JP4476216B2 - Automatic power factor adjustment device - Google Patents

Description

  The present invention relates to an automatic power factor adjusting device that detects active power and reactive power of an electric circuit and controls a power factor adjusting capacitor.

  A conventional automatic power factor adjusting device is disclosed in, for example, Japanese Patent Laid-Open No. 5-341863. In this conventional automatic power factor adjustment device, a power factor adjusting capacitor is provided in three zones: an input zone where the reactive power is smaller than the input level, a cutoff zone where the reactive power is higher than the cutoff level, and an intermediate zone between them. A display unit for turning on or off and displaying the power factor is provided. If reactive power is in the input zone, the power factor adjustment capacitor is turned on. If it is in the cutoff zone, the power factor adjustment capacitor is turned off. If it is in the intermediate zone, the power factor adjustment capacitor is turned on or off. Not. The display unit is configured to display the current power factor.

JP-A-5-341863

  The conventional power factor automatic adjustment device has an intermediate zone in which the power factor adjusting capacitor is not turned on or off, and the reactive power is below the cutoff level of the power factor adjusting capacitor, and the intermediate zone on the leading power factor side In this case, the power factor automatic adjusting device does not block the power factor adjusting capacitor, but in this case, there is a problem that the device is erroneously determined to be abnormal. In this case, when the power factor adjustment capacitor is shut off, the power factor falls below the target power factor and the reactive power becomes lower than the power factor adjustment capacitor input level. Do not shut off the capacitor. Such a situation where the power factor automatic adjustment device is erroneously determined to be abnormal can be avoided, for example, by manually shutting off the power factor adjusting capacitor and checking the power factor after the shut-off. When the adjustment capacitor is cut off, the power factor is temporarily deteriorated because the power factor adjustment capacitor cannot be turned on again during the discharge time of the capacitor. For this reason, the method of shutting off the power factor adjusting capacitor by manual operation and checking the power factor after the shut-off cannot be adopted.

  In the case where an abnormality of the power factor automatic adjustment device is assumed, the present invention does not actually shut off the power factor adjusting capacitor by manual operation or before actually shutting off the power factor adjusting capacitor by manual operation. The present invention proposes an automatic power factor adjustment device capable of displaying a predicted power factor when a certain control is performed.

The power factor automatic adjusting device according to the first aspect of the present invention is a power factor automatic adjusting device that automatically adjusts the power factor of an electric circuit using a plurality of power factor adjusting capacitors,
Active power calculating means for calculating the active power of the electric circuit;
Reactive power calculation means for calculating reactive power of the electric circuit,
Current power factor calculation means for calculating a current power factor based on the active power and the reactive power;
Setting means for setting a control mode including a target power factor, a capacitor capacity of the plurality of power factor adjusting capacitors, and a turn-on order and a shut-off order of the plurality of power factor adjusting capacitors;
Based on the capacitor capacity of the plurality of power factor adjustment capacitors and the control mode, among the plurality of power factor adjustment capacitors, a capacitor to be charged next, a capacitor to be blocked next to be cut off, And a next control capacitor selecting means for selecting a capacitor capacity of the capacitor to be interrupted, calculating a charging level for the capacitor to be charged based on the active power and the target power factor, and An on / off level calculating means for calculating a cutoff level for the cutoff target capacitor based on active power, the target power factor, and a capacitor capacity of the cutoff target capacitor;
Determining whether the reactive power is in an intermediate zone divided between the input level and the cut-off level, an input zone smaller than the intermediate zone, or a cut-off zone larger than the intermediate zone; When reactive power is in the input zone, an input signal for the input capacitor is generated, and when the reactive power is in the cutoff zone, an interruption signal for the interruption target capacitor is generated, and the reactive power is generated. Is in the intermediate zone, the closing shut-off determination means that does not generate the closing signal and the shut-off signal,
Based on the input signal and the cutoff signal, the current on / off state of the plurality of power factor adjusting capacitors is stored, and the current on / off state of the plurality of power factor adjusting capacitors is output to the next control capacitor selecting means. Control state storage means for
More determination result of the making and breaking determining means, when said and said reactive power when the reactive power is in the intermediate zone is in the blocking zone, and the active power, and the reactive power, the capacitor of the blocking target capacitor It is characterized by comprising a predicted power factor calculating means for calculating a predicted shutoff power factor when the shutoff target capacitor is shut off based on a capacity, and a predicted value display means for displaying the predicted shutoff power factor.

A power factor automatic control device according to a second aspect of the present invention is a power factor automatic adjustment device that automatically adjusts the power factor of an electric circuit using a plurality of power factor adjustment capacitors,
Active power calculating means for calculating the active power of the electric circuit;
Reactive power calculation means for calculating reactive power of the electric circuit,
Current power factor calculation means for calculating a current power factor based on the active power and the reactive power;
And the target power factor, and capacitance of the plurality of power factor correction capacitors, setting means for setting a control mode including interrupting the sequence and the input sequence of said plurality of power factor correction capacitors,
Based on the capacitor capacity of the plurality of power factor adjustment capacitors and the control mode, among the plurality of power factor adjustment capacitors, a capacitor to be charged next, a capacitor to be blocked next to be cut off, And a next control capacitor selecting means for selecting a capacitor capacity of the capacitor to be cut off,
Based on the active power and the target power factor, the charging level for the capacitor to be charged is calculated, and at the same time, based on the active power, the target power factor, and the capacitor capacity of the capacitor to be blocked, the cutoff Input cutoff level calculation means for calculating the cutoff level for the target capacitor,
Determining whether the reactive power is in an intermediate zone divided between the input level and the cut-off level, an input zone smaller than the intermediate zone, or a cut-off zone larger than the intermediate zone; When reactive power is in the input zone, an input signal for the input capacitor is generated, and when the reactive power is in the cutoff zone, an interruption signal for the interruption target capacitor is generated, and the reactive power is generated. Is in the intermediate zone, the closing shut-off determination means that does not generate the closing signal and the shut-off signal,
Based on the input signal and the cutoff signal, the current on / off state of the plurality of power factor adjusting capacitors is stored, and the current on / off state of the plurality of power factor adjusting capacitors is output to the next control capacitor selecting means. Control state storage means for
Virtual control state setting means for setting a virtual on / off state different from the current on / off state for the plurality of power factor adjusting capacitors,
Based on the reactive power, the current on / off state of the plurality of power factor adjusting capacitors stored in the control state storage means, and the virtual on / off state set by the virtual control setting means, the plurality of forces Predictive reactive power calculating means for calculating virtual control predicted reactive power when the rate adjusting capacitor is in the virtual on / off state,
Based on the active power and the virtual control prediction reactive power, a prediction power factor calculation means for calculating a virtual control prediction power factor when the plurality of power factor adjustment capacitors are in the virtual on / off state, and A predicted value display means for displaying the virtual control predicted power factor calculated by the predicted power factor calculating means is provided.

A power factor automatic control device according to a third aspect of the present invention is a power factor automatic adjustment device that automatically adjusts the power factor of an electric circuit using a plurality of power factor adjustment capacitors,
Active power calculating means for calculating the active power of the electric circuit;
Reactive power calculation means for calculating reactive power of the electric circuit,
Current power factor calculation means for calculating a current power factor based on the active power and the reactive power;
Setting means for setting a control mode including a target power factor, a capacitor capacity of the plurality of power factor adjusting capacitors, and a turn-on order and a shut-off order of the plurality of power factor adjusting capacitors;
Based on the capacitor capacity of the plurality of power factor adjustment capacitors and the control mode, a capacitor to be charged next to be turned on and a capacitor to be cut off to be cut off next are selected among the plurality of power factor adjustment capacitors. A next control capacitor selecting means for selecting, and also selecting a capacitor capacity of the capacitor to be cut off,
Based on the active power and the target power factor, the charging level for the capacitor to be charged is calculated, and at the same time, based on the active power, the target power factor, and the capacitor capacity of the capacitor to be blocked, the cutoff Input cutoff level calculation means for calculating the cutoff level for the target capacitor,
Determining whether the reactive power is in an intermediate zone divided between the input level and the cut-off level, an input zone smaller than the intermediate zone, or a cut-off zone larger than the intermediate zone; When reactive power is in the input zone, an input signal for the input capacitor is generated, and when the reactive power is in the cutoff zone, an interruption signal for the interruption target capacitor is generated, and the reactive power is generated. Is in the intermediate zone, the closing shut-off determination means that does not generate the closing signal and the shut-off signal,
Manual operation means for performing a shut-off operation with respect to one manual shut-off target capacitor of the power factor adjusting capacitor in the input state among the plurality of power factor adjusting capacitors;
Manual operation capacitor capacity selection means for selecting a capacitor capacity of the manual cutoff target capacitor based on the cutoff operation by the manual operation means,
Predictive power factor calculating means for calculating a manual shutoff predicted power factor when the manual shutoff target capacitor is shut off based on the active power, the reactive power, and the capacitor capacity of the manual shutoff target capacitor;
The absolute value of the current power factor calculated by the current power ratio calculating means, wherein when the predicted power factor is less than the absolute value of the computed manually blocked predictive power rate calculating means, manually for the manual blocking target capacitor When the absolute value of the current power factor is larger than the absolute value of the predicted manual power factor, an alarm signal is output and the manual operation means is output within a certain time. Manual operation determining means for outputting a manual cutoff signal for the manual cutoff target capacitor even when the cutoff operation is performed again by
Based on the input signal, the cutoff signal, and the manual cutoff signal, the current on / off state of the plurality of power factor adjustment capacitors is stored, and the current power of the plurality of power factor adjustment capacitors is stored in the next control capacitor selection means. Control state storage means for outputting the shut-off state of
An alarm unit that generates an alarm output based on an alarm signal output from the manual operation determination unit, and a predicted value display unit that displays a manual shutoff predicted power factor calculated by the predicted power factor calculation unit are provided. And

A power factor automatic adjusting device according to a fourth aspect of the present invention is a power factor automatic adjusting device that automatically adjusts the power factor of an electric circuit using a plurality of power factor adjusting capacitors.
Active power calculating means for calculating the active power of the electric circuit;
Reactive power calculation means for calculating reactive power of the electric circuit,
Current power factor calculation means for calculating a current power factor based on the active power and the reactive power;
And the target power factor, and capacitor capacity of said plurality of power factor correction capacitors, setting means for setting a control mode including interrupting the sequence and the input sequence of said plurality of power factor correction capacitors,
Assuming that a plurality of virtual capacitors having a capacitor capacity different from the capacitor capacity of the plurality of power factor adjustment capacitors are installed in the electric circuit instead of the plurality of power factor adjustment capacitors, the plurality of Virtual capacitor capacity setting means for setting the capacitor capacity of the virtual capacitor;
Based on the capacitor capacity of the plurality of power factor adjustment capacitors and the control mode, a capacitor to be charged next to be turned on and a capacitor to be cut off to be cut off next are selected among the plurality of power factor adjustment capacitors. Select a capacitor capacity of the capacitor to be shut off, and at the same time, based on the capacitor capacity of the plurality of virtual capacitors and the control mode, a virtual to be input next among the plurality of virtual capacitors A selection capacitor and a virtual cutoff target capacitor to be shut off next, and a next control capacitor selection means for selecting a capacitor capacity of the virtual cutoff target capacitor;
Based on the active power and the target power factor, calculate a charging level for the charging target capacitor and a virtual charging level for the virtual charging target capacitor; and the active power, the target power factor, and the cutoff Based on the capacitor capacity of the target capacitor, a cutoff level for the cutoff target capacitor is calculated. In addition, based on the active power, the target power factor, and the capacitor capacity of the virtual cutoff target capacitor, the virtual cutoff target capacitor is calculated. Input cutoff level calculation means for calculating a virtual cutoff level,
Based on the reactive power, the capacitor capacity of the plurality of power factor adjusting capacitors, and the capacitor capacity of the plurality of virtual capacitors, prediction for calculating virtual capacity prediction reactive power when the virtual capacitor is installed in the electric circuit Reactive power calculation means,
Determining whether the reactive power is in an intermediate zone divided between the input level and the cut-off level, an input zone smaller than the intermediate zone, or a cut-off zone larger than the intermediate zone; When reactive power is in the input zone, an input signal for the input capacitor is generated, and when the reactive power is in the cutoff zone, an interruption signal for the interruption target capacitor is generated, and the reactive power is generated. Is in the intermediate zone, the function that neither the input signal nor the cutoff signal is generated, and the virtual intermediate reactive power is divided between the virtual input level and the virtual cutoff level, Whether it is in a virtual launch zone that is smaller than this virtual intermediate zone or a virtual blocking zone that is larger than the virtual intermediate zone Determining that when the virtual capacity reactive power is in the virtual input zone, a virtual input signal for the virtual input target capacitor; and when the virtual capacity reactive power is in the virtual cutoff zone, An on / off discriminating means for generating a virtual off signal for a capacitor and having a function of not generating the virtual on-off signal and the virtual off-off signal when the virtual reactive power is in the virtual intermediate zone,
Based on the input signal and the cutoff signal, the current on / off state of the plurality of power factor adjusting capacitors is stored, and the current on / off state of the plurality of power factor adjusting capacitors is output to the next control capacitor selecting means. In addition, based on the virtual input signal and the virtual cutoff signal, the current virtual insertion cutoff state of the plurality of virtual capacitors is stored, and the current virtual insertion cutoff of the plurality of virtual capacitors is stored in the next control capacitor selection means. Control state storage means for outputting the state;
Predictive power for calculating a virtual capacity predictive power factor when the plurality of virtual capacitors are installed in the electric circuit instead of the plurality of power factor adjusting capacitors based on the active power and the virtual capacity predictive reactive power A rate calculation unit; and a predicted value display unit that displays the virtual capacity prediction power factor.

  In the power factor automatic adjustment device according to the first aspect of the present invention, the predicted power factor calculation means calculates a cutoff predicted power factor when the cutoff target capacitor is cut off, and the predicted value display means includes: The said interruption | blocking prediction power factor is displayed. Therefore, when the reactive power is lower than the cutoff level Lc of the cutoff target capacitor and is on the advance power factor side, the power factor automatic adjustment device does not cut off the cutoff target capacitor. In this case, since it can be confirmed by the predicted shut-off power factor that it is below the target power factor, it is not determined that the power factor automatic adjustment device is abnormal. In addition, it is possible to confirm the predicted power factor after shutting off the capacitor to be shut down without manually shutting off the capacitor. it can.

  Moreover, in the power factor automatic adjustment device according to the second aspect of the present invention, the predicted power factor calculation means includes a virtual control predictive power when the plurality of power factor adjusting capacitors are in the virtual closing state. The rate is calculated, and the predicted value display means displays the virtual control predicted power factor. Therefore, when the reactive power is lower than the cutoff level Lc of the cutoff target capacitor and is on the advance power factor side, the power factor automatic adjustment device does not cut off the cutoff target capacitor. In this case, since it can be confirmed by the predicted shut-off power factor that it is below the target power factor, it is not determined that the power factor automatic adjustment device is abnormal. In addition, since the power factor adjustment capacitor can confirm the virtual control predicted power factor when the power supply adjustment capacitor enters the virtual closing state without performing manual operation, the power factor adjustment capacitor can be electrically The situation where the power factor of the circuit is deteriorated can also be avoided.

  In the automatic power factor adjustment device according to the third aspect of the present invention, the predicted power factor calculating means calculates a manual shutoff predicted power factor when the manual shutoff target capacitor is shut off, and the predicted value display means. Displays the predicted manual shutoff power factor. Therefore, when an abnormality of the power factor automatic adjustment device is assumed, it is possible to confirm the predicted manual shutoff power factor when the manual shutoff target capacitor is shut off before actually shutting off the manual shutoff target capacitor. Therefore, it is possible to eliminate a situation where the power factor automatic adjustment device is erroneously determined to be abnormal while avoiding a situation where the power factor of the electric circuit is deteriorated due to unnecessary manual operation to cut off the capacitor.

  In the power factor automatic adjustment device according to the fourth aspect of the present invention, the predicted power factor calculation means predicts the virtual capacity when the plurality of virtual capacitors are installed instead of the plurality of power factor adjustment capacitors. The power factor is calculated, and the predicted value display means displays the virtual capacity predicted power factor. Therefore, if an abnormality of the power factor automatic adjustment device is assumed, the virtual capacity prediction power factor when multiple virtual capacitors are installed can be confirmed without manually shutting off the capacitor. Therefore, the situation where the power factor automatic adjustment device is erroneously determined to be abnormal can be solved while avoiding the situation where the power factor of the electric circuit is deteriorated due to the capacitor being manually cut off.

Embodiment 1 FIG.
FIG. 1 is a block circuit diagram showing a first embodiment of the power factor automatic adjusting apparatus according to the present invention. 2A and 2B are flowcharts showing the processing operation of the first embodiment.

The automatic power factor adjusting device of the first embodiment includes an electric circuit 100, a power factor adjusting unit 1, and a power factor adjusting capacitor charging / disconnecting device 50. The electric circuit 100 is an AC circuit. The AC voltage of the electric circuit 100 is, for example, 6600 [V] class, and the AC current is, for example, 200 [A] class. The electric circuit 100 is provided with a measuring transformer 101 and a measuring current transformer 102. The measurement transformer 101 measures the AC voltage of the electric circuit 100 by stepping it down to, for example, 110 [V] class and outputs the AC voltage V. Measuring current transformer 102, the AC current of the electric circuit 100, is measured by flowing reduced, for example, 5 [A] class, and outputs the alternating current I. The AC voltage V and the AC current I are supplied to the power factor adjustment unit 1.

  The power factor adjusting capacitor closing / blocking device 50 is installed in the electric circuit 100 and adjusts the power factor of the electric circuit 100. The power factor adjusting capacitor shut-off device 50 includes a plurality of power factor adjusting capacitors 52a, 52b, 52c,..., A plurality of series reactors 51a, 51b, 51c,. 50a, 50b, 50c,. The power factor adjusting capacitors 52a, 52b, 52c,... Are connected to the electric circuit 100 through series reactors 51a, 51b, 51c,... And electromagnetic contactors 50a, 50b, 50c,. Is done. The electromagnetic contactors 50a, 50b, 50c,... Are turned on and shut off by the power factor adjusting unit 1.

  The power factor adjusting capacitors 52a, 52b, 52c,... Are all configured to have the same capacitor capacity, or are configured to have different capacitor capacities. When the capacitor capacities of the power factor adjusting capacitors 52a, 52b, 52c,... Are all the same, these power factor adjusting capacitors 52a, 52b, 52c,. Are shut off by the magnetic contactors 50a, 50b, 50c,... If the capacitor capacities of the power factor adjusting capacitors 52a, 52b, 52c,... Are different, the power factor adjusting capacitors 52a, 52b, 52c,. Be controlled.

The power factor adjustment protect Marseille knit 1 includes a setting means 2, the effective power computing means 3, the reactive power calculation means 4, the current power factor calculating means 5, the following control capacitor selection unit 6, and power-off level calculating means 7 And an insertion interruption determination unit 8, a control state storage unit 9, a capacitor insertion interruption unit 10, a predicted power factor calculation unit 11, a current value display unit 12, and a predicted value display unit 13. Each of these means is constituted by a computer, for example. The setting unit 2 is configured using a computer register or memory, the control state storage unit 9 is configured using a computer memory, and the capacitor insertion blocking unit 10 is configured using a computer output circuit. The active power calculation means 3, the reactive power calculation means 4, the current power factor calculation means 5, the next control capacitor selection means 6, the on / off level calculation means 7, the on / off determination means 8, and the predicted power factor calculation means 11 are computer CPUs. It is a means performed using. The current value display means 12 and the predicted value display means 13 are configured using a computer display.

The setting means 2 includes a transformer ratio VTr of the measuring transformer 101, a current transformer ratio CTr of the current transformer 102, capacitor numbers of power factor adjusting capacitors 52a, 52b, 52c,. corresponding power factor correction capacitors 51a to, 52 b, 52c, and each of the capacitance of ..., the target power factor cos _T, power factor correction capacitors 52a, 52 b, 52c, supply sequence and blocking ... The control mode including the order is set. When there is a change in these setting values, the setting values are updated as needed.

The active power calculation means 3 includes an AC voltage V output from the measurement transformer 101, an AC current I output from the measurement current transformer 102, a transformation ratio VTr set by the setting means 2, and a current conversion ratio CTr. Based on the above, the active power W is calculated by the following (Equation 1).
W = V × VTr × I × CTr × cos θ (Formula 1)
Is the phase angle between the AC voltage V and the AC current I.

The reactive power calculation means 4 calculates the reactive power VAR according to the following (Equation 2).
VAR = V × VTr × I × CTr × sin θ (Expression 2)

Based on the active power W calculated by the active power calculator 3 and the reactive power VAR calculated by the reactive power calculator 4, the current power factor calculator 5 calculates the current power factor by the following (Equation 3). The present power factor cosΦ is calculated. The current power factor cos Φ is supplied to the current value display means 12 and displayed.
cosΦ = cos {tan ⁻¹ (VAR / W)} (Expression 3)

  The next control capacitor selecting means 6 is configured so that the power factor adjusting capacitors 52a, 52b, 52c,... Set by the setting means 2 at the start of activation of the power factor automatic adjusting apparatus according to the first embodiment, Based on the control mode including the order in which the power factor adjusting capacitors are turned on and the order in which they are shut off, among the power factor adjusting capacitors 52a, 52b, 52c,. Next, the cutoff target capacitor 52n2 to be cut off is selected, and the capacitor capacity Cn1 of the insertion target capacitor 52n1 and the capacitor capacity Cn2 of the cutoff target capacitor 52n2 are selected.

  After the start-up of the power factor automatic adjusting apparatus according to the first embodiment, the next control capacitor selecting unit 6 sets the respective capacitor capacities of the power factor adjusting capacitors 52a, 52b, 52c,. , And the input target capacitor 52n1 to be input next, based on the control mode, and the current power factor adjusting capacitors 52a, 52b, 52c,. The cutoff target capacitor 52n2 is selected, and the capacitor capacitance Cn1 of the insertion target capacitor 52n1 and the capacitor capacitance Cn2 of the cutoff target capacitor 52n2 are selected.

Based on the target power factor cosΦ _T set by the setting unit 2 and the active power W calculated by the active power calculation unit 3, the input cutoff level calculation unit 7 calculates the input level Lj for the input target capacitor 52n1 as follows: Calculation is performed according to (Expression 4).
Lj = − [tan {cos ⁻¹ (cos Φ _T )} × W] (Formula 4)
The unit of the input level Lj is the same [var] as the unit of the reactive power VAR.

Furthermore, making and breaking level calculating means 7, the target power factor cos _T, and active power W, based on the capacitance Cn2 of the blocking target capacitor 52n2 selected in the next control capacitor selection means 6, blockade on blocking target capacitor 52n2 The level Lc is calculated by the following (Formula 5).
Lc = − [tan {cos ⁻¹ (cosΦ _T )} × W] + (Cn2 × a) (Formula 5)
However, when the calculation result of Lc is 0 or smaller than 0, Lc = 0.
In (Expression 5), a is a constant. The unit of the cutoff level Lc is also [var] which is the same as the unit of the reactive power VAR.

  The input / cutoff determination unit 8 receives the input level Lj and the cut-off level Lc from the input / cutoff level calculation unit 7, and has an intermediate zone MDZ whose both ends are divided by the input level Lj and the cut-off level Lc, and the intermediate zone MDZ. Three zones, a smaller input zone ONZ and a cut-off zone OFZ larger than the intermediate zone MDZ, are set, and the reactive power VAR calculated by the reactive power calculation means 4 is one of these zones MDZ, ONZ, OFZ. And the closing signal Sof are generated based on the determination result. Specifically, the intermediate zone MDZ is set to a zone between the input level Lj and the cutoff level Lc and satisfies, for example, Lj <VAR <Lc. The input zone is a zone in which the reactive power VAR is smaller than the intermediate zone MDZ, for example, a zone that satisfies VAR ≦ Lj. The cutoff zone OFZ is a zone in which the reactive power VAR is larger than the intermediate zone MDZ, and is a zone that satisfies, for example, Lc ≦ VAR.

  When the reactive power VAR is in the input zone ONZ, the input / cutoff determination unit 8 generates the input signal Son for the input target capacitor 52n1, and when the reactive power VAR is in the cutoff zone OFZ, the input / cutoff determination unit 8 generates the cutoff signal Sof for the cutoff target capacitor 52n2. appear. However, if the reactive power VAR is in the intermediate zone MDZ, neither the input signal Son nor the cutoff signal Sof is generated.

  Specifically, the input / cutoff determination unit 8 first compares the reactive power VAR from the reactive power calculation unit 4 with the input level Lj calculated by the input cutoff level calculation unit 7, and the comparison result is VAR ≦ In the case of Lj, that is, if the comparison result indicates that the reactive power VAR is present in the input ONZ, the comparison result is output to the predicted power factor calculation means 11 and the input signal Son for the input target capacitor 52n1 is output. On the other hand, if the comparison result between the reactive power VAR and the input level Lj is VAR> Lj, the comparison result is output to the predicted power factor calculating means 11, and subsequently calculated by the reactive power VAR and the input cutoff level calculating means 7. And the comparison result is VAR ≧ Lc, that is, if the comparison result indicates that the reactive power VAR is present in the cutoff zone OFZ, the cutoff signal Sof for the cutoff target capacitor 52n2 is output. . However, if VAR <Lc, the reactive power VAR is present in the intermediate zone MDZ, and therefore the input signal Son and the cutoff signal Sof are not output.

  The control state storage means 9 is based on the input signal Son for the input target capacitor 52n1 and the interruption signal Sof for the interruption target capacitor 52n2 output from the injection interruption determination means 8, and the on / off states of the application target capacitor 52n1 and the interruption target capacitor 52n2. Is updated and stored to store the current on / off states of all power factor adjusting capacitors 52a, 52b, 52c,. The control state storage means 9 further outputs the current on / off state of all the power factor adjusting capacitors 52a, 52b, 52c,. For example, when the charging target capacitor 52n1 is the power factor adjusting capacitor 52a, when the closing signal Son is output to the power factor adjusting capacitor 52a from the closing / cutting determining unit 8, the control state storage unit 9 From the stored power factor adjustment capacitors 52a, 52b, 52c,..., The power factor adjustment capacitor 52a only input / shutoff state is updated and stored, and then stored. Output to the control capacitor selection means 6.

  Capacitor closing / blocking means 10 receives a closing signal Son for closing target capacitor 52n1 and a blocking signal Sof for blocking target capacitor 52n from closing / closing determining means 8, and among the magnetic contactors 50a, 50b, 50c,. Then, the electromagnetic contactor connected to the capacitor 52n1 to be turned on is turned on, and the magnetic contactor connected to the capacitor 52n2 to be cut off is cut off.

Predictive power factor calculating means 11, based on the discrimination result of the making and breaking discriminating means 8, if the reactive power VAR is Ru-on zone near, i.e. when satisfying the VAR ≦ Lj, the effective power of the effective power computing means 3 Based on W, the reactive power VAR from the reactive power calculation means 4, and the capacitor capacity Cn1 of the charging target capacitor 52n1 selected by the next control capacitor selection means 6, if the charging target capacitor 52n1 is turned on The predicted power factor (cosΦ _f 1) is calculated by the following (Equation 6).
cosΦ _f 1 = cos {tan ⁻¹ [VAR + Cn1] / W}} (Expression 6)

Further, the predicted power factor calculation unit 11 is based on the determination result of the on / off determination unit 8 when the reactive power VAR is in the cutoff zone OFZ and when the reactive power VAR is in the intermediate zone MDZ, that is, when VAR> Lj is satisfied. Is based on the active power W, the reactive power VAR, and the capacitor capacity Cn2 of the cutoff target capacitor 52n2, the cutoff predicted power factor cosΦ _f 2 when the cutoff target capacitor 52n2 is temporarily cut off is expressed as Calculate according to 7).
cosΦ _f 2 = cos {tan ⁻¹ [(VAR−Cn2) / W]} (Expression 7)

The predicted predicted power factor calculation means 11 supplies the predicted predicted power factor cosΦ _f 1 calculated based on (Equation 6) and (Expression 7) and the predicted predicted power factor cosΦ _f 2 to the predicted value display means 13. It is displayed by the predicted value display means 13.

In the power factor automatic adjustment apparatus of the first embodiment, the predicted power factor calculation means 11 calculates the predicted shut-off power factor cosΦ _f 2, and the predicted value display means 13 displays the predicted shut-off power factor cosΦ _f 2. is important. The operator of the power factor automatic adjustment apparatus according to the first embodiment shuts off predicted power when the shut-off target capacitor 52n2 to be shut off next is shut off among the power factor adjusting capacitors 52a, 52b, 52c,. The rate cos Φ _f 2 can be recognized from the predicted value display means 13. In particular, the power factor automatic adjustment apparatus of the first embodiment has an intermediate zone MDZ in which the capacitor to be turned on 52n1 is not turned on and the capacitor to be cut off 52n2 is not cut off, and the reactive power VAR is below the cut-off level Lc. In the intermediate zone MDZ on the leading power factor side, the power factor automatic adjustment device does not block the cutoff target capacitor 52n2. In this case, the predictive power ratio calculating means 11 (Equation 7), calculates the cutoff predictive power factor coΦ _{f 2} when the blocking target capacitor 52n2 is interrupted, the predicted value display is the cutoff predictive power factor cos _{f 2} Since it is displayed on the means 13, the operator does not cut off the shut-off target capacitor 52n2 from the shut-off predicted power factor cosΦ _f 2. It is possible to prevent the power factor automatic adjustment device from being erroneously determined to be abnormal because it is recognized that the power factor is lower than the rate (the target power factor is equal to the charging level Lj of the charging target capacitor 52n1).

  Next, the processing operation of the automatic power factor adjustment apparatus according to Embodiment 1 configured as described above will be described with reference to FIGS. 2A and 2B. 2A and 2B are flowcharts showing the processing operation of the first embodiment. The flowcharts of FIGS. 2A and 2B include steps ST101 to ST128 following the start. The points P1 and P2 in FIGS. 2A and 2B are the same points.

  First, in FIG. 2A, step ST101 continues to start through point P1. In step ST101, it is determined whether or not the setting value set by the setting unit 2 has been changed. If there is a change in the setting value of the setting means 2 and the determination result in step ST101 is YES, the process proceeds to step ST102, the setting value of the setting means 2 is updated, and the process proceeds to step ST104. On the other hand, if the setting value of the setting unit 2 is not changed and the determination result in step ST101 is NO, the process proceeds to step ST103, the current setting value of the setting unit 2 is maintained, and the process proceeds to step ST104.

  In step ST104, the active power calculating means 3 calculates the active power W based on (Equation 1). In the next step ST105, the reactive power calculation means 4 calculates the reactive power VAR based on (Equation 2).

  In the next step ST106, the current power factor calculation means 5 uses the active power W calculated by the active power calculation means 3 and the reactive power VAR calculated by the reactive power calculation means 4 based on (Equation 3). To calculate the current power factor cosΦ. In the next step ST107, the current value display means 12 displays the current power factor cosΦ calculated by the current power factor calculation means 5.

  In the next step ST108, when starting the power factor automatic adjustment device, the capacitor capacity of the power factor adjusting capacitors 52a, 52b, 52c,... Set by the setting unit 2 by the next control capacitor selecting unit 6; Based on the control mode including the order in which the power factor adjusting capacitors 52a, 52b, 52c,... Are turned on and the order in which they are shut off, the next input capacitor 52n1 to be turned on and the capacitor capacity Cn1 are selected. Then, the capacitor 52n2 to be blocked next and the capacitor capacitance Cn2 are selected. In addition, after the power factor automatic adjusting device is started, the current input and cutoff states stored in the capacitor capacities of the power factor adjusting capacitors 52a, 52b, 52c,..., The control mode, and the control state storage means 9 are used. Based on the above, the capacitor 52n1 to be input next, the capacitor capacity Cn1, the capacitor 52n2 to be interrupted next, and the capacitor capacity Cn2 are selected.

In the next step ST 109, the making and breaking level computing unit 7, on the basis the target power factor cos _T set by the setting means 2, the effective power W calculated by the effective power computing means 3, by (Equation 4), The input level Lj is calculated, and the input level Lj is determined as the input level Lj = the input level calculation result.

In the next step ST110, the making and breaking level computing unit 7, and the target power factor cos _T set by the setting means 2, based on the capacitance Cn2 of the blocking target capacitor 52n2 selected in the next control capacitor selection means 6, Next, the cutoff level Lc of the cutoff target capacitor 52n2 to be cut off is calculated by (Equation 5). In the next step ST111, it is determined whether or not the calculation result of the cutoff level Lc calculated in step ST110 is a calculation result of the cutoff level Lc> 0.

  If the calculation result of the cutoff level Lc> 0, the determination result in step ST111 is YES, and the process proceeds to step ST112. In step ST112, the cutoff level Lc is determined as the calculation result of the cutoff level Lc = the cutoff level Lc. The process proceeds to point P2. On the other hand, if the calculation result of the cutoff level Lc ≦ 0, the determination result in step ST111 is NO, and the process proceeds to step ST113. In this step ST113, the cutoff level Lc is determined with the cutoff level Lc = 0, and the point P2 Proceed to

  2B, the process proceeds from step P2 to step ST114. In Step ST114, the reactive power VAR calculated by the reactive power calculating means 4 is compared with the input level Lj calculated by the input cutoff level calculating means 7 by the input / cutoff determining means 8, and the reactive power VAR ≦ the input level Lj. It is determined whether or not.

When reactive power VAR ≦ input level Lj, reactive power VAR exists in input zone ONZ, and the determination result in step ST114 is YES, so the process proceeds to step ST115, and in step ST115, the determination result in step ST114 is obtained. Then, the input interruption determination means 8 outputs the prediction power factor calculation means 11 to the next step ST116. In step ST116, the predicted power factor calculation means 11 makes the active power W calculated by the active power calculation means 3 and the reactive power VAR calculated by the reactive power calculation means 4 according to the determination result of the input / cutoff determination means 8. Then, based on the capacitor capacity Cn1 of the capacitor 52n1 selected by the next control capacitor selection means 6, the prediction power factor cosΦ _f 1 is calculated by (Equation 6).

In the next step ST117, the predicted predicted power factor cosΦ _f 1 calculated by the predicted power factor calculating means 11 in step ST116 is displayed by the predicted value display means 13. In the next step ST118, the closing signal discriminating means 8 outputs a closing signal Son to the closing target capacitor 52n1 to be turned on next. In the next step ST119, the capacitor contact blocking means 10 operates the electromagnetic contactor connected to the input target capacitor 52n1 based on the input signal Son output in step ST118, and the input target capacitor 52n1 is turned into the electric circuit 100. throw into.

  In the next step ST120, the control state storage unit 9 updates the on / off state of only the input target capacitor 52n1 that has been turned on to the on state based on the on signal Son output from the on / off determination unit 8. Then, the on / off state of all the power factor adjusting capacitors 52a, 52b, 52c,... Is updated. At the same time, the power factor adjustment capacitors 52 a, 52 b, 52 c,... Updated and stored in the control state storage unit 9 are output to the next control capacitor selection unit 6. Step ST120 follows point P1, and after step ST120, it returns to step ST101 via point P1 in FIG. 2A and repeats the processing after step ST101.

On the other hand, when reactive power VAR> input level Lj is satisfied in step ST114, the determination result in step ST114 is NO, so the process proceeds to step ST121. The determination result of step ST114 is output to the means 11, and it progresses to next step ST122. In step ST122, the predicted power factor calculation means 11 and the active power W calculated by the active power calculation means 3 and the reactive power VAR calculated by the reactive power calculation means 4 in accordance with the determination result of the input / cutoff determination means 8. Based on the capacitor capacitance Cn2 of the cutoff target capacitor 52n2 selected by the next control capacitor selection means 6, the cutoff predicted power factor cosΦ _f 2 is calculated by (Equation 7).

In the next step ST123, the predicted value display means 13 displays the predicted cutoff power factor cosΦ _f 2 calculated in step ST122. In the next step ST124, the reactive power VAR calculated by the reactive power calculator 4 and the cutoff level Lc determined in step ST112 or ST113 are compared by the input cutoff judgment unit 8 and the reactive power VAR <the cutoff level Lc. It is determined whether or not.

  If reactive power VAR <interruption level Lc, reactive power VAR exists in intermediate zone MDZ, and the determination result in step ST124 is YES, so the process proceeds to step ST125. In step ST125, in order to maintain the current on / off state, the on / off determining means 8 does not output the on / off signal Son or the off signal Sof. Step ST125 follows point P1, and after step ST125, the process returns to step ST101 via point P1 in FIG. 2A, and the processing after step ST101 is repeated.

  On the other hand, in step ST124, when reactive power VAR ≧ cutoff level Lc, reactive power VAR exists in cutoff zone OFZ, and the determination result in step ST124 is NO, so the process proceeds to step ST126. In this step ST126, the shut-off signal Sof for the shut-off target capacitor 52n2 to be shut off next is output by the making shut-off determining means 8. In the next step ST127, the capacitor charging / cutting means 10 cuts off the electromagnetic contactor connected to the cutoff target capacitor 52n2 based on the cutoff signal Sof output in step ST126, and disconnects the cutoff target capacitor 52n2 from the electric circuit 100. Cut off.

  In the next step ST128, the control state storage means 9 updates the on / off state of only the shut-off target capacitor 52n2 that has been cut off to the cut-off state based on the cut-off signal Sof output from the on / off determination unit 8. Then, the on / off state of all the power factor adjusting capacitors 52a, 52b, 52c,... Is updated. At the same time, the power factor adjusting capacitors 52a, 52b, 52c,... Updated and stored in the control state storage unit 9 are output to the next control capacitor selection unit 6. Step ST128 follows point P1, and after step ST128, the process returns to step ST101 via point P1 in FIG. 2A, and the processing after step ST101 is repeated.

The power factor automatic adjusting apparatus of the first embodiment as described above, calculates the cutoff predictive power factor cos _{f 2} in the case of blocking the blocking target capacitor 52n2 to be subsequently cut off, the cut-off predictive power factor cos _{f 2} Since the current power factor falls below the cutoff level Lc of the cutoff target capacitor 52n2 and is on the advanced power factor side, the cutoff target capacitor 52n2 is not cut off when the cutoff target capacitor 52n2 is cut off. In this case, it can be confirmed from the cutoff predicted power factor cosΦ _f 2 that it is lower than the target power factor (target power factor = loading level Lj), and it is not determined that the power factor automatic adjustment device is abnormal. Further, since the shut-off predicted power factor cosΦ _f 2 after the shut-off of the shut-off target capacitor 52n2 can be ascertained without manually shutting off the capacitor, the power factor of the electric circuit is deteriorated by manually shutting off the capacitor. Things can also be avoided.

Embodiment 2. FIG.
FIG. 3 is a block circuit diagram showing Embodiment 2 of the automatic power factor adjustment apparatus according to the present invention, and FIGS. 4A and 4B are flowcharts showing processing operations of the automatic power factor adjustment apparatus of Embodiment 2. FIG.

The power factor automatic adjusting apparatus according to the second embodiment uses a power factor adjusting unit 1A instead of the power factor adjusting unit 1 according to the first embodiment. This power factor adjustment unit 1A adds a virtual control state setting unit 14 and a predicted reactive power calculation unit 15 to the power factor adjustment unit 1 used in the first embodiment, and also predicts the power factor adjustment unit 1. The power factor calculation means 11 and the predicted value display means 13 are replaced with the predicted power factor calculation means 11A and the predicted value display means 13A, respectively. The predicted reactive power calculation unit 15 calculates the virtual control reactive power VAR _fctL and supplies the virtual control reactive power VAR _fctL to the predicted power factor calculation unit 11A. The virtual control state setting means 14 is configured using a computer register or memory, and the predicted power factor calculation means 11A and the predicted reactive power calculation means 15 are means executed by the CPU of the computer. The predicted value display means 13A is constituted by a computer display. The other configuration is the same as that of the first embodiment.

The virtual control state setting means 14 in the power factor adjustment unit 1A of the second embodiment has a virtual on / off state different from the current on / off state for the power factor adjusting capacitors 52a, 52b, 52c,. Set. The predicted reactive power calculation means 15 includes the capacitor capacities of the power factor adjusting capacitors 52a, 52b, 52c,... Set by the setting means 2, the reactive power VAR calculated by the reactive power calculation means 4, and the control state. The current on / off state of the power factor adjustment capacitors 52a, 52b, 52c,... Stored in the storage means 9, and the power factor adjustment capacitors 52a, 52b, 52c, set by the virtual control setting means 14. Are the predicted reactive power when the power factor adjusting capacitors 52a, 52b, 52c,... Are in the virtual on / off state, that is, the virtual control predicted reactive power VAR. _{Calculate fctL} .

The predicted power factor calculation unit 11A in the power factor adjustment unit 1A according to the second embodiment uses the active power W calculated by the active power calculation unit 3 and the virtual control predicted reactive power VAR _fctL calculated by the predicted reactive power calculation unit 15. Based on this, the power factor when the power factor adjusting capacitors 52a, 52b, 52c,... _Are in the virtual on / off state, that is, the virtual control predicted power factor _{cosΦ fctL} is calculated. The predicted value display means 13A displays the virtual control predicted power factor _{cosΦ fctL} calculated by the predicted power factor calculator 11A.

  Specifically, the virtual control state setting means 14 is independent of the current on / off state of the power factor adjusting capacitors 52a, 52b, 52c,... That are actually controlled by the power factor adjusting unit 1A. , A virtual on / off state is set for the power factor adjusting capacitors 52a, 52b, 52c,. For example, in the case where three power factor adjusting capacitors 52a, 52b, and 52c are used, the power factor adjusting capacitors 52a and 52b are turned on by the power factor adjusting unit 1A in the current on / off state. Assuming that the adjustment capacitor 52c is controlled to be in the cutoff state, the virtual control state setting means 14 regardless of that, the virtual on / off state, for example, the power factor adjusting capacitors 52a and 52c are in the on state, power factor adjustment. Capacitor 52b can be set in a cut-off state.

The predicted reactive power calculation means 15 includes the power factor adjustment capacitors 52a, 52b, 52c,... Set by the setting means 2 and the power factor adjustment capacitor 52a stored in the control state storage means 9. , 52b, 52c,..., 52b, 52c,..., 52b, 52c,. Further, the predicted reactive power calculation means 15 is for adjusting the power factor of the power factor adjustment capacitors 52a, 52b, 52c,... Set by the setting means 2 and the power factor adjustment set by the virtual control state setting means 14. Based on the virtual on / off states of the capacitors 52a, 52b, 52c,..., A virtual control total capacity ΣC _{ctL obtained} by summing up the capacitor capacities of all the power factor adjusting capacitors that have been put on in the virtual on / off state. Ask for. Further, the predicted reactive power calculation means 15 is based on the total capacity ΣC, the virtual control total capacity ΣC _ctL , and the reactive power VAR calculated by the reactive power calculation means 4, and the power factor adjusting capacitors 52a, 52b, 52c,. _{Is calculated} by the following (Equation 8), the predicted reactive power set by the virtual control state setting means 14 in the virtual on / off state, that is, the virtual controlled predicted reactive power VAR _fctL .
VAR _fctL = VAR−ΣC + ΣC _ctL (Equation 8)

The predicted power factor calculating means 11A is based on the active power W calculated by the active power calculating means 3 and the virtual control predicted reactive power VAR _fctL calculated by the predicted reactive power calculating means 15, and the power factor adjusting capacitors 52a and 52b. , 52c,... _Are set in the virtual control state setting means 14 and the predicted power factor in the virtual on / off state, that is, the virtual control predicted power factor _{cosΦ fctL} is _expressed by the following (Equation 9). Calculate.
_{cosΦ fctL} = cos {tan ^-1 [VAR _fctL / W]} (Equation 9)
The predicted value display means 13A displays the virtual control predicted power factor _{cosΦ fctL} calculated by the predicted power factor calculator 11A.

  Next, the processing operation of the power factor automatic adjustment apparatus of Embodiment 2 configured as described above will be described with reference to FIGS. 4A and 4B. 4A and 4B includes steps ST101 to ST114, steps ST118 to ST120, steps ST124 to ST128, and steps ST201 to ST206 following the start of FIG. 4A. Points P1 and P3 in FIGS. 4A and 4B are the same point.

  In FIG. 4A, step ST101 to step ST103 are executed through point P1 from the start. Steps ST101 to ST103 are the same as steps ST101 to ST103 of the first embodiment shown in FIG. 2A, and the process proceeds from step ST102 or ST103 to step ST201. In step ST201, it is determined whether or not the virtual control state setting value set by the virtual control state setting unit 14 has been changed. If there is a change in the virtual control state setting value set by the virtual control state setting means 14, the determination result in step ST201 is YES, the process proceeds to the next step S202, and the virtual control state setting value is updated in step ST202. On the other hand, if there is no change in the virtual control state setting value, the determination result in step ST201 is NO, and the process proceeds to step ST203. In step ST203, the current virtual control state setting value is maintained as it is.

  Subsequent to step ST202 or ST203, steps ST104 to ST107 are executed. These steps ST104 to ST107 are the same as steps S104 to ST107 of the first embodiment shown in FIG. 2A. The process proceeds from step ST107 to step ST204.

In step ST204, the capacitor capacity of the power factor adjusting capacitors 52a, 52b, 52c,... Set by the setting means 2 by the predicted reactive power calculation means 15 and the power factor stored in the control state storage means 9. The total capacity ΣC obtained based on the current on / off states of the adjustment capacitors 52a, 52b, 52c,..., And the power factor adjustment capacitors 52a, 52b, 52c,. and capacitance of the set power factor correction capacitors 52a in virtual control state setting unit 14, 52 b, 52c, virtual control sum capacity determined on the basis of the making and breaking state of the virtual · · · .SIGMA.C _ctL, and invalid Based on the reactive power VAR calculated by the power calculation means 4, the virtual control predicted reactive power VAR _fctL is calculated by (Equation 8).

In the next step ST205, based on the active power W calculated by the active power calculator 3 and the virtual control predicted reactive power VAR _fctL calculated by the predicted reactive power calculator 15 by the predicted power factor calculator 11A, virtual control is performed. The predicted power factor _{cosΦ fctL} is calculated by (Equation 9). In the next step ST206, the predicted value display means 13A displays the virtual control predicted power factor _{cosΦ fctL} calculated by the predicted power factor calculation means 11A. From step ST206 to point P3.

  Moving to FIG. 4B, step ST108 to step ST114 are executed from point P3. These steps ST108 to ST114 are the same as steps ST108 to ST114 of Embodiment 1 in FIG. 2A.

  If the determination result in step ST114 is YES and the reactive power VAR ≦ the input level Lj, the reactive power VAR exists in the input zone ONZ, so steps ST118 to ST120 are executed. These steps ST118 to ST120 are the same as steps ST118 to ST120 of the first embodiment shown in FIG. 2B. In step ST119, the charging target capacitor 52n1 is loaded.

  On the other hand, when the determination result in step ST114 is NO and reactive power VAR> input level Lj, steps ST124 to ST128 are executed. Steps ST124 to ST128 are the same as steps ST124 to ST128 of Embodiment 1 shown in FIG. 2B. In step ST125, the reactive power VAR is present in the intermediate zone MDZ, so that the capacitor to be turned on 52n1 is not turned on and the capacitor to be cut off 52n2 is not cut off, and the current power factor adjusting capacitors 52a, 52b, 52c,. The state of ・ ・ is maintained. In step ST127, since the reactive power VAR exists in the cutoff zone OFZ, the cutoff target capacitor 52n2 is cut off.

The power factor automatic adjusting apparatus of the second embodiment as described above, before the actual blocking of the closing-up of the target capacitor 52n1 or blocking target capacitor 52N2,, in step ST20 5, virtual in making and breaking state of the virtual calculates a control predicted power factor cos _fcTL, and displays it in step ST20 6. If the virtual on / off state is, for example, a state in which the target capacitor 52n2 is shut off, the predicted power factor when the target capacitor 52n2 is shut off is confirmed by the virtual control predicted power factor _{cosΦ fctL.} can do. Therefore, the virtual control predicted power factor _{cosΦ fctL} in the virtual on / off state can be confirmed without manually shutting off the capacitor, and the power factor is automatically adjusted without deteriorating the power factor of the electric circuit by manual operation. It is possible to prevent the apparatus from being erroneously determined to be abnormal.

Embodiment 3 FIG.
Figure 5 shows to block circuit diagram of a third embodiment of the power factor automatic adjuster according to the present invention, FIGS. 6A, 6B, 6C are flowcharts showing the processing operation of the power factor automatic adjustment device of the third embodiment It is.

The third embodiment of Figure 5, instead of the force Ritsucho integer unit 1 in the first embodiment, using the power Ritsucho integer unit 1B. This force Ritsucho integer unit 1B adds to the force Ritsucho integer unit 1 shown in FIG. 1, the manual operating unit 16, the manual operation capacitance selection means 17, the manual operation judgment unit 18, and the alarm means 19, also forces The next control capacitor selection means 6, the control state storage means 9, the capacitor insertion cutoff means 10, the predicted power factor calculation means 11, and the predicted value display means 13 in the rate adjustment unit 1 are respectively replaced with the next control capacitor selection means 6 B and the control state storage. Instead of the means 9B, the capacitor insertion blocking means 10B, the predicted power factor calculating means 11B, and the predicted value display means 13B. The next control capacitor selection means 6B, the predicted power factor calculation means 11B, the manual operation capacitor capacity selection means 17, and the manual operation determination means 18 are means executed by the CPU of the computer. The capacitor insertion blocking means 10B is constituted by a computer output circuit. The control state storage unit 9B is configured by using a computer memory, and the predicted value display unit 13B is configured by a computer display. The manual operation means 16 is installed outside the computer and connected to an input circuit of the computer. The alarm means 19 is installed outside the computer and connected to an output circuit of the computer. Other than this, the configuration is the same as in the first embodiment.

Manual actuating means 16 forces Ritsucho integer unit 1B in the third embodiment, the power factor correction capacitors 52a, 52 b, 52c, in ..., any one capacitor 52m in the closed state, by manually Can be blocked. When the manual operation means 16 performs a shut-off operation on the manual shut-off target capacitor 52m, the manual operation means 16 outputs a manual operation signal for the manual shut-off target capacitor 52m. The manual operation capacitor capacity selection means 17 is based on the manual operation signal from the manual operation means 16 and is selected from the power factor adjusting capacitors 52a, 52b, 52c,. 52m is selected and its capacitor capacitance Cm is selected.

The predicted power factor calculation means 11B is based on the active power W calculated by the active power calculation means 3, the reactive power VAR calculated by the reactive power calculation means 4, and the capacitor capacity Cm of the manual cutoff target capacitor 52m. 16, the predicted power factor when the manual shut-off target capacitor 52m is shut off, that is, the manual shut-off predicted power factor cosΦ _fm is calculated by the following (Equation 10).
cosΦ _fm = cos {tan ⁻¹ [(VAR−Cm) / W] (Expression 10)

Manual operation determining means in the force Ritsucho integer unit 1B 18 the absolute value and, calculated in the prediction power factor calculating means 11B the manual shut-off predicted power factor cos _fm current power factor cos computed by the current power factor calculating means 5 of comparing the absolute value, the comparison result is | cosΦ | ≦ | cosΦ _fm | If it is, the blocking signal for the manual shut-off target capacitor 52m, i.e. outputs a manual blocking signal MSOF, the comparison result is | cos |> If | cosΦ _fm |, an alarm signal is output, and it is further determined whether or not the shut-off operation has been performed again by the manual operation means 16 within a certain time T, for example, 10 seconds. When the manual operation means 16 performs a shut-off operation again within a certain time T, a manual shut-off signal MSof is output, and the manual operation means 16 does not perform the shut-off operation within a certain time T. In this case, the blocking operation by the manual operation means 16 is cancelled.

Next the control capacitor selection means 6B in the force Ritsucho integer unit 1B is the start start of the power factor automatic adjuster, power factor correction capacitors 52a set by the setting means 2, 52 b, 52c, and capacitance of ... Based on the control mode including the order of turning on and off the capacitors, the capacitor 52n1 to be turned on next, the capacitor capacity Cn1 is selected, and the capacitor to be cut off 52n2 to be cut off next, and the capacitor The capacitor Cn2 is selected. Further, when the manual shut-off signal MSof is output from the manual operation determining means 18 after the power factor automatic adjusting device is started, the manual shut-off target capacitor 52m to be shut off by the manual operating means 16 is automatically adjusted by the power factor automatic adjustment. The power factor adjusting capacitors 52a, 52b, 52c,... Set by the setting means 2 are excluded from the selection target capacitors of the next insertion target capacitor 52n1 and the next cutoff target capacitor 52n2. Based on the capacity, the control mode including the order of turning on and off the capacitors, and the current power factor adjusting capacitors 52a, 52b, 52c, ... stored in the control state storage means 9B, Next, the capacitor 52n1 to be input next, its capacitor capacity Cn1, and the target to be interrupted next A capacitor 52n2, to select the capacitance of the capacitor Cn2.

  For example, if a manual cutoff signal MSof for the power factor adjusting capacitor 52a is output from the manual operation determining means 18, the next control capacitor selecting means 6B is set by the setting means 2 with the capacitor 52a excluded from selection. .. For the power factor adjustment capacitors 52a, 52b, 52c,..., The control mode including the order of turning on and off the capacitors, and the current power factor adjustment stored in the control state storage means 9B. Based on the on / off state of the capacitors 52a, 52b, 52c,..., The capacitor 52n1, the capacitor capacity Cn1, the capacitor Cn1, and the capacitor 52n2 to be cut out of the capacitors 52b, 52c,. Select Cn2. That is, in this case, the power factor adjusting capacitor 52a is not subject to automatic control by the power factor control adjusting unit 1B.

  The control state storage means 9B outputs a closing signal Son for the closing target capacitor 52n1 outputted from the closing interruption determination means 8, a blocking signal Sof for the interruption target capacitor 52n2, and a manual interruption target capacitor 52m output from the manual operation determination means 18. Based on the manual shut-off signal MSof, the current shut-off state of the power factor adjusting capacitors 52a, 52b, 52c,... Is updated and stored, so that the current power factor adjusting capacitors 52a, 52b, 52c,. Stores the shut-off state of. Further, the updated and stored closing state is output to the next control capacitor selection means 6B.

  For example, when the closing signal Son is output to the power factor adjusting capacitor 52a by the closing / blocking determining unit 8, the control state storage unit 9B stores the power factor adjusting capacitors 52a, 52b currently stored therein. 52c,..., 52c,... Are updated and stored in the on / off state of only the power factor adjusting capacitor 52a. Further, the updated and stored closing state is output to the next control capacitor selection means 6B. Further, when the manual operation means 16 performs the shut-off operation of the power factor adjusting capacitor 52a and the manual shut-off signal MSof is output from the manual operation determining means 18 to the power factor adjusting capacitor 52a, the control state storage is performed. The means 9B updates the on / off state of only the power factor adjusting capacitor 52a to the off state from the on / off state of the power factor adjusting capacitors 52a, 52b, 52c,. Remember. Further, the updated and stored closing state is output to the next control capacitor selection means 6B.

The capacitor charging / blocking means 10B is based on the closing signal Son output from the switching on / off determining means 8, the blocking signal Sof, and the manual cutoff signal MSof output from the manual operation determining means 18, based on the power factor adjusting capacitors 52a, 52b. , 52c,... Are turned on or off. The alarm unit 19 generates an alarm output based on the alarm signal output from the manual operation determination unit 18. The predicted value display means 13B displays the manual shutoff predicted power factor cosΦ _fm calculated by the predicted power factor calculation means 11B.

  Next, the processing operation of the automatic power factor adjustment apparatus according to Embodiment 3 configured as described above will be described with reference to FIGS. 6A, 6B, and 6C. The flowcharts of FIGS. 6A, 6B, and 6C include steps ST101 to ST114, steps ST118 to ST120, steps ST124 to ST128, and steps ST301 to ST314 following the start of FIG. 6A. In the flowcharts of FIGS. 6A, 6B, and 6C, points P1, P4, and P5 indicate the same points.

  First, in FIG. 6A, from the start, it passes through point P1, reaches step ST101, and steps ST101 to ST107 are executed. These steps ST101 are the same as steps ST101 to ST107 of the first embodiment shown in FIG. 1A, and the same processing is executed. In step ST107, the current power factor cos Φ is displayed on the current value display means 12.

In the next step ST301, the manual operation capacitor capacity selection means 17 detects a manual operation signal from the manual operation means 16, and determines whether or not a manual shut-off operation has been performed. If there is a manual shut-off operation, the determination result in step ST301 is YES, and the process proceeds to point P4. The processing flow after this point P4 is shown in FIG. 6B. If there is no manual shut-off operation, the determination result in step ST301 is NO, and the process proceeds to point P5. The processing flow after this point P5 is shown in FIG. 6C.

It moves to FIG. 6B and progresses to step ST302 from the point P4. In this step ST302, the manually operated capacitor capacity selecting means 17 selects the manually interrupted capacitor 52m that is to be interrupted by the manual operating means 16 and its capacitor capacity Cm. In the next step ST303, based on the active power W calculated by the active power calculation means 3, the reactive power VAR calculated by the reactive power calculation means 4, and the capacitor capacity Cm by the predicted power factor calculation means 11B (Equation 10 ) To calculate the manual shutoff predicted power factor cosΦ _fm .

In next step ST304, the predicted value display means 13B displays the predicted manual shutoff power factor cosΦ _fm calculated in step ST303. In the next step ST305, the manual operation determining means 18 compares the absolute value of the current power factor cosΦ calculated in step ST106 with the absolute value of the manual shutoff predicted power factor cosΦ _fm calculated in step ST303. | cosΦ | ≦ | it determines whether this is the | cosΦ _fm.

  If the decision result in the step ST305 is YES, the process proceeds to a step ST306, and in this step ST306, the manual operation determining means 18 outputs the manual shutoff signal MSof for the manual shutoff target capacitor 52m that is the shutoff target by the manual operation means 16 To do. In the next step ST307, the capacitor contact cutoff means 10B operates the electromagnetic contactor connected to the manual cutoff target capacitor 52m based on the manual cutoff signal MSof output in step ST306, thereby cutting off the manual cutoff target capacitor 52m. To do.

  In the next step ST308, the control state storage unit 9B updates and stores the on / off state of only the manual interruption target capacitor 52m into the interruption state based on the manual interruption signal MSof output in step ST306. Further, the updated and stored closing / blocking state is output. In the next step ST309, the next control capacitor selection means 6B causes the manual cutoff target capacitor 52m to be turned on by the power factor automatic adjustment, and the next target capacitor 52n1 to be turned on and the target capacitor of the next cutoff target capacitor 52n2. Excluded from. After step ST309, the process reaches point P1, passes through point P1 in FIG. 6A, returns to step ST101, and repeats the processes after step ST101.

On the other hand, the determination result in step ST305 if a NO, that | cosΦ |> | cosΦ _fm | If it is, the process proceeds to step ST 310, in step ST 310, by manual operation judgment unit 18 outputs an alarm signal . In the next step ST311, the alarm means 19 generates an alarm output.

  In the next step ST312, the manual operation determining means 18 determines whether or not the manual operation means 16 has performed the shut-off operation again within a certain time T. If the decision result in the step ST312 is YES, that is, if the shut-off operation is performed again by the manual operation means 16 within the fixed time T, the process proceeds to the step ST313. In this step ST313, the manual operation determining means 18 outputs a manual cutoff signal MSof for the manual cutoff target capacitor 52m, and performs the processes of steps ST307 to ST309.

  On the other hand, if the determination result in step ST312 is NO, that is, if the manual operation means 16 has not performed the shut-off operation again within a certain time T, the process proceeds to step ST314. In step ST314, the manual operation is performed. The interruption operation by means 16 is canceled. After step ST314, it reaches point P1, returns to step ST101 via point P1 in FIG. 6A, and repeats the processing after step ST101.

  Next, moving to FIG. 6C, the process proceeds from step P5 to step ST108, and the processes of steps ST108 to ST14 are executed. Steps ST108 to ST114 are the same as steps ST108 to ST114 of the first embodiment shown in FIG. 2B, and the same processes as the processes of steps ST108 to ST114 of the first embodiment are executed. In step ST114, it is determined whether or not reactive power VAR ≦ input level Lj.

  If the decision result in the step ST114 is YES, that is, if the reactive power VAR ≦ the input level Lj and the reactive power VAR exists in the input zone ONZ, the processes of steps ST118 to ST120 are executed. Steps ST118 to ST120 are the same as steps ST118 to 120 of the first embodiment shown in FIG. 2B, and the same processes as steps ST118 to ST120 of the first embodiment are executed. After step ST120, it reaches point P1, returns to step ST101 via point P1 in FIG. 6A, and repeats the processing after step ST101.

  When the determination result of step ST114 is NO, that is, when reactive power VAR> input level Lj, the processes of steps ST124 to ST128 are executed. Steps ST124 to ST128 are the same as steps ST124 to 128 in the first embodiment shown in FIG. 2B, and the same processes as those in steps ST124 to ST128 in the first embodiment are executed. In step ST125, the reactive power VAR is present in the intermediate zone MDZ, so that the capacitor to be turned on 52n1 is not turned on and the capacitor to be cut off 52n2 is not cut off, and the current power factor adjusting capacitors 52a, 52b, 52c,. The state of ・ ・ is maintained. In step ST127, since the reactive power VAR exists in the cutoff zone OFZ, the cutoff target capacitor 52n2 is cut off. After steps ST125 and ST128, the process reaches point P1, returns to step ST101 via point P1 in FIG. 6A, and repeats the processes after step ST101.

As described above, in the power factor automatic adjustment device according to the third embodiment, the manual shutoff prediction when the manual shutoff target capacitor 52m is shut off before the manual shutoff target capacitor 52m is actually shut off by manual operation is performed. The power factor cosΦ _fm is calculated and displayed. This manual cutoff target capacitor 52m is a capacitor that is selected in order to confirm the power factor adjustment operation when an abnormality of the power factor automatic adjustment device is assumed. In the third embodiment, when an abnormality of the power factor automatic adjustment device is assumed, the manual shutoff predicted power factor in the case where the manual shutoff target capacitor 52m to be shut off is shut off before actually shutting off. By checking cosΦ _fm in advance, the power factor automatic adjustment device can be prevented from being erroneously determined to be abnormal. Also, when the manual shutoff predicted power factor cosΦ _fm is worse than the current power factor cosΦ, an alarm is output to check whether the manual shutoff target capacitor 52m is actually shut off. In addition, when the manual operation means 16 performs a shut-off operation on the manual shut-off target capacitor 52m, the manual operation is performed again within a certain time T after the manual operation. Since the manual shutoff target capacitor 52m is actually shut off only when the manual shutoff target capacitor 52m is accidentally operated, the manual shutoff target capacitor 52m can be prevented from being shut off.

Embodiment 4 FIG.
FIG. 7 is a block circuit diagram showing a fourth embodiment of the automatic power factor adjustment apparatus according to the present invention, and FIGS. 8A and 8B are flowcharts showing the processing operation of the automatic power factor control apparatus of the fourth embodiment.

In the power factor automatic adjustment device of the fourth embodiment, instead of the force Ritsucho integer unit 1 according to the first embodiment, the force Ritsucho integer unit 1C is used. This force Ritsucho integer unit 1C includes a virtual capacitance setting means 20 to the power factor correction unit 1 used in the first embodiment, the prediction reactive power calculation means 15C added, also, power factor correction unit 1 definitive following control capacitor The selection means 6, the cutoff cutoff level calculation means 7, the cutoff cutoff determination means 8, the control state storage means 9, the capacitor insertion cutoff cutoff means 10, the predicted power factor calculation means 11, and the predicted value display means 13 are respectively set to the next control capacitor selection means. 6C, insertion cutoff level calculation means 7C, insertion cutoff judgment means 8C, control state storage means 9C, capacitor insertion cutoff means 10C, predicted power factor calculation means 11C, and predicted value display means 13C. The next control capacitor selection means 6C, the input cutoff level calculation means 7C, the input cutoff judgment means 8C, the predicted power factor calculation means 11C, and the predicted reactive power calculation means 15C are means executed by the CPU of the computer, and control state storage The means 9C is composed of a computer memory, the virtual capacitor capacity setting means 20 is composed of a computer register or memory, and the predicted value display means 13C is composed of a computer display. The other configuration is the same as that of the first embodiment.

  The virtual capacitor capacity setting means 20 in the power factor adjustment unit 1C according to the fourth embodiment has capacitor capacities Cva, Cvb, Cvc... Different from the capacitor capacities of the power factor adjusting capacitors 52a, 52b, 52c,. Are virtual capacitors VCa, VCb, VCc,... Installed in the electric circuit 100 instead of the power factor adjusting capacitors 52a, 52b, 52c,. The capacitor numbers VCa, VCb, VCc,... And the capacitor capacities Cva, Cvb, Cvc,. For example, assuming that the capacitor capacities of the actual power factor adjusting capacitors 52a, 52b, and 52c are 100 [kvar], 150 [kvar], and 200 [kvar], virtual capacitor capacities Cva, Cvb of the virtual capacitors VCa, VCb, VCc, Cvc is set to 50 [kvar], 75 [kvar], and 100 [kvar], which are different from the capacitor capacities of the power factor adjusting capacitors 52a, 52b, and 52c.

The next control capacitor selection means 6C of the power factor adjustment unit 1C is configured so that the actual power factor adjustment capacitors 52a, 52b, 52c,... Based on the control mode including the order in which the actual power factor adjusting capacitors 52a, 52b, 52c,... Are turned on and off, the actual power factor adjusting capacitors 52a, 52b, 52c,. Next, the capacitor 52n1 to be input next, the capacitor capacity Cn1, the capacitor 52n2 to be interrupted next, and the capacitor capacity Cn2 are selected. Further, the next control capacitor selection means 6C, when the power factor automatic adjustment device is started up, based on the control mode set in the setting means 2 and the set value set in the virtual capacitor capacity setting means 20 together, Of the power factor adjusting capacitors VCa, VCb, VCc,..., The virtual capacitor VCn1 to be next input, the capacitor capacitance Cvn1, the virtual capacitor VCn2 to be interrupted next, Capacitor capacitance Cvn2 is selected.

  Further, after the power factor automatic adjusting device is activated, the next control capacitor selecting unit 6C is configured to set the actual power factor adjusting capacitors 52a, 52b, 52c,... , And the actual power factor adjusting capacitors 52a, 52b, 52c,... Stored in the control status storage means 9C, the actual power factor adjusting capacitors 52a, 52b, 52c,. From among the capacitors to be inserted 52n1 to be input next and the capacitor capacitance Cn1 are selected, and the capacitor to be interrupted 52n2 to be blocked next and the capacitor capacitance Cn2 are selected. Further, after the power factor automatic adjustment device is activated, the next control capacitor selection unit 6C is configured to set the control mode set in the setting unit 2, the virtual power factor adjustment capacitor VCa set in the virtual capacitor capacity setting unit 20, , And the current of the virtual power factor adjusting capacitors VCa, VCb, VCc,... Stored in the control state storage means 9C. Based on the control state, the virtual power supply target capacitor VCn1 to be input next and the capacitor capacitance Cvn1 are selected from the virtual power factor adjusting capacitors VCa, VCb, VCc,. The virtual interruption target capacitor VCn2 and the capacitor capacitance Cvn2 are selected.

The power cut-off level calculating means 7C of the power factor adjusting unit 1C is based on the target power factor cosΦ _T set in the setting means 2 and the active power W calculated by the active power calculating means 3, and the actual power factor adjusting capacitor 52a, 52b, 52c,... Is calculated by (Equation 4) with respect to the input target capacitor 52n1 selected from among the target power factor cosΦ _T , active power W, and next control capacitor selection means Based on the capacitor capacity Cn2 of the cutoff target capacitor 52n2 selected by 6C, the cutoff level Lc for the cutoff target capacitor 52n2 is calculated by (Equation 5).

At the same time, the input cutoff level calculating means 7C is configured based on the target power factor cosΦ _T set in the setting means 2 and the active power W calculated in the active power calculating means 3, and the virtual power factor adjusting capacitors VCa, VCb. , VCc,..., VCn1 selected from the input level Ljv is calculated by the following (Equation 11).
Ljv = − [tan {cos ⁻¹ (cos Φ _T )} × W] (Formula 11)
The unit of the virtual input level Ljv is [var], which is the same as the unit of the reactive power VAR.

Further, the on / off level calculation means 7C applies to the virtual cutoff target capacitor VCn2 based on the target power factor cosΦ _T , the active power W, and the capacitor capacity Cvn2 of the virtual cutoff target capacitor VCn2 selected by the next control capacitor selection means 6C. The cutoff level Lcv is calculated by the following (Equation 12).
Lcv = − [tan {cos ⁻¹ (cosΦ _T )} × W] + (Cvn2 × a) (Equation 12)
In (Equation 12), the unit of the virtual cutoff level Lcv is [var] which is the same as the unit of the reactive power VAR, and a is a constant.
However, when the calculation result of Lcv is 0 or smaller than 0, Lcv = 0.

The power interruption adjusting unit 8C of the power factor adjusting unit 1C compares the reactive power VAR calculated by the reactive power calculating means 4 with the input level Lj or the interruption level Lc, and the actual power factor adjusting capacitors 52a, 52b, 52c,... Are selected to determine whether to turn on the target capacitor 52n1 selected from among them, and whether to shut off the target capacitor 52n2, and output the input signal Son and the cutoff signal Sof based on the determination result. . In addition, the on / off determination unit 8C compares the virtual capacity predicted reactive power VAR _fc calculated by the predicted reactive power calculating unit 15C with the virtual on-off level Ljv or the virtual off-level Lcv, and the virtual capacitors VCa, VCb, VCc. ,...,... Are selected and whether or not the virtual cutoff target capacitor VCn2 is cut off is determined. Based on the determination result, the input signal to the virtual input target capacitor VCn1 is determined. That is, the virtual closing signal VSon and the cutoff signal for the virtual cutoff target capacitor VCn2, that is, the virtual cutoff signal VSof are output.

  The on / off determination means 8C compares the reactive power VAR calculated by the reactive power calculating means 4 with the input level Lj calculated by the on / off level calculating means 7C, and the comparison result is reactive power VAR ≦ input level Lj. In this case, since the reactive power VAR is present in the making zone ONZ, the making signal Son for the making object capacitor 52n1 in the actual power factor adjusting capacitors 52a, 52b, 52c,. On the other hand, if the comparison result is reactive power VAR> input level Lj, then reactive power VAR is compared with cutoff level Lc calculated by input cutoff level calculation means 7C, and reactive power VAR ≧ cut off If the level is Lc, the reactive power VAR is present in the cutoff zone OFZ, so the cutoff signal Sof for the cutoff target capacitor 52n2 in the actual power factor adjusting capacitors 52a, 52b, 52c,. If the comparison result between the reactive power VAR and the cutoff level Lc is the reactive power VAR <the cutoff level Lc, the reactive power VAR is present in the intermediate zone MDZ, so that neither the input signal Son nor the cutoff signal Sof is output.

Furthermore, the on / off determination unit 8C compares the virtual capacity predicted reactive power VAR _fc calculated by the predicted reactive power calculation unit 15C with the virtual on-off level Ljv calculated by the on / off level calculation unit 7C, and the comparison result. When the virtual capacity predicted reactive power VAR _fc ≦ virtual charging level Ljv, a charging signal for the virtual charging target capacitor VCn1 in the virtual capacitors VCa, VCb, VCc,. To do. On the other hand, if the comparison result between the virtual capacity predicted reactive power VAR _fc and the virtual input level Ljv is virtual capacity predicted reactive power VAR _fc > virtual input level Ljv, then the virtual capacity predicted reactive power VAR _fc , The virtual cutoff level Lcv calculated by the input cutoff level calculation means 7C is compared, and if the comparison result is the virtual capacity predicted reactive power VAR _fc ≧ temporary cutoff level Lcv, the cutoff signal for the virtual cutoff target capacitor VCn2, that is, the temporary cutoff level Lcv If the cutoff signal VSof is output and the virtual capacity predicted reactive power VAR _fc <the temporary cutoff level Lcv, neither the virtual closing signal Vson nor the virtual cutoff signal VSof is output. Capacitor making and breaking unit 10C is on signal Son, blocking signal Sof, virtual insertion signal VSON, and receives the virtual cutoff signal VSON, on signal Son, the blocking signal Sof, similarly to Dante stage 10 shielding a capacitor is turned on, on target The capacitor 52n1 is cut off, and the cutoff target capacitor 52n2 is cut off. The virtual closing signal Vson and the virtual cutoff signal VOf do not control the actual power factor adjusting capacitors 52 a , 52 b ,.

  The control state storage unit 9C of the power factor adjusting unit 1C is configured to store the actual power factor adjusting capacitors 52a, 52b, 52c,... Based on the closing signal Son and the blocking signal Sof output from the closing / closing determining unit 8C. The current on / off state is updated and stored, and based on the virtual on / off signal Vson and virtual off signal VSof output from the on / off discriminating means 8C, the virtual capacitors VCa, VCb, VCc,. The virtual on / off state is updated and stored, and the actual on / off state of the updated actual power factor adjusting capacitors 52a, 52b, 52c,..., And the updated virtual capacitors VCa, VCb. , VCc,... The current on / off state is output to the next control capacitor selection means 6C and the predicted reactive power calculation means 15C.

The predicted reactive power calculation means 15C of the power factor adjustment unit 1C is based on the setting value set in the setting means 2, the reactive power VAR calculated in the reactive power calculation means 4, and the setting value set in the virtual capacitor capacity setting means 20. The virtual capacitors VCa, VCb, VCc,... Are installed in the electric circuit 100, and the present reactive power when the power factor is adjusted, that is, the virtual capacity predicted reactive power VAR _fc is calculated.

More specifically, the predicted reactive power calculation means 15C is stored in the capacitor capacity of the actual power factor adjustment capacitors 52a, 52b, 52c,... Set in the setting means 2 and the control state storage means 9C. Based on the current on / off state of the actual power factor adjusting capacitors 52a, 52b, 52c,... Ask. In addition, a plurality of virtual capacitor capacities Cva, Cvb, Cvc,... Set in the virtual capacitor capacity setting means 20 and the virtual capacitors VCa, VCb, VCc,... Stored in the control state storage means 9C. Based on the current virtual cut-off state, the virtual capacitor total capacity ΣC _c obtained by summing the capacitor capacities of the currently input virtual capacitors is obtained. Furthermore, based on the capacitor total capacity ΣC, the virtual capacitor total capacity ΣC _c , and the reactive power VAR calculated by the reactive power calculation means 4, virtual capacitors VCa, VCb, VCc are connected to the electric circuit 100, and the control state storage means 9C The current reactive power when the virtual control state stored in (i) is reached, that is, the virtual capacity predicted reactive power VAR _fc is calculated by the following (Equation 13).
VAR _fc = VAR−ΣC + ΣC _c (Equation 13)

The predicted power factor calculating unit 11C is configured to add a virtual capacitor VCa to the electric circuit 100 based on the active power W calculated by the active power calculating unit 3 and the virtual capacity predicted reactive power VAR _fc calculated by the predicted reactive power calculating unit 15C. VCb, VCc,... Are installed, and the current power factor when the virtual control state stored in the control state storage unit 9C is reached, that is, the virtual capacity predicted power factor cosΦ _fc, is expressed by the following (formula 14). To calculate.
cosΦ _fc = cos {tan ^-1 [(VAR _fc ) / W]} (Expression 14)

The predicted value display means 13C displays the virtual capacity predicted power factor cosΦ _fc calculated by the predicted power factor calculation means 11C.

Next, the processing operation of the automatic power factor adjustment apparatus according to Embodiment 4 configured as described above will be described with reference to FIGS. 8A and 8B. 8A and 8B are flowcharts for explaining the processing operation flow of the fourth embodiment. 8A and 8B includes steps ST101 to ST107, ST110 to ST114, ST118 to ST120, ST124 to ST128, and steps ST401 to 419 following the start of FIG. 8A. Points P1 and P6 in FIGS. 8A and 8B indicate the same points.

  First, in FIG. 8A, the process reaches step ST101 from the start via point P1, and the processes from step ST101 to step ST103 are executed. Steps ST101 to ST103 are the same as steps ST101 to ST103 of the first embodiment shown in FIG. 2A, and the same processing as steps ST101 to ST103 of the first embodiment is executed.

  From step ST102 or ST103, the process proceeds to the next step ST401. In this step ST401, the virtual capacitor capacity setting means 20 determines whether or not the set values of the set virtual capacitor capacity Cva, Cvb, Cvc,. In the next step ST402, when the virtual capacitor capacity is changed as a result of the determination in step ST401, the virtual capacitor capacity is updated. On the other hand, if the result of determination in step ST401 is that there is no change in the virtual capacitor capacity, the current virtual capacitor setting value is maintained.

Step ST402 or ST4 03, led to the step ST 104, it executes the processing from step ST104~ step ST 107. Steps ST104 to ST107 are the same as steps ST104 to ST107 of the first embodiment shown in FIG. 2A, and the same processing as steps ST104 to ST107 of the first embodiment is executed. In step ST107, the current power factor ( cos Φ) is displayed, and the process proceeds to step ST404.

In step ST 404, the predicted reactive power calculation means 15C, the reactive power calculation means 4 in the calculated reactive power VAR and capacitor total capacity .SIGMA.C, and based on the virtual capacitor total capacity .SIGMA.C _c, disabled virtual volume predicted by equation (13) The power VAR _fc is calculated. In the next step ST405, based on the active power W calculated by the active power calculating means 3 and the virtual capacity predicted reactive power VAR _fc calculated by the predicted reactive power calculating means 15C by the predicted power factor calculating means 11C, In 14), the virtual capacity prediction power factor cosΦ _fc is calculated.

In the next step ST406, the predicted value display means 13C displays the virtual capacity predicted power factor cosΦ _fc calculated by the predicted power factor calculation means 11C. In the next step ST407, the next control capacitor selection means 6C uses the actual power factor adjusting capacitors 52a, 52b, 52c,... Then, the cutoff target capacitor 52n2 to be shut off and the capacitor capacitance Cn2 are selected. Moreover, In step ST40 7, virtual capacitor VCa set in the virtual capacitance setting means 20, VCb, capacitance of VCc Cva, Cvb, Cvc, among ..., virtual on target capacitor then is turned VCn1 And the virtual capacitor capacitance Cvn1, the virtual cutoff target capacitor VCn2 to be shut off next, and the virtual capacitor capacitance Cvn2 are selected.

In the next step ST408, the closing level calculating means 7C calculates the closing level Lj of the closing target capacitor 52n1 selected from the actual power factor adjusting capacitors 52a, 52b, 52c,... According to (Equation 4 ). , The input level Lj = the input level Lj is determined as the input level calculation result. In step ST408, the virtual charging level Ljv of the virtual charging target capacitor VCn1 selected from the virtual capacitors VCa, VCb, VCc,... Is calculated according to (Equation 11), and the virtual charging level Ljv = virtual charging level calculation result. As a result, the virtual input level Ljv is determined. The process proceeds from step ST408 to point P6.

  Next, moving to FIG. 8B, the process from step P6 to step ST110 is executed, and the processes from step ST110 to ST113 are executed. Steps ST110 to ST113 are the same as steps ST110 to ST113 of the first embodiment shown in FIG. 2A, and the same processing as steps ST110 to ST113 of the first embodiment is executed. In step ST112, the cutoff level Lc = The blocking level Lc is determined as the blocking level calculation result. In step ST113, the blocking level Lc = 0. From step ST112 or step ST113, the process proceeds to the next step ST409.

  In step ST409, the insertion cutoff level calculation means 7C calculates the virtual cutoff level Lcv of the virtual insertion target capacitor VCn1 selected from the virtual capacitors VCa, VCb, VCc,. In the next step ST410, it is determined whether or not the calculation result of the virtual cutoff level Lcv calculated in step ST409 is the calculation result of the virtual cutoff level Lcv> 0. If the calculation result of the virtual cutoff level Lcv is greater than 0 and the determination result in step ST410 is YES, the process proceeds to step ST411. In step ST411, the virtual cutoff level Lcv = the virtual cutoff level Lcv is calculated as the calculation result. The blocking level Lcv is determined. On the other hand, if the calculation result of the virtual cutoff level Lcv is ≦ 0 and the determination result in step ST410 is NO, the process proceeds to step ST412. In this step ST412, the virtual cutoff level Lcv = 0 and the virtual cutoff level Lcv is set. decide.

  Next, step ST114 is executed. Step ST114 is the same as step ST114 of the first embodiment shown in FIG. 2A, performs the same processing as step ST114 of the first embodiment, compares reactive power VAR with input level Lj, and makes reactive power VAR ≦ input. It is determined whether or not the level is Lj.

  If reactive power VAR ≦ input level Lj, the determination result in step ST114 is YES, and reactive power VAR is present in input zone ONZ, so the processing from steps ST118 to ST120 is executed. Steps ST118 to ST120 are the same as steps ST118 to ST120 of the first embodiment shown in FIG. 2A, and the same processes as steps ST118 to ST120 of the first embodiment are performed. In step ST119, the capacitor insertion / blocking means 10C is used to input the capacitor 52n1 for input, and in step ST120, the control state storage means 9C is updated.

  If reactive power VAR> input level Lj, the determination result in step ST114 is NO, the process proceeds to step ST124, and the processes from steps ST124 to ST128 are executed. Steps ST124 to ST128 are the same as steps ST124 to ST128 of the first embodiment shown in FIG. 2A, and the same processes as steps ST124 to ST128 of the first embodiment are performed. In step ST125, the reactive power VAR is in the intermediate zone MDZ, and the closing signal Son for the closing target capacitor 52n1 and the blocking signal Sof for the blocking target capacitor 52n2 are not output. In step ST127, the reactive power VAR is in the cutoff zone OFZ, and the cutoff signal Sof for the cutoff target capacitor 52n2 is output by the capacitor insertion cutoff means 10C. In step ST128, the control state storage means 9C is updated.

The process proceeds from step ST120, ST125, or ST128 to step ST413. In step ST413, the virtual capacity predicted reactive power VAR _fc calculated by the predicted reactive power calculating means 15C and the input cutoff level calculating means 7C by the input cutoff determining means 8C. The calculated virtual input level Ljv is compared to determine whether or not the virtual capacity predicted reactive power VAR _fc ≦ virtual input level Ljv. When the virtual capacity predicted reactive power VAR _fc ≦ virtual charging level Ljv, the determination result in step ST413 is YES, and the process proceeds to step ST414. In this step ST414, the charging / disconnection determining unit 8C causes the virtual capacitors VCa, VCb, A virtual input signal Vson for the virtual input target capacitor VCn1 selected from VCc,... Is output.

  In the next step ST415, only the virtual capacitor VCn1 for which the virtual input signal VSon is output among the virtual capacitors based on the virtual input signal Vson output from the input interruption determination unit 8C by the control state storage unit 9C. Update the blocking state to the virtual on state and store it. Further, in this control state storage means 9C, the updated and stored power factor adjusting capacitors 52a, 52b, 52c,..., And the on / off states of the virtual capacitors VCa, VCb, VCc,. The state is output to the next control capacitor selection means 6C and the predicted reactive power calculation means 15. After step ST415, it reaches point P1, passes through point P1 in FIG. 8A, returns to step ST101, and repeats the processing after step ST101.

On the other hand, when the virtual capacity predicted reactive power VAR _fc > virtual input level Ljv, the determination result of step ST413 is NO, and the process proceeds to step ST416. In this step ST416, the input cutoff determination unit 8C compares the virtual capacity predicted reactive power VAR _fc calculated by the predicted reactive power calculation unit 15C with the virtual cutoff level Lcv calculated by the input cutoff level calculation unit 7C, It is determined whether or not the virtual capacity predicted reactive power VAR _fc <the virtual cutoff level Lcv.

If the virtual capacity predicted reactive power VAR _fc <the virtual cutoff level Lcv, the determination result in step ST416 is YES, and the process proceeds to step ST417. In this step ST417, in order to maintain the current virtual on / off state, the on / off discrimination means 8C does not output the virtual on / off signal VSon nor the virtual on / off signal VOf. After step ST417, the process reaches point P1, passes through point P1 in FIG. 8A, returns to step ST101, and repeats the processes after step ST101.

On the other hand, when the virtual capacity predicted reactive power VAR _fc ≧ virtual cutoff level Lcv, the determination result in step ST416 is NO, and the process proceeds to step ST418. In this step ST418, the virtual cutoff signal VSof for the virtual cutoff target capacitor VCn2 selected from the virtual capacitors is output by the input cutoff discrimination unit 8C.

  In the next step ST419, only the virtual capacitor VCn2 to which the virtual cutoff signal VSof is output is output from the virtual capacitor based on the virtual cutoff signal VSof outputted from the cutoff cutoff determining means 8C by the control state storage means 9C. Update the block state to the virtual block state and store it. Furthermore, the control state storage means 9C updates and stores the power factor adjusting capacitors 52a, 52b, 52c,..., And the input / shutdown states of the virtual capacitors VCa, VCb, VCc,. The state is output to the next control capacitor selection means 6C and the predicted reactive power calculation means 15C. After step ST319, it reaches point P1, returns to step ST101 via point P1 in FIG. 8A, and repeats the processing after step ST101.

  As described above, in the power factor automatic adjusting apparatus according to the fourth embodiment, a plurality of virtual capacitors VCa and VCb having capacitor capacities different from the capacitor capacities of the actual power factor adjusting capacitors 52a, 52b, 52c,. , VCc,..., VCc,..., VCc,... Are set in the virtual capacitor setting means 20, so that instead of the power factor adjusting capacitors actually installed in the electric circuit 100, Check the power factor when the virtual capacitor of the virtual capacitor capacity is installed and the power factor is improved without changing the actually installed power factor adjusting capacitors 52a, 52b, 52c,. When the power factor automatic adjustment device is assumed to be abnormal, the capacitor is not manually shut off. While avoiding the situation that the power factor automatic adjusting device can be prevented from being determined as abnormal by mistake.

Embodiment 5 FIG.
FIG. 9 is a block circuit diagram showing Embodiment 5 of the automatic power factor adjusting apparatus according to the present invention. 10A and 10B are flowcharts illustrating processing operations of the automatic power factor control apparatus according to the fifth embodiment.

  In this fifth embodiment, a power factor adjustment unit 1D is used instead of the power factor adjustment unit 1C used in the fourth embodiment. This power factor adjustment unit 1D is similar to the power factor adjustment unit 1C in the fourth embodiment except for the active power amount calculation means 21, the reactive power amount calculation means 22, the predicted reactive power amount calculation means 23, the average power factor calculation means 24, and the prediction. The average power factor calculation means 25 is added, and the current value display means 12 and the predicted value display means 13C in the power factor adjustment unit 1C used in the fourth embodiment are replaced with the current value display means 12D and the predicted value, respectively. Instead of the display means 13D. The active power amount calculating means 21, the reactive power amount calculating means 22, the predicted reactive power amount calculating means 23, the average power factor calculating means 24, and the predicted average power factor calculating means 25 are means executed by the CPU of the computer. The current value display unit 12D and the predicted value display unit 13D are configured by a computer display. Other configurations are the same as those in the fourth embodiment.

The active power amount calculating means 21 in the power factor adjusting unit 1D of the fifth embodiment is based on the active power W calculated by the active power calculating means 3 and is an integrated value of the active power W for a predetermined period M, for example, one month. A certain amount of active power Wh is calculated. The reactive power amount calculation unit 22 calculates a reactive power amount VARh that is an integrated value of the reactive power VAR in the predetermined period M based on the reactive power VAR calculated by the reactive power calculation unit 4. Predicted reactive power amount calculating means 23, predicted reactive power calculation means based on the virtual volume predicted reactive power VAR _fc calculated by 15C, the virtual capacity reactive energy VARh is an integrated value of the virtual capacity reactive power VAR _fc in a predetermined period M _fc is calculated. The average power factor calculation means 24 is based on the active power amount Wh calculated by the active power amount calculation means 21 and the reactive power amount VARh calculated by the reactive power amount calculation means 22, for a predetermined period M of the current power factor cosΦ. An average power factor cosΦ _avg which is an average value is calculated. The predicted average power factor calculating unit 25 is based on the active power amount Wh calculated by the active power amount calculating unit 21 and the virtual capacity predicted reactive power amount VARh _fc calculated by the predicted reactive power amount calculating unit 23. , Instead of the actual power factor adjusting capacitors 52a, 52b, 52c,..., The capacitor capacities Cva, Cvb, Cvc of the virtual capacitor capacities VCa, VCb, VCc,. using ..., calculates a virtual capacity predicted average power factor cos _Fcavg is an average value of a predetermined period M with virtual capacity predicted power factor cos _fc in case of performing power factor correction. The current value display means 12D displays the current power factor cos Φ calculated by the current power factor calculation means 5 and the average power factor cos Φ _avg calculated by the average power factor calculation means 24. The predicted value display means 13D displays the virtual capacity predicted power factor cosΦ _fc calculated by the predicted power factor calculator 11C and the virtual capacity predicted average power factor _{cosΦ fcavg} calculated by the predicted average power factor calculator 25.

The average power factor calculation means 24 is based on the active power amount Wh calculated by the active power amount calculation means 21 and the reactive power amount VARh calculated by the reactive power amount calculation means 22, for a predetermined period M of the current power factor cosΦ. An average power factor cosΦ _avg which is an average value is calculated by the following (Expression 15).
cosΦ _avg = cos {tan ⁻¹ (VARh / Wh)} (Equation 15)

It predicted mean power factor calculating means 25, based on the virtual capacity predicted amount of reactive power VARhr _fc calculated by active power calculating means active energy Wh calculated at 21, and the predicted reactive power amount calculating means 2 3, the virtual capacity The virtual capacity predicted average power factor ( _{cosΦ fcavg} ), which is the average value of the predicted power factor _{cosΦ fc for} a predetermined period M, is calculated by the following (Expression 16).
_{cosΦ fcavg} = cos {tan ⁻¹ (VARh _fc / Wh)} (Expression 16)

The current value display means 12D displays the current power factor cos Φ calculated by the current power factor calculation means 5 and the average power factor cos Φ _avg calculated by the average power factor calculation means 24. The predicted value display means 13D displays the virtual capacity predicted power factor cosΦ _fc calculated by the predicted power factor calculator 11C and the virtual capacity predicted average power factor _{cosΦ fcavg} calculated by the predicted average power factor calculator 25.

Next, the processing operation of the automatic power factor adjustment apparatus according to Embodiment 5 configured as described above will be described with reference to FIGS. 10A and 10B. 10A, 10B are flowcharts showing the processing operation that put the power factor automatic adjuster of the fifth embodiment. 10A and 10B are steps ST101 to ST103, ST401 to ST403, ST104 to ST107, ST404 to ST406, ST501 to ST504, ST407 to ST408, ST110 to ST113, ST409 to ST412 and ST114 following the start of FIG. 10A. , ST118 to ST120, ST124 to ST128, and ST413 to ST419. Points P1 and P7 in FIGS. 10A and 10B indicate the same points.

10A, from start to step ST101, steps ST101 to ST103, next steps ST401 to ST403, next steps ST104 to ST107, and then steps ST404 to ST406 are executed. These steps are the same as step ST101 to step ST103, step ST401 to step ST403, step ST104 to step ST107, and step ST404 to step ST406 of the fourth embodiment shown in FIG. 8A, and the same processing is executed. In Step ST406, the virtual capacity prediction power factor cosΦ _fc is displayed.

In the next step ST501, the current power factor is calculated based on the active power amount Wh calculated by the active power amount calculating means 21 and the reactive power amount VARh calculated by the reactive power amount calculating means 22 by the average power factor calculating means 24. An average power factor cosΦ _avg that is an average value of cosΦ for a predetermined period M is calculated by (Equation 15). In the next step ST502, the average power factor cosΦ _avg calculated by the average power factor calculation means 24 is displayed by the current value display means 12D.

In next step ST503, the predicted average power factor calculating unit 25 calculates the active power amount Wh calculated by the active power amount calculating unit 21 and the virtual capacity predicted reactive power amount VARh _fc calculated by the predicted reactive power amount calculating unit 23. the basis to calculate the virtual volume expected average power factor cos _Fcavg is an average value of a predetermined period M of the virtual volume predictive power factor cos _fc in (equation 16). In the next step ST504, the predicted value display means 13D displays the virtual capacity predicted average power factor _{cosΦ fcavg} calculated by the predicted average power factor calculation means 25.

  After step ST504, steps ST407 to ST408 are executed to reach point P7. Steps ST407 and 408 are the same as steps ST407 and 408 of the fourth embodiment shown in FIG. 8A, and the same processes as steps ST407 and 408 of the fourth embodiment are executed.

  After point P7, the process moves to FIG. 10B, and steps ST110 to ST113 are executed, then steps ST409 to ST412 are executed, then steps ST114, ST118 to ST120, and steps ST124 to ST128 are executed, and then step ST413 is executed. ˜ST419 is executed. Each of these steps is the same as the step of the fourth embodiment shown in FIG. 8B, and the same processing as that of the fourth embodiment is executed. After steps ST415, 417, and 419, the process returns to step ST101 in FIG. 10A via point P1, and the processes after step ST101 are repeated.

  As described above, in the power factor automatic adjusting apparatus according to the fifth embodiment, a plurality of virtual capacitors VCa, VCb having capacitor capacities different from the capacitor capacities of the actual power factor adjusting capacitors 52a, 52b, 52c,. , VCc,..., VCc,..., VCc,... Are set in the virtual capacitor setting means 20, so that instead of the power factor adjusting capacitors actually installed in the electric circuit 100, Check the power factor when a virtual capacitor of a virtual capacitor capacity is installed and power factor adjustment is performed without changing the actually installed power factor adjusting capacitors 52a, 52b, 52c,. When the power factor automatic adjustment device is assumed to be abnormal, the capacitor is not manually shut off. While avoiding the situation that the power factor automatic adjustment device, accidentally can be prevented from being determined to be abnormal, it is possible to check the average power factor of the predetermined period M together.

  The power factor automatic adjusting device according to the present invention can be applied to an application for improving the power factor in an AC electric circuit.

1 is a block circuit diagram showing a first embodiment of an automatic power factor adjustment apparatus according to the present invention. FIG. 5 is a flowchart showing a part of processing operation of the power factor automatic adjustment apparatus according to the first embodiment. 6 is a flowchart showing the remaining part of the processing operation of the automatic power factor adjustment apparatus according to Embodiment 1; FIG. 5 is a block circuit diagram showing a second embodiment of the power factor automatic adjusting apparatus according to the present invention. 9 is a flowchart showing a part of the processing operation of the power factor automatic adjustment apparatus according to the second embodiment. 9 is a flowchart showing the remaining part of the processing operation of the automatic power factor adjustment apparatus according to the second embodiment. FIG. 6 is a block circuit diagram showing a third embodiment of the power factor automatic adjusting apparatus according to the present invention. 10 is a flowchart showing a part of processing operation of the power factor automatic adjustment apparatus according to the third embodiment. 9 is a flowchart showing another part of the processing operation of the power factor automatic adjustment apparatus according to the third embodiment. 9 is a flowchart showing the remaining part of the processing operation of the automatic power factor adjustment apparatus according to the third embodiment. FIG. 9 is a block circuit diagram showing a fourth embodiment of the automatic power factor adjusting device according to the present invention. 9 is a flowchart showing a part of the processing operation of the power factor automatic adjustment apparatus according to the fourth embodiment. 9 is a flowchart showing the remaining part of the processing operation of the automatic power factor adjustment apparatus according to the fourth embodiment. FIG. 9 is a block circuit diagram showing a fifth embodiment of the power factor automatic adjusting apparatus according to the present invention. 10 is a flowchart showing a part of the processing operation of the power factor automatic adjustment apparatus according to the fifth embodiment. 10 is a flowchart showing the remaining part of the processing operation of the power factor automatic adjustment apparatus according to the fifth embodiment.

1, 1A, 1B, 1C, 1D: power factor adjustment unit, 2: setting means, 3: active power calculation means,
4: Reactive power calculation means, 5: Current power factor calculation means,
6, 6B, 6C: Next control capacitor selection means, 7, 7C: Input cutoff level calculation means,
8, 8C: Insertion / cutoff determination means, 9, 9B, 9C: Control state storage means,
10, 10B: Capacitor insertion blocking means,
11, 11A, 11B, 11C: Predictive power factor calculation means, 12, 12D: Current value display means,
13, 13A, 13B, 13C, 13D: predicted value display means, 14: virtual control state setting means, 15, 15C: predicted reactive power calculation means, 16: manual operation means,
17: manual operation capacitor capacity selection means, 18: manual operation determination means, 19: alarm means,
20: Virtual capacitor capacity setting means, 24: Average power factor calculation means,
25: Predicted average power factor calculation means 101: Measurement transformer 102: Measurement current transformer

Claims (6)

A power factor automatic adjustment device that automatically adjusts the power factor of an electric circuit using a plurality of power factor adjustment capacitors,
Active power calculating means for calculating the active power of the electric circuit;
Reactive power calculation means for calculating reactive power of the electric circuit,
Current power factor calculation means for calculating a current power factor based on the active power and the reactive power;
Setting means for setting a control mode including a target power factor, a capacitor capacity of the plurality of power factor adjusting capacitors, and a turn-on order and a shut-off order of the plurality of power factor adjusting capacitors;
Based on the capacitor capacity of the plurality of power factor adjustment capacitors and the control mode, among the plurality of power factor adjustment capacitors, a capacitor to be charged next, a capacitor to be blocked next to be cut off, And a next control capacitor selecting means for selecting a capacitor capacity of the capacitor to be cut off,
Based on the active power and the target power factor, the charging level for the capacitor to be charged is calculated, and at the same time, based on the active power, the target power factor, and the capacitor capacity of the capacitor to be blocked, the cutoff Input cutoff level calculation means for calculating the cutoff level for the target capacitor,
Determining whether the reactive power is in an intermediate zone divided between the input level and the cut-off level, an input zone smaller than the intermediate zone, or a cut-off zone larger than the intermediate zone; When reactive power is in the input zone, an input signal for the input capacitor is generated, and when the reactive power is in the cutoff zone, an interruption signal for the interruption target capacitor is generated, and the reactive power is generated. Is in the intermediate zone, the closing shut-off determination means that does not generate the closing signal and the shut-off signal,
Based on the input signal and the cutoff signal, the current on / off state of the plurality of power factor adjusting capacitors is stored, and the current on / off state of the plurality of power factor adjusting capacitors is output to the next control capacitor selecting means. Control state storage means for
More determination result of the making and breaking determining means, when said and said reactive power when the reactive power is in the intermediate zone is in the blocking zone, and the active power, and the reactive power, the capacitor of the blocking target capacitor A power factor comprising: a predicted power factor calculating means for calculating a predicted shut-off power factor when the shut-off target capacitor is shut off based on a capacity; and a predicted value display means for displaying the predicted shut-off power factor Automatic adjustment device. The power factor automatic adjustment device according to claim 1, wherein the next control capacitor selection means also selects a capacitor capacity of the input target capacitor,
More determination result of the previous SL making and breaking determining means, when the reactive power is in the closing zone, the predicted power factor calculation means, and the active power, and the reactive power, the capacitance of the on target capacitor Based on the calculation of the estimated power factor when the capacitor to be charged is charged,
The power factor automatic adjusting device, wherein the predicted value display means also displays the input predicted power factor. A power factor automatic adjustment device that automatically adjusts the power factor of an electric circuit using a plurality of power factor adjustment capacitors,
Active power calculating means for calculating the active power of the electric circuit;
Reactive power calculation means for calculating reactive power of the electric circuit,
Current power factor calculation means for calculating a current power factor based on the active power and the reactive power;
And the target power factor, and capacitance of the plurality of power factor correction capacitors, setting means for setting a control mode including interrupting the sequence and the input sequence of said plurality of power factor correction capacitors,
Based on the capacitor capacity of the plurality of power factor adjustment capacitors and the control mode, among the plurality of power factor adjustment capacitors, a capacitor to be charged next, a capacitor to be blocked next to be cut off, And a next control capacitor selecting means for selecting a capacitor capacity of the capacitor to be cut off,
Based on the active power and the target power factor, the charging level for the capacitor to be charged is calculated, and at the same time, based on the active power, the target power factor, and the capacitor capacity of the capacitor to be blocked, the cutoff Input cutoff level calculation means for calculating the cutoff level for the target capacitor,
Determining whether the reactive power is in an intermediate zone divided between the input level and the cut-off level, an input zone smaller than the intermediate zone, or a cut-off zone larger than the intermediate zone; When reactive power is in the input zone, an input signal for the input capacitor is generated, and when the reactive power is in the cutoff zone, an interruption signal for the interruption target capacitor is generated, and the reactive power is generated. Is in the intermediate zone, the closing shut-off determination means that does not generate the closing signal and the shut-off signal,
Based on the input signal and the cutoff signal, the current on / off state of the plurality of power factor adjusting capacitors is stored, and the current on / off state of the plurality of power factor adjusting capacitors is output to the next control capacitor selecting means. Control state storage means for
Virtual control state setting means for setting a virtual on / off state different from the current on / off state for the plurality of power factor adjusting capacitors,
Based on the reactive power, the current on / off state of the plurality of power factor adjusting capacitors stored in the control state storage means, and the virtual on / off state set by the virtual control setting means, the plurality of forces Predictive reactive power calculating means for calculating virtual control predicted reactive power when the rate adjusting capacitor is in the virtual on / off state,
Based on the active power and the virtual control prediction reactive power, a prediction power factor calculation means for calculating a virtual control prediction power factor when the plurality of power factor adjustment capacitors are in the virtual on / off state, and An automatic power factor adjustment apparatus comprising: a predicted value display means for displaying a virtual control predicted power factor calculated by a predicted power factor calculation means. A power factor automatic adjustment device that automatically adjusts the power factor of an electric circuit using a plurality of power factor adjustment capacitors,
Active power calculating means for calculating the active power of the electric circuit;
Reactive power calculation means for calculating reactive power of the electric circuit,
Current power factor calculation means for calculating a current power factor based on the active power and the reactive power;
Setting means for setting a control mode including a target power factor, a capacitor capacity of the plurality of power factor adjusting capacitors, and a turn-on order and a shut-off order of the plurality of power factor adjusting capacitors;
Based on the capacitor capacity of the plurality of power factor adjustment capacitors and the control mode, a capacitor to be charged next to be turned on and a capacitor to be cut off to be cut off next are selected among the plurality of power factor adjustment capacitors. A next control capacitor selecting means for selecting, and also selecting a capacitor capacity of the capacitor to be cut off,
Based on the active power and the target power factor, the charging level for the capacitor to be charged is calculated, and at the same time, based on the active power, the target power factor, and the capacitor capacity of the capacitor to be blocked, the cutoff Input cutoff level calculation means for calculating the cutoff level for the target capacitor,
Determining whether the reactive power is in an intermediate zone divided between the input level and the cut-off level, an input zone smaller than the intermediate zone, or a cut-off zone larger than the intermediate zone; When reactive power is in the input zone, an input signal for the input capacitor is generated, and when the reactive power is in the cutoff zone, an interruption signal for the interruption target capacitor is generated, and the reactive power is generated. Is in the intermediate zone, the closing shut-off determination means that does not generate the closing signal and the shut-off signal,
Manual operation means for performing a shut-off operation with respect to one manual shut-off target capacitor of the power factor adjusting capacitor in the input state among the plurality of power factor adjusting capacitors;
Manual operation capacitor capacity selection means for selecting a capacitor capacity of the manual cutoff target capacitor based on the cutoff operation by the manual operation means,
Predictive power factor calculating means for calculating a manual shutoff predicted power factor when the manual shutoff target capacitor is shut off based on the active power, the reactive power, and the capacitor capacity of the manual shutoff target capacitor;
The absolute value of the current power factor calculated by the current power ratio calculating means, wherein when the predicted power factor is less than the absolute value of the computed manually blocked predictive power rate calculating means, manually for the manual blocking target capacitor When the absolute value of the current power factor is larger than the absolute value of the predicted manual power factor, an alarm signal is output and the manual operation means is output within a certain time. Manual operation determining means for outputting a manual cutoff signal for the manual cutoff target capacitor even when the cutoff operation is performed again by
Based on the input signal, the cutoff signal, and the manual cutoff signal, the current on / off state of the plurality of power factor adjustment capacitors is stored, and the current power of the plurality of power factor adjustment capacitors is stored in the next control capacitor selection means. Control state storage means for outputting the shut-off state of
An alarm unit that generates an alarm output based on an alarm signal output from the manual operation determination unit, and a predicted value display unit that displays a manual shutoff predicted power factor calculated by the predicted power factor calculation unit are provided. Power factor automatic adjustment device. A power factor automatic adjustment device that automatically adjusts the power factor of an electric circuit using a plurality of power factor adjustment capacitors,
Active power calculating means for calculating the active power of the electric circuit;
Reactive power calculation means for calculating reactive power of the electric circuit,
Current power factor calculation means for calculating a current power factor based on the active power and the reactive power;
And the target power factor, and capacitor capacity of said plurality of power factor correction capacitors, setting means for setting a control mode including interrupting the sequence and the input sequence of said plurality of power factor correction capacitors,
Assuming that a plurality of virtual capacitors having a capacitor capacity different from the capacitor capacity of the plurality of power factor adjustment capacitors are installed in the electric circuit instead of the plurality of power factor adjustment capacitors, the plurality of Virtual capacitor capacity setting means for setting the capacitor capacity of the virtual capacitor;
Based on the capacitor capacity of the plurality of power factor adjustment capacitors and the control mode, a capacitor to be charged next to be turned on and a capacitor to be cut off to be cut off next are selected among the plurality of power factor adjustment capacitors. Select a capacitor capacity of the capacitor to be shut off, and at the same time, based on the capacitor capacity of the plurality of virtual capacitors and the control mode, a virtual to be input next among the plurality of virtual capacitors A selection capacitor and a virtual cutoff target capacitor to be shut off next, and a next control capacitor selection means for selecting a capacitor capacity of the virtual cutoff target capacitor;
Based on the active power and the target power factor, calculate a charging level for the charging target capacitor and a virtual charging level for the virtual charging target capacitor; and the active power, the target power factor, and the cutoff Based on the capacitor capacity of the target capacitor, a cutoff level for the cutoff target capacitor is calculated. In addition, based on the active power, the target power factor, and the capacitor capacity of the virtual cutoff target capacitor, the virtual cutoff target capacitor is calculated. Input cutoff level calculation means for calculating a virtual cutoff level,
Based on the reactive power, the capacitor capacity of the plurality of power factor adjusting capacitors, and the capacitor capacity of the plurality of virtual capacitors, prediction for calculating virtual capacity prediction reactive power when the virtual capacitor is installed in the electric circuit Reactive power calculation means,
Determining whether the reactive power is in an intermediate zone divided between the input level and the cut-off level, an input zone smaller than the intermediate zone, or a cut-off zone larger than the intermediate zone; When reactive power is in the input zone, an input signal for the input capacitor is generated, and when the reactive power is in the cutoff zone, an interruption signal for the interruption target capacitor is generated, and the reactive power is generated. Is in the intermediate zone, the function that neither the input signal nor the cutoff signal is generated, and the virtual intermediate reactive power is divided between the virtual input level and the virtual cutoff level, Whether it is in a virtual launch zone that is smaller than this virtual intermediate zone or a virtual blocking zone that is larger than the virtual intermediate zone Determining that when the virtual capacity reactive power is in the virtual input zone, a virtual input signal for the virtual input target capacitor; and when the virtual capacity reactive power is in the virtual cutoff zone, An on / off discriminating means for generating a virtual off signal for a capacitor and having a function of not generating the virtual on-off signal and the virtual off-off signal when the virtual reactive power is in the virtual intermediate zone,
Based on the input signal and the cutoff signal, the current on / off state of the plurality of power factor adjusting capacitors is stored, and the current on / off state of the plurality of power factor adjusting capacitors is output to the next control capacitor selecting means. In addition, based on the virtual input signal and the virtual cutoff signal, the current virtual insertion cutoff state of the plurality of virtual capacitors is stored, and the current virtual insertion cutoff of the plurality of virtual capacitors is stored in the next control capacitor selection means. Control state storage means for outputting the state;
Predictive power for calculating a virtual capacity predictive power factor when the plurality of virtual capacitors are installed in the electric circuit instead of the plurality of power factor adjusting capacitors based on the active power and the virtual capacity predictive reactive power A power factor automatic adjustment apparatus comprising: a rate calculation unit; and a predicted value display unit that displays the predicted virtual capacity power factor. The power factor automatic adjustment device according to claim 5, further comprising:
Based on the active power and the reactive power, an average power factor calculation means for calculating an average power factor in a predetermined period of the current power factor, and on the basis of the active power and the virtual capacity reactive power, the virtual capacity predicted power factor An automatic power factor adjustment apparatus comprising: predicted average power factor calculation means for calculating a virtual capacity predicted average power factor in a predetermined period.

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