JP2637308B2 - Generator control - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator control device for adjusting the power, reactive power, frequency and the like of a generator to set values.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a conventional power constant control device for a generator. In FIG. 3, 1 is a generator for generating AC power, 2 is a transformer for an instrument for detecting a voltage, and 3 is a transformer for an instrument. A current transformer for detecting current, 4 a generator drive, 5 a power system as a load, 6 a communication breaker connected to the power system 5, 7 a generator breaker connected to the generator 1,
8 is a governor device for adjusting the output of the generator drive 4, 9 is a boiler for supplying steam to the generator drive 4, 10 is a voltage and current detected by the instrument transformer 2 and the instrument current transformer 3. A power detection unit for detecting power, 11 is a power setting unit for setting a target value for controlling power to be constant, and 12 is a power detection unit 1
A comparison operation unit that compares a power value detected at 0 with a set value determined by the power setting unit 11 and calculates a deviation thereof.
Reference numeral 3 denotes a governor control unit that generates a signal for increasing / decreasing the output to the governor device 8 based on the deviation signal of the comparison operation unit 12, and 14 includes a power detection unit 10, a power setting unit 11, a comparison operation unit 12, and a governor control unit 13. It is a constant power control device.

Next, the operation will be described. The constant power control device 14 is in a controllable state when both the generator circuit breaker 7 and the communication circuit breaker 6 are turned on. Based on the voltage and current from the power system 5 detected by the meter transformer 2 and the meter current transformer 3, the power detector 10 detects the power flowing from the power system 5. The detected power is compared with a value set in advance by the power setting unit 11 by the comparison calculation unit 12, and the deviation signal is received by the governor control unit 13. If the detected power is larger than the set value, an output increase signal is output to the governor device 8, and if the detected power is smaller than the set value,
An output reduction signal is output to the governor device 8. Thereby, the generator 1 is controlled so that the power flowing from the power system 5 is constant.
Adjust the output of.

[0004]

The conventional constant power control device is configured to control the power based on the instantaneous power detected as described above. When power management is performed based on the average power value, there is a problem that a control error increases to control the average power to be constant. Similarly, for frequency and reactive power,
There have been problems such as a large control error when managing the average value for each fixed period.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is intended to make the difference between the average value and the set value of power, frequency or reactive power for a certain period so small that it can be ignored.
It is an object of the present invention to obtain a generator control device capable of increasing control accuracy.

[0006]

According to a first aspect of the present invention, there is provided a generator control device which generates a pulse in accordance with an output of a generator, counts the pulses for a predetermined time, and calculates an average power from the count value. Then, a deviation between the average power and the set value of the power is obtained, the set value is corrected according to the deviation, and the output of the generator is controlled to be constant with the corrected set value as a target value. It was done.

According to a second aspect of the present invention, there is provided a generator control device,
A pulse is generated according to the output frequency of the generator, the pulse is counted for a certain period of time, an average frequency is calculated from the count value, and a deviation between the average frequency and the set value of the frequency is obtained. Thus, the set value is corrected, and the output frequency of the generator is controlled to be constant using the corrected set value as a target value.

[0008] According to a third aspect of the present invention, there is provided a generator control device.
A pulse is generated in accordance with the reactive power of the generator, the pulse is counted for a certain period of time, an average reactive power is calculated from the count value, and a deviation between the average reactive power and the set value of the reactive power is obtained. The set value is corrected according to the deviation, and the reactive power of the generator is controlled to be constant using the corrected set value as a target value.

[0009]

The generator control device according to the first, second, and third aspects of the present invention corrects the set value based on the difference between the set value and the average power, average frequency, or average reactive power calculated by the pulse for a predetermined time. In addition, the control accuracy for adjusting the average power, the average frequency, or the average reactive power within a certain period to a set value is improved, and the error can be drastically reduced.

[0010]

[Embodiment 1] FIG. 1 is a block diagram of a system showing an embodiment of the present invention. Reference numeral 15 denotes a power pulse generation unit that generates a pulse having a frequency according to the detected power amount, 16 denotes a pulse counter unit that counts the number of pulses from the power pulse generation unit 15, 17 denotes a time generation unit that determines the time for counting pulses, Reference numeral 18 denotes an average value calculating unit that calculates the average power based on the pulse count value within the time determined by the time generating unit 17, and 19 denotes a difference between the set value of the power setting unit 11 and the average power value of the average power calculating unit 18. A deviation calculation unit 20 for calculating a correction value calculation unit for calculating a correction value for eliminating a deviation in a certain period thereafter based on the deviation of the deviation calculation unit 19, and a correction value calculation unit 21 set by the power setting unit 11. A correction value adder that adds a correction value calculated by the correction value calculator to the set value and uses the added output as a target value of the comparison calculator;
Is a set value correction unit including 15 to 21.

In FIG. 1, power detecting means is constituted by 2, 3, and 10, and average power calculating means is constituted by 16, 17, and 18. The correction means is constituted by 19, 20, and 21, and the control means is constituted by 13, 9, 8, and 4.

Next, the operation will be described. In the constant power control device 14 configured as described above, the pulse output from the power pulse
And the count value is passed to the average value calculation unit 18. The average value calculation unit 18 calculates the number of pulses within a predetermined time based on the clock signal from the time generation unit 17, and calculates the average power from the number of pulses, the power factor of the power, and the count time.

The difference between the calculated average power and the set value of the power setting unit 11 is calculated by the deviation calculation unit 19. In this calculation, the average power is subtracted from the set value. When the average power is large, the deviation is minus, and when the average power is smaller than the set value, the deviation is plus.

On the basis of the deviation, the correction value calculating section 20 calculates a correction value for correcting the power set value so that the deviation becomes zero within a certain time thereafter. The correction value is added to the power set value by the correction value adding section 21 and output to the comparison operation section 12. The comparison operation unit 12 performs constant power control using the corrected set value as a target value.

That is, when the average power is larger than the set value, the deviation becomes negative and the correction value becomes negative. Therefore, the corrected power set value becomes smaller than the original set value, the power is controlled to be smaller than the previous set value, and the average power can be reduced. By executing this in a predetermined cycle, it is possible to reduce the error between the average power within a certain period and the set value.

Embodiment 2 FIG. Although the power control is described in the first embodiment, the power detection unit 10 in FIG.
The power setting unit 11 is a frequency setting unit, and the power pulse generation unit 15
By replacing each with a frequency pulse generator,
According to the second aspect of the present invention, a constant frequency control device can be realized. In this case, by calculating the average frequency based on the count value of the frequency pulse within a predetermined period, control accuracy of the average frequency can be improved and the error can be reduced in the same manner as described above.

In the case of the constant frequency control device, in FIG. 1, frequency detecting means are constituted by 2, 3, and 10, and average frequency calculating means is constituted by 16, 17, and 18.

Embodiment 3 FIG. FIG. 2 shows a reactive power constant control device according to the third aspect of the present invention, wherein 23 is a reactive power detection unit, 24 is a reactive power setting unit, 25 is an AVR control unit, 26
Denotes a reactive power pulse generator, 27 denotes a constant reactive power control device, and 28 denotes an AVR (automatic voltage regulator). In addition, 1
22 denote the same or corresponding parts as in FIG. In FIG. 2, reactive power detection means is constituted by 2, 3, and 23, average reactive power calculation means is constituted by 16, 17, and 18, and control means is constituted by 25 and.

In the third embodiment shown in FIG. 2, the constant power control is performed by using the set value of the reactive power from the set value correction unit 24 and the number of pulses obtained from the reactive power pulse generation unit 26 in a fixed time. Computes the correction value of the set value, and compares the
In step 2, the deviation from the output of the reactive power detection unit 23 is obtained, and the AVR control unit 25 controls the AVR 28 based on the deviation. Also in this case, the control accuracy of the average reactive power can be improved.

[0020]

As described above, according to the first, second and third aspects of the present invention, a pulse is generated in accordance with the power, frequency or reactive power of the generator, and the pulse is counted for a certain period of time and the count value is obtained. Calculates the average value of power, frequency or reactive power from, calculates the deviation between the average value and the set value, corrects the set value according to the deviation, and uses the corrected set value as the target value to generate power. Since the output, frequency or reactive power of the machine is configured to be controlled to be constant, when the power, frequency or reactive power is managed by the average value in a certain period, the effect of performing highly accurate control can be obtained. can get. In addition, by performing the constant frequency control, it is possible to obtain an effect that a time measurement error of a load such as an electric timepiece can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a generator control device that performs constant power control according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a generator control device for performing constant reactive power control according to one embodiment of the present invention;

FIG. 3 is a configuration diagram illustrating a conventional power constant control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Generator 2 Instrument transformer 3 Instrument current transformer 4 Generator drive 8 Governor device 9 Boiler 10 Power detection unit 12 Comparison operation unit 13 Governor control unit 15 Power pulse generation unit 16 Pulse counter unit 17 Time generation unit 18 Average value calculation unit 19 Deviation calculation unit 20 Correction value calculation unit 21 Correction value addition unit 23 Reactive power detection unit 25 AVR control unit 26 Reactive power pulse generation unit 27 Reactive power constant control device 28 AVR

Claims (3)

(57) [Claims] 1. A power detection means for detecting an output of a generator, a power pulse generation unit for generating a pulse in response to detection by the power detection means, and a pulse generated by the power pulse generation unit being counted for a predetermined time. An average power calculating means for calculating the average power during the predetermined time from the count value; and a deviation between the average power and the set value of the power determined by the average power calculating means. Correction means for correcting the power, a comparison operation part for calculating a deviation between the set value of the power corrected by the correction means and the power detected by the power detection means, and Control means for controlling the output of the generator so as to be the corrected power set value. 2. A frequency detecting means for detecting an output frequency of a generator, a frequency pulse generating section for generating a pulse in response to the detection of the frequency detecting means, and a pulse generated by the frequency pulse generating section for a predetermined time. An average frequency calculating means for counting and calculating an average frequency in the predetermined time from the count value; and obtaining a deviation between the average frequency and the set value of the frequency obtained by the average frequency calculating means, and setting the frequency based on the deviation. Correction means for correcting the value, a comparison operation part for obtaining a deviation between the set value of the frequency corrected by the correction means and the frequency detected by the frequency detection means, and a correction operation part according to the deviation obtained by the comparison operation part. Control means for controlling the output frequency of the generator to be the set value of the corrected frequency. 3. A reactive power detector for detecting reactive power of a generator, a reactive power pulse generator for generating a pulse in response to detection by the reactive power detector, and a pulse generated by the reactive power pulse generator. Average reactive power calculating means for calculating the average reactive power during the fixed time from the count value, and calculating a deviation between the average reactive power calculated by the average reactive power calculating means and the set value of the reactive power. Correction means for correcting the set value of the reactive power based on the deviation; and a comparison operation unit for obtaining a deviation between the set value of the reactive power corrected by the correction means and the reactive power detected by the reactive power detection means. And a control means for controlling the reactive power of the generator to be the set value of the corrected reactive power according to the deviation obtained by the comparison operation unit.