JPS6115599A - Digital excitation controller of generator - Google Patents

Abstract

PURPOSE:To readily obtain an optimum control characteristic even if the type and the state of a generator load are altered by composing blocks of a software, and selecting the block in response to a load state. CONSTITUTION:A microprocessor 20 contains programmed voltage/current setting block, deviation detection block and deviation amplifying block, and inputs detection outputs from an output current detector 13, a field voltage detector 4, a load current detector 14, a load DC voltage detector 15, a field current detector 13, and a field voltage detector 8. The block having optimum control characteristic and stability is selected in the generator load state on the basis of the load current value and the load DC voltage value, and a field power source 11 is controlled in response to the detection input on the basis of the selected block. Thus, even if the state and type of the generator load are altered, it can be readily optimally controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a digital excitation control device for a generator that is capable of selecting a feedback control system corresponding to the generator and the generator load state.

[Prior art]

Conventionally, there has been an excitation control device for a generator as shown in FIG. In the figure, l is an alternating current generator, 2 is a field winding of this alternator, and 3 is a generator load. 4 is a potential transformer PT, which detects the output voltage of the alternator. 5 is a voltage setting block, and 6 is a deviation detection block. The deviation detection block 6 detects the deviation between the detected value of the PTA and the voltage setting value of the voltage setting block 5. This deviation is amplified by the error amplifier block 7. 8 is a field voltage detector, and the detected field voltage value and the output of the error amplifier block 7 are guided to a deviation detection block 9, and the field voltage value and the error outputted by the deviation detection block 9 are detected. The deviation from the output of the amplification block 7 is input to the gate pulse generator 10 as a control signal. The gate pulse generator 10 supplies a gate pulse corresponding to the above deviation to the field power supply device 11 which is a silic type rectifier.

In this excitation control device, when a deviation occurs between the output voltage of the alternator 1 and the voltage setting value, the ignition phase of the thyrisk type rectifier 11 is controlled to bring the output voltage to the voltage setting value. The field currents are controlled so that they are equal.

Further, as shown in FIG. 2, this excitation control device is also used when controlling the voltage and current of the generator load 3 to a target value or a target pattern.

In any case, in this conventional excitation control device, the voltage setting block 5, the deviation detection blocks 6 and 9, and the error amplification block 7 are configured by hardware, so the control characteristics and stability can be improved. can be adjusted by changing the gain and time constant in this block, but there is a limit to the adjustment range, and when the load type or generator load condition changes, the optimal control characteristics and The problem was that it was difficult to obtain stability.

[Summary of the invention]

This invention was made in view of the above-mentioned conventional problems, and uses a microprocessor, stores the above-mentioned blocks in a programmed form, and selects an optimal one from among these blocks according to the load condition. A digital generator generator that has selection logic that selects several types of blocks that provide control characteristics and stability, making it easy to perform optimal control even when the type or condition of the generator load changes. This paper proposes an excitation control device.

[Embodiments of the invention]

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

In FIG. 3, the alternating current generator load 3 is a toroidal magnetic field coil for nuclear fusion, and DC power rectified by a diode rectifier 31 is supplied thereto. This rectifier 31 converts the AC output of the AC generator 1 into the DC power. 12
is a current detector that detects the output current of the alternating current generator, 13
14 is a DC current transformer DCCT for detecting the load DC current flowing through the toroidal magnetic field coil 3; 15 is a DC transformer DCPT for detecting the load DC voltage; 2o is a microprocessor. Input points 41.121. of this microprocessor 2o.
131.81.141.151 respectively PTA and C
T12, field current detector 13, field voltage detector 8, DC
The detection outputs of CT14 and DCPT15 are combined. 10
0 is an output point and is connected to the gate pulse generator 10. The microprocessor 2o stores a voltage/current setting block, one or more deviation detection blocks, and deviation amplification blocks in a programmed manner, and configures one type of feedback control system using the control block selection logic described later. A plurality of types of blocks are selected as shown in FIG. The control blocks in FIG. 4 include a current target pattern setting block (current setting block) 21 that generates the coil current target pattern shown in FIG. 6, a deviation detection block 22, an error amplification block 23, and a coil shown as B in FIG. Voltage target pattern setting block (voltage setting block) 24 that generates a voltage target pattern, addition block 2
5, error amplification block, 26, deviation detection block 27,
This is a control block of the feedback control system constituted by the error increase block 28, and FIG. 7 shows a flowchart of a program representing the control operation of the control system.

That is, this program converts the generator output voltage value detected by the PT4, the field voltage value detected by the field voltage detector 8, and the coil current value detected by the DCCT 12 into electric currents by A/D converting them. an input signal processing step, a step of calculating a coil current target pattern value, a step of calculating a current deviation between the coil current value and the coil current target pattern value, and A/D converting the signal of the coil voltage value detected by the DCPT 13. A step of processing the voltage input signal to be taken in, a step of calculating the voltage deviation between the above coil voltage value and the coil voltage target pattern value, a step of adding the above current deviation and the above voltage deviation, and a step of calculating the field detected by the field voltage detector 8. It consists of a signal processing step in which the magnetic voltage is A/D converted and taken in, and a step in which the above-mentioned deviation added value is corrected by the above-mentioned field voltage to calculate an output value, and this output value is sent to the gate pulse generator 10 as a control signal. is input.

In this way, the field current of the generator 1 is controlled, and the voltage and current supplied to the toroidal magnetic field coil 3 are controlled to patterns A and B shown in FIG.

The control system shown in FIG. 4 uses the control block selection block described above to select, for example, the fifth
The control system will be changed to the type shown in the figure.

FIG. 8 shows an example of the control block selection logic for selecting control blocks, including DCCT12, D
C: Calculate the resistance value Rc, inductance value Lc, and time constant τC of the toroidal magnetic field coil 3 from the coil current value 1c and coil voltage value Vc detected by PTL 3, respectively, and from these calculated values, the above 2 types classified in advance For example, generator load 3 of control systems 1 to 11 including two control systems.
Select a control system with optimal control characteristics and stability for the situation.

In this embodiment, since the error amplification block and the like are configured by software, the gain and time constant can be adjusted over a wide range.

〔Effect of the invention〕

As explained above, this invention has a configuration in which each block is configured with software, and a block with optimal control characteristics and stability for the load is selected depending on the type and condition of the generator and generator load. Even if the load type or state variables change, the generator field can always be controlled in the best possible condition.

[Brief explanation of the drawing]

1 and 2 are block diagrams of a conventional generator excitation control device, FIG. 3 is a block diagram showing an embodiment of the present invention, and FIGS. 4 and 5 are block diagrams of a microprocessor in the above embodiment. FIG. 6 is a diagram showing the coil current target pattern and coil voltage target pattern in the above embodiment, FIG. 7 is a flowchart of the program of the above control system, and FIG. is a diagram showing the control f17 block selection logic in the above embodiment. In the figure, 1-generator, 2-field winding, 3-load, 4
-P T, 8-field voltage detector, 10-gate pulse generator, 11-field power supply, 12-voltage detector, 13-=
- field current detector, 14 - DC current transformer, 15 - DC transformer, 2o - microprocessor, 21 - current target pattern setting block (current setting block), 22 - deviation detection block, 23 - error amplification block, 24-Coil voltage target pattern setting block (voltage setting block), 25
．． 27-deviation detection block, 26.28 error amplification block. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] It has an input point that takes in the detected voltage and current values of the generator and the generator load, and a detected value of the voltage and current of the generator field, and an output point that sends out a control signal, and has a voltage target value and a current target value. A setting block that calculates and sets a value, a deviation detection block that calculates the deviation between the set target value and the corresponding detected value, at least one error amplification block that calculates and amplifies the deviation, and corresponds to other detected values. a microprocessor that stores a programmed deviation detection block that detects a deviation from the deviation that is detected, and has a control block selection logic; and a field power supply device that controls the generator field current in response to the control signal; The control block selection logic determines the load condition from the detected voltage and current values of the generator load and selects a plurality of types of blocks constituting one feedback control system corresponding to the load condition among the blocks. Digital excitation control device for generators.