JP2016208819A - 三相インバータのオフセット電圧生成装置及び三相インバータ制御装置 - Google Patents
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- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
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- 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
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- 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
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- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
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Abstract
【解決手段】三相インバータのオフセット電圧生成装置は、第1相電圧信号を最大制限値及び最小制限値と比較して第1制限電圧信号を出力する第1制限器、第2相電圧信号を最大制限値及び最小制限値と比較して第2制限電圧信号を出力する第2制限器、第3相電圧信号を最大制限値及び最小制限値と比較して第3制限電圧信号を出力する第3制限器、及び第1相電圧信号と第1制限電圧信号の差値、第2相電圧信号と第2制限電圧信号の差値、第3相電圧信号と第3制限電圧信号の差値を合算してオフセット電圧を出力する合算器を含み、最大制限値及び最小制限値は、予め定められた加重値及び三相インバータの直流端電圧により決定されることを特徴とする。
【選択図】図5
Description
また、本発明によると、不連続変調区間の調節を通して、変調指数の低い区間で従来の不連続変調方式に比べて全高調波ひずみ(THD)を減少させながら、従来の連続変調方式に比べてスイッチング損失を減少させることのできる長所がある。
図5を参照すると、本発明の一実施形態に係るオフセット電圧生成部402は、三相の相電圧信号V* as、V* bs、V* cs及びこれに対応する制限信号Vas、Vbs、Vcsを利用して、下記のような数式によりオフセット電圧V* snを生成する。
図6のグラフには、それぞれ第1相電圧信号603(a)、第2相電圧信号603(b)、第3相電圧信号603(c)をそれぞれ直流端電圧VDC/2に正規化させた波形が示されている。図6に示されたように、第1相電圧信号603(a)、第2相電圧信号603(b)、第3相電圧信号603(c)の最大値はMI、最小値は−MIとなる。
図6には、加重値kの可用範囲601が示されている。前述したように、加重値kが変調指数MIより小さいとき、不連続変調が始まる。仮に、加重値kと変調指数MIが同一であれば、PWM制御部104は、SPWM方式で動作することとなる。
PWM制御部104が不連続変調方式で動作するためには、図7に示されたように、変調指数MIに対する加重値kの傾きが1以下でなければならない(701)。特に、PWM制御部104が60゜DPWMで動作するとき、図7のように、変調指数MIに対する加重値kの傾きはSQ(3)/2となる。一方、図7において、MI_startは、PWM制御部104が不連続変調方式で動作を開始する不連続変調開始点703を意味する。
502(a): 第1制限器
502(b): 第2制限器
502(c): 第3制限器
603(a): 第1相電圧信号
603(b): 第2相電圧信号
603(c): 第3相電圧信号
a1: スイッチング素子
a2: スイッチング素子
b1: スイッチング素子
b2: スイッチング素子
c1: スイッチング素子
c2: スイッチング素子
Claims (10)
- 連続変調方式または不連続変調方式で動作する三相インバータのオフセット電圧生成装置において、
第1相電圧信号を最大制限値及び最小制限値と比較して第1制限電圧信号を出力する第1制限器;
第2相電圧信号を最大制限値及び最小制限値と比較して第2制限電圧信号を出力する第2制限器;
第3相電圧信号を最大制限値及び最小制限値と比較して第3制限電圧信号を出力する第3制限器;及び
前記第1相電圧信号と前記第1制限電圧信号の差値、前記第2相電圧信号と前記第2制限電圧信号の差値、前記第3相電圧信号と前記第3制限電圧信号の差値を合算してオフセット電圧を出力する合算器を含み、
前記最大制限値及び前記最小制限値は、
予め定められた加重値及び前記三相インバータの直流端電圧により決定される三相インバータのオフセット電圧生成装置。 - 前記第1制限器、前記第2制限器、前記第3制限器は、
前記第1相電圧信号、前記第2相電圧信号、前記第3相電圧信号が前記最小制限値以上であり、前記最大制限値以下である場合は、前記第1相電圧信号、前記第2相電圧信号、前記第3相電圧信号をそれぞれ前記第1制限電圧信号、前記第2制限電圧信号、前記第3制限電圧信号として出力し、
前記第1相電圧信号、前記第2相電圧信号、前記第3相電圧信号が前記最小制限値未満である場合は、前記最小制限値を前記第1制限電圧信号、前記第2制限電圧信号、前記第3制限電圧信号として出力し、
前記第1相電圧信号、前記第2相電圧信号、前記第3相電圧信号が前記最大制限値を超える場合は、前記最大制限値を前記第1制限電圧信号、前記第2制限電圧信号、前記第3制限電圧信号として出力する請求項1に記載の三相インバータのオフセット電圧生成装置。 - 前記第1相電圧信号、前記第2相電圧信号、前記第3相電圧信号が前記最小制限値以上であり、前記最大制限値以下である場合は、前記三相インバータは連続変調方式で動作し、
前記第1相電圧信号、前記第2相電圧信号、前記第3相電圧信号が前記最小制限値未満である場合、又は、前記最大制限値を超える場合は、前記三相インバータは不連続変調方式で動作する請求項1に記載の三相インバータのオフセット電圧生成装置。 - 前記加重値が予め決定された不連続動作範囲を満たすと、前記三相インバータは不連続変調方式で動作し、
前記加重値が前記不連続動作範囲を満たさないと、前記三相インバータは連続変調方式で動作する請求項1に記載の三相インバータのオフセット電圧生成装置。 - 三相インバータに含まれる複数のスイッチング素子のスイッチング動作を制御するための三相インバータ制御装置において、
第1相電圧信号、第2相電圧信号、第3相電圧信号をそれぞれ最大制限値及び最小制限値と比較してオフセット電圧を生成し、前記第1相電圧信号、前記第2相電圧信号、前記第3相電圧信号それぞれと前記オフセット電圧を合算して第1極電圧信号、第2極電圧信号、第3極電圧信号を生成する極電圧信号生成部;及び
前記第1極電圧信号、前記第2極電圧信号、前記第3極電圧信号を搬送波と比較して前記複数のスイッチング素子に対する制御信号を生成する制御信号生成部を含み、
前記最大制限値及び前記最小制限値は、
予め定められた加重値及び前記三相インバータの直流端電圧により決定される三相インバータ制御装置。 - 前記極電圧信号生成部は、
前記オフセット電圧を生成するオフセット電圧生成部を含み、
前記オフセット電圧生成部は、
前記第1相電圧信号を最大制限値及び最小制限値と比較して第1制限電圧信号を出力する第1制限器;
前記第2相電圧信号を最大制限値及び最小制限値と比較して第2制限電圧信号を出力する第2制限器;
前記第3相電圧信号を最大制限値及び最小制限値と比較して第3制限電圧信号を出力する第3制限器;及び
前記第1相電圧信号と前記第1制限電圧信号の差値、前記第2相電圧信号と前記第2制限電圧信号の差値、前記第3相電圧信号と前記第3制限電圧信号の差値を合算してオフセット電圧を出力する合算器を含む請求項6に記載の三相インバータ制御装置。 - 前記第1相電圧信号、前記第2相電圧信号、前記第3相電圧信号が前記最小制限値以上であり、前記最大制限値以下である場合は、前記三相インバータは連続変調方式で動作し、
前記第1相電圧信号、前記第2相電圧信号、前記第3相電圧信号が前記最小制限値未満である場合、又は、前記最大制限値を超える場合は、前記三相インバータは不連続変調方式で動作する請求項6に記載の三相インバータ制御装置。 - 前記加重値が予め決定された不連続動作範囲を満たすと、前記三相インバータは不連続変調方式で動作し、
前記加重値が前記不連続動作範囲を満たさないと、前記三相インバータは連続変調方式で動作する請求項6に記載の三相インバータ制御装置。
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