JP3384185B2 - Power factor control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION The present invention relates to an AC power system.
AC power by controlling the capacity of the phase advance capacitor
In connection with the power factor control device that controls the power factor of the system to the optimal value,
It relates to its configuration with improved operating performance. [0002] 2. Description of the Related Art In an AC power system, the negative
A loading device is a device that often generates delayed reactive power.
is there. Reactive power value delayed by power consumed by load device
Increases, the power factor of the AC power system decreases,
Line current increases, the voltage drop and power in the line
It is not preferable because the loss amount increases. Because of this,
Generated reactive power to cancel reactive power
Installing a phase-advancing capacitor device in the AC power system
Is commonly done. Delay reactive power value by load device
Varies depending on the operation state of the load device. So
Here, the delay reactive power value exceeds a predetermined set value.
At the time, connect a leading capacitor to the AC power system (input)
And the load is reduced due to the presence of the phase advance capacitor device
The AC power system enters the leading power factor state and the leading reactive power value
If the set value is exceeded, the phase
By disconnecting (disconnecting) the power supply from the AC power grid,
Control so that the power factor of the power system is always maintained at a high value
The power factor control device is combined with the phase advance capacitor device.
Used. [0003] In this way, the change of the power value consumed by the load device is changed.
To maintain the power factor of the AC power system at a high value in response to
Therefore, as phase-advancing capacitor devices,
Multiple or multiple groups connected so that they can be turned on and off
It is common to construct a number of phase-advancing capacitors. this
Automatically filed by the same applicant as a kind of power factor control device
The power factor adjusting device is disclosed in JP-A-6-209524.
It is known. The method disclosed in JP-A-6-20952 is described below.
Among the automatic power factor adjusting devices known from Japanese Patent Publication No.
Based on the above description, a conventional power factor control device will be described. FIG.
Is a block diagram showing such a conventional power factor control device.
FIG. In FIG. 9, reference numeral 9 denotes a detection unit 91;
Operation condition setting unit 92, input condition setting unit 93, calculation unit 94,
Closing / shutdown determining section 95, delay section 96, output control section 97,
Three-phase AC exchange with output relay section 98 and display section 99
Power factor control device for AC power system that supplies electricity
It is. [0004] An input condition setting section 93 inputs an input to a detection section 91.
Voltage and power of the AC power system not shown
The information about the flow that should be input to the power factor controller 9
Is set, and the signal 93a corresponding to the set condition is output.
Circuit device Supply three-phase alternating current electricity
Voltage required to grasp the operating state of AC power system
And the number of information about current
The power system is operating in a balanced or unbalanced state
It depends on what you are making. That is,
In the equilibrium state, one piece of information for each voltage and current of the same phase
And in an unbalanced state, each differs
Information about the voltage and current of the two phases, ie, voltage,
Two pieces of information about the current are required. Input condition setting
The unit 93 responds to this by providing information on voltage and current.
Set whether the number of each is 1 or 2
ing. Also, depending on the voltage value of the AC power system,
Transform the power system voltage using a transformer (not shown)
Thus, it may be necessary to input the data to the power factor control device 9. this
Therefore, the power of the AC power system input to the power factor control device 9 is
The voltage value corresponding to the voltage is, for example, 100 [V] and 2
00 [V], the AC power system
Set the voltage value corresponding to the
ing. Then, the input condition setting unit 93 sets the
The signal 93a is output in accordance with the input condition thus set.
You. [0005] The detecting section 91 is provided with a voltage of the AC power system.
Values and current values, and outputs a signal 91a corresponding to these values.
Circuit device In the detection unit 91, input condition setting
Under the same conditions as those set in section 93,
Captures voltage and current values corresponding to pressure and current values
Will be. In this case, V₁ , V_Two Two
Voltage value and I₁ , I_Two Input the signal about the two currents
Is shown. Note that the current value of the AC power system
Information may be captured via a transformer.
You. A phase advance capacitor device for an AC power system
Each phase-advancing capacitor or phase-advancing capacitor
Group (hereinafter sometimes abbreviated as phase advance capacitor bank)
You. ) Is properly turned on / off by the power factor controller 9.
The target power factor value and light load condition
Operating conditions of AC power system, V₁ , V_Two Metamorphic ratio for
Value, I₁ , I_Two Transformation ratio value for each phase-advancing capacitor bar
Link capacity, delay time to be provided to the delay unit 96, etc.
This information is stored in the arithmetic unit 94,
This needs to be supplied to the determination unit 95. For this reason
The operation condition setting unit 92 is provided in
The condition setting unit 92 sets the above various conditions,
An electric device that outputs a signal 92a corresponding to the set condition
It is. [0007] The operation unit 94 includes signals 91a, 92a, 93
a to the information by the signals 91a, 92a and 93a
Based on active power and reactive power in AC power system
Value or power factor value
Performs calculations and turns on / off the phase advance capacitor bank.
The calculation of the control level to be performed and the operation level
Performs a bell operation and outputs a signal 94a corresponding to the operation result.
Circuit device The closing / cutting determination unit 95 outputs a signal
92a and 94a are input, and information based on the signals 92a and 94a is input.
Of the phase-advancing capacitor to be turned on / off based on the
The determination of the quantity value is performed, and a signal 95a corresponding to the determination result is output.
Circuit device The delay unit 96 receives the signal 95a.
Signal 96a when the signal lasts for a preset time.
Is a circuit device that outputs. Output control section 97 outputs signals 95a and 96a.
Input, and under the condition that the signal 96a is received, the signal 95a
Information on the capacitance value of the phase advance capacitor that should be turned on and off by
Based on each phase-advancing capacitor
A phase-advancing capacitor van with the closest value from within Sabank
And select the particular phase-advanced capacitor bank selected.
A circuit that outputs a command signal 97a for turning on or off
Device. The output control unit 97 calculates the selected capacitance value.
The phase advance capacitor bank that has
If there are, the earliest of these in the past
Disconnect or turn on the advanced capacitor bank
Also has the function of selecting as a target to be blocked. The output relay section 98 is, for example, a
Phase capacitor bank of the sensor device (C in FIG. 9
₁ , C_Two ... C_n It is shown as ) Each
And an output relay (not shown) combined individually
Electrical device. The output relay section 98 outputs a command signal 97
a, and a command signal 97 is output from among the output relays.
Turn on or off a specific output relay corresponding to a
Let it. When the output relay is turned on or off,
Combined phase-advance capacitor bank turned on or off
Will be done. The display unit 99 includes, for example, a display element and
And an electric device having an LED element.
95a and 97a are input. Then the signal 94
a, 95a, 97a, for example,
Current active power value, reactive power value,
Power factor value, etc.
Indicate the operating status and light load
Display by child. Then, the power factor control device 9
Most of the electronic circuit devices that make up
Consists of a digitally controlled system controlled by a processor
Many things have been done. [0010] According to the above-mentioned prior art,
Since the power factor control device is configured as described above,
Capacitance value of phase-advancing capacitor device installed in AC power system
And constantly maintain the power factor value of the AC power system at a high value.
To help you. However, the AC power system
Because of the need to further improve the operating functions,
The power factor control device by
It is impossible to respond to the request
Signal forcibly shuts off the phase advance capacitor device
To meet new driving methods.
You. The present invention has been made in view of the above-mentioned problems of the prior art.
And the purpose of the
A rate control device is provided. [0014] According to the present invention, there is provided the above-mentioned object.
Detects the power factor value or reactive power value of the AC power system,
Based on this detection result, the phase advance capacitor is
Connected to the AC power system or disconnected from the AC power system.
An apparatus for controlling a power factor value of a power system, comprising:
Voltage and current or, if necessary,
Input the transformed voltage and current, and
A detection unit that outputs a signal corresponding to the pressure value and the current value,
Connecting the phase advance capacitor to the AC power system
Set the conditions for disconnecting from the system, and respond to the set conditions.
Operating condition setting section that outputs a signal
Input the signal output from the condition setting section, and
Some or all of the active power, reactive power, and power factor values of
Of the current value of the section and connection of the phase advance capacitor
.Calculation of control level at which disconnection operation should be performed, and
An operation unit that outputs a signal corresponding to the operation result, and operating conditions
Input the signals output from the setting section and the calculation section, and
Judgment of connection / disconnection of capacitor
A start / stop judgment unit that outputs a corresponding signal, and a start / stop
Input the signal output from the disconnection determination unit and
Connects and disconnects phase-advancing capacitors according to the rules.
An output control unit for outputting a command signal to be given, and an output control unit
Input the command signal output from the
Output relay unit for connecting / disconnecting operation, operation unit, input
・ Inputs signals output from the cutoff judgment unit, output control unit, etc.
And a display unit for performing a display operation corresponding to these signals.
Power factor control device equipped with
Signal and the signal corresponding to the presence or absence of this forced cutoff signal
Output the forced cutoff signal input section and the forced cutoff signal input section.
The signal output from the
If it means that the input has been made,
Forced output of command signal to perform forced disconnection operation
Shutdown determination unit, operation condition setting unit, calculation unit, and forced shutdown
Input the signal output from the judgment unit and send it to the output control unit.
Based on the signals output from the operating condition setting section and the calculation section
To determine the connection / disconnection of the phase advance capacitor
A signal corresponding to the result is output, and a forced cutoff judgment unit
When the command signal is output from the
Output a signal to disconnect the
Indicates that the command signal is output from the
Outputs a signal indicating that forced disconnection is in progress
ON / OFF judgment unit, operation unit, forced shutdown judgment unit, ON
・ Inputs signals output from the cutoff judgment unit, output control unit, etc.
And a display unit for performing a display operation corresponding to these signals.
This is achieved by having a configuration including: [0015] According to the present invention, in the power factor control device,
An external forced shut-off signal is input, and the
A forced cut-off signal input unit that outputs a signal corresponding to the presence or absence,
Input the signal output from the forced cutoff signal input section,
When the signal means that the forced cutoff signal has been input
Is the finger that performs the forced disconnection operation of the phase advance capacitor.
Command output unit, a forced cut-off determining unit, an operating condition setting unit,
Input the signal output from the calculation unit and the forced cutoff judgment unit
The operation condition setting unit and the calculation unit
Connect / disconnect the phase advance capacitor based on the output signal
When the release is judged and a signal corresponding to the judgment result is output
In both cases, when a command signal is output from the forced cutoff
Outputs a signal that disconnects all phase-advancing capacitors,
For the display unit, a command signal is sent from the forced cutoff determination unit.
Is output, it indicates that forced disconnection is in progress.
A closing / shutdown determining unit for outputting a meaning signal, a calculating unit,
Whether it is a forced cutoff judgment section, closing / cutoff judgment section, output control section, etc.
Input the signals output from the
And a display unit for performing the display operation,
An external forced shutoff signal is input to the forced shutoff signal input section.
The command signal output from the forced cutoff
All phase capacitors are disconnected and displayed
That all phase-advancing capacitors are being forcibly shut down
Is displayed. [0016] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Will be described. FIG. 1 shows a power factor control according to an embodiment of the present invention.
It is the block circuit diagram which shows the control device. FIG. 2 shows FIG.
The power factor control device according to the present invention shown in FIG.
Is a flowchart explaining the operation mainly of the part
You. FIG. 3 is a flowchart showing the input in the flowchart shown in FIG.
10 is a flowchart of a subroutine related to condition processing.
FIG. 4 is a flowchart showing the operation of the flowchart shown in FIG.
9 is a flowchart of a subroutine related to an on / off process.
You. FIG. 5 shows an example of the input in the flowchart shown in FIG.
9 is a flowchart of a subroutine related to a diagnosis process.
FIG. 6 shows the reverse tide in the flowchart shown in FIG.
It is a flowchart of a subroutine related to flow processing,
FIG. 7 shows the forcible cutoff in the flowchart shown in FIG.
It is a flowchart of the subroutine regarding a process. Figure
1, the power factor control device according to the conventional example shown in FIG.
The same portions are denoted by the same reference numerals, and description thereof will be omitted. What
Note that, in FIG. 1, the reference numerals shown in FIG.
Only the symbols are shown. In FIG. 1 to FIG.
An operation condition setting unit is provided for the power factor control device 9 according to the conventional example.
92, closing / shutdown determining section 95, output control section 97, display section
99, the operating condition setting unit 92A,
When the cutoff determining unit 2, the output control unit 8, and the display unit 11 are used,
A constant on / off determining unit 3, a reverse power flow determining unit 4, an input diagnostic unit
5, forced cutoff signal input section 6, forced cutoff determination section 7, output section
A condition setting unit 81 and an extended output relay unit 82 are additionally provided.
Power factor control device. The operating condition setting section 92A is provided with a force according to the prior art.
The operation condition setting unit 92 provided in the rate control device 9 is
Is output by four digits in this case.
The phase advance capacitor van which the phase advance capacitor device has
The information on the capacitance value of the loop is displayed. So
For example, if the number is "0", it is always blocked.
The meaning of having been set to be in a disconnected state
If the number is "9999", it is always in the ON state
The meaning is set as follows. Of course,
The AC power system in which the power factor control device 1 is installed
And all phase-advancing capacitor vans
There is also a setting condition that always shuts off or closes the
You. The always-on / off discriminating unit 3 includes an operating condition setting unit 92
Input the signal 92Aa output from A and set the operating conditions
Required capacitance value of the phase advance capacitor device set in section 92A
Is within a predetermined range, a specific advance
Signal 3 that always turns on or off the capacitor
a is a circuit device that outputs a. Always on / off discriminator 3 has
The function will be described with reference to FIG. Always on / off discriminator 3
Is used to determine the information of the input signal 92Aa.
First, at step 701, "0"
Judgment is made as to whether there is a set phase advance capacitor bank
If there is a leading capacitor bank set to "0"
In the next step 702, the corresponding phase advance capacitor
Performs command processing to always shut off the bank and outputs signal 3a.
Power. A closing / shutoff determining unit to which the signal 3a is inputted.
2 and later devices,
The link is always shut off (step
703). No phase advance capacitor bank set to "0"
And after the end of step 703, step 7
04, and the phase advance capacitor bar set to “9999”
It is determined whether there is a link, and "9999" is set.
If there is a phase advance capacitor bank, the next step 7
05, always input the corresponding phase advance capacitor bank
And outputs a signal 3a. This signal 3a
Input / output determination unit 2 and the subsequent devices
The normal phase-in capacitor bank is always turned on.
(Step 706). An input provided in the power factor control device 1 according to the present invention.
Since this is related to the description of the force diagnostic unit 5, the force
About the input condition setting unit 93 also provided with the rate control device 9
Further description will be made with reference to FIG. Input condition setting section
93, which will be described later with reference to FIG.
Input to the power factor control device 1 immediately after the power is turned on.
Set the conditions to be set. That is, in FIG.
Step 201 corresponds to the voltage of the AC power system.
It is determined whether the voltage value is 100 [V].
You. The value of this voltage has already been described in the background section.
Thus, there are two types, 100 [V] and 200 [V].
Therefore, the determination in step 201 is “Yes”
If so, go to step 201 and set it to 100 [V].
If "No", the process proceeds to step 203.
Is set to 200 [V]. Next, the routine proceeds to step 204, where the current (current
Pressure may be used). It is determined whether the number of inputs is one or not.
You. The value of this number is one of two as described above.
Therefore, the determination in step 204 is “Ye
s ", go to step 205 to reduce the number of inputs to one.
Set to the corresponding three-phase equilibrium detection, and
Then, proceed to step 206, the three phases corresponding to two inputs
Set to unbalance detection. Then select this setting
The signal 93a corresponding to the input condition is set to the input condition.
It is output from the unit 93. The input diagnosing section 5 outputs from the detecting section 91.
Signal 91a and the signal output from the input condition setting unit 93.
No. 93a is input, the two signals are compared, and
The condition that the input signal is set by the input condition setting unit 93
If it is different from the above, the signal 5a as an abnormal signal is output.
Circuit device. The functions of the input diagnostic unit 5 are shown in FIG.
An explanation will be given with reference to FIG. The input diagnostic unit 5 proceeds to step 901
Then, the state of the input diagnosis function is determined. Input diagnosis
If the function is set to “Stop”, the input diagnosis
Not done. If the input diagnostic function is set to
If not, the process proceeds to step 902, where the signal 91a is
No. 93a is compared with the input diagnostic processing. input
As a result of the diagnosis processing, for example, even if the setting is 100 [V]
However, the input is 200 [V]. 2 input number setting
Regardless, the number of inputs is one. Current or voltage input
Polarity is different. The phase order of the three-phase voltage is reversed
It is. If any abnormalities are found, proceed to the next step.
In step 903, if the input state abnormality is “Yes”
It is determined, and the process proceeds to step 904 to perform the input diagnosis process.
The signal 5a is output.
Operation is continued. Also, in step 902,
If not always, the next step 903
In this case, it is determined that the input state abnormality is "No" and the signal
5a is not output. Note that the input diagnostic unit 5
Overvoltage from AC power system
Can also be used to protect the power factor control device 1 against intrusion of
Has the ability. The reverse power flow judging section 4 outputs the
A reverse power flow occurs in the AC power system based on the
To determine if a reverse power flow is occurring.
Outputs a signal 4a indicating that a tidal current is occurring
It is a circuit device. Here, the reverse power flow is explained using FIG.
I will tell. FIG. 8 is a single-line circuit diagram for explaining the reverse power flow.
is there. 8, the power factor control device shown in FIGS. 1 and 9
The same reference numerals are given to the same parts as those described above, and the description thereof is omitted. In FIG. 8, 90 is a three-phase commercial AC power supply.
901 is a power system for the commercial AC power system 90.
The source device 902 is connected to the commercial AC power system 90
This is a load facility without a power generator. 903 is a power generator
Device 904 in which the device is installed and the power factor control device 1
And load equipment having a phase advance capacitor device 905.
You. The load device 904 transforms the voltage from the commercial AC power system 90.
Load device 904 that receives power supply through switch 904B
A and a power generator 90 connected to the commercial AC power system 90
4C. The phase advance capacitor device 905 has a C₁
~ C_n Consisting of n advance capacitor banks,
Each phase advance capacitor bank C₁ ~ C_n Are connected in series
Switchgear S₁ ~ S_n Through the commercial AC power system
90. Information of commercial AC power system 90
Changes directly with respect to voltage and with respect to current.
When taken into the power factor control device 1 via the generator 906,
Is illustrated. The commercial AC power system 90 having the above configuration and a load
In the device 904, it is consumed by the load device 904A.
Load power consumption P_L Is for normal reverse power flow
In this case, the system supply power supplied from the power supply device 901
P_S And the in-house generated power supplied from the power generation device 904C
P_G And supplied as a sum. However, power generation
Device 904C is connected to commercial AC power system 90
Therefore, the load power consumption P_L Is generated power P_G Less than
If it is done, the in-house generated power P_G And load power consumption P_L
Surplus power P_SR(= P_G -P_L ) Is a commercial exchange
It will flow out to the flowing power system 90. This commercial AC power
Surplus power P flowing into the power system 90_SRIs called reverse tide
Things. If a reverse power flow occurs, the commercial AC power
Even if the power values flowing through the grid 90 are the same,
Of vector of active power supplied from AC power system
It is reversed for the case when it is not reverse power flow,
Therefore, the active power value becomes negative. The functions of the reverse power flow judging section 4 will be described with reference to FIG.
Will be explained. The reverse power flow determining unit 4 determines whether the input signal
No. 94a is judged.
In step 101, the active power value is calculated using the signal 94a.
Whether the AC power system is in reverse power flow
Is determined, and a reverse power flow is occurring (effective power
This is the case when the force value is negative. ) Contains the next step 10
In step 2, a signal that causes the display unit 11 to display a reverse power flow is displayed.
The output process of No. 4a is performed. This signal 4a was input
First, the reverse tide is detected by the input /
Leading capacitor that does not reach the leading power factor even in the flowing state
Calculates the quantity and calculates the value of this value and the
Phase capacitor that should be shut off in order to
Calculate the capacitance value and cut off the phase advance capacitor of this capacitance value
An output process of a shutoff command signal to be performed is performed (step 1).
03). In step 101, a reverse power flow has occurred.
If no (the active power value is positive),
No. 4a is not output. The forced cutoff signal input unit 6 is connected to the power factor control device 1
(Not shown) from outside the timer, not shown, etc.
When an external signal is input, the signal is
No. 6a. By load equipment
Light load conditions for long periods of time, such as nights and holidays.
In such cases, the phase control
There is no need to perform automatic control of the capacitance value of the capacitor.
obtain. For external signals,
Use output signals such as Ima switch and weekly timer.
Can be. The forced cutoff judging section 7 receives the signal 6a as input.
If, for example, the strength of
A circuit device that outputs a command signal 7a for performing control
is there. The function of the forced cutoff determination unit 7 will be described with reference to FIG.
Make a light. In the forced cutoff determining unit 7, first, in step 111
Is determined whether the signal 6a is input.
If the signal 6a is input, the next step
In step 112, the phase advance capacitor bank is forcibly shut off on the display unit 11.
An output process of the signal 7a for displaying an indication of the disconnection state, etc.
Is performed. Make-up / shut-down judgment by inputting this signal 7a
In part 2 and the subsequent devices, for example,
The densa bank cutoff process is performed (step 11).
3). In this way, all of these phase-advanced capacitor bank
Discontinuation is continued during the period when the signal 6a is input.
Is done. In step 111, the signal 6a is input.
If not, the output processing of the signal 7a is not performed. The closing / shutoff determining section 2 is provided with a power factor control of the prior art.
The input / output determination unit 95 of the device 9 is
Operating condition setting unit instead of signal 92a from condition setting unit 92
The signal 92Aa from the terminal 92A is input and
Signal 3a from another unit 3, signal 4 from reverse power flow judging unit 4
a, and a signal 7a from the forced cutoff determination unit 7 is input.
In accordance with these signals.
Make a decision on closing and closing of the
This is a circuit device that outputs a signal 2a. The signal 2a includes
A display signal given to the display unit 11 is also included. The extended output relay unit 82 is a power factor
It has the same configuration as the output relay section 98 included in the control device 9.
Electrical device. However, the extension output relay
Phase-advance capacitor bar connected to an output relay (not shown)
In FIG. 1, C_{n + 1}, C_{n + 2} ... C_m As
It is shown. The output condition setting unit 81 includes an extended output relay
Set the output condition of whether or not to use the
When the relay unit 82 is set to be used, the signal 81a is generated.
It is a circuit device that outputs. The output control unit 8 includes a power factor control device 9 of the related art.
The output control unit 97 provided in the control unit is provided with a closing / cutoff determining unit 9.
5 from the closing / shutdown determination unit 2 in place of the signal 95a from
The signal 2a is input, and the signal 4a from the reverse power flow determination unit 4 is input.
a and a signal 81a from the output condition setting unit 81 are input.
Circuit device. The output control unit 8 outputs a signal
Capacitance of phase advance capacitor to be turned on / off by 2a
Value and the capacity of the phase-advancing capacitor that should be turned on and off at all times
Based on the value information,
Phase capacitor with the closest value from the phase capacitor bank
Select a DENSA bank and select a specific lead capacitor
Turn on or shut off the sabank (including
No. ) Is output. As described above, when the signal 4a is received.
As shown in the figure, the power factor does not
Calculate the capacitance value of the phase capacitor, and
Should be cut off in order to find the difference
Calculate the capacitance value of the leading capacitor, and add this to the command signal 8a.
Include a shutoff command to shut off the phase advance capacitor of the capacitance value
To do. Further, when the signal 81a is received,
Output relay as a phase-advancing capacitor device to be controlled
With the phase-advancing capacitor device connected to
The expansion phase capacitor device connected to the force relay unit 82
Add. Then, in this case, the output control unit 8
Phase-advancing capacitor vans of a bi-phase capacitor device such as
Of the capacitors with the closest value
And apply the selected phase-advanced capacitor bank.
Alternatively, a command signal 8a for shutting off is output. The display unit 11 is provided by a conventional power factor control device 9.
For the display unit 99 provided, from the closing / cutoff determining unit 95
Signal 2 from the closing / shutdown determination unit 2 in place of the signal 95a of
is input and replaced with the signal 97a from the output control unit 97.
The signal 8a from the output control unit 8 is input, and the signal 4a
a, a signal 5a, and an electric device adapted to receive the signal 7a
It is. Thus, the power factor control device 9 of the related art is
The power factor control device 1 according to the invention
Displaying with the display element corresponding to various functions
For the signal 5a, a buzzer or the like may be used if necessary.
To send an alarm. Next, the power factor control device 1 having the above-described configuration will be described.
Will be described with reference to FIG. Power factor control device
When the power is turned on, first, in step 1,
Input conditions are read. In step 2,
The input condition setting unit 93 sets the input condition based on the read input condition.
Of the conditions to be input to the power factor controller 1
Do as you did. Then, in step 3, output
The condition is read. In step 4, read
Judgment is made based on the output conditions
If there is a case, the output condition setting
The signal 81a indicating that the lay section 82 is used is
Output as described. And then step 5
Then, the output control unit 8 executes the extended output reset based on the signal 81a.
Use a phase advance capacitor bank connected to the
The condition setting is performed as described above. As described above, the extended output relay unit 82 is necessary
This is a device that can be used only when
Additional installation is possible. This allows the power factor
The control device 1 has an output relay section when initially installed in the AC power system.
98 only (AC power system side also has output relay section 98
What is necessary is just to install the phase advance capacitor apparatus corresponding to. ),
At a later date, in response to the increase in the load power, the extended output relay unit 8
2 (AC power system side also corresponds to extended output relay unit 82
A phase advance capacitor device will be installed. ) Do
It becomes possible. Step 6 following step 5
In this case, the operation conditions are read. The next step
In step 7, the on / off determining unit 3 and the on / off determining unit 2
And later devices require a specific advance capacitor bank
Is always turned on and off, and
The corresponding display action is performed as described above. This
Of the phase-advancing capacitor installed in the AC power system.
I want to keep at least part of the
Or vice versa, the so-called base capacitor
Properly responds to requests to keep
It becomes possible. In step 8, the detecting section 91 determines whether the input
Under the same conditions as those set in the force condition setting section 93,
Voltage value and current value corresponding to voltage value and current value of power system
And the calculation unit 94 outputs the signal
An operation of outputting the signal 94a is performed. In the following step 9
Indicates that the input diagnosis unit 5 performs the input diagnosis function as described above.
The input diagnosis process is executed under the condition for operating. This
Thereby, the AC power system input to the detection unit 91 has
Signals relating to the voltage value and the current value are input to the input condition setting unit 93.
When the condition is different from the set condition, the display unit 11
Since the alarm action is performed, the detection unit 91 and the like may be burned.
The fear can be eliminated. In the following step 10, reverse power flow determination
Unit 4, closing / shutdown determination unit 2 and the subsequent devices
If there is a tidal current, the corresponding action will be taken
Then, the corresponding display processing is performed as described above.
As a result, when a reverse power flow occurs,
Phase-advanced capacitor with the specified capacitance is connected to the AC power system
Therefore, even when a reverse power flow occurs, the AC power system
It is possible to maintain the power factor value of the system at an appropriate value. Further
In step 11, the forced cutoff judging section 7,
・ The shutoff judging unit 2 and the subsequent devices use strong external
The action corresponding to the control signal is performed, and
A corresponding display action is performed as described above. This
Forcibly leading the phase with an external signal from a timer, etc.
Respond appropriately to requests to shut down
It becomes possible. In the above description of the embodiment, the power factor system
The control device 1 includes a continuous on / off determining unit 3, a reverse power flow determining unit 4,
Diagnostic section 5, forced cutoff signal input section 6, forced cutoff determining section 7,
Output condition setting unit 81 and extended output relay unit 82 integrated
Has been described, but is not limited to this.
For example, only a part of the above-mentioned devices is provided.
It may be. Then, the above-mentioned devices
Operating condition setting for a power factor control device with only a part
Unit, closing / shutdown determination unit, output control unit, display unit, etc.
Functions are limited to those that correspond to devices that have only a part.
It may be held. Not surprisingly,
Power factor control device with only some of the
Operating condition setting section, closing / shutdown determination section, output control
Functions of the display unit and display unit can be used for various devices that are not installed.
You may have at least some of the corresponding features, or
In addition, all functions may be possessed. This
Continuous on / off discriminator 3, reverse power flow discriminator 4, input diagnostics
5, forced cutoff signal input section 6, forced cutoff determination section 7, output section
Out of the case setting unit 81 and the extended output relay unit 82
Even if the power factor control device has only
At the point of time,
For multiple customers with common basic components
Advantages such as cutting can be obtained. In the above description of the embodiment,
Circuit devices such as a closing / cutting determination unit 2 and an output control unit 8 include:
Each has been described as individually formed,
It is not limited to this, for example,
These circuit devices may be appropriately integrated and configured.
And, if necessary, the whole
This can be achieved. [0041] According to the present invention, the above-mentioned problems are solved.
The configuration described in the section for
Forcing the phase-advance capacitor device by an external signal such as an imager
There is an effect that the cutoff can be performed. In addition, an external signal such as a timer
To make it possible to forcibly shut off the phase advance capacitor device.
Functions are independent functions, so the power factor
Can be added as an option to the control device
Noh. This allows multiple customers with different needs
Being able to deal with common basic components
Standardization can be achieved. Also, basic components
In addition, it is easy to install
It is also possible to flexibly respond to changes in grid load conditions.
You.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block circuit diagram showing a power factor control device according to an embodiment of the present invention. FIG. 2 is a block diagram of the power factor control device according to the present invention shown in FIG. [FIG. 3] A flowchart of a subroutine relating to input condition processing in the flowchart shown in FIG. 2. [FIG. 4] A flowchart of a subroutine relating to constant ON / OFF processing in the flowchart shown in FIG. FIG. 6 is a flowchart of a subroutine relating to input diagnosis processing in the flowchart shown in FIG. 2; FIG. 6 is a flowchart of a subroutine relating to reverse power flow processing in the flowchart shown in FIG. 2; FIG. 8 illustrates reverse power flow. FIG. 9 is a block diagram showing a conventional power factor control device. [Description of symbols] 1 Power factor control device 11 Display unit 2 ON / OFF determination unit 3 Always ON / OFF determination unit 4 Reverse power flow determination Unit 5 input diagnosis unit 6 forced cutoff signal input unit 7 forced cutoff determination unit 8 output control unit 81 output condition setting unit 82 extended output relay unit 91 detection unit 92A operating condition setting unit 93 input condition setting unit

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takeshi Sato 1-1-1, Tanabe-Nita, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (56) References JP-A-6-319229 (JP, A) JP-A-60-216726 (JP, A) JP-A-57-132735 (JP, A) JP-A-59-47931 (JP, A) JP-A-56-162934 (JP, A) JP-A-63-124727 (JP, A) JP-A-6-209524 (JP, A) JP-A-58-90031 (JP, U) WO 94/3957 (WO, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) H02J 3/00-5/00

Claims (1)

(57) [Claims] [Claim 1] A power factor value or a reactive power value of an AC power system is detected, and a phase-advancing capacitor is connected to the AC power system based on the detection result. A device for controlling a power factor value of an AC power system by disconnecting the AC power system by inputting the voltage and current of the AC power system or, if necessary, the transformed voltage and current of the AC power system. A detector that outputs signals corresponding to the voltage and current values, and an operation that sets various conditions when connecting or disconnecting the phase-advancing capacitor to and from the AC power system and outputs a signal corresponding to the set conditions Input the signals output from the condition setting unit, the detection unit and the operating condition setting unit, and calculate the current value of some or all of the active power value, reactive power value, and power factor value of the AC power system. , Shinko An operation unit that performs control level operation for connection / disconnection operation of the capacitor and outputs a signal corresponding to the operation result, and inputs signals output from the operation condition setting unit and the operation unit, A connection / disconnection determination unit that performs connection / disconnection determination and outputs a signal corresponding to the determination result, and a signal output from the connection / disconnection determination unit,
An output control unit that outputs a command signal for performing the connection / disconnection operation of the phase-advancing capacitor according to a predetermined rule, and a command signal output from the output control unit is input to perform the connection / disconnection operation of the phase-advance capacitor. In a power factor control apparatus including an output relay unit and a display unit that receives signals output from a calculation unit, a closing / cutoff determination unit, an output control unit, and performs a display operation corresponding to these signals, A forced cutoff signal input section for receiving a forced cutoff signal from the outside and outputting a signal corresponding to the presence or absence of the forced cutoff signal;
Input the signal output from the forced cutoff signal input section, and if this signal indicates that the forced cutoff signal has been input, output a command signal to perform the forced disconnection operation of the phase advance capacitor. Section, operating condition setting section,
Inputs the signals output from the calculation unit and the forced cut-off judgment unit, and judges the connection / disconnection of the phase advance capacitor to the output control unit based on the signals output from the operation condition setting unit and the calculation unit. A signal corresponding to the determination result is output, and when a command signal is output from the forced cutoff determination unit, a signal for disconnecting all the phase advance capacitors is output,
Also, for the display unit, when a command signal is output from the forced cutoff determination unit, a closing / cutoff determination unit that outputs a signal indicating that the forced disconnection operation is being performed, an operation unit,
A power factor control device comprising: a display unit that receives signals output from a forced cutoff determination unit, a closing / cutoff determination unit, an output control unit, etc., and performs a display operation corresponding to these signals. .