SU1443076A1 - Regulator of thyristor reactive power compensator - Google Patents

Abstract

The invention relates to electrical engineering and is intended for use in the automatic control system of a thyristor compensator of reactive power of powerful asymmetrical, rapidly changing loads of industrial enterprises. The purpose of the invention is to increase reliability. The goal is achieved by simplifying. functional converter 6, which controls the operation of the three-phase reactor depending on the measured and calculated value of the controlled parameter - reactive power. The functional converter contains a phase control device 23, a cumulative driver unit 27, an analog-pulse converter 25, a zero-organ 22, a logic device 20. An adder of the adjustable parameter 5 is connected to the input of the analog-pulse converter, the output of the phase control device is connected to the unit thyristor control. Logic device can be implemented by means of analog, digital technology or a combination of them. The regulator implements the well-known Steinmetz algorithm, transforming it into a thyristor control angle depending on the voltage frequency of the three-phase supply network. 3 il.

Description

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ABOUT)

The invention relates to electrical engineering and is intended for use in an automatic control system (ATS) of a thyristor complex 1443076 2

TTRISTOR 12. OP b (Fig. 2) contains a logical device (LU) 20, which is made with at least four input channels and one active power receptacle (TCRP) of powerful asymmetrical, fast changing industrial loads.

The aim of the invention is to increase reliability.

FIG. 1 shows the functional diagram of the TCRP regulator; in figure 2 10

horny The input 21 of the LU 20 is connected to the output of the null organ 22, as well as to the synchronizing input of the phase control device (UFD) 23. The input 24 of the LU 20 is connected to the same - to the input of the LU to control the thyristor 15, as well as to the output of the analog-pulse converter (IP) 25, the input of which is connected to the output of the adder 5.

horny The input 21 of the LU 20 is connected to the output of the null organ 22, as well as to the synchronizing input of the phase control device (UFD) 23. The input 24 of the LU 20 is connected to the same - to the input of the LU to control the thyristor 15, as well as to the output of the analog-pulse converter (IP) 25, the input of which is connected to the output of the adder 5.

functional structure diagram

a TKRM controller converter (one Input 26 of the LU 20 is connected to the input of six channels); in fig. 3 in addition to the driver unit 27, on

one of the outputs of which is powered by the PI 18 and the other is connected to the output 28 of the LU 20 and also to the second controlled input of the FPS 23. Input 29 of the LU 20 is connected to the output 28 of the LU 20 and also to the second controlled input of the FPS 23. Input 29 The LU 20 is connected to a high-pulse version of the functional converter of the TCRP regulator (one of six channels).

The TCRP regulator contains three instantaneous current sensors (DT), which are connected to the corresponding inputs

20

horny The input 21 of the LU 20 is connected to the output of the null organ 22, as well as to the synchronizing input of the phase control device (UFD) 23. The input 24 of the LU 20 is connected to the same - to the input of the LU to control the thyristor 15, as well as to the output of the analog-pulse converter (IP) 25, the input of which is connected to the output of the adder 5.

Ufa 23, and also through the unit of multiplication units 2 multiplying, Three sensors 3 instantaneous voltage supply network 25 directors (not shown) with a thyristor (DN), which are also connected to a- 12. The input of the zero-organ 22 is fed to the corresponding inputs blocks 2. The output of the phase synchronization voltage of each of the three blocks 2 is connected via (for example, ep5, common-to-thyristor cut inverters 4 to the input of the adder .5 12), the control flow diagrams of its phase control channel and from the remaining thyristors j, i. 13, 14 ,. The inputs of the adders of the 5 phases of the neighboring ka- 16 and 17 are absolutely similar. cash management. The output of each of the three adders 5 is connected to the input of the functional Converter (OP)

6 regulators of each phase in a separate zero-body 22 are used, respectively. The input of each FP 6 is also respectively connected to the output of the corresponding sensor 3, for example. The principal circuit (Fig. 3) is complete according to the block diagram (Fig. 2) of the FP 6 of the TCRP regulator. In which the parator 30, on the inverted input of which the synchronous voltage is applied, for example, Id g,. Its output 21 is connected to the synchronous input QF UF 23, which contains a latitude on-sh-modulator (Ш1Ш) 31, a coincidence circuit 32 and keys 32.2 and 32.3, and the logic block contains keys 33-38 ,, 1, 38.2. UFU 23 output power supply circuit. Parallel to the load input 7, a filter-compensating device (PKU) 8 and a three-phase reactor 9-11, controlled by thyristors 12-17, are connected through a control unit (not shown) from the corresponding

pins 12-17 (according to the numbers of the trhristors) cut out the output of the circuit 32 coinciding with the SF 1 6, receiving power from the power source (PI) 18, as well as through the master device (memory) 19 (the resistor connected according to the adjustable divider circuit). Three FP 6 TCRP regulators are used one per phase (Fig. 2). In turn, the FP 6 consists of two symmetric parts of the channel. In control of the number of thyristors 12-17.,

50

It is connected to the output 29 of the LU 20, to which the input of the key 38.1 is connected, as well. Also through the control unit (not showing the thyristor 12. The output 39 of the SchSch 31 is connected to the second input of pattern 32.1 of the match. The output of the accumulator unit 27 (in the simplest case, the storage capacitor 40) is connected to the input 25 of the LU 20, as well as through the

those. six channels. All of them are similar to 41 preliminary prelaunchs and therefore structural accumulation of the charge of the capacitor 40 is given.

an FP circuit 6 for controlling the thyristors 12 and 15, wherein the control channel structure is shown in detail,

Ufa 23, and also through the control unit (not shown) with thyristor 12. Synchronous phase voltage (for ep5, common to thyristor 12) is applied to the input of the null organ 22, i.e. 13, 14 ,. 16 and 17 are absolutely similar.

The control unit (not shown) with thyristor 12. Synchronizing phase voltage (for example, ep5, common-mode thyristor 12) is applied to the input of the zero-body 22, i.e. 13, 14 ,. 16 and 17 are absolutely similar.

The schematic diagram (FIG. 3) is complete according to the block diagram (FIG. 2) of the OP 6 of the TCRP regulator. 22 was used as a null organ.

the comparator 30, on the inverted input of which the synchronization voltage is applied, for example, Id g,. Its output 21 is connected to the synchronous input QF UF 23, which contains a latitude on-sh-modulator (Ш1Ш) 31, a coincidence circuit 32 and keys 32.2 and 32.3, and the logic block contains keys 33-38 ,, 1, 38.2. Output UFU 23 through the output of circuit 32 matches sub 50

It is connected to the output 29 of the LU 20, to which the input of the key 38.1 is connected, as well. Also through the control unit (not shown) thyristor 12. Output 39 of the Shch 31 is connected to the second input of pattern 32.1. The output of the cumulative-setting unit 27 (in the simplest case, the storage capacitor 40) is connected to the input 25 of the LU 20, as well as via a key 38.1 to the output of the setting device 19 (in the simplest case, the resistor is switched on according to the regulation3

dividing divider) and further to Ш 18, from which also necessarily recorded 1SHIM 31.

Regulator TCRP works as follows.

Preliminary from PI 18 through memory 19, the installation of which corresponds to the required power factor at a specific load 7, and the button 41 for pre-accumulation of charge energizes the storage and reference unit. Then power is supplied to all other elements of the TCRP regulator. After that, the information of the controlled parameter (reactive power) is obtained further continuously from DT 1, the supply network of the block 2 multiplication. Inverters 4 and adders 5, which implement the well-known Steinmetz algorithm, in the form of reactive power (± Q / (B tQ C ± RSL) are fed to the input of the FP 6. Parallel to the input of the zero-organ 22 (OVZO), the synchronizing voltage from the DND a given thyristor switch, for example, 12, which controls the operation of the reactor during a half-period of the supply voltage.

Let us consider in detail the operation of one channel of the FP 6, for example, to control the thyristor 12 and the common-mode voltage for it. On the inverse input of the zero-body 22 (comparator 30) enters + Uj-. For example, entered sig-B

cash with a sign - and it is present at the input of the comparator 30 during the half period -. In this case, the signal at the output of the comparator 30 during the half-period opens keys 33 and 34. If the signal from the output of the AIP 25 is positive (+ Qflg), then the key 37 is opened and the capacitors 40 through the keys 33 and 37 are discharged with some time constant. If the monitored parameter is in the same half-period, then the key 37 is closed, the key 36 is opened and after 38.2 some charge arrives at PI 18 in block 27 (capacitance 40.) Then, after half a period, the CDR changes at the input to +, then the comparator 30 output signal corresponds to a logical zero. When this ktshchi 33, 34, 36, 37 and 38.2 closed and opens the key 35, the PWM 31 starts at the inverse input, and the potential input through the key 35 is connected to block 27. The duration of the output name1

have a voltage sign with -

ten

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PWM pulse 35 (and it is positive) is proportional to the voltage of the modulating signal, i.e. the voltage of the cumulative-setting unit 27. Rear

 the pulse front of PWM 35 (logical zero) triggers element 32.1, and the output positive pulse of element 32.1 (output pulse UFU 23) is fed to the control electrode of the thyristor switch 12, generally through an amplifier electrically isolated, for example, through an optoelectronic switch . At the same time, the output signal from

g UFU 23 at the same time to continue the operation of this shoulder of the FP 6 in automatic mode comes to the key 32.2 and 32.3. This logical link is necessary in order for block 27 to receive a reset signal (if block 27 has a capacity of 40, it is discharged, and if a digital register, then the entry in it is erased). After cleaning (reset) unit 27 it

25 through the key 38.1 again writes information in accordance with the equation

20

thirty

35

LAB-Ifl6 М С-and where Lдр, 1др - .. respectively, the inductance and current of the phase AB; and - power supply voltage during simulation; MS - modeled capacity C in scale M.

Next, the generated control signal must be applied to the corresponding thyristor key (for example, 12). This happens as follows. When the synchronizing voltage passes through zero to the positive region (for example, for thyristor 12), a negative signal is generated at the output of the null organ 22. This signal closes the keys 33 and 34 and opens the key 35. A negative negative signal is fed to the synchronization input of the UFU 23 (PWM 31), one of the inputs of the circuit 2 NON-AND 32.1 matches the negative front. Through the switch 35, the generated voltage in block 27 (capacitor 40) is fed to the modulating input 28 of the SFD 23 (I; MM 31). At the same time, the duration of the PWM 31 output signal (its output pulse is positive) is directly proportional to the voltage of the modulating signal, i.e. the voltage of block 27 (capacitor 40). Output sig40

50

55

PWM is 31 at output 39, but it is positive, and the output single signal of the 32.1 circuit matches only when the output of the PIM is

31 zero. Thus, the length of the output signal of the ShSh 31 is proportional to the voltage in block 27 (capacitor 40), formed as a function of the continuous adjustable parameter + Q.g for 180 e. hail, for the previous half-period of the mains supply voltage for a given TRG arm that controls the operation of the reactor (for example, 9) through a triac key (thyristor 12). As a result of the identified process of operation of the FP 6 of the TCRP controller (using the example of the thyristors control channels 12, 15), the automatic control process is implemented as a controllable parameter; {; Qrtg, reactive power

according to the formula MTJ -, - or something

“Db

same, according to the formula Qn - Work

BEFORE

the remaining channels FP 6. of the regulator of the automatic control system (ATS) of the TCRM is absolutely analogous.

Thus, the proposed device allows to realize the SAR of the TCRP regulator as a function of continuous balancing reactive power at the input of the load node depending on the continuously received signal of the controlled parameter in the form of measured and calculated reactive power and converted into the control angle thyristor TRG keys according to the well-known SFCM control algorithm.

In addition to the described operation of one cycle, equal to the period of the supply voltage, it is necessary to add that the signal from the output of the circuit 32.1 Coincidence goes simultaneously to the thyristor 12 through the control unit and to the input of the key 38.1, which automatically prepares the accumulator-driver unit 27 ( The capacitor 40) is charged through the driver 19 from the PI 18 o. Thus, the operation of each channel of the AF 6 is prepared during the next period. The alternation of operation of the thyristor control channels 12-17 occurs automatically as a function of the controlled parameter depending on the frequency of the three-phase supply voltage.

The implementation of the proposed device eliminates in particular the need to use special

phase shifting devices, to simplify the system of automatic regulation of the regulator TKRM. make it much more robust, simple and reliable in operation 6 (j3 dynamic indicators and. in addition, the device can be easily implemented as analog, digital elements or a combination of them.

Formula and 3 about b p

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The regulator of the thyristor compensator of reactive power, containing a battery of capacitors and a three-phase group of reactors with THpHCTOpHFjiMH regulators, load current sensors, power supply voltage sensors connected via terminals for connecting to the mains supply parallel to the load of 1 metric load. variable-parameter gators and functions. Phase-controlled transducers of phase control, including zero-org, and logo-impulse transducers, to the thyristor control unit, the source no, about tl and h and y u and i "

so that, in order to increase reliability, the functional converter is equipped with a phase control device that is made in width 1 of an Mpulse modulator, a 2HE-I element, and two keys with an accumulator-master unit and a logic-device made type of keys, with the output of the mains voltage supply sensor connected; an organ, the output of which is connected to the inputs of a pulse-width modulator and element 2E-AND phase control unit i-i with three k1Bachami logical device, two second inputs

the first and second keys are connected and connected to the output of the fourth key of the logic device and to the accumulator-task block, which is also connected to the input of the fourth and

of the second keys of the logical device and also with the second input of the third kilogram of the logical device, the output of which is connected to the input of the sixth key of the logical device for the inverse

the input of which is connected to the input of the seventh key and the input of the analog-to-shtul converter, the input of which is connected to the output of the sug-1matory of the adjustable parameter, the second input is seventy71

The key of the logical device is connected to the output of the second key, the output of the first key is connected to the second input of a pulse-width phase control device whose control input is connected to the voltage source, and its output is the output of the 2NE-I element and the controller output and through the first the key of the phase control device is connected to

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the second input of the fourth key, the stroke of which is connected to the input of the second key of the phase control device, the second input of which and the output are connected respectively to the first and inverse inputs of the first key of the phase control device, and the output of the sixth key is connected to the second input of the fifth key key, the output of which is connected to the cumulative-setting unit.

I

S.

Compiled by O. Nakazna v Editor O. Golovach Tehred M. Morgental

Order 6995

Circulation 651

VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35., 4/5, Raushsk nab.

Proofreader M. Demchik

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Claims (1)

Claim A thyristor reactive power compensator regulator, containing a capacitor bank and a three-phase group of reactors with thyristor regulators connected to the terminals for connecting to a power supply network in parallel with the asymmetric load, load current sensors, power line tension sensors, via multiplication units, sensors, connected variable-speed adders and phase-to-phase functional converters controls, including zero-organs and analog-pulse converters, to the thyristor control unit, voltage source The reason is that, in order to increase reliability, the functional converter is equipped with a phase control device made in the form of a pulse-width modulator, 2HE-I element and two keys, an accumulative-setting unit and a logical device made in the form of seven keys, and the output of the voltage sensor of the mains is connected · :: pulorgan, the output of which is connected to the inputs of the pulse-width modulator and element 2HE-th phase control unit and with three keys of the logic device, two second input and the first and second keys are connected and connected to the output of the fourth key of the logical device and to the storage-setting unit, also connected to the inputs of the fourth and fifth keys of the logical device, as well as to the second input of the third key of the logical device, the output of which is connected to the input of the sixth key logical device, the inverse input of which is connected to the input of the seventh key and the input of the analog-pulse converter, the input of which is connected to the output of the adder of the adjustable parameter, the second input of the seventh could the key of the logical device is connected to the output of the second key, the output of the first key is connected to the second input of the pulse-width phase control device, the control input of which is connected to the voltage source, and its output is the output of the 2HE-I element and the output of the controller and through the first key of the phase device control is connected to the second input of the fourth key, you are a ₀ stroke is connected to the input of the second phase control switch device, the second input thereof and an output connected respectively to the first and in the inverse odes first phase control device key, and sixth key output is connected to the second input of the fifth switch, whose output is connected to an accumulative predetermined block. - 1443076