JPH08237868A - Controller for power converter - Google Patents
Controller for power converterInfo
- Publication number
- JPH08237868A JPH08237868A JP7039681A JP3968195A JPH08237868A JP H08237868 A JPH08237868 A JP H08237868A JP 7039681 A JP7039681 A JP 7039681A JP 3968195 A JP3968195 A JP 3968195A JP H08237868 A JPH08237868 A JP H08237868A
- Authority
- JP
- Japan
- Prior art keywords
- power converter
- phase
- current
- voltage
- power
- 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.)
- Granted
Links
Classifications
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は直流連系設備の電力変換
器の制御装置に係り，特に複数相における電力変換の転
流動作が起きたことを確実に検出できる電力変換器の制
御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for a power converter of DC interconnection equipment, and more particularly to a controller for a power converter capable of reliably detecting commutation operation of power conversion in a plurality of phases. .
【０００２】また、本発明はさらに、電力変換器の余裕
角を事故発生時等の異常時にも確実に検出できる装置に
関する。Further, the present invention relates to a device which can surely detect a margin of a power converter even in the case of an abnormality such as an accident.
【０００３】[0003]
【従来の技術】サイリスタを用いた他励式の変換器の場
合、系統の交流電圧を用いて転流を行うため、交流系統
事故時に転流失敗を起こしやすい。転流失敗を防止する
ためには余裕角をある一定値以上に保つことが必要で、
そのため余裕角制御が実施されている。余裕角制御に
は、直流電流と交流電圧とから重なり角を算定して制御
角を定める開ループ方式と，実余裕角を検出して制御す
る閉ループ方式とがある。このうち開ループ方式は、交
流電圧波形が正弦波であることを前提としているため、
事故等により交流電圧波形が歪んだ場合の対応が難しい
が、閉ループ方式では波形歪みの影響も含まれた実際の
余裕角を用いるので、必要最小限の余裕角を確保する制
御が容易に実現できる。2. Description of the Related Art In the case of a separately excited converter using a thyristor, commutation is performed using the AC voltage of the system, so that commutation failure is likely to occur in the event of an AC system accident. In order to prevent commutation failure, it is necessary to keep the margin angle above a certain value.
Therefore, the margin angle control is implemented. The margin angle control includes an open loop method that calculates an overlapping angle from a DC current and an AC voltage to determine a control angle, and a closed loop method that detects and controls an actual margin angle. Among them, the open loop method is based on the assumption that the AC voltage waveform is a sine wave,
It is difficult to deal with the case where the AC voltage waveform is distorted due to an accident, etc., but in the closed loop method, the actual margin angle that also includes the effect of waveform distortion is used, so it is possible to easily realize control that secures the minimum margin angle required. .
【０００４】閉ループ方式で用いる余裕角は、転流動作
が完了してから相間電圧が反転するまでの期間に相当す
る電気角で定義される。余裕角の検出方法としては、バ
ルブの両端の電圧を直接測定して検出する方法と，変換
用変圧器の変換器側電流と交流系統側電圧とから間接的
に検出する方法とがある。前者の方法ではバルブの電圧
検出値を制御装置に取り込む必要があるのに対して、後
者の方法では通常の制御装置で用いる検出値をそのまま
用いることができる。The margin angle used in the closed loop system is defined by the electrical angle corresponding to the period from the completion of commutation operation to the reversal of the interphase voltage. As a method of detecting the margin angle, there are a method of directly measuring and detecting the voltage across the valve, and a method of indirectly detecting from the converter side current of the conversion transformer and the AC system side voltage. In the former method, the detected voltage value of the valve needs to be taken into the control device, whereas in the latter method, the detected value used in the normal control device can be used as it is.
【０００５】変圧器電流と交流系統電圧とを用いて余裕
角を検出する方法としては、IEEETransactions On Powe
r Apparatus And Systems,８７巻，３号，８５９〜８６
５頁に記載されているような方法がある。これは、たと
えばＵ相からＶ相に転流する場合は、Ｕ相の電流の大き
さが０またはある一定値より小さくなったことをもって
転流動作が完了したと判定し、転流動作完了からＵＶ相
間の交流電圧が０になるまでの時間から余裕角を算定す
るというものである。As a method for detecting the margin angle using the transformer current and the AC system voltage, IEEE Transactions On Powe
r Apparatus And Systems, Vol. 87, No. 3, 859-86
There is a method as described on page 5. This is because, for example, when commutating from the U phase to the V phase, it is determined that the commutation operation is completed when the magnitude of the U phase current becomes 0 or smaller than a certain constant value, and the commutation operation is completed. The margin angle is calculated from the time until the AC voltage between the UV phases becomes zero.
【０００６】[0006]
【発明が解決しようとする課題】上記の方法で余裕角を
検出する場合、変圧器電流の大きさが一定値より小さく
なったことだけで転流動作完了と判定すると、事故など
により直流短絡状態になった際に変圧器に流れる電流が
０となり、実際は転流が行われていないのに転流動作が
完了したと判定してしまうことがある。When the margin angle is detected by the above method, if it is determined that the commutation operation is completed simply because the magnitude of the transformer current is smaller than a certain value, a DC short circuit condition may occur due to an accident or the like. Then, the current flowing through the transformer becomes 0, and it may be determined that the commutation operation is completed even though the commutation is not actually performed.
【０００７】本発明の目的は、直流短絡時などの異常時
にも確実に転流動作完了の有無が判定ができ、確実に余
裕角を検出して転流失敗を防止できる電力変換器の制御
装置を提供することにある。An object of the present invention is to control a power converter capable of surely determining the completion of commutation operation even when an abnormality such as a DC short circuit occurs and reliably detecting a margin angle to prevent commutation failure. To provide.
【０００８】また、余裕角状態を検出する時に、転流失
敗が生じてしまった場合には、余裕角制御を正しく行う
ことが困難であった。Further, when a commutation failure occurs when detecting the allowance angle state, it is difficult to perform the allowance angle control correctly.
【０００９】本発明の目的は、直流短絡時などの異常時
にも確実に転流動作完了の有無が判定できる電力変換器
の制御装置を提供することにある。An object of the present invention is to provide a control device for a power converter that can reliably determine the presence or absence of commutation operation even in the event of an abnormality such as a DC short circuit.
【００１０】さらに本発明の他の目的は、確実に余裕角
を検出して、転流失敗を防止できる電力変換器の制御装
置を提供することにある。Still another object of the present invention is to provide a controller for a power converter which can surely detect a margin angle and prevent commutation failure.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するため
に、直流電力系統と複数相の交流電力系統の間で、交流
電力と直流電力との電力変換を行う電力変換器の制御装
置において、第１の交流相と第２の交流相との間で転流
動作を行う際に、第１の交流電流と，第２の交流電流と
を検出する第１，第２の電流検出手段とを有し、第１の
相の電流値が第１の規定値よりも小さくなり、かつ第２
の相の電流値が第２の規定値よりも大きくなることをも
って転流動作を検出するようにしたものである。In order to achieve the above object, in a controller of a power converter for converting power between AC power and DC power between a DC power system and a multi-phase AC power system, A first and second current detecting means for detecting the first alternating current and the second alternating current when performing the commutation operation between the first alternating current phase and the second alternating current phase. And the current value of the first phase is smaller than the first specified value, and the second
The commutation operation is detected when the current value of the phase becomes larger than the second specified value.
【００１２】また、他の目的を達成するために、直流電
力系統と複数相の交流電力系統の間で、交流電力と直流
電力との電力変換を行う電力変換器の制御装置におい
て、第１の交流相と第２の交流相との間で転流動作を行
う際に、第１の交流電圧と，第２の交流電圧とを検出す
る第１，第２の電圧検出手段とを有し、かつ、第１の交
流電流と，第２の交流電流とを検出する第１，第２の電
流検出手段とを有し、これら、第１，第２の電圧検出手
段からの電圧信号と，第１，第２の電流検出手段からの
電流信号とを入力して、第１，第２の交流相との間で転
流動作を行う電力変換器の余裕角を検出する余裕角検出
手段を備えたものである。Further, in order to achieve another object, in a control device of a power converter for converting power between AC power and DC power between a DC power system and a multi-phase AC power system, When a commutation operation is performed between the AC phase and the second AC phase, it has first and second voltage detection means for detecting the first AC voltage and the second AC voltage, Further, it has first and second current detecting means for detecting the first alternating current and the second alternating current, and these voltage signals from the first and second voltage detecting means, and And a margin angle detecting means for detecting the margin angle of the power converter that performs commutation operation with the first and second AC phases by inputting the current signals from the first and second current detecting means. It is a thing.
【００１３】また、本発明の電力変換器の制御装置にお
いては、余裕角検出手段が第１の電流検出値が第１の規
定値よりも小さくなり、かつ第２の電流検出値が第２の
規定値よりも大きくなる条件と、第２の電圧検出値が第
１の電圧検出値よりも小さくなる条件とを用いて余裕角
を検出するようにしたものである。Further, in the controller of the power converter of the present invention, the margin angle detecting means makes the first current detection value smaller than the first specified value, and the second current detection value becomes the second current detection value. The margin angle is detected under the condition that the detected value is larger than the specified value and the condition that the second detected voltage value is smaller than the first detected voltage value.
【００１４】さらに、本発明の電力変換器の制御装置に
おいては、余裕角検出手段が第２の交流相を転流する電
力変換器への制御信号を検出して、電力変換器の余裕角
を求めるようにしたものである。Further, in the power converter control device of the present invention, the margin angle detecting means detects the control signal to the power converter for commutating the second AC phase to determine the margin angle of the power converter. It's something I asked for.
【００１５】また、余裕角検出手段は電力変換器への制
御信号を検出してから所定の位相期間中であることを条
件に余裕角を検出するようにしたものである。Further, the allowance angle detecting means is adapted to detect the allowance angle on condition that a predetermined phase period has elapsed since the control signal to the power converter was detected.
【００１６】また、余裕角検出手段は、第２の電圧検出
値が第１の電圧検出値よりも小さくなることを検出し
て、余裕角をサンプリングするようにしたものである。The margin angle detecting means is adapted to detect that the second voltage detection value is smaller than the first voltage detection value and sample the margin angle.
【００１７】さらに、余裕角検出手段は第２の交流相の
電圧値の零点を検出した後で余裕角をサンプリングする
ようにしたものである。Further, the allowance angle detecting means is adapted to sample the allowance angle after detecting the zero point of the voltage value of the second AC phase.
【００１８】そして、余裕角検出手段は電力変換器への
制御信号を検出してから、所定の位相期間後又は、所定
の時間後に余裕角をサンプリングするようにしたもので
ある。The allowance angle detecting means is adapted to sample the allowance angle after a predetermined phase period or a predetermined time after detecting the control signal to the power converter.
【００１９】[0019]
【作用】従来の電力変換器の制御装置においては、たと
えば電力変換器が直流短絡状態になると、電力変換器を
通る電流は外部の交流系統、特に変換用の変圧器には正
常に流れなくなる。従来の方法では、電流の大きさがあ
る値より小さくなったことで転流動作を判定するため、
このような場合でも転流動作が完了したと判定してしま
う。In the conventional controller for the power converter, for example, when the power converter is in the DC short-circuit state, the current passing through the power converter will not normally flow to the external AC system, especially the conversion transformer. In the conventional method, since the commutation operation is judged by the magnitude of the current being smaller than a certain value,
Even in such a case, it is determined that the commutation operation is completed.
【００２０】本発明によれば、第１の交流相から第２の
交流相へと転流する場合、第２の交流相による電流があ
る値より大きくならないと転流動作完了と判定しないた
め、上記のような場合には転流していたいと判定するこ
とが可能となる。したがって、余裕角がないことを確実
に検出することができる。According to the present invention, when commutating from the first AC phase to the second AC phase, the commutation operation is not completed unless the current due to the second AC phase becomes larger than a certain value. In the above case, it is possible to determine that it is desired to be commutated. Therefore, it is possible to reliably detect that there is no margin.
【００２１】また、別の本発明によれば、第１の交流相
と第２の交流相との間で転流動作を行う時に、第１，第
２の交流相の第１，第２の交流電圧信号と、第１，第２
の交流電流信号とを入力して、電力変換器の余裕角を検
出する余裕角検出手段を備えたものである。According to another aspect of the present invention, when the commutation operation is performed between the first AC phase and the second AC phase, the first and second AC phases of the first and second AC phases are performed. AC voltage signal, first and second
And an allowance angle detection means for detecting the allowance angle of the power converter.
【００２２】また、本発明の電力変換器の制御装置にお
いては、余裕角検出手段が第１の電流検出値が第１の規
定値よりも小さくなり、かつ第２の電流検出値が第２の
規定値よりも大きくなること、そして、第２の電圧値が
第１の電圧値よりも小さくなる条件を用いて余裕角を検
出するようにしているので、転流動作が完了しているこ
とを確実に判断した上で、余裕角検出を行っているの
で、短絡寸法等により余裕角検出失敗を起こすことがな
くなる。Further, in the control device for a power converter according to the present invention, the margin angle detecting means makes the first current detection value smaller than the first specified value, and the second current detection value becomes the second current detection value. The commutation operation is completed because the margin angle is detected under the condition that the second voltage value becomes larger than the specified value and the second voltage value becomes smaller than the first voltage value. Since the margin angle is detected after making a reliable judgment, the margin angle detection will not fail due to the short-circuit size or the like.
【００２３】さらに、本発明の余裕角検出手段によれ
ば、電力変換器への制御信号である点弧パルスが発生し
たことを条件に電力変換器の余裕角を検出するので転流
動作と関係のないところで誤った余裕角を検出すること
がなくなる。Further, according to the allowance angle detecting means of the present invention, the allowance angle of the power converter is detected on condition that an ignition pulse, which is a control signal to the power converter, is generated. There is no need to detect an erroneous allowance in a place where there is no.
【００２４】そして、第２の交流相の電圧が零点になっ
たことを検出した時点、または、第２の交流相の電圧検
出値が第１の交流相の電圧値よりも小さくなったことを
検出した時点、または第２の交流相を転流させる電力変
換器の制御信号としての点弧パルス信号を検出してから
所定の期間後に余裕角のサンプリングを行うので、異常
時に余裕角信号がゼロのままの場合でも余裕角がないこ
とを確実に検出できる。At the time when it is detected that the voltage of the second AC phase has reached the zero point, or when the detected voltage value of the second AC phase becomes smaller than the voltage value of the first AC phase. Since the margin angle is sampled after a predetermined period of time after the ignition pulse signal as the control signal of the power converter for commutating the second AC phase is detected at the time of detection, the margin angle signal is zero when an abnormality occurs. Even if it remains as it is, it can be surely detected that there is no margin.
【００２５】[0025]
【実施例】以下、本発明の実施例を図面を参照して説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００２６】図１は本発明を直流送電システムに適用し
た場合の構成図である。電力変換器３１は変換用変圧器
２１を介して交流系統１１に、電力変換器３２は変換用
変圧器２２を介して交流系統１２に接続されている。電
力変換器３１と３２は直流送電線５１，５２を介して接
続されており、直流送電線５１，５２の線路中には直流
リアクトル４１，４２が設けられている。FIG. 1 is a configuration diagram when the present invention is applied to a DC power transmission system. The power converter 31 is connected to the AC system 11 via the conversion transformer 21, and the power converter 32 is connected to the AC system 12 via the conversion transformer 22. The power converters 31 and 32 are connected via DC power transmission lines 51 and 52, and DC reactors 41 and 42 are provided in the lines of the DC power transmission lines 51 and 52.
【００２７】各電力変換器は、サイリスタ等の半導体素
子を用いた他励式の半導体素子からなる変換器で、それ
ぞれ制御装置から与えられる制御信号であるパルス点弧
信号に応じて半導体素子のサイリスタをＯＮ，ＯＦＦ
し、交流電力を直流電力に、あるいは直流電力を交流電
力に変換する。簡単のため図１には変換器３１の制御装
置７０のみを示すが、変換器３２用の制御装置も全く同
様に構成されているものとする。Each power converter is a converter composed of a separately excited semiconductor element using a semiconductor element such as a thyristor, and the thyristor of the semiconductor element is changed in accordance with a pulse firing signal which is a control signal given from the controller. ON, OFF
Then, the AC power is converted into DC power, or the DC power is converted into AC power. For simplicity, only the control device 70 of the converter 31 is shown in FIG. 1, but the control device for the converter 32 is also configured in exactly the same way.
【００２８】制御装置７０は、定電圧制御回路７１，定
電流制御回路７２，余裕角制御回路７４の３つから成
り、最小値選択回路７５によって最も小さい値が選択さ
れて制御角が決定される。位相制御回路７６は、決定さ
れた制御角をもとに各サイリスタバルブの点弧信号を作
成する。The control device 70 is composed of a constant voltage control circuit 71, a constant current control circuit 72 and a margin angle control circuit 74, and the minimum value selection circuit 75 selects the smallest value to determine the control angle. . The phase control circuit 76 creates an ignition signal for each thyristor valve based on the determined control angle.
【００２９】定電流制御回路７２は直流電流検出器６４
の出力をもとに、直流電流の検出値と設定した指令値と
の差を零にするような制御信号である制御角信号を出力
する。定電圧制御回路７１は直流電圧検出器６３の出力
をもとに、直流電圧の検出値と指令値との差が零になる
ように同様に制御を行う。通常、平常時には順変換器側
は定電流制御、逆変換器側は定電圧制御が選択されるよ
うにそれぞれ制御信号の指令値を設定する。The constant current control circuit 72 is a direct current detector 64.
Based on the output of, the control angle signal which is a control signal for making the difference between the detected value of the DC current and the set command value zero is output. The constant voltage control circuit 71 performs the same control based on the output of the DC voltage detector 63 so that the difference between the detected value of the DC voltage and the command value becomes zero. Normally, the command values of the control signals are set so that the constant current control is selected on the forward converter side and the constant voltage control is selected on the reverse converter side in normal times.
【００３０】余裕角制御回路７４は余裕角検出手段７３
から出力される余裕角検出値をもとに、余裕角と指令値
との差が零になるように制御を行うもので、特に交流系
統の事故などにより余裕角が不足した場合に余裕角を確
保し、転流失敗を防止するのが主な目的である。The allowance angle control circuit 74 is an allowance angle detecting means 73.
Based on the detected margin angle value output from the control, the control is performed so that the difference between the margin angle and the command value becomes zero.The margin angle is adjusted especially when the margin angle is insufficient due to an AC system accident. The main purpose is to secure and prevent commutation failure.
【００３１】余裕角検出手段７３は、変圧器電流検出器
６２が検出する変換用変圧器２１の変換器側に流れる電
流の値を電流検出手段により、交流電圧検出器６１が検
出する交流電圧の値を電圧検出手段により取り込み、こ
れらの値をもとに余裕角を算出して余裕角制御回路７４
に出力する。The margin angle detecting means 73 determines the value of the current flowing through the transformer side of the converting transformer 21 detected by the transformer current detector 62 by the current detecting means by the AC voltage detector 61 detecting the AC voltage. The value is taken in by the voltage detecting means, the margin angle is calculated based on these values, and the margin angle control circuit 74
Output to.
【００３２】図２に示すように、電力変換器３１は６つ
のサイリスタバルブ群（これらは１個又は複数のサイリ
スタ素子によって構成が可能）から成り、電流検出手段
である変圧器電流検出器６２と電圧検出手段である交流
電圧検出器６１は、それぞれ３相の電流，電圧値を検出
する。なお、これらの電流，電圧値は通常の変換器の制
御・保護回路で検出している値を用いても構成すること
ができる。As shown in FIG. 2, the power converter 31 is composed of six thyristor valve groups (which can be configured by one or a plurality of thyristor elements), and a transformer current detector 62 which is a current detecting means. The AC voltage detector 61, which is a voltage detecting means, detects currents and voltage values of three phases, respectively. It should be noted that these current and voltage values can be configured by using the values detected by a normal converter control / protection circuit.
【００３３】以下、図２に示した３相交流電力を使用し
た場合に第１の交流相としてバルブＵから第２の交流相
としてバルブＶに転流する場合を例にとって、余裕角の
検出方法を説明する。In the following, the margin angle detection method will be described by taking as an example the case where the three-phase AC power shown in FIG. 2 is used and the valve U as the first AC phase is commutated to the valve V as the second AC phase. Will be explained.
【００３４】バルブＵからバルブＶに転流する場合、図
３に示すように、まず、バルブＶに点弧パルスが入りバ
ルブＶがＯＮとなる。このとき、交流電圧はＵ相よりも
Ｖ相の方が高いためバルブＵには逆電圧がかかり、Ｕ相
に流れていた電流がＶ相に移る。バルブＵの電流が零と
なった時点でバルブＵはＯＦＦとなって、転流動作が完
了する。転流動作が完了してからバルブＵにかかる逆電
圧がなくなるまで、すなわちＵ相電圧よりもＶ相電圧が
低くなるまでの期間に相当する電気角が余裕角となる。When commutating from the valve U to the valve V, as shown in FIG. 3, first, an ignition pulse enters the valve V and the valve V is turned on. At this time, since the AC voltage is higher in the V phase than in the U phase, a reverse voltage is applied to the valve U, and the current flowing in the U phase shifts to the V phase. When the current of the valve U becomes zero, the valve U is turned off and the commutation operation is completed. The electrical angle corresponding to the period after the commutation operation is completed until the reverse voltage applied to the valve U disappears, that is, until the V-phase voltage becomes lower than the U-phase voltage is the margin angle.
【００３５】図４は、余裕角を検出するための回路例を
示したものである。まず、転流動作完了を判定するため
に、Ｕ相電流Ｉｕの大きさが第１の規定値のしきい値Ｉ
１よりも小さくなったかどうかを調べ、小さければ出力
Ｓ１＝１，そうでなければＳ１＝０とする。また、実際
に転流したことを確認するため、Ｖ相電流Ｉｖの大きさ
が第２の規定値のしきい値Ｉ２よりも大きくなったかど
うかを調べ、大きければ出力Ｓ２＝１，そうでなければ
Ｓ２＝０とする。Ｓ１とＳ２のＡＮＤをとって転流動作
完了の信号Ｓ３を出力する。FIG. 4 shows an example of a circuit for detecting the margin angle. First, in order to determine the completion of the commutation operation, the magnitude of the U-phase current Iu is the threshold value I of the first specified value.
It is checked whether or not it becomes smaller than 1, and if it is smaller, the output S1 = 1, and if not, S1 = 0. Further, in order to confirm that the commutation has actually occurred, it is checked whether or not the magnitude of the V-phase current Iv is larger than the threshold value I2 of the second specified value, and if it is larger, the output S2 = 1, otherwise it must be. For example, S2 = 0. The AND of S1 and S2 is taken and the signal S3 of commutation operation completion is output.
【００３６】転流失敗などにより直流短絡(たとえば図
２でバルブＵとバルブＸが共にＯＮ)となった場合、変
圧器に流れる電流は０となり、Ｓ１＝１となるが、Ｓ２
が０のためＳ３は１とならない。このように転流動作完
了の判定にＳ２を設けたことにより、直流短絡等の異常
時にも適切に転流動作完了したかどうかを判定できる。
しきい値Ｉ１については任意の値を取ることが可能であ
り、電流検出の精度をもとに値を決める。電流検出値の
誤差が±４０Ａ程度であれば、マージンをとって例えば
５０Ａとする。Ｉ２についても任意の値を取ることが可
能であり、たとえば運転状態として定格の１０％程度が
最小であれば、マージンをとって定格電流の５％程度と
する。定格電流が２０００Ａであれば１００Ａとなる。When a DC short circuit occurs (for example, both valve U and valve X are ON in FIG. 2) due to commutation failure, the current flowing through the transformer becomes 0, and S1 = 1, but S2
Since S is 0, S3 does not become 1. By providing S2 for the determination of the commutation operation completion in this way, it is possible to determine whether or not the commutation operation is properly completed even in the event of an abnormality such as a DC short circuit.
The threshold I1 can take any value, and is determined based on the accuracy of current detection. If the error of the detected current value is about ± 40 A, a margin is set, for example, 50 A. I2 can also take an arbitrary value. For example, if about 10% of the rating is the minimum in the operating state, a margin is set to about 5% of the rated current. If the rated current is 2000A, it becomes 100A.
【００３７】次に、逆電圧期間の判定を行う。第１の交
流相の電圧値であるＵ相電圧Ｅｕと第２の交流相の電圧
値であるＶ相電圧Ｅｖとを比較し、Ｅｖの方が大きけれ
ば出力Ｓ４＝１，そうでなければＳ４＝０とする。Next, the reverse voltage period is determined. The U-phase voltage Eu, which is the voltage value of the first AC phase, and the V-phase voltage Ev, which is the voltage value of the second AC phase, are compared. If Ev is larger, the output S4 = 1, otherwise S4. = 0.
【００３８】信号Ｓ５は、バルブＶ点弧パルスをもとに
作成する信号で、たとえば点弧パルス発生から任意の電
気角、例えば電気角９０゜の期間だけ１とする。これ
は、バルブＵからバルブＶへの転流に際しての余裕角だ
けを検出するために設けたもので、これにより、事故等
の異常時に転流と全く関係ないところでＳ３やＳ４が１
となった場合に、それを誤って余裕角として検出するの
を防止することができる。The signal S5 is a signal created based on the valve V ignition pulse, and is set to 1 only during a period of an arbitrary electrical angle, for example, an electrical angle of 90 ° from the generation of the ignition pulse. This is provided in order to detect only the margin angle at the time of commutation from the valve U to the valve V, so that S3 and S4 are set to 1 when there is no relation to commutation at the time of an abnormality such as an accident.
In this case, it can be prevented from being erroneously detected as the margin angle.
【００３９】Ｓ３，Ｓ４，Ｓ５の３つのＡＮＤをとって
余裕角信号Ｓ６とする。Ｓ６を積分したのがＳ７で、こ
れをサンプリングし、周波数×３６０゜倍することによ
り余裕角（電気角度）の値が算定できる。サンプリング
のタイミングは、たとえばＥｖ相の電圧がＥｕ相の電圧
よりも小さくなることを示すＳ６が１から０になると
き、または点弧パルスから任意の電気角を示す信号Ｓ５
が１から０になるときとする。通常はＳ６が０になった
ときだけで十分だが、転流失敗などで余裕角が０の場合
はＳ６が０のままなので、サンプリングのタイミングが
得られない。Ｓ５が０になるときにもサンプリングをす
るようにすれば、そのような場合にも対応できる。The three ANDs of S3, S4 and S5 are taken as the margin angle signal S6. The value of the margin angle (electrical angle) can be calculated by sampling S6 by integrating S6 and multiplying it by frequency × 360 °. The sampling timing is, for example, when S6 indicating that the voltage of the Ev phase becomes smaller than the voltage of the Eu phase changes from 1 to 0, or a signal S5 indicating an arbitrary electrical angle from the ignition pulse.
When 1 changes from 1 to 0. Normally, it is sufficient only when S6 becomes 0, but when the margin angle is 0 due to commutation failure or the like, S6 remains 0, and therefore the sampling timing cannot be obtained. If the sampling is performed even when S5 becomes 0, such a case can be dealt with.
【００４０】さらにはＥｖの電圧の零点を検出した後で
サンプリングを行うことによっても余裕角の値を算定す
ることができる。Furthermore, the value of the margin angle can also be calculated by sampling after detecting the zero point of the Ev voltage.
【００４１】なお、信号Ｓ７は適当なタイミング、たと
えばＳ５が０になるとき、またはＳ５が１になるときに
０にリセットしておく。The signal S7 is reset to 0 at an appropriate timing, for example, when S5 becomes 0 or S5 becomes 1.
【００４２】以上、バルブＵの余裕角検出方法について
述べたが、他の５つのバルブについても同様に検出す
る。６つのバルブの余裕角が余裕角制御回路７４に送ら
れて、余裕角制御が行われる。The method of detecting the allowance angle of the valve U has been described above, but the other five valves are also detected in the same manner. The allowance angles of the six valves are sent to the allowance angle control circuit 74, and allowance angle control is performed.
【００４３】このように、本発明によれば、通常の制御
・保護で用いる観測値のみを用いて容易に余裕角が検出
でき、しかも、直流短絡時等の異常時にも確実に余裕角
が検出できる効果がある。As described above, according to the present invention, the margin angle can be easily detected by using only the observed values used for normal control and protection, and the margin angle can be reliably detected even in the case of an abnormality such as a DC short circuit. There is an effect that can be done.
【００４４】[0044]
【発明の効果】本発明によれば、変換用変圧器の変換器
側電流と，交流系統の電圧を用いるだけで、特別な検出
器を設けることなく容易に余裕角が検出でき、しかも、
直流短絡等の異常時にも確実に余裕角の有無，大きさを
検出できる効果がある。According to the present invention, the margin angle can be easily detected without providing a special detector only by using the converter-side current of the conversion transformer and the voltage of the AC system, and moreover,
Even if there is an abnormality such as a DC short circuit, the presence or absence of the margin and its size can be reliably detected.
【図１】本発明を直流送電システムに適用したときの全
体構成図。FIG. 1 is an overall configuration diagram when the present invention is applied to a DC power transmission system.
【図２】電力変換器と変換用変圧器の詳細図。FIG. 2 is a detailed view of a power converter and a conversion transformer.
【図３】余裕角検出のタイミングを表す図。FIG. 3 is a diagram showing timing of margin angle detection.
【図４】余裕角検出回路例を示す図。FIG. 4 is a diagram showing an example of a margin angle detection circuit.
２１，２２…変換用変圧器、３１，３２…電力変換器、
６１…交流電圧検出器、６２…変圧器電流検出器、７０
…制御装置、７１…定電圧制御回路、７２…定電流制御
回路、７３…余裕角検出回路、７４…余裕角制御回路、
７５…最小値選択回路、７６…位相制御回路。21, 22 ... Transformer for conversion, 31, 32 ... Power converter,
61 ... AC voltage detector, 62 ... Transformer current detector, 70
... Control device, 71 ... Constant voltage control circuit, 72 ... Constant current control circuit, 73 ... Margin angle detection circuit, 74 ... Margin angle control circuit,
75 ... Minimum value selection circuit, 76 ... Phase control circuit.
フロントページの続き (72)発明者 天野 雅彦 茨城県日立市大みか町七丁目１番１号 株 式会社日立製作所日立研究所内 (72)発明者 小西 博雄 茨城県日立市大みか町七丁目１番１号 株 式会社日立製作所日立研究所内 (72)発明者 中村 知治 茨城県日立市国分町一丁目１番１号 株式 会社日立製作所国分工場内 (72)発明者 野林 正盛 大阪府大阪市北区中之島３丁目３番22号 関西電力株式会社内 (72)発明者 山地 幸司 香川県高松市丸の内２の５ 四国電力株式 会社内 (72)発明者 加藤 和男 東京都中央区銀座六丁目15番１号 電源開 発株式会社内Front Page Continuation (72) Inventor Masahiko Amano 7-1-1 Omika-cho, Hitachi City, Ibaraki Hitachi Ltd. Hitachi Research Laboratory (72) Inventor Hiroo Konishi 7-1-1 Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi Ltd., Hitachi Research Laboratory (72) Inventor Tomoji Nakamura 1-1-1, Kokubun-cho, Hitachi City, Ibaraki Prefecture Hitachi Co., Ltd. Kokubun Factory (72) Inventor Masamori Nobayashi 3 Nakanoshima, Kita-ku, Osaka-shi, Osaka 3-22 No. 22 Kansai Electric Power Co., Inc. (72) Inventor Koji Yamaji 2-5 Marunouchi, Takamatsu, Kagawa Shikoku Electric Power Co., Inc. (72) Inventor Kazuo Kato 6-15-1 Ginza, Chuo-ku, Tokyo Within the stock company
Claims (12)
統の間で、交流電力と直流電力との電力変換を行う電力
変換器の制御装置において、 前記複数交流相の内の第１の交流相の電流を検出する第
１の電流検出手段と、 第２の交流相の電流を検出する第２の電流検出手段とを
有し、 前記第１の交流相と前記第２の交流相との間で転流動作
を行う際に、前記第１の電流検出手段からの第１の電流
検出値が第１の規定値より小さくなり、かつ前記第２の
電流検出手段からの第２の電流検出値が第２の規定値よ
り大きくなることをもって第１の交流相と前記第２の交
流相との間の転流動作を検出する転流動作検出手段を備
えたことを特徴とする電力変換器の制御装置。1. A controller for a power converter that performs power conversion between AC power and DC power between a DC power system and an AC power system having a plurality of phases, wherein a first AC of the plurality of AC phases is provided. A first current detecting means for detecting a current of a phase and a second current detecting means for detecting a current of a second alternating phase; and a first alternating current phase and a second alternating current phase. The first current detection value from the first current detection means is smaller than the first specified value and the second current detection from the second current detection means is performed when the commutation operation is performed between them. A power converter comprising commutation operation detection means for detecting commutation operation between the first AC phase and the second AC phase when the value becomes larger than a second specified value. Control device.
統の間で、交流電力と直流電力との電力変換を行う電力
変換器の制御装置において、 前記複数交流相の内の第１の交流相の電圧を検出する第
１の電圧検出手段と、第２の交流相の電圧を検出する第
２の電圧検出手段とを有し、 かつ前記第１の交流相の電流を検出する第１の電流検出
手段と、前記第２の交流相の電流を検出する第２の電流
検出手段とを有し、 前記第１，第２の電圧検出手段からの電圧信号と前記第
１，第２の電流検出手段からの電流信号とを入力して、
前記第１の交流相と前記第２の交流相との間で転流動作
を行う前記電力変換器の余裕角を検出する余裕角検出手
段を備えたことを特徴とする電力変換器の制御装置。2. A controller for a power converter that performs power conversion between AC power and DC power between a DC power system and an AC power system having a plurality of phases, wherein a first AC of the plurality of AC phases is provided. A first voltage detecting means for detecting the voltage of the phase and a second voltage detecting means for detecting the voltage of the second AC phase; and a first voltage detecting means for detecting the current of the first AC phase. Current detection means and second current detection means for detecting the current of the second AC phase, and voltage signals from the first and second voltage detection means and the first and second currents. Input the current signal from the detection means,
A power converter control device comprising a margin angle detecting means for detecting a margin angle of the power converter performing a commutation operation between the first AC phase and the second AC phase. .
装置において、 前記余裕角検出手段は前記第１の電流検出手段からの第
１の電流検出値が第１の規定値より小さくなり、かつ前
記第２の電流検出手段からの第２の電流検出値が第２の
規定値より大きくなる条件と、前記第２の電圧検出手段
からの第２の電圧検出値が前記第１の電圧検出手段から
の第１の電圧検出値よりも小さくなる条件とを用いて前
記電力変換器の余裕角を検出することを特徴とする電力
変換器の制御装置。3. The control device for a power converter according to claim 2, wherein the margin angle detection means has a first current detection value from the first current detection means smaller than a first specified value. And the condition that the second current detection value from the second current detection means is larger than the second specified value, and the second voltage detection value from the second voltage detection means is the first A control device for a power converter, wherein a margin angle of the power converter is detected under the condition that the first voltage detection value from the voltage detection means is smaller than the first voltage detection value.
装置において、 前記余裕角検出手段は前記第２の交流相を転流する電力
変換器への制御信号を検出して前記電力変換器の余裕角
を検出することを特徴とする電力変換器の制御装置。4. The control device for a power converter according to claim 3, wherein the allowance angle detecting means detects the control signal to the power converter that commutates the second AC phase to detect the power. A control device for a power converter, which is characterized by detecting a margin angle of the converter.
装置において、 前記余裕角検出手段は前記制御信号を検出してから所定
の位相期間中であることを条件に前記電力変換器の余裕
角を検出することを特徴とする電力変換器の制御装置。5. The power converter control apparatus according to claim 4, wherein the margin angle detecting means detects the control signal and is in a predetermined phase period. A controller for a power converter, which is characterized by detecting an allowance angle.
制御装置において、 前記制御信号として前記第２の交流相を転流する電力変
換に入力される点弧パルスを用いたことを特徴とする電
力変換器の制御装置。6. The control device for a power converter according to claim 4, wherein an ignition pulse input to power conversion for commutating the second AC phase is used as the control signal. A control device for a power converter.
制御装置において、 前記余裕角検出手段は前記第２の電圧検出手段からの第
２の電圧検出値が前記第１の電圧検出手段からの第１の
電圧検出値よりも小さくなることを検出し、余裕角値を
サンプリングすることを特徴とする電力変換器の制御装
置。7. The control device for a power converter according to claims 2 and 3, wherein said margin angle detecting means has a second voltage detection value from said second voltage detecting means as said first voltage. A control device for a power converter, characterized in that it detects a value smaller than a first voltage detection value from a detection means and samples a margin angle value.
換器の制御装置において、 前記余裕角検出手段は前記第２の交流相の電圧値の零点
を検出した後で余裕角をサンプリングすることを特徴と
する電力変換器の制御装置。8. The control device for a power converter according to claim 2 or 3, wherein the allowance angle detecting means detects the allowance angle after detecting a zero point of the voltage value of the second AC phase. A power converter control device characterized by sampling.
制御装置において、 前記余裕角検出手段は前記制御信号を検出してから所定
の位相期間後に余裕角値をサンプリングすることを特徴
とする電力変換器の制御装置。9. The control device for a power converter according to claims 2 and 3, wherein the margin angle detecting means samples a margin angle value after a predetermined phase period after detecting the control signal. A control device for a characteristic power converter.
の制御装置において、 前記電力変換器として他励式の電力変換素子を備えたこ
とを特徴とする電力変換器の制御装置。10. The control device for a power converter according to claim 1, wherein the power converter includes a separately excited power conversion element as the power converter.
の制御装置において、 前記第１，第２の電流検出手段は前記電力変換器と，外
部からの複数相交流が伝達されうる変圧器との間に流れ
る電流状態を検出することを特徴とする電力変換器の制
御装置。11. The control device for a power converter according to claim 1, wherein the first and second current detecting means can transfer a plurality of phase alternating currents from the outside to the power converter. A control device for a power converter, which detects a current state flowing between the power converter and the transformer.
の制御装置において、 前記第１，第２の電流検出手段は前記電力変換器と，外
部からの複数相交流が伝達されうる変圧器との間に流れ
る電流状態を検出すること、 前記第１，第２の電圧検出手段は外部から前記変圧器に
かかりうる電圧状態を検出することを特徴とする電力変
換器の制御装置。12. The control device for a power converter according to claims 2 and 3, wherein the first and second current detection means can transmit a plurality of alternating currents from the outside to the power converter. A controller for a power converter, wherein a state of a current flowing between the transformer and a transformer is detected, and the first and second voltage detecting means detect a voltage state that can be applied to the transformer from the outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03968195A JP3554599B2 (en) | 1995-02-28 | 1995-02-28 | Control device for power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03968195A JP3554599B2 (en) | 1995-02-28 | 1995-02-28 | Control device for power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08237868A true JPH08237868A (en) | 1996-09-13 |
| JP3554599B2 JP3554599B2 (en) | 2004-08-18 |
Family
ID=12559839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03968195A Expired - Lifetime JP3554599B2 (en) | 1995-02-28 | 1995-02-28 | Control device for power converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3554599B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08237869A (en) * | 1995-02-28 | 1996-09-13 | Hitachi Ltd | Power converter |
| JP2007213962A (en) * | 2006-02-09 | 2007-08-23 | Kitashiba Electric Co Ltd | Induction heating device applicable to power supply higher-harmonic wave |
-
1995
- 1995-02-28 JP JP03968195A patent/JP3554599B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08237869A (en) * | 1995-02-28 | 1996-09-13 | Hitachi Ltd | Power converter |
| JP2007213962A (en) * | 2006-02-09 | 2007-08-23 | Kitashiba Electric Co Ltd | Induction heating device applicable to power supply higher-harmonic wave |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3554599B2 (en) | 2004-08-18 |
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