SU1001433A1 - Control of group of pulse converters - Google Patents

Description

(5) DEVICE FOR CONTROLLING A GROUP OF PULSE CONVERTERS

The invention relates to electrical engineering. The system can be used to control the voltage (current, power, temperature of a consumer group, for example heating; from installations. A device is known for controlling a group of converters with all of the variable-voltage sensor converters connected in series into the feedback feedback circuit 11 (voltage, current, power of the temperature), low-pass filter (.periodic link, integrator), relay and summing elements and the shred control circuit "1 and from the connected between the output relay elements devices of mutual synchronization, which are controlled alternating sawtooth voltage generators 1,. The disadvantages of this device are increased voltage fluctuations of the mains due to non-phase switching on and off of the leading and leading 1x regulators, leading to reduced 1st energy indicators. The closest to the proposed | (y is a device for controlling a group of impulse transducers, connected according to a master-slave scheme, covered, each by a reverse circuit, having a relay element , an adjustable-value sensor and a low-pass filter, and containing a synchronization unit, a control unit and a relay element of the feedback circuit of the master transducer connected to the synchronization unit of the slave transducer and the control unit of the master transducer via the delay element C 2 X A disadvantage of the known device is that alternately sequential synchronization of converters causes significant fluctuations in the cycle duration pa (5s of each converter with respect to mean,.

unweighted cycle time, which leads to significant changes in the amplitude of the resulting current of a group of transducers, resulting in increased voltage fluctuations of the network and deteriorating energy performance.

The purpose of the invention is to improve the energy performance and reduce the impact on the power supply network of a group of subordinately synchronized converters. ,

The goal is achieved by the fact that the ramp signal driver is made in. clock generator, counter, digital-analog converter, two-input coincidence elements, the output of the clock generator connected to the counting input of the counter, whose outputs are connected to the digital-analog converter, as well as the first inputs of the two-input matching elements to the cc corresponding to the counter inputs, output the largest counter code is connected to the smallest of the undetected counter inputs, and the second bypass of the matching element of the former linearly changes the signal podklyucheny to dynamic output channel of the previous delay element ,. which is the output of this channel.

In addition, the device is equipped with a pulse shaper and elements AND and OR, the first. Input is connected to the output of the element AND, the first input of the element AND is connected to the input of the shaper of a linearly varying signal, and the second input through the pulse generator, connect to the output of the delay element, the dynamic output of the delay element is connected to the second input of the OR element, the output of which is the channel output.

FIG. 1 presents junctional. on the scheme of two converters in the mutual synchronization circuit of many converters; in fig. 2 is a diagram of a ramp signal generator of a synchronization unit with a reset element and a reset level setting; in fig. 3 and - timing diagrams explaining the operation of the converter group control system.

The device (Fig. 1) consists of master 1 and slave 2 channels connected to network 3 and working on their own

load, power key element-converter 5 (for example, thyristor) sensor 6 of regulation Yu value, connected to the output of converter when electric value of power stabilizes) or to load at stabilization of technological value (temperature; low-pass filter 7 (integrator) with totalizers 8 at the input and 9 at the input, p, the unloading element 10, the output of which through the delay element 11 is connected to a device for controlling a group of pulse converters. Between the dynamic output of the leading channel element 11 and Adder swing member 9 guided channel included shaper linearly i3men dissolved EGOS signal 12 to the input 13, conn) chennym to the previous channel. Additionally, the pulse former 1 and the elements AND 15 and OR 1b are entered, the first input of which is connected to the output of the element AND, and the second input to the dynamic output of the delay element 11, and the output of the element OR 1b is connected to the driver of the linearly varying signal 12 of the slave channel , the first input of the logic element AND 15 is connected to the output of the element OR 16 of the leading channel, and the second input through the pulse shaper AND is connected to the delay element 11 of the channel.

Claims (2)

The linearly varying signal driver, functionally including a reset element and a reset level value setting element (FIG. 2), is designed as a digital counter 17 with an output digital-to-analog converter 18 and a clock pulse generator 1 connected between the network voltage and the counting the input of the counter 17, the elements of the matches are made in the form of two-input elements And, and the output of the first element 20 is connected to the input of the installation of the counter. zero {input 11.), the output of the second 21 - to the installation input of units (input Si), the input of the third 22 - to the installation input of two 1 input S2), etc. if the reset level setting element has a greater number of positions than shown in FIG. 2. The output of the largest code of the counter 17 is connected to the lowest of the unused inputs of the installation, the outputs of the smaller codes of the counter 17 are sequentially connected to the first inputs of logic elements, and the second inputs of these elements are combined and connected to the dynamic output of the delay element 11 of the master converter {FIG. . one),. The operation of the device for controlling a group of converters is illustrated by the example of the work of a group of three converters (FIG. 3) operating with a weighted average cycle time TV, Sfc D with the period of the supply voltage, At a time point -0 (fig 3) in about half the period of the mains voltage until the current of the first converter (Fig. 3a) is turned off; at the dynamic output of its element 11 pulse de-energizing switch Soig, a synchronization pulse ffig is generated. 3 b, which is fed to the input of a linear variable shaper signal 12 (Fig. 1), namely, the inputs of coincidence elements 20-22 (Fig. 2) Since at the time point it is a counter, 17 code n, which is fed to the second input element 2 & coincidence, then at the output of element 20 coincidence there will be a pulse that sets the counter 17 to zero and the output of the DAC 18 generates a zero level of the linearly varying mutual synchronization signal (Fig. 3 V, solid line). This signal goes to the adder 9 the second slave channel (fig. 1), where it is subtracted from the output signal low pass filter 7 (FIG. 3, dashed lines), and the difference of these signals is supplied to relay element 10. When the output signal of low pass filter 7 is greater than the linearly varying signal of the former of the linearly varying signal 12, or when the dashed line becomes higher than solid (Fig. 3c), then the relay element 10 turns on and supplies a signal (Fig. 3g) to the converter 5 (Fig. 1) of the second channel, designed so that regardless of the arrival of signals to turn it on and off, the sledge is turned on and shutdowns occur only the zero point of the mains voltage from positive to negative values. In this case, the current of the second converter is shown in FIG. 3d- Thus, at the time t, the moment of turning off the master converter (Fig. 3a) with the moment of switching on the slave converter (Fig. 33) is ensured exactly. "At time to, the relay element of the second channel turns off (Fig. 3c, d) , and at time t, a synchronization pulse (Fig. 3e) is generated at the dynamic input of the delay element 11 (Fig. 1) of the second channel, which is fed to the input of the linear transverse signal changer .12 of the third channel. At the output of the former 12, a linearly varying signal is generated (Fig. 3, solid line), which is fed to the third channel adder 9, where it is subtracted from the output signal of the low-pass filter 7 (Fig. 3, dotted line). At the same moment of time, the relay element 10 of the third channel is turned on (Fig. 3e), and its converter is turned on at the time fc (Fig. 3 and. At the time-tjj one input of the matching element 18 (Fig. 2) a synchronization pulse is received (Fig. 3 b), and a signal from the code (And + 1 counter 17 (Fig. 2)) is sent to another input, as a result of which the output of the coincidence element 18 will be a signal that sets the counter to code 1 At the time t, the counter 17 is set to zero in the same way as at the time t. Thus: the cycles are repeated. (Level 1 of the reset signal of a linearly varying signal with an increase in the cycle time of the master converter (Fig. 3a) the cycle time of the slave converter decreases (Fig. 3 d) and vice versa. This ensures the amplitude of the change in the resulting current of the converter group (Fig. 3 k) with the same current of full connection of all converters equal to the amplitude of the current of one converter. The operation of the device for controlling a group of converters for large (similarly and for small) tasks is explained in FIG. k using the example of a group of three transducers, in which the second transducer is working with a large assignment. In time 1 tft from the master of the 1st channel (Fig. "A) a synchronization pulse is received (Fig. (B) to the 2nd slave converter. As a result of a large task, the second converter is in the on state before the arrival of the synchronization pulse from the master channel remains in the on state (fig. hc) and the following. power supply periods after the arrival of the synchronization pulse. At the time of arrival of the synchronization pulse to the first input of the And 15 element (fig. 1), i.e. at time t, at its second input, because the pulse impulse element is turned off 11 (Fig. "1) the second converter is in the static state | (Fig. f g); the pulse shaper (Fig. 1) is also supported by the signal (Fig. 4 e). From the output of the AND 15 element (Fig. 1,. Fig. k (e), element 1, OR 16 (Fig. 1), the signal is fed to the input of the former of the linearly varying signal (Fig. g) of the third channel, which is turned on (Fig. e) at the nearest moment of voltage transition from the power supply network positive values are negative. At time t. (Fig. 4) approximately in half the period of the supply voltage before r-yukeni that the second channel is turned off ((Hr.tB) its element 11 of the impulse de-energization is triggered (Fig. 1, Fig. Jt g) and at its dynamic output A synchronization pulse runs through the OR 16 element to the input of the linearly curved third channel shaper (Fig. 4g), which is then turned on (Fig. 3). At the time t of the first converter, a synchronization pulse arrives at the second (Fig. 4 b. Since at this point in time the second channel is in The switched off state (fig. c), then its pulse element 11 from switching off is triggered (fig. d), and on) the output of the driver I pulses (fig. 1 the pulse disappears (fig. d). As a result, the synchronization pulse from the first The channel through the second channel element 15 does not pass to the input of the generator of the linearly varying signal of the third channel (Fig. 4c). And at the nearest moment of time, the supply voltage does not go over from the positive value in the output channel. . 4 c). . At time point -fc, the operation of the device & ystaa is repeated in the same way as in time point b. As a result of connecting elements 15 and PLI 16 and pulse generator It (Fig. 1 /, the amplitude of changes in the resulting current of the converter group (Fig. 4)) and for large (small quantities), with the same total current, all the converters are maintained equal to the current amplitude one converter. Thus, the present invention provides a more uniform network load for a group of converters () and as a result improves energy performance. Formula 1: Device for controlling a group pulse converters containing in each channel the number of converters adjustable sensor connected to the first input of the first accumulator, the second input of which is intended for connecting the reference block, the output of the first adder is connected via a low-pass filter to the first input of the second sum of the atom, the second input of which is connected to the output of the generator of a linearly varying signal with a reset element, and the output is connected through a relay element to the delay element whose output is intended to connect to to the converter, the output of the previous channel is connected to the input of the linearizer of the variable signal. It is different in that, in order to improve the energy performance, in each channel element, the delays are equipped with a dynamic output, and the linearly variable signal shaper is designed as a clock pulse generator, counter, digital-to-analog converter, two-input elements of coincidence, and the output of the clock generator is connected to the counting input of the counter, the outputs of which are connected to the digital-analogue th transducer, and through the first inputs of two-input coincidence .elementov to respective inputs of the meter, most of the code counter output is connected to the lowest of the unused inputs of the counter, and second inputs of the coincidence of elements linearly varying signal shaper yuschegos podk.pyucheny to dyn 1cheskomu the output of the delay element of the previous channel, which is the output of this channel .. 2. The device according to claim 1, 1 and 2, so that it is equipped with a pulse shaper and AND and OR elements, the first of which is connected to the output of the AND element, the first input of the AND element is connected to the input of the driver of the variable signal, and the second input through the form of the JOB The pulse is connected to the output of the delay element, the dynamic output of the delay element is connected to the second input of the OR element, the output of which is the channel output. Sources of information taken into account in the examination 1. Author's certificate of the USSR N 377752, cl. H 02 R 13/16, 1973. 2. USSR author's certificate If 588613, class, H 02 R 13/16, 1973. giving FIG. 2 v / 4f-ifjAl I II g f.i, vAA LLL-LA -J1 f  / / / / WV4VW | V A / / WMyv. Pur3