JPH06165385A - Power adjuster and controller - Google Patents

Abstract

PURPOSE:To perform power compensation while suppressing the operation loss of a power adjuster by operating the quantity of power compensation at such a level that the voltage ripple of a bus is in allowable range, and performing the power adjustment, based on the quantity of power compensation. CONSTITUTION:To suppress the voltage ripple, the unbalance, and the reactive power of a bus 1, a power adjuster 3 is connected to this bus 1 through a transformer 2 for voltage adjuster. Moreover, a controller 6 is equipped with a compensation amount operating circuit 8, which operates the power that the power adjuster 3 compensate and the operation output, and this compensation amount operating circuit 8 is equipped with a required compensation amount operating part 81, an actual compensation amount operating part 84, and others. And, especially, the actual compensation amount operating part 84 operates the quantity of power compensation at such a level that the voltage ripple of the bus 1 is in allowable range, based on the detected current and the detected voltage of the bus 1, and the power adjuster performs the power adjustment, based on this quantity of power compensation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-excited power adjustment control device.

[0002]

2. Description of the Related Art Generally, a self-excited power adjustment controller is
The amount of compensation is determined so that voltage fluctuations, unbalance, and reactive power of the busbar become as zero as possible, and the amount of compensation is given to the power adjusting unit to generate adjusted power and supplied to the busbar. Is the bus voltage DVB that fluctuates as shown in FIG.
(%) Is detected, and as shown in FIG. 6 (b), the amount of power compensation required to minimize voltage fluctuation, unbalance, and reactive power is calculated, and the regulated power corresponding to the required amount of compensation is supplied to the power. It was generated by the adjusting unit and the adjusting power was supplied to the busbar.

[0003]

However, in the conventional power adjustment control device, even if the voltage fluctuation, unbalance, and reactive power of the bus are within the allowable range ± DO in FIG. Is operated to supply the adjusted power to the bus bar by obtaining the necessary compensation amount so that the value becomes 0 as much as possible, that is, as shown in FIG. 7, the horizontal axis indicates the required compensation amount Sc and the vertical axis indicates the power adjustment unit. Compensation rate K (= actual compensation amount / necessary compensation amount)
, The required compensation amount Sc becomes the compensation capacity SSV of the power adjustment unit.
If it is within G, K = 1 (that is, actual compensation amount = necessary compensation amount) is being operated, and therefore there is a problem that a large load is constantly imposed on the power adjustment unit and an operating loss increases. .

The present invention has been made in view of the above-mentioned problems of the related art. The voltage fluctuation and the unbalance are compensated by a power compensation amount that is within an allowable range, and the load on the power adjusting unit is reduced. An object of the present invention is to provide a power adjustment control device that can reduce the operation loss and suppress the operation loss.

[0005]

SUMMARY OF THE INVENTION The present invention is a self-excited power adjustment controller for suppressing voltage fluctuations on a bus, compensating for unbalance, and compensating for reactive power, based on the detected current and detected voltage of the bus. A real compensation amount calculation unit that calculates a power compensation amount that allows the voltage fluctuation of the bus to fall within an allowable range, and a power adjustment unit that performs power adjustment based on the real compensation amount calculated by the real compensation amount calculation unit. It is a thing.

[0006]

In the power adjustment control device of the present invention, the actual compensation amount calculation unit calculates the amount of power compensation such that the voltage fluctuation of the bus is within the allowable range based on the detected current and the detected voltage of the bus, and this power compensation is performed. The power adjustment unit adjusts the power based on the amount, thereby reducing the load on the power adjustment device,
Keep operating loss low.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows the configuration of a general self-excited power adjustment control device. In order to suppress voltage fluctuations, unbalance, and reactive power of the bus bar 1, a transformer for the power adjustment device is connected to the bus bar 1. The power adjusting device 3 is connected via the device 2. Also, the current detector 4 and the voltage detector 5 attached to the bus bar 1 detect the current I0 and voltage V0 of the bus bar 1 and take them into the control device 6 and send them out to the power adjusting device 3 as a gate pulse signal. There is.

The control device 6 is, as shown in FIG.
The busbar current I0 detected by the current detector 4 and the busbar voltage V0 detected by the voltage detector 5 are taken in, and the positive-phase power of the busbar 1 is obtained.
Positive-phase / negative-phase detection circuit 7 for detecting negative-phase power, normal-phase power of the busbar detected by the positive-phase / negative-phase detection circuit 7, and power and operation output to be compensated by the power adjustment device 3 based on the negative-phase power And a gate pulse control circuit 9 for converting the power compensation amount obtained by the compensation amount calculation circuit 8 into a gate pulse signal and outputting the gate pulse signal for gate control of the power adjusting device 3. ing.

As shown in FIG. 3, the compensation amount calculating circuit 8 which is a feature of the embodiment of the present invention provides the required compensation amount Sc corresponding to the positive phase power and the negative phase power of the bus 1. Required compensation amount calculation unit 81 for calculating, threshold value setting unit 82 for setting threshold value Sl, and necessary compensation amount calculation unit 8
The required compensation amount Sc from 1 and the threshold value Sl from the threshold value setting unit 82 are compared, and a comparator 83 that outputs a switching signal according to the magnitude of these Sc and Sl, and the required compensation amount Sc.
And a threshold value Sl, a compensation rate K (= Sc / Sl) is calculated, and an actual compensation amount calculation unit 84 for calculating the actual compensation amount KSc,
Necessary compensation amount calculation unit 8 according to the switching signal from the comparator 83
Compensation amount switching unit 85 for switching and outputting the required compensation amount Sc from 1 or the actual compensation amount KSc from the actual compensation amount calculation unit 84.
It consists of

Next, the operation of the power adjustment control device having the above configuration will be described.

When the current I0 of the bus bar 1 is detected by the current detector 4 and the voltage V0 is detected by the voltage detector 5, and this is input to the positive / negative phase detection circuit 7 of the power adjustment control device 6, the positive / negative phase is detected. The phase detection circuit 7 detects the positive phase power and the negative phase power of the bus 1 and outputs them to the compensation amount calculation circuit 8.

The compensation amount calculation circuit 8 obtains the compensation amount S as follows and outputs it to the gate pulse control circuit 9. That is, when there is a voltage fluctuation on the bus bar 1 as shown in FIG. 4 (a), the power regulator 3 is operated so that the voltage fluctuation on the bus bar 1 falls within a certain range ± D0% shown in FIG. 4 (b). In order to perform it, the compensation rate K as shown in FIG. 5 is obtained, and the required compensation quantity Sc is multiplied by this compensation rate K to output as the actual compensation quantity S.

Here, when the required compensation amount Sc is less than a certain threshold value Sl, the compensation rate K is linearly changed by K = Sc / Sl (Sc ≦ Sl), and the required compensation amount Sc is a threshold value. If the value becomes equal to or more than Sl, K = 1 (Sc ≧ Sl).

In order to realize this as a circuit, the threshold value setting unit 82 sets the threshold value Sl, and the necessary compensation amount calculation unit 81 sets voltage fluctuation, imbalance, and reactive power to zero as much as possible. The required power compensation amount Sc is obtained, and the actual compensation amount KSc is obtained by the actual compensation amount calculation unit 84 by obtaining the compensation ratio K between the required compensation amount Sc and the threshold value Sl by the above equation.

Further, in the comparator 83, the required compensation amount Sc
And the threshold value Sl are compared, and if Sc ≦ Sl, the command to output the actual compensation amount KSc is issued. If Sc> Sl, the command to output the required compensation amount Sc as it is. If Sc ≧ SSVG, the required compensation amount Sc is output as it is. The command to perform is output to the compensation amount switching unit 85.

Therefore, the compensation amount switching section 85 is provided in the comparator 8.
In response to the switching command of No. 3, the actual compensation amount KSc from the actual compensation amount calculation unit 84 or the required compensation amount Sc from the required compensation amount calculation unit 81 is switched and output as the final compensation amount S to the gate pulse control circuit 9.

Thus, even if the bus voltage DVB fluctuates as shown in FIG. 4A, the required compensation amount Sc has a threshold value S.
In the case of 1 or less (Sc ≦ Sl), the compensation ratio K of the power adjustment device is linearly changed to perform the operation, and the required compensation amount Sc
Above a certain threshold and below the compensation capacity SSVG (Sl≤Sc
In the case of ≤SSVG), the operation is performed in the same manner as the conventional one with the compensation rate K = 1 and 100% of the required compensation amount.
The required compensation amount Sc is larger than the compensation capacitance SSVG (Sc>
In the case of SSVG), the compensation capacity is 100% as before.
By controlling the operation so as to perform the% compensation operation, the power compensation can be performed so that the voltage variation rate Dc 'shown in FIG.
The power output can be compensated so that the voltage fluctuation rate falls within the allowable fluctuation range while the driving output of the power adjustment device 3 is suppressed to a small level and the driving loss is reduced accordingly.

It should be noted that the threshold value Sl is set to a value within a range determined from the target permissible fluctuation range ± D0 of the bus bar 1, although the voltage fluctuation rate Dc 'increases as the value increases.

[0020]

As described above, according to the present invention, the actual compensation amount calculator calculates the amount of power compensation such that the voltage fluctuation of the bus is within the allowable range based on the detected current and the detected voltage of the bus. Since the power adjustment unit adjusts the power based on this power compensation amount, the load on the power adjustment unit can be reduced, and necessary power compensation can be performed while suppressing the operating loss.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a general power adjustment control device.

FIG. 2 is a circuit block diagram of a control device in the power adjustment control device.

FIG. 3 is a circuit block diagram of a control device according to an embodiment of the present invention.

FIG. 4 is a graph showing operating characteristics according to the above embodiment.

FIG. 5 is a graph showing a power compensation rate in the above embodiment.

FIG. 6 is a graph showing operating characteristics of a conventional example.

FIG. 7 is a graph showing a power compensation rate of a conventional example.

[Explanation of symbols]

 1 Bus 2 Transformer 3 Power Regulator 4 Current Detector 5 Voltage Detector 6 Controller 7 Positive / Negative Phase Detection Circuit 8 Compensation Amount Calculation Circuit 9 Gate Pulse Control Circuit 81 Necessary Compensation Amount Calculation Unit 82 Threshold Setting Unit 83 Comparator 84 Actual compensation amount calculation unit 85 Compensation amount switching unit Sc Necessary compensation amount Sl Threshold value S Compensation amount command value

Claims (1)

[Claims] 1. A method for suppressing fluctuations in voltage of a bus bar, compensating for imbalance,
In a self-excited power adjustment control device for compensating for reactive power, an actual compensation amount calculation unit for calculating a power compensation amount to such an extent that a voltage fluctuation of the bus is within an allowable range based on the detected current and voltage of the bus. A power adjustment control device comprising: a power adjustment unit that adjusts power based on the actual compensation amount calculated by the actual compensation amount calculation unit.