JPH04368500A - Generator controller - Google Patents

Abstract

PURPOSE:To obtain a generator controller which can control average value of power, frequency or reactive power with high accuracy. CONSTITUTION:A power generating section 15 generates pulses according to power detected through a voltage transformer 2 and an instrument current transformer 3. Thus generated pulses are counted through a counter 16 and an average value operating section 18 operates an average value of power, according to the count of pulse, which is then compared with a set value at a difference operating section 19 thus obtaining a difference. A correction value operating section 20 operates a correction value corresponding to the difference and the corrected value is employed, as a target value, in the determination of difference from a power detected at a power detecting section 10. Thus determined difference is employed in the control of a governor control section 13 for controlling the output of a generator 1 to the target value. According to the invention, control error of average power during a predetermined interval can be suppressed.

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, etc. 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 the figure, 1 is a generator that generates AC power, 2 is a voltage transformer that detects voltage, and 3 is a power transformer that detects voltage. 4 is a generator drive machine; 5 is a power system as a load; 6 is a connection breaker connected to the power system 5; 7 is a generator breaker connected to the generator 1;
8 is a governor device that adjusts the output of the generator drive machine 4; 9 is a boiler that supplies steam to the generator drive machine 4; 10 is a voltage and current detected by the instrument transformer 2 and the instrument current transformer 3; A power detection unit that detects power; 11 a power setting unit that sets a target value to control power to a constant level; 12 a power detection unit 1;
a comparison calculation unit that compares the power value detected at 0 and a set value determined by the power setting unit 11 and calculates the deviation;
3 is a governor control unit that generates an output increase/decrease signal to the governor device 8 based on the deviation signal of the comparison calculation unit 12; 14 is comprised of a power detection unit 10, a power setting unit 11, a comparison calculation unit 12, and a governor control unit 13; It is a constant power control device.

Next, the operation will be explained. The constant power control device 14 is in a controllable state when both the generator breaker 7 and the communication breaker 6 are turned on. Based on the voltage and current from the power system 5 detected by the instrument transformer 2 and the instrument current transformer 3, the power detection unit 10 detects the power flowing in from the power system 5. The detected electric power is compared with a value set in advance by the power setting section 11 in the comparison calculation section 12, and a deviation signal thereof is received by the governor control section 13. If the detected power is larger than the set value, an output increase signal is output to the governor device 8, and conversely, if the detected power is smaller than the set value,
Outputs an output reduction signal to the governor device 8. As a result, the generator 1
Adjust the output of

0004

[Problems to be Solved by the Invention] Conventional power constant control devices are configured to control power based on the instantaneous power detected as described above. When power management is performed using an average power value, there is a problem in that control errors become large in order to control the average power to a constant value. Similarly, regarding frequency and reactive power,
There were problems such as large control errors when managing using average values over a certain period of time.

[0005] This invention was made in order to solve the above-mentioned problems, and it is possible to make the difference between the average value of power, frequency or reactive power over a certain period of time and a set value so small that it can be ignored.
The purpose of this invention is to obtain a generator control device that can improve control accuracy.

[0006]

[Means for Solving the Problem] A generator control device according to the invention of claim 1 generates pulses according to the output of a generator, counts these pulses for a certain period of time, and calculates an average power from the counted value. Then, the deviation between this average power and the power set value is determined, the above set value is corrected according to this deviation, and the output of the generator is controlled to be constant using this corrected set value as the target value. This is what I did.

[0007] The generator control device according to the invention of claim 2 includes:
Generate pulses according to the output frequency of the generator, count these pulses for a certain period of time, calculate the average frequency from the counted value, calculate the deviation between this average frequency and the frequency setting value, and calculate the deviation according to this deviation. The set value is corrected using the set value, and the output frequency of the generator is controlled to be constant using the corrected set value as a target value.

[0008] The generator control device according to the invention of claim 3 includes:
Generate pulses according to the reactive power of the generator, count these pulses for a certain period of time, calculate the average reactive power from the counted value, and then calculate the deviation between this average reactive power and the set value of the reactive power. 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]

[Operation] The generator control device according to the invention of claims 1, 2, and 3 corrects the set value based on the difference between the set value and the average power, average frequency, or average reactive power calculated using pulses for a predetermined time. The control accuracy for adjusting the average power, average frequency, or average reactive power within a certain period to a set value is improved, and errors can be dramatically reduced.

0010

[Example] Example 1. FIG. 1 is a block diagram of a system showing an embodiment of the present invention, and numerals 1 to 14 indicate the same or equivalent parts as those of the conventional device shown in FIG. Reference numeral 15 denotes a power pulse generation section that generates pulses of a frequency according to the amount of detected electric power, 16 a pulse counter section that counts the number of pulses from the power pulse generation section 15, 17 a time generation section that determines the time for counting pulses, Reference numeral 18 denotes an average value calculation unit that calculates the average power based on the pulse count value within the time determined by the time generation unit 17, and 19 calculates the difference between the set value of the power setting unit 11 and the average power value of the average power calculation unit 18. A deviation calculation section 20 calculates a correction value for eliminating the deviation at a certain fixed time thereafter based on the deviation of the deviation calculation section 19; 21 a correction value calculation section that calculates the correction value set by the power setting section 11 A correction value addition section 22 is a set value correction section including 15 to 21, which adds the correction value calculated by the correction value calculation section 20 to the set value and uses the added output as the target value of the comparison calculation section 12.

In FIG. 1, 2, 3, and 10 constitute a power detection means, and 16, 17, and 18 constitute an average power calculation means. Further, 19, 20, and 21 constitute a correction means, and 13, 9, 8, and 4 constitute a control means.

Next, the operation will be explained. In the constant power control device 14 configured as described above, the pulses output from the power pulse generation section 15 are input to the pulse counter section 16.
and passes the count value to the average value calculation section 18. The average value calculation section 18 calculates the number of pulses within a certain period of time based on the clock signal from the time generation section 17, and calculates the average power from the number of pulses, the power multiplication factor, and the count time.

A deviation calculation unit 19 calculates the difference between the calculated average power and the set value of the power setting unit 11. In this calculation, the average power is subtracted from the set value, and when the average power is large, the deviation is negative, and when the average power is smaller than the set value, the deviation is positive.

Based on this deviation, the correction value calculating section 20 calculates a correction value for correcting the power setting value so that the deviation becomes zero within a certain period of time thereafter. The correction value is added to the power setting value by the correction value addition section 21 and outputted to the comparison calculation section 12 . The comparison calculation unit 12 performs constant power control using the corrected setting value as a target value.

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

Example 2. In the first embodiment described above, power control was shown, but the power detection section 10 in FIG. 1 is replaced by a frequency detection section,
The power setting section 11 is a frequency setting section, and the power pulse generation section 15 is
By replacing each with the frequency pulse generator,
A constant frequency control device according to the invention of claim 2 can be realized. In that case, by calculating the average frequency based on the count value of the frequency pulse within a predetermined period, it is possible to improve the control accuracy of the average frequency and reduce the error in the same manner as described above.

In the case of a constant frequency control device, in FIG. 1, 2, 3, and 10 constitute a frequency detection means, and 16, 17, and 18 constitute an average frequency calculation means.

Example 3. FIG. 2 shows a constant reactive power control device according to the invention of claim 3, in which 23 is a reactive power detection section, 24 is a reactive power setting section, 25 is an AVR control section, and 26 is a reactive power constant control device.
27 is a reactive power constant control device, and 28 is an AVR (automatic voltage regulator). In addition, 1~
Reference numeral 22 indicates the same or equivalent portion as in FIG. Further, in FIG. 2, 2, 3, and 23 constitute a reactive power detection means, 16, 17, and 18 constitute an average reactive power calculation means, and 25, 28 constitute a control means.

In the third embodiment shown in FIG. 2, the set value of the reactive power from the set value correcting section 24 and the number of pulses obtained in a certain period of time from the reactive power pulse generating section 26 are used to perform constant power control in the same way as the constant power control. Calculate the correction value of the set value and compare
2, the deviation from the output of the reactive power detection section 23 is determined, and the AVR control section 25 controls the AVR 28 based on this deviation. In this case as well, the control accuracy of the average reactive power can be improved.

[0020]

As described above, according to the invention of claims 1, 2, and 3, pulses are generated according to the power, frequency, or reactive power of the generator, and the pulses are counted for a certain period of time and the count value is calculated. Calculate the average value of power, frequency, or reactive power from Since the system is configured to control the output, frequency, or reactive power of the machine at a constant level, it is possible to perform extremely accurate control when managing the power, frequency, or reactive power using average values over a certain period of time. can get. Moreover, by performing constant frequency control, effects such as being able to reduce the time measurement error of a load such as an electric clock, etc., can be obtained.

[Brief explanation of drawings]

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

FIG. 2 is a configuration diagram showing a generator control device that performs constant reactive power control according to an embodiment of the invention of claim 2;

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

[Explanation of symbols]

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

Claims (3)

[Claims] 1. A power detection means for detecting the output of a generator, a power pulse generation section for generating pulses in response to detection by the power detection means, and a pulse generated by the power pulse generation section for counting at a certain time. An average power calculation means for calculating the average power over the certain period of time from the count value of the shiso, and a deviation between the average power calculated by the average power calculation means and the power setting value, and based on this deviation, the above power setting value. a correction means for correcting the power setting value, a comparison calculation section for calculating the deviation between the power set value corrected by the correction means and the power detected by the power detection means, A generator control device comprising: control means for controlling the output of the generator to the corrected power setting value. 2. Frequency detection means for detecting the output frequency of a generator; a frequency pulse generation section for generating pulses in response to detection by the frequency detection means; and a frequency pulse generation section for generating pulses at a constant time. an average frequency calculation means that counts and calculates the average frequency over the certain period of time from the counted value; and a deviation between the average frequency obtained by the average frequency calculation means and the set value of the frequency, and the setting of the frequency based on this deviation. a correction means for correcting the value; a comparison calculation section for calculating the deviation between the frequency setting value corrected by the correction means and the frequency detected by the frequency detection means; A generator control device comprising: control means for controlling the output frequency of the generator to the corrected frequency setting value. 3. Reactive power detection means for detecting reactive power of a generator, a reactive power pulse generation section for generating pulses in response to detection by the reactive power detection means, and pulses generated by the reactive power pulse generation section. average reactive power calculating means for counting the average reactive power over a certain period of time and calculating the average reactive power for the certain period from the counted value, and calculating the deviation between the average reactive power calculated by the average reactive power calculating means and the set value of the reactive power. a correction means for correcting the set value of the reactive power based on the deviation; and a comparison calculation unit for calculating the deviation between the set value of the reactive power corrected by the correction means and the reactive power detected by the reactive power detecting means. and a control means for controlling the reactive power of the generator so that it becomes the corrected reactive power setting value according to the deviation determined by the comparison calculation section.