JPH02280700A - digital excitation device - Google Patents

Abstract

PURPOSE:To decrease the man-hour for adjustment by automatically converting a level into an arithmetic rated value only by inputting the values of the rated voltage and current. CONSTITUTION:Output voltage and current of a generator motor 1 are converted from a high voltage level to a low voltage level through a transformer 2 and a converter 7. Further a signal of low voltage level is fetched to a controller 5 and converted into a value in proportion to the voltage and current. This value, being different in accordance with specification of the motor generator 1, is converted into a relative value in the inside of the controller 5. This conversion is performed by a system such that fine adjustment is performed only by the controller 5, further when the rated voltage and current are input, a specified value can be obtained automatically in the controller 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an excitation device for a generator motor, and particularly relates to a static excitation device using a digital controller. As described in No. 49-113115, the output voltage and current of the single-stroke motor are converted to a transformer (PT).
The current transformer (CT) has been used to insulate it from the high-voltage circuit, and the level has been converted to a low-voltage level, and then the level has been finely adjusted using a variable resistor or the like.

[Problem to be solved by the invention]

The above conventional technology has the following problems in terms of standardization.

(1) Transformer (PT) on the generator motor output side, current transformer (
CT) specifications, it is necessary to switch the taps of the transformer on the level converter side, and it is necessary to prepare a transformer with a different tap each time.

(2) Whenever the output specifications of the generator motor are changed, it is necessary to readjust the level conversion each time.

(3) Because the specifications require design changes and re-inspections each time, it is difficult to manufacture as a mass-produced product and reduce the price.

(4) After adjustment using simulated input and after starting up the generator, it is necessary to readjust the level by operating the actual machine.

These adjustments require a large amount of time and effort.

An object of the present invention is to solve the above problems and provide a standardized, inexpensive, and highly reliable excitation device that can be mass-produced.

[Problem to be solved by the invention]

The excitation device includes generator voltage detection and field current detection.

It had various functions such as a cross current compensation function, an overexcitation limit function, and a low excitation limit function, and each function had a voltage and current level setting device for each function. For this reason, a simulated power supply is prepared according to the rated output voltage, current, and field current of the synchronous generator motor (hereinafter referred to as the main machine), and a simulated power supply is prepared for each function. For the detector, parts were prepared with specifications rated to match the main engine rating, and then adjustments were made to each part.

Preparing and adjusting parts for these adjustment parts requires a great deal of cost and time.

[Means to solve the problem]

For example, in generator voltage detection, the secondary voltage of PT is 110
110v transformer if Vt', 1 if 115V
The voltage was received by a 15V transformer, then rectified, finely adjusted to a voltage level of 10V, etc., and input into the calculation section.

The present invention focuses on the fact that as long as the value at the final calculation section is a specified value, it does not matter what the signal level is at any intermediate stage, and eliminates all intermediate stage variable adjustment sections. , a method is adopted in which fine adjustment is made only in the final calculation section, and furthermore, an automatic fine adjustment device is provided that can automatically set the specified value to the final calculation section by inputting the rated voltage and current.

[Effect]

The output voltage and current of the generator motor are converted from a high voltage level to a low voltage level through PT and CT.

Furthermore, low voltage level signals are taken into the controller and converted into numerical values proportional to voltage and current.

Since this value varies depending on the specifications of the generator motor, it is converted into a relative value inside the controller. That is, regardless of the capacity of the generator motor, the 100% rated voltage/current value is set to a fixed value of, for example, 10o.

In this conversion, the conversion constant of the analog input section is fixed, for example, 1v10 digits, so the final adjustment value (
For example, to set it to 100), the analog input signal level must be set to IOV with a slight Fl! I need to adjust it. This means that if the external input specifications change, it will be necessary to make fine adjustments each time. Instead, compare the numerical value of the analog input signal (for example, 50) with no adjustment at the rated input and the final calculated value (for example, 100),
By incorporating a coefficient multiplier within the controller that automatically determines the conversion coefficients, it is possible to achieve a device that is not influenced by external input specifications.

〔Example〕

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

The output voltage of the generator motor 1 is stepped down to a 110v level via a transformer (hereinafter abbreviated as FPT) 2.

In order to further convert it to a lower pressure level, through transformer 3,
After being converted into a DC voltage by a rectifier 4, it is converted into a digital quantity by an analog human power (hereinafter abbreviated as AI) 6 of a controller 5.

Assume that the A power output is 50 at the generator motor rated output voltage. In the controller 5, the final calculated value (for example, 10
o), use 1g in the coefficient multiplier and determine the constant of K18 by the procedure shown in FIG.

Similarly, the field current of the generator motor 1 is set to a 5A level via a current transformer (hereinafter abbreviated as CT) 7, and then converted to a DC voltage by a rectifier 4, and then converted into a digital quantity by an AI 6 of a controller 5. Convert.

AI high output of field current at generator motor rated output.

Assume 10. Assuming that the final calculated value in the controller 5 is 100 as above, the coefficient 29 at this time is the second
10 is automatically determined by the same method as shown in the figure.

〔Effect of the invention〕

According to the present invention, PT corresponding to the rated output of the generator motor
By simply applying the secondary voltage and current of the CT, the adjustment of the signal capture level is completed and the final calculated value is automatically calculated.

(1) No matter how the specifications of the generator motor change, 1
For example, if you want to change the capacity from 10100O to 10MW, you have to change the tap of the transformer as usual.
It eliminates the need for hardware changes such as readjusting variable resistors, reducing testing man-hours.

(2) Manufacturing a standardized, mass-produced type of excitation device that does not require changes in hardware specifications even when used in other generator motors can be made at low cost.

There is an effect.

[Brief explanation of drawings]

Fig. 1 is a functional explanatory block diagram of an embodiment of the present invention;
The figure is a flowchart of the setting procedure of 1g in the coefficient unit of FIG.

Claims (1)

[Claims] 1. The level can be automatically converted to the calculated rated value by simply inputting the rated voltage and current in the exciter calculation control section of the generator motor, which consists of a voltage/current level converter and an amplifier. A digital excitation device characterized by: