CN103269155A - Discharging control method and system of cascaded and topological power unit - Google Patents
Discharging control method and system of cascaded and topological power unit Download PDFInfo
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- CN103269155A CN103269155A CN2013101858227A CN201310185822A CN103269155A CN 103269155 A CN103269155 A CN 103269155A CN 2013101858227 A CN2013101858227 A CN 2013101858227A CN 201310185822 A CN201310185822 A CN 201310185822A CN 103269155 A CN103269155 A CN 103269155A
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Abstract
The invention discloses a discharging control method and system of a cascaded and topological power unit. The system comprises a command receiving unit and a control unit. The method includes (S1) receiving a command triggering discharging of the power unit, and (S2) connecting an inverter bridge and a bypass circuit, so that two poles of a direct current side capacitor form a short circuit through the inverter bridge and the bypass circuit and discharging is carried out. An auxiliary circuit does not need to be additionally arranged. The direct current side capacitor is short out by means of the inverter bridge and the bypass circuit in the power unit, the fact that voltage of a bus is leaked to a required level within specific time is guaranteed, and dynamic balance control of the bus is effectively coordinated.
Description
Technical field
The present invention relates to a kind of discharge control method and system of power cell of cascaded topology.
Background technology
Several low pressure and low power unit output directly mode of series connection realizes that the topological structure of high pressure output uses more and more widely, is applied in the middle of high voltage converter, STATCOM (claiming STATCOM, static reacance generator or SVG again) and high-pressure blast electric converter.
Unit cascaded topological structure has the following advantages: 1) use the method for series connection withstand voltage low, switching frequency also not high power device can be applied directly to the high-power occasion; 2) can use the power unit by-pass technology in the cascade circuit design, when certain unit broke down, control system can be directly with the trouble unit bypass like this, and circuit still can work on.
Power cell structure as shown in Figure 1a, power cell is made up of rectifier bridge, intermediate dc lateral capacitance and H bridge inverter, and this power cell may be used in the middle of high voltage converter, the high-pressure blast electric converter.Fig. 1 b and Fig. 1 a difference are that Fig. 1 b adopts the rectifier bridge that has IGBT, can realize the four quadrant running of high voltage converter.Another power cell structure as shown in Figure 2, power cell dc bus capacitor and H bridge inverter are formed, and this power cell is applied in the middle of the STATCOM, can form the STATCOM of chain type by the cascade of a plurality of power cells.Fig. 3 is the cellular construction of a neutral-point-clamped formula full-bridge inverter.
Above power cell uses electric capacity as the dc voltage supporting device usually.Since the characteristic of electric capacity, the bleeder of the unit energy when needing to increase discharge circuit as shutdown.If increase discharge circuit in the device, then increased the complexity of power cell, reduce reliability simultaneously, and increased unit and complete machine cost.In addition, owing to the complexity of bus characteristic, increased the difficulty of debugging control.
Summary of the invention
The technical problem to be solved in the present invention is, above-mentioned defective at prior art, a kind of discharge control method and system of power cell of cascade are provided, utilize inverter bridge and bypass circuit short circuit dc bus capacitor in the power cell, reach busbar voltage release needs level and cooperate the effect of bus dynamic equilibrium control, reduced the cost of system simultaneously.
The technical scheme that the present invention solves its technical problem employing is: the discharge control method that a kind of power cell of cascaded topology is provided, power cell comprises dc bus capacitor, inverter bridge and bypass circuit in parallel successively, it is characterized in that, said method comprising the steps of:
S1, reception trigger the instruction of described power cell discharge;
S2, the described inverter bridge of conducting and described bypass circuit make the two poles of the earth of described dc bus capacitor form short circuit by described inverter bridge and described bypass circuit, discharge.
Preferably, described inverter bridge comprises that two two places form four groups of switching devices of two brachium pontis of described inverter bridge, and described step S2 comprises following substep:
S21, the described bypass circuit of conducting;
S22, respectively output have a predetermined duty cycle control signal to described four groups of switching devices, the two poles of the earth that make described dc bus capacitor by being in different brachium pontis in four groups of switching devices respectively last half-bridge and two groups of switching tubes and the described bypass circuit formation short circuit of following half-bridge and conducting simultaneously, discharge.
Preferably, described step S2 also comprises following substep:
S23, between described step S21 and S22, turn-off described four groups of switching devices.
Preferably, described inverter bridge comprises that two two places form four groups of switching devices of two brachium pontis of described inverter bridge, and described step S1 may further comprise the steps:
S24, respectively output have a predetermined duty cycle control signal to described four groups of switching devices;
S25, the described bypass circuit of conducting, the two poles of the earth that make described dc bus capacitor by being in different brachium pontis in four groups of switching devices respectively last half-bridge and two groups of switching tubes and the described bypass circuit formation short circuit of following half-bridge and conducting simultaneously, discharge.
Preferably, described method also comprises step:
S3, when receiving the instruction that stops to discharge, control described inverter bridge and/or described bypass circuit, so that described dc bus capacitor stops discharge.
Preferably, described method also comprises step:
The duty ratio of the control signal of S4, the described four groups of switching devices of adjusting output is to regulate the time of the described dc bus capacitor of short circuit.
A kind of discharge control system of power cell of cascaded topology is provided, and power cell comprises dc bus capacitor, inverter bridge and bypass circuit in parallel successively, and described system comprises:
The command reception unit is used for receiving the instruction that triggers described power cell discharge;
Control unit is used for the described inverter bridge of conducting and described bypass circuit, makes the two poles of the earth of described dc bus capacitor form short circuit by described inverter bridge and described bypass circuit, discharges.
Preferably, described inverter bridge comprises that two two places form four groups of switching devices of two brachium pontis of described inverter bridge, and described control unit comprises:
First control module is used for after receiving the instruction that triggers described power cell discharge the described bypass circuit of conducting;
Second control module, be used for after the described bypass circuit of conducting, exporting respectively the control signal with predetermined duty cycle and arrive described four groups of switching devices, the two poles of the earth that make described dc bus capacitor by being in different brachium pontis in four groups of switching devices respectively last half-bridge and two groups of switching tubes and the described bypass circuit formation short circuit of following half-bridge and conducting simultaneously, discharge.
Preferably, described control unit also comprises:
The 3rd control module is used for before the described bypass circuit of conducting, turn-offing described four groups of switching devices after receiving the instruction that triggers described power cell discharge.
Preferably, described inverter bridge comprises that two two places form four groups of switching devices of two brachium pontis of described inverter bridge, and described control unit comprises:
The 4th control module is used for after receiving the instruction that triggers described power cell discharge, and output has the control signal of predetermined duty cycle to described four groups of switching devices respectively;
The 5th control module, be used in control signal that output has a predetermined duty cycle after described four groups of switching devices, the described bypass circuit of conducting, the two poles of the earth that make described dc bus capacitor by being in different brachium pontis in four groups of switching devices respectively last half-bridge and two groups of switching tubes and the described bypass circuit formation short circuit of following half-bridge and conducting simultaneously, discharge.
The discharge control method of the power cell of a kind of cascade of the present invention and system have following beneficial effect: when device is shut down or busbar voltage when too high; utilize inverter bridge and bypass circuit in the power cell to come the short circuit dc bus capacitor; guarantee in official hour, busbar voltage to be released to the level of needs; cooperate bus dynamic equilibrium control effectively, reduced cost simultaneously.
Description of drawings
Fig. 1 a is the circuit diagram of power cell first embodiment;
Fig. 1 b is the circuit diagram of power cell second embodiment;
Fig. 2 is the circuit diagram of power cell the 3rd embodiment;
Fig. 3 is the circuit diagram of power cell the 4th embodiment;
Fig. 4 is the flow chart of discharge control method first embodiment of the power cell of a kind of cascaded topology of the present invention;
Fig. 5 is a kind of sequential chart during each switching device work in the power cell of a kind of cascaded topology shown in Figure 2;
Fig. 6 is the another kind of sequential chart during each switching device work in the power cell of a kind of cascaded topology shown in Figure 2;
Fig. 7 is the flow chart of discharge control method second embodiment of the power cell of a kind of cascaded topology of the present invention;
Fig. 8 is the flow chart of discharge control method the 3rd embodiment of the power cell of a kind of cascaded topology of the present invention;
Fig. 9 is the functional block diagram of discharge control system first embodiment of the power cell of a kind of cascaded topology of the present invention;
Figure 10 is the functional block diagram of control unit second embodiment of the present invention;
Figure 11 is the functional block diagram of control unit the 3rd embodiment of the present invention.
Embodiment
Below in conjunction with specific embodiments and the drawings the present invention will be further explained explanation.
As Fig. 1 a, Fig. 1 b, Fig. 2 and shown in Figure 3, power cell 100 comprises dc bus capacitor 110 in parallel successively, inverter bridge 120 and bypass circuit 130(existing structure), wherein, inverter bridge 120 comprises four groups of switching devices 121 of two brachium pontis of two two places composition inverter bridge 120,122,123,124, wherein, switching device group 121 and 122 constitutes a brachium pontis, switching device group 123 and 124 constitutes another brachium pontis, switching device group 121 and 124 is positioned at the last half-bridge of inverter bridge 120, switching device group 122 and 123 is positioned at the following half-bridge of inverter bridge 120, and four groups of switching device 121-124 can be controllable semiconductor device or other electronic switching devices.As shown in Figure 2, in this embodiment, comprise in first group of switching device 121 and comprise in switching device S1, the second group of switching device 122 and comprise in switching device S3, the 4th group of switching device 124 in switching device S2, the 3rd group of switching device 123 and comprise switching device S4.As shown in Figure 3, in this embodiment, dc bus capacitor 110 comprises capacitor C 1 and the capacitor C 2 of series connection, comprise switching device S11 and S12 in first group of switching device 121, comprise in second group of switching device 122 comprising in switching device S21 and S22, the 3rd group of switching device 123 in switching device S31 and S32, the 4th group of switching device 124 and comprising switching device S41 and S42.Each switching device S1-S4, S11-S42 are example with insulated gate bipolar transistor (IGBT), and control signal is from its grid input.Bypass circuit 130 can comprise relay, contactor etc., perhaps other circuit.
Fig. 4 is the flow chart that the discharge control method first of the power cell 100 of a kind of cascaded topology of the present invention is implemented, and as shown in Figure 4, in the present embodiment, method of the present invention may further comprise the steps:
S1, reception trigger the instruction of power cell 100 discharges;
S2, conducting inverter bridge 120 and bypass circuit 130 make the two poles of the earth of dc bus capacitor 110 form short circuit by inverter bridge 120 and bypass circuit 130, discharge.
In the step S1 of present embodiment, surpass when device shutdown, break down (for example busbar voltage is too high), busbar voltage under the situation of a preset threshold value or manual command's input, will receive the instruction that triggers power cell 100 discharges.
In the present embodiment, described step S2 comprises following substep:
S21, conducting bypass circuit 130;
S22, respectively output have the control signal of predetermined duty cycle to four groups of switching devices 121,122,123,124, the two poles of the earth that make dc bus capacitor 110 by being in different brachium pontis in four groups of switching devices 121,122,123,124 respectively last half-bridge and two groups of switching tubes 121 of following half-bridge and conducting simultaneously, 123 or 122,124 and bypass circuit 130 form short circuits, discharge.
Among the step S2, after receiving the instruction that triggers power cell 100 discharges, at first the conducting bypass circuit 130, and then the control signal of exporting predetermined duty cycle respectively is to four groups of switching device 121-124, control the conducting of four groups of switching device 121-124 or end, make and be in the last half-bridge of different brachium pontis and two groups of switching tubes 121 of following half-bridge, 123 or 122,124 conductings simultaneously, like this, the two poles of the earth of direct current survey electric capacity 110 have formed short circuit by switching device group and the bypass circuit 130 of conducting in the inverter bridge 120, at this moment, dc bus capacitor 110 discharges.
Wherein, step S22 can specifically may further comprise the steps: S221, respectively output duty cycle unequal and all greater than two control signals of 50% to the last half-bridge of inverter bridge 120 or the two groups of switching devices 121,124 or 122,123 in time half-bridge; S222, the control signal of output with corresponding duty ratio be to the following half-bridge of inverter bridge 120 or go up two groups of switching devices 122,123 or 121,124 in the half-bridge respectively.And step S221 and S222 are for carrying out simultaneously.
Be example with power cell shown in Figure 2 100, referring to (Fig. 1 a, Fig. 1 b and power cell 100 shown in Figure 3 are by that analogy) shown in Figure 5, for the switching device S1 output duty cycle in the last half-bridge of inverter bridge 120 is 60% control signal, be 70% control signal for the switching device S4 output duty cycle in the last half-bridge.As everyone knows, the duty ratio sum for the control signal of the switching device output that belongs to a brachium pontis is 100%.Therefore, need be 40% control signal for the switching device S2 output duty cycle in the following half-bridge, be 30% control signal for the switching device S3 output duty cycle in the following half-bridge.
Be the beginning of a work period constantly with T0, during T0-T1, switching device S1 and S4 conducting, switching device S2 and S3 turn-off, be two switching device S1, the S4 conducting in the half-bridge on the inverter bridge 120, two switching device S2, S3 in the following half-bridge turn-off, and at this moment, the voltage that dc bus capacitor 110 applies can not form electric current in inverter bridge 120.Because the balance of voltage on two brachium pontis of inverter bridge 120, there is not electrical potential difference in bypass circuit 130 two ends, just do not have electric current to flow through on the bypass circuit 130 yet, make bypass circuit 130 be in idle state.
During T1-T2, switching device S1 becomes shutoff from conducting, and switching device S2 becomes conducting from shutoff, and switching device S3 and the S4 attitude of remaining stationary is constant.At this moment, be in switching device S4 and the S2 conducting simultaneously of last half-bridge and the following half-bridge of different brachium pontis, dc bus capacitor 110, switching device S4, bypass circuit 130 and switching device S2 have formed a loop, and the voltage of dc bus capacitor 110 (busbar voltage) is released, and namely dc bus is by short circuit.
During T2-T3, switching device S3 becomes conducting from shutoff, and switching device S4 becomes shutoff from conducting, and switching device S1 and the S2 attitude of remaining stationary is constant, and the voltage that dc bus capacitor 110 applies can not form electric current in inverter bridge 120.Afterwards, switching device S1-S4 will periodically repeat the alternating movement of turn-on and turn-off during T1-T3, when switching device S2 and S4 conducting simultaneously, and the voltage (busbar voltage) of the dc bus capacitor 110 of releasing.
In like manner can get, be respectively two switching device S2 in the following half-bridge of inverter bridge 120 and the S3 output duty cycle is unequal and all greater than two control signals of 50%, be respectively two switching device S1 of half-bridge and the situation that S4 output has the control signal of corresponding duty ratio.At this moment, when switching device S1 and S3 conducting simultaneously, the voltage (busbar voltage) of the dc bus capacitor 110 of releasing.Power cell 100 shown in Figure 3 is when carrying out discharge operation, and switching device S11 and S12, switching device S21 and S22, switching device S31 and S32, switching device S41 and S42 are equivalent to switching device S1, switching device S2, switching device S3, the switching device S4 in the power cell shown in Figure 2 100 respectively.
In other embodiments, step S22 can may further comprise the steps: S223, output duty cycle two groups of switching devices 121,122 or 123,124 that are 50% control signal in the brachium pontis of inverter bridge 120 respectively; S224, respectively export a duty ratio greater than 50%, duty ratio less than 50% and two duty ratio and the two groups of switching devices 123,124 or 121,122 that are two control signals of 100% in another brachium pontis of inverter bridge 120.
Be example with power cell shown in Figure 2 100, (Fig. 1 a, Fig. 1 b and power cell 100 shown in Figure 3 are by that analogy) as shown in Figure 6, for switching device S1, S2 output duty cycle in the brachium pontis of inverter bridge 120 are 50% control signal, for the switching device S3 in another brachium pontis and S4 respectively output duty cycle be 30% and 70% control signal.
Be the beginning of a work period constantly with T0, during T0-T1, switching device S1 and S4 conducting, switching device S2 and S3 turn-off, be two switching device S1, the S4 conducting in the half-bridge on the inverter bridge 120, two switching device S2, S3 in the following half-bridge turn-off, so the voltage that dc bus capacitor 110 applies can not form electric current in inverter bridge 120.Simultaneously, because the balance of voltage on two brachium pontis of inverter bridge 120, there is not electrical potential difference in bypass circuit 130 two ends, just do not have electric current to flow through on the bypass circuit 130 yet, make bypass circuit 130 be in idle state.
During T1-T2, switching device S1 becomes shutoff from conducting, and switching device S2 becomes conducting from shutoff, and switching device S3 and the S4 attitude of remaining stationary is constant.At this moment, be in the switching device S4 of half-bridge and be in the switching device S2 conducting simultaneously of half-bridge down, dc bus capacitor 110, switching device S4, bypass circuit 130 and switching device S2 have formed a loop, and the voltage of dc bus capacitor 110 (busbar voltage) is released.
During T2-T3, switching device S3 becomes conducting from shutoff, and switching device S4 becomes shutoff from conducting, and switching device S1 and the S2 attitude of remaining stationary is constant, and the voltage that dc bus capacitor 110 applies can not form electric current in inverter bridge 120.Afterwards, switching device S1-S4 will periodically repeat the alternating movement of turn-on and turn-off during T1-T3, when switching device S2 and S4 conducting simultaneously, and the voltage (busbar voltage) of the dc bus capacitor 110 of releasing.
In like manner can get, be respectively two the switching device S3, the S4 output duty cycle that belong to a brachium pontis in the inverter bridge 120 and be 50% control signal, for the switching device S2 in another brachium pontis and S1 respectively output duty cycle be the situation of 30% and 70% control signal.Equally, power cell 100 shown in Figure 3 is when carrying out discharge operation, and switching device S11 and S12, switching device S21 and S22, switching device S31 and S32, switching device S41 and S42 are equivalent to switching device S1, switching device S2, switching device S3, the switching device S4 in the power cell shown in Figure 2 100 respectively.
In the present invention; can export the control signal of multiple duty ratio for four groups of switching device 121-124; as long as can make two groups of switches 121,123 or 122,124 conductings simultaneously of the last half-bridge that is in different brachium pontis in four groups of switching tubes 121,122,123,124 respectively and following half-bridge; thereby use inverter bridge 120, bypass circuit 130 in the power cell 100 to come the short circuit dc bus, all should be included in protection scope of the present invention.
In second embodiment of control method of the present invention, the difference of itself and first embodiment is, step S2 also comprises following substep: S23, between step S21 and S22, turn-offs four groups of switching devices 121,122,123,124.That is to say, after conducting bypass circuit 130, turn-off four groups of switching devices 121,122,123,124, and then output has the control signal of predetermined duty cycle to four groups of switching devices 121,122,123,124 respectively.
In the 3rd embodiment of control method of the present invention, the difference of itself and first embodiment is that what step S2 comprised is following step:
S24, respectively output have the control signal of predetermined duty cycle to four groups of switching devices 121,122,123,124;
S25, conducting bypass circuit 130, the two poles of the earth that make dc bus capacitor 110 by being in different brachium pontis in four groups of switching devices 121,122,123,124 respectively last half-bridge and two groups of switching tubes 121 of following half-bridge and conducting simultaneously, 123 or 122,124 and bypass circuit 130 form short circuits, discharge.
In this embodiment, after receiving the instruction that triggers power cell 100 discharges, at first export the control signal with predetermined duty cycle and arrive described four groups of switching devices 121,122,123,124, and then conducting bypass circuit 130, thereby short circuit dc bus capacitor 110.
The flow chart that Fig. 7 implements for the discharge control method second of the power cell 100 of a kind of cascaded topology of the present invention, as shown in Figure 7, the difference of present embodiment and control method of the present invention first embodiment is that method of the present invention also comprises step:
S3, when receiving the instruction that stops to discharge, control inverter bridge 120 and/or bypass circuit 130 are so that dc bus capacitor 110 stops discharge.
If be among the step S1 under the situation of situation that device is shut down or manual command's input, receive the instruction that triggers power cell 100 discharges, at this moment, be specially conducting bypass circuit 130 among the step S3, and control inverter bridge 120 quits work; If be to break down among the step S1, for example busbar voltage is too high or busbar voltage when surpassing a preset threshold value, receive the instruction that triggers power cell 100 discharges, then be specially among the step S3 and only disconnect bypass circuit 130, inverter still can be in running order.
The flow chart that Fig. 8 implements for the discharge control method second of the power cell 100 of a kind of cascaded topology of the present invention, as shown in Figure 8, the difference of present embodiment and control method of the present invention first embodiment is that method of the present invention also comprises step:
S4, regulate the duty ratio of four groups of switching devices 121 of output, 122,123,124 control signal, to regulate the time of short circuit dc bus capacitor 110.
In the present invention, can export the control signal of multiple duty ratio for four groups of switching device 121-124, so that be in two groups of switches 121,123 or 122,124 conductings simultaneously of last half-bridge and the following half-bridge of different brachium pontis in four groups of switching tubes 121,122,123,124 respectively, and the duty ratio by four groups of switching devices 121 of control output, 122,123,124 control signal can realize regulating time of short circuit dc bus capacitor 110.
As seen; implement said method of the present invention; need not to increase extra auxiliary circuit; shut down or busbar voltage when too high at device; utilize inverter bridge 120 and bypass circuit 130 in the power cell 100 to come short circuit dc bus capacitor 110; guarantee that (as the T1-T2 among Fig. 5) releases busbar voltage to the level of needs in official hour, cooperated bus dynamic equilibrium control effectively.And, can recently reach the amplitude of busbar short-circuit electric current and the control of time by the duty of controlling the control signal of exporting switching device group 121-124.
The functional block diagram that Fig. 9 implements for the discharge control system 200 first of the power cell of a kind of cascaded topology of the present invention, as shown in Figure 9, in the present embodiment, system 200 of the present invention comprises:
Command reception unit 210 is used for receiving the instruction that triggers power cell 100 discharges;
Control unit 220 is used for conducting inverter bridge 120 and bypass circuit 130, makes the two poles of the earth of dc bus capacitor 110 form short circuit by inverter bridge 120 and bypass circuit 130, discharges;
The duty ratio of four groups of switching devices 121 of output, 122,123,124 control signal be used for to be regulated, to regulate the time of short circuit dc bus capacitor 110 in duty cycle adjustment unit 230;
Stop discharge cell 240, be used for when receiving the instruction that stops to discharge, control inverter bridge 120 and/or bypass circuit 130 are so that dc bus capacitor 110 stops discharge.
Wherein, control unit 220 comprises:
First control module 221 is used for after receiving the instruction that triggers power cell 100 discharges conducting bypass circuit 130;
Second control module 222, be used for after conducting bypass circuit 130, exporting respectively and have the control signal of predetermined duty cycle to four groups of switching devices 121,122,123,124, the two poles of the earth that make dc bus capacitor 110 by being in different brachium pontis in four groups of switching devices 121,122,123,124 respectively last half-bridge and two groups of switching tubes 121 of following half-bridge and conducting simultaneously, 123/122,124 and bypass circuit 130 form short circuits, discharge.
As shown in figure 10, in second embodiment of the discharge control system 200 of the power cell of a kind of cascaded topology of the present invention, compare with control system 200 first embodiment of the present invention, difference is that control unit 220 also comprises:
The 3rd control module 223 is used for before the conducting bypass circuit 130, turn-offing four groups of switching devices 121,122,123,124 after receiving the instruction that triggers power cell 100 discharges.
As shown in figure 11, in the 3rd embodiment of the discharge control system 200 of the power cell of a kind of cascaded topology of the present invention, compare with control system 200 first embodiment of the present invention, difference is that control unit 220 comprises:
The 4th control module 224 is used for after receiving the instruction that triggers power cell 100 discharges, and output has the control signal of predetermined duty cycle to described four groups of switching devices 121,122,123,124 respectively;
The 5th control module 225, be used for having the control signal of predetermined duty cycle after four groups of switching devices 121,122,123,124 in output, conducting bypass circuit 130, the two poles of the earth that make dc bus capacitor 110 by being in different brachium pontis in four groups of switching devices 121,122,123,124 respectively last half-bridge and two groups of switching tubes 121 of following half-bridge and conducting simultaneously, 123/122,124 and bypass circuit 130 form short circuits, discharge.
The control of discharging of 200 pairs of power cells 100 of control system of the present invention; make power cell 100 shut down or busbar voltage when too high at device; utilize inverter bridge 120 and bypass circuit 130 in the power cell 100 to come the short circuit dc bus capacitor; guarantee in official hour, busbar voltage to be released to the level of needs; and; can recently reach the amplitude of busbar short-circuit electric current and the control of time by the duty of controlling the control signal of exporting switching device group 121-124; cooperate bus dynamic equilibrium control effectively, reduced cost simultaneously.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.The sequence number of each step is not used in restriction the present invention in the control method of the present invention, and the technical characterictic among each embodiment can use separately also and can be used in combination among the present invention.
Claims (10)
1. the discharge control method of the power cell of a cascaded topology, power cell (100) comprise dc bus capacitor (110), inverter bridge (120) and bypass circuit (130) in parallel successively, it is characterized in that, said method comprising the steps of:
S1, reception trigger the instruction of described power cell (100) discharge;
S2, the described inverter bridge of conducting (120) and described bypass circuit (130) make the two poles of the earth of described dc bus capacitor (110) form short circuit by described inverter bridge (120) and described bypass circuit (130), discharge.
2. the discharge control method of the power cell of a kind of cascaded topology according to claim 1, it is characterized in that, described inverter bridge (120) comprises that two two places form four groups of switching devices (121,122,123,124) of two brachium pontis of described inverter bridge (120), and described step S2 comprises following substep:
S21, the described bypass circuit of conducting (130);
S22, respectively output have a predetermined duty cycle control signal to described four groups of switching devices (121,122,123,124), the two poles of the earth that make described dc bus capacitor (110) by being in different brachium pontis in four groups of switching devices (121,122,123,124) respectively last half-bridge and two groups of switching tubes (121,123/122,124) and described bypass circuit (130) the formation short circuit of following half-bridge and conducting simultaneously, discharge.
3. the discharge control method of the power cell of a kind of cascaded topology according to claim 2 is characterized in that, described step S2 also comprises following substep:
S23, between described step S21 and S22, turn-off described four groups of switching devices (121,122,123,124).
4. the discharge control method of the power cell of a kind of cascaded topology according to claim 1, described inverter bridge (120) comprises that two two places form four groups of switching devices (121,122,123,124) of two brachium pontis of described inverter bridge (120), it is characterized in that described step S1 may further comprise the steps:
S24, respectively output have a predetermined duty cycle control signal to described four groups of switching devices (121,122,123,124);
S25, the described bypass circuit of conducting (130), the two poles of the earth that make described dc bus capacitor (110) by being in different brachium pontis in four groups of switching devices (121,122,123,124) respectively last half-bridge and two groups of switching tubes (121,123/122,124) and described bypass circuit (130) the formation short circuit of following half-bridge and conducting simultaneously, discharge.
5. the discharge control method of the power cell of a kind of cascaded topology according to claim 1 is characterized in that, described method also comprises step:
S3, when receiving the instruction that stops to discharge, control described inverter bridge (120) and/or described bypass circuit (130), make described dc bus capacitor (110) stop discharge.
6. according to the discharge control method of the power cell of each described a kind of cascaded topology among the claim 2-4, it is characterized in that described method also comprises step:
The duty ratio of the control signal of S4, the adjusting described four groups of switching devices of output (121,122,123,124) is to regulate the time of the described dc bus capacitor of short circuit (110).
7. the discharge control system of the power cell of a cascaded topology, power cell (100) comprise dc bus capacitor (110), inverter bridge (120) and bypass circuit (130) in parallel successively, and described system comprises:
Command reception unit (210) is used for receiving the instruction that triggers described power cell (100) discharge;
Control unit (220) is used for the described inverter bridge of conducting (120) and described bypass circuit (130), makes the two poles of the earth of described dc bus capacitor (110) form short circuit by described inverter bridge (120) and described bypass circuit (130), discharges.
8. the discharge control system of the power cell of a kind of cascaded topology according to claim 7, it is characterized in that, described inverter bridge (120) comprises that two two places form four groups of switching devices (121,122,123,124) of two brachium pontis of described inverter bridge (120), and described control unit (220) comprising:
First control module (221) is used for after receiving the instruction that triggers described power cell (100) discharge the described bypass circuit of conducting (130);
Second control module (222), be used for exporting the control signal with predetermined duty cycle afterwards respectively at the described bypass circuit of conducting (130) and arrive described four groups of switching devices (121,122,123,124), the two poles of the earth that make described dc bus capacitor (110) by being in different brachium pontis in four groups of switching devices (121,122,123,124) respectively last half-bridge and two groups of switching tubes (121,123/122,124) and described bypass circuit (130) the formation short circuit of following half-bridge and conducting simultaneously, discharge.
9. the discharge control system of the power cell of a kind of cascaded topology according to claim 8 is characterized in that, described control unit (220) also comprises:
The 3rd control module (223) is used for after receiving the instruction that triggers described power cell (100) discharge, and the described bypass circuit of conducting (130) turn-offs described four groups of switching devices (121,122,123,124) before.
10. the discharge control system of the power cell of a kind of cascaded topology according to claim 7, it is characterized in that, described inverter bridge (120) comprises that two two places form four groups of switching devices (121,122,123,124) of two brachium pontis of described inverter bridge (120), and described control unit (220) comprising:
The 4th control module (224) is used for after receiving the instruction that triggers described power cell (100) discharge, and output has the control signal of predetermined duty cycle to described four groups of switching devices (121,122,123,124) respectively;
The 5th control module (225), for the control signal that has predetermined duty cycle in output to described four groups of switching devices (121,122,123,124) afterwards, the described bypass circuit of conducting (130), the two poles of the earth that make described dc bus capacitor (110) by being in different brachium pontis in four groups of switching devices (121,122,123,124) respectively last half-bridge and two groups of switching tubes (121,123/122,124) and described bypass circuit (130) the formation short circuit of following half-bridge and conducting simultaneously, discharge.
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| CN109245505A (en) * | 2018-10-12 | 2019-01-18 | 蔚来汽车有限公司 | Bus capacitor charging method, system and device for power device |
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