amplitude ratio er as shown in FIG.

After time t20, the adder circuit 98 adds the compensation current command value and the charging current command value to calculate Ifpat 'and outputs it to the amplitude ratio calculation circuit 80. Amplitude ratio calculation circuit 8
At 0, the amplitude ratio er '(= Ifpat' // of the held current pattern Ipat 'and the calculated current pattern Ifpat'
Ipat ') is calculated. Current pattern Ifpat 'at this time
Is stored in the amplitude ratio calculation circuit 80 as a current pattern Ipat ″ used to calculate the amplitude ratio after time t30.

In the multiplication circuit 92, the manipulated variable of the current control circuit 20 and the amplitude ratio calculation circuit 8 corrected at times t10 to t20.
The multiplication with the amplitude ratio er ′ calculated at 0 is performed, and the result is output to the current control circuit 20. Therefore, the times t20 to t30
The manipulated variable of is corrected by the amplitude ratio er 'as shown in FIG. 7 (d). After that, the current control system during the UPS operation period performs the same control operation as described above to correct the operation amount, and outputs it to the b terminal of the changeover switch 94.

As described above, even in the UPS operation according to the change of the load current if, that is, the change of the load, the operation amount of the current control circuit can be always corrected and output to the terminal b of the changeover switch 94. Therefore, when the power failure recovery detection circuit 50 detects the power recovery, the output of the changeover switch 94 is switched to the terminal b side, and when the UPS operation is switched to the active filter operation again, it is corrected according to the change of the load. The converter current can be controlled at high speed by the operation amount of the current control circuit, and finally the compensation current command value determined by the converter voltage and load current after switching to the active filter operation can compensate the harmonic current. It is also possible to control the charging voltage peak value of the storage battery.

With the above operation, the control circuit of the multi-function power supply device performs the active filter operation, and the current control system U
It is composed of a voltage control system that performs PS operation, both control systems are always operated, the operation amount of the voltage control system is corrected according to the change of the load during the active filter operation, and the operation of the current control system is performed during the UPS operation. A control operation is performed to correct the amount according to the change in load. By correcting the operation amount of the control system with this control operation, it is possible to respond to power failure and power recovery at high speed. That is, when the commercial AC power is restored and the UPS operation is switched to the active filter operation, the harmonic current is quickly compensated by the operation amount of the current control system that is corrected according to the change of the load. The converter can be controlled as follows.

When the commercial AC power supply fails and the active filter operation is switched to the UPS operation, the output of the converter can be output at high speed with the operation amount of the voltage control system which is corrected according to the change of the load. The voltage can be controlled, the power can be supplied to the load, and the functions can be switched in response to a power failure or power recovery of a commercial AC power supply at high speed, and each function can operate.

According to the present invention, the control circuit of the multi-function power supply device is provided with a current control system for performing active filter operation, and UP.
It is composed of a voltage control system that performs S operation, both control systems are always operated, and the operation amount of the voltage control system during the active filter operation and the operation amount of the current control system during the UPS operation according to the load change. By making corrections, it will be possible to respond to power failure and power recovery at high speed.

When the commercial AC power is restored and the UPS operation is switched to the active filter operation, the harmonic current is quickly compensated by the operation amount of the current control system which is corrected according to the change of the load. The converter can be controlled as follows. When the commercial AC power supply fails and the active filter operation is switched to the UPS operation, the output voltage of the converter can be controlled at high speed with the operation amount of the voltage control system that was corrected according to the change of the load. The effect is that stable power can be supplied to the load.

Next, by using a digital arithmetic processing device, as shown in FIG.
Another embodiment of the present invention for realizing the function of the control circuit shown in FIG. 8 will be described with reference to FIGS.

FIG. 8 shows a digital arithmetic processing device comprising an arithmetic processing circuit 200, a pulse generating circuit 201, a memory circuit 202, an input circuit 203 and an output circuit 204.

In the figure, the arithmetic processing circuit 200 is activated by a pulse signal of a pulse generating circuit 201 which is periodically generated, and in accordance with an arithmetic processing procedure stored in a memory circuit 202 in advance, a converter voltage ei and a load current are calculated. if,
The converter current ii and the DC voltage Ed are fetched through the input circuit 203 to perform the arithmetic processing, and the modulated wave signal obtained as the arithmetic processing result is output through the output circuit 204 to the PWM.
Output to the circuit 15.

FIG. 9 shows an arithmetic processing flow executed by the arithmetic processing circuit 200 of FIG. 8. The arithmetic processing of the arithmetic processing circuit 200 is repeatedly executed by the pulse signal of the pulse generating circuit 201.

Processing 205, 206, 20 of the flow of FIG.
7, 208, 209, 210 and 211, input data required for control in process 205, ei, if, ii,
Ed is taken in, and it is determined in step 211 whether or not there is a power failure. If there is no power failure, the processing for realizing the control operation described in FIG. 2, FIG. 3, and FIG. The modulated wave signal is output.

On the other hand, in the case of a power failure, the processing for realizing the control operation described in FIGS. 5, 6 and 7 is executed in processing 208 and 209, and the modulated wave signal obtained by the arithmetic processing is output. Similar effects can be obtained in the above embodiments.

[0061]

According to the present invention, a current control system for performing an active filter operation on a control circuit of a multifunctional power supply device,
It is composed of a voltage control system that performs UPS operation, both control systems are always operated, and the operation amount of the voltage control system during the active filter operation and the operation amount of the current control system during the UPS operation according to the load change. By the correction, the functions can be switched at high speed at the time of power failure and power recovery, and there is an effect that each function can operate.

That is, when the commercial AC power supply recovers after a power failure and switches from the UPS operation to the active filter operation, the harmonics are quickly generated with the operation amount of the current control system which is corrected according to the change of the load. The converter can be controlled to compensate for the current.

Further, when the commercial AC power supply fails and the active filter operation is switched to the UPS operation, the output voltage of the converter is rapidly changed by the operation amount of the voltage control system which is corrected according to the change of the load. Can be controlled, and stable power can be supplied to the load.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a control circuit of a power supply device according to the present invention.

FIG. 2 is a block diagram showing a configuration of a current control system during an active filter operation in the control circuit shown in FIG.

3 is a block diagram showing the configuration of a voltage control system during active filter operation in the control circuit shown in FIG.

FIG. 4 is a waveform diagram showing an operating state of the voltage control system shown in FIG.

5 is a block diagram showing a configuration of a voltage control system when the uninterruptible power supply device is operating in the control circuit shown in FIG.

6 is a block diagram showing a configuration of a current control system when the uninterruptible power supply device is operating in the control circuit shown in FIG.

7 is a waveform diagram showing an operating state of the current control system shown in FIG.

FIG. 8 is a block diagram showing the configuration of another embodiment of the control circuit in the power supply device according to the present invention.

9 is a flowchart showing the processing contents of the control circuit shown in FIG.

FIG. 10 is a block diagram showing a configuration of a power supply device to which the present invention is applied.

[Explanation of symbols]

 1 Commercial AC Power Supply 2 Switch 3 Load 4 Power Converter 5 Converter 6 Storage Battery 7 Harmonic Filter 8 Control Circuit 10 Voltage Control Circuit 15 PWM Circuit 20 Current Control Circuit 30 Average Value Detection Circuit 40 Reference Waveform Circuit 50 Power Failure Recovery Detection circuit 60 Pattern arithmetic circuit 70 Charging current arithmetic circuit 80 Amplitude ratio arithmetic circuit 85 Amplitude ratio arithmetic circuit 90 Multiplier circuit 91 Multiplier circuit 92 Multiplier circuit 101 Multiplier circuit 93 Changeover switch 94 Changeover switch 95 Changeover switch 102 Changeover switch 97 Adder circuit 98 adder circuit 99 adder circuit 100 adder circuit 103 switch 104 switch 105 switch 106 switch

Claims (3)

[Claims] 1. A storage battery is charged in parallel with the load connected to the commercial AC power supply in parallel with the load and the active filter operates during normal operation, and the load is used as the power supply when the commercial AC power supply fails. In a power supply device having a power converter that performs an uninterruptible power supply operation so as to supply AC power to the power converter and a control unit that controls the power converter according to the state of a commercial AC power supply, the control unit is the power A current control system that controls the power converter so that the converter performs an active filter operation, a voltage control system that controls the power converter to operate the uninterruptible power supply, and a state of the commercial AC power supply. The state detecting means for detecting, and the output of the current control system and the output of the voltage control system are switched based on the output of the state detecting means and output to the power converter. And a signal switching unit for operating the current control system and the voltage control system at all times, and correcting the operation amount of the voltage control system according to the change state of the load during active filter operation of the power converter, and When the uninterruptible power supply of the power converter is operating, the operation amount of the current control system is corrected according to the change state of the load, and the output of the current control system and the voltage control system is switched according to the state of the commercial AC power supply. Characteristic power supply device. 2. The current control system, a compensation current command value calculation means for calculating a compensation current command value from an output voltage and an output current of the power converter, and a charging current calculation means for calculating a charging current of the storage battery. A charging current command value calculating means for calculating a charging current command value for the storage battery; a current pattern calculating means for calculating a current pattern by adding the charging current command value and the compensation current command value; The voltage control system has a current control means for controlling an output current of the converter according to a current pattern and a first amplitude ratio calculation means for calculating an amplitude ratio of the current pattern, and the voltage control system has the electric power. An average value detecting means for calculating the average value of the detected voltage of the converter, a voltage pattern calculating means for calculating the voltage pattern of the output voltage, a voltage control means for controlling the output voltage according to the voltage pattern, The voltage pattern
2. The power supply device according to claim 1, further comprising a second amplitude ratio calculation unit that calculates an amplitude ratio of the power supply. 3. The control means, when the power converter is controlled by a current control system, the voltage control system calculates a voltage pattern from an average value of detected voltages of the power converter,
When the operation amount of the voltage control system is corrected by the amplitude ratio calculated by the second amplitude ratio calculation means for calculating the amplitude ratio of the voltage pattern, and the power converter is controlled by the voltage control system,
The current control system calculates the current pattern by adding the compensation current command value calculated from the output voltage and output current of the power converter and the charging current command value of the storage battery, and calculates the amplitude ratio of the current pattern. 3. The power supply device according to claim 2, wherein the operation amount of the current control system is corrected by the amplitude ratio of the current pattern calculated by the first amplitude ratio calculating means.