JP3314260B2 - Power conversion device control method and device - Google Patents
Power conversion device control method and deviceInfo
- Publication number
- JP3314260B2 JP3314260B2 JP05997495A JP5997495A JP3314260B2 JP 3314260 B2 JP3314260 B2 JP 3314260B2 JP 05997495 A JP05997495 A JP 05997495A JP 5997495 A JP5997495 A JP 5997495A JP 3314260 B2 JP3314260 B2 JP 3314260B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- power
- power converter
- control
- load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、自己消弧素子を用いた
交流−直流−交流の電力変換を行なう電力変換装置の制
御方法および装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method and apparatus for a power converter for performing AC-DC-AC power conversion using a self-extinguishing element.
【０００２】[0002]
【従来の技術】従来の自己消弧素子を用いた電力変換装
置（ＰＷＭＧＴＯ変換装置）は、図４に示すように、電
源１、第１のＰＷＭ電力変換器２、平滑コンデンサ３、
第２のＰＷＭ電力変換器４、誘導電動機５、速度検出用
エンコーダ６、電流検出器７、第１の電力変換器の制御
装置８、２重系のうちの常用Ａ系８Ａ、待機Ｂ系８Ｂ、
第２の電力変換器の制御装置９、２重系のうちのそれぞ
れ常用Ａ系９−１Ａと待機Ｂ系９−１Ｂ、直流電圧検出
器１０、第１の電力変換器のＡ系、Ｂ系の切替部２６、
第２の電力変換器のＡ系、Ｂ系の切替部２７、制御装置
常用Ａ系８Ａ、待機Ｂ系８Ｂの異常を判定する診断部２
８、制御装置常用Ａ系９−１Ａ、待機Ｂ系９−１Ｂの異
常を判定する診断部２９から構成される。この電力変換
装置において、第１の電力変換器と第２の電力変換器
は、公知例（日立評論ＶＯＬ７５、ＮＯ６、１９９３−
６、ＰＰ３１〜３４）にあるように、第１の電力変換器
側で電源側の力率を制御するとともに直流電圧を一定に
制御して、第２の電力変換器側で電動機の電流、発生ト
ルク及び速度制御を行なっている。すなわち、図４のよ
うに、第２の電力変換器の制御装置９（９−１Ａまたは
９−１Ｂ）により制御されて第２の電力変換器４で変換
される電力（電動機の速度制御に必要な電力）ＰIある
いはＰI’に応じて、等しい電力ＰO（＝ＰI）あるいは
ＰO’（＝ＰI’）を第１の電力変換器の制御装置８（８
−１Ａまたは８−１Ｂ）により制御される第１の電力変
換器２で電力変換する制御方法を用いている。ここで、
ＰI、ＰOは誘導電動機５から電源１に回生する電力、Ｐ
I’、ＰO’は電源１から誘導電動機５に供給する電力を
示す。しかし、この従来の制御方法では、図５に示すよ
うに、運転中の制御装置８Ａが異常となると、第１
の電力変換器４の電力変換を一時停止（ＰO＝０）し、
その間に第２の電力変換器４からの電力ＰIが変換さ
れ続け、平滑コンデンサ３が過充電され、過電圧となる
という問題がある。そのため、第２の電力変換器４を一
時停止し、待機中の制御装置８Ｂに切替後、再始動する
方法が採られている。このように、従来の制御方法は、
異常発生時に、両方の電力変換器を一時停止させること
になる。ところで、両方の電力変換器が一時停止する
と、直流電圧は両変換器の制御できない整流作用による
電圧となること、および第２の電力変換器４より制御し
ている誘導電動機の励磁成分電流（無効電力成分）も停
止されるため、電動機の磁束確立がくずれることにな
る。そのため、従来の制御方法では、制御切替後の再始
動時、直流電圧の確立および電動機の磁束確立の始動前
操作に時間を要するという欠点があった。2. Description of the Related Art As shown in FIG. 4, a conventional power converter (PWMGTO converter) using a self-extinguishing element includes a power supply 1, a first PWM power converter 2, a smoothing capacitor 3,
Second PWM power converter 4, induction motor 5, speed detection encoder 6, current detector 7, control device 8 for first power converter 8, regular A system 8A of duplex system, standby B system 8B ,
Control device 9 of second power converter, regular A system 9-1A and standby B system 9-1B of double system, DC voltage detector 10, A system and B system of first power converter Switching unit 26,
Diagnosis unit 2 for judging abnormalities of A-system and B-system switching unit 27 of the second power converter, control device regular A system 8A, and standby B system 8B
8. It is composed of a diagnosis unit 29 for judging an abnormality of the control device regular A system 9-1A and the standby B system 9-1B. In this power converter, the first power converter and the second power converter are known examples (Hitachi Review Vol. 75, NO6, 1993-).
6, PP31 to 34), the power factor on the power source side is controlled on the first power converter side and the DC voltage is controlled to be constant, and the current and generation of the motor are generated on the second power converter side. Performs torque and speed control. That is, as shown in FIG. 4, the electric power controlled by the control device 9 (9-1A or 9-1B) of the second power converter and converted by the second power converter 4 (necessary for the speed control of the motor). The same power P O (= P I ) or P O ′ (= P I ′) depending on P I or P I ′.
-1A or 8-1B) in which the first power converter 2 controls power conversion. here,
P I and P O are electric power regenerated from the induction motor 5 to the power supply 1, P
I ′ and P O ′ indicate electric power supplied from the power supply 1 to the induction motor 5. However, in this conventional control method, as shown in FIG. 5, when the operating control device 8A becomes abnormal,
Pause power conversion of the power converter 4 (P O = 0),
Meanwhile, there is a problem that the power P I from the second power converter 4 is continuously converted, and the smoothing capacitor 3 is overcharged and becomes overvoltage. For this reason, a method is adopted in which the second power converter 4 is temporarily stopped, switched to the standby control device 8B, and then restarted. Thus, the conventional control method is
When an abnormality occurs, both power converters are temporarily stopped. By the way, when both power converters are temporarily stopped, the DC voltage becomes a voltage due to the uncontrollable rectification of both converters, and the excitation component current of the induction motor controlled by the second power converter 4 (inactive) Since the power component is also stopped, the magnetic flux establishment of the motor is lost. For this reason, the conventional control method has a drawback that it takes time to start the DC voltage establishment and the magnetic flux establishment of the electric motor at the time of restart after the control switching.
【０００３】[0003]
【発明が解決しようとする課題】以上のように、従来の
制御方法においては、直流電圧を制御する第１の電力変
換器２側に異常が発生すると、第２の電力変換器４も直
流電圧の上昇抑制のため、停止しなければならない。そ
のため、制御装置８、９を２重系の構成としても、両変
換器が一時停止するため、切替後に、直流電圧および誘
導電動機の磁束確立等の始動操作が必要となり、運転継
続性上問題であった。また、第１の電力変換器２の異常
により、直流電圧の上昇が生じたとき、第２の電力変換
器４は、過充電電力を停止するのみの機能しかないた
め、直流電圧上昇を減少させる制御つまり過電圧抑制が
できない、という問題があった。また、第１の電力変換
器２が異常とならなくても、第２の電力変換器４の負荷
の急変が発生すると、第１の電力変換器２の電力変換遅
れにより、ＰI＞Ｐｏとなり、平滑コンデンサ３は過充
電し、過電圧となる。そのため、過電圧を所定レベル以
下にするため、平滑コンデンサの容量を大きくしなけれ
ばならない、という問題があった。As described above, according to the conventional control method, when an abnormality occurs on the side of the first power converter 2 for controlling the DC voltage, the second power converter 4 is also switched to the DC voltage. Must be stopped to suppress the rise of Therefore, even if the control devices 8 and 9 are configured as a double system, since both converters are temporarily stopped, a start operation such as establishment of a DC voltage and a magnetic flux of the induction motor is required after switching, which causes a problem in operation continuity. there were. Further, when the DC voltage rises due to the abnormality of the first power converter 2, the DC power rise is reduced because the second power converter 4 has only the function of stopping the overcharge power. There was a problem that control, that is, overvoltage suppression could not be performed. Further, even if the first power converter 2 does not become abnormal, if a sudden change in the load of the second power converter 4 occurs, P I > Po due to a delay in power conversion of the first power converter 2. , The smoothing capacitor 3 is overcharged and becomes overvoltage. Therefore, there is a problem that the capacity of the smoothing capacitor must be increased in order to reduce the overvoltage to a predetermined level or less.
【０００４】本発明の目的は、第１と第２の電力変換器
を有する電力変換装置において、第１の電力変換器側の
異常またはその制御装置の切替時、あるいは、負荷の急
変等によって直流電圧が上昇する時には、直流電圧の上
昇を抑制すると共に、負荷の運転継続を行なうに好適な
電力変換装置の制御方法および装置を提供することにあ
る。An object of the present invention is to provide a power converter having first and second power converters, which is used when a fault occurs on the side of the first power converter or when its control device is switched, or when a load suddenly changes. An object of the present invention is to provide a control method and apparatus of a power conversion device suitable for suppressing a rise in a DC voltage when a voltage rises and for continuing a load operation.
【０００５】[0005]
【課題を解決するための手段】上記目的は、第１の電力
変換器および第２の電力変換器からなる電力変換装置に
おいて、電源の交流を直流電圧に変換する第１の電力変
換器が異常となった場合に、該異常を検知し、異常信号
に基づいて電動機等の負荷の速度制御およびトルク制御
に必要な電力に変換する第２の電力交換器を直流電圧制
御する機能に切替えることによって、達成される。ま
た、第１の電力変換器の制御装置が２重系に構成される
場合、一方の制御装置から他方の制御装置に切替が必要
となったとき、切替信号に基づいて第２の電力変換器を
直流電圧を制御する電圧制御機能に切替え、第１の電力
変換器の制御装置の切替後、第２の電力変換器の制御機
能を元に戻すことによって、達成される。また、変換さ
れる直流電圧が所定値を超えたとき、過電圧状態として
検知し、過電圧レベル信号に基づいて第２の電力変換器
を直流電圧を制御する電圧制御機能に切替え、変換され
る直流電圧が所定値以下になったとき、第２の電力変換
器の制御機能を元に戻すことによって、達成される。ま
た、変換される直流電圧が所定の設定電圧以上となった
とき、第２の電力変換器の制御装置の制御機能として、
速度制御のための指令を直流電圧と前記設定電圧の偏差
によって補正し、この補正した指令に基づいて直流電圧
制御することによって、達成される。SUMMARY OF THE INVENTION It is an object of the present invention to provide a power converter comprising a first power converter and a second power converter, wherein the first power converter for converting AC of a power supply to DC voltage is abnormal. In this case, by detecting the abnormality and switching the second power exchanger that converts the electric power necessary for speed control and torque control of the load of the electric motor or the like based on the abnormality signal to a function of performing DC voltage control, Is achieved. Further, when the control device of the first power converter is configured as a dual system, when it is necessary to switch from one control device to the other control device, the second power converter is switched based on the switching signal. By switching the control function of the first power converter and then returning the control function of the second power converter after switching the control device of the first power converter. Further, when the converted DC voltage exceeds a predetermined value, it is detected as an overvoltage state, and based on the overvoltage level signal, the second power converter is switched to a voltage control function of controlling the DC voltage, and the converted DC voltage is controlled. Is achieved by restoring the control function of the second power converter when is less than or equal to a predetermined value. When the DC voltage to be converted is equal to or higher than a predetermined set voltage, the control function of the control device of the second power converter includes:
This is achieved by correcting a command for speed control by a deviation between the DC voltage and the set voltage, and performing DC voltage control based on the corrected command.
【０００６】[0006]
【作用】本発明は、第１の電力変換器側の異常あるいは
制御装置の切替時において、第２の電力変換器を電圧制
御する機能で作動させ、直流電圧の上昇を抑制する。ま
た、負荷の急変により発生する直流電圧の変動を所定値
内に抑制し、平滑コンデンサの容量を大巾に低減する。
また、第１の電力変換器側の制御切替が発生しても、第
２の電力変換器で負荷の励磁電流を継続して制御し、磁
束を一定に及び直流電圧を所定内に保ち、制御切替によ
る異常回復後に第２の電力変換器を元の制御に戻し、負
荷の運転継続を行う。According to the present invention, when an abnormality occurs on the first power converter side or when the control device is switched, the second power converter is operated with a voltage control function to suppress a rise in DC voltage. Further, the fluctuation of the DC voltage generated by the sudden change of the load is suppressed within a predetermined value, and the capacity of the smoothing capacitor is greatly reduced.
Further, even when the control switching on the first power converter side occurs, the exciting current of the load is continuously controlled by the second power converter, the magnetic flux is kept constant, and the DC voltage is kept within a predetermined range. After the recovery from the abnormality by the switching, the second power converter is returned to the original control, and the operation of the load is continued.
【０００７】[0007]
【実施例】以下、本発明の実施例を図面を用いて説明す
る。図１は、本発明の一実施例を示すＧＴＯ素子を用い
たＰＷＭ電力変換装置のブロック図である。１は電源、
２は第１の電力変換器、３は平滑コンデンサ、４は第２
の電力変換器、５は誘導電動機、６は速度を検出する速
度検出器（エンコーダ）、７Ａおよび７Ｂは第１、第２
の電力変換器２、４の交流側電流をそれぞれ検出する電
流検出器、８は第１の電力変換器の制御装置、２６、２
７は後述するＡ系とＢ系とを切替える切替部、９は第２
の電力変換器の制御装置、１０は直流電圧検出器、２８
は後述する常用Ａ系制御装置８Ａ、待機Ｂ系制御装置８
Ｂの異常を診断する診断部、２９は後述する常用Ａ系制
御装置９Ａ、待機Ｂ系制御装置９Ｂの異常を診断する診
断部を示す。第１の電力変換器の制御装置８は、２重系
構成のうちの常用Ａ系制御装置８Ａと待機Ｂ系制御装置
８Ｂからなり、直流電圧検出器１０で検出される直流電
圧が一定になるように制御する機能を主とする制御装置
である。第２の電力変換器の制御装置９は、２重系構成
のうちの常用Ａ系制御装置９Ａと待機Ｂ系制御装置９Ｂ
からなり、速度検出器６および電流検出器７Ｂの検出信
号により、電動機５の発生トルクを制御し、速度を制御
する機能を主とする制御装置であると共に、第１の電力
変換器２側が異常の場合、直流電圧を電圧検出器１０の
信号により所定値内に抑制する電圧制御機能を有する制
御装置である。本実施例において、図４の従来例と異な
るところは、電圧検出器１０で検出した直流電圧を常用
Ａ系制御装置９Ａと待機Ｂ系制御装置９Ｂに入力し、ま
た、第１の電力変換器２側が異常のとき、診断部２８の
異常信号を常用Ａ系制御装置９Ａと待機Ｂ系制御装置９
Ｂに伝送する点である。本実施例の動作は、通常時では
図４の従来例と同様であり、制御装置９Ａ（または９
Ｂ）は速度検出器６からの電動機５の速度信号と電流検
出器７Ｂからの電流信号を入力して、速度制御する機能
により第２の電力変換器４を制御している。ところで、
第１の電力変換器２側に異常が発生すると、診断部２８
が異常を検知し、異常信号を制御装置９Ａ（および９
Ｂ）に伝送する。制御装置９Ａ（および９Ｂ）は、速度
制御する機能から直流電圧を制御する電圧制御機能に切
替えて、第２の電力変換器４を制御する。これにより、
直流電圧の上昇を抑制する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a PWM power converter using a GTO element according to an embodiment of the present invention. 1 is power supply,
2 is a first power converter, 3 is a smoothing capacitor, 4 is a second power converter.
Power converter, 5 is an induction motor, 6 is a speed detector (encoder) for detecting speed, 7A and 7B are first and second
Current detectors for detecting the AC side currents of the power converters 2 and 4 of the first power converter, respectively; 8 is a control device of the first power converter;
Reference numeral 7 denotes a switching unit for switching between A system and B system, which will be described later.
The control device of the power converter of 10 is a DC voltage detector, 28
Are the common A-system control device 8A and the standby B-system control device 8 to be described later.
A diagnostic unit 29 for diagnosing an abnormality of B is a diagnostic unit for diagnosing an abnormality of a regular A-system controller 9A and a standby B-system controller 9B, which will be described later. The control device 8 of the first power converter includes a normal A-system control device 8A and a standby B-system control device 8B in the dual system configuration, and the DC voltage detected by the DC voltage detector 10 becomes constant. Is a control device mainly having a function of performing control as described above. The control device 9 for the second power converter includes a normal A-system control device 9A and a standby B-system control device 9B in the dual system configuration.
The control device mainly has a function of controlling the generated torque of the electric motor 5 by the detection signals of the speed detector 6 and the current detector 7B and controlling the speed, and the first power converter 2 side is abnormal. In the case of (1), the control device has a voltage control function of suppressing the DC voltage within a predetermined value by the signal of the voltage detector 10. 4 is different from the conventional example of FIG. 4 in that a DC voltage detected by a voltage detector 10 is input to a service A system controller 9A and a standby B system controller 9B. When the second side is abnormal, the abnormality signal of the diagnosis unit 28 is transmitted to the regular A-system controller 9A and the standby B-system controller 9.
B. The operation of the present embodiment is normally the same as that of the conventional example of FIG.
B) receives the speed signal of the electric motor 5 from the speed detector 6 and the current signal from the current detector 7B, and controls the second power converter 4 by a speed control function. by the way,
When an abnormality occurs on the first power converter 2 side, the diagnosis unit 28
Detects an abnormality and sends an abnormality signal to the control device 9A (and 9).
B). Control device 9A (and 9B) controls second power converter 4 by switching from the function of controlling speed to the function of controlling DC voltage. This allows
Suppress DC voltage rise.
【０００８】図２に、図１に示す制御装置８、９の詳細
ブロックを示す。１〜１０は図１と同じであり、１１
Ａ、１１ＢはＰＷＭ制御部、１２Ａ、１２Ｂはｄ軸、ｑ
軸の２相より３相交流に変換する２相３相変換制御部、
１３Ａ、１３Ｂはｄ軸成分電流を制御するｄ軸電流制御
部、１４Ａ、１４Ｂはｑ軸成分電流を制御するｑ軸電流
制御部、１５Ａ、１５Ｂは電流検出器７Ａ、７Ｂで検出
する交流電流検出値より、ｄ軸、ｑ軸成分電流信号に変
換検出する電流成分検出部、１６Ａはｄ軸成分電流指令
部であり、第１の電力変換器２を力率１で運転する場合
には電流指令値Ｉｄ*を０とするような力率制御指令信
号である。１６Ｂはｄ軸成分電流指令部であり、誘導電
動機の励滋電流指令Ｉｍ*となる信号である。１８Ａ、
１８Ｂは電圧指令部、１７Ａ、１７Ｂは電圧指令部１８
Ａ、１８Ｂの電圧指令値Ｅｄ*、Ｅｄ2*に電圧検出器１
０の電圧がなるように制御する直流電圧制御部、１９は
速度検出部、２０は、速度検出部１９の速度信号ωｒと
ｑ軸電流指令Ｉｑ*とにより、電動機の速度、発生トル
クに対応する電動機に印加する電圧の周波数指令ω1*を
演算する一次周波数演算部、２３は速度指令部、２２は
速度指令部２３の指令値ωｒ*に電動機の速度が制御さ
れるようにトルク電流指令であるｑ軸電流指令Ｉｑ1*を
発生する速度制御部、２１は第１の電力変換器２側の正
常時には速度制御を選び、異常時には電圧制御を選ぶ速
度／電圧制御切替部である。２５Ａ、２５Ｂは異常検出
部である。本実施例において特徴とする構成は、直流電
圧制御部１７Ｂ、電圧指令部１８Ｂ、速度／電圧制御切
替部２１を設けた点にある。FIG. 2 shows a detailed block diagram of the control devices 8 and 9 shown in FIG. 1 to 10 are the same as FIG.
A and 11B are PWM controllers, 12A and 12B are d-axes, q
A two-phase / three-phase conversion control unit for converting two-phase shafts into three-phase AC;
13A and 13B are d-axis current controllers for controlling d-axis component currents, 14A and 14B are q-axis current controllers for controlling q-axis component currents, and 15A and 15B are AC current detections detected by current detectors 7A and 7B. A current component detection unit for converting and detecting the current value into d-axis and q-axis component current signals, and 16A a d-axis component current command unit. When the first power converter 2 is operated at a power factor of 1, a current command is issued. This is a power factor control command signal that sets the value Id * to 0. Reference numeral 16B denotes a d-axis component current command section, which is a signal serving as an excitation current command Im * for the induction motor. 18A,
18B is a voltage command section, and 17A and 17B are voltage command sections 18
A, 18B the voltage command value Ed *, Ed 2 * to the voltage detector 1
A DC voltage control unit for controlling the voltage to be 0, a speed detection unit 19, and a speed signal ωr of the speed detection unit 19 and a q-axis current command Iq * corresponding to the speed and generated torque of the motor. A primary frequency calculator for calculating a frequency command ω 1 * of a voltage applied to the motor, 23 is a speed command unit, and 22 is a torque current command such that the speed of the motor is controlled to a command value ωr * of the speed command unit 23. A speed control unit 21 that generates a certain q-axis current command Iq 1 * is a speed / voltage control switching unit that selects speed control when the first power converter 2 is normal and selects voltage control when abnormal. 25A and 25B are abnormality detection units. The feature of the present embodiment is that a DC voltage control unit 17B, a voltage command unit 18B, and a speed / voltage control switching unit 21 are provided.
【０００９】ここで、第１の電力変換器の制御装置８
は、第１の電力変換器２の直流側電圧（電圧検出器１０
の検出値Ｅｄ）が電圧指令値Ｅｄ*となるように直流電
圧制御部１７Ａで電圧制御し、有効成分電流であるｑ軸
電流指令Ιｑ*を出力し、ｑ軸電流制御部１４Ａで有効
成分電流指令であるΙｑ*となるようにｑ軸電流制御す
る。また、第１の電力変換器２の電源側力率を１．０に
制御するため、無効成分電流であるｄ軸電流Ｉｄを"０”
とするようにｄ軸電流制御部１３Ａでｄ軸電流制御す
る。そして、ｑ軸電流制御部１４Ａ、ｄ軸電流制御部１
３Ａの制御出力を２相３相変換制御部１２Ａでベクトル
演算し、２相３相変換制御を行ない、ＰＷＭ制御部１１
ＡでＰＷＭ制御信号を作成し、第１の電力変換器２を制
御する。第２の電力変換器の制御装置９は、通常時は、
電動機５の速度（速度検出器１９の検出値ωｒ）が速度
指令値ωｒ*となるように速度制御部２２で速度制御
し、電動機のトルク成分電流となるｑ軸電流指令Ιｑ1*
（通常はΙｑ*＝Ιｑ1*となる。）を出力し、ｑ軸電流
制御部１４Ｂでトルク成分電流指令であるΙｑ*となる
ようにｑ軸電流制御する。また、電動機５の励磁電流が
励磁電流指令値Ｉｍ*となるように励磁電流成分となる
ｄ軸電流制御をｄ軸電流制御部１３Ｂで行なう。そし
て、ｄ軸電流制御部１３Ｂ、ｑ軸電流制御部１４Ｂの制
御出力を２相３相変換制御部１２Ｂでベクトル演算し、
２相３相変換制御を行ない、ＰＷＭ制御部１１ＢでＰＷ
Ｍ制御信号を作成し、第２の電力変換器４を電動機５の
速度及び励磁電流の指令値となるように制御する。２相
３相変換制御部１２Ｂにおける演算は、一次周波数演算
部２０で演算する周波数指令ω1*が基準信号として使わ
れる。また、電流成分検出部１５Ａ、１５Ｂでは、第
１、第２の電力変換器のｑ軸、ｄ軸成分の電流検出を行
ない、ｑ軸、ｄ軸電流制御のフィードバック値を検出し
ている。一方、異常時は、異常検出部２５Ａが異常を検
出し、この異常信号により速度／電圧制御切替部２１が
速度制御部２２から直流電圧制御部１７Ｂに切替え、直
流電圧Ｅｄが第２の電圧指令値Ｅｄ2*となるように直流
電圧制御部１７Ｂで電圧制御し、ｑ軸電流指令Ｉｑ2*を
出力する。このＩｑ2*をトルク成分電流であるＩｑ1*の
代わり、電圧制御のための有効成分電流としてＩｑ2*を
トルク成分電流指令Ｉｑ*とし、ｑ軸電流制御する。こ
こで励磁電流成分となるＩｍ*は、無効成分電流であ
る。Here, the control device 8 of the first power converter
Is the DC side voltage of the first power converter 2 (the voltage detector 10
Is controlled by the DC voltage control unit 17A so that the detected value Ed) becomes the voltage command value Ed *, a q-axis current command Ιq *, which is an active component current, is output, and the active component current is output by the q-axis current control unit 14A. The q-axis current control is performed so that the command becomes Ιq *. Further, in order to control the power factor on the power supply side of the first power converter 2 to 1.0, the d-axis current Id, which is an ineffective component current, is set to “0”.
The d-axis current control is performed by the d-axis current control unit 13A such that The q-axis current controller 14A and the d-axis current controller 1
The two-phase / three-phase conversion control unit 12A performs vector operation on the control output of the 3A and performs two-phase / three-phase conversion control.
A generates a PWM control signal to control the first power converter 2. The control device 9 of the second power converter normally operates as follows:
The speed control section 22 controls the speed of the motor 5 so that the speed of the motor 5 (the detection value ωr of the speed detector 19) becomes the speed command value ωr *, and the q-axis current command Ιq 1 * which becomes the torque component current of the motor.
(Usually Ιq * = Ιq 1 * to become.) Outputs, to the q-axis current control such that the Iotaq * is a torque component current command in the q-axis current control unit 14B. Also, the d-axis current control unit 13B performs d-axis current control as an exciting current component so that the exciting current of the motor 5 becomes the exciting current command value Im *. Then, the control outputs of the d-axis current control unit 13B and the q-axis current control unit 14B are vector-calculated by the two-phase / three-phase conversion control unit 12B,
Two-phase three-phase conversion control is performed, and PWM control is performed by the PWM control unit 11B.
An M control signal is created, and the second power converter 4 is controlled so as to be a command value of the speed of the electric motor 5 and the exciting current. In the calculation in the two-phase / three-phase conversion control unit 12B, the frequency command ω 1 * calculated by the primary frequency calculation unit 20 is used as a reference signal. The current component detectors 15A and 15B detect the current of the q-axis and d-axis components of the first and second power converters, and detect the feedback values of the q-axis and d-axis current control. On the other hand, when an abnormality is detected, the abnormality detection unit 25A detects the abnormality, and the speed / voltage control switching unit 21 switches from the speed control unit 22 to the DC voltage control unit 17B in response to the abnormality signal, and the DC voltage Ed changes to the second voltage command. The voltage is controlled by the DC voltage controller 17B so that the value becomes Ed 2 *, and the q-axis current command Iq 2 * is output. The Iq 2 * the Iq 1 * instead of a torque component current, the Iq 2 * and torque component current command Iq * as the active component current for voltage control, q-axis current control. Here, Im *, which is the exciting current component, is a reactive component current.
【００１０】図３は、図１、図２に示す第１の電力変換
器２および第２の電力変換部４の詳細構成図である。３
０ＵＰ〜ＷＮはＧＴＯ素子、３１ＵＰ〜ＷＮはダイオー
ドであり、１（または５）は電源（または電動機）、３
は平滑コンデンサを示す。FIG. 3 is a detailed configuration diagram of the first power converter 2 and the second power converter 4 shown in FIG. 1 and FIG. 3
0UP to WN are GTO elements, 31UP to WN are diodes, 1 (or 5) is a power source (or motor), 3
Indicates a smoothing capacitor.
【００１１】図６を用いて、運転中の制御装置８Ａが異
常となり、待機系の制御装置８Ｂに切替える場合の動作
を説明する。制御装置８Ａに異常が発生すると、第
１の電力変換器を停止させるため、平滑コンデンサ３側
より電源１に回生されていた電力ＰOが０となる。’
第１の電力変換器を停止させると同時に、制御装置８Ａ
の異常信号が診断部２８を介して第２の電力変換器の制
御装置９Ａに伝送され、第２の電力変換器の制御装置９
Ａの機能を速度制御から電圧制御に切替える。すなわ
ち、図２において、制御装置８Ａの異常を検知した異常
検出部２５から異常信号が第２の電力変換器の制御装置
９Ａの速度／電圧制御切換部２１に伝送され、ｑ軸電流
指令Ｉｑ1*を発生する速度制御部２２から直流電圧制御
部１７Ｂに切替える。直流電圧制御部１７Ｂは、電圧検
出器１０で検出した直流電圧値Ｅｄが電圧指令値Ｅｄ*
に制御されるようにｑ軸電流指令Ｉｑ2*を出力する。
”第２の電力変換器４側は、制御装置９Ａが直流電圧
を制御する機能に切替えられるため、平滑コンデンサ３
を過充電しようとする平滑コンデンサ３側に入る電力Ｐ
Iを０に制御する。そのため、第１の電力変換器２が制
御装置８Ａから８Ｂに切替えられる一時的な停止時にお
いて、直流電圧の上昇を抑制する。また、この期間にお
いては、励磁電流を制御するｄ軸電流制御部系１６Ｂ、
１３Ｂは励磁電流が無効成分であるため、直流電圧の変
動はなく、継続して制御することにより、励磁電流を一
定に確保でき、電動機の磁束一定の運転が継続する。こ
れにより、制御装置８Ａから８Ｂに切替えた後、制御装
置９Ａを電圧制御から速度制御に切替え、第２の電力変
換器４の制御機能を元に戻したとき、直流電圧および磁
束が一定に確立しているので、スムーズな正常運転が再
開できる。Referring to FIG. 6, an operation when the control unit 8A during operation becomes abnormal and is switched to the standby control unit 8B will be described. When abnormality occurs in the controller 8A, for stopping the first power converter, the power P O is 0 which has been regenerated from the smoothing capacitor 3 side to the power supply 1. '
At the same time as stopping the first power converter, the control device 8A
Is transmitted to the control device 9A for the second power converter via the diagnosis unit 28, and the control device 9A for the second power converter
The function of A is switched from speed control to voltage control. That is, in FIG. 2, an abnormality signal is transmitted from the abnormality detection unit 25 that has detected the abnormality of the control device 8A to the speed / voltage control switching unit 21 of the control device 9A of the second power converter, and the q-axis current command Iq 1 Switch from the speed control unit 22 that generates * to the DC voltage control unit 17B. The DC voltage control unit 17B determines that the DC voltage value Ed detected by the voltage detector 10 is equal to the voltage command value Ed *.
To output the q-axis current command Iq 2 *.
"On the second power converter 4 side, since the control device 9A is switched to the function of controlling the DC voltage, the smoothing capacitor 3
P that enters the smoothing capacitor 3 to overcharge the battery
Control I to 0. Therefore, when the first power converter 2 is temporarily stopped when the control device is switched from the control device 8A to the control device 8B, an increase in the DC voltage is suppressed. Also, during this period, the d-axis current control unit system 16B for controlling the exciting current,
In 13B, since the exciting current is an ineffective component, the DC voltage does not fluctuate, and by controlling continuously, the exciting current can be kept constant and the operation of the motor with the constant magnetic flux continues. Thereby, after switching from the control device 8A to the control device 8B, the control device 9A is switched from the voltage control to the speed control, and when the control function of the second power converter 4 is returned to the original state, the DC voltage and the magnetic flux are established to be constant. As a result, smooth normal operation can be resumed.
【００１２】図７は、本発明の他の実施例を示す。１〜
２５は図２と同じである。図２と異なるところは、直流
電圧が第１の電力変換器２側の電圧指令値Ｅｄ*を超え
た所定の値以上になったとき、この電圧を検出する過電
圧検出器５０を設け、この過電圧検出器５０が検出した
過電圧レベル信号を第２の電力変換器の制御装置９Ａの
速度／電圧制御切換部２１に伝送し、ｑ軸電流指令Ｉｑ
1*を発生する速度制御部２２から直流電圧制御部１７Ｂ
に切替え、つまり速度制御から電圧制御に切替えること
にある。いま、制御装置８Ａに異常が発生すると、第１
の電力変換器を停止させるため、平滑コンデンサ３側よ
り電源１に回生されていた電力ＰOが０となる。一方、
第２の電力変換器４から平滑コンデンサ３に電力ＰIが
流入し、平滑コンデンサ３を過充電しようとする（図６
を参照）。過電圧検出器５０は、過電圧を検出し、直流
電圧が電圧指令値Ｅｄ*を超えた所定の値以上になった
とき、過電圧レベル信号を第２の電力変換器の制御装置
９Ａの速度／電圧制御切換部２１に伝送し、ｑ軸電流指
令Ｉｑ1*を発生する速度制御部２２から直流電圧制御部
１７Ｂに切替え、電圧検出器１０で検出した直流電圧値
Ｅｄが電圧指令値Ｅｄ*に制御されるようにｑ軸電流指
令Ｉｑ2*を出力する。以下、図６の動作で説明したよう
に、第２の電力変換器４側は、制御装置９Ａが直流電圧
を制御する機能に切替えられるため、平滑コンデンサ３
を過充電しようとする平滑コンデンサ３側に入る電力Ｐ
Iを抑制する。そのため、直流電圧が電圧指令値Ｅｄ*を
超えた所定値以上になったとき、直流電圧の上昇を抑制
する。また、この期間においては、励磁電流を制御する
ｄ軸電流制御部系１６Ｂ、１３Ｂは励磁電流が無効成分
であるため、直流電圧の変動はなく、継続して制御する
ことにより、励磁電流を一定に確保でき、電動機の磁束
一定の運転が継続する。これにより、制御装置８Ａから
８Ｂに切替えた後、直流電圧が電圧指令値Ｅｄ*を超え
た所定値以下に戻ると、制御装置９Ａを電圧制御から速
度制御に切替え、第２の電力変換器４の制御機能を元に
戻したとき、直流電圧および磁束が一定に確立している
ので、スムーズな正常運転が再開できる。FIG. 7 shows another embodiment of the present invention. 1 to
25 is the same as FIG. 2 is different from FIG. 2 in that an overvoltage detector 50 is provided to detect when the DC voltage exceeds a predetermined value exceeding a voltage command value Ed * on the first power converter 2 side. The overvoltage level signal detected by the detector 50 is transmitted to the speed / voltage control switching unit 21 of the control device 9A of the second power converter, and the q-axis current command Iq
1 * is generated from the speed control unit 22 to the DC voltage control unit 17B.
, That is, switching from speed control to voltage control. If an abnormality occurs in the control device 8A, the first
, The power P O regenerated from the smoothing capacitor 3 side to the power supply 1 becomes zero. on the other hand,
Power P I flows from the second power converter 4 into the smoothing capacitor 3 and attempts to overcharge the smoothing capacitor 3 (FIG. 6).
See). The overvoltage detector 50 detects the overvoltage, and when the DC voltage becomes equal to or more than a predetermined value exceeding the voltage command value Ed *, outputs the overvoltage level signal to the speed / voltage control of the control device 9A of the second power converter. The speed control unit 22 transmits the q-axis current command Iq 1 * to the switching unit 21 and switches to the DC voltage control unit 17B. The DC voltage value Ed detected by the voltage detector 10 is controlled to the voltage command value Ed *. To output the q-axis current command Iq 2 *. As described below with reference to the operation of FIG. 6, the second power converter 4 side is switched to the function of controlling the DC voltage by the control device 9A.
P that enters the smoothing capacitor 3 to overcharge the battery
Suppress I. Therefore, when the DC voltage is equal to or more than a predetermined value exceeding the voltage command value Ed *, an increase in the DC voltage is suppressed. Also, during this period, the d-axis current control systems 16B and 13B for controlling the exciting current do not change the DC voltage because the exciting current is an ineffective component, so that the exciting current is kept constant by controlling continuously. And the operation of the motor with constant magnetic flux is continued. Thereby, when the DC voltage returns to a predetermined value exceeding the voltage command value Ed * after switching from the control device 8A to 8B, the control device 9A is switched from voltage control to speed control, and the second power converter 4 When the control function is restored, the DC voltage and the magnetic flux are established at a constant level, so that smooth normal operation can be resumed.
【００１３】図８は、本発明の他の実施例を示す。１〜
２５は図２と同じである。図２と異なるところは、速度
／電圧制御切換部２１に替えて、直流電圧が所定レベル
以上になったとき、速度制御部２２が出力するｑ軸電流
指令Ιｑ1*を直流電圧制御部１７Ｂが出力するｑ軸電流
指令Ｉｑ2*によって補正する補正制御部２１Ｂを設け、
直流電圧を制御することにある。図９に、補正制御部２
１Ｂの詳細ブロックを示す。５１は直流電圧が電圧設定
値Ｅｄ2*以上でその偏差に比例した信号を出力し、電圧
設定値Ｅｄ2*以下では"０"を出力するリミッタ部、５２
は速度制御部２２の出力信号より直流電圧制御部１７Ｂ
の出力信号を優先させるための偏差増巾部、５３は減算
部である。本実施例では、第１の電力変換器２側が異常
とならなくても、第２の電力変換器４の負荷の急変が発
生すると、第２の電力変換器４から平滑コンデンサ３に
電力が流入し、平滑コンデンサ３を過充電しようとす
る。補正制御部２１Ｂは、速度制御部２２からｑ軸電流
指令Ιｑ1*と、直流電圧制御部１７Ｂからｑ軸電流指令
Ｉｑ2*を入力し、直流電圧が電圧設定値Ｅｄ2*以上にな
ったときはその偏差に比例した信号を偏差増巾部５２を
介してｑ軸電流指令Ιｑ1より優先させて出力し、減算
部５３でｑ軸電流指令Ιｑ1*から直流電圧と電圧設定値
Ｅｄ2*の偏差に比例した信号を減算して、つまりｑ軸電
流指令Ιｑ1*を補正して、電圧制御のための有効成分電
流としてＩｑ*を出力する。そのため、第２の電力変換
器４は、補正されたｑ軸電流指令Ｉｑ*に基づいて電圧
制御され、平滑コンデンサ３を過充電しようとする平滑
コンデンサ３側に入る電力を抑制する。負荷が通常状態
に戻り、リミッタ部５１において直流電圧が電圧設定値
Ｅｄ2*以下となると、ｑ軸電流指令Ｉｑ2*を"０"として
出力し、第２の電力変換器４の制御装置９の制御機能を
元に戻し、第２の電力変換器４は速度制御される。これ
により、負荷の急変等で発生する直流電圧の上昇を一定
値以下に制御することができ、平滑コンデンサの容量を
大巾に低減できる。また、図１０に示すように、リミッ
タ部５１の特性を上限リミッタ値Ｅｄ2、下限リミッタ
値Ｅｄ1として上下限リミッタ特性にすると、図９に示
した直流電圧を上昇抑制だけでなく、下降抑制機能も持
たせることができる。FIG. 8 shows another embodiment of the present invention. 1 to
25 is the same as FIG. The difference from FIG. 2 is that the DC voltage control unit 17B replaces the speed / voltage control switching unit 21 with the q-axis current command Ιq 1 * output by the speed control unit 22 when the DC voltage is equal to or higher than a predetermined level. A correction control unit 21B for correcting with the output q-axis current command Iq 2 * is provided,
The purpose is to control the DC voltage. FIG. 9 shows the correction control unit 2
1B shows a detailed block. 51 limiter portion a DC voltage to output a signal proportional to the deviation voltage set value Ed 2 * or more, the voltage setting value Ed 2 * The following outputs "0", 52
Is the DC voltage control unit 17B based on the output signal of the speed control unit 22.
Is a deviation amplifying section for giving priority to the output signal, and 53 is a subtraction section. In this embodiment, even if the first power converter 2 side does not become abnormal, when a sudden change in the load of the second power converter 4 occurs, power flows from the second power converter 4 to the smoothing capacitor 3. Then, an attempt is made to overcharge the smoothing capacitor 3. The correction control unit 21B receives the q-axis current command Ιq 1 * from the speed control unit 22 and the q-axis current command Iq 2 * from the DC voltage control unit 17B, and the DC voltage becomes equal to or higher than the voltage set value Ed 2 *. At this time, a signal proportional to the deviation is output via the deviation amplifier 52 with priority over the q-axis current command Ιq 1 , and the subtractor 53 outputs the DC voltage and the voltage set value Ed 2 from the q-axis current command Ιq 1 *. A signal proportional to the deviation of * is subtracted, that is, the q-axis current command Ιq 1 * is corrected, and Iq * is output as an effective component current for voltage control. Therefore, the second power converter 4 is voltage-controlled based on the corrected q-axis current command Iq *, and suppresses the power entering the smoothing capacitor 3 side where the smoothing capacitor 3 is to be overcharged. When the load returns to the normal state and the DC voltage in the limiter unit 51 becomes equal to or less than the voltage set value Ed 2 *, the q-axis current command Iq 2 * is output as “0”, and the control device 9 of the second power converter 4 Is restored, and the speed of the second power converter 4 is controlled. This makes it possible to control the rise of the DC voltage generated due to a sudden change in the load or the like to a certain value or less, and to greatly reduce the capacity of the smoothing capacitor. Further, as shown in FIG. 10, when the characteristics of the limiter unit 51 are set to the upper and lower limiter characteristics by setting the upper limiter value Ed 2 and the lower limiter value Ed 1 to the upper and lower limiter characteristics, the DC voltage shown in FIG. Functions can also be provided.
【００１４】なお、以上説明した実施例では、自己消弧
素子としてＧＴＯを用いた例を示したが、本発明は、Ｉ
ＧＢＴ、トランジスタ、ＩＧＣＴ、ＳＩサイリスタ等全
ての自己消弧素子を用いても、同じ制御方法で同じ効果
が得られる。また、以上説明した実施例では、第１の電
力変換器側の異常、あるいは、負荷の急変時に第１の電
力変換器の常用Ａ系制御装置８Ａから待機Ｂ系制御装置
８Ｂに切替える例を示したが、本発明は、通常のメンテ
ナンス等のため、常用Ａ系８Ａから待機Ｂ系８Ｂまたは
その逆の制御切替時においても適用できる。In the embodiment described above, an example is shown in which GTO is used as a self-extinguishing element.
Even if all self-extinguishing elements such as GBT, transistor, IGCT, and SI thyristor are used, the same effect can be obtained by the same control method. Further, in the embodiment described above, an example is shown in which, when an abnormality occurs on the first power converter side or when the load changes suddenly, the normal A-system controller 8A of the first power converter is switched to the standby B-system controller 8B. However, the present invention can also be applied when the control is switched from the regular A system 8A to the standby B system 8B or vice versa for normal maintenance or the like.
【００１５】[0015]
【発明の効果】以上説明したように、本発明によれば、
第１の電力変換器側の異常あるいは制御装置の切替時に
おいて、第２の電力変換器を電圧制御する機能で作動さ
せるので、直流電圧の上昇を抑制できる。また、負荷の
急変により発生する直流電圧の変動を所定値内に抑制す
るので、平滑コンデンサの容量を大巾に低減できる。ま
た、第１の電力変換器側の制御切替が発生しても、第２
の電力変換器で負荷の励磁電流を継続して制御するの
で、磁束を一定に保つこと及び直流電圧を所定内に保つ
ことができ、制御切替による異常回復後に第２の電力変
換器を元の制御に戻し、負荷の運転継続が行なえるとい
う効果がある。As described above, according to the present invention,
Since the second power converter is operated with the function of controlling the voltage when the first power converter is abnormal or when the control device is switched, the rise of the DC voltage can be suppressed. Further, since the fluctuation of the DC voltage generated by the sudden change of the load is suppressed within a predetermined value, the capacity of the smoothing capacitor can be greatly reduced. Further, even if the control switching on the first power converter side occurs, the second
Since the exciting current of the load is continuously controlled by the power converter, the magnetic flux can be kept constant and the DC voltage can be kept within a predetermined range. There is an effect that the control can be returned to continue the load operation.
【図１】本発明の一実施例を示すＧＴＯ素子を用いたＰ
ＷＭ電力変換装置のブロック図FIG. 1 shows a P using a GTO element according to an embodiment of the present invention.
Block diagram of WM power converter
【図２】図１に示す制御装置の詳細ブロック図FIG. 2 is a detailed block diagram of the control device shown in FIG.
【図３】電力変換器の構成図FIG. 3 is a configuration diagram of a power converter.
【図４】従来技術の説明図FIG. 4 is an explanatory view of a conventional technique.
【図５】従来技術の説明図FIG. 5 is an explanatory diagram of a conventional technique.
【図６】本発明の動作説明図FIG. 6 is a diagram illustrating the operation of the present invention.
【図７】本発明の他の実施例FIG. 7 shows another embodiment of the present invention.
【図８】本発明の他の実施例FIG. 8 shows another embodiment of the present invention.
【図９】図８の一部詳細ブロック図9 is a block diagram showing a part of FIG. 8 in detail.
【図１０】図９のリミッタ特性図FIG. 10 is a limiter characteristic diagram of FIG. 9;
１ 電源 ２、４ 電力変換器 ５ 誘導電動機 ８、９ 制御装置 ８Ａ、９Ａ 常用Ａ系制御装置 ８Ｂ、９Ｂ 待機Ｂ系制御装置 １０ 直流電圧検出器 ２８ 診断部 １７ 直流電圧制御部 １８ 電圧指令部 ２１ 速度／電圧制御切替部 ２１Ｂ 補正制御部 ２２ 速度制御部 ２３ 速度指令部 ２５ 異常検出部 ５０ 過電圧検出器 ５１ リミッタ部 Reference Signs List 1 power supply 2, 4 power converter 5 induction motor 8, 9 controller 8A, 9A service A controller 8B, 9B standby B controller 10 DC voltage detector 28 diagnostic unit 17 DC voltage controller 18 voltage command unit 21 Speed / voltage control switching unit 21B Correction control unit 22 Speed control unit 23 Speed command unit 25 Abnormality detection unit 50 Overvoltage detector 51 Limiter unit
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平５−344770（ＪＰ，Ａ) 実開 平５−4791（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H02M 7/757 H02P 7/63 H02P 21/00 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-5-344770 (JP, A) JP-A-5-4791 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) H02M 7/757 H02P 7/63 H02P 21/00
Claims (11)
等の負荷に電力を供給し、また、電動機等の負荷から電
源に電力を回生する第１の電力変換器および第２の電力
変換器からなる電力変換装置において、電源の交流を直
流電圧に変換する第１の電力変換器が異常となった場合
に、該異常を検知し、異常信号に基づいて電動機等の負
荷の速度制御およびトルク制御に必要な電力に変換する
第２の電力交換器を直流電圧制御する機能に切替え、直
流電圧の上昇を抑制することを特徴とする電力変換装置
の制御方法。1. A first power converter and a second power converter for supplying electric power from a power supply to a load such as an electric motor and regenerating electric power from the load such as an electric motor to the power supply using a self-extinguishing element. When the first power converter that converts the AC of the power supply to the DC voltage becomes abnormal, the abnormality is detected and the speed control of the load such as the electric motor is performed based on the abnormal signal. A control method for a power conversion device, comprising: switching a second power exchanger that converts electric power necessary for torque control to a function of controlling DC voltage, thereby suppressing an increase in DC voltage.
等の負荷に電力を供給し、また、電動機等の負荷から電
源に電力を回生する第１の電力変換器および第２の電力
変換器からなり、第１の電力変換器の制御装置を２重系
に構成する電力変換装置において、一方の制御装置から
他方の制御装置に切替が必要となった場合に、切替信号
に基づいて第２の電力変換器を電動機等の負荷の速度制
御およびトルク制御を行なう速度制御機能から直流電圧
を制御する電圧制御機能に切替え、第１の電力変換器の
制御装置の切替後、第２の電力変換器の制御機能を元に
戻し、負荷の運転を継続することを特徴とする電力変換
装置の制御方法。2. A first power converter and a second power converter for supplying power from a power supply to a load such as a motor and regenerating power from the load such as a motor to the power supply using a self-extinguishing element. In a power converter that includes a power converter and configures the control device of the first power converter in a dual system, if it is necessary to switch from one control device to the other control device, The second power converter is switched from a speed control function for controlling the speed and torque of a load such as a motor to a voltage control function for controlling a DC voltage, and after the control device of the first power converter is switched, the second power A control method for a power conversion device, comprising: returning a control function of a converter to continue a load operation.
等の負荷に電力を供給し、また、電動機等の負荷から電
源に電力を回生する第１の電力変換器および第２の電力
変換器からなる電力変換装置において、変換される直流
電圧が所定値を超えたとき、過電圧状態として検知し、
過電圧レベル信号に基づいて第２の電力変換器を電動機
等の負荷の速度制御およびトルク制御を行なう速度制御
機能から直流電圧を制御する電圧制御機能に切替え、直
流電圧の上昇を抑制することを特徴とする電力変換装置
の制御方法。3. A first power converter and a second power converter for supplying electric power from a power supply to a load such as an electric motor and regenerating electric power from the load such as an electric motor to the electric power supply by using a self-extinguishing element. In a power converter comprising a device, when the DC voltage to be converted exceeds a predetermined value, it is detected as an overvoltage state,
The second power converter is switched from a speed control function for performing speed control and torque control of a load such as a motor based on an overvoltage level signal to a voltage control function for controlling a DC voltage to suppress an increase in the DC voltage. A control method of the power converter.
が所定値以下になったとき、第２の電力変換器の制御機
能を元に戻し、負荷の運転継続を行なうことを特徴とす
る電力変換装置の制御方法。4. The power supply according to claim 3, wherein when the DC voltage to be converted becomes equal to or less than a predetermined value, the control function of the second power converter is returned to its original state and the operation of the load is continued. A control method for a conversion device.
等の負荷に電力を供給し、また、電動機等の負荷から電
源に電力を回生する第１の電力変換器および第２の電力
変換器からなる電力変換装置において、変換される直流
電圧が所定の設定電圧以上となったとき、第２の電力変
換器の制御装置の制御機能として、速度制御のための指
令を直流電圧と前記設定電圧の偏差によって補正し、こ
の補正した指令に基づいて直流電圧制御し、直流電圧の
上昇を抑制することを特徴とする電力変換装置の制御方
法。5. A first power converter and a second power converter for supplying electric power from a power supply to a load such as an electric motor and regenerating electric power from the load such as an electric motor to the power supply using a self-extinguishing element. When the DC voltage to be converted is equal to or higher than a predetermined set voltage, the control device of the second power converter controls a command for speed control with the DC voltage and the setting. A method for controlling a power conversion device, comprising: correcting by a voltage deviation, performing DC voltage control based on the corrected command, and suppressing an increase in DC voltage.
変換される直流電圧の上限と下限に定めることを特徴と
する電力変換装置の制御方法。6. The method according to claim 5, wherein the predetermined set voltage is:
A method for controlling a power converter, wherein the DC voltage to be converted is set to an upper limit and a lower limit.
て、第１の電力変換器は、その制御装置が２重系に構成
されることを特徴とする電力変換装置の制御方法。7. The control method for a power converter according to claim 3, wherein the control device of the first power converter is configured as a double system.
等の負荷に電力を供給し、また、電動機等の負荷から電
源に電力を回生する第１の電力変換器および第２の電力
変換器からなる電力変換装置において、第１の電力変換
器の制御装置に異常を検出する検出手段、第２の電力交
換器の制御装置に電動機等の負荷の速度制御およびトル
ク制御を行なう速度制御機能と変換される直流電圧を制
御する電圧制御機能とを切替える切替手段を設け、第１
の電力変換器の異常時に、第２の電力交換器の制御装置
の制御機能を電圧制御機能に切替えることを特徴とする
電力変換装置の制御装置。8. A first power converter and a second power converter that use a self-extinguishing element to supply power from a power supply to a load such as an electric motor and regenerate electric power from the load such as an electric motor to the power supply. Detection means for detecting an abnormality in a control device of a first power converter, and a speed control function for performing speed control and torque control of a load such as an electric motor in a control device of a second power exchanger. A switching means for switching between a voltage control function for controlling the DC voltage to be converted and
A control device for a power converter, wherein a control function of a control device of a second power exchanger is switched to a voltage control function when an abnormality of the power converter occurs.
等の負荷に電力を供給し、また、電動機等の負荷から電
源に電力を回生する第１の電力変換器および第２の電力
変換器からなる電力変換装置において、変換される直流
電圧が所定値を超えたとき、これを検出する手段と、第
２の電力交換器の制御装置に電動機等の負荷の速度制御
およびトルク制御を行なう速度制御機能と直流電圧を制
御する電圧制御機能とを切替える切替手段を設け、直流
電圧が所定値を超えたとき、第２の電力交換器の制御装
置の制御機能を電圧制御機能に切替えることを特徴とす
る電力変換装置の制御装置。9. A first power converter and a second power converter for supplying electric power from a power supply to a load such as an electric motor and regenerating electric power from the load such as an electric motor to the power supply using a self-extinguishing element. In a power converter comprising a heat exchanger, when a DC voltage to be converted exceeds a predetermined value, a means for detecting the DC voltage and a control device for the second power exchanger perform speed control and torque control of a load such as an electric motor. Switching means for switching between the speed control function and the voltage control function for controlling the DC voltage is provided, and when the DC voltage exceeds a predetermined value, the control function of the control device of the second power exchanger is switched to the voltage control function. A control device for a power converter.
１の電力変換器は、その制御装置が２重系に構成され、
切替手段は、一方の制御装置から他方の制御装置に切替
えた後に、第２の電力変換器の制御機能を元に戻すこと
を特徴とする電力変換装置の制御装置。10. The first power converter according to claim 8 or 9, wherein the control device of the first power converter has a double system,
The control device for a power conversion device, wherein the switching means restores the control function of the second power converter after switching from one control device to the other control device.
機等の負荷に電力を供給し、また、電動機等の負荷から
電源に電力を回生する第１の電力変換器および第２の電
力変換器からなる電力変換装置において、変換される直
流電圧が所定の設定電圧以上または所定の設定電圧以下
となったとき、速度制御のための指令を直流電圧と前記
設定電圧の偏差によって補正する手段を設け、第２の電
力変換器の制御装置の制御機能として、前記補正した指
令に基づいて直流電圧制御することを特徴とする電力変
換装置の制御装置。11. A first power converter and a second power converter for supplying electric power from a power supply to a load such as an electric motor and regenerating electric power from the load such as an electric motor to the electric power supply using a self-extinguishing element. Means for correcting a command for speed control by a deviation between the DC voltage and the set voltage when the DC voltage to be converted is equal to or higher than a predetermined set voltage or equal to or lower than a predetermined set voltage. A control device for a power conversion device, wherein the control device performs DC voltage control based on the corrected command as a control function of the control device for the second power converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05997495A JP3314260B2 (en) | 1995-02-23 | 1995-02-23 | Power conversion device control method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05997495A JP3314260B2 (en) | 1995-02-23 | 1995-02-23 | Power conversion device control method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08237963A JPH08237963A (en) | 1996-09-13 |
| JP3314260B2 true JP3314260B2 (en) | 2002-08-12 |
Family
ID=13128663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05997495A Expired - Fee Related JP3314260B2 (en) | 1995-02-23 | 1995-02-23 | Power conversion device control method and device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3314260B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4718041B2 (en) * | 2000-11-22 | 2011-07-06 | ダイキン工業株式会社 | Inverter control method and apparatus |
| JP4166669B2 (en) * | 2003-10-28 | 2008-10-15 | 三菱電機株式会社 | Vehicle power control device |
| JP6000558B2 (en) * | 2012-01-27 | 2016-09-28 | 住友重機械工業株式会社 | Injection molding machine and converter |
| AT512995A1 (en) | 2012-05-18 | 2013-12-15 | Fronius Int Gmbh | Method for controlling a current source, as well as current source and process controller therefor |
| JP6272077B2 (en) * | 2014-02-25 | 2018-01-31 | 三菱重工業株式会社 | Turbocharger and ship |
-
1995
- 1995-02-23 JP JP05997495A patent/JP3314260B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08237963A (en) | 1996-09-13 |
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