SU1515310A1 - Drilling rig electric drive - Google Patents

Abstract

This invention relates to electric drives with autonomous power sources. The purpose of the invention is to increase the efficiency and reliability of the electric drive. The electric drive of the drilling machine contains reversible and non-reversible thyristor converters connected to the output of the diesel-electric station, an electric motor is connected to the output of the first one, and a load is connected to the output of the other, while the control system of the reverse thyristor converter is made according to the principle of slave control with voltage regulators 8 and current 9. In order to achieve this goal, a recovery control unit 18, implemented on comparator 19 and logic elements 20-23 sec, is introduced into the electric drive. the right key 24 at the output, while the inputs of the block 18 are connected to the outputs of the intensity setting device 7 and the logic switching device 15, the executive circuit of the control key 24 is connected between the output of the current sensor of the electric motor 1 and the input of the control system 16 of the non-reversible thyristor converter 5, and the control the key circuit 24 is connected to the output of the OR-NOT 23 logic element. The invention eliminates the operation of a diesel engine in the compressor mode, which reduces the wear of its components and saves fuel. 2 Il.

Description

The invention relates to electrical engineering, namely to the field of electric drives with autonomous power sources, and can be used in drilling machines, construction, transport mechanisms, etc.

The purpose of the invention is to increase the efficiency and reliability of the electric drive.

Fig „1 shows a functional diagram of the electric drive; Fig. 2 shows timing diagrams explaining the operation of the electric drive.

The electric drive (Fig. I) contains an electric motor 1 connected to a reversive thyristor converter 2 with valve groups Forward 3 and Back 4 whose input, like the input of an irreversive thyristor converter 5, is connected to the output of diesel-electric station 6, serially connected setpoint 7 intensity, voltage regulator 8, current regulator 9 and pulse-phase system 10, control, the output of which is connected to valve groups 3 and 4 of the reverse thyristor converter 2 through control switches 11 and 12 Voltage and current sensors 13 and 14 connected to the inputs of the respective regulators, a logical switching device 15 connected by their inputs to the outputs of the current regulator 9 and the voltage sensor 13, and outputs connected to the control circuits of the controlled keys 11 and 12 as well as a control system 16 for non-reversible thyristor converter 5, a load 17 connected to its output and a block 18. recovery control, consisting of a unipolar comparator 19, a logical element NOT 20, a logical element AND-NOT 21 and 22, a logical element OR-NOT 23 and a third control key 24, while the input of the unipolar comparator 19 is connected to the output of the setting unit 7 intensity, and

0

key 24 connected between the output of the current sensor 14 and the input of the control system 16 of the irreversible thyristor converter 5.

A diesel generator 6 is a system consisting of a diesel and a three-phase voltage generator coupled to it.

Logical switching device 15 is designed to connect valve groups 3 and 4, depending on the ratio of the signals at the outputs of the regulator 9 and the voltage sensor 13.

FIG. 2 introduced the following notation:

n is the speed of the electric motor 1;

1 is the current of the main winding of the electric motor 1;

I Yj - output signal setpoint 7 intensity;

Y - output signal odnopolno0

five

the comparator 19;

Yjo output signal element 5 NOT 20;

 &Apos; is the output signal of the logic switching device 15 controlling the key 11;

Y,, - output signal is logical 5-12

TH switch device 15 that controls the key 12;

21 U-ge output signals of the logical elements AND-NOT 21 and 22, respectively;

 the output signal of the element OR NOT 23 ;.

W., - output signal of the sensor 14

current;

 the output signal of the recovery control unit 18 (input signal for the control system 16);

t, t 2 time point of the transition of the electric motor 1 in the generator mode;

t, t4 is the time of acceleration of the electric motor 1 in the motor mode „

The unipolar comparator 19 is implemented on an operational amplifier, and

output - directly to the first input-50 arriving at its input to the position of the logical element AND-NOT 21 and through the logical element NOT 20 to the first input of the logical element AND-NOT 22, the second inputs of which are connected separately to the outputs of the logic switching device 15, and the outputs are connected to the inputs of an OR-NOT 23 logic element connected by its output with the control input of control 5

A positive signal equal in amplitude equal to the level of the log appears at its output. 1. With a negative signal at the input of the comparator 19, a log occurs at its output. ABOUT.

The element HE 20 has a log output signal. Oh, when at his entrance -.

51

signal log. I, and the signal log. 1 on the input, if the input - a log. ABOUT.

Element AND-IE (21 and 22) has a signal output log. 1, only if the level signal is equal to the log in both its inputs. Oh, with any other combination of input signals at the output - the log. ABOUT.

The OR-NOT 23 element has the output of the signal log „1 only in the case when the signals of the log are simultaneously present at its inputs. Oh, with all the other combinations of input signals at its output - the log. ABOUT.

The principle of the device is as follows

The intensity setting device 7 forms a linearly increasing (falling, fig. 2d, n) voltage, which determines the acceleration (deceleration) rate of the electric motor I.

The voltage regulator 8, together with the voltage sensor 13, forms a voltage stabilizing circuit on the core of the electric motor 1, which generates a signal proportional to the speed of the electric motor. The output of the regulator 8 1 prj is input CHFHajTOM for the regulator T current,

The contour is connected to the current realized by the current controller 9 and the sensor 14 Current,

The lO system of pulse-phase control implements the formation and mixing of the control: their pulses are proportional to the output signal with a 1-eye controller 9, which leads to a change in vent voltage of the valve ground; 3 or 4,

A logical switching device 15 compares the output CHriia.noB of current regulator 9 and voltage sensor 13 and, depending on the polarity of their difference signal, connects either gate group 3 (via key 11) or valve group to system 10 of pulse-phase control. 4 (via key 12), i.e. at the outputs of the logic switching device 15, key control signals 11 and 12 cannot exist simultaneously.

 Consider the case when the drive operates in the steady state, i.e. At the output of the intensity setting device 7, a positive voltage is present (Fig. 2).

ten"

At the output of the voltage regulator B, a signal is generated that comes to} the output of the current regulator 9, the output of which also contains a signal. The pulsed-phase control system 10 forms and shifts the steering angles in proportion to this signal. Since the output of the converter 2 is voltage, the voltage sensor 13 generates a signal that is supplied simultaneously to the voltage regulator 8 (due to which the stabilization circuit provides a constant distance to the converter 2 output) and to the logic switching device 15, Since the drive is in the static state, the signal of the current regulator 9

the amplitude is greater than the voltage sensor signal 13, i.e. their difference is positive, as a result of which, at the output of the logical switching device 5 controlling the key 11, the signal

log 1, and the output controlling the key 12 is a log. Oh i key II is closed, and key 12 is open.

At time t, the signal at the output of the dial 7 starts linearly

to subside The signals at the outputs of the regulators 8 and 9 also decrease. , the difference signal and the output of the logical switching device changes the sign, as a result of which a signal log appears on its output, which controls the key P. Oh, and the output that controls the key 12 is a log. 1. Switching of keys 11 and 12 takes place, the electric motor switches to the generator operating mode (II quadrant), i.e. recuperator M1vnoe braking of the electric drive occurs,

At time t, the signal at the output of the setting device 7 becomes equal to zero, the electric motor stops. If the signal at the output of the setpoint generator 7 continues to vary linearly (the negative voltage builds up across the amplifier), the electric motor 1 accelerates to a speed corresponding to the signal level at the output of the control unit 7, the voltage at the output of the control unit 7 has a negative sign, and at the output of the device 15,

control key 12, there is a signal log. 1 (key 12 is closed), the output controlling the key 11 is a log, o (key and open).

At time tj, the signal at the output of the sensor 7 starts to decrease linearly (Fig. 2b, p) and the electric motor switches to generator mode (IV quad- .rant). The algorithm of the electric drive is similar to that described, i.e. switches 12 and 11 are switched, and the drive performs regenerative braking.

It is obvious that in the I quadrant the signal at the output of sensor 7 of intensity is positive, and the key 11 is closed.

In the transition of the electric motor 1 in the generator mode (II quadrant) with a positive signal at the output of the setting device 7, the key 11 is open, and the key 12 is closed.

In the third quadrant, the signal at the output of the setting device 7 has a negative sign and the key 12 is closed.

During the transition of the electric motor 1 to the generator operating mode (IV quadrant) with a negative signal at the output, setpoint 7, key 12 is open, and key 11 is closed, i.e., the drive algorithm allows the following one-to-one correspondences to be established,. Motor mode of operation:

1) UT is positive and key 11 is closed;

2) Y is negative and key 12 is closed.,

Generator mode:

1) Yj is positive and key 12 is closed;

2) Y-, - negative and the key 1 1 is closed.

Based on these correspondences, a recovery control unit 18 is constructed.

Block 18 works as follows.

At time t, the electric drive goes into regenerative braking mode, while the output of the comparator 19 is a voltage log. 1 (Fig. 2, d), and the output of block 20 is a log. O (Fig. 2, e).

At this point in time, at the outputs of the device 15, the following states: Y, Y., - log. Oh, U, 5., g log. 1, i.e. at the moment of time, the inputs of the AND-NOT element 21 combinations of input signals from the log. 1, and the inputs 1 of the second element NONE 22 - two log. ABOUT.

Thus, while the moment t is the first element AND-NOT 21 changes its state with the log. 1 on the log. Oh, and the second element AND-NOT 22 retains its previous state log. O (Fig. 2i, i.e., i.e., at the inputs of element 23, a combination of two log signals of input O appears, resulting in a -1 output of element 23 and a signal of log 1 appears, causing the switch 2A and a control signal is received from the current sensor 1A to the control system 16 (Fig. 1), which turns off the thyristor converter 5. The key 2A will be closed until the signal at the output of the setpoint 7 decreases to the level of the unipolar comparator 19 then after the output of the element 21 (the moment of time t, Fig.2, g, d, e, and) the signal log appears, 1 which changes the output state of element 23 (Fig. 26, l) from log to log.

The key 24 is opened, the thyristor converter 5 is closed.

Thus, the time period .i when the electric drive of the drilling machine operates in regenerative braking mode J, which is accompanied by energy recovery to the diesel electric unit 1 (Fig. 1), is characterized by the open state of the inverting converter 5, which on the load 17 dissipates energy recovered by thyristor converter 2,

In case the drive operates with a negative voltage at the output of the setting device 7 (Fig. 2b, c), the operation algorithm of the recovery control unit 18 is similar to that described. FIG. 2, p, p, s, t, y, f, x, c, h, w are given temporary diagrams of the operation of the unit's elements for this case.

The introduction of a recovery control unit eliminates the operation of a diesel engine in the compressor mode, during which an in- tensive wear of the diesel engine occurs, resulting in an increase in reliability of the drilling machine P by the floor .;

Since the invention of artificial diesel engine operation in the compressor mode, it is switched to regenerative braking of the electric drive at idle mode.

stroke, diesel fuel is significantly saved,

In addition, as an additional load 17, auxiliary process equipment of the machine (lighting, water heating, etc.) can be used, as a result of which the efficiency of the whole equipment complex, i.e. its economy

Claims (1)

Invention Formula The electric drive of the drilling machine containing an electric motor connected to a reversible thyristor converter, the input of which is connected, like the input of a non-reversible thyristor converter, to the output of a diesel-electric station, consequently connected to an intensity generator, a voltage regulator, a current regulator and a pulse-phase control system, the output of which through controlled keys is connected to the valve groups of the reverse thyristor converter connected to the inputs of the corresponding controllers ditch voltage and current sensors, a logical switching device, connected by its inputs to the outputs of the current controller and sensor 5 0 0 five voltage and outputs connected with the control circuits of the mentioned control keys, as well as a control system of an irreversible thyristor converter and a load connected to its output, characterized in that, in order to improve the efficiency and reliability of the electric drive, a block is inserted into it recovery control, consisting of a unipolar comparator, a NOT logical unit, two NAND logical elements, an OR-NOT logical element, and a third controlled key, while the input of the unipolar comparator is connected to the output at the intensity indicator, and the output is directly to the first input of the first NAND logic element and through the NEV logic gate to the first input of the second NAND logic element, the second inputs of which are connected separately to the outputs of the logic switching device, and the outputs are connected to the inputs of an OR-NOT logical element connected by its output to the control input of a control key connected between the output of the current sensor and the input of the control system of the non-reversible thyristor converter.