JP2002233195A - Generator control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a mechanical torque providing means of a generator by restricting an excessive input to a governor system for controlling the rotational drive force of the generator. SOLUTION: There are provided at least one of the outputs of an adder 26, which sums an input signal from a rotational speed detecting means 11 for detecting the rotational speed of a generator 2 to a cooperative control means 10, an input signal from an effective power detection means 12 for detecting effective power in the power generated from the generator 2 to the cooperative control means 10, an input signal from a terminal voltage detecting means cooperative control means 18 for detecting terminal voltage of the generator 2 to the cooperative control means 10, an output signal from a torque control means 5 of the cooperative control means 10 to a mechanical torque providing means 3, and an output signal from a permanent variation computation result, based on the difference between a rotational speed setting value 20 of the generator 2 and the detected rotational speed and the torque control means 5 of the cooperative control means 10 to the mechanical torque control means 5 with filters 27, 28, 30, and 31, which apply an output limit of either of deadband elimination or a frequency band elimination, on at least one input signal or an output signal summed by the adder 26.

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, and more particularly to a governor system for adjusting the energy balance between the rotational driving force and the output of the generator, and a power system stabilizing device for stabilizing the dynamics of the power system. The present invention relates to a generator control device for cooperatively controlling the generator.

[0002]

2. Description of the Related Art It is desired that a generator connected to a power system supply stable power under a stable voltage.

In general, a control device for controlling a generator includes a turbine speed control system or a governor system for controlling the rotational force of a turbine rotationally driven by energy such as hydraulic power, steam, gas, etc., in accordance with the output of the generator. And an excitation control system that secures a stable voltage in response to fluctuations in the state of the power system.

FIG. 4 shows such a conventional generator control device, which has a generator governor and a system stabilizing means (hereinafter abbreviated as PSS as necessary) having a configuration as disclosed in Japanese Patent Application Laid-Open No. H11-252998. And cooperative control.

In FIG. 4, a mechanical torque supply means 3 such as a turbine for inputting a mechanical torque to a generator 2 connected to an electric power system 1 and a torque control means 5 such as a governor for controlling the mechanical torque supply means 3 are provided. A generator exciting means 4 for supplying a field current to a stator side field winding of the generator 2, a terminal voltage detecting means 18 for detecting a terminal voltage of the generator 2 and outputting a detection signal thereof, Terminal voltage detecting means 1 of machine 2
A terminal voltage control means (hereinafter abbreviated as AVR) 8 for controlling the terminal voltage inputted from 8 to a predetermined target value 19, and an effective power system 1 to which the power generated by the generator 2 is supplied. A system stabilizing means (hereinafter, if necessary, a stabilizing means for stabilizing the operation of the generator 2 by outputting a correction amount of a predetermined target value of the terminal voltage control means 8 to the adder 13 based on the electric power.
SS).

In the above-described configuration, the cooperative control means 1 including the torque control means 5 and the power system stabilizing means 9
0 is a rotational speed detecting means 1 for detecting the rotational speed of the generator 2.
1; an active power signal output from an active power detecting means 12 for detecting active power from a power output of the generator 2; and a terminal voltage detecting means for detecting a terminal voltage of the generator 2. Terminal voltage signals output from 18 are provided, and the power system stabilizing means 9 and the torque control means 5 are operated in accordance with the fluctuations of the respective high-frequency and low-frequency components of these signals.

That is, the cooperative control means 10 responds to the fluctuation of the high frequency band and the low frequency band of the deviation between the active power and the predetermined set value, and The power system stabilizing means 9 is operated so that the correction amount is provided to the adder 13 assuming that the correction value is a deviation from the terminal voltage target value 19 of the terminal voltage control means 8. Assuming that the change is substantially a change in mechanical torque, the torque control means 5 is operated so as to suppress the change in the substantial mechanical torque.
And the power system stabilizing means 9 in a coordinated manner.

[0008] Such a cooperative control means 10 operates the governor control and the excitation control in a cooperative manner to provide a conventional PS.
In S and governor control, the continuous oscillation and divergence of the steam flow rate and the generator voltage due to the interference between the two control operations that occur when the governor control is accelerated to respond to the power fluctuation are prevented.

As a result, the governor control can be sped up, so that it is possible to improve the damping capability for long-period power fluctuations, for which the excitation control by the PSS has not been able to provide sufficient power. Since excess or deficiency of the energy of the generator can be quickly compensated, it is effective for securing the transient stability. Moreover, A
Since a VR of a conventional control device can be used as the VR, the voltage maintenance speed does not deteriorate, which is convenient for stabilizing the power system.

[0010]

However, although the above-described cooperative control means 10 has a selection characteristic depending on the frequency component of the signal to be detected, it is difficult to detect white noise such as sensor noise, or to scrape the generator shaft. There is a problem that a small but steady signal is output for colored noise or the like whose motion is detected by the rotation number detecting means 11 and the mechanical torque supplying means 3 operates.

In a large-scale accident, the detection signal fluctuates greatly, and the cooperative control means 10 outputs a large signal.
This has a problem in protecting the turbine and the boiler of the mechanical torque supply means 3.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to limit a steady or excessive input to a governor system for adjusting a rotational driving force of a generator so as to supply a mechanical torque to the generator. It is an object of the present invention to provide a generator control device capable of protecting the means.

[0013]

In order to achieve the above object, the present invention constitutes a generator control device by the following means.

According to a first aspect of the present invention, a torque change instruction value is obtained by a stabilization rate calculator based on a deviation between a set value of the number of revolutions of the generator and the number of revolutions of the generator, and a mechanical torque is applied to the generator. Mechanical torque supplying means for supplying a magnetic field, a torque control means for controlling the mechanical torque, a generator exciting means for supplying a field to the generator, and a terminal voltage of the generator so as to be a predetermined target value. A terminal voltage control unit that controls the generator excitation unit, and outputs a correction amount for correcting the target value of the terminal voltage control unit to output an active power of a power system to which power generated by the generator is supplied. In a generator control device comprising a power system stabilizing means for controlling,
Rotation speed detection means for detecting the rotation speed of the generator, active power detection means for detecting the active power of the power generated by the generator, and terminal voltage detection means for detecting the terminal voltage of the generator A detection signal from each of these detection means is input, and a high-frequency band of the frequency component is changed according to a variation of each of a high-frequency component and a low-frequency component with respect to a deviation between the active power signal and a predetermined set value. The power system stabilizing means is operated so as to give the correction amount as a deviation of the target value of the terminal voltage control means with respect to the fluctuation of the terminal voltage control means. In this case, it is assumed that the fluctuation is substantially the fluctuation of the mechanical torque, and the torque control means is operated so as to suppress the fluctuation of the substantial mechanical torque. A coordination control unit that cooperatively controls the power system stabilization unit and the torque control unit, and performs at least one process of output limitation, dead zone, and frequency band removal on an output signal of the torque control unit. One filter is provided.

According to the generator control device having such a configuration, the cooperative control means is capable of steadily responding to white noise such as sensor noise and colored noise in which the rotational speed detecting means detects the rubbing motion of the generator shaft. The governor control and the excitation control are cooperatively operated without mechanically operating the mechanical torque supply means, and the mechanical torque supply means is not excessively operated at the time of a large-scale accident, so that the turbine, the boiler, and the like can be protected.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a generator control device according to the present invention.
FIG. 4 is a block diagram showing an embodiment of the present invention, and the same components as those in FIG.

As shown in FIG. 1, a generator control device according to the first embodiment generates a power and supplies the power to a power system 1, and a mechanical torque that supplies a mechanical torque to the power generator 2. Supply means 3; torque control means 5 for controlling the mechanical torque supply means 3; generator excitation means 4 for flowing a field current through the field winding of the generator 2; Terminal voltage detecting means 18 for controlling the terminal voltage of the generator 2 to be a predetermined target value, and a terminal voltage control means 8 such as an AVR for controlling the terminal voltage of the generator 2 to a predetermined target value. A power system stabilizing unit 9 such as a PSS that provides the adder 13 with a correction amount of the target value 19 of the terminal voltage control unit 8 based on the active power of the system 1.

In the generator control device having the basic configuration as described above, a rotation speed detecting means 11 for detecting the rotation speed of the generator 2 and outputting a rotation speed signal to the mechanical torque supply means 3.
An active power detecting means 12 for detecting active power of the power generated by the generator 2 and outputting an active power signal; a torque control means 5 and a power system stabilizing means 9; , The active power detection signal detected by the active power detection means 12 and the terminal voltage detection signal detected by the terminal voltage detection means 18 to obtain the torque control means 5 and the power system stabilization. A coordination control means 10 for cooperatively controlling the means 9 is provided.

Here, the coordination control means 10 responds to the variation of the high frequency band and the low frequency component of the deviation between the active power and the predetermined set value with respect to the variation of the high frequency band of the frequency component. In this case, the power system stabilizing means 9 is operated so as to supply the correction amount to the adder 13 assuming that the deviation is a deviation from the terminal voltage target value 19 of the terminal voltage control means 8, and the variation of the frequency component in the low frequency band In contrast, by assuming that the fluctuation is substantially a fluctuation of the mechanical torque, the torque control means 5 is operated so as to suppress the fluctuation of the substantial mechanical torque. It controls the coordination means 9 cooperatively.

The mechanical torque supply means 3 compares the rotational speed set value 20 with a rotational speed detection signal of the turbine 34 detected by the rotational speed detecting means 11, and inputs a deviation thereof to a setting rate calculating section. 23, the torque control signal input from the torque control means 5 is added to the change instruction value due to the governor-free operation obtained by the adjustment rate calculation unit 23, and the load set value set in the load setter 22 is added. The controller controls the control valve 32 provided in the steam supply system that supplies the main steam 32 to the turbine 34.

Reference numeral 24 denotes a selection unit for selecting either the load limiting operation or the governor operation. When the turbine 34 is operated by limiting the load without relying on the mechanical torque control, the selection unit 24 performs the load control. By selecting the limit setter 21, the control valve 33 is controlled by the load set value.

In the generator control device having such a configuration, the first filter 27 is provided in the output system of the torque control means 5 of the cooperative control means 10. This first filter 2
Reference numeral 7 has an output limiting function and a dead zone setting function, which eliminates a steady small operation to prevent mechanical wear of the governor and prevents an excessive input change instruction value from entering the mechanical torque supply system. I have.

Further, at least one processing function of output limitation, dead zone, and frequency band elimination is provided in the output system of the addition signal of the output of the adjustment rate calculation unit 23 and the torque control signal input through the first filter 27 at the same time. By providing a second filter 28 having a function of limiting the total of the change instruction value by the bana-free operation 23 and the torque control instruction value of the torque control means 5 obtained by the adjustment rate calculation unit 23,
Protects governors and turbines from wear due to small movements.

As described above, in the first embodiment, the output of the first filter 27 having the limiter function and the dead zone setting function in the output system of the torque control means 5 of the coordination control means 10 and the output of the adjustment rate calculation unit 23 The output system of the addition signal with the torque control signal input through the first filter 27 is provided with a second filter 28 having at least one processing function of output limitation, dead zone, and frequency band elimination. Since the torque change instruction value output from the control means 5 is limited, an excessive input change is not input to the turbine even during a large-scale accident, and the boiler is not adversely affected. This prevents the turbine and the boiler from being provided.

In addition, since a small stationary signal due to white noise such as sensor noise or colored noise detected by the rotation speed detecting means 11 by the rotation of the generator shaft is a dead zone operation, unnecessary operation of the governor is performed. Is eliminated, and mechanical consumption of the governor can be prevented.

In the first embodiment, when the output signal of the adjustment rate calculator 23 exceeds the range of the output limit of the second filter 28, the output of the first filter 27 is turned off by the torque control means 5. You may make it a state.

FIG. 2 shows a second embodiment of the generator control device according to the present invention.
In the block diagram showing the embodiment, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. Different portions will be described here.

In the second embodiment, as shown in FIG. 2, the input system of the coordination control means 10 to which the rotation speed detection signal of the generator 2 detected by the rotation speed detection means 11 is input, the active power detection means The input system of the coordination control means 10 to which the active power signal of the power generation output of the generator 2 detected by 12 is input, and the coordination control means 10 to which the terminal voltage of the generator 2 detected by the terminal voltage detection means 18 is input 3rd input system
Are provided, respectively.

Each of the third filters 29 to 31 has at least one processing function of output limitation, dead zone, and frequency band elimination.

As described above, in the second embodiment, the third filters 29, 30 are provided in the input system of the coordination control means 10 inputted from the rotation speed detecting means 11, the active power detecting means 12, and the terminal voltage detecting means 18. , 31 are provided, and these filters are provided with at least one processing function of output limitation, dead zone, and frequency band elimination. The governor control system and the excitation control system can be operated cooperatively without constantly operating the mechanical torque supply means 3 against colored noise or the like which detects and outputs motion.

Further, since the mechanical torque supply means 3 is not operated excessively at the time of a large-scale accident, an excellent effect for protecting a turbine, a boiler and the like is exhibited.

In the second embodiment, in addition to the first filter 27 and the second filter 28 described in the first embodiment, input is made from each of the detection means 11, 12, and 18. The third filter 2 is provided in the input system of the cooperative control means 10.
Although the case where 9, 30, 31 is provided has been described, any one or two of these filters 29 to 31 may be provided, and the first filter 27 and the second filter 28 are not provided. , Only the third filters 29 to 31 may be provided.

FIG. 3 shows a third embodiment of the generator control device according to the present invention.
In the block diagram showing the embodiment, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. Different portions will be described here.

In the third embodiment, as shown in FIG. 3, the mechanical torque supply means 3 converts the flow rate of the water flowing into the water turbine 37 into the water turbine 37 through the water passage 35 and the water turbine 37 for supplying the mechanical torque to the generator 2. And a guide vane 36 to be adjusted.

In such a hydroelectric generator, noise is superimposed on the rotational speed signal which is the output signal of the rotational speed detecting means 11 for detecting the rotational speed of the generator 2 due to the swiveling motion of the generator shaft.

In the third embodiment, as in the first embodiment, a first filter 27 having a limiter function and a dead zone setting function in the output system of the torque control means 5 of the cooperative control means 10 and a setting rate calculation. A second filter 28 having at least one processing function of output limitation, dead band, and frequency band elimination is provided in an output system of an addition signal of the output of the unit 23 and the torque control signal input through the first filter 27, From the rotational speed detecting means 11 to the cooperative control device 10
A third filter 29 is provided in the input system of the rotational speed signal input to the
Is provided.

The third filter 29 has a frequency band removing function and a dead band setting function. As a result, it is possible to remove the stationary noise peculiar to the rotation speed signal of the generator and prevent the governor from being mechanically worn.

[0039]

As described above, according to the generator control apparatus of the present invention, white noise such as sensor noise and colored noise in which the rotational speed detecting means detects the swirling motion of the generator shaft are eliminated. The governor control and the excitation control can be cooperatively operated without constantly operating the mechanical torque supply means. In addition, since the mechanical torque supply means is not operated excessively at the time of a large-scale accident, an excellent effect is provided for protection of a turbine, a boiler, and the like.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a generator control device of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the generator control device of the present invention.

FIG. 3 is a block diagram showing a third embodiment of the generator control device of the present invention.

FIG. 4 is a block diagram showing a configuration example of a conventional generator control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Power system 2 ... Generator 3 ... Mechanical torque supply means 4 ... Generator excitation means 5 ... Torque control means 8 ... Terminal voltage control means (AVR) 9 ... Power system stabilization means (PSS) 10 ... Cooperation control means 11 ... Rotation speed detecting means 12 ... Active power detecting means 13 ... Adder 18 ... Terminal voltage detecting means 27,28 ... First filter, second filter 29-31 ... Third filter

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Choei Takahashi 7-2-1, Nakayama, Aoba-ku, Sendai, Miyagi Prefecture Tohoku Electric Power Co., Inc. (72) Inventor Hiromichi Sato 7-2, Nakayama, Aoba-ku, Sendai, Miyagi Prefecture No. 1 Tohoku Electric Power Co., Inc. (72) Inventor Norifumi Mitsumoto 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Toshiba Fuchu Office Co., Ltd. Inside the business office (72) Inventor Shigeru Koshida 1-1-1, Shibaura, Minato-ku, Tokyo Inside the Toshiba head office (72) Inventor Hiroshi Uemura 1-1-1, Shibaura, Minato-ku, Tokyo Toshiba head office Office (72) Inventor Kazutaro Shinohara 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation Fuchu Office F-term (reference) 5H590 AA01 AA11 AA13 AB03 BB02 BB 17 CA01 CA11 CC01 CE01 DD01 DD64 DD66 EA07 EA11 EA14 EB02 EB21 FA01 FA06 GA02 GA05 GA06 HA02 HA06 HA27 HB02 HB03 JA05 JA08 JA19 JB15 JB18

Claims (5)

[Claims] 1. A mechanical torque supply means for obtaining a torque change instruction value by a stabilization rate calculator based on a deviation between a set value of a rotation speed of a generator and a rotation speed of the generator and supplying a mechanical torque to the generator. And torque control means for controlling the mechanical torque; generator excitation means for supplying a field to the generator; and controlling the generator excitation means so that a terminal voltage of the generator becomes a predetermined target value. Terminal voltage control means, and a power system stabilizing means for outputting a correction amount for correcting the target value of the terminal voltage control means to control active power of a power system to which power generated by the generator is supplied. A generator control device comprising: a rotation speed detection unit that detects a rotation speed of the generator; an active power detection unit that detects an active power of power generated by the generator; and Terminal voltage A terminal voltage detecting means for detecting detection signals from the respective detecting means are respectively input,
And, according to the variation of each of the high frequency and low frequency of the deviation between the active power signal and a predetermined set value, the target of the terminal voltage control means is controlled with respect to the variation of the high frequency band of the frequency component. The power system stabilizing means is operated so as to give the correction amount as a value deviation, and the fluctuation is substantially equal to the fluctuation of the mechanical torque with respect to the fluctuation of the low frequency band of the frequency component. By operating the torque control means so as to suppress the substantial fluctuation of the mechanical torque,
A first control unit that includes a coordination control unit that controls the power system stabilization unit and the torque control unit in a cooperative manner, and performs at least one process of output limitation, dead band, and frequency band removal on an output signal of the torque control unit.
A generator control device comprising: a filter; 2. The generator control device according to claim 1, wherein the mechanical torque supply unit includes an output limit, a dead zone, and an output signal of the torque control unit and an output signal of the adjustment rate calculator. A generator control device comprising a second filter for performing at least one process of frequency band removal. 3. The power generation control device according to claim 2,
When the output signal of the arbitration rate calculator exceeds a range of the output limit of the second filter,
A generator control device, wherein the output of the first filter is turned off. 4. A mechanical torque supply means for obtaining a torque change instruction value by a stabilization rate calculator based on a deviation between a set number of revolutions of the generator and a number of revolutions of the generator, and supplying a mechanical torque to the generator. And torque control means for controlling the mechanical torque; generator excitation means for supplying a field to the generator; and controlling the generator excitation means so that a terminal voltage of the generator becomes a predetermined target value. Terminal voltage control means, and a power system stabilizing means for outputting a correction amount for correcting the target value of the terminal voltage control means to control active power of a power system to which power generated by the generator is supplied. A generator control device comprising: a rotation speed detection unit that detects a rotation speed of the generator; an active power detection unit that detects an active power of electric power generated by the generator; Terminal voltage And a detection signal from each of these detection means, respectively.
And, according to the variation of each of the high frequency and low frequency of the deviation between the active power signal and a predetermined set value, the target of the terminal voltage control means is controlled with respect to the variation of the high frequency band of the frequency component. The power system stabilizing means is operated so as to give the correction amount as a value deviation, and the fluctuation is substantially equal to the fluctuation of the mechanical torque with respect to the fluctuation of the low frequency band of the frequency component. By operating the torque control means so as to suppress the substantial fluctuation of the mechanical torque,
A cooperative control means for cooperatively controlling the electric power system stabilizing means and the torque control means; a rotational speed signal of the generator detected by the rotational speed detecting means input to the cooperative control means; A third filter for applying at least one process of output limitation, dead band, and frequency band removal to at least one of the active power signal detected by the power detection unit and the terminal voltage signal detected by the terminal voltage detection unit; A power generation control device, comprising: 5. The generator control device according to claim 4, wherein said cooperative control means includes a first filter for applying at least one processing of output limitation, dead band, and frequency band removal to an output signal of said torque control means. The mechanical torque supply means outputs a signal obtained by adding an output signal of the torque control means and an output signal of the stabilization rate calculator to an added signal, a dead zone,
A generator control device comprising a second filter for performing at least one process of frequency band removal.