JPS61185100A - Digital excitation controller of generator - Google Patents

Abstract

PURPOSE:To control the field of a generator always in the best state by selecting the block having the optimum control characteristic and stability in response to a request of an object to be controlled. CONSTITUTION:A microprocessor 20 contains various control blocks such as a coil current target pattern set block 21, a deviation detecting block 22, a deviation amplifying block 23, a coil voltage target pattern set block 24, deviation detection blocks 25, 27, deviation amplifying block 26, 28 as programmed. The states of objects to be controlled are always monitored to select the block having the optimum control characteristics and stability. Thus, the field of a generator can be controlled always in the best state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital excitation control device for a generator that controls the voltage and current of a generator and a generator load in a fixed pattern.

[Conventional technology]

The conventional excitation control device for a generator is the one shown in Figure 6. In the figure, 1 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, which detects the deviation between the detected value of the voltage transformer FT4 and the voltage setting value of the voltage setting block 5. This deviation is amplified by the deviation amplification block 7.

8 is a field voltage detector, and the detected field voltage value and the output of the deviation amplifier block 7 are led to a deviation detection block 9. The deviation between the field voltage value output by the deviation detection block 9 and the output of the deviation amplification block 7 is input to the gate pulse generator 10 as a control signal. The gate pulse generator 10 corresponds to the above-mentioned deviation and has a field power supply bag which is a thyristor type rectifier.
supply to.

In the excitation control device having the above configuration, when a deviation occurs between the output voltage of the alternator 1 and the voltage setting value, the firing phase of the thyristor type rectifier 110 is controlled.
The field current is controlled so that the output voltage is equal to the voltage setting value.

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

[Problem that the invention seeks to solve]

In any case, in the above-mentioned conventional excitation control device, each control block such as the voltage setting block 5 to the deviation detection block 9 that constitutes this device is composed of hardware, so the control state may change during control. However, even if the control requirements for the controlled object change, the control must be performed using a single control block, making it difficult to obtain optimal control performance.

This invention was made to solve these problems, and it is an object to obtain a digital excitation control device that can control the field of the generator in the best possible condition! purpose.

[Means for solving problems]

The digital excitation control device for a generator according to the present invention includes:
Using a microprocessor, you can set detection conditions such as changes in control status and control requests in the program, and have the microprocessor detect them so that each woodcutter control block can be selected at will during control. It's a good friend.

[Effect]

Since the microprocessor in this invention detects the detection conditions and selectively controls various control blocks, it is possible to always control the field of the generator in the best condition.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1, in which the same parts as in FIG. 6.7 are given the same reference numerals. In FIG. 1, an alternating current generator load 3 is a toroidal magnetic field coil for nuclear fusion, and is supplied with DC power rectified by a diode rectifier 31. This rectifier 31 is connected to the alternator 1
The AC output of is converted into the above DC power.

12 is a current detector that detects the output current of the alternator 1;
13 is a current detector CT for detecting the field current, 14 is a DC CT for detecting the load DC current flowing through the toroidal magnetic field coil 3, and 15 is a DC transformer for detecting the load DC voltage. (DCPT).

20 is a microprocessor. Input point 41.121.131.81.141 of this microprocessor 20
．． 151, DCPT4, DCCT12, field current detector 13, field voltage detector 8, DCCT14, D
The detection outputs of CPT 15 are combined. 100 is the output point of the microprocessor 20, and the gate pulse generator 1
Connected to 0.

The microprocessor 20 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 control block selection logic to be described later. A plurality of types of blocks are selected as shown in FIG.

The control blocks in FIG. 2 include a current target pattern setting block (current setting block) 21 that generates the coil current target pattern Ai shown in FIG. 4, a deviation detection block 22, a deviation amplification block 23, and a coil voltage target pattern shown in FIG. This is a control block of a feedback control system composed of a voltage target pattern setting block (voltage setting block) 24 that generates B, an addition block 25, a deviation amplification block 26, a deviation detection block 27, and a deviation amplification block 28. FIG. 5 shows a flowchart of a program showing the control operation of the control system.

That is, this program causes the DCPT 4 to A/D convert the generator output voltage value detected by the field voltage detector 8, the field voltage value detected by the field voltage detector 8, and the coil current value detected by the DCCT 12. A step of processing the current input signal to be taken in, a step of calculating a coil current target pattern value, a step of calculating the current deviation between the above 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 voltage input signal processing step for converting and importing, a step for calculating the voltage deviation between the coil voltage value and the coil voltage target pattern value, a step for adding the above current deviation and the above voltage deviation, and detection by the field voltage detector 8. It consists of a signal processing step in which the field voltage is input by 4A/D conversion, and a step in which the added deviation value is corrected by the field voltage to calculate an output value, and this output value is used as a control signal for the gate pulse. is input to the generator 10.

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. 4.

In this embodiment, since the deviation amplification block etc. are configured by software, control requests are always made even during control! Judging from each control block, each can be easily changed. For example, when starting the current and voltage at the start of control, it is possible to change to the block shown in FIG. 2, which has good follow-up, and when controlling a constant value, it can be changed to the block shown in FIG. 3, which has good stability and accuracy.

〔Effect of the invention〕

As described above, according to the present invention, various control blocks of the control system are configured by software, and a block with optimal control characteristics and stability is selected according to the requirements of the controlled object even during control. Even if there are changes in the generator load or state variables, the generator field can always be controlled in the best condition.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIGS. 2 and 3 are diagrams showing examples of blocks constituting the control system in the microprocessor in the above embodiment, and FIG. 4 is a block diagram showing the above embodiment. FIG. 5 is a flowchart of a program for the control system, and FIGS. 6 and 7 are block diagrams of a conventional excitation control device for a generator. 1 is a generator, 11 is a field power supply device, 20 is a microprocessor, 21 is a current target pattern setting block (current setting block), 22, 25.27 is a deviation detection block,
23, 26, and 28 are deviation amplification blocks, and 24 is a coil voltage target pattern setting block (voltage setting block). In addition, in the figures, the same reference numerals indicate corresponding parts.

Claims (1)

[Claims] It has an input point that takes in the detected values of the voltage and current of the generator or the generator load and the detected values of the voltage and current of the generator field, respectively, and an output point that sends out the control signal, and has a target voltage value and a current value. A setting block that calculates and sets a target value, a deviation detection block that calculates a deviation between the set target value and a corresponding detected value, and at least one block that calculates and amplifies this deviation.
The above deviation amplification block, a microprocessor containing a programmed deviation detection block that detects the deviation between other detected values and the corresponding deviation, and controls the generator field current in response to the above control signal. A digital excitation control device for a generator having a field power supply device, characterized in that the various blocks mentioned above can be arbitrarily selected according to the control state and the control request of the controlled object even during control. Digital excitation control device for generator.