CN103051239A - Cascade multiple inverter device - Google Patents
Cascade multiple inverter device Download PDFInfo
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- CN103051239A CN103051239A CN2012103856414A CN201210385641A CN103051239A CN 103051239 A CN103051239 A CN 103051239A CN 2012103856414 A CN2012103856414 A CN 2012103856414A CN 201210385641 A CN201210385641 A CN 201210385641A CN 103051239 A CN103051239 A CN 103051239A
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Abstract
The invention relates to a cascade multiple inverter device capable of shortening data transmission time between a detection part detecting systematic voltage and controlling and capable of modifying delay time and phase difference. Rectifying parts (2) of single-phase inverter units (1) realize 120-degree circulation control. The cascade multiple inverter device includes a main control device (5) and an auxiliary control device (8). The main control device is provided with a systematic voltage detecting part (6) connected with AC input terminals of the rectifying part of the single-phase inverter units and a systematic voltage phase synchronous judging part (7) and generates synchronous signal that is synchronous with systematic voltage. The auxiliary control device transmits the synchronous signals generated by the main control device and generate 120-degree circulation width signal that is synchronous with the systematic voltage according to the transmitted synchronous signal for controlling the switching of the rectifying part of the single-phase inverter units.
Description
Technical field
The present invention relates to be connected in series the series multiplex DC-to-AC converter (serial multiple inverter device) of a plurality of single-phase inverters unit, relate in particular to the series multiplex DC-to-AC converter of energy Regeneration control.
Background technology
Generally, in the situation that directly accept the high-tension electricity control alternating current machines such as 3.3kV, 6.6kV, 10kV, use the series multiplex DC-to-AC converter.The prior art example of this series multiplex DC-to-AC converter does not import centered by the field as necessity without rapid variation, regeneration function by fan or pump even load.But in recent years, the expectation according to the purposes expansion of high-voltage motor etc. requires the additional regeneration function of series multiplex DC-to-AC converter.
In order to respond this requirement, proposed so that the output voltage phase place of the system voltage phase place of Regeneration control and inverter obtains synchronous series multiplex DC-to-AC converter shown in Figure 7 (for example, with reference to patent documentation 1).The series multiplex DC-to-AC converter of this patent documentation 1 record comprises the input transformer Tr that the three-phase transformer by multiple winding consists of, and carries out insulation and the step-down of system voltage with this input transformer Tr.U phase, V phase and W with this input transformer Tr step-down input respectively each the mutually single-phase inverter unit U1 ' of usefulness～U6 ', V1 '～V6 ' and W1 '～W6 ' mutually.
The U mutually single-phase inverter unit U1 ' of usefulness～U6 ' outlet side is connected in series.And an end of the outlet side of single-phase inverter unit U1 ' is by grounding through resistance, and the other end of the outlet side of single-phase inverter unit U6 ' is connected with the U phase motor winding of alternating current machine M.
Equally, V mutually the single-phase inverter unit V1 ' of usefulness～V6 ' outlet side be connected in series.And an end of the outlet side of single-phase inverter unit V1 ' is by grounding through resistance, and the other end of the outlet side of single-phase inverter unit V6 ' is connected with the V phase motor winding of alternating current machine M.
Have, the W mutually single-phase inverter unit W1 ' of usefulness～W6 ' outlet side is connected in series again.And an end of the outlet side of single-phase inverter unit W1 ' is by grounding through resistance, and the other end of the outlet side of single-phase inverter unit W6 ' is connected with the W phase motor winding of alternating current machine M.
The main circuit of each single-phase inverter unit U1 '～U6 ', V1 '～V6 ' and W1 '～W6 ' constitutes as shown in Figure 8.This main circuit structure comprises rectification part CV, the capacitor C that is connected with its outlet side, and the IV of inverse transformation section.
Rectification part (along transformation component) CV uses six IGBT as switch element, carries out 120 ° of flow quantity controls (circulation control).The system voltage that is input to this rectification part CV is detected by voltage detecting circuit 101, will transmit with the controller 102 of these voltage detecting circuit 101 detected system voltages to each single-phase inverter units shared.At controller 102, according to the magnitude of voltage of accepting, generate the signal that is used for implementation and the phase locked 120 ° of flow quantity controls of system voltage (conducting control), to the IGBT output of each rectification part CV.
Therefore, when alternating current machine M became reproduced state, the voltage that produces at alternating current machine M was by the diode of the IV of inverse transformation section, temporarily be transformed to direct current, and after capacitor C smoothing, be inversely transformed into three-phase alternating current by the IGBT of rectification part CV, regenerate at the alternating current source.
The situation of the main circuit structure of series multiplex DC-to-AC converter, all voltage detecting circuit 101 of single-phase inverter units shared is carried magnitude of voltage from this voltage detecting circuit to each single-phase inverter unit.
The prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2006-230027 communique
Summary of the invention
The problem that invention will solve
But, in the prior art example of above-mentioned patent documentation 1 record, will transmit with the controller of voltage detecting circuit 101 detected magnitudes of voltage to each single-phase inverter unit.Therefore, there is the factor data amount and elongated unresolved problem of delivery time.
In addition, magnitude of voltage is directly transmitted to the single-phase inverter unit, therefore, in order to generate and the phase locked signal of system voltage, controller in each single-phase inverter unit needs to revise " time of delay of voltage detecting circuit ", " the operating delay times of CPU etc. ", has the unresolved problem of the structure that becomes the function repetition.
And, for so that system voltage phase place and single-phase inverter units synchronization, need the information of its phase difference, or the information of input voltage phase, in the structure of patent documentation 1 record, existence can not realize synchronous unresolved problem.
Therefore, the present invention is conceived to the unresolved problem of above-mentioned prior art example, the object of the invention is to, data transfer time between the control part of rectification part of the test section that can shorten detection system voltage and control single-phase inverter unit is provided, can carries out that revise time of delay and the series multiplex DC-to-AC converter of phase difference correction.
Solve the technological means of problem
To achieve these goals, the first mode of the series multiplex DC-to-AC converter that the present invention relates to is following series multiplex DC-to-AC converter: the outlet side that is connected in series a plurality of single-phase inverters unit that comprises rectification part and inverse transformation section, at the input side of the rectification part of each single-phase inverter unit, by input transformer input AC electric power respectively.The rectification part of above-mentioned each single-phase inverter unit of this series multiplex DC-to-AC converter is carried out 120 ° of flow quantity controls, and above-mentioned series multiplex DC-to-AC converter comprises main control unit and sub controlling unit.Main control unit is provided with system voltage test section and the system voltage Phase synchronization detection unit that is connected with the interchange input side of the rectification part of above-mentioned each single-phase inverter unit, generates and the phase locked synchronizing signal of system voltage.Sub controlling unit is transmitted the above-mentioned synchronizing signal that is generated by this main control unit, according to the above-mentioned synchronizing signal that is transmitted, generates the 120 ° circulation width signal synchronous with system voltage, controls the switch motion of the rectification part of above-mentioned each single-phase inverter unit.
In addition, the second mode of the series multiplex DC-to-AC converter that the present invention relates to is following series multiplex DC-to-AC converter: the outlet side that is connected in series a plurality of single-phase inverters unit that comprises rectification part and inverse transformation section, at the input side of the rectification part of each single-phase inverter unit, by input transformer input AC electric power respectively.This series multiplex DC-to-AC converter comprises a main control unit and a plurality of sub controlling units of controlling respectively above-mentioned each single-phase inverter unit.Main control unit is provided with system voltage test section and the system voltage Phase synchronization detection unit of the system voltage of the system side that detects above-mentioned input transformer, generates and the phase locked synchronizing signal of system voltage.A plurality of auxiliary (slave) device is transfused to respectively from the above-mentioned synchronizing signal of main control unit output, generates the 120 ° circulation width signal synchronous with said system voltage, the switch motion of the rectification part of above-mentioned each the single-phase inverter unit of unit control.
In addition, the Third Way of the series multiplex DC-to-AC converter that the present invention relates to makes above-mentioned main control unit generate the synchronizing signal synchronous with said system voltage in the moment that comprises in advance system voltage and detect the time of delay of time of delay and operating delay time (moment before comprising the time of delay that system voltage detects time of delay and operating delay time), makes the output voltage Phase synchronization of said system voltage-phase and above-mentioned single-phase inverter unit.
In addition, the cubic formula of the series multiplex DC-to-AC converter that the present invention relates to makes above-mentioned main control unit exist in the situation of phase difference at the input voltage phase of system voltage phase place and above-mentioned single-phase inverter unit, transmit this phase information to above-mentioned sub controlling unit in advance, this sub controlling unit has generated for the above-mentioned synchronizing signal correction that transmits 120 ° of circulation width signal of above-mentioned phase difference.
The following describes effect of the present invention:
According to the present invention, main control unit is provided with system voltage test section and system voltage Phase synchronization detection unit, to be sent to by the synchronizing signal that system voltage Phase synchronization detection unit generates the sub controlling unit of the rectification part of single-phase inverter unit being carried out 120 ° of flow quantity controls, therefore, can consist of synchronizing signal with for example one (1 bit), can shorten the delivery time.
Like this, between main control unit and sub controlling unit, transmit synchronizing signal, therefore, can adjust the output opportunity (output regularly) of synchronizing signal, can carry out the adjustment of the operating delay time of time of delay of voltage detecting circuit and CPU etc., simultaneously, the phase difference of the input voltage phase of energy Adjustment System voltage-phase and single-phase inverter unit.
Description of drawings
Fig. 1 is the block diagram of the first execution mode of the series multiplex DC-to-AC converter that the present invention relates to of expression.
Fig. 2 is the time diagram for the action of explanation first embodiment of the invention.
Fig. 3 is the block diagram of expression second embodiment of the invention.
Fig. 4 is the block diagram of expression third embodiment of the invention.
Fig. 5 is the time diagram for the action of explanation third embodiment of the invention.
Fig. 6 is the time diagram for the action of explanation four embodiment of the invention.
Fig. 7 is the block diagram of expression series multiplex DC-to-AC converter of the prior art.
Fig. 8 is the circuit diagram of concrete formation of the single-phase inverter unit of presentation graphs 7.
Symbolic significance is as follows among the figure:
1-single-phase inverter unit
The 2-rectification part
The 3-capacitor
4-inverse transformation section
The 5-main control unit
6-system phase voltage detection department
7-system voltage Phase synchronization detection unit
The 8-sub controlling unit
9-360 ° of counter
SCu1～SCu3, SCv1～SCv3, SCw1～SCw(3)-sub controlling unit
11-synchronizing signal generating unit
Embodiment
Below, with reference to the description of drawings embodiment of the present invention, in the following embodiments, although to inscape, kind, combination, the position, shape, quantity, configuration waits and has done various restrictions relatively,, these only exemplify, and the present invention is not limited thereto.
Fig. 1 is that expression can be suitable for the single-phase inverter unit of the series multiplex DC-to-AC converter that the present invention relates to and the block diagram of control circuit thereof.
Among the figure, symbol 1 is the single-phase inverter unit.The single-phase inverter unit U1 ' of the above-mentioned Fig. 7 of this single-phase inverter unit 1 formation～U6 ', V1 '～V6 ' and W1 '～W6 ', it is suitable with Fig. 8.
Single-phase inverter unit 1 comprises the rectification part 2 that three-phase alternating current is transformed to direct current, so that from the capacitor 3 of the direct current power smoothing of this rectification part 2 outputs, and is connected in inverse transformation section 4 between these capacitor 3 two ends in parallel.
Rectification part 2 comprises six the thyristor Q1～Q6 that are made of for example IGBT that are connected between anodal side line Lp and the negative pole side line Ln.At this, thyristor Q1 and Q2 are connected in series between anodal side line Lp and the negative pole side line Ln, and the series circuit of the series circuit of thyristor Q3 and Q4 and thyristor Q5 and Q6 and thyristor Q1 and Q2 are connected in parallel between anodal side line Lp and the negative pole side line Ln.
In addition, inverse transformation section 4 comprises four the thyristor Q7～Q10 that are made of for example IGBT that are connected between anodal side line Lp and the negative pole side line Ln.At this, thyristor Q7 and Q8 are connected in series between anodal side line Lp and the negative pole side line Ln.In addition, thyristor Q9 and Q10 also are connected in series between anodal side line Lp and the negative pole side line Ln.And, the tie point of thyristor Q7 and Q8 is connected with the opposing party's of the single-phase inverter unit 1 of the side's side that is connected in series lead-out terminal, and the tie point of thyristor Q9 and Q10 is connected with a side's of the single-phase inverter unit 1 of the opposing party's side that is connected in series lead-out terminal.
And the U phase line Lu that is connected with the outlet side of input transformer is connected with the thyristor Q1 of rectification part 2 and the tie point between the Q2.In addition, the V phase line Lv that is connected with the outlet side of input transformer is connected with the tie point between thyristor Q3 and the Q4.Have, the W phase line Lw that is connected with the outlet side of input transformer is connected with the tie point between thyristor Q5 and the Q6 again.
In addition, U phase line Lu, the V phase line Lv between input transformer and the rectification part 2 and W phase line Lw are connected with main control unit 5.This main control unit 5 comprises the system voltage test section 6 of the system voltage Vw of the system voltage Vv of the system voltage Vu, the V phase line Lv that detect U phase line Lu and W phase line Lw, and according to the system voltage Phase synchronization detection unit 7 with this system voltage test section 6 detected each system voltage Vu, Vv, Vw generation synchronizing signal Sy.
At this, system voltage Phase synchronization detection unit 7 detect the system voltage Vu, the Vv that input, Vw from negative value be converted on the occasion of zero by point (zero cross point), detect zero during by point, with the synchronizing signal Sy of Rack (amplitude) to sub controlling unit 8 outputs.
This sub controlling unit 8 comprises 360 ° of counters 9, cause is from the rising of the synchronizing signal Sy of main control unit 5 inputs, these 360 ° of counters 9 reset to 0 °, sub controlling unit 8 is according to the count value of these 360 ° of counters 9, generates other signal of thyristor Q1～Q6 of the rectification part 2 of the 120 ° of above-mentioned single-phase inverter of flow quantity control unit 1.That is, sub controlling unit 8 forms the U phase signal of the grid that drives thyristor Q1, the count value of 360 ° of counters 9 in 30 °～150 ° interval (time), thyristor Q1 becomes conducting state.
That is, sub controlling unit 8 forms the V phase signal of the grid that drives thyristor Q3, the count value of 360 ° of counters 9 in 150 °～270 ° interval (time), thyristor Q3 becomes conducting state.In addition, sub controlling unit 8 forms the W phase signal of the grid that drives thyristor Q5, the count value of 360 ° of counters 9 in 270 °～30 ° interval (time), thyristor Q5 becomes conducting state.
Equally, sub controlling unit 8 forms the X phase signal of the grid that drives thyristor Q2, the count value of 360 ° of counters 9 in 210 °～330 ° interval (time), thyristor Q2 becomes conducting state.In addition, sub controlling unit 8 forms the Y phase signal of the grid that drives thyristor Q4, the count value of 360 ° of counters 9 in 330 °～90 ° interval (time), thyristor Q4 becomes conducting state.In addition, sub controlling unit 8 forms the Z phase signal of the grid that drives thyristor Q6, the count value of 360 ° of counters 9 in 90 °～210 ° interval (time), thyristor Q6 becomes conducting state.
And U phase, V phase and the W phase signal that generates at sub controlling unit 8 is supplied to thyristor Q1, the Q3 of rectification part 2 of single-phase inverter unit 1 and the grid of Q5.Equally, X phase, Y phase and the Z phase signal that generates at sub controlling unit 8 is supplied to thyristor Q2, the Q4 of rectification part 2 of single-phase inverter unit 1 and the grid of Q6.
Below, the action of above-mentioned execution mode is described with reference to time diagram shown in Figure 2.
Now, the U phase system voltage Vu that gets U phase line Lu is that example describes.
This U phase system voltage Vu shown in Fig. 2 (a), become between for example 0 °～180 ° on the occasion of, between 180 °～360 ° (0 °), be the sine wave signal of negative value.
Therefore, if detect U phase system voltage Vu at the system voltage test section 6 of main control unit 5, then this U phase system voltage Vu is supplied to system voltage Phase synchronization detection unit 7.Therefore, system voltage Phase synchronization detection unit 7 detect system voltage Vu from negative value be converted on the occasion of point, namely, zero passes through a little, shown in Fig. 2 (b), generate synchronizing signal Sy, it rises by point zero, after continuing shorter stipulated time conducting (ON) state, be returned to cut-off (OFF) state.
Then, the synchronizing signal Sy that generates at system voltage Phase synchronization detection unit 7 transmits to sub controlling unit 8.In this sub controlling unit 8, because of the rising of synchronizing signal Sy, 360 ° of counters 9 reset to 0 °, shown in Fig. 2 (c), since 0 ° of counting.Therefore, in sub controlling unit 8, according to the count value of 360 ° of counters 9, generate the U phase synchronous with U phase system voltage Vu shown in Fig. 2 (d)～(i)～Z phase signal.Then, the U phase, V phase and the W phase signal that generate are supplied with thyristor Q1, the Q3 of rectification part 2 of single-phase inverter unit 1 and the grid of Q5.In addition, the X phase, Y phase and the Z phase signal that generate are supplied with thyristor Q2, the Q4 of rectification part 2 of single-phase inverter unit 1 and the grid of Q6.Therefore, rectification part 2 is carried out the 120 ° flow quantity controls synchronous with U phase system voltage Vu, and three-phase ac power is transformed to direct current power.
Then, since from the direct current power of this rectification part 2 outputs after capacitor 3 smoothedization, supply with inverse transformation section 4, and the phase locked single phase alternating current (A.C.) of system voltage Vu outputs between the tie point of the tie point of the thyristor Q7 of inverse transformation section 4 and Q8 and thyristor Q9 and Q10.
Like this, rectification part 2 and the U phase system voltage Vu of single-phase inverter unit 1 carry out 120 ° of flow quantity controls synchronously, therefore, when motor M becomes reproduced state, the voltage that produces in motor M temporarily is transformed to direct current by the diode of inverse transformation section 4, and after capacitor 3 is smoothed, each thyristor Q1～Q6 by rectification part 2 is inversely transformed into three-phase alternating current, regenerates at the alternating current source.
Like this, if according to above-mentioned the first execution mode, system voltage test section 6 at main control unit 5 detects the system voltage Vu～Vw that supplies to single-phase inverter unit 1 from the input transformer side, the system voltage Vu that detects is supplied to system voltage Phase synchronization detection unit 7, zero of detection system voltage Vu passes through point, generates synchronizing signal Sy.Then, supply with sub controlling unit 8 by the synchronizing signal Sy that will generate, so that 360 ° of counters 9 reset to 0 °, generate the U phase synchronous with system voltage Vu～Z phase signal (gate signal, gating signal).The U phase that generates～Z phase signal is supplied to the grid of each thyristor Q1～Q6 of the rectification part 2 of single-phase inverter unit 1, therefore, can be with the phase locked signal of system voltage rectification part 2 be carried out 120 ° of flow quantity controls.
At this moment, main control unit 5 and sub controlling unit 8 are for one to one, the synchronizing signal Sy that signal between the two transmits with one (1 bit) carries out, delivery time can be shortened, simultaneously, generate and the system voltage Phase synchronization gate drive signal of (synchronously afterwards), can correctly carry out 120 ° of flow quantity controls of the rectification part 2 of system voltage phase place and single-phase inverter unit 1.
Below, with reference to Fig. 3 second embodiment of the invention is described.
In this second execution mode, the system voltage from input transformer Tr that is input to each single-phase inverter unit 1 does not produce phase deviation, therefore, and with a plurality of sub controlling units 8 of main control unit 5 Synchronization Control.
That is, in the second execution mode, as shown in Figure 3, at the input side of input transformer Tr, will from the system voltage Vu～Vw of system power supply 10 supplies, be input to shared main control unit 5.This main control unit 5 is identical with above-mentioned the first execution mode, comprises system voltage test section 6 and system voltage Phase synchronization detection unit 7.And, with sub controlling unit SCu1～SCu3, SCv1～SCv3 and the SCw1～SCw3 of the rectification part 2 that is sent to each single-phase inverter unit U1～U3, V1～V3 that respectively control is connected with the outlet side of input transformer Tr and W1～W3 from the synchronous synchronizing signal Sy of the system voltage Vu～Vw of system voltage Phase synchronization detection unit 7 output.
In this second execution mode, will be sent to from the synchronizing signal Sy that the main control unit 5 that shares is exported sub controlling unit SCu1～SCu3, SCv1～SCv3 and the SCw1～SCw3 of the rectification part 2 of controlling respectively each single-phase inverter unit U1～U3, V1～V3 and W1～W3.Therefore, be sent to the synchronizing signal Sy of each sub controlling unit SCu1～SCu3, SCv1～SCv3 and SCw1～SCw3 from main control unit 5 with an implementation, therefore identical with above-mentioned the first execution mode, can shorten the delivery time.And, in the above-described first embodiment, the quantity of main control unit 5 need to be made as identical with each single-phase inverter unit, but in the second execution mode, as long as a shared main control unit 5 can only be set.Therefore, in the second execution mode, can reduce the quantity of main control unit 5, reduce cost, simultaneously can be so that the overall structure miniaturization.
Below, with reference to Fig. 4 third embodiment of the invention is described.
In the 3rd execution mode, consider in the time of delay of main control unit, in order to generate correct synchronizing signal.
That is, in the 3rd execution mode, such as Fig. 4 and shown in Figure 5, in the above-described 2nd embodiment, be provided with synchronizing signal generating unit 11 at main control unit 5, it generates the synchronizing signal of considering delay time according to system voltage test section 6 and the system voltage that detects at this system voltage test section 6.
Delay time T d when delay time T is included in the system voltage test section 6 detection system voltage of main control unit 5, and the operating delay time τ c that comprises the CPU etc. of main control unit 5, this synchronizing signal generating unit 11 constitutes considers above-mentioned delay time T, and (delay time T) generates synchronizing signal ahead of time.That is, in synchronizing signal generating unit 11, above-mentioned delay time T can be tried to achieve in the design phase, therefore, generated correction synchronizing signal Sya than synchronizing signal Sy advance/retard time τ.Specifically, take voltage threshold Vth shown in the following formula (1) as benchmark, become moment above this voltage threshold Vth state at U phase system magnitude of voltage from the state that is lower than this voltage threshold Vth, synchronizing signal Sya occurs to revise.
Vth＝-Vp×sin{[（τd＋τc）/T]×360°} （1）
At this, Vp represents system voltage peak value [V], and T represents system cycle [s].
According to the 3rd execution mode, shown in Fig. 5 (a), preset the voltage threshold Vth that is calculated by above-mentioned (1) formula in synchronizing signal generating unit 11.Under this state, the U phase system voltage Vu that detects at system voltage test section 6 reduces towards the peak value of minus side, begin to be lower than voltage threshold Vth at moment t1, cross the minus side peak value, when moment t2 begins to surpass voltage threshold Vth, in this t2 moment constantly, shown in Fig. 5 (c), synchronizing signal Sya is revised in output.
At this moment correction synchronizing signal Sya is the zero synchronizing signal Sy shown in Fig. 5 (b) that occurs by the moment t3 of point with respect to above-mentioned the first execution mode at U phase system voltage Vu, generates in the delay time T of the delay time T d of system voltage test section 6 and operating delay time τ c sum ahead of time in advance.
At this moment, the U phase system voltage Vu that detects at system voltage test section 6 is shown in Fig. 5 (a) solid line, system voltage Vur with respect to the illustrated reality of dotted line delays delay time T, therefore, can so that revise synchronizing signal Sya and actual system voltage Vur zero by consistent, can generate correct synchronizing signal.
Then, the correction synchronizing signal Sya of generation transmits to each sub controlling unit SCu1～SCu3, SCv1～SCv3 and SCw1～SCw3.Therefore, revise synchronizing signal Sya according to this, at each sub controlling unit SCu1～SCu3, SCv1～SCv3 and SCw1～SCw3, generate U phase for the rectification part 2 of each single-phase inverter unit U1～U3, V1～V3 and W1～W3～Z phase signal.According to above-mentioned U phase～Z phase signal, the rectification part 2 of each single-phase inverter unit U1～U3, V1～V3 and W1～W3 is carried out and the actual phase locked 120 ° of flow quantity controls of system voltage.
Below, with reference to Fig. 6 four embodiment of the invention is described.
The 4th execution mode considers to produce with respect to system voltage, the input voltage phase that inputs to single-phase inverter unit 1 situation of phase difference.
The input voltage phase of single-phase inverter unit 1 can be tried to achieve in the main circuit design stage of single-phase inverter unit 1 with respect to the phase difference Hd of system voltage phase place.Therefore, in the structure of above-mentioned the second execution mode, at main control unit 5, preset the input voltage phase of single-phase inverter unit 1 with respect to the phase difference Hd of system voltage phase place.And, in main control unit 5, when beginning to drive the series multiplex DC-to-AC converter, from main control unit 5 phase difference Hd is sent by the serial transfer mode to each sub controlling unit SCu1～SCu3, SCv1～SCv3 and SCw1～SCw3.
At sub controlling unit SCu1～SCu3, SCv1～SCv3 and SCw1～SCw3, when receiving phase difference Hd from main control unit 5, with the count value of built-in 360 ° of counters 9 relatively, revise the value that generates U phase～Z phase gate drive signal with phase difference Hd.Thus, can generate 120 ° the gate drive signal synchronous with the input voltage phase of single-phase inverter unit 1.
Below, the action of above-mentioned the 4th execution mode is described, shown in Fig. 6 (a), illustrate with respect to U phase system voltage Vu, the input voltage Vui of single-phase inverter unit 1 produces the situation of 30 ° phase place hysteresis.
In this case, when beginning to drive the series multiplex DC-to-AC converter, at first, for each sub controlling unit SCu1～SCu3, SCv1～SCv3 and SCw1～SCw3, send phase difference Hd(=30 ° in the serial transfer mode from main control unit 5).Therefore, in each sub controlling unit SCu1～SCu3, SCv1～SCv3 and SCw1～SCw3, with phase difference Hd(=30 °) revise the count value value relatively with 360 ° of built-in counters 9.
Therefore, U phase system voltage Vu changes as Fig. 6 (a) solid line diagram, if moment t11 become from negative value change on the occasion of zero by point, then from main control unit 5 to each sub controlling unit SCu1～SCu3, SCv1～SCv3 and SCw1～SCw3 transmit synchronizing signal Sy shown in Fig. 6 (b).
Therefore, in each sub controlling unit SCu1～SCu3, SCv1～SCv3 and SCw1～SCw3, identical with the second execution mode, in the moment that receives synchronizing signal Sy, 360 ° of counters 9 reset to 0 °, and these 360 ° of counters 9 are since 0 ° of counting (count).
At this moment, in the above-described 2nd embodiment, become 30 ° the moment in the count value of 360 ° of counters 9, shown in Fig. 6 (d), U phase signal converts conducting state to, after this, becomes 150 ° of moment in count value, is returned to cut-off state.
But, in the present embodiment, with phase difference Hd(=30 °) revise the count value value relatively with 360 ° of counters 9, therefore, shown in Fig. 6 (e), become 60 ° of moment in the count value of 360 ° of counters 9, U phase signal converts conducting state to, after this, become 180 ° of moment in count value, be returned to cut-off state.
Therefore, can generate the U phase signal of the poor Hd of phase place lagging phase.Equally, for V phase～Z phase signal, also can make it become the signal of the poor Hd of phase place lagging phase.And, the U phase that phase place lags behind～Z phase signal is supplied to the thyristor Q1～Q6 of the rectification part 2 of each single-phase inverter unit 1, therefore, can carry out producing 120 ° of synchronous flow quantity controls of input voltage Vui that phase places lag behind with rectification part 2 in each single-phase inverter unit 1.
In the above-described 4th embodiment, the identical situation of phase difference Hd to the input voltage Vui of each single-phase inverter unit 1 is illustrated, but, the present invention is not limited thereto, in the different situation of the phase difference Hd of the input voltage Vui of each single-phase inverter unit 1, when beginning to drive the series multiplex DC-to-AC converter, can send respectively phase difference Hd to each sub controlling unit SCu1～SCu3, SCv1～SCv3 and SCw1～SCw3 from main control unit 5.
In addition, in above-mentioned the third and fourth execution mode, the situation of the structure that is applicable to above-mentioned the second execution mode has been described, still, the present invention is not limited thereto, also can be applicable to the structure of above-mentioned the first execution mode.
The above is with reference to the accompanying drawings of embodiments of the present invention, but the present invention is not limited to above-mentioned execution mode.Can do all changes in the technology of the present invention thought range, they all belong to protection scope of the present invention.
Claims (5)
1. series multiplex DC-to-AC converter, be connected in series the outlet side of a plurality of single-phase inverters unit that comprises rectification part and inverse transformation section, input side in the rectification part of each single-phase inverter unit, by input transformer difference input AC electric power, this series multiplex DC-to-AC converter is characterised in that:
The rectification part of described each single-phase inverter unit is carried out 120 ° of flow quantity controls,
Described series multiplex DC-to-AC converter comprises:
Main control unit is provided with the system voltage test section and the system voltage Phase synchronization detection unit that are connected with the interchange input side of the rectification part of described each single-phase inverter unit, generates and the phase locked synchronizing signal of system voltage; With
Sub controlling unit is transmitted the described synchronizing signal that is generated by this main control unit, according to the described synchronizing signal that is transmitted, generates the 120 ° circulation width signal synchronous with system voltage, controls the switch motion of the rectification part of described each single-phase inverter unit.
2. series multiplex DC-to-AC converter, be connected in series the outlet side of a plurality of single-phase inverters unit that comprises rectification part and inverse transformation section, input side in the rectification part of each single-phase inverter unit, by input transformer difference input AC electric power, described series multiplex DC-to-AC converter is characterised in that, comprising:
Main control unit is provided with system voltage test section and the system voltage Phase synchronization detection unit of the system voltage of the system side that detects described input transformer, generates and the phase locked synchronizing signal of system voltage; With
A plurality of servicing units are transfused to respectively from the described synchronizing signal of this main control unit output, generate the 120 ° circulation width signal synchronous with described system voltage, control respectively the switch motion of the rectification part of described each single-phase inverter unit.
3. series multiplex DC-to-AC converter according to claim 1 and 2 is characterized in that:
Described main control unit comprises the moment that system voltage detects the time of delay of time of delay and operating delay time in advance, generate the synchronizing signal synchronous with described system voltage, make the output voltage Phase synchronization of described system voltage phase place and described single-phase inverter unit.
4. series multiplex DC-to-AC converter according to claim 1 and 2 is characterized in that:
Described main control unit exists in the situation of phase difference at the input voltage phase of system voltage phase place and described single-phase inverter unit, transmit this phase information to described sub controlling unit in advance, this sub controlling unit has generated for the described synchronizing signal correction that transmits 120 ° of circulation width signal of described phase difference.
5. series multiplex DC-to-AC converter according to claim 3 is characterized in that:
Described main control unit exists in the situation of phase difference at the input voltage phase of system voltage phase place and described single-phase inverter unit, transmit this phase information to described sub controlling unit in advance, this sub controlling unit has generated for the described synchronizing signal correction that transmits 120 ° of circulation width signal of described phase difference.
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| JP2011225918A JP2013090358A (en) | 2011-10-13 | 2011-10-13 | Series multiplex inverter device |
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| JP6358111B2 (en) * | 2015-01-26 | 2018-07-18 | 富士電機株式会社 | Series multiple inverter device |
| KR101798757B1 (en) * | 2016-03-29 | 2017-11-16 | 엘에스산전 주식회사 | Synchronization device in a high voltage direct current system and method thereof |
| DE112018006973T5 (en) * | 2018-01-30 | 2020-10-08 | Mitsubishi Electric Corporation | SERIAL MULTIPLEX INVERTER |
| WO2020087360A1 (en) * | 2018-10-31 | 2020-05-07 | 华为技术有限公司 | Wireless charging receiving apparatus, method, terminal, and system |
| JP7199262B2 (en) * | 2019-03-14 | 2023-01-05 | 東海旅客鉄道株式会社 | Series multiplex power converter |
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