SU1702482A1 - Method of dynamic compensation for nonactive components of power - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to the device for compensating inactive power components, and can be used in power supply systems of electrical and power circuits with distorting loads to improve transmission efficiency and quality of power consumption in any current and voltage waveforms. The improvement of the quality of compensation of inactive components of the current power in a node or voltage in the circuit during non-sinusoidal energy processes. The instantaneous values of ggsgs i (t) of the load and voltage U (t) of the source or voltage U (t) of the load and current l (t) of the source are measured when the source operates in the mode of an EMF generator or a current generator, which are decomposed into harmonic the components li (t) and Ux (t), with a subsequent shift by a quarter of the period of the eigenfrequencies to obtain conjugate harmonics k (t) and Oi (t), identify the like (K L) and missing in the voltage spectrum of the source harmonic of the load current or harmonics of the load voltage missing in the spectrum of the current source for the compensation p on the current in the node and 1 and the voltage in the circuit, the current signal is optimized by the current signal I0m (0 or voltage. Kksm (t) compensation 1k0m (0 .V 2) lL (thUK (t) lL (t) hV K LU ( t) + U (t) L (t), uOM (t) 2 l & K (t) IL (t) (t) + TL (t) SL c: -UK (T) L (t) U (t) which drive to the current level (voltage) of the supply network and generate it to the network. 2 ill. VJ O Yu SO

Description

The invention relates to electrical engineering, in particular to devices for compensating inactive power components, and can be used in power supply systems of electrical and power circuits with distorting loads to increase the efficiency of transmission and consumption of electricity under any form of current and voltage curves.

The purpose of the invention is to improve the quality of compensation of inactive components of power over current in a node or voltage on a circuit during non-sinusoidal energy processes.

FIG. 1 shows a block diagram of a device for transverse current compensation in a node; on F.-ir 2 - structural scheme

longitudinal voltage compensation devices in the circuit.

The transverse compensation device for the inactive components of power in a node contains a (n + m) channel control parameter generating device, which consists of voltage sensors 1 and current 2 connected respectively to the terminals of the source and the load bus, and - to the inputs of the active harmonic filters 3 and 4 (AFG), n and m of the outputs of which are connected to (nl m) Examiners of the comparison circuit 5 (CC), connected to the output of the controller with 2m control inputs of the controller: (6 K), informational m inputs of the hcto are connected to the AF outputs of the same name 4; phase-shifting resist 7 and 8 (FSU); generators 9 and 10 of quadratic functions, 2n of the inputs of which are connected to the same-name outputs of AFG 3 and FSU 7, and n outputs to the inputs of the adder 11 connected to the second n inputs of the 12, the first n inputs of which are connected to RYHODEM FSU 7: Multipliers 13 and 14, the first n inputs of which are connected with the same name outputs of AFG 3 and FSU 7, and the second - with the same outputs of FSU 8 and K 6, the outputs of which are connected to the summing and subtracting inputs of the adder 15; a multiplier 16 connected by its first and second leads to the outputs of the divider 12 and the adder 15; adders 17 and 18, the inputs of which are connected to (tn) vyhldyam switch b and n outputs of the multiplier 16; adder 19, the summing input of kg: 0 is connected to the output of the adder 18, and the subtracting input is connected to the output of su g-hztar 17 as well as an executive device consisting of a voltage transformer 20, the primary threshing of which is the load of the supply network, and the secondary is included in the diagonal of the direct current of the rectifier 21, the smoothing filter 22, the unipolar input of which is loaded on the diagonal of the direct current of the rectifier Metel 21, and the positive and negative outputs are the power inputs of a push-pull key amplifier 23 of class AD, and the neutral output is connected to the zero bus network; a smoothing throttle 24 connecting the output of the amplifier 23 to a non-zero bus network; a current sensor 25 connected at the input between the choke 24 and a non-zero bus, and at the output to the subtractive input of the adder 26 connected to the adder with the adder 19; a composer 27 connected to the input to the output of the adder 26. and the direct and inverse outputs to the inputs of the amplifier 28, i-moves

which are connected to the control input of the 1k off-key amplifier 23.

Device for independent compensation of ecgcheche. so; tz "zayuschy power to

The l-IT-loop and the circuit contains (n + gm) camine io device for the formation of a control parameter, which consists of current sensors 1 and voltage 2, connected appropriately to the source bus and load terminals, and to the inputs of active filters 3 and 4 harmonics, the power outputs of which are connected to (n + m) tons. in comparison circuit 5, connected to the j output with 2m control inputs

b of switch 6, informational inputs are co-connected to the same-name outputs of LFG 4; phase shifters 7 and 8; r of 9 and 10 quadratic functions; UVH; w. to the second (. with one of them; these. and Sun, odes of AFG 3 and FSU 7, and p - with the inputs of the adder 11, connected, l (for the second n inputs of the divider 12. peg. g ; n inputs of which are connected to Bi / o / taM FSU 7. multipliers 13 and 14, first input inputs, which are connected with the same name of the AFG 3 and FSU 7, and the second with the bottom ports of FSU 8 and K 6, -.- ;; .dys of which. Respectively to the summing and subtracting inputs

0 adder 15, an multiplier 16 connected by the first and second n inputs of the first and second inputs to depot 12 and adder 15;

HUMS ZGOOOE 17, 1 ,, INPUTS OF COUNTRY CONNECTION to fvm-n) outputs of switch 6 and n

B Vmkodm multiplier 16; summgoram 19. a summing input of which is connected to the output of up to 1 adder 18. and the subtractive input is connected to the output of the gum spore 17 as well as the primary unit t) 0 consisting of a spring 0 connected to the consumer and loaded onto a smoothing filter 22, the positive and negative outputs of which expand the power supply for a push-pull glyuchevogo amplifier 23 class AL), and the zero output is connected to the zero bus Filter 29, a non-zero bus of which is the output of the amplifier 23: voltage transformer 20, which is the filter load

0 29. The secondary winding of which is included in the non-flexible supply line bus; rectifier 30. connected to the input with voltage sensor 2, and the output pin with filter 31 connected to the summing input of sum5 of motor 32, the subtracting input of which is connected with the output of voltage sensor 33; the adder 34, the first input of which is the output of the adder 19 (the control parameter generating device), and the second E.OUT - the output of the adder 32: switch 35, connected to the outputs of the adder 32 and the generator 36 of the modulating function, and amplifier 28 - with information inputs of amplifier 23.

A transverse current compensation device in a node that implements a method for dynamically compensating inactive power components, works as follows.

Voltage sensors 1 and current 2 measure voltages that are proportional to the instantaneous values of the source voltage u (t) and load current l (t). The measured signals are fed to the inputs of active harmonic filters 3 and 4, the outputs of which form harmonic components of the source voltage UK (t) (K-1, n) and load current l (t) (L-1, m). The comparison circuit 5 analyzes the spectral composition of the measured signals and controls the switch o, which passes the same-harmonics with the voltage of the current to the inputs of the n channels of the FSA 8 and i / multiplier 14, and channels with the voltage of the harmonics of the inputs adder 17. Multipliers 9 10, 13, 14 16. adders 11 and 15 and a divider of 12 hours of each of its n channels generate signals

UK (About

U (t) -) - U (t)

tUK (t) lL (t) -UK (t) lL (t)

0)

at. where do harmonic4 UK (I). ii (t) phase shifting devices 7 and 8 are implemented by a quarter of a period of natural frequencies. Adder 18 performs the addition of functions at the n outputs of the multiplier 16, and adder 17 adds the mismatched voltage of the current harmonics. The difference between the amounts obtained determines the adder 19, as a result An adder 26 receives a signal formalized by expression (1).

During the operation of the device, the transformer: mountains 20, the rectifier 21 and the filter 22 provide two-pole power supply to the amplifier 23 operating in the key mode, the output current of which is choked by the choke 24. When the control signal of the amplifier 23 is generated, the sensor 25 tscae with the transformation ratio In terms of current transformer ratio, current sensor 2 measures instantaneous voltages proportional to compensation current. The adder 26 determines the mismatch between the control and the generated current compensation signals. The comparator 27 of the error signal generates two inverse

imput the same psi ..- onztelnpsti on jonu SHIR. A usitel. 28 provides the necessary / ol power capacity of control instances. The key amplifier 3 with a filter 24 throttle form a “PL-BVIO current, repeat the shape of the control signal at the summing descent of the sum of ooo 26, which is generated into the mains supply.

Longitudinal compensation device

in the circuit voltage, implementing sposs-5 of dynamic compensation of inactive power components works as follows.

The sensors of toga 1 and voltage 2 measure voltages proportional to the instantaneous values of source current i (t) and load voltage U (t). The measured signals are fed to the inputs of active harmonic filters 3 and d, each of the channels of which selects one or another harmonic component of the source current it (t) (L 1.p) and their load voltage Ui (t) (, m) thereby decomposition into

rd Fourier. Comparison Gheme 5 compares the spectral composition of the measured signals and controls the switch, which passes the voltage of the same harmonics to the inputs of the n channels through n channels.

phase separator 8 and multiplier 14, and the pp (Tt-n) channels are opposite harmony to the inputs of the adder 17. FSO 7 and 8 shift the like harmonics of current and voltage by a quarter of the period of natural frequencies Multipliers 9, 10, 13 14. 16. Adders 11 and 15 and divider 12 in each of the n of their channels form signals

-and - fUK (t) i (tHMt) n (tj

2-2

iL (t) + IL (t)

when Adder 18 performs the addition of Functions n all n outputs of the multiplier

16, and the sum of the mountains 1 is the complication of mismatched with TOKOV naprheny glrmgchik. The difference in the amounts received is determined by the adder 19, as a result of which, the adder 34 receives a signal whose function corresponds to

(proportional to) voltage compensation.

During operation of the device, the rectifier 21 v filter 22 provides dual power supply to the amplifier 23 operating in the key mode, the output voltage of which is filtered by the filter 29. The rectifier 30 and the filter 31 convert the alternating voltage when forming the control signal for the amplifier 23. proportional to the instantaneous value of the load voltage, to a constant. Rectifier 21 and voltage sensor 33 convert the alternating voltage at the source terminals into a proportional constant, where the division factor of the sensor 33 is equal to the transformation ratio of sensor 2. The adder 32 calculates the difference of the constant voltages at the outputs of the sensors 31 and 33, which is summed with voltage proportional to the compensation voltage by means of the adder 34. This allows to take into account the mismatch of the source and consumer voltages, which is important when generating the control signal by the amplifier 23 according to the law pulse width modulation. The modulation is implemented by a comparator 35, the first input of which receives a compensation voltage signal taking into account the voltage source and load voltage mismatch, and the second - a signal of the modulating function generator 36, whose frequency is 6-8 times higher than the frequency of the maximum harmonic voltage of the load voltage. The modulated signal through the amplifier 28, which provides the necessary power of the control signal, is supplied to the information inputs of the amplifier 23. To the power supply network, a compensation voltage is generated by the voltage transformer 20.

The proposed method of dynamic compensation allows to improve the quality of the energy consumed and to compensate for inactive power components in non-sinusoidal energy processes in terms of both the current in the node and the voltage in the circuit.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A method for dynamically compensating for inactive components of power with respect to current in a node or voltage in a circuit, comprising the fact that voltage is measured. proportional to the instantaneous values of the current l (t) of the load and the voltage U (t) of the source or the voltage U (t) of the load and the current i (t) of the source during the operation of the source, respectively, in the mode of the EMF generator or current vibrator, which are decomposed into harmonics ii (t), LK (t) with a subsequent shift by a quarter of the period of its own parts, receiving the conjugate harmonics li (t), UK (T), and generate a supply network with 1 com (x) or UKOM voltage compensation, characterized in that, in order to improve the quality of compensation of inactive components, the current power in the node or voltage in circuit with non-sinusoidal energy processes, the like () and voltage of the harmonic source of the load current (L K) that are not in the spectrum of the source are distinguished ( the current in the node or the harmonics of the source of the load voltage (K L) missing in the spectrum of the current when compensating for the voltage in the circuit, generate a current signal or a compensation voltage lw, M ( -2 2 UK®-a UKt) lL ((t) lL (t) -V ICT).  (t) -fU (t) Vl " Ј1 Uw W KSL-r2 -.-. - Uc.W lift) il (t) + k (t) HMiKWh Ј UK (t), which leads to mains level. hnoshop Sl / UjJUV) 1utuiJ