JP3441906B2 - DC transmission line protection device - Google Patents
DC transmission line protection deviceInfo
- Publication number
- JP3441906B2 JP3441906B2 JP00358597A JP358597A JP3441906B2 JP 3441906 B2 JP3441906 B2 JP 3441906B2 JP 00358597 A JP00358597 A JP 00358597A JP 358597 A JP358597 A JP 358597A JP 3441906 B2 JP3441906 B2 JP 3441906B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- transmission line
- power
- voltage
- signal filter
- 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.)
- Expired - Lifetime
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- Emergency Protection Circuit Devices (AREA)
- Direct Current Feeding And Distribution (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は直流送電線の保護装
置に係り、特にケーブルに流れる充電電流による誤動作
を防ぎ、かつ内部事故を高速に検出するのに好適な直流
送電線の保護装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC power transmission line protection device, and more particularly to a DC power transmission line protection device suitable for preventing malfunction due to a charging current flowing through a cable and for detecting an internal accident at high speed.
【０００２】[0002]
【従来の技術】直流送電線の本線の地絡事故を高速に検
出する保護装置としては、各端子の直流電流の差電流に
よって判定する方式が有効である。しかし、直流送電線
の経路中にケーブル区間を含む場合、ケーブルの対地静
電容量により事故発生直後に充電電流が流れ、それがそ
のまま差電流として現れるため、外部事故等に誤動作と
なる可能性がある。そこで、充電電流を計算して差電流
から差し引き、誤動作を防止する方式が提案されてい
る。2. Description of the Related Art As a protective device for detecting a ground fault in the main line of a direct current transmission line at high speed, a method of making a determination by a difference current of direct currents at respective terminals is effective. However, when a cable section is included in the route of the DC transmission line, the charging current flows immediately after the accident due to the electrostatic capacitance of the cable to the ground, and it appears as a difference current as it is, so there is a possibility of malfunction due to an external accident, etc. is there. Therefore, a method has been proposed in which the charging current is calculated and subtracted from the difference current to prevent malfunction.
【０００３】充電電流ＩC は、ケーブル端の直流電圧を
ＶC 、ケーブルの静電容量をＣとしてCharging current I C is a DC voltage at the cable end is V C , and a capacitance of the cable is C
【０００４】[0004]
【数１】 [Equation 1]
【０００５】で計算できる。ただし、実際のディジタル
計算では微分をサンプル値の差分で計算するため誤差が
生じる。特に事故発生時の高い周波数の電圧変動に対し
て誤差が大きくなる。It can be calculated by However, in the actual digital calculation, an error occurs because the differential is calculated by the difference between the sample values. In particular, the error becomes large with respect to high-frequency voltage fluctuations when an accident occurs.
【０００６】そこで、従来では特開平5−268717 号に記
載のように、直流電流の変化分に応じた抑制量を計算
し、抑制量により誤動作を防止する方式が提案されてい
る。これは、例えば１０ｍｓ間の電流の変化量を算出
し、各端子での電流変化の最大値を抑制量とし、差電流
から抑制量を差し引いた値をもとに動作判定を行うとい
うものである。Therefore, conventionally, as described in Japanese Patent Application Laid-Open No. 5-268717, a method has been proposed in which a suppression amount is calculated according to a change amount of a direct current and a malfunction is prevented by the suppression amount. In this method, for example, the amount of change in current for 10 ms is calculated, the maximum value of current change at each terminal is set as the suppression amount, and the operation determination is performed based on the value obtained by subtracting the suppression amount from the difference current. .
【０００７】[0007]
【発明が解決しようとする課題】充電電流の計算誤差を
抑制量で計算する方式では、直流電流変化分を算出する
処理が別に必要になり、また各端子の電流変化の最大を
とる場合には電流変化量を端子間で通信する必要があ
り、処理量や通信量が増えるという問題があった。ま
た、抑制係数を適切に設定しないと正確な事故判定がで
きなくなるという問題があった。In the method of calculating the charging current calculation error with the suppression amount, a separate process for calculating the DC current change is required, and in the case of maximizing the current change at each terminal, It is necessary to communicate the amount of change in current between terminals, which causes a problem that the amount of processing and the amount of communication increase. Further, there is a problem that an accurate accident determination cannot be performed unless the suppression coefficient is properly set.
【０００８】本発明の目的は、抑制量を計算したり通信
したりすることなく、簡単な方法で充電電流の計算誤差
を低減し、誤動作がなくかつ高速に事故検出ができる直
流送電線の保護装置を提供することにある。An object of the present invention is to protect a DC power transmission line which can reduce an error in calculation of a charging current by a simple method without calculating a suppression amount or communicating and can detect an accident at high speed without malfunction. To provide a device.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に、本発明では直流電力系統を介して、２つの交流電力
系統間で、交流電力を直流電力に変換して送電する直流
送電線の保護装置において、直流送電線の電圧を検出す
る電圧検出手段と、直流送電線の電流を検出する電流検
出手段と、電圧検出手段からの電圧信号をフィルタ処理
する電圧信号フィルタ手段と、電流検出手段からの電流
信号をフィルタ処理する電流信号フィルタ手段と、電圧
信号フィルタ手段からの電圧信号と、電流信号フィルタ
手段からの電流信号を基に充電電流補償量を算出する充
電電流算出手段と、直流電力系統の自端と相手端との直
流電流の差電流と、充電電流補償量とから求めた動作量
が、所定のリレー感度よりも大きい時に送電線事故と判
定する動作判定手段とを備えたことを特徴としたもので
ある。In order to achieve the above object, according to the present invention, there is provided a DC transmission line for converting AC power into DC power and transmitting the power between two AC power systems via the DC power system. In the protection device, voltage detection means for detecting the voltage of the DC transmission line, current detection means for detecting the current of the DC transmission line, voltage signal filter means for filtering the voltage signal from the voltage detection means, and current detection means Current signal filter means for filtering the current signal from the current signal, the voltage signal from the voltage signal filter means, the charging current calculation means for calculating the charging current compensation amount based on the current signal from the current signal filter means, and the DC power An operation determination method for determining a transmission line fault when the operation amount obtained from the difference current of the DC current between the self-end and the other end of the system and the charging current compensation amount is larger than the predetermined relay sensitivity. It is obtained by comprising the and.
【００１０】また、電圧信号フィルタ手段，電流信号フ
ィルタ手段としてはたとえば高周波除去フィルタを用い
るようにした。Further, as the voltage signal filter means and the current signal filter means, for example, a high frequency removing filter is used.
【００１１】充電電流の計算誤差は高域になるほど大き
くなるので、高周波除去フィルタで電流や電圧の高域成
分をあらかじめ低減しておけば、計算誤差も小さくなり
誤動作が回避できる。なお、内部事故時には事故電流に
よる大きな差電流が現れるため、高周波除去フィルタを
設けても事故判定に要する時間はそれほど大きくならな
い。Since the calculation error of the charging current becomes higher as the frequency becomes higher, if the high frequency component of the current or voltage is reduced in advance by the high frequency removing filter, the calculation error becomes small and the malfunction can be avoided. In addition, since a large difference current due to the accident current appears at the time of an internal accident, even if the high frequency elimination filter is provided, the time required for the accident determination does not become so long.
【００１２】また、各端子ごとに充電電流補償計算を行
い、補償した電流のみを他の端子に通信するようにし
た。他の端子から送られている電流値はすでに充電電流
分が補償された値なので、あとは差電流を求めるだけで
よく、端子間の通信量を最小限とすることができる。Further, the charging current compensation calculation is performed for each terminal, and only the compensated current is communicated to the other terminals. Since the current values sent from the other terminals have already been compensated for the charging current, it is only necessary to find the difference current, and the amount of communication between the terminals can be minimized.
【００１３】[0013]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
【００１４】図２は本発明の一実施例の直流送電システ
ムの構成図である。Ａ端側の電力変換器３３は変換用変
圧器３５を介して交流系統３７に、Ｂ端側の電力変換器
３４は変換用変圧器３６を介して交流系統３８にそれぞ
れ接続されている。電力変換器３３と３４は架空送電線
１１，１３，２１，２３およびケーブル送電線１２，２
２を介して接続されており、それぞれ制御装置５５，５
６によって制御される。なお直流送電線は、架空送電線
１１，１３，２１，２３とケーブル送電線１２，２２と
から構成されておりケーブル送電線には対地静電容量Ｃ
が存在する構成となっている。FIG. 2 is a block diagram of a DC power transmission system according to an embodiment of the present invention. The power converter 33 on the A end side is connected to an AC system 37 via a conversion transformer 35, and the power converter 34 on the B end side is connected to an AC system 38 via a conversion transformer 36. The power converters 33 and 34 include overhead power lines 11, 13, 21, 23 and cable power lines 12, 2 respectively.
2 and are connected to each other through control devices 55 and 5 respectively.
Controlled by 6. The DC power transmission line is composed of overhead power transmission lines 11, 13, 21, 23 and cable power transmission lines 12, 22.
Is configured to exist.
【００１５】Ａ端側には保護装置５１が設置されてお
り、直流電流検出器４１と直流電圧検出器４３によって
検出された電流値，電圧値と伝送装置５３からの信号を
もとに事故判定を行う。事故と判定した場合は制御装置
５５に動作信号を送出し、制御装置５５はゲートブロッ
クなど保護シーケンスに従った制御を行う。Ｂ端側にも
同様に保護装置５２，直流電流検出器４２，直流電圧検
出器４４，伝送装置５４が設置されている。伝送装置５
３，５４はそれぞれの端子の電流値や計算結果などを他
の端子の制御装置へ伝送する。A protective device 51 is installed at the end A, and an accident judgment is made based on the current value and voltage value detected by the DC current detector 41 and the DC voltage detector 43 and the signal from the transmission device 53. I do. When it is determined that an accident has occurred, an operation signal is sent to the control device 55, and the control device 55 performs control such as a gate block according to a protection sequence. Similarly, a protection device 52, a DC current detector 42, a DC voltage detector 44, and a transmission device 54 are installed on the B end side. Transmission device 5
Reference numerals 3 and 54 transmit the current value of each terminal and the calculation result to the control device of another terminal.
【００１６】以下、本発明の一実施例の保護装置５１の
処理ブロックの詳細について図１を用いて説明する。な
お、保護装置５２も同様に構成される。Details of the processing blocks of the protection device 51 according to an embodiment of the present invention will be described below with reference to FIG. The protection device 52 has the same structure.
【００１７】まず、測定された直流電流と直流電圧の値
を入力し、入力処理部６１でサンプリング及びＡＤ変換
を行う。サンプリングの前には通常、折り返し誤差除去
用のフィルタを設けるが、これは主にサンプリング周波
数付近の帯域を減衰させるものであり、以下に述べる充
電電流補償誤差低減用のフィルタとは特性が異なる。次
に、サンプリングされた電圧，電流値の高周波成分をロ
ーパスフィルタ６２によって低減させる。これは、充電
電流補償誤差を低減するためのものであり、特性として
は例えば図３（ａ）に示すような一次遅れ要素を用い
る。時定数を１０ｍｓとすると、たとえば３６０Ｈｚで
の減衰は約２７デシベル（約０.０４倍）となり、３６
０Ｈｚで振動する充電電流が流れた場合、リレー感度の
２５倍までであればその影響を抑えて誤動作を防止する
ことができる。First, the measured DC current and DC voltage values are input, and the input processing unit 61 performs sampling and AD conversion. Before sampling, a filter for removing aliasing error is usually provided, but this filter mainly attenuates the band near the sampling frequency, and has characteristics different from those of the filter for reducing charging current compensation error described below. Next, the high frequency components of the sampled voltage and current values are reduced by the low pass filter 62. This is for reducing the charging current compensation error, and for example, a first-order delay element as shown in FIG. 3A is used as the characteristic. If the time constant is 10 ms, the attenuation at 360 Hz is about 27 decibels (about 0.04 times), which is 36
When a charging current that oscillates at 0 Hz flows, up to 25 times the relay sensitivity can suppress the effect and prevent malfunction.
【００１８】なお、これらのフィルタ手段をディジタル
フィルタで構成することも可能であり、上述のフィルタ
に相当するようなディジタルフィルタを採用できる。図
３（ｂ）は図３（ａ）のアナログフィルタに相当するデ
ィジタルフィルタを双一次変換により構成した例であ
る。Incidentally, these filter means can be constituted by digital filters, and digital filters corresponding to the above-mentioned filters can be adopted. FIG. 3B is an example in which a digital filter corresponding to the analog filter of FIG. 3A is configured by bilinear conversion.
【００１９】次に充電電流計算部６３で充電電流を計算
する。充電電流ＩC は、ケーブル端の直流電圧ＶC とケ
ーブルの静電容量Ｃとから数１のように計算できる。Next, the charging current calculator 63 calculates the charging current. The charging current I C can be calculated from the DC voltage V C at the cable end and the electrostatic capacitance C of the cable as in Formula 1.
【００２０】[0020]
【数２】 [Equation 2]
【００２１】上記の図１に示す系統のようにケーブル端
と電圧計測点との間に架空送電線（インダクタンス
ＬA ）がある場合、ケーブル端の電圧ＶC は以下に示す
数３となり、充電電流は以下に示す数４のように直流電
流ＩA と直流電圧ＶA とから計算される。When there is an overhead power transmission line (inductance L A ) between the cable end and the voltage measurement point as in the system shown in FIG. 1 above, the voltage V C at the cable end becomes Equation 3 shown below and charging is performed. The electric current is calculated from the direct current I A and the direct current voltage V A as shown in Equation 4 below.
【００２２】[0022]
【数３】 [Equation 3]
【００２３】[0023]
【数４】 [Equation 4]
【００２４】なお、ディジタル処理の場合には、微分の
計算を例えば数５のように差分で近似計算することにな
る。In the case of digital processing, the differential calculation is approximated by the difference as shown in, for example, Equation 5.
【００２５】[0025]
【数５】 [Equation 5]
【００２６】Δｔはサンプリング間隔で、これが大きい
ほど差分による近似の誤差が大きくなる。Δt is a sampling interval, and the larger it is, the larger the approximation error due to the difference becomes.
【００２７】次に、数６に示すように直流電流ＩA から
この充電電流ＩC を差し引き、補償後の電流ＩACを求め
る。Next, as shown in equation 6, this charging current I C is subtracted from the direct current I A to obtain the compensated current I AC .
【００２８】[0028]
【数６】
ＩAC＝ＩA−ＫAＩC …（５）
ここで、ＫA はＡ端での充電電流の補償率（０≦ＫA ≦
１）である。[Equation 6] I AC = I A −K A I C (5) Here, K A is the compensation ratio of the charging current at the A end (0 ≦ K A ≦
1).
【００２９】この充電電流補償された直流電流ＩAcはサ
ンプル＆ホールド回路６４でサンプリングされ、伝送装
置５３により他端に伝送される。The charging current-compensated DC current I Ac is sampled by the sample & hold circuit 64 and transmitted to the other end by the transmission device 53.
【００３０】また、他端においても同様に補償後の電流
ＩBCを求めることができ、動作判定部６５は、自端での
電流ＩAcと他端から伝送装置５３，５４を介して送られ
てきた電流ＩBCとを用いて数７により動作判定する。Similarly, the compensated current I BC can be obtained at the other end as well, and the operation determining section 65 sends the current I Ac at its own end and the other end through the transmission devices 53 and 54. The operation is determined by the equation 7 using the received current I BC .
【００３１】[0031]
【数７】
｜ＩAC＋ＩBC｜＞Ｋ0 …（６）
筒、この時Ｋ0 はリレー感度である。判定式が成立した
場合には動作信号を制御装置５５に送出する。## EQU7 ## | I AC + I BC |> K 0 (6) Tube, where K 0 is the relay sensitivity. When the determination formula is satisfied, an operation signal is sent to the control device 55.
【００３２】このように他端から伝送される電流値は、
既に充電電流補償された値であるため、動作判定部では
単にそれらを足し合わせるだけでよい。これにより、端
子間での通信量を最小限に抑えられる効果がある。Thus, the current value transmitted from the other end is
Since the values have already been compensated for the charging current, the operation determination unit only needs to add them. This has the effect of minimizing the amount of communication between the terminals.
【００３３】また、通信の際には伝送容量の制約から大
きめのサンプリング間隔となる場合が多い。その場合で
も、伝送用のサンプル＆ホールド回路６４の前の段階で
充電電流を計算するため、小さいサンプリング間隔で計
算することができ、差分近似による誤差を小さくできる
という効果がある。Further, in the case of communication, a large sampling interval is often used due to the restriction of transmission capacity. Even in that case, since the charging current is calculated before the transmission sample-and-hold circuit 64, it is possible to calculate the charging current at a small sampling interval and to reduce the error due to the difference approximation.
【００３４】本発明の効果を図４に示す。直流送電線の
保護区間外で事故が発生した場合、ＬＣ共振により直流
電圧は振動し、ケーブルにも充電電流が流れる。Ａ端，
Ｂ端の直流電流の差電流をとると、充電電流がそのまま
差電流に現れて、図４（ａ）のように点線で示す動作レ
ベル（リレー感度）をはるかにオーバーし、誤って内部
事故と判定してしまう。The effect of the present invention is shown in FIG. When an accident occurs outside the protection section of the DC power transmission line, the DC voltage oscillates due to LC resonance, and the charging current also flows in the cable. A edge,
When the difference current of the DC current at the B end is taken, the charging current appears in the difference current as it is, and the operation level (relay sensitivity) shown by the dotted line in Fig. 4 (a) is far exceeded, resulting in an internal accident. I will judge.
【００３５】充電電流の計算を行いその分を補償量とし
て差電流から差し引くと、図４(ｂ)に示すように電流値
はかなり小さくなるが、補償誤差が残るためやはり動作
レベルを少しオーバーする。When the charging current is calculated and the difference is subtracted from the difference current as the compensation amount, the current value becomes considerably small as shown in FIG. 4 (b), but the compensation level remains and the operation level is slightly exceeded. .
【００３６】次に、ローパスフィルタによりあらかじめ
振動成分を低減しておいて充電電流補償を行えば、図４
（ｃ）に示すように電流値を動作レベル以下に抑えるこ
とができ、誤動作を避けることができる。Next, if the vibration component is reduced in advance by a low-pass filter and the charging current is compensated,
As shown in (c), the current value can be suppressed below the operation level, and malfunction can be avoided.
【００３７】保護区間内の事故の場合には、ローパスフ
ィルタをかけることにより電流の立ち上がりがゆるやか
になり、動作判定までの時間が少し遅れることになる。
しかし、通常、事故時の電流は大きいため差電流も大き
く、ローパスフィルタによって立ち上がりがゆるやかに
なっても、動作判定に要する時間はそれほど大きくなら
ず、十分に高速な動作判定が可能である。In the case of an accident in the protection zone, a low-pass filter is applied to make the rise of the current gentle, and the time until the operation determination is delayed a little.
However, since the current at the time of an accident is usually large, the difference current is also large, and even if the rise is moderated by the low-pass filter, the time required for the operation determination is not so long and the operation determination can be performed sufficiently fast.
【００３８】[0038]
【発明の効果】本発明によれば、直流送電線の保護装置
において、充電電流の計算誤差を簡便な方法で低減し、
外部事故時の誤動作を防ぐことができ、また内部事故時
にも高速に動作判定できるという効果がある。また、抑
制量の計算が不要で、端子間の通信量も最小限に抑える
ことができるという効果がある。According to the present invention, in the protection device of the DC transmission line, the calculation error of the charging current is reduced by a simple method,
This has the effect of preventing malfunctions in the event of an external accident and enabling high-speed motion determination even in the event of an internal accident. Further, there is an effect that the calculation of the suppression amount is unnecessary and the communication amount between terminals can be suppressed to the minimum.
【図１】本発明による保護装置の構成図。FIG. 1 is a block diagram of a protection device according to the present invention.
【図２】本発明を適用した直流送電システムの構成図。FIG. 2 is a configuration diagram of a DC power transmission system to which the present invention is applied.
【図３】ローパスフィルタのブロック図。FIG. 3 is a block diagram of a low pass filter.
【図４】本発明の効果の説明図。FIG. 4 is an explanatory diagram of effects of the present invention.
１１，１３，２１，２３…架空送電線、１２，２２…ケ
ーブル送電線、３３，３４…電力変換器、４１，４２…
直流電流検出手段、４３，４４…直流電圧検出手段、５
１，５２…保護装置、５３，５４…伝送装置、５５，５
６…制御装置、６１…入力処理部、６２…ローパスフィ
ルタ、６３…充電電流計算部、６４…サンプル＆ホール
ド回路、６５…動作判定部。11, 13, 21, 23 ... Overhead power transmission line, 12, 22 ... Cable power transmission line, 33, 34 ... Power converter, 41, 42 ...
DC current detecting means, 43, 44 ... DC voltage detecting means, 5
1, 52 ... Protecting device, 53, 54 ... Transmission device, 55, 5
6 ... Control device, 61 ... Input processing part, 62 ... Low pass filter, 63 ... Charging current calculation part, 64 ... Sample & hold circuit, 65 ... Operation determination part.
───────────────────────────────────────────────────── 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 吉栖 立格 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 東 正樹 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 植原 宣和 香川県高松市丸の内２番５号 四国電力 株式会社内 (72)発明者 本庄 暢之 東京都中央区銀座六丁目15番１号 電源 開発株式会社内 (56)参考文献 特開 平７−322489（ＪＰ，Ａ) 特開 平５−268717（ＪＰ，Ａ) 特開 平７−177657（ＪＰ，Ａ) 特開 平６−86457（ＪＰ，Ａ) 特公 平１−13292（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) H02H 3/26 H02J 1/00 H02J 3/36 H02J 5/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiko Amano 7-1-1, Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi Research Laboratory (72) Inventor Hiroo Konishi 7-1-1, Omika-cho, Hitachi-shi, Ibaraki No. 1 Hitachi Ltd. within Hitachi Research Laboratory (72) Inventor Ritsukazu Yoshisu 1-1-1 Kokubuncho, Hitachi City, Ibaraki Prefecture Incorporated company Hitachi Ltd. Kokubun Factory (72) Inventor Masaki Higashi Kita, Osaka City, Osaka Prefecture 3-3-22 Nakanoshima-ku, Kansai Electric Power Co., Inc. (72) Inventor Nowakazu Uehara 2-5, Marunouchi, Takamatsu City, Kagawa Shikoku Electric Power Co., Ltd. (72) Nobuyuki Honjo 6-15, Ginza, Chuo-ku, Tokyo No. 1 Power Source Development Co., Ltd. (56) Reference JP-A-7-322489 (JP, A) JP-A-5-268717 (JP, A) JP-A-7-177657 (JP, A) JP-A-6-86457 (JP, A) JP-B-1-13292 (JP, B2) (58) Fields investigated (Int.Cl. 7 , DB name) H02H 3/26 H02J 1/00 H02J 3 / 36 H02J 5/00
Claims (4)
統間で、 交流電力を直流電力に変換して送電する直流送電線の保
護装置において、 前記直流送電線の電圧を検出する電圧検出手段と、 前記直流送電線の電流を検出する電流検出手段と、 前記電圧検出手段からの電圧信号をフィルタ処理する電
圧信号フィルタ手段と、 前記電流検出手段からの電流信号をフィルタ処理する電
流信号フィルタ手段と、 前記電圧信号フィルタ手段からの電圧信号と、前記電流
信号フィルタ手段からの電流信号を基に充電電流補償量
を算出する充電電流算出手段と、 前記直流電力系統の自端と相手端との直流電流の差電流
と、前記充電電流補償量とから求めた動作量が、所定の
リレー感度よりも大きい時に送電線事故と判定する動作
判定手段とを備え、 前記電圧信号フィルタ手段は、前記直流送電線の充電電
流の振動周波数成分を低減させるものであることを特徴
とする直流送電線の保護装置。1. A DC transmission line protection device for converting AC power into DC power and transmitting the DC power between two AC power systems via a DC power system, the voltage detection detecting voltage of the DC transmission line. Means, current detection means for detecting the current of the DC transmission line, voltage signal filter means for filtering the voltage signal from the voltage detection means, and current signal filter for filtering the current signal from the current detection means Means, a voltage signal from the voltage signal filter means, a charging current calculation means for calculating a charging current compensation amount based on a current signal from the current signal filter means, and a self-end and a partner end of the DC power system. And an operation determination means for determining a transmission line fault when the operation amount obtained from the DC current difference current and the charging current compensation amount is larger than a predetermined relay sensitivity, Voltage signal filter means, charging electric of the DC power transmission line
A device for protecting a direct current power transmission line, characterized in that it reduces a vibration frequency component of a flow .
統間で、 交流電力を直流電力に変換して送電する直流送電線の保
護装置において、 前記直流送電線の電圧を検出する電圧検出手段と、 前記直流送電線の電流を検出する電流検出手段と、 前記電圧検出手段からの電圧信号をフィルタ処理する電
圧信号フィルタ手段と、 前記電流検出手段からの電流信号をフィルタ処理する電
流信号フィルタ手段と、 前記電圧信号フィルタ手段からの電圧信号と、前記電流
信号フィルタ手段からの電流信号を基に充電電流補償量
を算出する充電電流算出手段と、 前記直流電力系統の自端と相手端との直流電流の差電流
と、前記充電電流補償量とから求めた動作量が、所定の
リレー感度よりも大きい時に送電線事故と判定する動作
判定手段とを備え、 前記電流信号フィルタ手段は、前記直流送電線の充電電
流の振動周波数成分を低減させるものであることを特徴
とする直流送電線の保護装置。2. A DC transmission line protection device for converting AC power into DC power and transmitting the DC power between two AC power systems via a DC power system, wherein the voltage detection detects the voltage of the DC transmission line. Means, current detection means for detecting the current of the DC transmission line, voltage signal filter means for filtering the voltage signal from the voltage detection means, and current signal filter for filtering the current signal from the current detection means Means, a voltage signal from the voltage signal filter means, a charging current calculation means for calculating a charging current compensation amount based on a current signal from the current signal filter means, and a self-end and a partner end of the DC power system. And an operation determination means for determining a transmission line fault when the operation amount obtained from the DC current difference current and the charging current compensation amount is larger than a predetermined relay sensitivity, Current signal filter means, charging electric of the DC power transmission line
A device for protecting a direct current power transmission line, characterized in that it reduces a vibration frequency component of a flow .
統間で、 交流電力を直流電力に変換して送電する直流送電線の保
護装置において、 前記直流送電線の電圧を検出する電圧検出手段と、 前記直流送電線の電流を検出する電流検出手段と、 前記電圧検出手段からの電圧信号をフィルタ処理する電
圧信号フィルタ手段と、 前記電流検出手段からの電流信号をフィルタ処理する電
流信号フィルタ手段と、 前記電圧信号フィルタ手段からの電圧信号と、前記電流
信号フィルタ手段からの電流信号を基に充電電流補償量
を算出する充電電流算出手段と、 前記直流電力系統の自端と相手端との直流電流の差電流
と、前記充電電流補償量とから求めた動作量が、所定の
リレー感度よりも大きい時に送電線事故と判定する動作
判定手段とを備え、 前記電流信号フィルタ手段及び前記電圧信号フィルタ手
段は、前記直流送電線の振動周波数成分を低減させるも
のであることを特徴とする直流送電線の保護装置。3. A DC transmission line protection device for converting AC power into DC power and transmitting the DC power between two AC power systems via a DC power system, the voltage detection detecting the voltage of the DC transmission line. Means, current detection means for detecting the current of the DC transmission line, voltage signal filter means for filtering the voltage signal from the voltage detection means, and current signal filter for filtering the current signal from the current detection means Means, a voltage signal from the voltage signal filter means, a charging current calculation means for calculating a charging current compensation amount based on a current signal from the current signal filter means, and a self-end and a partner end of the DC power system. And an operation determination means for determining a transmission line fault when the operation amount obtained from the DC current difference current and the charging current compensation amount is larger than a predetermined relay sensitivity, Current signal filter means and said voltage signal filter means, also reduces the vibration frequency component of said DC transmission line
A protection device for a DC power transmission line, characterized in that
統間で、 交流電力を直流電力に変換して送電する直流送電線の保
護装置において、 前記直流送電線の電圧を検出する電圧検出手段と、 前記直流送電線の電流を検出する電流検出手段と、 前記電圧検出手段からの電圧信号をフィルタ処理する電
圧信号フィルタ手段と、 前記電流検出手段からの電流信号をフィルタ処理する電
流信号フィルタ手段と 、 前記電圧信号フィルタ手段からの電圧信号と、前記電流
信号フィルタ手段からの電流信号を基に充電電流補償量
を算出する充電電流算出手段と、 前記直流電力系統の自端と相手端との直流電流の差電流
と、前記充電電流補償量とから求めた動作量が、所定の
リレー感度よりも大きい時に送電線事故と判定する動作
判定手段とを備え、 前記充電電流補償量は各端子ごとに各端子で測定した直
流電圧をもとに計算し、各端子ごとに直流電流から前記
補償量を差し引いて、差し引いた値を他の端子に通信す
ることを特徴とする直流送電線の保護装置。4. Two alternating current power systems via a direct current power system.
In order to maintain DC transmission lines that convert AC power to DC power and transmit it,
In the protection device, voltage detection means for detecting the voltage of the DC transmission line, current detection means for detecting the current of the DC transmission line, and an electric current for filtering the voltage signal from the voltage detection means.
A pressure signal filter means and an electric current filter for filtering the current signal from the current detecting means.
Current signal filter means, the voltage signal from the voltage signal filter means, and the current
Charge current compensation amount based on the current signal from the signal filter means
Charging current calculation means for calculating, and the difference current of the DC current between the self-end and the other end of the DC power system
And the operating amount obtained from the charging current compensation amount is
Operation to judge a transmission line accident when it is larger than the relay sensitivity
The charging current compensation amount is calculated based on the DC voltage measured at each terminal for each terminal, the compensation amount is subtracted from the DC current for each terminal, and the subtracted value A protective device for a DC power transmission line, characterized by communicating with a terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00358597A JP3441906B2 (en) | 1997-01-13 | 1997-01-13 | DC transmission line protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00358597A JP3441906B2 (en) | 1997-01-13 | 1997-01-13 | DC transmission line protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10201079A JPH10201079A (en) | 1998-07-31 |
| JP3441906B2 true JP3441906B2 (en) | 2003-09-02 |
Family
ID=11561541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00358597A Expired - Lifetime JP3441906B2 (en) | 1997-01-13 | 1997-01-13 | DC transmission line protection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3441906B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT505079B1 (en) * | 2007-03-21 | 2011-09-15 | Siemens Ag | METHOD FOR RECONSTRUCTING A TROUBLE-REDUCED PERIODIC VOLTAGE SIGNAL |
| EP3154144B1 (en) | 2015-10-06 | 2020-04-22 | General Electric Technology GmbH | Improvements in or relating to direct current distance protection controllers |
| WO2019043752A1 (en) * | 2017-08-28 | 2019-03-07 | 株式会社東芝 | Power conversion device |
-
1997
- 1997-01-13 JP JP00358597A patent/JP3441906B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10201079A (en) | 1998-07-31 |
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