JP2009189196A - Duplexing system for automatic voltage control unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable switching in shockless manner by providing a slave state for such a period of time in which a field current is correctly input after occurrence of switching. <P>SOLUTION: An AVR-1(A system unit)41, among the AVR-1(A system)41 and an AVR-2(B system unit)42, includes a CPU calculation part 41a, a field current detecting part 41b, an IGBT control part 41c and the like. The AVR-2(B system unit)42 includes a CPU calculation part 42a, a field current detecting part 42b, an IGBT control part 42c and the like. The outputs of IGBT control parts 41c and 42c are supplied to an exciting part 47 of a generator from magnet SW45 and magnet SW46 through shunts 43 and 44. DI signal input parts 48 and 49 supply a master/slave switching control signal to the AVR-1(A system)41 and the AVR-2(B system unit)42. A switching part 50 performs setting and resetting of the duplexed AVR-1 and AVR-2 as well as switching of the magnet SW45 and magnet SW46, while switching of AVR is performed with the switch 50. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a digital automatic voltage control device for a turbine generator, and more particularly to a duplex processing device for a digital automatic voltage control device for a generator.

  A control block configuration as shown in FIG. 8 is used for an automatic voltage control device for a turbine generator. In FIG. 8, reference numeral 1 denotes a turbine (T), and a field current is supplied to an excitation winding of a generator 2 driven by the turbine 1 by an excitation device 3 including a thyristor control unit.

  Reference numeral 4 denotes a digital automatic voltage control device (hereinafter referred to as AVR). The AVR 4 converts the generator voltage detected by the transformer PT into a digital signal by the A / D converter 5 and an effective value converter (not shown). Is converted into an effective value by adjusting the phase advance / delay by the power fluctuation stabilizing device 6, and the deviation from the voltage setting device 7 consisting of 90 R is obtained by the deviation device 8, and then the deviation is subjected to voltage control calculation with a limiter. The unit (first LPI) 9 performs a proportional integration (PI) calculation to obtain a field current command.

  The changeover switch 10 switches the field current command from the first LPI 9 and the field current command from the 70E field current setter 11. Reference numeral 12 denotes an A / D converter that detects a field current If supplied from the excitation device 3 to the excitation winding of the generator 2, and this A / D converter 12 digitally detects the detected current from the current transformer CT. The signal is converted into a signal, and the field current command and the field current If converted into a digital signal are supplied to the deviation unit 13.

  The deviation between the field current command and the field current If is obtained by the deviation unit 13, and the deviation is proportional-integral (PI) computed by the limiter-equipped field current control computation unit (second LPI) 14. This calculation result is converted into an analog signal by the D / A converter 15 and used as an excitation control signal for a gate circuit (not shown), and the phase control of the thyristor of the excitation device 3 is performed by the gate circuit.

  In the above configuration, the selector switch 10 is set to the field current setter 11 side to perform the initial excitation of the generator 2, and then the selector switch 10 is switched to the first LPI 9 side to perform automatic voltage control of the generator 2. The field current is automatically controlled so that the generated voltage of the generator 2 matches the set voltage (rated voltage) of the voltage setter 7 (see Patent Document 1).

  Further, a control device for a hydropower plant includes a generator excitation control device and a speed control device, and the excitation control device constitutes a duplex control device including a master side control unit and a slave side control unit. This device always transmits the control amount and the current amount of internal data of the master side control unit to the slave side control unit, and when the master side control unit fails, it switches to the slave side control unit and continues control. (See Patent Document 2).

Furthermore, there is an apparatus shown in FIG. 9A in which the AVR 4 is duplicated in the apparatus shown in FIG. This apparatus has a master side AVR-1 and a slave side AVR-2, and a current command adopts a system in which AVR-1 and AVR-2 are switched by a magnet SW with a serious failure signal. In this apparatus, the field current detection unit of the excitation device ACEX is provided separately, and the field current is input to each of the AVR-1 and AVR-2. For this reason, even if switching from AVR-1 to AVR-2 occurs, switching without shock is possible.
JP-A-11-150994 JP 09-285196 A

  However, in the AVR duplex processing apparatus shown in FIG. 9 (a), the field current detection unit is separately installed, so that switching of the apparatus is shockless. However, the field current as shown by the cross in FIG. 9 (b) is shown. When a failure occurs in the detection unit, the field current is not supplied to AVR-1 and AVR-2. For this reason, there is a problem that the merit of duplexing AVR is lost, the current command greatly fluctuates, and switching is impossible even in a shockless manner.

  In addition, as shown in FIG. 10, for data exchange between the master side AVR-1 and the slave side AVR-2, the RS232C is used to transmit the current calculation results etc. operating on the master side to the slave side ( (Data update interval: 300 mS). Because of this configuration, the slave side performs the reverse operation, receives data from the master side, and performs processing to match the 90R set value and the first and second LPI calculation integral terms. In some cases, stable switching was not possible.

  In addition, since the processing on the slave side only matches the 90R set value and the first and second LPI calculation integration terms with the data received from the master side, the voltage establishment control is performed based on the voltage transition state when switching occurs. There is a problem that stable voltage control cannot be performed at the time of (FIG. 11) and the load cutoff process (FIG. 12).

  The present invention has been made in view of the above circumstances, and enables switching without shock so that the current command is almost the same as that of the master before switching, and also enables stable control by suppressing voltage fluctuation. It is an object of the present invention to provide a dual processing apparatus for an automatic voltage control apparatus.

In order to achieve the above object, the present invention provides a voltage control calculation unit that obtains a field current command by a proportional integral calculation of a deviation between a detection voltage of a turbine generator and a set value of a voltage setter, An automatic voltage control device comprising a field current control calculation unit that controls a field current of the generator according to a proportional integral calculation of a deviation between the field current command and the detected field current value of the generator. There,
The automatic voltage controller is configured as a master / slave duplexer. Data is exchanged between both automatic voltage controllers via serial communication, and a control loop is started with the data. Voltage control of the slave automatic voltage controller is performed. The proportional integral calculation term of the calculation unit is a field current value.

  The second invention is characterized in that the setting of the extraction of data used in the automatic voltage control device on the slave side can be changed.

According to a third aspect of the present invention, there is provided a voltage control calculation unit for obtaining a field current command by a proportional integral calculation of a deviation between a detected voltage of the turbine generator and a set value of the voltage setter, the field current command and the field current of the generator. An automatic voltage control device comprising a field current control calculation unit that controls a field current of the generator according to a proportional integration calculation with a deviation from a detected value,
The automatic voltage controller is configured as a master / slave duplexer. Data is exchanged between both automatic voltage controllers via serial communication, and the control loop is started with that data. This automatic voltage control device is characterized in that the field current detection set time is a slave operation and the set time can be changed.

According to a fourth aspect of the present invention, there is provided a voltage control calculation unit for obtaining a field current command by a proportional integral calculation of a deviation between a detection voltage of the turbine generator and a set value of the voltage setter, the field current command and the field current of the generator. An automatic voltage control device comprising a field current control calculation unit that controls a field current of the generator according to a proportional integration calculation with a deviation from a detected value,
The automatic voltage control device is configured as a master / slave duplexer, and a master / slave determination processing unit is provided to select and use both automatic voltage control devices. In this determination processing, either voltage establishment control or load cutoff control is processed. A type determination processing unit is provided, and processing is executed according to the result of the processing type determination.

  According to a fifth aspect of the present invention, when the processing type determination processing unit determines that the voltage establishment control is being performed, the output of the field current control calculation unit is set as a set value.

  A sixth aspect of the invention is characterized in that when the processing type determination processing unit performs a determination process at the time of load shedding control, the output of the field current control calculation unit is substantially “0”.

  According to the present invention, after the switching occurs, by setting the slave state for a time period during which the field current can be normally input, the current command becomes almost the same as that on the master side before switching, so that switching can be performed without shock. .

  Also, depending on the failure on the master side, if the current value sent from the master side is used, there is a possibility of shocking, so stable control can be performed by setting the data to be used before the set time. it can.

  Furthermore, when switching from the slave side to the master side, voltage fluctuations can be suppressed during normal voltage control, large voltage fluctuations can be suppressed during voltage establishment control, and rated voltage control is possible. There is an advantage that the voltage can be suppressed quickly and the rated voltage can be controlled.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a digital AVR device. In FIG. 1, 21 is a CPU calculation unit comprising AVR 4 shown in FIG. 8, 22 is an excitation device comprising an IGBT control unit, and 23 is a power source including a field current detection unit. Reference numeral 24 denotes a generator excitation part.

  As shown in FIG. 1, the digital AVR device has a configuration in which a field current detection unit is also incorporated. For this reason, the first embodiment of the present invention comprises an AVR-1 (A system unit), an AVR-2 (B system unit), and a magnet SW as shown in FIG. When the magnet SW is AVR-1 (A system unit), a slave signal is input to AVR-2 (B system unit).

  When operating with AVR-1 (A system unit), the field current detection value of AVR-2 (B system unit) is "0", so the control system is open loop, and control is performed. It is impossible.

  When switching to AVR-2 (B system unit) occurs in this state, the current command of AVR-2 (B system unit) becomes the maximum output, causing a large fluctuation in the generator voltage. However, in the first embodiment, the slave side inputs 90R, 70E, field current value, and integral term at a cycle of 100 mS by serial communication from the master side, and starts the control loop with the input data. .

  In addition, since the field current detection values of both systems at the time of switching are as shown in FIG. 3, the field current is held for a set time after the switching occurs.

  4 is a specific block diagram when the AVR apparatus shown in FIG. 2 is duplicated. In FIG. 4, reference numerals 41 and 42 denote AVR-1 (A system unit: master) and AVR-2 (B system unit). AVR-1 (A system unit) 41 includes a CPU calculation unit 41a, a field current detection unit 41b, an IGBT control unit 41c, and the like, and an AVR-2 (B system unit) 42 includes a CPU calculation unit 42a. The field current detection unit 42b, the IGBT control unit 42c, and the like.

  The outputs of the IGBT control units 41 c and 42 c are supplied from the magnet SWs 45 and 46 to the generator excitation unit 47 via the shunts 43 and 44. Reference numerals 48 and 49 denote DI signal input units for supplying a master / slave switching control signal to the AVR-1 (A system unit) 41 and AVR-2 (B system unit) 42, respectively. Reference numeral 50 denotes a switching unit for setting and resetting the duplexed AVR-1 and AVR-2, and switching of the magnet SWs 45 and 46, and 51 is an AVR selector switch.

  4 is the same as the operation shown in FIG. 2, but the operation when switching to the slave side of the AVR-2 (B system unit) 42 will be described with reference to the flowchart shown in FIG.

  In FIG. 5, step S1 determines whether there is data input to AVR-2 via serial communication. If "Yes", the data input in step S2 is set in the table. Thereafter, in step S3, data is set from the table to the control loop. Here, the data to be set is the data for the set time before the table position set this time (when the set time is 3, the maximum is 20 for the data three times before the current input).

  After setting the data in the process of step S3, the process of converting the integral term of the first LPI to the field current is performed in step S4. After such processing, it is determined in step S5 whether or not switching has occurred, and if there is no occurrence, the processing ends.

  If it is determined “Yes” in step S5, it is determined whether the set time has elapsed in step S6. If “No”, the process ends. If “Yes”, the internal switch state is switched to the master side in step S7.

  FIG. 6 is a block diagram showing a second embodiment of the present invention. The same parts as those in FIG. In FIG. 6, AVR-1 is a master and AVR-2 is a slave. 61 is a master / slave determination processing unit, and 62 is a processing type determination processing unit that determines the type of processing during voltage establishment and processing during load shedding control.

  In FIG. 6, during the slave operation, the LPI calculation and D / A output calculations are stopped during normal control (other than voltage establishment control and load cutoff control), and only the data received from the master is stored. As a result, stable voltage control is possible even when the master side is switched.

  The processing type determination processing unit 62 performs processing for determining the voltage probability control time and load interruption control time described below.

  (A) Special processing is performed during voltage establishment control, and control is performed to match the D / A output and each LPI calculation integral term so that a current corresponding to I30 can be controlled during slave operation.

(B) As a special process during load shedding control, "0.0" is output during slave operation.
At the time of voltage establishment control At the time of voltage establishment control, if a master failure occurs, data cannot be received from the master, so each data value of the current master is unknown. For this reason, when becoming a master, there is a possibility that the voltage may be largely changed.

  However, in the second embodiment, at the time of this control, the current I30 is output. To obtain the output of I30, D / A output = set value. Other set values are as follows.

90R set value = 100%, second LPI calculation integration term = D / A output value calculated as a result, first LPI calculation integration term = 50%
The conditions for enabling / disabling this function are as follows.

Within # 41 (field breaker) ON time: This function is valid # 41 (field breaker) ON time or longer: Normal slave control load interrupt control During master interrupt when load interrupt control occurs, the master Since the data cannot be received, each data value of the current master is unknown. For this reason, when becoming a master, there is a possibility that the voltage may be largely changed. Note that, when the load is interrupted, the voltage increases for about 1 to 2 seconds, so the D / A output during this period is almost “0”.

  Therefore, the slave side has the following special processing.

  First LPI calculation integral term = 0.0%, 90R set value = 100%.

  The conditions for enabling this function are as follows.

# 52 (breaker) within the set time from OFF: This function is valid # 52 (breaker) from OFF to the set time or longer: Normal slave control FIG. 7 is a flowchart of the process type determination process. In FIG. If it is “Yes”, the process proceeds to step S12 to determine whether # 41 is “ON”.

  If "Yes" as a result of the determination in step S12, the process proceeds to step S13, and it is determined whether the set time has increased from # 41 to "ON". If the set time is up, “Yes”, the process of voltage establishment control flag 1 = 0 is performed in step S14, and the process proceeds to step S15.

  In step S15, it is determined whether or not # 52 is "OFF". If "Yes", the process proceeds to step S16, and it is determined whether or not # 52 is set time longer than "OFF". If the set time is up, the load cutoff control flag 2 is set to 0 in step S17 and the process is terminated.

  If the determination in step S13 is “No”, the process of voltage establishment control flag 1 = 1 is performed in step S18. If the determination in step S16 is “No”, the load cutoff control flag 2 = 1 is processed.

  When it is determined in step S11 that the operation is a slave operation, if “No”, the process proceeds to step S20 to determine whether the operation is to be switched to the master. If “Yes” as a result of the determination, the process proceeds to step S21. If flag 1 is “ON”, the voltage establishment process is performed in step S22, and the process is terminated.

  If “No” in the step S21, the process proceeds to a process in a step S23 to determine whether or not the flag 2 is ON. If “Yes”, the load blocking process is performed in a step S24 and the process is ended. If “No” in the step S 23, the process is switched to the normal switching process in a step S 25 and the process is ended.

1 is a schematic configuration diagram of a digital AVR device. 1 is a schematic configuration diagram showing a first embodiment of the present invention. Explanatory drawing of the field current detection value of both A and B system at the time of switching occurrence. The specific block block diagram at the time of duplexing an AVR apparatus. The flowchart at the time of a slave. The block block diagram which shows the 2nd Embodiment of this invention. The flowchart of a process classification determination process. The control block block diagram of the automatic voltage control apparatus of a turbine generator. (A) is a block diagram of a conventional analog AVR duplexing device, and (b) is an explanatory diagram when a failure occurs in the field current detection unit of the duplexing device. Explanatory drawing when transmitting the present calculation result etc. which are drive | operating on the master side to a slave side. The voltage transition condition explanatory drawing in case switching occurs at the time of voltage establishment. FIG. 6 is an explanatory diagram of a voltage transition situation when switching occurs when a load is interrupted.

Explanation of symbols

41 ... AVR-1 (A system unit)
41a ... CPU calculation unit 41b ... field current detection unit 41c ... IGBT control unit 42 ... AVR-2 (B system unit)
42a ... CPU calculation unit 42b ... field current detection unit 42c ... IGBT control unit 43,44 ... shunt 45,46 ... magnet SW
47 ... Generator excitation part 48, 49 ... DI signal input part

Claims (6)

A voltage control calculation unit that obtains a field current command by proportional integral calculation of a deviation between a detected voltage of the turbine generator and a set value of the voltage setting unit, and a deviation between the field current command and the detected field current value of the generator An automatic voltage control device comprising a field current control calculation unit for controlling the field current of the generator according to a proportional integration calculation,
The automatic voltage controller is configured as a master / slave duplexer. Data is exchanged between both automatic voltage controllers via serial communication, and a control loop is started with the data. Voltage control of the slave automatic voltage controller is performed. A dual processing device for an automatic voltage control device, wherein the proportional integral calculation term of the calculation unit is a field current value.   2. The dual processing apparatus for an automatic voltage control apparatus according to claim 1, wherein the setting of the extraction of data used in the automatic voltage control apparatus on the slave side can be changed. A voltage control calculation unit that obtains a field current command by proportional integral calculation of a deviation between a detected voltage of the turbine generator and a set value of the voltage setting unit, and a deviation between the field current command and the detected field current value of the generator An automatic voltage control device comprising a field current control calculation unit for controlling the field current of the generator according to a proportional integration calculation,
The automatic voltage controller is configured as a master / slave duplexer. Data is exchanged between both automatic voltage controllers via serial communication, and the control loop is started with that data. A dual processing apparatus for an automatic voltage control device, wherein the field current detection set time of the automatic voltage control device is a slave operation and the set time can be changed. A voltage control calculation unit that obtains a field current command by proportional integral calculation of a deviation between a detected voltage of the turbine generator and a set value of the voltage setting unit, and a deviation between the field current command and the detected field current value of the generator An automatic voltage control device comprising a field current control calculation unit for controlling the field current of the generator according to a proportional integration calculation,
The automatic voltage control device is configured as a master / slave duplexer, and a master / slave determination processing unit is provided to select and use both automatic voltage control devices. In this determination processing, either voltage establishment control or load cutoff control is processed. A duplex processing device for an automatic voltage control device, characterized in that a type determination processing unit is provided, and processing is executed in accordance with a result of the processing type determination.   5. The dual processing device for an automatic voltage control device according to claim 4, wherein when the processing type determination processing unit performs determination processing at the time of voltage establishment control, the output of the field current control calculation unit is set as a set value. .   5. The dual automatic voltage control device according to claim 4, wherein when the processing type determination processing unit performs determination processing at the time of load shedding control, the output of the field current control calculation unit is substantially “0”. Processing equipment

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