CN103280955A - Direct current side harmonic suspension system and method of double-inverted-star-shaped thyristor rectifying system - Google Patents
Direct current side harmonic suspension system and method of double-inverted-star-shaped thyristor rectifying system Download PDFInfo
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Abstract
The invention discloses a direct current side harmonic suspension system and method of a double-inverted-star-shaped thyristor rectifying system and belongs to the technical field of power electronics. The problem that an existing double-inverted-star-shaped thyristor rectifying system can produce a large number of harmonic waves due to strong nonlinearity is solved. A phase voltage signal of alternating current input of a double-inverted-star-shaped transformer is collected by a synchronization and phase control circuit, a standard triangular wave signal is generated after filtering and phase control are conducted and input to a signal processing and control circuit, two PWM driving signals which are provided with dead areas respectively are generated by the signal processing and controlling circuit, the PWM driving signals are output to a third harmonic generation current triangular wave inverter circuit after power amplification is conducted on the PWM driving signals through a driving circuit, an auxiliary edge current value of a balance reactor is adjusted, an auxiliary edge current peak value of the balance reactor with an auxiliary edge is made to be 0.5 time that of a loading return circuit current value through current closed-loop control, and a first negative peak value point of the auxiliary edge current of the balance reactor in each power frequency period lags behind an alternating current input phase voltage alpha. The direct current side harmonic suspension system and method of the double-inverted-star-shaped thyristor rectifying system is suitable for low-voltage large-current situations.
Description
Technical field
The DC side harmonic wave that the present invention relates to a kind of double reverse-stars type thyristor rectifier system suppresses system and method, belongs to electric and electronic technical field.
Background technology
In commercial Application such as metallide, often need the adjustable DC power supply of low-voltage, high-current (for example tens volts to tens volts, the hundreds of peace is to several Wan An), double reverse-stars type scr rectification circuit rectifying device is few, and the efficient height is in the extensive use of having arrived of these occasions.
The double reverse-stars type rectification circuit is divided into double reverse-stars type diode rectifier circuit and double reverse-stars type scr rectification circuit two classes.Its output dc voltage of double reverse-stars type diode rectifier circuit becomes fixed proportion with AC-input voltage, and output dc voltage changed thereupon when input voltage changed, and can not guarantee that output dc voltage is stable, therefore is applied to the occasion not high to voltage request.The double reverse-stars type scr rectification circuit when electrical network and load variations, can guarantee that by the control to thyristor output dc voltage is constant, has therefore obtained extensive use in the low-voltage, high-current occasion.The double reverse-stars type scr rectification circuit is owing to self is non-linear, can produce a large amount of harmonic waves, and along with the increase of pilot angle it non-linearly also can increase, can produce more harmonic wave, electrical network is produced serious harmonic pollution, cause the line voltage distortion, reduce the system power factor, therefore the harmonic wave that produces in effective inhibition double reverse-stars type scr rectification circuit course of work is significant.
The main method that solves the pollution problem of high-power double reverse-stars type thyristor rectifier system harmonics in the prior art is to compensate the harmonic wave that commutation system produces by installing harmonic compensation device, this method does not change the non-linear of former double reverse-stars type thyristor rectifier system, be to compensate after harmonic wave produces, harmonic wave produces the influence of system.Power grade and double reverse-stars type thyristor rectifier system at a lot of occasion harmonic compensation devices are more or less the same, and so both can increase capacity and the volume of whole system, also can increase system loss and cost.Solve the harmonic pollution problem more reasonable method should be not cause under the prerequisite of big increase at capacity and volume to original thyristor rectifier system, by the transformation to double reverse-stars type thyristor rectifier system, solve the non-linear of two anti-controlled rectification system, make system not produce harmonic wave, harmonic carcellation is to the influence of system.
Summary of the invention
In order to solve the non-linear of existing double reverse-stars type thyristor rectifier system, can make its problem that produces a large amount of harmonic waves, the DC side harmonic wave that has proposed double reverse-stars type thyristor rectifier system suppresses System and method for.
The DC side harmonic wave inhibition system of double reverse-stars type thyristor rectifier system comprises interphase reactor, frequency tripling electric current triangular wave inverter circuit, drive circuit, signal processing and the control circuit of being with secondary, interphase reactor secondary current transducer, reaches phase-control circuit and load circuit current sensor synchronously
Primary coil with the paralleing reactor of secondary is connected in parallel between two groups of three-phase semiwave controllable rectifier bridge positive polarity output terminals of existing double reverse-stars type scr rectification circuit, the positive polarity output terminal that connects load with the centre tap of the primary coil of the paralleing reactor of secondary, be connected in parallel on the interchange input side of frequency tripling electric current triangular wave inverter circuit with the secondary coil of the paralleing reactor of secondary, the DC side of frequency tripling electric current triangular wave inverter circuit is in parallel with positive polarity output terminal and the negative polarity output of load power source
The first input end that reaches phase-control circuit synchronously links to each other with a phase phase voltage of electrical network, reaching phase-control circuit second input synchronously links to each other with the neutral line of electrical network, the output that reaches phase-control circuit synchronously connects the synchronizing datum signal input of signal processing and control circuit
The load circuit current sensor is for detection of the electric current between the centre tap of the primary coil of the interphase reactor of the positive polarity output terminal of load and band secondary, the current signal output end of load circuit current sensor connects the load circuit current signal input of signal processing and control circuit
Interphase reactor secondary current transducer is for detection of the electric current of the secondary coil of the interphase reactor of band secondary, and the current signal output end of interphase reactor secondary current transducer connects the reactor secondary current signal input part of signal processing and control circuit,
The control signal output of signal processing and control circuit connects the control signal input of drive circuit, and the driving signal output part of drive circuit connects the driving signal input of frequency tripling electric current triangular wave inverter circuit.
adopt the DC side harmonics inhibition system of double reverse-stars type thyristor rectifier system to realize that the method that harmonic wave suppresses is: load to be connected between the negative polarity output of load power source of the positive polarity output terminal of load power source of double reverse-stars type thyristor rectifier system and double reverse-stars type thyristor rectifier system, synchronous and phase-control circuit gathers a phase phase voltage signal of two anti-star transformer alternating inputs, size according to the system output dc voltage, generate the benchmark triangular signal after filtering and phase controlling, this benchmark triangular signal is input in signal processing and control circuit,
Signal handle and control circuit with the benchmark triangular signal that receives and the detected load circuit current signal of the load circuit current sensor generation current reference signal that multiplies each other, the secondary current signal of the interphase reactor of this current reference signal and detected band secondary relatively after, after the controller of signal processing and control circuit is handled, produce two-way and exist the PWM in dead band to drive signal, and this PWM driving signal is sent to drive circuit;
Drive circuit drives signal with the PWM that receives to carry out exporting to frequency tripling electric current triangular wave inverter circuit after the power amplification, the secondary current value of adjustment reactor, making the secondary current peak value of the interphase reactor of band secondary by current closed-loop control is 0.5 times of described load circuit current value, and first negative peak point of the secondary current of each power frequency period inner equilibrium reactor lags behind and exchanges input phase voltage α, wherein α is the triggering angle that requires determined thyristor according to output dc voltage, can realize exchanging the inhibition of side Harmonics of Input.
The present invention has realized suppressing to exchange the side Harmonics of Input in the DC side of double reverse-stars type thyristor rectifier system, by the control of secondary current to the interphase reactor of band secondary, secondary at the interphase reactor of being with secondary obtains a frequency, phase place, the low capacity current source that amplitude is all satisfied the demand, utilize the relation of alternating current-direct current side current harmonics, influence the input current that exchanges side, to exchange the side Harmonics of Input and suppress in DC side, realize that double reverse-stars type thyristor rectifier system all can realize the inhibition to Harmonics of Input in the Adjustable Output Voltage scope.
Existing double reverse-stars type thyristor rectifier system exchanges side Harmonics of Input content height, the THD of input current is not less than 30%, after described harmonic wave inhibition system being connected in the DC side of original double reverse-stars type thyristor rectifier system, can realize that pilot angle α all can significantly suppress Harmonics of Input in 0 to 90 degree scope, make the THD of input current less than 3%, can equivalence be the linear resistance sense load of electrical network almost with the double reverse-stars type thyristor rectifier system of DC side harmonic wave inhibition system this moment.The present invention compares with the existing mode that adopts active filter to carry out harmonic compensation, and power system capacity only increases about 8%, has solved rectification circuit and has exchanged problems such as side harmonic wave inhibition power system capacity is big, the harmonic wave secondary pollution is serious.
It is zero double reverse-stars type thyristor rectifier system that double reverse-stars type diode rectification system is equivalent to pilot angle α, is particular job point of double reverse-stars type thyristor rectifier system.
Description of drawings
Fig. 1 is the structural representation that the DC side harmonic wave of the described double reverse-stars type thyristor rectifier of embodiment one system suppresses circuit system;
Fig. 2 is the frequency tripling electric current triangular wave inverter circuit structure chart of execution mode two described employing half-bridge structures;
Fig. 3 is the frequency tripling electric current triangular wave inverter circuit structure chart of execution mode two described employing full bridge structures;
Fig. 4 is the unipolarity course of work curve chart of execution mode three described DC side harmonic suppressing methods;
Fig. 5 is the bipolarity course of work curve chart of execution mode three described DC side harmonic suppressing methods;
Fig. 6 to 9 for the frequency tripling electric current triangular wave inverter circuit that adopts full bridge structure under the unipolarity operating state, the current circuit schematic diagram corresponding with four periods in the course of work curve chart shown in Figure 4, wherein:
Fig. 6 represents
To t
1The current circuit schematic diagram of section;
Fig. 7 represents t
1To t
2The current circuit schematic diagram of section;
Fig. 8 represents t
2To t
3The current circuit schematic diagram of section;
Fig. 9 represents t
3To t
4The current circuit schematic diagram of section;
Figure 10 to 13 for the frequency tripling electric current triangular wave inverter circuit that adopts full bridge structure under the bipolarity operating state, the current circuit schematic diagram corresponding with four periods in the course of work curve chart shown in Figure 5, wherein:
Figure 10 represents
To t
1The current circuit schematic diagram of section;
Figure 11 represents t
1To t
2The current circuit schematic diagram of section;
Figure 12 represents
To t
3The current circuit schematic diagram of section;
Figure 13 represents t
3To t
4The current circuit schematic diagram of section;
Figure 14 is the embodiment seven described structural representations that reach phase-control circuit synchronously.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1, the DC side harmonic wave inhibition system of the described double reverse-stars type thyristor rectifier of present embodiment system comprises the interphase reactor 1 of being with secondary, frequency tripling electric current triangular wave inverter circuit 2, drive circuit 3, signal handles and control circuit 4, interphase reactor secondary current transducer 5, reach phase-control circuit 6 and load circuit current sensor 7 synchronously
Primary coil with the paralleing reactor 1 of secondary is connected in parallel between existing double reverse-stars type scr rectification circuit two groups of three-phase semiwave controllable rectifier bridge positive polarity output terminal R, Q, the positive polarity output terminal P that connects load with the centre tap of the primary coil of the paralleing reactor 1 of secondary, be connected in parallel on the interchange input side of frequency tripling electric current triangular wave inverter circuit 2 with the secondary coil of the paralleing reactor 1 of secondary, the DC side of frequency tripling electric current triangular wave inverter circuit 2 is in parallel with positive polarity output terminal P and the negative polarity output M of load power source
The first input end that reaches phase-control circuit 6 synchronously links to each other with a phase phase voltage of electrical network, reaching phase-control circuit 6 second inputs synchronously links to each other with the neutral line of electrical network, the output that reaches phase-control circuit 6 synchronously connects the synchronizing datum signal input of signal processing and control circuit 4
Load circuit current sensor 7 is for detection of the electric current between the centre tap of the primary coil of the interphase reactor 1 of the positive polarity output terminal P of load and band secondary, the current signal output end of load circuit current sensor 7 connects the load circuit current signal input of signal processing and control circuit 4
Interphase reactor secondary current transducer 5 is for detection of the electric current of the secondary coil of the interphase reactor 1 of band secondary, the current signal output end of interphase reactor secondary current transducer 5 connects the reactor secondary current signal input part of signal processing and control circuit 4
The control signal output of signal processing and control circuit 4 connects the control signal input of drive circuit 3, and the driving signal output part of drive circuit 3 connects the driving signal input of frequency tripling electric current triangular wave inverter circuit 2.
The interphase reactor that present embodiment will have double reverse-stars type thyristor rectifier system DC side now replaces with the interphase reactor of being with secondary, be connected to electrical network by the double reverse-stars type transformer, the output of double reverse-stars type transformer connects two three-phase semiwave controlled rectification bridges, former limit one end of the interphase reactor 1 of band secondary connects the positive polarity output terminal R of a three-phase semiwave controlled rectification of double reverse-stars type scr rectification circuit bridge, the former limit other end of the interphase reactor 1 of band secondary connects the positive polarity output terminal Q of another three-phase semiwave controlled rectification bridge of double reverse-stars type scr rectification circuit, and load 8 is connected between the negative polarity output M of load power source of the positive polarity output terminal P of load power source and double reverse-stars type thyristor rectifier system.
Embodiment two: present embodiment is the DC side harmonic wave of the described double reverse-stars type thyristor rectifier of embodiment one system to be suppressed the further restriction of system, and described frequency tripling electric current triangular wave inverter circuit 2 adopts half-bridge or full bridge structures.
Embodiment three: present embodiment is the DC side harmonic wave of the described double reverse-stars type thyristor rectifier of embodiment one system to be suppressed the further restriction of system, when described frequency tripling electric current triangular wave inverter circuit 2 adopted full bridge structure, signal was handled and control circuit 4 adopts unipolarity or ambipolar PWM control mode.
Embodiment four: present embodiment is described referring to Fig. 2, present embodiment is the DC side harmonic wave of the described double reverse-stars type thyristor rectifier of embodiment one system to be suppressed the further restriction of system, described frequency tripling electric current triangular wave inverter circuit 2 is half-bridge structure, and circuit is by first inductance L
1N, the one one switching tube S
11, the one one diode D
11, the one one capacitor C
11, the one one resistance R
11, the one or three switching tube S
13, the one or three diode D
13, the one or three capacitor C
13, the one or three resistance R
13, the one or two capacitor C
12, the one or two resistance R
12, the one or four capacitor C
14With the one or four resistance R
14Form the first inductance l
1NAn end link to each other first inductance L with the end of secondary coil of the interphase reactor 1 of band secondary
1NThe other end simultaneously and the one one diode D
11Anode, the one one switching tube S
11One end, the one one resistance R
11An end, the one or three switching tube S
13An end, the one or three diode D
13Negative electrode, the one or three capacitor C
13An end link to each other the one one switching tube S
11The other end simultaneously and the one one diode D
11Negative electrode, the one one capacitor C
11An end, the one or two capacitor C
12An end, the one or two resistance R
12An end and the positive polarity output terminal P of load power source link to each other the one one resistance R
11The other end and the one one capacitor C
11The other end link to each other, the negative polarity output M of load is simultaneously and the one or four resistance R
14An end, the one or four capacitor C
14An end, the one or three resistance R
13An end, the one or three diode D
13Anode and the one or three switching tube S
13The other end link to each other the one or four resistance R
14The other end simultaneously and the one or two resistance R
12The other end, the one or four capacitor C
14The other end, the one or two capacitor C
12The other end and the other end of secondary coil of the interphase reactor 1 of band secondary link to each other the one or three capacitor C
13The other end and the one or three resistance R
13The other end link to each other.
Embodiment five: present embodiment is described referring to Fig. 3, present embodiment is the DC side harmonic wave of the described double reverse-stars type thyristor rectifier of embodiment one system to be suppressed the further restriction of system, described frequency tripling electric current triangular wave inverter circuit circuit 2 is full bridge structure, and described full-bridge controlled rectification circuit is by second inductance L
2N, the 21 switching tube S
21, the 21 diode D
21, the 21 capacitor C
21, the 21 resistance R
21, the two or three switching tube S
23, the two or three diode D
23, the two or three capacitor C
23, the two or three resistance R
23, the two or two switching tube S
22, the two or two diode D
22, the two or two capacitor C
22, the two or two resistance R
22, the two or four switching tube S
24, the two or four diode D
24, the two or four capacitor C
24With the two or four resistance R
24Form,
Second inductance L
2NAn end link to each other second inductance L with the end of secondary coil of the interphase reactor 1 of band secondary
2NThe other end simultaneously and the 21 switching tube S
21An end, the 21 diode D
21Anode, the 21 resistance R
21An end, the two or three switching tube S
23An end, the two or three diode D
23Negative electrode and the two or three capacitor C
23An end link to each other the 21 switching tube S
21The other end simultaneously and the 21 diode D
21Negative electrode, the 21 capacitor C
21An end, the two or two switching tube S
22An end, the two or two diode D
22Negative electrode, the two or two capacitor C
22An end and the positive polarity output terminal P of load power source link to each other the 21 capacitor C
21The other end and the 21 resistance R
21The other end link to each other the two or two capacitor C
22The other end and the two or two resistance R
22An end link to each other the two or two resistance R
22The other end simultaneously and the two or two switching tube S
22The other end, the two or two diode D
22The other end, the two or the four switching tube S of secondary coil of interphase reactor 1 of anode, band secondary
24An end, the two or four diode D
24Negative electrode, the two or four capacitor C
24An end link to each other the two or four capacitor C
24The other end and the two or four resistance R
24An end link to each other the two or four resistance R
24The other end simultaneously and the two or four switching tube S
24The other end, the two or four diode D
24Anode, negative polarity output M, the two or the three switching tube S of load power source
23The other end, the two or three diode D
23Anode, the two or three resistance R
23An end link to each other the two or three resistance R
23The other end and the two or three capacitor C
23The other end link to each other.
Embodiment six: present embodiment is the DC side harmonic wave of the described double reverse-stars type thyristor rectifier of embodiment one system to be suppressed the further restriction of system, and the switching tube of described frequency tripling electric current triangular wave inverter circuit 2 is selected MOSFET or IGBT for use.
Described MOSFET or IGBT carry body diode, and the every pair of diode in the frequency tripling electric current triangular wave inverter circuit of described employing full bridge structure and switching tube can be replaced by MOSFET or the IGBT of a belt body diode.
Embodiment seven: present embodiment is described referring to Figure 14, present embodiment is the DC side harmonic wave of the described double reverse-stars type thyristor rectifier of embodiment one system to be suppressed the further restriction of system, the described phase-control circuit 6 that reaches synchronously comprises synchrotrans 6-1, phase-control circuit 6-2 and phase lock circuitry 6-3, the first input end of synchrotrans 6-1 is synchronously and the first input end of phase-control circuit 6, second input of synchrotrans 6-1 is synchronously and second input of phase-control circuit 6, the output of synchrotrans 6-1 links to each other with the synchronous signal input end of phase-control circuit 6-2, the synchronous square-wave signal output of phase-control circuit 6-2 links to each other with the synchronous square-wave signal input of phase lock circuitry 6-3, and the output of phase lock circuitry 6-3 is synchronously and the output of phase-control circuit 6.
Embodiment eight: adopt the DC side harmonic wave inhibition system of the described double reverse-stars type thyristor rectifier of embodiment one system to realize that the method that harmonic wave suppresses is: load 8 is connected between the negative polarity output M of load power source of the positive polarity output terminal P of load power source of double reverse-stars type thyristor rectifier system and double reverse-stars type thyristor rectifier system, reach phase-control circuit 6 synchronously and gather a phase phase voltage signal of two anti-star transformer alternatings inputs, size according to system's output dc voltage, after filtering and phase control, generate the benchmark triangular signal, this benchmark triangular signal is input in signal processing and the control circuit 4
Signal handle and control circuit 4 with the benchmark triangular signal that receives and the load circuit current sensor 7 detected load circuit current signals generation current reference signal that multiplies each other, the secondary current signal of the interphase reactor 1 of this current reference signal and detected band secondary relatively after, after the controller of signal processing and control circuit 4 is handled, produce two-way and exist the PWM in dead band to drive signal, and this PWM driving signal is sent to drive circuit 3;
Drive circuit 3 drives signal with the PWM that receives to carry out exporting to frequency tripling electric current triangular wave inverter circuit 2 after the power amplification, the secondary current value of adjustment reactor 1, making the secondary current peak value of the interphase reactor 1 of band secondary by current closed-loop control is 0.5 times of described load circuit current value, and first negative peak point of the secondary current of each power frequency period inner equilibrium reactor lags behind and exchanges input phase voltage α, wherein α is the triggering angle that requires determined thyristor according to output dc voltage, can realize exchanging the inhibition of side Harmonics of Input.
Embodiment nine: present embodiment is described referring to Fig. 4, Fig. 6, Fig. 7, Fig. 8 and Fig. 9, present embodiment is the further restriction to embodiment eight described harmonic suppressing methods, frequency tripling electric current triangular wave inverter circuit adopts full bridge structure, signal is handled and control circuit 4 adopts the unipolarity control method, secondary current by control interphase reactor 1, make first negative peak point of this electric current lag behind two anti-star transformer alternating input phase voltage α at each power frequency period, the course of work of this frequency tripling electric current triangular wave inverter circuit 2 is:
When adopting the unipolarity control method, frequency tripling electric current triangular wave inverter circuit has four kinds of mode of operations in half period, below from
Constantly begin, four kinds of mode of operations of positive half period are followed successively by:
t
1To t
2Section: at t
1Constantly, open the two or two switching tube S
22, this moment the two or three switching tube S
23With the two or two switching tube S
22Conducting together, the secondary voltage u of the interphase reactor of band secondary
sBe added in second inductance L together with the voltage in the load
2NOn, second inductance L
2NCurrent i
sRise second inductance L rapidly
2NContinue storage power, this moment, the alternating current-direct current side was all exported energy to second inductive energy storage,
t
2To t
3Section: at t
2Constantly, turn-off the two or three switching tube S
23, the 21 diode D
21Afterflow, the two or two switching tube S at this moment
22With the 21 diode D
21Conducting together, the secondary voltage u of the interphase reactor of band secondary
sBe added in second inductance L
2NOn, second inductance L
2NCurrent i
sContinue to rise second inductance L
2NContinue storage power, this moment, the alternating current-direct current side did not have the exchange of energy,
t
3To t
4Section: at t
3Constantly, turn-off the two or two switching tube S
22, the 242 closes pipe D
24Pipe D is closed in conducting this moment the 242
24With the 212 pass pipe D
21Conducting together, the secondary voltage u of the interphase reactor of band secondary
sPower to the load second inductance L with inductance
1NCurrent i
sBegin to descend second inductance L
1NContinue storage power, the energy that exchange side and inductance this moment passes to load.
Present embodiment is that the mode of operation during to the control of frequency tripling electric current triangular wave inverter circuit 2 unipolarities of full bridge structure is introduced, this circuit is when the positive half cycle of input current and negative half period, the circuit working principle is identical, operating state is symmetrical, and the mode of operation when therefore only input current being positive half cycle is described.
Embodiment ten: present embodiment is described referring to Fig. 5, Figure 10, Figure 11, Figure 12 and Figure 13, present embodiment is the further restriction to embodiment eight described harmonic suppressing methods, frequency tripling electric current triangular wave inverter circuit adopts full bridge structure, signal is handled and control circuit 4 adopts ambipolar control method, secondary current by control interphase reactor 1, make first negative peak point of this electric current lag behind two anti-star transformer alternating input phase voltage α at each power frequency period, the course of work of this frequency tripling electric current triangular wave inverter circuit 2 is:
When adopting ambipolar control method, frequency tripling electric current triangular wave inverter circuit has four kinds of mode of operations in one-period, negative half-cycle from
Constantly begin, 2 kinds of mode of operations of negative half-cycle are followed successively by:
t
1To t
2Section: at t
1Constantly, turn-off the 21 switching tube S
21With the two or four switching tube S
24Switching tube, second inductance L
2NCurrent i
sThrough the two or two diode D
22With the two or three diode D
23Afterflow, second inductance L
2NCurrent i
sLinear decline, second inductance L at this moment
2NSecondary voltage u with the interphase reactor of being with secondary
sPower to the load together,
Positive half period from
Constantly begin, 2 kinds of mode of operations of positive half period are followed successively by:
t
3To t
4Section: at t
3Constantly, turn-off the two or three switching tube S
23With the two or two switching tube S
22Switching tube, second inductance L
2NCurrent i
sThrough the 21 diode D
21With the two or four diode D
24Afterflow, second inductance L
2NCurrent i
sLinear decline, second inductance L at this moment
2NSecondary voltage u with the interphase reactor of being with secondary
sPower to the load together.
Claims (10)
1. the DC side harmonic wave of double reverse-stars type thyristor rectifier system suppresses system, it is characterized in that, comprise the interphase reactor (1) of being with secondary, frequency tripling electric current triangular wave inverter circuit (2), drive circuit (3), signal handles and control circuit (4), interphase reactor secondary current transducer (5), reach phase-control circuit (6) and load circuit current sensor (7) synchronously
Primary coil with the paralleing reactor (1) of secondary is connected in parallel between two groups of three-phase semiwave controllable rectifier bridge positive polarity output terminals of existing double reverse-stars type scr rectification circuit (R, Q), the positive polarity output terminal (P) that connects load with the centre tap of the primary coil of the paralleing reactor (1) of secondary, be connected in parallel on the interchange input side of frequency tripling electric current triangular wave inverter circuit (2) with the secondary coil of the paralleing reactor (1) of secondary, the DC side of frequency tripling electric current triangular wave inverter circuit (2) is in parallel with positive polarity output terminal (P) and the negative polarity output (M) of load power source
The first input end that reaches phase-control circuit (6) synchronously links to each other with a phase phase voltage of electrical network, reaching phase-control circuit (6) second inputs synchronously links to each other with the neutral line of electrical network, the output that reaches phase-control circuit (6) synchronously connects the synchronizing datum signal input of signal processing and control circuit (4)
Load circuit current sensor (7) is for detection of the electric current between the centre tap of the primary coil of the interphase reactor (1) of the positive polarity output terminal (P) of load and band secondary, the current signal output end of load circuit current sensor (7) connects the load circuit current signal input of signal processing and control circuit (4)
Interphase reactor secondary current transducer (5) is for detection of the electric current of the secondary coil of the interphase reactor (1) of band secondary, the current signal output end of interphase reactor secondary current transducer (5) connects the reactor secondary current signal input part of signal processing and control circuit (4)
The control signal output of signal processing and control circuit (4) connects the control signal input of drive circuit (3), and the driving signal output part of drive circuit (3) connects the driving signal input of frequency tripling electric current triangular wave inverter circuit (2).
2. the DC side harmonic wave of double reverse-stars type thyristor rectifier according to claim 1 system suppresses system, it is characterized in that, described frequency tripling electric current triangular wave inverter circuit (2) adopts half-bridge or full bridge structure.
3. the DC side harmonic wave of double reverse-stars type thyristor rectifier according to claim 1 system suppresses system, it is characterized in that, when described frequency tripling electric current triangular wave inverter circuit (2) adopted full bridge structure, signal was handled and control circuit (4) adopts unipolarity or ambipolar PWM control mode.
4. the DC side harmonic wave of double reverse-stars type thyristor rectifier according to claim 1 system suppresses system, it is characterized in that described frequency tripling electric current triangular wave inverter circuit (2) is half-bridge structure, and circuit is by the first inductance (L
1N), the one one switching tube (S
11), the one one diode (D
11), the one one electric capacity (C
11), the one one resistance (R
11), the one or three switching tube (S
13), the one or three diode (D
13), the one or three electric capacity (C
13), the one or three resistance (R
13), the one or two electric capacity (C
12), the one or two resistance (R
12), the one or four electric capacity (C
14) and the one or four resistance (R
14) form the first inductance (L
1N) an end link to each other the first inductance (L with the end of secondary coil of the interphase reactor (1) of band secondary
1N) the other end simultaneously and the one one diode (D
11) anode, the one one switching tube (S
11) end, the one one resistance (R
11) an end, the one or three switching tube (S
13) an end, the one or three diode (D
13) negative electrode, the one or three electric capacity (C
13) an end link to each other the one one switching tube (S
11) the other end simultaneously and the one one diode (D
11) negative electrode, the one one electric capacity (C
11) an end, the one or two electric capacity (C
12) an end, the one or two resistance (R
12) an end and the positive polarity output terminal (P) of load power source link to each other the one one resistance (R
11) the other end and the one one electric capacity (C
11) the other end link to each other, the negative polarity output (M) of load is simultaneously and the one or four resistance (R
14An end, the one or four electric capacity (C
14An end, the one or three resistance (R
13) an end, the one or three diode (D
13) anode and the one or three switching tube (S
13) the other end link to each other the one or four resistance (R
14) the other end simultaneously and the one or two resistance (R
12) the other end, the one or four electric capacity (C
14) the other end, the one or two electric capacity (C
12) the other end and the other end of secondary coil of the interphase reactor (1) of band secondary link to each other the one or three electric capacity (C
13) the other end and the one or three resistance (R
13) the other end link to each other.
5. the DC side harmonic wave of double reverse-stars type thyristor rectifier according to claim 1 system suppresses system, it is characterized in that described frequency tripling electric current triangular wave inverter circuit (2) is full bridge structure, and described full-bridge controlled rectification circuit is by the second inductance (L
2N), the 21 switching tube (S
21), the 21 diode (D
21), the 21 electric capacity (C
21), the 21 resistance (R
21), the two or three switching tube (S
23), the two or three diode (D
23), the two or three electric capacity (C
23), the two or three resistance (r
23), the two or two switching tube (S
22), the two or two diode (D
22), the two or two electric capacity (C
22), the two or two resistance (R
22), the two or four switching tube (S
24), the two or four diode (D
24), the two or four electric capacity (C
24) and the two or four resistance (R
24) form,
Second inductance (the L
2N) an end link to each other the second inductance (L with the end of secondary coil of the interphase reactor (1) of band secondary
2N) the other end simultaneously and the 21 switching tube (S
21) an end, the 21 diode (D
21) anode, the 21 resistance (R
21) an end, the two or three switching tube (S
23) an end, the two or three diode (D
23) negative electrode and the two or three electric capacity (C
23) an end link to each other the 21 switching tube (S
21) the other end simultaneously and the 21 diode (D
21) negative electrode, the 21 electric capacity (C
21) an end, the two or two switching tube (S
22) an end, the two or two diode (D
22) negative electrode, the two or two electric capacity (C
22) an end and the positive polarity output terminal (P) of load power source link to each other the 21 electric capacity (C
21) the other end and the 21 resistance (R
21) the other end link to each other the two or two electric capacity (C
22) the other end and the two or two resistance (R
22) an end link to each other the two or two resistance (R
22) the other end simultaneously and the two or two switching tube (S
22) the other end, the two or two diode (D
22) the other end, the two or the four switching tube (S of secondary coil of interphase reactor (1) of anode, band secondary
24) an end, the two or four diode (D
24) negative electrode, the two or four electric capacity (C
24) an end link to each other the two or four electric capacity (C
24) the other end and the two or four resistance (R
24) an end link to each other the two or four resistance (R
24) the other end simultaneously and the two or four switching tube (S
24) the other end, the two or four diode (D
24) anode, the negative polarity output (M) of load power source, the two or three switching tube (S
23) the other end, the two or three diode (D
23) anode, the two or three resistance (R
23) an end link to each other the two or three resistance (R
23) the other end and the two or three electric capacity (C
23) the other end link to each other.
6. the DC side harmonic wave of double reverse-stars type thyristor rectifier according to claim 1 system suppresses system, it is characterized in that the switching tube of described frequency tripling electric current triangular wave inverter circuit (2) is selected MOSFET or IGBT for use.
7. the DC side harmonic wave of double reverse-stars type thyristor rectifier according to claim 1 system suppresses system, it is characterized in that, the described phase-control circuit (6) that reaches synchronously comprises synchrotrans (6-1), phase-control circuit (6-2) and phase lock circuitry (6-3), the first input end of synchrotrans (6-1) is synchronously and the first input end of phase-control circuit (6), second input of synchrotrans (6-1) is synchronously and second input of phase-control circuit (6), the output of synchrotrans (6-1) links to each other with the synchronous signal input end of phase-control circuit (6-2), the synchronous square-wave signal output of phase-control circuit (6-2) links to each other with the synchronous square-wave signal input of phase lock circuitry (6-3), and the output of phase lock circuitry (6-3) is synchronously and the output of phase-control circuit (6).
8. adopt the DC side harmonic wave inhibition system of the described double reverse-stars type thyristor rectifier of claim 1 system to realize that the method that harmonic wave suppresses is:
Load 8 is connected between the negative polarity output (M) of load power source of the positive polarity output terminal (P) of load power source of double reverse-stars type thyristor rectifier system and double reverse-stars type thyristor rectifier system, reach phase-control circuit (6) synchronously and gather a phase phase voltage signal of two anti-star transformer alternatings inputs, size according to system's output dc voltage, after filtering and phase control, generate the benchmark triangular signal, this benchmark triangular signal is input in signal processing and the control circuit (4)
Signal handle and control circuit (4) with the benchmark triangular signal that receives and the detected load circuit current signal of load circuit current sensor (7) the generation current reference signal that multiplies each other, the secondary current signal of the interphase reactor of this current reference signal and detected band secondary (1) relatively after, after the controller of signal processing and control circuit (4) is handled, produce two-way and exist the PWM in dead band to drive signal, and this PWM driving signal is sent to drive circuit (3);
Drive circuit (3) drives signal with the PWM that receives to carry out exporting to frequency tripling electric current triangular wave inverter circuit (2) after the power amplification, the secondary current value of the interphase reactor of accommodation zone secondary (1), making the secondary current peak value of the interphase reactor (1) of band secondary by current closed-loop control is 0.5 times of described load circuit current value, and first negative peak point of the secondary current of each power frequency period inner equilibrium reactor lags behind and exchanges input phase voltage α, wherein α is the triggering angle that requires determined thyristor according to output dc voltage, can realize exchanging the inhibition of side Harmonics of Input.
9. harmonic suppressing method according to claim 8, it is characterized in that, frequency tripling electric current triangular wave inverter circuit adopts full bridge structure, signal is handled and control circuit (4) adopts the unipolarity control method, be with the secondary current of the interphase reactor (1) of secondary by control, make first negative peak point of this electric current lag behind two anti-star transformer alternating input phase voltage α at each power frequency period, the course of work of this frequency tripling electric current triangular wave inverter circuit (2) is:
When adopting the unipolarity control method, frequency tripling electric current triangular wave inverter circuit has four kinds of mode of operations in half period, below from
Constantly begin, four kinds of mode of operations of positive half period are followed successively by:
To t
1Section:
Constantly, open the two or three switching tube (S
23), the two or three switching tube (S
23) and the two or four diode (D
24) conducting together, the secondary voltage u of the interphase reactor of band secondary
sBe added in the second inductance (L
2N) on, the second inductance (L
2N) current i
sForward flow, and the rising of starting from scratch, the second inductance (L
2N) storage power, this moment, the alternating current-direct current side did not have the exchange of energy,
t
1To t
2Section: at t
1Constantly, open the two or two switching tube (S
22), this moment the two or three switching tube (S
23) and the two or two switching tube (S
22) conducting together, the secondary voltage u of the interphase reactor of band secondary
sBe added in the second inductance (L together with the voltage in the load
2N) on, the second inductance (L
2N) current i
sRise the second inductance (L rapidly
2N) continue storage power, this moment, the alternating current-direct current side was all exported energy to second inductive energy storage,
t
2To t
3Section: at t
2Constantly, turn-off the two or three switching tube (S
23), the 21 diode (D
21) afterflow, the two or two switching tube (S at this moment
22) and the 21 diode (D
21) conducting together, the secondary voltage u of the interphase reactor of band secondary
sBe added in the second inductance (L
2N) on, the second inductance (L
2N) current i
sContinue to rise the second inductance (L
2N) continue storage power, this moment, the alternating current-direct current side did not have the exchange of energy,
t
3To t
4Section: at t
3Constantly, turn-off the two or two switching tube (S
22), the 242 closes pipe (D
24) conducting, close pipe (D this moment the 242
24) and the 212 pass pipe (D
21) conducting together, the secondary voltage u of the interphase reactor of band secondary
sPower to the load the second inductance (L with inductance
1N) current i
sBegin to descend the second inductance (L
1N) continuing storage power, the energy that exchange side and inductance this moment passes to load.
10. harmonic suppressing method according to claim 8, it is characterized in that, frequency tripling electric current triangular wave inverter circuit adopts full bridge structure, signal is handled and control circuit (4) adopts ambipolar control method, be with the secondary current of the interphase reactor (1) of secondary by control, make first negative peak point of this electric current lag behind two anti-star transformer alternating input phase voltage α at each power frequency period, the course of work of this frequency tripling electric current triangular wave inverter circuit (2) is:
When adopting ambipolar control method, frequency tripling electric current triangular wave inverter circuit has four kinds of mode of operations in one-period, negative half-cycle from
Constantly begin, 2 kinds of mode of operations of negative half-cycle are followed successively by:
To t
1Section: in 0 moment, open the 21 switching tube (S
21) and the two or four switching tube (S
24), the secondary voltage u of the interphase reactor of band secondary
sBe added in the second inductance (L together with the voltage in the load
2N) on, the second inductance (L
2N) current i
sOppositely increase, at this moment the second inductance (L
2N) storage power,
t
1To t
2Section: at t
1Constantly, turn-off the 21 switching tube (S
21) and the two or four switching tube (S
24) switching tube, the second inductance (L
2N) current i
sThrough the two or two diode (D
22) and the two or three diode (D
23) afterflow, second inductance L
2NCurrent i
sLinear decline, the second inductance (L at this moment
2N) and the secondary voltage u of interphase reactor of band secondary
sPower to the load together,
Positive half period from
Constantly begin, 2 kinds of mode of operations of positive half period are followed successively by:
t
3To t
4Section: at t
3Constantly, turn-off the two or three switching tube (S
23) and the two or two switching tube (S
22) switching tube, the second inductance (L
2N) current i
sThrough the 21 diode D
21With the two or four diode (D
24) afterflow, the second inductance (L
2N) current i
sLinear decline, the second inductance (L at this moment
2N) and the secondary voltage u of interphase reactor of band secondary
sPower to the load together.
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