WO2015001597A1 - 7レベルインバータ装置 - Google Patents
7レベルインバータ装置 Download PDFInfo
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- WO2015001597A1 WO2015001597A1 PCT/JP2013/067974 JP2013067974W WO2015001597A1 WO 2015001597 A1 WO2015001597 A1 WO 2015001597A1 JP 2013067974 W JP2013067974 W JP 2013067974W WO 2015001597 A1 WO2015001597 A1 WO 2015001597A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/49—Combination of the output voltage waveforms of a plurality of converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/14—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation with three or more levels of voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
Definitions
- This invention relates to a 7-level inverter device configured by connecting a single-phase 5 level inverter in series with each phase of a 3-phase 3 level inverter.
- Patent Document 1 is a configuration in which a single-phase inverter is connected in series to the output of each phase of a three-phase two-level inverter. It is conceivable to adopt a so-called 7-level inverter configuration in which single-phase 5 level inverters are connected in series to the output of each phase.
- this 7-level inverter from the viewpoint of selecting which switching element to perform pulse width control for obtaining a desired voltage, various selections are possible, so that control becomes complicated. In some cases, the operation becomes unstable.
- the present invention has been made in view of the above, and an object thereof is to provide a seven-level inverter device having a relatively simple configuration and stable control characteristics.
- the seven-level inverter device of the present invention has a three-phase three-level inverter that converts the direct current of the three-level first direct-current power supply into an alternating current, and has the same voltage as the first direct-current power supply.
- Three single-phase five-level inverters that convert the direct current of the second three-level DC power source into alternating current and whose output is connected in series to the output of each phase of the three-phase three-level inverter, and for each phase And 7-level pulse width control means for supplying a gate pulse to the switching element constituting the single-phase 5-level inverter of the phase and the phase of the 3-level inverter by controlling the pulse width of a given voltage reference
- the pulse width control means converts the voltage reference into a voltage level of the phase subjected to pulse width modulation, and the three levels based on the transition of the voltage level.
- State transition means for determining the output of the switching leg of the relevant phase of the inverter and the outputs of the switching legs on the outer and inner sides of the single-phase five-level inverter, the state transition means when the voltage level is positive
- the three outputs of the switching leg of the corresponding phase of the three-level inverter and the three outputs of the outer and inner switching legs of the single-phase five-level inverter are set to 0 or positive, and when the voltage level is negative, When the voltage level is 0 when all of the three outputs of the switching leg of the corresponding phase of the three-level inverter and the outer and inner switching legs of the single-phase five-level inverter are 0, the 3
- the switching leg of the corresponding phase of the level inverter, the switching leg outside and inside the single-phase five-level inverter Any of One output is characterized in that so as to be 0.
- the block block diagram of the 7 level inverter apparatus which concerns on one Example of this invention.
- the internal block diagram of the single phase 5 level inverter part of the 7 level inverter apparatus which concerns on one Example of this invention.
- the internal block block diagram of the main-control part of the 7 level inverter apparatus which concerns on one Example of this invention.
- the internal block block block diagram of the pulse width control part of the main control part of the 7 level inverter apparatus which concerns on one Example of this invention.
- FIG. 1 is a block diagram of a 7-level inverter device according to an embodiment of the present invention.
- a three-phase three-level inverter 1 outputs a three-level DC voltage, and the three-phase outputs are connected to drive an AC motor 3 through single-phase five-level inverters 2U, 2V, and 2W, respectively. . That is, each phase voltage of the three-phase three-level inverter 1 is boosted by the output voltage of the single-phase five-level inverters 2U, 2V, and 2W, and is connected to the U, V, and W phase terminals of the AC motor 3, respectively. .
- the gate signals of the switching elements constituting the three-phase three-level inverter 1 and the single-phase five-level inverters 2U, 2V and 2W are given from the main controller 4.
- a voltage detector 5 for detecting a three-level DC voltage signal is provided in the three-phase three-level inverter 1 as a control feedback signal, and the detected voltage is given to the main controller 4.
- voltage detectors 5U, 5V, and 5W for detecting a three-level DC voltage signal are provided in single-phase five-level inverters 2U, 2V, and 2W, respectively, and these detected voltages are given to main controller 4.
- the U-phase and W-phase input currents of the AC motor 3 are detected by current detectors 6U and 6W, respectively, and these detected currents Iu and Iw are also given to the main controller 4.
- FIG. 2 is an internal configuration diagram of the three-phase three-level inverter 1.
- Switching legs 11U, 11V, and 11W are connected in parallel with a three-level DC power source configured by a series circuit of a positive side DC power source 10P and a negative side DC power source 10N.
- the switching leg 11U includes switching elements CU1, CU2, CU3, and CU4 connected in series.
- a free-wheeling diode is connected in antiparallel to each switching element.
- the connection point between the switching elements CU1 and CU2 and the connection point between the switching elements CU3 and CU4 are clamped at a midpoint potential by positive and negative clamp diodes, respectively.
- a connection point between the switching elements CU2 and CU3 is a U-phase AC output terminal UC. Since the configuration of the switching legs 11V and 11W is basically the same as that of the switching leg 11U, description thereof will be omitted.
- the positive side DC voltage VdcP and the negative side DC voltage VdcN are detected by the voltage detector 5, and the detected voltages are given to the main controller 4. Further, the gate signal Gate-U from the main controller 4 for the switching elements CU1, CU2, CU3, and CU4, and the gate signal Gate-V from the main controller 4 for the switching elements CV1, CV2, CV3, and CV4. However, the gate signal Gate-W is given from the main controller 4 to the switching elements CW1, CW2, CW3, and CW4, respectively.
- FIG. 3 is an internal configuration diagram of the single-phase five-level inverter 2U.
- the single-phase five-level inverter 2U is a so-called step-up inverter that connects the U-phase output terminal UC and the output terminal UA of the above-described three-phase three-level inverter 1 and boosts the output to obtain the phase output terminal UB. Since the single-phase five-level inverters 2V and 2W have basically the same internal configuration as the single-phase five-level inverter 2U, illustration and description thereof are omitted, and the internal configuration of the single-phase five-level inverter 2U will be described below.
- Switching legs 21UO and 21UI are connected in parallel with a three-level DC power source constituted by a series circuit of a positive side DC power source 20UP and a negative side DC power source 20UN.
- the switching leg 21UO is composed of switching elements BU1, BU2, BU3, and BU4 connected in series.
- a free-wheeling diode is connected in antiparallel to each switching element.
- the connection point between the switching elements BU1 and BU2 and the connection point between the switching elements BU3 and BU4 are clamped to the midpoint potential by positive and negative clamp diodes, respectively.
- the connection point between the switching elements BU2 and BU3 becomes the U-phase output terminal UB, and is connected to the U-phase terminal of the AC motor 3.
- the switching leg 21UI is composed of switching elements AU1, AU2, AU3, and AU4 connected in series.
- a free-wheeling diode is connected in antiparallel to each switching element.
- the connection point between the switching elements AU1 and AU2 and the connection point between the switching elements AU3 and AU4 are clamped at the midpoint potential by positive and negative clamp diodes, respectively.
- the connection point between the switching elements AU2 and AU3 serves as the output terminal UA and is connected to the U-phase output terminal UC of the three-level inverter 1.
- the positive side DC voltage VdcuP and the negative side DC voltage VdcuN are detected by the voltage detector 5U, and the detected voltages are given to the main controller 4.
- a gate signal Gate-u is given from the main controller 4 to the switching elements BU1, BU2, BU3, BU4 and the switching elements AU1, AU2, AU3, and AU4.
- the possible values of the U-phase output voltage of the switching leg 21UI and the switching leg 21UO of the single-phase five-level inverter 2U are three values: + E, 0, and -E, respectively. Therefore, there are seven possible values of the U-phase output voltage of the boosted inverter: + 3E, + 2E, + E, 0, ⁇ E, ⁇ 2E, ⁇ 3E. Since the same applies to the V-phase and the W-phase, it can be seen that the inverter obtained by boosting each of the three-phase outputs of the three-phase three-level inverter 1 by the single-phase five-level inverters 2U, 2V, and 2W becomes a seven-level inverter.
- the single-phase five-level inverter 2U can take three values, + E, 0, and -E, respectively, the single-phase five-level inverter It can also be seen that the 2U phase output voltage is five types: + 2E, + E, 0, -E, -2E.
- the single-phase five-level inverter is simply referred to as a five-level inverter.
- FIG. 4 is an internal configuration diagram of the main controller 4.
- the three-phase voltage references VU_REF, VV_REF, and VW_REF obtained by the motor controller 7 are given to the pulse width controllers 8U, 8V, and 8W, respectively.
- the motor control unit 7 performs speed control so that the speed feedback signal of the AC motor 3 becomes a desired speed reference, and the current feedback signal matches the output current reference.
- current control is performed so as to output such a voltage reference, but these are not shown.
- the pulse width control unit 8U includes a positive DC voltage VdcP and a negative DC voltage VdcN of the three-phase three-level inverter 1, a positive DC voltage VdcuP and a negative DC voltage VdcuP of the 5-level inverter 2U, and a U-phase current Iu.
- the gate signal Gate-U for the three-phase three-level inverter 1 and the gate signal Gate-u for the five-level inverter 2U are output.
- the pulse width control unit 8W includes a positive DC voltage VdcP and a negative DC voltage VdcN of the three-phase three-level inverter 1, a positive DC voltage VdcwP and a negative DC voltage VdcwN of the five-level inverter 2W, and a W-phase current. Iw is given, and a gate signal Gate-W for the three-phase three-level inverter 1 and a gate signal Gate-w for the five-level inverter 2W are output.
- the pulse width controller 8V includes a positive DC voltage VdcP and a negative DC voltage VdcN of the three-phase three-level inverter 1, a positive DC voltage VdcwP and a negative DC voltage VdcwN of the five-level inverter 2V, and a V-phase current.
- Iv is given, and the gate signal Gate-V for the three-phase three-level inverter 1 and the gate signal Gate-v for the five-level inverter 2V are output.
- the pulse width control units 8U, 8V, 8W basically perform the same operation. Accordingly, the U-phase pulse width control unit 8U will be described below, and the description of the other phases will be omitted.
- FIG. 5 is an internal block diagram of the pulse width control unit 8U.
- FIG. 6 is an operation explanatory diagram regarding PWM pulse generation of the pulse width control unit 8U.
- a sine wave U-phase voltage reference VU_REF as shown in the upper part of FIG. 6 is given to the voltage correction unit 81 of FIG.
- a virtual triangular wave carrier is used in which six stages of triangular wave carriers with the same phase plus a DC offset are arranged.
- the U-phase voltage reference VU_REF is normalized and corrected within a range of ⁇ 1 so that a gate pulse can be obtained with one triangular wave carrier.
- a PWM voltage level Vu_LV as shown in the lower part is obtained.
- the carrier selection CARu_SEL is obtained by the voltage correction unit 81, and, depending on the magnitude of the U-phase voltage reference VU_REF, as shown in the second stage from the top and bottom of FIG. It is an integer number of steps.
- the corrected voltage reference Vu_REF_T can be expressed by the following equation.
- Vu_REF_T 6, VU_REF-2, CARu_SEL-1 (1)
- the PWM voltage level Vu_LV is given to the state transition unit 84.
- this state transition device 84 the switching states of the switching legs 11U of the three-phase three-level inverter 1 and the switching elements of the five-level inverter 2U for outputting a given PWM voltage level Vu_LV are sequentially determined.
- the VDC 5u obtained by averaging the positive DC voltage VdcuP and the negative DC voltage VdcuN by the average value circuit 85A, the positive DC voltage VdcP, and the negative DC A signal VDC3 obtained by averaging the voltage VdcN by the average value circuit 85B and a signal obtained by determining whether the U-phase current Iu is positive / negative by the positive / negative determination circuit 86 are supplied to the state transition unit 84.
- the operation of the state transition unit 84 will be described.
- the switching leg 11U of the three-phase three-level inverter 1 and the outer switching leg 21UO and the inner switching leg 21UI of the five-level inverter 2U can take.
- there are three possible states that is, + E, 0, and ⁇ E, so that there are 27 possible combinations of 3 to the 3rd power.
- the output voltages of the switching leg 11U of the three-phase three-level inverter 1 and the outer switching leg 21UO of the five-level inverter 2U are positive, the U-phase voltage of the seven-level inverter is positively added.
- state transition rules are defined as shown in FIG. That is, when the output voltage of a certain phase is positive, all the outputs of the switching leg of the three-level inverter corresponding phase and the outer and inner switching legs of the corresponding five-level inverter are set to + E or 0 and become -E Is excluded. Similarly, when the output voltage of a certain phase is negative, the output of the switching leg of the three-level inverter corresponding phase and the outer and inner switching legs of the five-level inverter of the corresponding phase is set to 0 or ⁇ E, and becomes + E The state is excluded.
- FIG. 8 is an explanatory diagram regarding the state transition of the pulse width control unit common to each phase.
- the output voltage level is -3E, 0, + 3E, there is only one choice of possible state combinations.
- FIG. 8 shows which switching leg is switched to the next voltage level. That is, 3 indicates a 3-level inverter, 5o indicates the outside of the 5-level inverter, and 5i indicates the inside of the 5-level inverter.
- the difference voltage between the DC voltage average value VDC5u of the U-phase 5-level inverter shown in FIG. 5 and the DC voltage average value VDC3 of the 3-level inverter is The combination of the states of each switching leg is selected so as to reduce the number. This selection method is shown in the flowchart of FIG.
- the current voltage level is determined by whether VuLV is large or small with respect to the previous state (ST1).
- step ST2 it is determined whether or not the difference between the average value of VdcxP and VdcxN (Vdc5x) and the average value of VdcP and VdcN (Vdc3) is larger than the threshold (step ST4).
- step ST2 If the difference is smaller than the threshold value in step ST2, an option for switching a leg that has not been switched for the longest time is selected from two to three options (ST5). If the voltage difference is larger than the threshold value in step ST4, it is checked whether the average value (Vdc5x) of VdcxP and VdcxN is larger than the average value (Vdc3) of VdcP and VdcN (ST6). If YES in step ST6, a state is selected in which VdxP and VdcxN are discharged or VdcP and VdcN are charged (ST7). On the other hand, if NO, a state is selected in which VdxP and VdcxN are charged or VdcP and VdcN are discharged (ST8).
- steps ST7 and ST8 in order to control the balance of the DC voltage, there is a choice of lowering the switching leg voltage on the higher voltage side and raising the switching leg voltage on the lower voltage side. In this case, the selection is made according to the polarity of the phase current at that time. This will be described with reference to FIGS.
- FIG. 10 shows an example of transition in step ST7 when the output voltage level transitions from + 2E to + E and the voltage difference of the DC voltage is greater than or equal to the threshold and VDC3 ⁇ Vdc5x.
- the phase current when the phase current is positive, the DC charge on the 5-level inverter side is discharged by shifting the leg output of the 3-level inverter, that is, the output of the 3-level inverter from + E to 0, and conversely, the phase current is negative.
- the DC charge on the 3-level inverter side is charged by shifting the inner leg output of the 5i route, that is, the 5-level inverter from + E to 0.
- FIG. 11 shows a transition example of step ST8 when the output voltage level transitions from + 2E to + E, when the voltage difference of the DC voltage is equal to or greater than the threshold and VDC3> Vdc5x.
- the phase current is positive
- the 5i route that is, the inner leg output of the 5-level inverter is changed from + E to 0 to discharge the DC charge on the 3-level inverter side, and the phase current is reversed.
- the DC output on the 5-level inverter side is charged by changing the leg output of the 3-level inverter, that is, the leg output of the 3-level inverter from + E to 0.
- the current state is determined by the operation of the state transition device 84 described above, and the state signals A_sts of the 5-level inverter positive side switching leg, B_sts of the negative side switching leg, and C_sts of the U-phase switching leg of the 3-level inverter are obtained. These signals are supplied to the dead time conduction state determiner 87.
- the dead time conduction state determiner 87 as shown in FIG. 12, when the on / off state of each switching element changes, an OFF period is provided as a dead time period.
- the gate signal Gate-u of the 5-level inverter is obtained from A_sts and B_sts given the dead time period, and the gate signal Gate-U of the 3-level inverter is obtained from C_sts.
- Example of this invention was described, this Example is shown as an example and is not intending limiting the range of invention.
- the novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention.
- This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.
- the load of the 7-level inverter is not limited to the AC motor.
- the state transition device 84 the transition rule that reduces the difference in DC voltage between the 3-level inverter and the 5-level inverter has been described.
- the present invention is not limited to this, and the switching frequency of each switching leg should be equalized. Transition rules may be defined in
- the DC power sources of the 3-level inverter and the 5-level inverter are each indicated by a battery symbol, they may be DC power sources having a configuration obtained from AC via a converter circuit.
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Abstract
Description
PWM電圧レベルVu_LVは、状態遷移器84に与えられる。この状態遷移器84においては、与えられたPWM電圧レベルVu_LVを出力するための3相3レベルインバータ1のスイッチングレグ11U及び5レベルインバータ2Uの各スイッチング素子のスイッチング状態を順次決定する。状態遷移器84が各スイッチング素子のスイッチング状態を決定するための条件として、正側直流電圧VdcuP及び負側直流電圧VdcuNを平均値回路85Aで平均化したVDC5u、正側直流電圧VdcP及び負側直流電圧VdcNを平均値回路85Bで平均化したVDC3、及びU相電流Iuを正負判定回路86で正負判定した信号が状態遷移器84に与えられている。
2U、2V、2W 単相5レベルインバータ(5レベルインバータ)
3 交流電動機
4 主制御装置
5、5U、5V、5W 電圧検出器
6U、6W 電流検出器
7 電動機制御部
8U、8V、8W パルス幅制御部
10P 正側直流電源
10N 負側直流電源
11U、11V、11W スイッチングレグ
20UP 正側直流電源
20UN 負側直流電源
21UO 外側スイッチングレグ
21UI 内側スイッチングレグ
81 電圧補正部
82 三角波比較器
83 加算器
84 状態遷移器
85A、85B 平均値回路
86 正負判定回路
Claims (5)
- 3レベルの第1の直流電源の直流を交流に変換する3相3レベルインバータと、
各々第1の直流電源と同電圧を有する第2の3レベルの直流電源の直流を交流に変換し、その出力が前記3相3レベルインバータの各相の出力に直列に接続された3台の単相5レベルインバータと、
各相毎に、与えられた電圧基準をパルス幅制御して前記3レベルインバータの当該相と当該相の前記単相5レベルインバータを構成するスイッチング素子にゲートパルスを供給するパルス幅制御手段とを具備した7レベルインバータ装置であって、
前記パルス幅制御手段は、
前記電圧基準をパルス幅変調された当該相の電圧レベルに変換する手段と、
この電圧レベルの変遷に基づいて前記3レベルインバータの当該相のスイッチングレグの出力、前記単相5レベルインバータの外側及び内側のスイッチングレグの出力を決定する状態遷移手段と
を有し、
前記状態遷移手段は、
前記電圧レベルが正のときは、前記3レベルインバータの当該相のスイチングレグ、前記単相5レベルインバータの外側及び内側のスイッチングレグの3つの出力の何れもが0または正となるようにし、
前記電圧レベルが負のときは、前記3レベルインバータの当該相のスイッチングレグ、前記単相5レベルインバータの外側及び内側のスイッチングレグの3つの出力の何れもが0または負となるようにし、
前記電圧レベルが0のとき、前記3レベルインバータの当該相のスイッチングレグ、前記単相5レベルインバータの外側及び内側のスイッチングレグの3つの出力の何れもが0となるようにすることを特徴とする7レベルインバータ装置。 - 前記状態遷移手段は、
前記第1の直流電源と前記第2の直流電源の電圧差が所定の閾値以内で、且つ前記3レベルインバータの当該相のスイチングレグ、前記単相5レベルインバータの外側及び内側のスイッチングレグの3つの出力の組合せの選択肢が複数あるとき、
過去最も長時間スイッチングを行っていないスイチングレグをスイッチングする組合せを選択するようにしたことを特徴とする請求項1に記載の7レベルインバータ装置。 - 前記状態遷移手段は、
前記第1の直流電源と前記第2の直流電源の電圧差が所定の閾値を超え、且つ前記3レベルインバータの当該相のスイチングレグ、前記単相5レベルインバータの外側及び内側のスイッチングレグの3つの出力の組合せの選択肢が複数あるとき、
スイッチングによって前記電圧差が小さくなるような組合せを選択するようにしたことを特徴とする請求項1に記載の7レベルインバータ装置。 - 前記状態遷移手段は、
スイッチングによって前記電圧差が小さくなるような組合せが複数あるとき、当該相の電流が正であれば電圧の大きい方の直流電源の電荷が放電する組合せを選択し、当該相の電流が負であれば電圧の小さい方の直流電源に電荷を充電する組合せを選択するようにしたことを特徴とする請求項3に記載の7レベルインバータ装置。 - 負荷は交流電動機であることを特徴とする請求項1に記載の7レベルインバータ装置。
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JP2012085479A (ja) * | 2010-10-14 | 2012-04-26 | Toshiba Mitsubishi-Electric Industrial System Corp | 電力変換装置 |
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