JP3883091B2 - Power regeneration inverter control method - Google Patents

Power regeneration inverter control method Download PDF

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Publication number
JP3883091B2
JP3883091B2 JP15833099A JP15833099A JP3883091B2 JP 3883091 B2 JP3883091 B2 JP 3883091B2 JP 15833099 A JP15833099 A JP 15833099A JP 15833099 A JP15833099 A JP 15833099A JP 3883091 B2 JP3883091 B2 JP 3883091B2
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Prior art keywords
power
regenerative
inverter
voltage
train
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Expired - Fee Related
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JP15833099A
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JP2000343987A (en
Inventor
博 篠原
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Fuji Electric Co Ltd
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Fuji Electric Systems Co Ltd
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【０００１】
【発明の属する技術分野】
この発明は、電気車からの回生電力を電力系統に回生する電力回生インバータの制御方法に関する。
【０００２】
【従来の技術】
図２に電力回生インバータが設置される電力系統例図を示す。
同図において、１，８は電力系統、２，７，９は変圧器、３は整流器、４はき電線、５は直流電車、６は電力回生インバータ、１４はリアクトルである。
すなわち、同図には直流電車５の力行電力を電力系統１から供給するための整流器３と、直流電車５からの回生電力を電力系統８に回生する電力回生インバータ６とが示されている。電力系統１から直流電車５へ電力を供給する場合、電力系統１から変圧器２を介し整流器３で交流から直流に変換し、き電線４を介して直流電車５へ直流電力を供給する。
【０００３】
直流電車５では図３のように，き電線４からの直流電力をパンタグラフ１０，コンデンサ１１を介して電力変換器１２をインバータ動作させることにより、モータ１３を駆動する。また、直流電車５が減速する場合はモータ１３を発電動作させ、電力変換器１２を整流器動作させて、き電線４に電力を回生する（回生ブレーキ）。
【０００４】
ここで、直流電車５からの回生電力は他の直流電車に供給されることが多いが、他の直流電車が電力を必要としない場合は、この回生電力によって直流電圧が上昇することで回生ブレーキ失効となり問題となるため、電力回生インバータ６で交流に変換し、変圧器７を介して電力系統８に回生する。
【０００５】
図４,図５に電力回生インバータの構成例を示す。
図４はサイリスタ１５ａ〜１５ｂで構成された他励式インバータの例であり、また、図５はＧＴＯやＩＧＢＴのような自己消弧型半導体素子２２ａ〜２２ｂ、ダイオード２３ａ〜２３ｆおよびコンデンサ２４等で構成された自励式インバータの例である。
【０００６】
電力回生インバータの制御回路例を図６に示す。同図は、電力回生インバータが自励式インバータの場合の制御回路例である。
ここで、電力系統１から直流電車５に電力を供給している場合は、調節器３４を零ホールドして電力回生インバータ６を停止している。次に、直流電車５の回生電力を電力系統８に回生する場合は、直流電車５の回生ブレーキによりき電電圧Ｅｄが上昇し運転開始電圧Ｅｄｏｎに達すると、電力回生インバータ６は運転を開始し、調節器３４の零ホールドを解除して、直流電圧がＥｄ*となるような出力電流指令値Ｉ*を演算することで、直流電車５からの回生電力を電力系統８に回生する。そして、直流電車５からの回生電力がなくなり、き電電圧ＥｄがＥｄｏｎ以下になると、調節器３４を零ホールドして電力回生インバータ６は停止することになる。
【０００７】
【発明が解決しようとする課題】
図６のリアクトル１４は、電力回生インバータの内部短絡事故時の電流変化率（ｄｉ／ｄｔ）を抑制するとともに、入力フィルタとして設けられているため、電力回生インバータの運転停止はき電電圧Ｅｄで制御し、電力回生インバータはＥｄｉを制御することになる。このように、制御対象であるき電電圧と制御するＥｄｉはリアクトルを介することで同値にはならず、回生電流によってはき電電圧Ｅｄが運転開始電圧Ｅｄｏｎより高くなったり、低くなったりすることがあり、電力回生インバータ６は回生電流があるにも関わらず停止することがあり、安定に電力系統８に回生することができないという問題がある。
したがって、この発明の課題は電力回生時の動作を安定に行ない得るようにすることにある。
【０００８】
【課題を解決するための手段】
このような課題を解決するため、この発明では、電気車からの回生電力を電力系統に回生する電力回生インバータを制御するに当たり、
前記電気車の回生制動によってき電線電圧が一定値以上になった時、および電力回生インバータの入力端子間に接続されたコンデンサを介して流れる回生電流が一定値以上になった時のいずれの時にも電力回生インバータを運転させ、き電線電圧が一定値以下で、かつ回生電流が一定値以下になった時は電力回生インバータを停止させるように制御することを特徴とする。
【０００９】
【発明の実施の形態】
図１はこの発明の実施の形態を示す構成図である。
同図からも明らかなように、図６に示すものに対しコンパレータ３６、オア（ＯＲ）回路３７、電流検出器３８および設定器３９等を付加して構成される。すなわち、電流検出器３８で回生電流Ｉｄを検出し、これをコンパレータ３６において、設定器３９に設定された設定値Ｉｄｏｎと大小比較するとともに、電圧検出器３１でき電電圧Ｅｄを検出し、これをコンパレータ３５において、設定器３３に設定された設定値Ｅｄｏｎと大小比較し、これらの比較結果をＯＲ回路３７に入力して運転指令を演算する。ここでは、回生電流Ｉｄが設定値Ｉｄｏｎより大きい場合は“Ｈ”を、き電電圧Ｅｄが設定値Ｅｄｏｎより大きい場合は“Ｈ”をそれぞれ出力し、電力回生インバータ６は“Ｈ”で運転、“Ｌ”で停止するものとする。
【００１０】
したがって、検出された回生電流Ｉｄが設定値Ｉｄｏｎより大きい、検出されたき電電圧Ｅｄが設定値Ｅｄｏｎより大きい、の少なくとも一方が成立すれば、ＯＲ回路３７により運転指令が演算され、調節器３４の零ホールドを解除して運転することで、直流電圧ＥｄがＥｄ*となるように制御され、たとえき電電圧Ｅｄが設定値Ｅｄｏｎ以下となっても、ＯＲ回路３７にて運転指令が演算される限りは、運転が継続される。そして、回生電流Ｉｄが設定値Ｉｄｏｎより小さい、検出されたき電電圧Ｅｄが設定値Ｅｄｏｎより小さい、の双方がともに成立すれば調節器３４を零ホールドして停止することになる。
このように、電力回生インバータ６の運転，停止をき電電圧と回生電流にもとづき制御することにより、回生電力を安定に電力系統８に回生することが可能となる。
【００１１】
【発明の効果】
この発明によれば、電力回生インバータの運転，停止をき電電圧と回生電流にもとづき制御するようにしたので、回生電流があるにも関わらず電力回生インバータ６を停止させるような不都合を回避することができる。
【図面の簡単な説明】
【図１】この発明の実施の形態を示す構成図である。
【図２】電力回生インバータシステムの一般的な例を示す構成図である。
【図３】従来の直流電車の例を示す概要図である。
【図４】電力回生インバータの一般的な例を示す回路図である。
【図５】電力回生インバータの別の一般的な例を示す回路図である。
【図６】従来の電力回生インバータの制御回路例を示す構成図である。
【符号の説明】
１，８…電力系統、２，７，９…変圧器、１０…パンタグラフ、３…整流器、４…き電線、５…直流電車、６…電力回生インバータ、６ａ…他励式インバータ、６ｂ…自励式インバータ、１１，２４…コンデンサ、１２…電力変換器、１３…モータ、１４…リアクトル、１５ａ〜１５ｂ…サイリスタ、２２ａ〜２２ｂ…自己消弧型半導体素子、２３ａ〜２３ｆ…ダイオード、３０，３１…直流電圧検出器、３２…減算器、３３，３９…設定器、３４…調節器、３５，３６…コンパレータ、３７…オア（ＯＲ）回路、３８…電流検出器。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for controlling a power regenerative inverter that regenerates regenerative power from an electric vehicle to a power system.
[0002]
[Prior art]
FIG. 2 shows an example of a power system in which a power regeneration inverter is installed.
In the figure, 1 and 8 are power systems, 2, 7 and 9 are transformers, 3 is a rectifier, 4 feeders, 5 is a DC train, 6 is a power regeneration inverter, and 14 is a reactor.
That is, the figure shows a rectifier 3 for supplying power running power of the DC train 5 from the power system 1 and a power regenerative inverter 6 for regenerating the regenerative power from the DC train 5 to the power system 8. When power is supplied from the power system 1 to the DC train 5, the power is converted from AC to DC by the rectifier 3 via the transformer 2 and DC power is supplied to the DC train 5 via the feeder 4.
[0003]
In the DC train 5, as shown in FIG. 3, the motor 13 is driven by causing the power converter 12 to invert the DC power from the feeder 4 via the pantograph 10 and the capacitor 11. Further, when the DC train 5 decelerates, the motor 13 is operated to generate power, and the power converter 12 is operated as a rectifier to regenerate power to the feeder 4 (regenerative braking).
[0004]
Here, the regenerative power from the DC train 5 is often supplied to other DC trains, but when the other DC trains do not require power, the regenerative brake is caused by the DC voltage rising by the regenerative power. Since it becomes invalid and becomes a problem, it is converted into alternating current by the power regenerative inverter 6 and regenerated to the power system 8 via the transformer 7.
[0005]
4 and 5 show configuration examples of the power regeneration inverter.
FIG. 4 shows an example of a separately excited inverter composed of thyristors 15a to 15b. FIG. 5 shows a self-extinguishing type semiconductor element 22a to 22b such as GTO or IGBT, diodes 23a to 23f, a capacitor 24, and the like. This is an example of a self-excited inverter.
[0006]
A control circuit example of the power regeneration inverter is shown in FIG. This figure is an example of a control circuit when the power regeneration inverter is a self-excited inverter.
Here, when power is supplied from the power system 1 to the DC train 5, the regulator 34 is held at zero and the power regeneration inverter 6 is stopped. Next, when the regenerative power of the DC train 5 is regenerated to the power system 8, when the feeding voltage Ed rises due to the regenerative brake of the DC train 5 and reaches the operation start voltage Edon, the power regeneration inverter 6 starts operation. Then, by releasing the zero hold of the regulator 34 and calculating the output current command value I * such that the DC voltage becomes Ed * , the regenerative power from the DC train 5 is regenerated to the power system 8. When there is no regenerative power from the DC train 5 and the feeding voltage Ed becomes equal to or less than Edon, the regulator 34 is held at zero and the power regenerative inverter 6 is stopped.
[0007]
[Problems to be solved by the invention]
The reactor 14 of FIG. 6 suppresses the current change rate (di / dt) at the time of an internal short-circuit accident of the power regeneration inverter and is provided as an input filter. And the power regenerative inverter will control Edi. In this way, the feeding voltage to be controlled and the controlled Edi do not become the same value through the reactor, and the feeding voltage Ed may become higher or lower than the operation start voltage Edon due to the regenerative current. In addition, there is a problem that the power regenerative inverter 6 may stop despite the presence of the regenerative current and cannot be stably regenerated in the power system 8.
Therefore, an object of the present invention is to enable stable operation during power regeneration.
[0008]
[Means for Solving the Problems]
In order to solve such a problem, in the present invention, in controlling the power regeneration inverter that regenerates the regenerative power from the electric vehicle to the power system,
When the wire voltage can by the regenerative braking of the electric vehicle is a certain value or more, and when any of when a regenerative current flowing through a capacitor connected between the input terminal of the power regeneration inverter is a certain value or more The power regeneration inverter is operated, and the power regeneration inverter is controlled to stop when the feeder voltage is less than a certain value and the regeneration current is less than a certain value.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing an embodiment of the present invention.
As is apparent from FIG. 6, a comparator 36, an OR circuit 37, a current detector 38, a setting device 39 and the like are added to the configuration shown in FIG. That is, the regenerative current Id is detected by the current detector 38, and this is compared with the set value Idon set in the setter 39 by the comparator 36, and the voltage detector 31 can detect the electric voltage Ed and The comparator 35 compares the set value Edon set in the setter 33 with a magnitude, inputs these comparison results to the OR circuit 37, and calculates an operation command. Here, when the regenerative current Id is greater than the set value Idon, “H” is output, and when the feeding voltage Ed is greater than the set value Edon, “H” is output, and the power regenerative inverter 6 is operated at “H”. It shall be stopped at “L”.
[0010]
Therefore, if at least one of the detected regenerative current Id is greater than the set value Idon and the detected feed voltage Ed is greater than the set value Edon, the operation command is calculated by the OR circuit 37, and the controller 34 By operating after releasing the zero hold, the DC voltage Ed is controlled to be Ed *, and even if the electric voltage Ed becomes equal to or less than the set value Edon, the OR circuit 37 calculates the operation command. As long as the operation continues. If both the regenerative current Id is smaller than the set value Idon and the detected feeding voltage Ed is smaller than the set value Edon, the controller 34 is held at zero and stopped.
Thus, by controlling the operation and stop of the power regenerative inverter 6 based on the feeding voltage and the regenerative current, it becomes possible to stably regenerate the regenerated power in the power system 8.
[0011]
【The invention's effect】
According to the present invention, since the operation and stop of the power regeneration inverter are controlled based on the feeding voltage and the regeneration current, the inconvenience of stopping the power regeneration inverter 6 despite the presence of the regeneration current is avoided. be able to.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of the present invention.
FIG. 2 is a configuration diagram showing a general example of a power regeneration inverter system.
FIG. 3 is a schematic diagram showing an example of a conventional DC train.
FIG. 4 is a circuit diagram showing a general example of a power regeneration inverter.
FIG. 5 is a circuit diagram showing another general example of a power regeneration inverter.
FIG. 6 is a block diagram showing an example of a control circuit of a conventional power regeneration inverter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,8 ... Electric power system, 2, 7, 9 ... Transformer, 10 ... Pantograph, 3 ... Rectifier, 4 ... Feed wire, 5 ... DC train, 6 ... Electric power regenerative inverter, 6a ... Other excitation type inverter, 6b ... Self-excitation type Inverter, 11, 24 ... Capacitor, 12 ... Power converter, 13 ... Motor, 14 ... Reactor, 15a-15b ... Thyristor, 22a-22b ... Self-extinguishing semiconductor element, 23a-23f ... Diode, 30, 31 ... DC Voltage detector, 32 ... subtractor, 33, 39 ... setter, 34 ... regulator, 35, 36 ... comparator, 37 ... OR circuit, 38 ... current detector.

Claims (1)

電気車からの回生電力を電力系統に回生する電力回生インバータを制御するに当たり、
前記電気車の回生制動によってき電線電圧が一定値以上になった時、および電力回生インバータの入力端子間に接続されたコンデンサを介して流れる回生電流が一定値以上になった時のいずれの時にも電力回生インバータを運転させ、き電線電圧が一定値以下で、かつ回生電流が一定値以下になった時は電力回生インバータを停止させるように制御することを特徴とする電力回生インバータの制御方法。In controlling the power regenerative inverter that regenerates the regenerative power from the electric vehicle to the power grid,
When the wire voltage can by the regenerative braking of the electric vehicle is a certain value or more, and when any of when a regenerative current flowing through a capacitor connected between the input terminal of the power regeneration inverter is a certain value or more The power regenerative inverter is controlled so that the power regenerative inverter is stopped when the feeder voltage is below a certain value and the regenerative current is below a certain value. .
JP15833099A 1999-06-04 1999-06-04 Power regeneration inverter control method Expired - Fee Related JP3883091B2 (en)

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JP2005070611A (en) * 2003-08-27 2005-03-17 Oki Electric Ind Co Ltd Speech synthesizing method
KR100629428B1 (en) * 2004-12-24 2006-09-27 한국철도기술연구원 DC power supply system of electromotivecar for reusing energy
KR100865167B1 (en) 2006-12-19 2008-10-24 한국철도기술연구원 Control method of regenerative inverter in current substation
DE102006062424B4 (en) * 2006-12-27 2009-02-12 Siemens Ag Method for regenerating electrical energy of rail vehicles
JP2011079454A (en) * 2009-10-08 2011-04-21 Toshiba Corp Power system for electric railway
JP6132753B2 (en) * 2013-12-05 2017-05-24 三菱電機株式会社 Station building power supply

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