JPH06261548A - Unbalance compensator for three phase/two phase converter - Google Patents
Unbalance compensator for three phase/two phase converterInfo
- Publication number
- JPH06261548A JPH06261548A JP5047605A JP4760593A JPH06261548A JP H06261548 A JPH06261548 A JP H06261548A JP 5047605 A JP5047605 A JP 5047605A JP 4760593 A JP4760593 A JP 4760593A JP H06261548 A JPH06261548 A JP H06261548A
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- JP
- Japan
- Prior art keywords
- power
- phase
- circuit
- current
- harmonic
- 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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Classifications
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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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- Supply And Distribution Of Alternating Current (AREA)
- Ac-Ac Conversion (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、例えば交流電気鉄道
のき電回路に設置され特にその１次側３相交流電圧の不
平衡を補償する３相／２相変換装置用不平衡補償装置に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unbalance compensator for a three-phase / two-phase converter installed in, for example, a feeder circuit of an AC electric railway, and particularly for compensating an unbalance of a primary three-phase AC voltage. It is a thing.
【０００２】[0002]
【従来の技術】図７は例えば昭和６２年電気・情報関連
学会連合大会で発表された従来の３相交流電圧不平衡補
償機能を備えた３相／２相変換装置を示す構成図であ
る。図において、１は３相交流電源、２はその１次側が
３相交流電源１に接続された３相／２相変換用変圧器と
してのスコット結線変圧器、３および４はスコット結線
変圧器２の２次側各巻線に接続されたそれぞれ第１およ
び第２の単相交流負荷としてのＭ座負荷およびＴ座負
荷、５および６はその直流側が直流リアクトル７を介し
て互いに接続され、交流側がそれぞれ搬送波除去用のろ
波器８および９を介してそれぞれＭ座負荷３およびＴ座
負荷４に接続された単相自励式電流形の第１および第２
の電力変換器、５ａ〜５ｄ、６ａ〜６ｄはそれぞれ電力
変換器５および６を構成するスイッチング素子である。2. Description of the Related Art FIG. 7 is a block diagram showing a conventional three-phase / two-phase converter having a three-phase AC voltage unbalance compensating function, which was announced at a joint conference of the Institute of Electrical and Information Engineers, 1987. In the figure, 1 is a 3-phase AC power supply, 2 is a Scott connection transformer as a 3-phase / 2-phase conversion transformer whose primary side is connected to the 3-phase AC power supply 1, and 3 and 4 are Scott connection transformers 2. The M-side load and the T-side load 5 and 6 as the first and second single-phase AC loads respectively connected to the secondary side windings of the DC side are connected to each other via the DC reactor 7, and the AC side is First and second single-phase self-excited current sources connected to the M-seat load 3 and the T-seat load 4 via filters 8 and 9 for removing carrier waves, respectively.
The power converters 5a to 5d and 6a to 6d are switching elements constituting the power converters 5 and 6, respectively.
【０００３】次に動作について説明する。スコット結線
変圧器２は３相交流電源１をＭ座電源およびＴ座電源の
２相に変換するが、単相交流負荷であるＭ座負荷３およ
びＴ座負荷４の各無効電力成分が零で、かつそれぞれの
有効電力成分が等しいとき３相交流電源１の３相電圧、
電流が平衡する。この原理を活用して２次側のＭ座とＴ
座との間で相互に有効電力を融通し、１次側の３相交流
電圧の不平衡を補償している。以下、先ず、この電力融
通の原理について説明する。Next, the operation will be described. The Scott connection transformer 2 converts the three-phase AC power supply 1 into two phases, that is, an M-seat power supply and a T-seat power supply, but the reactive power components of the M-seat load 3 and the T-seat load 4, which are single-phase AC loads, are zero. , And when the respective active power components are equal, the three-phase voltage of the three-phase AC power supply 1,
The current is balanced. Utilizing this principle, M seat and T on the secondary side
Active power is mutually exchanged with the seat to compensate for imbalance of the three-phase AC voltage on the primary side. Hereinafter, first, the principle of this power interchange will be described.
【０００４】電力変換器５，６間の直流リアクトル７に
は常に一定の直流電流を流しておく。そして、Ｍ座負荷
３およびＴ座負荷４の軽重を比較して、軽い方は電力変
換器へ電力を供給し重い方は電力変換器から電力を取り
出すように制御する。即ち、今、Ｍ座負荷３の有効電力
をＰLM、Ｔ座負荷４の有効電力をＰLTとすると、ＰLMが
ＰLTより大きい場合、電力変換器６はＴ座電源から（Ｐ
LM−ＰLT）／２の電力を取り込み、直流リアクトル７を
介して電力変換器５にその電力を供給する。電力変換器
５は電力変換器６から（ＰLM−ＰLT）／２の電力を受け
取り、この電力をＭ座電源へ供給する。A constant DC current is always supplied to the DC reactor 7 between the power converters 5 and 6. Then, the weight of the M seat load 3 and the weight of the T seat load 4 are compared, and the lighter one is controlled to supply power to the power converter and the heavier one to extract power from the power converter. That is, now, effective power P LM of M seat load 3, when the active power of T seat load 4 and P LT, if P LM is greater than P LT, the power converter 6 from T seat power supply (P
LM -P LT) / 2 uptake power and supplies the electric power to the power converter 5 through a DC reactor 7. Receiving power converter 5 from the power converter 6 of power (P LM -P LT) / 2 , and supplies the electric power to the M seat power.
【０００５】このとき、Ｍ座電源が３相交流電源１から
取り込む電力は、 ＰLM−（ＰLM−ＰLT）／２＝（ＰLM＋ＰLT）／２・・・
・・（１） また、Ｔ座電源が３相交流電源１から取り込む電力は、 ＰLM＋（ＰLM−ＰLT）／２＝（ＰLM＋ＰLT）／２・・・
・・（２） となり、スコット結線変圧器２から見たそれぞれＭ座お
よびＴ座にかかる負荷電力は等しくなる。この結果、ス
コット結線変圧器２の１次側の３相電流も平衡する。[0005] At this time, the power M seat power captures the three-phase AC power source 1, P LM - (P LM -P LT) / 2 = (P LM + P LT) / 2 ···
... (1) The power of T seat power captures the three-phase AC power source 1, P LM + (P LM -P LT) / 2 = (P LM + P LT) / 2 ···
.. (2), and the load power applied to the M seat and the T seat viewed from the Scott connection transformer 2 becomes equal. As a result, the three-phase current on the primary side of the Scott connection transformer 2 is also balanced.
【０００６】次に、無効電力補償については、Ｍ座負荷
３およびＴ座負荷４の無効電力をそれぞれＱLM，ＱLTと
表し、これらが遅れ力率の無効電力とすれば、電圧に対
し９０゜位相の遅れた電流を取り込んでいる訳であるか
ら、電力変換器５および６により電圧に対し９０゜位相
の進んだ交流電流に変換してそれぞれＭ座負荷３および
Ｔ座負荷４に供給すれば、３相交流電源１から見た無効
電力は打ち消され有効電力のみとなって力率が改善され
るとともに３相電圧の平衡化もより安全となる。Next, regarding the reactive power compensation, the reactive powers of the M-seat load 3 and the T-seat load 4 are represented as Q LM and Q LT , respectively. Since the current having a phase delay is taken in, the power converters 5 and 6 convert the AC current having a phase advance of 90 degrees with respect to the voltage and supply it to the M seat load 3 and the T seat load 4, respectively. For example, the reactive power seen from the three-phase AC power supply 1 is canceled out and only the active power is recovered, the power factor is improved, and the three-phase voltage is balanced more safely.
【０００７】[0007]
【発明が解決しようとする課題】従来の３相／２相変換
装置用不平衡補償装置は以上のように構成されているの
で、有効電力融通と無効電力補償の制御により、３相電
圧の平衡化および力率改善についてはその機能を発揮す
るが、交流電気車の運転により発生する高調波電流に対
しては考慮されておらず、有害な高調波電流が３相交流
電源に流出するという問題点があった。Since the conventional unbalance compensator for a three-phase / two-phase converter is configured as described above, it is possible to balance the three-phase voltage by controlling active power interchange and reactive power compensation. Although it performs its function to improve the power factor and improve the power factor, it does not take into consideration the harmonic current generated by the operation of the AC electric vehicle, and the harmful harmonic current flows out to the three-phase AC power source. There was a point.
【０００８】この発明は以上のような問題点を解消する
ためになされたもので、従来からの電力変換器を活用し
て高調波電流の抑制も可能となる３相／２相変換装置用
不平衡補償装置を得ることを目的とする。The present invention has been made in order to solve the above-mentioned problems, and a conventional three-phase / 2-phase converter for a three-phase / two-phase converter which can suppress a harmonic current by utilizing a conventional power converter. The purpose is to obtain a balance compensator.
【０００９】[0009]
【課題を解決するための手段】この発明に係る３相／２
相変換装置用不平衡補償装置は、両単相交流負荷の有効
電力を比較し両電力変換器を介してその交流側相互間で
有効電力を融通することにより変換用変圧器から見た２
次側各相有効電力が等しくなるよう指令信号を発生する
電力融通制御回路、第１および第２の単相交流負荷の無
効電力を求めそれぞれ第１および第２の電力変換器で上
記無効電力を補償するよう指令信号を発生する無効電力
補償回路、上記第１および第２の単相交流負荷の高調波
電流を求めそれぞれ上記第１および第２の電力変換器で
上記高調波電流を補償するよう指令信号を発生する高調
波補償回路、および上記電力融通制御回路と無効電力補
償回路と高調波補償回路とからの指令信号に基づき上記
両電力変換器を制御する変換器制御回路を備えたもので
ある。Three phases / 2 according to the present invention
The unbalance compensator for the phase converter sees from the transformer for conversion by comparing the active powers of the two single-phase AC loads and sharing the active power between the AC sides through the two power converters.
A power interchange control circuit that generates a command signal so that the active powers on the secondary side are equal to each other, and the reactive powers of the first and second single-phase AC loads are calculated to obtain the reactive powers by the first and second power converters, respectively. A reactive power compensating circuit that generates a command signal to perform compensation, finds harmonic currents of the first and second single-phase AC loads, and compensates the harmonic currents by the first and second power converters, respectively. A harmonic compensation circuit that generates a command signal, and a converter control circuit that controls both the power converters based on the command signals from the power interchange control circuit, the reactive power compensation circuit, and the harmonic compensation circuit. is there.
【００１０】また、上記で無効電力および高調波電流
は、３相／２相変換用変圧器１次側の３相交流電圧と各
単相交流負荷の電流との検出信号、または上記変圧器の
１次側３相交流電圧と２次側各単相交流電圧との検出信
号から求めることができる。Further, in the above, the reactive power and the harmonic current are detected signals of the three-phase / two-phase conversion transformer primary side three-phase AC voltage and the current of each single-phase AC load, or the above-mentioned transformer. It can be obtained from detection signals of the primary side three-phase AC voltage and the secondary side single-phase AC voltages.
【００１１】[0011]
【作用】この発明に係る３相／２相変換装置用不平衡補
償装置においては、その両電力変換器が２相両相の有効
電力が等しくなるよう有効電力を融通制御し、また、各
単相交流負荷の無効電力および高調波電流を打ち消す補
償制御の動作を行う。In the unbalance compensator for a three-phase / two-phase converter according to the present invention, both of the power converters control the active power so that the active powers of the two-phase and the two-phase are equal, and each of the single power converters is controlled. Performs compensation control operation to cancel the reactive power and harmonic current of the phase AC load.
【００１２】[0012]
【実施例】実施例１．図１はこの発明の実施例１による
３相／２相変換装置用不平衡補償装置を示す構成図であ
る。図において、１〜４は従来と同一のもので説明を省
略する。１０および１１はその直流側が直流コンデンサ
１２と共に互いに接続され交流側がそれぞれＭ座負荷３
およびＴ座負荷４に接続された第１および第２の電力変
換器で、ここでは後述する高調波電流出力制御にも適し
たいわゆるＰＷＭ制御の単相自励式電圧形の電力変換器
を採用している。そして、電力変換器１０はそれぞれＧ
ＴＯサイリスタ１０ｂ、１０ｄ、１０ｆ、１０ｈおよび
各ＧＴＯサイリスタと逆並列接続されたダイオード１０
ａ、１０ｃ、１０ｅ、１０ｇから構成され、電力変換器
１１はそれぞれＧＴＯサイリスタ１１ｂ、１１ｄ、１１
ｆ、１１ｈおよびダイオード１１ａ、１１ｃ、１１ｅ、
１１ｇから構成されている。EXAMPLES Example 1. 1 is a block diagram showing an unbalance compensator for a 3-phase / 2-phase converter according to a first embodiment of the present invention. In the figure, 1 to 4 are the same as the conventional ones and their explanations are omitted. 10 and 11 are connected to each other on the DC side together with the DC capacitor 12 and are connected to the M side load 3 on the AC side, respectively.
And the first and second power converters connected to the T-seat load 4, here, so-called PWM-controlled single-phase self-exciting voltage type power converters that are also suitable for the harmonic current output control described later are adopted. ing. Then, the power converters 10 are respectively G
TO thyristor 10b, 10d, 10f, 10h and diode 10 connected in anti-parallel with each GTO thyristor
Power converter 11 includes GTO thyristors 11b, 11d, and 11a, 10c, 10e, and 10g, respectively.
f, 11h and diodes 11a, 11c, 11e,
It is composed of 11 g.
【００１３】１３および１４はそれぞれＭ座電源および
Ｔ座電源の電圧を検出する電圧検出器である。３４およ
び３５はそれぞれＭ座電源およびＴ座電源の電流を検出
する電流検出器、３６および３７はそれぞれ電力変換器
１０および１１の出力電流を検出する電流検出器であ
る。Reference numerals 13 and 14 are voltage detectors for detecting the voltages of the M and T seat power sources, respectively. Reference numerals 34 and 35 are current detectors for detecting the currents of the M and T seat power supplies, respectively, and 36 and 37 are current detectors for detecting the output currents of the power converters 10 and 11, respectively.
【００１４】１５はＭ座とＴ座との相互間で有効電力の
授受を制御する電力融通制御回路、１６〜２１は電力変
換器１０の制御回路で、１６は直流電圧制御回路、１７
は無効電力補償回路、１８は高調波補償回路、１９は以
上１５〜１８の制御回路の出力信号に基づき電力変換器
１０の出力電流指令を演算し、後述する２０，２１とと
もに変換器制御回路を構成する電流指令演算回路、２０
はこの電流指令演算回路１９の出力を指令として電力変
換器１０の出力電流制御を行う電流制御回路、２１は電
流制御回路２０からの信号に基づき電力変換器１０のＧ
ＴＯサイリスタのスイッチング制御を行うＰＷＭ制御回
路である。また、２２〜２７は電力変換器１１の制御回
路で、それぞれ既述した１６〜２１に相当するものであ
る。Reference numeral 15 is a power interchange control circuit for controlling the transfer of active power between the M seat and the T seat, 16 to 21 are control circuits for the power converter 10, 16 is a DC voltage control circuit, and 17 is a control circuit.
Is a reactive power compensating circuit, 18 is a harmonic compensating circuit, 19 is an output current command of the power converter 10 based on the output signals of the control circuits 15 to 18, and a converter control circuit is provided together with 20, 21 described later. Comprising current command calculation circuit, 20
Is a current control circuit that controls the output current of the power converter 10 using the output of the current command calculation circuit 19 as a command, and 21 is a G of the power converter 10 based on a signal from the current control circuit 20.
It is a PWM control circuit that performs switching control of the TO thyristor. Further, 22 to 27 are control circuits of the power converter 11, which correspond to the above-mentioned 16 to 21, respectively.
【００１５】次に動作について説明する。図１で示した
電力変換器１０は、スコット結線変圧器２の２次側のＭ
座電源回路の交流電力と直流コンデンサ１２から構成さ
れる直流中間回路の直流電力との間で双方向の電力授受
を行う機能をもち、また電力変換器１１は、同様にスコ
ット結線変圧器２の２次側のＴ座電源回路の交流電力と
上記直流中間回路の直流電力との間で双方向の電力授受
を行う機能をもち、Ｍ座電源回路とＴ座電源回路との間
の有効電力の授受を直流中間回路を介して行うことがで
きる。Next, the operation will be described. The power converter 10 shown in FIG. 1 is the secondary side M of the Scott connection transformer 2.
The power converter 11 has a function of bidirectionally exchanging power between the AC power of the DC power supply circuit and the DC power of the DC intermediate circuit composed of the DC capacitor 12, and the power converter 11 of the Scott connection transformer 2 similarly. It has a function of bidirectional power transfer between the AC power of the T-seat power supply circuit on the secondary side and the DC power of the DC intermediate circuit, and the effective power of the M-seat power supply circuit and the T-seat power supply circuit is exchanged. The transfer can be done via a DC intermediate circuit.
【００１６】直流中間回路の電圧を直流電圧制御回路１
６および２２で常に一定に制御した状態で、Ｍ座負荷３
およびＴ座負荷４の電力を比較し、負荷の少ない方の電
源回路に接続された電力変換器はこの電源回路から有効
電力を取り込み、直流中間回路に電力を供給し、負荷の
多い方の電源回路に接続された電力変換器は直流中間回
路から有効電力を取り込み、この電源回路に電力を供給
する。この結果、Ｍ座電源回路およびＴ座電源回路の有
効電力を等しくすることができ、スコット結線変圧器１
次側の３相交流電源１の３相電流は少なくともその有効
分は平衡する。以上は、主として電力融通制御回路１５
の制御動作によって達成される。The voltage of the DC intermediate circuit is set to the DC voltage control circuit 1
M seat load 3 with constant control at 6 and 22
And the power of the T-seat load 4 are compared, and the power converter connected to the power supply circuit with the smaller load takes in the active power from this power supply circuit and supplies the power to the DC intermediate circuit, and the power supply with the larger load. A power converter connected to the circuit takes active power from the DC intermediate circuit and supplies power to this power circuit. As a result, the active powers of the M-seat power supply circuit and the T-seat power supply circuit can be equalized, and the Scott connection transformer 1
At least the effective portion of the three-phase current of the three-phase AC power supply 1 on the secondary side is balanced. The above is mainly the power interchange control circuit 15
It is achieved by the control operation of.
【００１７】次に、Ｍ座負荷３およびＴ座負荷４の無効
電力および高調波電流の補償は、Ｍ座電源側およびＴ座
電源側それぞれ独立して電力変換器１０および１１によ
り行うことができる。図２はこの無効電力補償回路およ
び高調波補償回路の内部構成を示すもので、電力変換器
１０と１１においては同じ構成であるので以下電力変換
器１０についてのみ説明する。Next, the reactive power and harmonic current of the M-seat load 3 and the T-seat load 4 can be compensated by the power converters 10 and 11 independently of the M-seat power supply side and the T-seat power supply side, respectively. . FIG. 2 shows the internal configuration of the reactive power compensating circuit and the harmonic compensating circuit. Since the power converters 10 and 11 have the same configuration, only the power converter 10 will be described below.
【００１８】図２において、２８は負荷電流検出回路
で、ＡＣＣＴ等の電流検出器３４および３６からのＭ座
電源電流および電力変換器１０の出力電流の検出値を入
力し、Ｍ座負荷３の電流を求める。なお、Ｍ座負荷３の
電流を直接検出できる場合はその検出値を用いても差し
支えない。また、２９は電圧同期回路で電圧検出器１３
からのＭ座電源電圧の検出値を入力し、この電圧に同期
したＳＩＮ信号およびＣＯＳ信号を発生する。In FIG. 2, reference numeral 28 denotes a load current detection circuit, which inputs the detected values of the M seat power source current and the output current of the power converter 10 from the current detectors 34 and 36 such as ACCT, and inputs the detected value of the M seat load 3. Find the current. If the current of the M seat load 3 can be directly detected, the detected value may be used. Further, 29 is a voltage synchronizing circuit, which is a voltage detector 13
The detected value of the M seat power supply voltage from is input and the SIN signal and the COS signal synchronized with this voltage are generated.
【００１９】負荷電流検出回路２８および電圧同期回路
２９の出力信号はそれぞれ有効分演算回路３０および無
効分演算回路３１に入力され、ここでＭ座負荷電流の有
効成分および無効成分が演算される。３２はＨＰＦ（ハ
イパスフィルタ）からなる高調波検出回路で、有効分演
算回路３０および無効分演算回路３１の出力信号から高
調波成分を抽出して補償対象の高調波電流信号を出力す
る。有効分演算回路３０および無効分演算回路３１の演
算過程で電流の基本波成分が直流となっているので、高
調波検出回路３２における高調波成分の抽出が確実高精
度になされる。３３はＬＰＦ（ローパスフィルタ）から
なる無効電力検出回路で、無効分演算回路３１の出力信
号から無効成分を抽出して補償対象の無効電力信号を出
力する。この場合も、無効分演算回路３１の演算過程で
電流の基本波成分が直流となっているので無効電力検出
回路３３における基本波無効成分の抽出が確実高精度に
なされる。なお、上記では負荷電流を入力して一旦有効
分無効分演算を行った後高調波電流を検出するようにし
たが、負荷電流からＨＰＦで直接高調波分を抽出検出す
るようにしてもよい。The output signals of the load current detection circuit 28 and the voltage synchronization circuit 29 are input to the effective component arithmetic circuit 30 and the reactive component arithmetic circuit 31, respectively, where the effective and ineffective components of the M seat load current are calculated. Reference numeral 32 denotes a harmonic wave detection circuit including an HPF (high-pass filter), which extracts a harmonic wave component from output signals of the effective component calculation circuit 30 and the reactive component calculation circuit 31 and outputs a harmonic current signal to be compensated. Since the fundamental wave component of the current is DC in the process of calculation by the effective component calculation circuit 30 and the reactive component calculation circuit 31, the harmonic component extraction by the harmonic detection circuit 32 is surely performed with high accuracy. Reference numeral 33 is a reactive power detection circuit including an LPF (low pass filter), which extracts a reactive component from the output signal of the reactive component calculation circuit 31 and outputs a reactive power signal to be compensated. Also in this case, since the fundamental wave component of the current is DC in the process of calculation by the reactive component calculation circuit 31, the extraction of the fundamental wave reactive component in the reactive power detection circuit 33 is surely performed with high accuracy. In the above description, the harmonic current is detected after inputting the load current and once performing the effective / reactive component calculation. However, the HPF may be directly extracted and detected by the HPF from the load current.
【００２０】図１に戻り、電力融通制御回路１５，直流
電圧制御回路１６，無効電力補償回路１７および高調波
補償回路１８はそれぞれの制御目標に合致した指令信号
を出力するが、これらの信号は電流指令演算回路１９で
一括統合されその指令信号に基づき電流制御回路２０お
よびＰＷＭ制御回路２１を経て電力変換器１０の各ＧＴ
Ｏサイリスタ１０ｂ等のオンオフスイッチング制御がな
される。Returning to FIG. 1, the power interchange control circuit 15, the DC voltage control circuit 16, the reactive power compensating circuit 17 and the harmonic compensating circuit 18 output command signals which match their respective control targets. Each of the GTs of the power converter 10 is integrated by the current command calculation circuit 19 through the current control circuit 20 and the PWM control circuit 21 based on the command signal.
ON / OFF switching control of the O thyristor 10b and the like is performed.
【００２１】以上、Ｍ座電源回路における無効電力およ
び高調波電流の補償について説明したがＴ座電源回路に
おいても同様であり、両回路で無効電力を零として３相
交流電源１の出力を力率１にすることができる。同時
に、両電源回路において電気車負荷電流に含まれる高調
波分を補償して３相交流電源１への高調波電流の流出を
防ぎ電源電圧の高調波歪を低減することができ、３相電
圧、電流の完全な平衡化が得られる。The compensation of the reactive power and the harmonic current in the M seat power supply circuit has been described above, but the same applies to the T seat power supply circuit, in which the reactive power is zero in both circuits and the output of the three-phase AC power supply 1 is the power factor. It can be 1. At the same time, in both power supply circuits, the harmonic components contained in the electric vehicle load current can be compensated to prevent the harmonic current from flowing out to the three-phase AC power supply 1 and reduce the harmonic distortion of the power supply voltage. , A perfect balance of current is obtained.
【００２２】実施例２．図３はこの発明の実施例２によ
る３相／２相変換装置用不平衡補償装置を示す構成図で
ある。先の実施例１では電圧検出器１３によりＭ座電源
電圧を検出し、また、電圧検出器１４によりＴ座電源電
圧を検出して電力変換器１０および１１の同期電源とし
たのに対し、この実施例２においては、スコット結線変
圧器２の１次側に３相電圧検出器３８を設けてこの検出
値を同期電源としている。即ち、図４に示すように、電
圧同期回路２９は３相電圧検出器３８からの３相電源電
圧の検出値を入力し、これから有効分、無効分演算に必
要な信号を作成する。この場合、３相電圧間の位相ずれ
がなく、かつ検出対象電圧の歪も少ないので、より正確
な同期電源が得られ、電力変換器１０および１１による
補償特性がより高精度となる。Example 2. 3 is a block diagram showing an unbalance compensator for a three-phase / two-phase converter according to a second embodiment of the present invention. In the first embodiment, the M detector power supply voltage is detected by the voltage detector 13 and the T seat power supply voltage is detected by the voltage detector 14 to be used as the synchronous power supply for the power converters 10 and 11. In the second embodiment, a three-phase voltage detector 38 is provided on the primary side of the Scott connection transformer 2 and the detected value is used as a synchronous power supply. That is, as shown in FIG. 4, the voltage synchronization circuit 29 inputs the detected value of the three-phase power supply voltage from the three-phase voltage detector 38, and creates a signal necessary for the effective / ineffective component calculation from this. In this case, since there is no phase shift between the three-phase voltages and the distortion of the voltage to be detected is small, a more accurate synchronous power supply can be obtained, and the compensation characteristics of the power converters 10 and 11 are more accurate.
【００２３】実施例３．図５はこの発明の実施例３によ
る３相／２相変換装置用不平衡補償装置を示す構成図で
ある。ここでは、電圧検出器１３によりＭ座電源電圧
を、電圧検出器１４によりＴ座電源電圧を検出し、これ
ら検出値と３相電圧検出器３８の検出値とから補償すべ
き無効電力指令および高調波電流指令を求めている。即
ち、図６に示すように、電圧変動検出回路３９はＭ座電
源電圧の検出値と３相電源電圧の検出値とを入力し、予
め記憶しているスコット結線変圧器２のインピーダンス
特性データを基にＭ座電源電流を求めその出力信号と電
圧同期回路２９からの同期信号とから無効電力検出回路
３３が無効電力指令を発生する。また、電圧ひずみ検出
回路４０はＭ座電源電圧の検出値と３相電源電圧の検出
値との差から電圧ひずみを検出し、更に高調波検出回路
３２が高調波電流指令を発生する。前掲実施例ではＭ座
電源回路およびＴ座電源回路に挿入されていた電流検出
器３４および３５は、一般に機器が大形化し、新たに設
置するのは容易でないが、この実施例３ではこれら電流
検出器３４、３５が不要となるので、設備がその分簡単
になるという利点がある。Example 3. 5 is a block diagram showing an unbalance compensator for a 3-phase / 2-phase converter according to a third embodiment of the present invention. Here, the M detector power supply voltage is detected by the voltage detector 13, and the T seat power supply voltage is detected by the voltage detector 14, and the reactive power command and the harmonic to be compensated are detected from these detected values and the detected values of the three-phase voltage detector 38. Seeking a wave current command. That is, as shown in FIG. 6, the voltage fluctuation detection circuit 39 inputs the detected value of the M-spot power supply voltage and the detected value of the three-phase power supply voltage, and stores the previously stored impedance characteristic data of the Scott connection transformer 2. Based on the M seat power source current, the reactive power detection circuit 33 generates a reactive power command from the output signal thereof and the synchronizing signal from the voltage synchronizing circuit 29. Further, the voltage distortion detection circuit 40 detects voltage distortion from the difference between the detected value of the M seat power supply voltage and the detected value of the three-phase power supply voltage, and the harmonic detection circuit 32 further generates a harmonic current command. Although the current detectors 34 and 35 inserted into the M-seat power supply circuit and the T-seat power supply circuit in the above-described embodiment are generally large in size and are not easy to install newly, these currents are not included in the third embodiment. Since the detectors 34 and 35 are not required, there is an advantage that the equipment is simplified accordingly.
【００２４】実施例４．なお、上記各実施例では、電力
変換器１０，１１としてＧＴＯサイリスタをスイッチン
グ素子とする単相自励式電圧形のものとしたが、スイッ
チング素子としてパワートランジスタ、ＩＧＢＴ、パワ
ーＭＯＳＦＥＴその他の自己消弧形半導体素子を用いて
もこの発明は上記したと同様の効果を奏する。また、電
力変換器のタイプとして、必ずしもＰＷＭ制御電圧形の
ものに限られるものではなく、補償対象とする高調波の
周波数範囲によっては電流形変換器も使用することがで
きる。更に、上記各実施例では３相／２相変換用変圧器
としてスコット結線変圧器２を使用した場合について説
明したが、同様の機能をもつ例えば変形ウッドブリッジ
結線変圧器等を使用してもよい。Example 4. In each of the above-described embodiments, the power converters 10 and 11 are of the single-phase self-excited voltage type using GTO thyristors as switching elements. However, power transistors, IGBTs, power MOSFETs, and other self-extinguishing types are used as switching elements. Even if a semiconductor element is used, the present invention has the same effect as described above. Further, the type of the power converter is not necessarily limited to the PWM control voltage type, and a current type converter may be used depending on the frequency range of the harmonic wave to be compensated. Further, in each of the above embodiments, the case where the Scott connection transformer 2 is used as the three-phase / two-phase conversion transformer has been described, but a modified Woodbridge connection transformer or the like having the same function may be used. .
【００２５】[0025]
【発明の効果】この発明は以上のように、電力融通制御
回路、無効電力補償回路に加えて高調波補償回路を備
え、これら回路からの指令信号に基づき両電力変換器を
制御するようにしたので、２相側の有効電力が均等とな
り、同時に無効電力および高調波電流が補償される。従
って、３相交流電源電流の不平衡が確実になくなり、３
相交流電源から見た力率も１に改善されその電圧の歪も
なくなる。As described above, the present invention is provided with a harmonic compensating circuit in addition to a power accommodation control circuit and a reactive power compensating circuit, and controls both power converters based on a command signal from these circuits. Therefore, the active power on the two-phase side becomes equal, and at the same time, the reactive power and the harmonic current are compensated. Therefore, the unbalance of the three-phase AC power supply current is surely eliminated, and
The power factor seen from the phase alternating current power supply is also improved to 1, and the distortion of the voltage is also eliminated.
【００２６】また、無効電力、高調波電流を求めるのに
３相交流電圧の検出値を使用するようにした場合は、検
出誤差が低くなり、補償電流の精度が向上する。Further, when the detected values of the three-phase AC voltage are used to obtain the reactive power and the harmonic current, the detection error is reduced and the accuracy of the compensation current is improved.
【００２７】更に、無効電力、高調波電流を３相／２相
変換用変圧器の１次側３相交流電圧と２次側単相交流電
圧との検出値から求めるようにすれば、変圧器２次側回
路に電流検出器を挿入する必要がなく、設備がその分簡
単となる。Furthermore, if the reactive power and the harmonic current are obtained from the detected values of the primary side three-phase AC voltage and the secondary side single-phase AC voltage of the three-phase / two-phase conversion transformer, the transformer can be obtained. There is no need to insert a current detector in the secondary side circuit, and the equipment is simplified accordingly.
【図１】この発明の実施例１による３相／２相変換装置
用不平衡補償装置を示す構成図である。FIG. 1 is a configuration diagram showing an unbalance compensator for a three-phase / two-phase converter according to a first embodiment of the present invention.
【図２】図１の無効電力補償回路および高調波補償回路
の内部構成を示す図である。FIG. 2 is a diagram showing an internal configuration of a reactive power compensation circuit and a harmonic compensation circuit of FIG.
【図３】この発明の実施例２による３相／２相変換装置
用不平衡補償装置を示す構成図である。FIG. 3 is a configuration diagram showing an unbalance compensator for a three-phase / two-phase converter according to a second embodiment of the present invention.
【図４】図３の無効電力補償回路および高調波補償回路
の内部構成を示す図である。FIG. 4 is a diagram showing an internal configuration of a reactive power compensation circuit and a harmonic compensation circuit of FIG.
【図５】この発明の実施例３による３相／２相変換装置
用不平衡補償装置を示す構成図である。FIG. 5 is a configuration diagram showing an unbalance compensator for a 3-phase / 2-phase converter according to a third embodiment of the present invention.
【図６】図５の無効電力補償回路および高調波補償回路
の内部構成を示す図である。6 is a diagram showing internal configurations of a reactive power compensation circuit and a harmonic compensation circuit of FIG.
【図７】従来の３相／２相変換装置用不平衡補償装置を
示す構成図である。FIG. 7 is a configuration diagram showing a conventional unbalance compensator for a 3-phase / 2-phase converter.
１ ３相交流電源 ２ スコット結線変圧器 ３ Ｍ座負荷 ４ Ｔ座負荷 １０，１１ 電力変換器 １２ 直流コンデンサ １３，１４ 電圧検出器 １５ 電力融通制御回路 １７，２３ 無効電力補償回路 １８，２４ 高調波補償回路 １９，２５ 電流指令演算回路 ３４〜３７ 電流検出器 ３８ ３相電圧検出器 1 3 Phase AC Power Supply 2 Scott Connection Transformer 3 M Seat Load 4 T Seat Load 10,11 Power Converter 12 DC Capacitor 13, 14 Voltage Detector 15 Power Interchange Control Circuit 17,23 Reactive Power Compensation Circuit 18,24 Harmonics Compensation circuit 19,25 Current command calculation circuit 34-37 Current detector 38 Three-phase voltage detector
───────────────────────────────────────────────────── フロントページの続き (72)発明者 竹田 正俊 神戸市兵庫区和田崎町１丁目１番２号 三 菱電機株式会社神戸製作所内 (72)発明者 宮下 武司 神戸市兵庫区和田崎町１丁目１番２号 三 菱電機株式会社神戸製作所内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Masatoshi Takeda Inventor Masatoshi Takeda 1-2-1, Wadasaki-cho, Hyogo-ku, Kobe Sanryo Electric Co., Ltd. Kobe Works (72) Takeshi Miyashita Wadazaki-cho, Hyogo-ku, Kobe 1 Chome 1-2 Sanrishi Electric Co., Ltd. Kobe Works
Claims (3)
がそれぞれ第１と第２の単相交流負荷に接続された３相
／２相変換用変圧器、直流側が互いに接続され交流側が
それぞれ上記第１および第２の単相交流負荷に接続され
た第１および第２の電力変換器、上記両単相交流負荷の
有効電力を比較し上記両電力変換器を介してその交流側
相互間で有効電力を融通することにより上記変換用変圧
器から見た２次側各相有効電力が等しくなるよう指令信
号を発生する電力融通制御回路、上記第１および第２の
単相交流負荷の無効電力を求めそれぞれ上記第１および
第２の電力変換器で上記無効電力を補償するよう指令信
号を発生する無効電力補償回路、上記第１および第２の
単相交流負荷の高調波電流を求めそれぞれ上記第１およ
び第２の電力変換器で上記高調波電流を補償するよう指
令信号を発生する高調波補償回路、および上記電力融通
制御回路と無効電力補償回路と高調波補償回路とからの
指令信号に基づき上記両電力変換器を制御する変換器制
御回路を備えた３相／２相変換装置用不平衡補償装置。1. A three-phase / two-phase conversion transformer, the primary side of which is connected to a three-phase AC power source and the secondary side of which is connected to first and second single-phase AC loads, respectively. The first and second power converters respectively connected to the first and second single-phase AC loads, and the active powers of the both single-phase AC loads are compared with each other, and the two AC converters are connected to each other via the two power converters. A power interchange control circuit that generates a command signal so that the active power of each secondary side viewed from the transformer for conversion becomes equal by accommodating the active power between the first and second single-phase AC loads. A reactive power compensating circuit for obtaining a reactive power and generating a command signal for compensating the reactive power by the first and second power converters, respectively, and a harmonic current of the first and second single-phase AC loads are obtained. The above first and second power converters, respectively , A harmonic compensating circuit for generating a command signal to compensate the harmonic current, and controlling both power converters based on command signals from the power interchange control circuit, reactive power compensating circuit and harmonic compensating circuit. An unbalance compensator for a three-phase / two-phase converter having a converter control circuit.
流電圧と各単相交流負荷の電流とを検出し、これらから
無効電力および高調波電流を求めるようにしたことを特
徴とする請求項１記載の３相／２相変換装置用不平衡補
償装置。2. A three-phase / two-phase conversion transformer primary-side three-phase AC voltage and current of each single-phase AC load are detected, and reactive power and harmonic current are obtained from them. The unbalance compensator for a three-phase / two-phase converter according to claim 1.
流電圧と２次側各単相交流電圧とを検出し、これらから
無効電力および高調波電流を求めるようにしたことを特
徴とする請求項１記載の３相／２相変換装置用不平衡補
償装置。3. A method for detecting reactive power and harmonic current from primary-side three-phase AC voltage and secondary-side single-phase AC voltage of a three-phase / two-phase conversion transformer, respectively. The unbalance compensator for a three-phase / two-phase converter according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5047605A JP2828863B2 (en) | 1993-03-09 | 1993-03-09 | Unbalance compensator for 3-phase / 2-phase converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5047605A JP2828863B2 (en) | 1993-03-09 | 1993-03-09 | Unbalance compensator for 3-phase / 2-phase converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06261548A true JPH06261548A (en) | 1994-09-16 |
| JP2828863B2 JP2828863B2 (en) | 1998-11-25 |
Family
ID=12779876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5047605A Expired - Lifetime JP2828863B2 (en) | 1993-03-09 | 1993-03-09 | Unbalance compensator for 3-phase / 2-phase converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2828863B2 (en) |
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-
1993
- 1993-03-09 JP JP5047605A patent/JP2828863B2/en not_active Expired - Lifetime
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