JP3682544B2 - Plant power rate control system using inverter drive device - Google Patents

Plant power rate control system using inverter drive device Download PDF

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JP3682544B2
JP3682544B2 JP21849898A JP21849898A JP3682544B2 JP 3682544 B2 JP3682544 B2 JP 3682544B2 JP 21849898 A JP21849898 A JP 21849898A JP 21849898 A JP21849898 A JP 21849898A JP 3682544 B2 JP3682544 B2 JP 3682544B2
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inverter drive
power
converter
drive device
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JP2000037082A (en
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昇 梓沢
繁 椙山
河野　　行弘
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Hitachi Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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Description

【０００１】
【発明の属する技術分野】
本発明は、ＩＧＢＴ、ＧＴＤ等自己消弧素子を用いた半導体ＰＷＭ順変換器・逆変換器からなるインバータドライブ装置に係り、特に、ＰＷＭ順変換器の余力変換機能を用いてプラント電源全体のカ率を制御するインバータドライブ装置によるプラント電源カ率制御方式に関する。
【０００２】
【従来の技術】
ＰＷＭコンバータ・インバータを用いたインバータドライブ装置は、「日立評論 １９９３年３月号 ｐｐ３７〜４０」に記載のように、ドライブ装置として、電源カ率を１．０に制御している。
従来のインバータドライブ装置の構成図を図６に示す。図６において、インバータドライブ装置６は、誘導電動機７の回転速度を直接制御するＩＧＢＴインバータ３０と、ＩＧＢＴインバータ３０の入力直流電圧を電源トランス５から供給される三相交流より直流に変換し、制御するＩＧＢＴコンバータ４０より構成される。ＩＧＢＴインバータ３０は、ＩＧＢＴコンバータ４０より供給される直流電源をもとに誘導電動機７の要求される回転速度に対応する交流電圧、周波数及び位相の三相交流に変換するＰＷＭインバータ主回路３１と、この主回路３１を介して速度制御を行なう速度制御装置３２とより構成される。速度制御装置３２は、誘導電動機７に直結されたパルスエンコーダ３３で検出される回転速度検出値Ｗｒと速度制御指令Ｗｒ*とより、誘導電動機７の磁束を制御するための励磁電流（ｄ軸成分電流）Ｉｄ*成分と発生トルクを制御するためのトルク電流（ｑ軸成分電流）Ｉｑ*成分とのベクトル演算により、誘導電動機７の磁束制御を含む速度制御演算を行ない、この演算結果のｄ軸、ｑ軸電流指令Ｉｄ*、Ｉｑ*に基づき、ｄ軸、ｑ軸電流制御を行なうとともに、すべり周波数ｆを演算し、すべり周波数演算結果と回転速度検出値ωｒより一次周波数指令値ω1*を演算する。一方、ｄ軸、ｑ軸電流指令Ｉｄ*、Ｉｑ*及び一次周波数指令値ω1*に基づき、ベクトル演算により三相交流電流制御を行ない、その演算結果である３相出力電圧指令に基づき、多重ＰＷＭ制御により演算されるＰＷＭパルスによりインバータ主回路３１を制御し、誘導電動機７の速度制御を行なう。
ＩＧＢＴコンバータ４０は、電源カ率を１．０に制御すると共に、ＩＧＢＴインバータ３０の入力電源となる直流電圧を一定に制御する交流−直流変換のＩＧＢＴコンバータ主回路２１とこの主回路２１を介して電源カ率１．０制御及び直流電圧を一定に制御するコンバータ制御部４２とより構成される。コンバータ制御部４２では、直流電圧指令Ｅｄ*にコンバータ２１の出力電圧Ｅｄが一致するように直流電圧制御部２５で有効電流指令であるｑ軸電流指令Ｉｑ*を演算する。このｑ軸電流指令Ｉｑ*とカ率１．０とするためのｄ軸電流指令Ｉｄ*４４を指令値として、ｑ軸及びｄ軸電流制御を電流制御部４３で演算するとともに、電流制御部４３では電源電圧、位相の検出器２７の信号を基準として、ｄ軸、ｑ軸のベクトル演算を行ない、三相交流電流制御を行ない、ＩＧＢＴコンバータ２１のＰＷＭパルスの基準となる三相交流電圧指令を演算する。この三相交流電圧指令に基づき、ＰＷＭ制御部でＰＷＭパルスを演算出力し、ＩＧＢＴコンバータ２１によって電流カ率を１．０、直流電圧Ｅｄを一定にする制御を行なう。
このようにインバータドライブ装置６は、単体として、電流カ率を１．０に制御し、誘導電動機７の速度制御を行なえる理想的なドライブ装置である。
しかし、図５に示すように、従来のプラント構成は、電源トランス１、遅れカ率負荷設備３−１〜３−ｎ用のトランス２−１〜２−ｎ、インバータドライブ装置６−１〜６−Ｎ用のトランス５−１〜５−Ｎ、電動機７−１〜７−Ｎ、プラント全体の無効電力を補償する無効電力補償設備４から構成され、インバータドライブ装置６−１〜６−Ｎとして図６のインバータドライブ装置６が使用されるが、一般に無効電力補償設備４は、進相コンデンサを数バンクの容量に分割して入切するため、遅れカ率負荷設備３の負荷変動により、プラント全体のカ率を常に一定に制御することが出来ず、プラント全体の電源カ率が変動し、電圧変動が発生する。これらの対策として、無効電力補償設備４として、無効電力を連続制御できる設備「負荷追従形無効電力補償装置」（ＳＶＣ）があるが、設備コストが高くなるという問題があるため、導入されてない。
【０００３】
【発明が解決しようとする課題】
従来においては、単体として、電流カ率を１．０に制御し、誘導電動機７の速度制御を行なえる理想的なインバータドライブ装置６を使用しても、プラント全体の電源カ率を連続制御するには、設備コストの高いＳＶＣ装置が必要となるという問題があり、また、進相コンデンサバンクの段階的投入では、負荷の変動に連続で追従できないため、プラント全体の電源カ率変動、電圧変動を発生するという問題があった。また、電力コストの点からも、カ率変動分だけ余分なコストがかかっていた。
【０００４】
本発明の課題は、プラントの中で大きな電力比率をもつＰＷＭコンバータの無効電流供給余力機能を最大限に活用し、プラント全体の電源カ率を最適に制御するインバータドライブ装置によるプラント電源カ率制御方式を提供することにある。
【０００５】
【課題を解決するための手段】
上記課題は、ＰＷＭコンバータので流せる最大定格電流とプラントで使用されるＰＷＭインバータを介して電動機に流れる有効電流に基づいて各インバータドライブ装置の前記コンバータの余力無効電流供給可能量を演算し、この演算結果に基づいて前記コンバータの最大定格までの範囲でカ率補償用無効電流を流し、プラント全体のカ率を連続制御することによって、解決される。
【０００６】
本発明は、プラントの中で大きな電力比率をもつ、インバータドライブ装置群のＰＷＭコンバータの無効電流制御機能を用いて、また、これらＰＷＭコンバータは常時最大負荷では運転されてないことを利用して、インバータドライブ装置のＰＷＭコンバータの余力無効電流供給機能を最大限に活用し、連続カ率制御可能なＳＶＣ装置の機能と同じように、プラント全体の電源カ率を負荷に追従して最適に制御することができる。また、独立したＳＶＣ装置を設置する必要がなくなるため、設備スペースを小さく、かつ、設備コストを低減することができる。
【０００７】
【発明の実施の形態】
以下、本発明の実施形態を図面を用いて説明する。
図１は、本発明の一実施形態による全体構成を示す。１は電源トランス、２−１〜２−ｎはトランス、３−１〜３−ｎは遅れカ率負荷設備、５−１〜５−Ｎはトランス、７−１〜７−Ｎは電動機、８−１〜８−ＮはＩＧＢＴＰＷＭコンバータ余力無効電流制御付インバータドライブ装置、９は全体カ率制御部、１０は無効電力検出器、１１は電圧検出器、１２は電流検出器を表わす。
電源の電圧検出器１１と電流検出器１２の信号より無効電力検出器１０により無効電力Ｑを検出し、全体カ率制御部９がその検出値によりプラント全体のカ率を最適とする無効電流指令ＩＱ*を演算し、インバータドライブ装置８−１〜８−Ｎに指令する。
【０００８】
インバータドライブ装置８の詳細を図２に示す。２０はＰＷＭコンバータ、２１はＰＷＭコンバータ変換部、２２はＰＷＭコンバータ制御部、２３は有効電流無効電流を独立制御するｄ、ｑ軸電流制御部、２４はＰＷＭコンバータの余力無効電流指令の最大値を制限制御するｉｄ*最大値制限制御部、２５は直流電圧制御部、２６は図１の全体カ率制御部９からの無効電流指令ＩＱ*、２７はｄ、ｑ軸電流制御部２３の基準位相検出のための電圧検出器、２８は電流検出器、３０はＩＧＢＴＰＷＭインバータ、３１はＰＷＭインバータ変換部、３２はＰＷＭインバータのドライブ制御部である。
【０００９】
ｉｄ*最大値制限制御部２４の詳細を図３に示す。５１はＰＷＭコンバータ２０のｄ、ｑ軸電流ｉｄ、ｉｑのベクトル加算電流である一次電流Ｉ1の最大定格値Ｉ1ｍａｘ（ＰＷＭコンバータ２０が流せる最大定格値）、５２は電動機負荷で決まるｑ軸電流ｉｑ（有効電流）、５３はコンバータ定格で決まるＩ1ｍａｘと電動機負荷で決まるｉｑとより、ＰＷＭコンバータの余力無効電流分ｉｄｍａｘ＝√（Ｉ1ｍａｘ）2−（ｉｑ）2を演算する演算部、５４は無効電流指令ＩＱ*に対してｉｄｍａｘを最大値に制限する制御部である。
【００１０】
図４に全体カ率制御部９の構成図を示す。１０１はプラント全体で要求される無効電力指令Ｑ*であり、プラント全体の電源カ率を１．０に制御する場合は“０”となる。１０２は減算器であり、無効電力指令Ｑ*と無効電力検出器１０より検出される検出値Ｑとの偏差を演算する。１０３は無効電力制御部であり、減算器１０２の演算結果を入力し、減算器１０２の偏差がなくなるように、すなわち、無効電力指令値Ｑ*にプラント全体の無効電力を補正するための無効電流指令ＩＱ*を演算し、その演算結果はインバータドライブ装置８−１〜８−Ｎに指令する。
【００１１】
次に、本実施形態の動作を説明する。ＰＷＭインバータのドライブ制御部３２の動作は従来例と同じであるので、省略し、ＰＷＭコンバータ制御部２２について説明する。
ＰＷＭコンバータ制御部２２では、直流電圧指令Ｅｄ*にコンバータ２１の出力電圧Ｅｄが一致するように直流電圧制御部２５で有効電流指令であるｑ軸電流指令Ｉｑ*を演算する。一方、全体カ率制御部９においてプラント全体の電源カ率を最適とするために演算された無効電流指令ＩＱ*は、各インバータドライブ装置８−１〜８−ＮのＰＷＭコンバータ制御部２２の図３に示すｉｄ*最大値制限制御部２４に入力され、この制御部２４では、余力無効電流分演算部５３においてＰＷＭコンバータ２０の一次電流Ｉ1の最大定格値Ｉ1ｍａｘ５１と電動機負荷で決まるｑ軸電流ｉｑ５２に基づいて各々のＰＷＭコンバータの余力無効電流分ｉｄｍａｘを演算し、この余力無効電流ｉｄｍａｘの制限範囲内で無効電流指令ｉｄ*をｄ、ｑ軸電流制御部２３に出力する。
ここで、無効電力制御部１０３の演算結果の無効電流指令値ＩＱ*は、Ｎ台のインバータドライブ装置で全体を補正するため、Ｎ台の各々の余力無効電流分Ｉｄｍａｘの最大値以下の値となる。例えば、各インバータドライブ装置の余力無効電流分Ｉｄｍａｘが８−１が０．５ＰＵ、８−２が０．４ＰＵ、８−３が０．３ＰＵ、８−４〜８−Ｎが０ＰＵで、全体の必要無効電流が１．０ＰＵの運転状態の場合、ＩＱ*は０．４ＰＵとなり、全体の必要無効電流が１．０ＰＵのうち、８−３は余力無効電流分の０．３ＰＵを分担、８−２も余力無効電流分の０．４ＰＵを分担し、８−１は余力無効電流分０．５ＰＵのうち０．４ＰＵを分担するように制御される。これは、図３のｉｄｍａｘ最大値制限制御部５４により、余力無効電流分の少ないインバータドライブ装置から余力無効電流分を分担する作用があるためである。
また、無効電流指令ｉｄ*は、各々のＰＷＭコンバータの余力無効電流ｉｄｍａｘの制限範囲内の値であり、この余力無効電流ｉｄｍａｘの制限範囲内で全体カ率補償用無効電流を各々のＰＷＭコンバータより供給することになる。
ｄ、ｑ軸電流制御部２３では、ｑ軸電流指令Ｉｑ*とｄ軸電流指令Ｉｄ*を指令値とし、電源電圧、位相の検出器２７の信号を基準として、ｄ軸、ｑ軸のベクトル演算を行ない、ＩＧＢＴコンバータ２１の一次電流指令Ｉ1*を出力する。この一次電流指令Ｉ1*と電流検出器２８の信号に基づいて三相交流電流制御を行ない、ＩＧＢＴコンバータ２１のＰＷＭパルスの基準となる三相交流電圧指令を演算し、この三相交流電圧指令に基づき、ＰＷＭ制御部でＰＷＭパルスを演算出力し、ＩＧＢＴコンバータ２１によってプラント全体の電源カ率を負荷に追従して最適に制御する。
本実施形態では、各々のＰＷＭコンバータの余力無効電流ｉｄｍａｘの制限範囲内で全体カ率補償用無効電流を各々のＰＷＭコンバータより供給することにより、プラント全体の電力のうち大きな比率をもつインバータドライブ装置群のＰＷＭコンバータの余力無効電流供給能力を負荷追従形無効電力補償装置（ＳＶＣ）の代わりに活用することにより、別に設備を設置することなく、プラント全体の電源カ率を負荷に追従して最適に制御することができる。
【００１２】
なお、本発明は、各インバータドライブ装置の負荷状態をドライブ装置の上位制御装置により監視し、各インバータドライブ装置の余力無効電流供給能力を上位制御装置で演算し、各インバータドライブ装置に無効電流指令を分配するようにしても実施可能である。
また、図２の実施形態ではＩＧＢＴＰＷＭインバータを用いたが、本発明は、ＧＴＱ、ＩＧＣＴ等他の自己消弧素子を用いたＰＷＭ変換器でも同じ効果が得られる。
また、本発明は、プラント全体の構成より、インバータドライブ装置のＰＷＭコンバータの容量をインバータ部に比べて大きく設定する等により最適化を図れるという機能も付加することができる。
【００１３】
【発明の効果】
以上説明したように、本発明によれば、インバータドライブ装置として、もともと持つているＰＷＭコンバータの余力無効電流供給能力を最大限に活用するので、負荷追従形無効電力補償（ＳＶＣ）装置の機能と同じように、プラント全体の電源カ率を負荷に追従して最適に制御することができる。
また、独立したＳＶＣ装置を設置する必要がなくなるため、設備スペースを小さく、かつ、設備コストを低減することができる。
【図面の簡単な説明】
【図１】本発明の一実施形態による全体構成図
【図２】本発明のインバータドライブ装置の詳細図
【図３】本発明のＩｄ*最大値制限制御部の詳細図
【図４】本発明の全体カ率制御部の構成図
【図５】従来例の全体構成図
【図６】従来例のインバータドライブ装置
【符号の説明】
１…電源トランス、２−１〜２−ｎ…トランス、３−１〜３−ｎ…遅れカ率負荷設備、５−１〜５−Ｎ…トランス、７−１〜７−Ｎ…電動機、８−１〜８−Ｎ…ＩＧＢＴＰＷＭコンバータ余力無効電流制御付インバータドライブ装置、９…全体カ率制御部、１０…無効電力検出器、１１…電圧検出器、１２…電流検出器、２０…ＰＷＭコンバータ、２１…ＰＷＭコンバータ変換部、２２…ＰＷＭコンバータ制御部、２３…ｄ、ｑ軸電流制御部、２４…ｉｄ*最大値制限制御部、２５…直流電圧制御部、２６…無効電流指令ＩＱ*、２７…電圧検出器、２８…電流検出器、３０…ＩＧＢＴＰＷＭインバータ、３１…ＰＷＭインバータ変換部、３２…ＰＷＭインバータのドライブ制御部、５３…ＰＷＭコンバータの余力無効電流分ｉｄｍａｘを演算する演算部、５４…ｉｄｍａｘを最大値に制限する制御部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inverter drive device composed of a semiconductor PWM forward converter and an inverse converter using self-extinguishing elements such as IGBTs and GTDs, and more particularly, to the capacity of the entire plant power supply using the remaining power conversion function of the PWM forward converter. The present invention relates to a plant power supply rate control system using an inverter drive device for controlling the rate.
[0002]
[Prior art]
As described in “Hitachi Review, March 1993, pp 37-40”, the inverter drive device using the PWM converter / inverter controls the power supply rate to 1.0 as a drive device.
A configuration diagram of a conventional inverter drive device is shown in FIG. In FIG. 6, the inverter drive device 6 converts the IGBT inverter 30 that directly controls the rotational speed of the induction motor 7, and converts the input DC voltage of the IGBT inverter 30 from the three-phase AC supplied from the power transformer 5 to DC. The IGBT converter 40 is configured. The IGBT inverter 30 is a PWM inverter main circuit 31 that converts AC voltage, frequency, and phase into three-phase AC corresponding to the required rotation speed of the induction motor 7 based on the DC power supplied from the IGBT converter 40; It is comprised from the speed control apparatus 32 which performs speed control via this main circuit 31. The speed control device 32 is an excitation current (d-axis component) for controlling the magnetic flux of the induction motor 7 based on the rotation speed detection value Wr detected by the pulse encoder 33 directly connected to the induction motor 7 and the speed control command Wr *. Current) Id * component and a torque current (q-axis component current) Iq * component for controlling the generated torque are used to perform speed control calculation including magnetic flux control of induction motor 7, and the d-axis of this calculation result Based on the q-axis current commands Id * and Iq *, the d-axis and q-axis currents are controlled, the slip frequency f is calculated, and the primary frequency command value ω 1 * is calculated from the slip frequency calculation result and the rotation speed detection value ωr. Calculate. On the other hand, based on the d-axis and q-axis current commands Id * and Iq * and the primary frequency command value ω 1 *, the three-phase AC current control is performed by vector calculation, and based on the three-phase output voltage command that is the calculation result, The inverter main circuit 31 is controlled by the PWM pulse calculated by the PWM control, and the speed control of the induction motor 7 is performed.
The IGBT converter 40 controls the power supply rate to 1.0, and also controls the DC voltage serving as the input power source of the IGBT inverter 30 to be constant, and the AC-DC conversion IGBT converter main circuit 21 and the main circuit 21. The power source power ratio is 1.0 control and the converter control unit 42 controls the DC voltage to be constant. In converter control unit 42, DC voltage control unit 25 calculates q-axis current command Iq *, which is an effective current command, so that output voltage Ed of converter 21 matches DC voltage command Ed *. The q-axis current command Iq * and the d-axis current command Id * 44 for setting the power ratio to 1.0 are used as command values, and the q-axis and d-axis current control is calculated by the current control unit 43, and the current control unit 43 Then, based on the signal of the power supply voltage and phase detector 27, vector calculation of the d-axis and q-axis is performed, three-phase AC current control is performed, and a three-phase AC voltage command serving as a reference for the PWM pulse of the IGBT converter 21 is provided. Calculate. Based on this three-phase AC voltage command, the PWM controller calculates and outputs a PWM pulse, and the IGBT converter 21 performs control to make the current ratio 1.0 and the DC voltage Ed constant.
Thus, the inverter drive device 6 is an ideal drive device that can control the current rate to 1.0 and control the speed of the induction motor 7 as a single unit.
However, as shown in FIG. 5, the conventional plant configuration includes a power transformer 1, transformers 2-1 to 2-n for delay rate load facilities 3-1 to 3-n, and inverter drive devices 6-1 to 6-6. -N transformers 5-1 to 5-N, electric motors 7-1 to 7-N, and reactive power compensation equipment 4 for compensating reactive power of the entire plant, as inverter drive devices 6-1 to 6-N Although the inverter drive device 6 of FIG. 6 is used, the reactive power compensation facility 4 generally divides the phase advance capacitor into several banks of capacity and turns it on and off. The overall power rate cannot always be controlled to be constant, the power rate of the entire plant fluctuates, and voltage fluctuations occur. As a countermeasure for these, there is a “load-following reactive power compensator” (SVC) capable of continuously controlling reactive power as reactive power compensation facility 4, but it has not been introduced because of the problem of increased equipment cost. .
[0003]
[Problems to be solved by the invention]
Conventionally, as a single unit, the power rate of the entire plant is continuously controlled even when an ideal inverter drive device 6 that can control the current rate to 1.0 and control the speed of the induction motor 7 is used. However, there is a problem that an SVC device with a high equipment cost is required. In addition, when a phase-advancing capacitor bank is gradually introduced, it is impossible to continuously follow load fluctuations. There was a problem that occurred. Also, from the viewpoint of power cost, an extra cost is required for the fluctuation of the power rate.
[0004]
An object of the present invention is to control a plant power supply rate by an inverter drive device that optimally controls a power supply rate of the entire plant by making the most of the reactive current supply surplus function of a PWM converter having a large power ratio in the plant. To provide a method.
[0005]
[Means for Solving the Problems]
The above problem is to calculate the remaining available current supply amount of the converter of each inverter drive device based on the maximum rated current that can be flowed by the PWM converter and the effective current that flows to the motor via the PWM inverter used in the plant, and this calculation This can be solved by flowing a reactive current for power ratio compensation in the range up to the maximum rating of the converter based on the result, and continuously controlling the power ratio of the entire plant.
[0006]
The present invention uses the reactive current control function of the PWM converter of the inverter drive device group having a large power ratio in the plant, and utilizes that these PWM converters are not always operated at the maximum load, Utilizes the remaining reactive current supply function of the PWM converter of the inverter drive device to the maximum, and controls the power rate of the entire plant following the load in the same way as the function of the SVC device capable of continuous power rate control. be able to. Moreover, since it is not necessary to install an independent SVC device, the equipment space can be reduced and the equipment cost can be reduced.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an overall configuration according to an embodiment of the present invention. 1 is a power transformer, 2-1 to 2-n are transformers, 3-1 to 3-n are delay rate load facilities, 5-1 to 5-N are transformers, 7-1 to 7-N are motors, 8 -1 to 8-N are inverter drive devices with IGBT PWM converter remaining power reactive current control, 9 is an overall power ratio control unit, 10 is a reactive power detector, 11 is a voltage detector, and 12 is a current detector.
Reactive power Q is detected by the reactive power detector 10 from the signals of the voltage detector 11 and the current detector 12 of the power source, and the total power rate control unit 9 optimizes the power rate of the entire plant based on the detected value. IQ * is calculated and commanded to the inverter drive devices 8-1 to 8-N.
[0008]
The details of the inverter drive device 8 are shown in FIG. 20 is a PWM converter, 21 is a PWM converter conversion unit, 22 is a PWM converter control unit, 23 is a d / q-axis current control unit that independently controls the active current reactive current, and 24 is a maximum value of the remaining reactive current command of the PWM converter. Id * maximum value limit control unit for limiting control, 25 is a DC voltage control unit, 26 is a reactive current command IQ * from the overall power rate control unit 9 of FIG. 1, 27 is a reference phase of d, q-axis current control unit 23 A voltage detector for detection, 28 is a current detector, 30 is an IGBT PWM inverter, 31 is a PWM inverter converter, and 32 is a drive controller of the PWM inverter.
[0009]
Details of the id * maximum value restriction control unit 24 are shown in FIG. 51 is the maximum rated value I 1 max (maximum rated value that the PWM converter 20 can flow) of the primary current I 1 that is a vector addition current of d, q-axis current id, and iq of the PWM converter 20, and 52 is the q-axis determined by the motor load. Current iq (active current), 53 is an arithmetic operation for calculating a remaining reactive current idmax = √ (I 1 max) 2 − (iq) 2 of the PWM converter from I 1 max determined by the converter rating and iq determined by the motor load. And 54 are control units that limit idmax to the maximum value for reactive current command IQ *.
[0010]
FIG. 4 shows a configuration diagram of the overall power rate control unit 9. Reference numeral 101 denotes a reactive power command Q * required for the entire plant, which is “0” when the power rate of the entire plant is controlled to 1.0. A subtractor 102 calculates a deviation between the reactive power command Q * and the detected value Q detected by the reactive power detector 10. Reference numeral 103 denotes a reactive power control unit which receives the calculation result of the subtractor 102 and eliminates the deviation of the subtractor 102, that is, the reactive current for correcting the reactive power of the entire plant to the reactive power command value Q *. The command IQ * is calculated, and the calculation result is commanded to the inverter drive devices 8-1 to 8-N.
[0011]
Next, the operation of this embodiment will be described. Since the operation of the drive control unit 32 of the PWM inverter is the same as that of the conventional example, the PWM converter control unit 22 will be described below.
In the PWM converter control unit 22, the DC voltage control unit 25 calculates a q-axis current command Iq * that is an effective current command so that the output voltage Ed of the converter 21 matches the DC voltage command Ed *. On the other hand, the reactive current command IQ * calculated for optimizing the power supply rate of the entire plant in the overall power rate control unit 9 is a diagram of the PWM converter control unit 22 of each inverter drive device 8-1 to 8-N. 3 is input to the id * maximum value limit control unit 24 shown in FIG. 3, in which the surplus reactive current component calculation unit 53 determines q based on the maximum rated value I 1 max 51 of the primary current I 1 of the PWM converter 20 and the motor load. Based on the shaft current iq52, the remaining reactive current idmax of each PWM converter is calculated, and the reactive current command id * is output to the d and q-axis current control unit 23 within the limit range of the remaining power reactive current idmax.
Here, the reactive current command value IQ * of the calculation result of the reactive power control unit 103 is a value equal to or smaller than the maximum value of the remaining reactive current component Idmax of each of the N units in order to correct the whole with N inverter drive devices. Become. For example, the remaining reactive current Idmax of each inverter drive device is 0.5 PU for 8-1, 0.4 PU for 8-2, 0.3 PU for 8-3, 0 PU for 8-4 to 8-N, When the required reactive current is 1.0 PU, IQ * is 0.4 PU. Of the total required reactive current of 1.0 PU, 8-3 shares 0.3 PU for the remaining reactive current, 2 also shares 0.4 PU for the surplus reactive current, and 8-1 is controlled to share 0.4 PU of the surplus reactive current 0.5 PU. This is because the idmax maximum value restriction control unit 54 in FIG. 3 has the function of sharing the remaining reactive current from the inverter drive device having a smaller remaining reactive current.
Further, the reactive current command id * is a value within the limit range of the remaining reactive current idmax of each PWM converter, and the total power ratio compensating reactive current is supplied from each PWM converter within the limited range of the remaining reactive current idmax. Will be supplied.
The d and q axis current control unit 23 uses the q axis current command Iq * and the d axis current command Id * as command values and uses the power supply voltage and phase detector 27 signals as a reference to calculate the d axis and q axis vectors. And the primary current command I 1 * of the IGBT converter 21 is output. Based on the primary current command I 1 * and the signal from the current detector 28, three-phase AC current control is performed, and a three-phase AC voltage command serving as a reference for the PWM pulse of the IGBT converter 21 is calculated. Based on the above, the PWM control unit calculates and outputs a PWM pulse, and the IGBT converter 21 optimally controls the power supply rate of the entire plant following the load.
In the present embodiment, an inverter drive device having a large proportion of the electric power of the entire plant by supplying the total power ratio compensating reactive current from each PWM converter within the limit range of the remaining reactive current idmax of each PWM converter. By utilizing the surplus reactive current supply capability of the group PWM converters instead of the load-following reactive power compensator (SVC), the power supply rate of the entire plant can be optimally tracked to the load without installing separate equipment. Can be controlled.
[0012]
In the present invention, the load state of each inverter drive device is monitored by the host controller of the drive device, the remaining reactive current supply capability of each inverter drive device is calculated by the host controller, and a reactive current command is sent to each inverter drive device. It is also possible to distribute the above.
Further, although the IGBT PWM inverter is used in the embodiment of FIG. 2, the present invention can achieve the same effect even in a PWM converter using other self-extinguishing elements such as GTQ and IGCT.
In addition, the present invention can add a function that can be optimized by setting the capacity of the PWM converter of the inverter drive device larger than that of the inverter unit, etc., compared to the configuration of the entire plant.
[0013]
【The invention's effect】
As described above, according to the present invention, since the remaining reactive current supply capability of the original PWM converter is utilized to the maximum extent as the inverter drive device, the function of the load following reactive power compensation (SVC) device is Similarly, the power supply rate of the entire plant can be optimally controlled following the load.
Moreover, since it is not necessary to install an independent SVC device, the equipment space can be reduced and the equipment cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram according to an embodiment of the present invention. FIG. 2 is a detailed diagram of an inverter drive device of the present invention. FIG. 3 is a detailed diagram of an Id * maximum value limit control unit of the present invention. FIG. 5 is a block diagram of an overall power ratio control unit of the conventional apparatus. FIG. 5 is an overall block diagram of a conventional example. FIG.
DESCRIPTION OF SYMBOLS 1 ... Power supply transformer, 2-1 to 2-n ... Transformer, 3-1 to 3-n ... Delay capacity load equipment, 5-1 to 5-N ... Transformer, 7-1 to 7-N ... Electric motor, 8 -1 to 8-N: IGBT PWM converter remaining power reactive current control inverter drive device, 9 ... Overall power ratio control unit, 10 ... Reactive power detector, 11 ... Voltage detector, 12 ... Current detector, 20 ... PWM converter, 21 ... PWM converter conversion unit, 22 ... PWM converter control unit, 23 ... d, q-axis current control unit, 24 ... id * maximum value limit control unit, 25 ... DC voltage control unit, 26 ... reactive current command IQ *, 27 ... Voltage detector, 28 ... Current detector, 30 ... IGBT PWM inverter, 31 ... PWM inverter conversion unit, 32 ... Drive control unit of PWM inverter, 53 ... Calculation of remaining capacity invalid current idmax of PWM converter That the arithmetic unit, a control unit for limiting a maximum value of 54 ... idmax

Claims (2)

有効電流と無効電流を独立に制御できる半導体ＰＷＭ順変換器と、該順変換器の直流出力に接続され、その出力を電源として、電動機の速度制御を行なう半導体ＰＷＭ逆変換器とから構成される複数のインバータドライブ装置と、プラント電源の無効電力を検出する検出器と、全体のカ率を最適とするために前記インバータドライブ装置にカ率補償用無効電流指令を指令する全体カ率制御部とからなり、
前記各インバータドライブ装置によって、前記順変換器で流せる最大定格電流とプラントで使用される前記逆変換器を介して電動機に流れる有効電流に基づいて前記各インバータドライブ装置の前記順変換器の余力無効電流供給可能量を演算し、この演算結果に基づいて前記順変換器の最大定格までの範囲でカ率補償用無効電流を流し、プラント全体のカ率を連続制御することを特徴とするインバータドライブ装置によるプラント電源カ率制御方式。A semiconductor PWM forward converter that can control the active current and the reactive current independently, and a semiconductor PWM reverse converter that is connected to the DC output of the forward converter and uses the output as a power source to control the speed of the motor. A plurality of inverter drive devices, a detector for detecting the reactive power of the plant power supply, and an overall power rate control unit for commanding a reactive current command for power compensation to the inverter drive device in order to optimize the overall power rate; Consists of
Based on the maximum rated current that can be flowed by the forward converter and the effective current that flows to the motor through the reverse converter used in the plant by each inverter drive apparatus, the remaining capacity of the forward converter of each inverter drive apparatus is invalidated An inverter drive characterized in that a current supplyable amount is calculated, a reactive current for power rate compensation is passed in a range up to the maximum rating of the forward converter based on a result of the calculation, and the power rate of the entire plant is continuously controlled. Plant power rate control system using equipment. 有効電流と無効電流を独立に制御できる半導体ＰＷＭ順変換器と、該順変換器の直流出力に接続され、その出力を電源として、電動機の速度制御を行なう半導体ＰＷＭ逆変換器とから構成される複数のインバータドライブ装置と、各インバータドライブ装置に運転パターンを指令する上位制御装置からなり、
前記上位制御装置によって、各インバータドライブ装置の負荷状態を検出し、前記順変換器で流せる最大定格電流とプラントで使用される前記逆変換器を介して電動機に流れる有効電流に基づいて前記各インバータドライブ装置の前記順変換器の余力無効電流供給可能量を演算し、この演算結果に基づいて前記順変換器の最大定格までの範囲でカ率補償用無効電流を流し、プラント全体のカ率を連続制御することを特徴とするインバータドライブ装置によるプラント電源カ率制御方式。A semiconductor PWM forward converter that can control the active current and the reactive current independently, and a semiconductor PWM reverse converter that is connected to the DC output of the forward converter and uses the output as a power source to control the speed of the motor. It consists of a plurality of inverter drive devices and a host control device that commands the operation pattern to each inverter drive device.
The host controller detects the load state of each inverter drive device, and based on the maximum rated current that can flow in the forward converter and the effective current that flows to the motor via the reverse converter used in the plant The amount of remaining reactive current that can be supplied to the forward converter of the drive device is calculated, and based on the calculation result, a reactive current for compensating the power ratio is supplied in the range up to the maximum rating of the forward converter, and the power ratio of the entire plant is calculated. A plant power rate control system using an inverter drive device, characterized by continuous control.
JP21849898A 1998-07-16 1998-07-16 Plant power rate control system using inverter drive device Expired - Lifetime JP3682544B2 (en)

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EP1637447A4 (en) * 2003-06-26 2017-05-24 Toshiba Mitsubishi-Electric Industrial Systems Corporation Electric motor drive system
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US7038329B1 (en) * 2004-11-04 2006-05-02 Utc Power, Llc Quality power from induction generator feeding variable speed motors
CN105119297A (en) * 2015-08-06 2015-12-02 广东明阳龙源电力电子有限公司 Method used for adaptive reactive power compensation of photovoltaic inverter
JP7125875B2 (en) * 2018-07-26 2022-08-25 株式会社日立製作所 Plant power control system and its control method
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