JP5943371B2 - Inverter power supply - Google Patents
Inverter power supply Download PDFInfo
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- JP5943371B2 JP5943371B2 JP2011162768A JP2011162768A JP5943371B2 JP 5943371 B2 JP5943371 B2 JP 5943371B2 JP 2011162768 A JP2011162768 A JP 2011162768A JP 2011162768 A JP2011162768 A JP 2011162768A JP 5943371 B2 JP5943371 B2 JP 5943371B2
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本発明は、交流フィルタとΔ-Y結線である変圧器を介して三相交流電圧を出力するインバータ電源装置に関するものである。 The present invention relates to an inverter power supply apparatus that outputs a three-phase AC voltage via a transformer that is an AC filter and a ΔY connection.
交流フィルタとΔ-Y結線である変圧器を介して三相交流電圧を出力するインバータ電源装置は一般的に、変圧器の偏磁と交流フィルタの共振を防ぐため、直流電流検出器（DCCT）及びカレントトランス（CT）によって回路中の電流値を検出し、その制御を行っている。 Inverter power supplies that output a three-phase AC voltage via a transformer that is connected to an AC filter and a Δ-Y connection generally use a DC current detector (DCCT) to prevent the transformer's bias and resonance of the AC filter. The current value in the circuit is detected and controlled by a current transformer (CT).
しかしながら、従来のDCCTとCTの構成のうち図２-aに示されるフィルタインダクタ部にDCCTを用い、変圧器二次側にCTを用いた構成の場合、誘導負荷等を投入したときに流れる過渡的な直流電流により変圧器二次側のCTが偏磁し実際の電流より小さい値が検出されることとなり、DCCTの検出値とCTの検出値の差が大きくなることで、制御系が、変圧器の偏磁が無い場合でも、変圧器の偏磁があると誤認して誤ったゲート信号を出し、変圧器を逆に偏磁させてしまうという問題がある。 However, when DCCT is used for the filter inductor part shown in Fig. 2-a and CT is used on the secondary side of the transformer among the conventional DCCT and CT configurations, the transient that flows when an inductive load is applied The CT on the secondary side of the transformer is demagnetized by a direct current and a value smaller than the actual current is detected, and the difference between the detected value of DCCT and the detected value of CT becomes large, so that the control system Even when the transformer is not demagnetized, there is a problem that the transformer is demagnetized by misrecognizing that there is a demagnetization of the transformer and reversely demagnetizing the transformer.
図２-bに示されるフィルタインダクタ部にDCCTを用い、フィルタコンデンサ部にCTを用いた構成の場合、CTに直流電流が流れることは無いが、CTが変圧器の一次側にあることにより、変圧器の励磁電流が検出できず、出力電圧に定常的な誤差が発生するという問題がある。 When DCCT is used for the filter inductor section shown in Fig. 2-b and CT is used for the filter capacitor section, no direct current flows through CT, but CT is on the primary side of the transformer. There is a problem that the excitation current of the transformer cannot be detected and a steady error occurs in the output voltage.
図２-cに示されるフィルタインダクタ部にDCCTを用い、変圧器二次側にもDCCTを用いた構成の場合、原理的には変圧器の偏磁や定常的な誤差は生じないが、DCCTは電源を必要とするため、制御系の電源を比較的長距離引き通すことになり、配線数の増加、制御電源の信頼性低下という問題があり、さらに、DCCTはCTと比べ複雑な構造をしているため、故障率が増加するという問題がある。 When DCCT is used for the filter inductor section shown in Fig. 2-c and DCCT is also used on the secondary side of the transformer, in principle, there will be no magnet bias or steady-state error. Requires a relatively long distance from the control system, which increases the number of wires and lowers the reliability of the control power supply. DCCT has a more complicated structure than CT. Therefore, there is a problem that the failure rate increases.
本発明は上記の課題を解決するために、フィルタインダクタ部にDCCTとCTを用い、変圧器二次側に各相の差分を取得するようにCTを用いる構成とし、交流フィルタ入力部のCTと変圧器二次側のCTを差動結線したものを検出値として制御に用いる。 In order to solve the above-mentioned problem, the present invention uses DCCT and CT in the filter inductor section, and uses CT so as to obtain the difference of each phase on the secondary side of the transformer. The differential secondary CT of the transformer secondary side is used for control as the detected value.
請求項１の発明によれば、三相インバータと、その三相インバータに接続されたフィルタインダクタおよびフィルタコンデンサにより構成される交流フィルタとその交流フィルタに接続されたΔ-Y結線である変圧器を備え、その変圧器を介して三相交流電圧を出力するインバータ電源装置において、さらに、交流フィルタに入力される電流を取得するよう接続された直流電流検出器と、フィルタインダクタ部の電流を取得するよう接続されたカレントトランスと、変圧器二次側の相電流の差分を取得するよう接続されたカレントトランスとを備え、交流フィルタに入力される電流と変圧器から出力される電流の差をフィルタインダクタ部の電流を取得するカレントトランスと変圧器二次側の相電流の差分を取得するよう接続されたカレントトランスとその差動結線によって検出し、その検出値によって三相インバータの制御をすることを特徴とするインバータ電源装置。
According to the first aspect of the present invention, there is provided an AC filter composed of a three-phase inverter, a filter inductor and a filter capacitor connected to the three-phase inverter, and a transformer that is a Δ-Y connection connected to the AC filter. An inverter power supply that outputs a three-phase AC voltage via the transformer , and further acquires a current of a filter inductor unit connected to acquire a current input to the AC filter and a filter inductor unit A current transformer connected to the transformer and a current transformer connected to obtain a difference between phase currents on the secondary side of the transformer, and filter the difference between the current input to the AC filter and the current output from the transformer. The current transformer connected to acquire the difference between the current transformer that acquires the current of the inductor section and the phase current of the transformer secondary side. Inverter power supply apparatus, wherein a three-phase inverter is controlled based on the detected value by detecting the current and the differential connection.
本発明には次のような効果がある。
１．過渡的な直流電流でCTが偏磁した場合でも、差動結線によりDCCTとではなくCTどうしで差分をとることと、変圧器二次側のCTでは各相の差分を取得するよう結線されていることでインダクタ部のCTと同等の偏磁となるため、検出値のオフセットが発生せず、変圧器の偏磁と誤認されない。
２．変圧器の一次側と二次側で差分をとるため変圧器の励磁電流を検出できる。
３．二次側にDCCTを用いていないため制御電源を引き通す必要が無く、また故障しにくい。
４．定常誤差が無く偏磁発生時でも誤った値を検出しないため制御ゲインを大きく取ることができ、システム全体の応答性を向上することができる。
The present invention has the following effects.
1. Even if the CT is demagnetized due to a transient DC current, the differential connection is used to obtain the difference between the CTs instead of the DCCT, and the transformer secondary side CT is connected to obtain the difference of each phase. As a result, the magnetism becomes equivalent to that of the CT of the inductor section, so that no offset of the detected value occurs and it is not mistaken for the magnetism of the transformer.
2. Since the difference is taken between the primary side and the secondary side of the transformer, the exciting current of the transformer can be detected.
3. Since DCCT is not used on the secondary side, it is not necessary to pass control power and it is difficult to break down.
4). Since there is no steady error and no erroneous value is detected even when a magnetic field is generated, a large control gain can be obtained, and the response of the entire system can be improved.
交流フィルタとΔ-Y結線である変圧器を介して三相交流電圧を出力するインバータ電源装置で、フィルタインダクタ部での各相を仮にR相、S相、T相、変圧器二次側の各相をU相、V相、W相とし、変圧器内部の構成はR-S相間の巻線がU相の巻線と、S-T相間の巻線がV相の巻線と、T-R相間の巻線がW相の巻線とそれぞれ磁気的に密に結合しているものとする。このときR相を流れる電流は、U相から正の向きで、W相から負の向きで影響を受けるため、U相とW相を逆向きにCTのコアに通すことでR相の位相と同様になり、変圧器の巻線とCTの感度を揃えることによって大きさを同等とすることができ、R相と差動結線するだけで交流フィルタ共振電流成分と変圧器励磁電流成分の和を検出できる。S相、T相についても同様に結線とCTの感度を揃えることで共振電流成分と励磁電流成分を検出できる。また、R相のCTの電流／磁気飽和特性とU相-W相のCTの電流／磁気飽和特性を変圧器の巻線比と揃えることで、CTに偏磁が発生した場合でも変圧器の偏磁とは誤認されず、制御ゲインの減少となって安全側に動作する。 It is an inverter power supply that outputs three-phase AC voltage via a transformer that is an AC filter and a Δ-Y connection. Temporarily, each phase in the filter inductor section is R-phase, S-phase, T-phase, transformer secondary side Each phase is U-phase, V-phase, W-phase, and the internal structure of the transformer is U-phase winding between RS phase, V-phase winding between ST phase and TR phase winding. Are magnetically coupled to the W-phase windings. At this time, the current flowing through the R phase is affected by the positive direction from the U phase and the negative direction from the W phase. Similarly, the size of the transformer winding and CT can be made equal by matching the sensitivity, and the sum of the AC filter resonance current component and the transformer excitation current component can be obtained simply by differentially connecting to the R phase. It can be detected. Similarly, for the S phase and T phase, the resonance current component and the excitation current component can be detected by matching the connection and CT sensitivities. Also, by aligning the current / magnetic saturation characteristics of the R-phase CT and the current / magnetic saturation characteristics of the U-phase / W-phase CT with the turns ratio of the transformer, even if the magnet is demagnetized, It is not mistaken for bias, and the control gain decreases and operates safely.
図１に本発明の実施例を示す。
インバータから出力されフィルタインダクタを流れる電流をDCCTとCTにより検出し、変圧器二次側の負荷電流が隣の相と互い違いにCTを通るように配線することで各相電流の差分を検出するよう構成でき、CTの検出値の向きが互いに逆になるよう直列に接続することで構成される。
FIG. 1 shows an embodiment of the present invention.
The current output from the inverter and flowing through the filter inductor is detected by DCCT and CT, and the load current on the transformer secondary side is staggered from the adjacent phase so that the difference between the currents of each phase is detected. It can be configured, and it is configured by connecting in series so that the directions of CT detection values are opposite to each other.
本発明により高い信頼性と高い応答性を持った誤差の少ない電流制御を行うインバータ電源装置を実現することができる。 According to the present invention, it is possible to realize an inverter power supply apparatus that performs current control with high reliability and high responsiveness and less error.
１ 三相インバータ
２ 交流フィルタ
３ フィルタインダクタ
４ フィルタコンデンサ
５ Δ-Y結線変圧器
６ 直流電流検出器
７ カレントトランス
８ 制御回路
1 Three-
Claims (1)
A three-phase inverter, an AC filter composed of a filter inductor and a filter capacitor connected to the three-phase inverter, and a transformer that is a Δ-Y connection connected to the AC filter are provided. In the inverter power supply device that outputs the phase AC voltage, the inverter further includes a DC current detector connected to acquire the current input to the AC filter, a current transformer connected to acquire the current of the filter inductor unit, and a transformer A current transformer connected to obtain the difference between the phase currents on the secondary side of the transformer, and obtain the current of the filter inductor unit by calculating the difference between the current input to the AC filter and the current output from the transformer. Current transformer connected to obtain the difference in phase current between the transformer and the secondary side of the transformer and its differential connection An inverter power supply device that detects and detects a three-phase inverter based on the detected value .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011162768A JP5943371B2 (en) | 2011-07-26 | 2011-07-26 | Inverter power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011162768A JP5943371B2 (en) | 2011-07-26 | 2011-07-26 | Inverter power supply |
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|---|---|
| JP2013027262A JP2013027262A (en) | 2013-02-04 |
| JP5943371B2 true JP5943371B2 (en) | 2016-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2011162768A Expired - Fee Related JP5943371B2 (en) | 2011-07-26 | 2011-07-26 | Inverter power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106274492B (en) * | 2015-05-27 | 2018-10-26 | 中车大连电力牵引研发中心有限公司 | Auxiliary converter device and rail vehicle used for rail vehicle |
| CN106183860B (en) * | 2016-08-03 | 2018-09-11 | 北京新能源汽车股份有限公司 | Vehicular charging method, apparatus and entire car controller remote control strategy |
| PL241018B1 (en) * | 2018-08-10 | 2022-07-18 | Instytut Napedow I Masz Elektrycznych Komel | Protection of the transformer insulation system |
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| JPS5546829A (en) * | 1978-09-27 | 1980-04-02 | Mitsubishi Electric Corp | Phase shifting windinggattached transformer protecting relay |
| JPS62110433A (en) * | 1985-11-06 | 1987-05-21 | 株式会社東芝 | Protector for three-phase transformer |
| JPH03139175A (en) * | 1989-10-24 | 1991-06-13 | Toshiba Corp | Pwm control power converter |
| JPH08331750A (en) * | 1995-05-31 | 1996-12-13 | Mitsubishi Electric Corp | Power conversion equipment |
| JP3530748B2 (en) * | 1998-08-18 | 2004-05-24 | 三菱電機株式会社 | Power converter |
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