CN1983786A - Device for eliminating loop in inverter parallel running system - Google Patents
Device for eliminating loop in inverter parallel running system Download PDFInfo
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- CN1983786A CN1983786A CN 200510130610 CN200510130610A CN1983786A CN 1983786 A CN1983786 A CN 1983786A CN 200510130610 CN200510130610 CN 200510130610 CN 200510130610 A CN200510130610 A CN 200510130610A CN 1983786 A CN1983786 A CN 1983786A
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Abstract
The invention is concerned with a device avoiding direct current circumfluence of parallel connection moving system to inverter. Send the distilled AC signal from current signal separate circuit of AC and DC circuit to power counting circuit and send the signal of DC circuit to DC proportion gene adjusting circuit and make the inverted polarity of the signal. Send sine wave voltage signal outputted by sine value counting circuit and negative signal of DC circuit coming from DC proportion gene adjusting circuit to voltage excursion circuit, and send sine wave voltage signal added by sine wave voltage signal of voltage excursion circuit and the instantaneous value of negative signal of DC circuit as a new excursion voltage to single-phase inverter control circuit.
Description
Technical field
The present invention relates to static inverter system, specifically be particularly related to the device of eliminating dc loop-current in the single-phase inverter parallel system that uses the external characteristic droop method.
Background technology
The special power supply that with the single-phase inverter is core has been widely used in such as in the systems such as computer system, communication system, Medical Devices and aerospace equipment, along with for the capacity of this power supply and increasing day by day of stability requirement, using many single phase poaer supply parallel runnings is excellent engineering embodiments.But because the alternation of single phase poaer supply output voltage, the alternating voltage of each single phase poaer supply output all might be different on amplitude and phase place, therefore be easy to be created in the electric current that flows between each power subsystem, in order to be different from load current, this electric current that flows between each power subsystem is known as circulation.Two power supply parallel connections with Fig. 1 the right are that example describes: 10,14 single-phase inverter first, the single-phase inverter second that are respectively two parallel runnings, 24 is two load impedances that power supply is common, 15 is two circulation Icir between the power supply, and 16,17 are respectively output current Iz1, the Iz2 of two power supplys.The existence of circulation can cause the reduction of power supplying efficiency, under serious situation even can cause the collapse of whole power-supply system.
Comprise alternating current component and DC component in the output voltage of single-phase inverter, when many single-phase inverter parallels, the difference of the alternating current component of the output voltage of each single-phase inverter can produce interchange circulation, and the difference of the DC component of the output voltage of each single-phase inverter can produce dc loop-current.In order to eliminate the interchange circulation in the single-phase inverter parallel system, a kind of control method that is called the external characteristic droop method discloses for many years.For example, Ernane Antonio Alves Coelho, PorfirioCabaleiro Cortizo, with Pedro Francisco Donoso Garcia at IEEE commercial Application journal (IEEE Transactionson Industrial Applications), " the small-signal stability (Small-signal stability for parallel-connected inverters instandalone ac supply systems) of the inverter that in AC power supply system independently, is connected in parallel " that 2002 the 38th volumes, the 21st phases showed.This method comes from following theory: in the single-phase inverter parallel system, the power output of each single-phase inverter can be divided into reactive power and active power, and the difference on the amplitude will produce extra reactive power between described each single-phase inverter output voltage, and the single-phase inverter with big more output voltage amplitude will produce many more extra reactive powers; And the difference on the phase place will produce extra active power between each single-phase inverter output voltage, and the single-phase inverter with big more output voltage phase place will produce many more extra active power.According to this theory, manage to control each inverter of participating in parallel connection and make its circulation Icir=0, promptly neither circulation is not exported in input yet, and each inverter just can be participated in parallel connection easily.
Fig. 1 has also drawn and has used the external characteristic droop method to limit the functional-block diagram of the circulation of participating in a single-phase inverter 10 in parallel in the prior art.Control device by reference voltage circuit 50, magnitude comparator 51, phase comparator 52, sine value counting circuit 53, single-phase inverter control circuit 39, single-phase inverter major loop 22, voltage sensor 25, current sensor 23, power calculation circuit 56, idle ratio regulate 60, meritorious ratio regulate 59 totally ten parts form.The operator adjusts given amplitude and phase place according to active power and the reactive power that these single-phase inverter needs flow to load 24 at reference voltage circuit 50, and this amplitude and phase value are compared in magnitude comparator 51 and phase comparator 52 with the feedback signal of being regulated 59 by idle ratio adjusting 60 and meritorious ratio respectively and produced amplitude deviation 157 and phase deviation 158; According to deviate, sine value counting circuit 53 can calculate and export given voltage 152, and single-phase inverter control circuit 39 removes to control single-phase inverter major loop 22 according to given voltage 152 and produces required voltage amplitude and phase place; Single-phase inverter major loop 22 two ends are parallel with voltage sensor 25, the outflow end of the output current 16 of single-phase inverter major loop 22 also flows into end by lead 27 with the electric current of load 24 and is connected, lead 27 also is connected with the outflow end that another participates in the output current 17 of single-phase inverter 14 in parallel, the inflow end of the output current 16 of single-phase inverter major loop 22 also is connected with the electric current outflow end of current sensor 23 by lead 28, the electric current of current sensor 23 flows into end and is connected with the electric current outflow end of load 24 by lead 29, and lead 29 also is connected with the inflow end that another participates in the output current 17 of single-phase inverter 14 in parallel.The output signal 156 of voltage sensor 25 and the output signal 155 of current sensor 23 are input to power calculation circuit 56 respectively, power calculation circuit 56 calculates reactive power 159 and active power 160, they are admitted to idle ratio regulating circuit 60 and meritorious ratio regulating circuit 59 respectively, they become the signal of reactive power and active power can compare with amplitude of being come out by reference voltage circuit 50 and phase signal, and compare at magnitude comparator 51 and phase comparator 52 respectively, so just finished control to the external characteristic droop method of single-phase inverter 10.Participating in single-phase inverter in parallel for other also can follow the prescribed rules.
When prior art external characteristic droop method was used for the single-phase inverter parallel connection, every inverter all was independently, does not need mutual signal contact, and is therefore easier.Facts have proved that it is also very effective for eliminating interchange circulation, but it can not eliminate dc loop-current regrettably.
Summary of the invention
In order to solve the shortcoming that to eliminate dc loop-current when prior art external characteristic droop method is used for the single-phase inverter parallel connection, the invention provides a kind of device of eliminating dc loop-current.The present invention has done following improvement on the basis of existing technology:
1. after the output signal of current sensor, add an AC and DC current signal split circuit; Send into power calculation circuit by the AC signal that AC and DC current signal split circuit extracts.Send into direct current scale factor regulating circuit by the direct current signal that AC and DC current signal split circuit extracts, and in this circuit, make the polarity negate of signal.
2. between sine value counting circuit and single-phase inverter control circuit, add voltage offset circuits, all send into voltage offset circuits by the sinusoidal waveform voltage given signal of sine value counting circuit output and by the negative dc current signal that direct current scale factor regulating circuit comes, sinusoidal waveform voltage given signal makes the given voltage of sinusoidal waveform be offset the back and gives the single-phase inverter control circuit as the given voltage of new skew with negative dc current signal instantaneous value addition in this circuit.
3. said here AC and DC current signal split circuit is made up of two resistance, an electric capacity, an inductance; One end of electric capacity is connected with the output of current sensor, the other end of electric capacity is connected with an end of first resistance, the other end of first resistance is connected with public ground GND, and the capacitive reactance of pressing single-phase inverter output frequency calculating electric capacity numerically should be less than 1/10 of first resistance value.The tie point of electric capacity and first resistance is drawn the input that single line is received power calculation circuit, and they have constituted high pass filter, allows the alternating current component in the current sensor output signal is input to power calculation circuit.One end of inductance also is connected with the output of current sensor, the other end of inductance is connected with an end of second resistance, the other end of second resistance is connected with public ground GND, the induction reactance of pressing single-phase inverter output frequency calculating inductance numerically should be greater than 10 times of second resistance value, the tie point of inductance and second resistance is drawn the input that single line is received direct current scale factor regulating circuit, they have constituted low pass filter, allow the DC component in the current sensor output signal is input to direct current scale factor regulating circuit.
4. said here direct current scale factor regulating circuit is by an integrated operational amplifier, two anti-phase proportional amplifiers that resistance is formed: an end of first resistance is connected with this end for the input of this circuit, the dc current signal that is come by AC and DC current signal split circuit; The other end of first resistance is connected with an end of the negative input end of integrated operational amplifier and second resistance, and the other end of second resistance is connected with the output of integrated operational amplifier; The positive input terminal of integrated operational amplifier is connected with public ground GND.The output signal of this circuit is numerically equal to second resistance value divided by first resistance value with the ratio of input signal, and output is just in time opposite with input on polarity.Scale factor, be that output signal is relevant with concrete entire circuit structure with the ratio of input signal, its principle is to make the output voltage amplitude of the inverter of direct current scale factor regulating circuit output voltage representative equate that with the output voltage amplitude equivalent of the inverter of the given voltage representative of sine value counting circuit output their instantaneous value additions in voltage offset circuits are just meaningful like this.Simultaneously also suitable feedback quantity need be arranged, concrete numerical value needs to debug in the major loop DC component near till zero in conjunction with side circuit.
5. said here voltage offset circuits is by five resistance and two anti-phase adder and unit gain phase inverters that integrated operational amplifier is formed: got the end that anti-dc current signal is received first resistance by what direct current scale factor regulating circuit came, the output signal of sine value counting circuit is received an end of second resistance, the other end of first resistance, the other end of second resistance, one end of the 3rd resistance is associated in the negative input end of first integrated operational amplifier, the other end of the 3rd resistance is connected with the output of first integrated operational amplifier, the positive input termination public ground GND of first integrated operational amplifier; The resistance of first, second and third this three resistance all should equate, above circuit is an anti-phase adder, what the output signal of sine value counting circuit and direct current scale factor regulating circuit came like this has got anti-dc current signal in this addition, because dc current signal has been got instead in advance, subtracts each other so these two signals are actually.
An end of the 4th resistance is received in the output of first integrated operational amplifier again, one end of the other end of the 4th resistance and the 5th resistance, the negative input end of second integrated operational amplifier are connected together, the other end of the 5th resistance is received the output of second integrated operational amplifier, the positive input termination public ground GND of second integrated operational amplifier; The resistance of fourth, fifth resistance equates.Above circuit is a unit gain phase inverter, and the output of second integrated operational amplifier is the output of voltage offset circuits, and it receives the input of single-phase inverter control circuit.
The effect of voltage offset circuits is the negative feedback that has added the DC component of main circuit current in the given circuit of inverter, because do not comprise DC component in the given voltage by the output of sine value counting circuit, degenerative result makes the DC component in the major loop trend towards zero.
More than in 4,5 three used integrated operational amplifiers be three operational amplifiers in one the four unit integrated operational amplifier chip, by the positive and negative power supply power supply of symmetry.
Description of drawings
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is two single-phase inverter parallels and the prior art external characteristic droop method theory diagram of the application in single-phase inverter therein;
Fig. 2 is the present invention eliminates the embodiment of dc loop-current in the single-phase inverter of a participation parallel running a theory diagram;
Fig. 3 is the present invention, eliminates the elementary diagram of dc loop-current device embodiment in the single-phase inverter of a participation parallel running.
Embodiment
The present invention seeks to the dc loop-current when solving under the situation of prior art external characteristic droop method the restriction single-phase inverter parallel.Fig. 2 is the theory diagram that the present invention eliminates the dc loop-current device in the single-phase inverter of a participation parallel running.As seen from Figure 2, the present invention by reference voltage circuit 50, magnitude comparator 51, phase comparator 52, sine value counting circuit 53, voltage offset circuits 100, single-phase inverter control circuit 39, single-phase inverter major loop 22, voltage sensor 25, current sensor 23, ac and dc current demultiplexing circuit 110, power calculation circuit 56, idle ratio regulate 60, meritorious ratio regulates 59, direct current scale factor regulating circuit 120 totally ten four parts form.
Fig. 3 is a winding diagram of the present invention.The connection of circuit each several part all has public ground GND in each circuit segment of Fig. 3 as shown in Figure 3, their signal loop lines that all is connected together, and following narration is only carried holding wire and is not carried public ground GND.Given amplitude and the phase place of reference voltage circuit 50 outputs received magnitude comparator 51 and phase comparator 52 respectively, also received in magnitude comparator 51 and the phase comparator 52 by lead 67,66 respectively by the feedback signal that exchanges of idle ratio adjusting 60 and meritorious ratio adjusting 59; In comparator, they produce the amplitude deviation respectively and phase deviation is received sine value counting circuit 53 by lead 64,65; Sine value counting circuit 53 can be received the given input of voltage offset circuits 100 according to the determining voltage signal of giving of deviate calculating and sine wave output by lead 54; Receive the feedback input end of voltage offset circuits 100 by lead 104 by the direct current signal of DC component after transformation of scale and negate of the main circuit current of direct current scale factor regulating circuit 120; Produced the given voltage 154 of skew by the given voltage 152 of the sine wave of lead 54 by direct current signal 153 superpositions by lead 104 and received single-phase inverter control circuit 39 by lead 101 in voltage offset circuits 100, single-phase inverter control circuit 39 removes to control output voltage and the electric current that single-phase inverter major loop 22 produces major loops.The electric current outflow end of single-phase inverter major loop 22 is with 1 end of 1 end of receiving voltage sensor 25 by lead 27, load 24, also receive the electric current outflow end that other participates in single-phase inverter major loop in parallel.The electric current of single-phase inverter major loop 22 flows into end and receives 2 ends of voltage sensor 25, the electric current outflow end of current sensor 23 by lead 28.The electric current of current sensor 23 flows into end and receives 2 ends of load 24, also receives other electric current of participating in the current sensor that single-phase inverter connect in parallel and flow into end by lead 29.The output signal of current sensor 23 is received the input of AC and DC current signal split circuit 110 by lead 32, and the current signal input of power calculation circuit 56 received the alternating current component by AC and DC current signal split circuit 110 by lead 102; The output signal of voltage sensor 25 is received the voltage signal input of power calculation circuit 56 by lead 31; Power calculation circuit 56 goes out reactive power and active power according to above-mentioned two calculated signals, receives the input of idle ratio adjusting 60, meritorious ratio adjusting 59 respectively by lead 57,58.AC and DC current signal split circuit 110 is received the input of direct current scale factor regulating circuit 120 to direct-current component by lead 103 again, and the output signal of direct current scale factor regulating circuit 120 is received the feedback input end of voltage offset circuits 100 by lead 104.
The present invention has done following improvement on the basis of existing technology:
1. as shown in Figure 2, add an AC and DC current signal split circuit 110 in output signal 155 backs of current sensor 23; Send into power calculation circuit 56 by the ac current signal 150 that AC and DC current signal split circuit 110 extracts.Send into direct current scale factor regulating circuit 120 by the dc current signal 151 that AC and DC current signal split circuit 110 extracts, and in direct current scale factor regulating circuit 120, make the polarity negate of signal.
2. as shown in Figure 2, between sine value counting circuit 53 and single-phase inverter control circuit 39, add voltage offset circuits 100, all send into voltage offset circuits 100 by the sinusoidal waveform voltage given signal 152 of sine value counting circuit output and by the negative dc current signal 153 of direct current scale factor regulating circuit 120, make sinusoidal waveform voltage given signal be offset the back with negative dc current signal 153 instantaneous value additions at 100 li sinusoidal waveform voltage givens of voltage offset circuits signal 152 and send single-phase inverter control circuit 39 to as the given voltage 154 of new skew.
3. as shown in Figure 3, said here AC and DC current signal split circuit 110 is by two resistance R 8, R9, and 1, one inductance L of a capacitor C 1 is formed; 1 end of capacitor C 1 is friendship, the input of dc current signal split circuit 110, be connected with the output signal line 32 of current sensor 23,2 ends of capacitor C 1 are connected with 1 end of resistance R 9,2 ends of resistance R 9 are connected with public ground GND, the capacitive reactance of pressing the output frequency calculating capacitor C 1 of single-phase inverter numerically should be less than 1/10 of resistance R 9 resistances, capacitor C 1 is drawn the current signal input that a lead 102 is received power calculation circuit 56 with the tie point of resistance R 9, they have constituted high pass filter, allow the output of current sensor 23 is input to power calculation circuit 56 by the alternating current component in the signal of lead 32.1 end of inductance L 1 is also for handing over, the input of dc current signal split circuit 110, also be connected with the output signal line 32 of current sensor 23,2 ends of inductance L 1 are connected with 1 end of resistance R 8,2 ends of resistance R 8 are connected with public ground GND, the induction reactance of pressing single-phase inverter output frequency calculating inductance numerically should be greater than 10 times of resistance R 8 resistances, inductance L 1 is drawn the input that a lead 103 is received direct current scale factor regulating circuit 120 with the tie point of resistance R 8, they have constituted low pass filter, allow the output by current sensor 23 is input to direct current scale factor regulating circuit 120 by the DC component in the signal of lead 32.
4. as shown in Figure 3, here said direct current scale factor regulating circuit 120 is an operational amplifier U1A, two the anti-phase proportional amplifiers that resistance R 6, R7 form in four unit models by the positive and negative symmetrical power supply power supply integrated operational amplifier that is LF347: 1 end of resistance R 7 is the input of this circuit, is connected with this end by the dc current signal 151 of AC and DC current signal split circuit by lead 103; 2 ends of resistance R 7 are connected with 1 end of the negative input end 2 of integrated operational amplifier U1A and resistance R 6, and 2 ends of resistance R 6 are connected with the output 1 of integrated operational amplifier U1A; The positive input terminal 3 of integrated operational amplifier U1A is connected with public ground GND.The output signal 153 that makes this circuit is a scale factor K with the ratio of input signal 151, and K=-R6/R7 is then arranged.Scale factor K is relevant with the concrete structure of entire circuit, its principle is to make output voltage amplitude 18 and the sinusoidal waveform of single-phase inverter major loop 22 of output voltage 153 representatives of direct current scale factor regulating circuit 120 equate for the output voltage equivalent of the inverter of determining voltage signal 152 representatives, and their instantaneous value addition ability in voltage offset circuits is meaningful like this.Simultaneously also suitable feedback quantity need be arranged, concrete numerical value needs to debug in the major loop DC component near till zero in conjunction with side circuit.
5. as shown in Figure 3, here said voltage offset circuits 100 is anti-phase adder and the unit gain phase inverter that two operational amplifier U1B, U1C in the integrated operational amplifier of LF347 form by five resistance R 1, R2, R3, R4, R5 and four unit models: the anti-dc current signal of having got by direct current scale factor regulating circuit 120 is received 1 end of resistance R 1, the i.e. feedback input end of voltage offset circuits 100 by lead 104; The output signal of sine value counting circuit 53 is received 1 end of resistance R 2, the i.e. given input of voltage offset circuits 100 by the given voltage of lead 54; 1 end of 2 ends of resistance R 1,2 ends of resistance R 2, resistance R 3 is associated in the negative input end 6 of operational amplifier U1B, and 2 ends of resistance R 3 are connected with the output 7 of operational amplifier U1B, and the positive input terminal 5 of operational amplifier U1B meets public ground GND; The resistance of R1, R2, three resistance of R3 all should equate, above circuit is an anti-phase adder, the output signal 152 of sine value counting circuit and direct current scale factor regulating circuit 120 has got anti-dc current signal 153 in this addition like this, because dc current signal has been got instead in advance, subtracts each other so these two signals are actually.
1 end of resistance R 4 is received in the output of operational amplifier U1B again, the negative input end 9 of 2 ends of resistance R 4 and 1 end of resistance R 5, operational amplifier U1C is connected together, the other end of resistance R 5 is received the output 8 of operational amplifier U1C, and the positive input terminal 10 of operational amplifier U1C meets public ground GND; The resistance of resistance R 4, R5 equates.Above circuit is a unit gain phase inverter, and the output 8 of operational amplifier U1C is the output signal end of voltage offset circuits 100 and by lead 101 it is received the input of single-phase inverter control circuit 39.
As seen from Figure 3, the signal of receiving power calculation circuit 56 by lead 102 among the present invention be different by the signal of current sensor 23 logical lines 32 outputs, just the signal on the lead 102 has lacked DC component, and in addition, it is the same with the feedback path of Fig. 1.Therefore it is constant that this passage has kept the ability of prior art inhibition interchange circulation.What receive voltage offset circuits 100 through direct current scale factor regulating circuit 120 and lead 104 by lead 103 by AC and DC current signal split circuit 110 is negative-feedback signal, and the given voltage of voltage offset circuits 100 is sinusoidal wave, DC component is not answered this negative feedback to be suppressed to the direct-current component in the major loop and is leveled off to zero.When experimental results show that the interchange circulation when eliminating the single-phase inverter parallel connection with the external characteristic droop method, method of the present invention and device are very effective for eliminating dc loop-current.
Claims (4)
1, a kind of device of eliminating dc loop-current in the inverter parallel system, comprise reference voltage circuit [50], magnitude comparator [51], phase comparator [52], sine value counting circuit [53], single-phase inverter control circuit [39], single-phase inverter major loop [22], voltage sensor [25], current sensor [23], power calculation circuit [56], idle ratio is regulated [60], meritorious ratio is regulated [59], it is characterized in that: output signal [155] back in current sensor [23] adds a friendship, dc current signal split circuit [110] adds voltage offset circuits [100] between sine value counting circuit [53] and single-phase inverter control circuit [39]; Given amplitude and the phase place of reference voltage circuit [50] output received magnitude comparator [51] and phase comparator [52] respectively, regulates the feedback signal that exchanges of [59] coming by idle ratio adjusting [60] and meritorious ratio and also receives in magnitude comparator [51] and the phase comparator [52] by lead [67], [66] respectively; In comparator, they produce the amplitude deviation respectively and phase deviation is received sine value counting circuit [53] by lead [64], [65]; Sine value counting circuit [53] calculate according to deviate and sine wave output give determining voltage signal [152], and receive the given input of voltage offset circuits [100] by lead [54]; The direct current signal [153] of DC component after transformation of scale and negate by the next main circuit current of direct current scale factor regulating circuit [120] received the feedback input end of voltage offset circuits [100] by lead [104]; The given voltage [152] of the sine wave that is come by lead [54] in voltage offset circuits [100] is produced skew given voltage [154] by direct current signal [153] superposition that is come by lead [104], and receive single-phase inverter control circuit [39] by lead [101], single-phase inverter control circuit [39] control single-phase inverter major loop [22] produces the output voltage and the electric current of major loop; The electric current outflow end of single-phase inverter major loop [22] is with 1 end of 1 end of receiving voltage sensor [25] by lead [27], load [24], also receive the electric current outflow end that other participates in single-phase inverter major loop [22] in parallel; The electric current of single-phase inverter major loop [22] flows into end and receives 2 ends of voltage sensor [25], the electric current outflow end of current sensor [23] by lead [28]; The electric current of current sensor [23] flows into end and receives 2 ends of load [24], also receives other electric current of participating in the current sensor that single-phase inverter connect in parallel and flow into and hold by lead [29]; The output signal [155] of current sensor [23] is received the input of AC and DC current signal split circuit [110] by lead [32], and the current signal input of power calculation circuit [56] received alternating current component [150] by AC and DC current signal split circuit [110] by lead [102]; The output signal [156] of voltage sensor [25] is received the voltage signal input of power calculation circuit [56] by lead [31]; Power calculation circuit [56] goes out reactive power [159] and active power [160] according to above-mentioned two calculated signals, receives the input that idle ratio is regulated [60], meritorious ratio adjusting [59] by lead [57], [58] respectively; The input of direct current scale factor regulating circuit [120] received direct-current component [151] again by AC and DC current signal split circuit [110] by lead [103], the output signal [153] of direct current scale factor regulating circuit [120] is received the feedback input end of voltage offset circuits [100] by lead [104], and makes the polarity negate of signal in direct current scale factor regulating circuit [120].
Send into voltage offset circuits [100] by the sinusoidal waveform voltage given signal [152] of sine value counting circuit [53] output and by the negative dc current signal [153] that direct current scale factor regulating circuit [110] comes, make the given voltage of sinusoidal waveform be offset the back with negative dc current signal [153] instantaneous value addition at voltage offset circuits [100] lining sinusoidal waveform voltage given signal [152] and give single-phase inverter control circuit [39] as the given voltage of new skew [154].
2, according to the device of dc loop-current in the described elimination inverter parallel of claim 1 system, it is characterized in that AC and DC current signal split circuit [110] by two resistance R 8, R9,1, one inductance L of a capacitor C 1 is formed; 1 end of capacitor C 1 is friendship, the input of dc current signal split circuit [110], be connected with the output signal line [32] of current sensor [23], 2 ends in addition of capacitor C 1 are connected with 1 end of resistance R 9,2 ends of resistance R 9 are connected with public ground GND, the capacitive reactance of pressing the output frequency calculating capacitor C 1 of single-phase inverter numerically should be less than 1/10 of resistance R 9 resistances, capacitor C 1 is drawn the current signal input that a lead [102] is received power calculation circuit [56] with the tie point of resistance R 9, they have constituted high pass filter, allow the output of current sensor [23] is input to power calculation circuit [56] by the alternating current component [150] in the next signal [155] of lead [32]; 1 end of inductance L 1 is also for handing over, the input of dc current signal split circuit [110], also the output signal line 32 with current sensor [23] is connected, 2 of inductance L 1 is connected with 1 end of resistance R 8,2 ends of resistance R 8 are connected with public ground GND, the induction reactance of pressing single-phase inverter output frequency calculating inductance numerically should be greater than 10 times of resistance R 8 resistances, inductance L 1 is drawn the input that a lead [103] is received direct current scale factor regulating circuit [120] with the tie point of resistance R 8, they have constituted low pass filter, allow the output by current sensor [23] is input to direct current scale factor regulating circuit [120] by the DC component [151] in the next signal [155] of lead [32].
3, according to the device of dc loop-current in the described elimination inverter parallel of claim 1 system, it is characterized in that direct current scale factor regulating circuit [120] is an operational amplifier U1A, two the anti-phase proportional amplifiers that resistance R 6, R7 form in four unit models by the positive and negative symmetrical power supply power supply integrated operational amplifier that is LF347: 1 end of resistance R 7 is the input of this circuit, is connected with this end by the dc current signal [151] of AC and DC current signal split circuit by lead [103]; 2 ends of resistance R 7 are connected with 1 end of the negative input end 2 of integrated operational amplifier U1A and resistance R 6, and 2 ends of resistance R 6 are connected with the output 1 of integrated operational amplifier U1A; The positive input terminal 3 of integrated operational amplifier U1A is connected with public ground GND; The output signal 153 of this circuit is a scale factor K with the ratio of input signal 103, K=-R6/R7; The output voltage amplitude 18 of the single-phase inverter major loop 22 of output voltage 153 representatives of direct current scale factor regulating circuit 120 equates for the output voltage equivalent of the inverter of determining voltage signal 152 representatives with sinusoidal waveform, simultaneously also suitable feedback quantity need be arranged, concrete numerical value needs to debug in the major loop DC component near till zero in conjunction with side circuit.
4, according to the device of dc loop-current in the described elimination inverter parallel of claim 1 system, it is characterized in that voltage offset circuits [100] is anti-phase adder and the unit gain phase inverter that two operational amplifier U1B, U1C in the integrated operational amplifier of LF347 form by five resistance R 1, R2, R3, R4, R5 and four unit models: receive 1 end of resistance R 1, the i.e. feedback input end of voltage offset circuits [100] by lead [104] by the anti-dc current signal [153] of having got that direct current scale factor regulating circuit [120] comes; The given voltage [152] that the output signal of sine value counting circuit [53] is come by lead [54] is received 1 end of resistance R 2, the i.e. given input of voltage offset circuits [100]; 1 end of 2 ends of resistance R 1,2 ends of resistance R 2, resistance R 3 is associated in the negative input end 6 of operational amplifier U1B, and 2 ends of resistance R 3 are connected with the output 7 of operational amplifier U1B, and the positive input terminal 5 of operational amplifier U1B meets public ground GND; The resistance of R1, R2, three resistance of R3 all should equate, above circuit is an anti-phase adder, what output signal of sine value counting circuit [152] and direct current scale factor regulating circuit [120] came like this has got anti-dc current signal [153] in this addition, because dc current signal has been got instead in advance, subtracts each other so these two signals are actually.
1 end of resistance R 4 is received in the output of operational amplifier U1B again, the negative input end 9 of 2 ends of resistance R 4 and 1 end of resistance R 5, operational amplifier U1C is connected together, the other end of resistance R 5 is received the output 8 of operational amplifier U1C, and the positive input terminal 10 of operational amplifier U1C meets public ground GND; The resistance of resistance R 4, R5 equates.Above circuit is a unit gain phase inverter, and the output 8 of operational amplifier U1C is the output signal end of voltage offset circuits [100] and by lead [101] it is received the input of single-phase inverter control circuit [39].
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| CN1303739C (en) * | 2003-05-20 | 2007-03-07 | 西安交通大学 | Automatic master-slave parallel control method for sine pulse width modulation inverter power supply |
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