JPH0223038A - Parallel operation unit for generator - Google Patents
Parallel operation unit for generatorInfo
- Publication number
- JPH0223038A JPH0223038A JP63168982A JP16898288A JPH0223038A JP H0223038 A JPH0223038 A JP H0223038A JP 63168982 A JP63168982 A JP 63168982A JP 16898288 A JP16898288 A JP 16898288A JP H0223038 A JPH0223038 A JP H0223038A
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- Japan
- Prior art keywords
- circuit
- generator
- parallel operation
- signal
- frequency
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 238000010586 diagram Methods 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004092 self-diagnosis Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
Landscapes
- Protection Of Generators And Motors (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は複数の発電機を並行運転させる発電機の並行
運転装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a generator parallel operation device for operating a plurality of generators in parallel.
第５図は例えば特開昭５９−３６４９３号公報に示され
た従来の並行運転装置を示す回路図であリ、図において
、ｌａ、ｌｂは発電機、２ａ、２ｂは発電機１ａ、ｌｂ
を駆動する原動機、３ａ。FIG. 5 is a circuit diagram showing a conventional parallel operation device disclosed in, for example, Japanese Unexamined Patent Publication No. 59-36493. In the figure, la and lb are generators, 2a and 2b are generators 1a and lb.
3a.
３ｂは発電機１ａ、ｌｂの母線に設けた遮断器、４は母
線連絡線に設けた遮断器、１６ａ、１６ｂは母線に接続
された負荷、１７は発電機１ａ、１ｂを並行運転する並
行運転制御装置であり、この並行運転制御装置１７は発
電機１ａ、ｌｂの有効電力検出１１１８ａ、１８ｂ、各
発電機１ａ、ｌｂの有効電力から１台当りの平均有効電
力を求める平均回路１９．各発電機１ａ、ｌｂの有効電
力と平均回路１９の平均値とを比較する演算増幅回路２
０ａ、２０ｂとで構成されている。3b is a circuit breaker installed on the bus of the generators 1a and 1b, 4 is a circuit breaker installed on the bus connection line, 16a and 16b are loads connected to the bus, and 17 is a parallel operation in which the generators 1a and 1b are operated in parallel. This parallel operation control device 17 includes active power detection 1118a, 18b of the generators 1a, lb, and an averaging circuit 19. which calculates the average active power per unit from the active power of each generator 1a, lb. Operational amplifier circuit 2 that compares the active power of each generator 1a, lb with the average value of the average circuit 19
It is composed of 0a and 20b.
次に動作について説明する。いま、発電機１ａと１ｂが
任意力率の負荷１６ａ、１６ｂを取り、並行運転してい
るとし、有効電力検出器１８ａ。Next, the operation will be explained. Assume that generators 1a and 1b are operating in parallel with loads 16a and 16b having arbitrary power factors, and active power detector 18a.
１８ｂの出力をＶａ、Ｖｂ、平均回路１９の出力をＶＭ
とすると、演算増幅器２０ａ、２０ｂの入力Ｖｒａ、Ｖ
ｒｂは次式で示されるようにセットされている。The output of 18b is Va, Vb, the output of average circuit 19 is VM
Then, the inputs Vra and V of the operational amplifiers 20a and 20b are
rb is set as shown by the following equation.
Ｖｒａ ＝＝ Ｖａ −ＶＭ
−・・’ （１）Ｖｒｂ＝Ｖｂ ｖ１４
・・・・・・（２）
従って、（３）式を（１）、（２）に代入すると
Ｖａ−Ｖｂ
Ｖｒａ＝：
Ｖｂ−Ｖａ
Ｖｒｂ＝
となる。Vra == Va −VM
-...' (1) Vrb=Vb v14 (2) Therefore, by substituting equation (3) into (1) and (2), Va-Vb Vra=: Vb-Va Vrb= .
一方、演算増幅ｌＩ２０ａ、２０ｂは入力Ｖｒａ。On the other hand, the operational amplifiers lI20a and 20b have an input Vra.
Ｖｒｂが零のときのみ、出力が零になるように構成され
ている。従って１発電機１ａの有効電力Ｖａが発電機１
ｂの有効電力ｖｂより大の時、即ち。The output is configured to be zero only when Vrb is zero. Therefore, the active power Va of 1 generator 1a is
When the effective power of b is greater than vb, that is.
Ｖａ）Ｖｂのときは、演算増幅器２０ａの出力信号は、
プラスのため、Ｈ動機２ａは発電機１ａの速度を減少さ
せる方向に作動し、また、演算増幅器２０ｂの出力信号
は、マイナスのため、原動機２ｂは発電機１ｂの速度を
増加させる方向に作動して、各発電機１ａ、ｌｂの有効
電力を平均化、即ち、有効電力分担を行うものである。Va) When Vb, the output signal of the operational amplifier 20a is
Since the signal is positive, the H motor 2a operates in the direction of decreasing the speed of the generator 1a, and since the output signal of the operational amplifier 20b is negative, the prime mover 2b operates in the direction of increasing the speed of the generator 1b. In other words, the active power of each of the generators 1a and 1b is averaged, that is, the active power is shared.
従来の並行運転装置は以上のように構成されているので
、並行運転制御装置の故障は並行運転できないばかりか
、電源喪失などの重大事故にもなりかねない、また、並
行運転される発電機が複数の場合は、並列運転中の発電
機の検出が困難で別途、並行運転機検出装置が必要であ
り、並行運転される発電機が離れて設置される場合は、
アナログ入力回路、ディジタル出力回路などの信号線が
多く、これら信号線の断線、短絡などの事故による並行
運転失敗及び電源の停止が懸念される。更に電圧設定器
（図示せず）の設定値が異なる場合は、無効電力の不平
衡が発生するなどの問題点があった。Conventional parallel operation devices are configured as described above, so a failure in the parallel operation control device not only prevents parallel operation, but also can lead to serious accidents such as loss of power, and the generators operated in parallel may If there are multiple generators operating in parallel, it is difficult to detect them and a separate parallel operating device detection device is required.If the generators operating in parallel are installed separately,
There are many signal lines such as analog input circuits and digital output circuits, and there are concerns that parallel operation failure and power outage may occur due to accidents such as disconnection or short circuit of these signal lines. Furthermore, if the set values of the voltage setters (not shown) are different, there are problems such as unbalanced reactive power.
この発明は上記のような問題点を解消するためになされ
たもので、並行運転中の発電機の検出を自動化すると共
に、並行運転制御装置の故障及び信号線の断線・短絡で
も並行運転を継続でき、かつ、信号線の少数化と短縮化
および電圧設定器の設定値の違いによる無効電力の不平
衡を解決する並行運転装置を得ることを目的とする。This invention was made to solve the above-mentioned problems, and it automates the detection of generators running in parallel, and also allows parallel operation to continue even if the parallel operation control device fails or the signal line is disconnected or short-circuited. The object of the present invention is to obtain a parallel operation device that can reduce the number and shorten the number of signal lines and solve unbalanced reactive power due to differences in setting values of voltage setting devices.
〔課題嵩を解決するための野山
この発明に係る発電機の並行運転装置は、当該発電機に
おける電力系統の遮断器の入・切信号は直接、他の並行
運転中の発電機における電力系統の遮断器の入・切信号
は断線短絡検出回路を介して入力するディジタル入力回
路と、当該発電機の電圧、周波数、有効電力、無効電力
は直接、他の並行運転中の発電機の有効電力、無効電力
は断線短絡検出回路を介して入力するアナログ入力回路
と、前記ディジタル入力回路および前記アナログ入力回
路の出力信号に基づいて、当該発電機が並行運転中か否
かを判別するとともに負荷分担時の当該発電機の設定有
効電力および設定無効電力を演算する演算回路と、前記
演算回路の出力信号に基づいて当該発電機を駆動する原
動機のガバナ設定器に周波数増減信号を、また、当該発
電機の自動電圧調整器の設定器に電圧増減信号を出力し
、設定器の設定値も自動追従させるとともに前記デイジ
タル入力回路および前記アナログ入力回路の断線短絡時
あるいは並行運転装置故障時は該ガバナおよび該自動電
圧調整器への前記増減信号出力を停止し該ガバナおよび
該自動電圧調整器を基準周波数および基準電圧に設定す
る基準周波数設定回路および基準電圧設定回路へ信号を
出力するディジタル出力回路を有し、正常発電機側で定
周波数、定電圧、有効電力分担および無効電力分担の制
御を続行する並行運転制御装置を、前記各発電機の夫々
・に対応して設けたものである。[Noyama for Solving the Problems] In the parallel operation device for generators according to the present invention, the on/off signal of the circuit breaker of the power system in the generator is directly transmitted to the power system of the other generators operating in parallel. The circuit breaker on/off signal is input through a digital input circuit via a disconnection/short circuit detection circuit, and the voltage, frequency, active power, and reactive power of the generator are directly input to the active power of other generators operating in parallel, The reactive power is determined by an analog input circuit that is input via a disconnection/short circuit detection circuit, and the output signals of the digital input circuit and the analog input circuit to determine whether or not the generator is in parallel operation, and also to determine whether the generator is in parallel operation or not. an arithmetic circuit that calculates the set active power and the set reactive power of the generator; and a frequency increase/decrease signal to the governor setting device of the prime mover that drives the generator based on the output signal of the arithmetic circuit; A voltage increase/decrease signal is output to the setting device of the automatic voltage regulator, and the setting value of the setting device is automatically followed, and when the digital input circuit and the analog input circuit are disconnected or short-circuited, or when the parallel operation device fails, the governor and the It has a digital output circuit that outputs a signal to a reference frequency setting circuit and a reference voltage setting circuit that stop outputting the increase/decrease signal to the automatic voltage regulator and set the governor and the automatic voltage regulator to a reference frequency and a reference voltage. A parallel operation control device that continues control of constant frequency, constant voltage, active power sharing, and reactive power sharing on the normal generator side is provided corresponding to each of the generators.
この発明における並行運転装置は、当該発電機の電圧１
周波数、有効電力、無効電力を検出し。The parallel operation device in this invention has a voltage of 1
Detects frequency, active power, and reactive power.
これと予め演算回路に設定された基準の電圧、周波数お
よび該演算回路で演算された設定有効電力。This, the reference voltage and frequency set in advance in the calculation circuit, and the set active power calculated by the calculation circuit.
設定無効電力とを比較し、当該発電機のガバナと自動電
圧調整器への出力は、夫々これ等の周波数と有効電力お
よび電圧と無効電力の偏差が減少する場合のみに出力し
、前記偏差が増加する場合には出力しないようにしたこ
とにより、並行運転制御装置の故障および信号線の断線
短絡でも並行運転を継続でき、かつ、信号線の小数化と
短縮化および無効電力の不平衡を解決することを可能と
する。Comparing the set reactive power with the set reactive power, the output to the governor and automatic voltage regulator of the generator will be output only when the deviations of frequency and active power and voltage and reactive power respectively decrease, and when the deviation is By not outputting when the signal line increases, parallel operation can be continued even if the parallel operation control device fails or the signal line is disconnected or short-circuited, and the number of signal lines is reduced and shortened, and the unbalance of reactive power is solved. make it possible to
以下、この発明の一実施例を図について説明する。第１
図において、１−１ａ、１−１ｂは発電機１ａ、ｌｂの
自動電圧調整器（以下、ＡＶＲと略称する）、２−１ａ
、２−１ｂは原動機２ａ。An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1-1a and 1-1b are automatic voltage regulators (hereinafter abbreviated as AVR) for generators 1a and 1b, and 2-1a
, 2-1b is the prime mover 2a.
２ｂに設けられたガバナ、３−１ａ、３−１ｂは発電機
用遮断器３ａ、３ｂの補助接点、４−１ｐ。A governor provided at 2b, 3-1a and 3-1b are auxiliary contacts of generator circuit breakers 3a and 3b, and 4-1p.
４−１ｂは母線連結用遮断器４ａ、４ｂの補助接点、５
ａ、５ｂは変流器、６ａ、６ｂは変圧器、７ａ、７ｂは
信号線を延長するためのアナログ信号変換器であり、通
常、出力電流の正常範囲は４〜２０ｍＡであるｅ ８ａ
、８ｂはディジタル入力回路（以下、Ｄ／Ｉ回路と略称
する）、９ａ、９ｂはＤ／Ｉ回路入力の断線・短絡検出
回路であり、接点の近くで、接点に直列および並列に抵
抗（図示せず）を接続し、通常Ｄ／Ｉ接点の開でも閉と
識別しない程度の約数ｍＡを、また閉でも、直列抵抗に
て限流された電流を流し、この電流の喪失および増大で
断線・短絡を検出する回路、１０ａ。4-1b is an auxiliary contact of the busbar connection circuit breaker 4a, 4b;
a, 5b are current transformers, 6a, 6b are transformers, 7a, 7b are analog signal converters for extending the signal line, and the normal range of output current is usually 4-20mA e 8a
, 8b is a digital input circuit (hereinafter abbreviated as D/I circuit), and 9a and 9b are D/I circuit input disconnection/short circuit detection circuits. (not shown) is connected, and normally a current of several mA that cannot be distinguished as closed when the D/I contact is open is passed, and a current limited by a series resistor is passed even when the contact is closed, and the loss or increase of this current will cause a disconnection. - Circuit for detecting short circuit, 10a.
１０ｂはアナログ入力回路（以下、Ａ／Ｉ回路と略称す
る）、ｌｌａ、ｌｌｂはＡ／Ｉ回路入力の断線短絡検出
回路であり、前記アナログ信号変換器７ａ、７ｂの出力
の正常筒１！ （４〜２０ ｍ Ａ ）外で断線・短絡
を検出する。１２ａ、１２ｂは制御動作のほか自己診断
機能による並行運転装置の故障検知と異常処理を行う演
算回路、１３ａ、１３ｂはディジタル出力回路（以下、
Ｄ１０回路と略称する）、１４ａ、１４ｂ又は１５ａ、
１５ｂはＤ１０回路１３ａ、１３ｂのワンパルスで瞬時
に基準電圧又は基準周波数となるように、ＡＶＲｌ−１
ａ、１−１ｂ又はガバナ２−１ａ、２−１ｂに作用する
基準電圧設定回路又は基準周波数設定回路である。１７
ａ又は１７ｂは上記部材７ａ〜１５ａまたは７ｂ〜１５
ｂにより構成された発電機１ａ又は１ｂの並行運転制御
装置である。10b is an analog input circuit (hereinafter abbreviated as A/I circuit), lla and llb are disconnection/short circuit detection circuits for the A/I circuit input, and normal cylinder 1! of the outputs of the analog signal converters 7a and 7b is detected. (4 to 20 mA) Detect disconnections and short circuits outside. 12a and 12b are arithmetic circuits that perform not only control operations but also failure detection and abnormality processing of the parallel operation device using a self-diagnosis function; 13a and 13b are digital output circuits (hereinafter referred to as
(abbreviated as D10 circuit), 14a, 14b or 15a,
15b is AVRl-1 so that the reference voltage or reference frequency can be instantaneously achieved by one pulse of the D10 circuits 13a and 13b.
a, 1-1b or a reference voltage setting circuit or a reference frequency setting circuit that acts on the governors 2-1a, 2-1b. 17
a or 17b is the above member 7a to 15a or 7b to 15
This is a parallel operation control device for the generator 1a or 1b configured by the generator 1a or 1b.
なお、上記の変流器５ａ、５ｂおよび変圧器６ａ、６ｂ
と断線短絡検出回路１１ａ、ｌｌｂ間の信号線の断線短
絡検出を行うのに、断線短絡検出回路１１ａ、ｌｌｂで
変流器５ａ、５ｂおよび変圧器６ａ、６ｂの２次側デー
タのみを常時監視しても、断線短絡は通常の発電機停止
時と同じく。In addition, the above-mentioned current transformers 5a, 5b and transformers 6a, 6b
In order to detect disconnections and shorts in the signal lines between the and disconnection/short circuit detection circuits 11a and llb, the disconnection and short circuit detection circuits 11a and llb constantly monitor only the secondary side data of current transformers 5a and 5b and transformers 6a and 6b. However, the disconnection and short circuit are the same as when the generator is stopped.
出力が零となり区別がつかず検出が出来ない。The output becomes zero, making it impossible to distinguish and detect.
そこで、変流器５ａ、５ｂおよび変圧器６ａ。Therefore, current transformers 5a, 5b and transformer 6a.
６ｂの近くにアナログ信号変換器７ａ、７ｂをおき、こ
のアナログ信号変換器７ａ、７ｂの出力信号は発電機停
止時にも数ｍＡまたは数Ｖを出力するよう構成しておく
、アナログ信号変換器７ａ。Analog signal converters 7a and 7b are placed near the analog signal converter 6b, and the output signals of the analog signal converters 7a and 7b are configured to output several mA or several V even when the generator is stopped. .
７ｂと断線短絡検出回路１１ａ、ｌｌｂ間の信号線に断
線・短絡が発生すると、断線短絡検出回路１１ａ、ｌｌ
ｂの入力は零となるため断線短絡の検出が可能となる。When a disconnection or short circuit occurs in the signal line between 7b and the disconnection/short circuit detection circuit 11a, llb, the disconnection/short circuit detection circuit 11a, llb
Since the input of b becomes zero, it becomes possible to detect a disconnection or short circuit.
上記の断線短絡検出回路１１ａ、ｌｌｂとアナログ入力
回路１０ａ、１０ｂの違いは、前者の回路１１ａ、ｌｌ
ｂでは断線・短絡のみ識別検出し、後者の回路１０ａ、
１０ｂでは通常のアナログ入力データを検出するもので
ある。The difference between the above-mentioned disconnection/short circuit detection circuits 11a, llb and the analog input circuits 10a, 10b is that the former circuits 11a, llb
In b, only disconnections and short circuits are identified and detected, and the latter circuit 10a,
10b detects normal analog input data.
また、変流器５ａ、５ｂおよび変圧器６ａ、６ｂとアナ
ログ信号変換器７ａ、７ｂは近くに設置されるため、こ
の間の断線・短絡は考慮しない。Further, since the current transformers 5a, 5b, the transformers 6a, 6b, and the analog signal converters 7a, 7b are installed close to each other, disconnections and short circuits between them are not considered.
第２図はこの発明の周波数一定制御及び有効電力分担制
御の不感帯を示す図であり、第２図において、Ｆｓは基
準周波数Ｈ２、±ΔＦは周波数不感帯Ｈｚ、Ｐｓは基準
有効電力ｋＷ、±ΔＰは有効電力不感帯Ｋｗである。FIG. 2 is a diagram showing the dead zone of constant frequency control and active power sharing control of the present invention. In FIG. 2, Fs is the reference frequency H2, ±ΔF is the frequency dead zone Hz, Ps is the reference active power kW, and ±ΔP. is the active power dead zone Kw.
第３図はこの発明の電圧一定制御及び無効電力分担制御
の不感帯を示す図であり、第３図において、Ｖｓは基準
電圧Ｖ、±ΔＶｓは電圧不感帯Ｖ、Ｑｓは基準無効電力
ｋＶａｒ、±ΔＱｓは無効電力不感帯ｋＶａｒである。FIG. 3 is a diagram showing the dead zone of constant voltage control and reactive power sharing control of the present invention. In FIG. 3, Vs is the reference voltage V, ±ΔVs is the voltage dead zone V, Qs is the reference reactive power kVar, and ±ΔQs is the reactive power dead zone kVar.
次にこの発明の制御動作を第４図に示すフローチャート
について説明する。Next, the control operation of the present invention will be explained with reference to the flowchart shown in FIG.
並行運転制御装置１７ａ、１７ｂは発電機１ａ。The parallel operation control devices 17a and 17b are the generator 1a.
１ｂ毎に装備されているため、並行運転制御はＤ／工回
路８ａ、８ｂを通して入力された補助接点３−１ａ、４
−１ａ、３−１ｂ、４−１ｂの入・切信号から被制御発
電機（以下、当該発電機と称す）が並行運転中かどうか
を演算回路１２ａ、１２ｂで判断しくステップ５Ｔ４−
１．４−２）。1b, so parallel operation control is performed using auxiliary contacts 3-1a and 4 that are input through D/work circuits 8a and 8b.
Step 5T4- The arithmetic circuits 12a and 12b determine whether the controlled generator (hereinafter referred to as the generator) is in parallel operation based on the on/off signals of -1a, 3-1b, and 4-1b.
1.4-2).
当該発電機以外の並行運転中の発電機を判別しくステッ
プ５Ｔ４−３）、制御対象と判別されれば制御が開始さ
れる。In step 5T4-3), a generator other than the generator in parallel operation is determined, and if it is determined to be a control target, control is started.
以下の説明においては、第１図の発電機１ａと発電機１
ｂとの並行運転を考える。まず、基準電圧ｖｓ、基準周
波数Ｆ、、電圧制御不感帯ΔＶ、周波数制御不感帯ΔＦ
、有効電力制御不感帯ΔＰ、無効電力制御不感帯ΔＱ、
当該発電機１ａの定格有効電力ＰＡｒ、同じく定格無効
電力Ｑ、＋、ｒ、並行運転中の他発電機１ｂの定格有効
電力ＰＢｒ、同じく定格無効電力Ｑａｒを入力しくステ
ップ５Ｔ４−４）、当該発電機１ａ側においてはＡ／Ｉ
回路１０ａを通して検出された当該発電機の電圧Ｖ＾、
電流工＾、周波数Ｆ＾を入力する（ステップ５Ｔ４−５
）。In the following explanation, the generator 1a and the generator 1 in FIG.
Consider parallel operation with b. First, reference voltage vs, reference frequency F, voltage control dead zone ΔV, frequency control dead zone ΔF
, active power control dead zone ΔP, reactive power control dead zone ΔQ,
Step 5T4-4) Enter the rated active power PAr of the generator 1a, the rated reactive power Q, +, r, the rated active power PBr of the other generator 1b in parallel operation, and the rated reactive power Qar. On the machine 1a side, A/I
The voltage V^ of the generator detected through the circuit 10a,
Input the electric current ^ and frequency F^ (step 5T4-5
).
次いで、発電機１ａの有効電力Ｐ＾、無効電力Ｑ＾を下
式により演算する（ステップ５Ｔ４−６）。Next, the active power P^ and reactive power Q^ of the generator 1a are calculated using the following formulas (step 5T4-6).
ＰＡ＝ Ｊ３Ｖ＾−ＩＡＣＯ８θ＾
ここで、θ＾は電圧Ｖ＾と電流工＾の位相差ＰＢ＝Ｊ３
ｖＡ−ＩＡｓｉｎθ＾
また、上記発電機１ａの有効電力設定値、無効電力設定
値の演算のため、発電機１ｂのアナログ信号変換器７ｂ
および断線短絡検出回路１１ａを通して入力されたＡ／
Ｉ回路１０ａから発電機１ｂの有効電力Ｐ８．無効電力
Ｑｅを検出しくステップ５Ｔ４−７）、系統の総合負荷
即ち総合有効電力ＰＬ、総合無効電力ＱＬを下式により
求める（ステップ５Ｔ４−８）。PA= J3V^-IACO8θ^ Here, θ^ is the phase difference between voltage V^ and current line PB=J3
vA-IAsinθ^ Also, in order to calculate the active power set value and reactive power set value of the generator 1a, the analog signal converter 7b of the generator 1b is used.
and the A/
Active power P8 of generator 1b from I circuit 10a. To detect the reactive power Qe (step 5T4-7), the total load of the system, that is, the total active power PL and the total reactive power QL, are determined by the following formulas (step 5T4-8).
ＰＬ＝Ｐ＾＋ＰＢ
Ｑ Ｌ ＝ Ｑ＾＋Ｑａ
これにより、発電機１ａの分担すべき有効電力つまり設
定有効電力ＰＡＳおよび設定無効電力ＱＡＳを下式によ
り求める（ステップ５Ｔ４−９）。PL=P^+PB QL=Q^+Qa As a result, the active power to be shared by the generator 1a, that is, the set active power PAS and the set reactive power QAS are determined by the following formula (step 5T4-9).
ＰＡｒ＋ＰＢｒ Ｑ Ａｒ ＋ Ｑ Ｂ ｒ ここで、ＰＡｒは発電機１ａの定格有効電力。PAr+PBr Q Ar ＋ Q B r Here, PAr is the rated active power of the generator 1a.
ＰＢｒは発電機１ｂの定格有効電力、ＱＡｒは発電機１
ａの定格無効電力、ＱＢｒは発電機１ｂの定格無効電力
である。PBr is the rated active power of generator 1b, QAr is generator 1
The rated reactive power of a is the rated reactive power of the generator 1b, and QBr is the rated reactive power of the generator 1b.
定周波数制御および有効電力の分担制御においては、第
２図に示す不感帯を有しており、周波数および有効電力
は設定値（ＦｓまたはＰ Ａｓ）からの偏差（ＦＡＤ＝
ＦＡ−ＦＳまたはＰＡＤ＝ＰＡ−ＰＡＤ）が不感帯（±
ΔＦ、±ΔＰ）以上かどうかチエツクされる（ステップ
５Ｔ４−１０およびステップ５Ｔ４−１２〜４−１７）
。In constant frequency control and active power sharing control, there is a dead zone shown in Figure 2, and the frequency and active power are determined by the deviation from the set value (Fs or P As) (FAD =
FA-FS or PAD=PA-PAD) is the dead zone (±
ΔF, ±ΔP) or more is checked (Step 5T4-10 and Steps 5T4-12 to 4-17)
.
ａ）系統周波数不感帯±ΔＦΔＦ以下きは、発電機１ａ
、ｌｂともに周波数偏差ＦＡＤを減少させる方向にＤ１
０回路１３ａ、１３ｂを経由してガバナ２−１ａ、２−
１ｂへ出力する。即ち、系統周波数のみが＋ΔＦΔＦ以
下きは周波数下げを（Ｓｒ１−１３．４−１８）、−Δ
Ｆ以下のときは上げを（Ｓｒ１−１６．４−１９）出力
する。a) When the grid frequency dead zone is below ±ΔFΔF, generator 1a
, lb both D1 in the direction of decreasing the frequency deviation FAD.
Governors 2-1a, 2- via 0 circuits 13a, 13b
Output to 1b. In other words, if only the system frequency is below +ΔFΔF, lower the frequency (Sr1-13.4-18), -Δ
When it is F or less, a raise (Sr1-16.4-19) is output.
ｂ）発電機有効電力のみが不感帯±ΔＰ以上のときは、
発電機１ａ、ｌｂともに有効電力偏差ＰＡＤを同じく減
少させる方向にガバナ信号を出力する。b) When only the generator active power is above the dead zone ±ΔP,
Both generators 1a and lb output governor signals in a direction that similarly reduces the active power deviation PAD.
即ち、発電機、有効電力のみが＋６２以上のときは有効
電力減方向すなわち周波数下げを（Ｓｒ１−１４．４−
１８） 、−ΔＰ以下のときは有効電力増加方向すなわ
ち周波数上げを（Ｓｒ１−１５゜４−１９）出力する。That is, when only the active power of the generator is +62 or more, the direction of decreasing the active power, that is, lowering the frequency (Sr1-14.4-
18) When it is less than -ΔP, outputs (Sr1-15°4-19) in the direction of increasing the active power, that is, increasing the frequency.
Ｃ）系統周波数および発電機電力がともに不感帯±ΔＦ
および＋６２以上のときは、その方向の組合せにより発
電機１ａ、ｌｂのどちらかが制御を行う０例えば第２図
の第１象限、第４象限では当該発電機ｌａ側に原因があ
るため１発電機１ａを第１象限では下げ（Ｓｒ１−１２
．４−１８）、第４象限では上げ（Ｓｒ１−１７．４−
１９）を出力する。第２象限および第３象限では発電機
１ｂ側に原因があるため１発電機ｌａ側は上げ下げとも
出力しない。C) Grid frequency and generator power are both dead zone ±ΔF
and +62 or more, depending on the combination of directions, either generator 1a or lb is controlled. Lower machine 1a in the first quadrant (Sr1-12
．． 4-18), and raised in the fourth quadrant (Sr1-17.4-
19) is output. In the second and third quadrants, the cause is on the generator 1b side, so the generator 1a side does not output whether it is up or down.
同様に定電圧制御および無効電力の分担制御においては
、第３図に示す不感帯を有しており、電圧および無効電
力は設定値（ＶｓまたはＱＡｓ）からの偏差（ＶＡＩ）
＝ＶＡ−ＶｓまたはＱＡＤ＝ＱＡ ＱＳ）が不感帯（
±ΔＶ、±ΔＱ）以上かどうかチエツクされる（ステッ
プ５Ｔ４−１１およびステップ５Ｔ４−２０〜４−２５
）。Similarly, in constant voltage control and reactive power sharing control, there is a dead zone shown in Figure 3, and the voltage and reactive power are determined by the deviation (VAI) from the set value (Vs or QAs).
=VA-Vs or QAD=QA QS) is the dead zone (
±ΔV, ±ΔQ) or more (step 5T4-11 and steps 5T4-20 to 4-25)
).
ａ）電圧のみが＋６７以上のときは、発電機１ａ。a) When only the voltage is +67 or higher, generator 1a.
１ｂともに電圧偏差ＶＡＤを減少させる方向にＤ１０回
路１３ａ、１３ｂを経由してＡＶＲＩ−１ａ。AVRI-1a via D10 circuits 13a and 13b in the direction of decreasing the voltage deviation VAD for both 1b.
１−１ｂに出力する。即ち、＋６７以上のときは電圧下
げを（Ｓｒ１−２１．４−２６） 、−ΔＶ以下のとき
は電圧上げを（Ｓｒ１−２４．４−２７）出力する。Output to 1-1b. That is, when it is +67 or more, a voltage reduction is output (Sr1-21.4-26), and when it is -ΔV or less, a voltage increase is output (Sr1-24.4-27).
ｂ）発電機無効電力のみが不感帯＋６０以上のときは、
発電機１ａ、ｌｂはともに無効電力偏差Ｑ＾Ｄを減少さ
せる方向にＡＶＲ信号を出力する。即ち、＋６９以上の
ときは電圧下げを（Ｓｒ１−２２．４−２６）、−ΔＱ
以下のときは電圧上げを（Ｓｒ１−２３．４−２７）出
力する。b) When only the generator reactive power is in the dead zone +60 or more,
Both generators 1a and lb output AVR signals in the direction of decreasing the reactive power deviation Q^D. In other words, when it is +69 or more, lower the voltage (Sr1-22.4-26), -ΔQ
In the following cases, a voltage increase (Sr1-23.4-27) is output.
Ｃ）電圧、発電機無効電力がともに不感帯＋ΔＶおよび
＋６９以上または一ΔＶおよび−ΔＱ以下のときは、周
波数および有効電力のときと同じく。C) When voltage and generator reactive power are both above dead zone +ΔV and +69 or below -ΔV and -ΔQ, same as frequency and active power.
当該発電機１ａは第３図の第１象限で上げ（Ｓｒ１−２
０．４−２６）、第４象限で上げ（ステップ５Ｔ４−２
５．２７） 、第２象限と第３象限では発電機１ａは制
御しない。The generator 1a is raised in the first quadrant of Fig. 3 (Sr1-2
0.4-26), raised in the fourth quadrant (step 5T4-2
5.27) The generator 1a is not controlled in the second and third quadrants.
次に断線短絡検出回路９ａまたは断線短絡検出回路１１
ａで並行運転制御装置１７ａ側の断線短絡を検出した場
合は、故障機１ａ側制御停止し。Next, disconnection/short circuit detection circuit 9a or disconnection/short circuit detection circuit 11
If a disconnection or short circuit on the side of the parallel operation control device 17a is detected at step a, control on the side of the faulty machine 1a is stopped.
並行運転制御装置１７ａの基準電圧設定回路１４ａ、基
準周波数設定回路１５ａより１発電機１ａのＡＶＲＩ−
１ａおよびガバナ２−１ａに瞬時に基準電圧および基準
周波数となる信号が出力される。The AVRI- of one generator 1a is determined from the reference voltage setting circuit 14a and the reference frequency setting circuit 15a of the parallel operation control device 17a.
1a and the governor 2-1a are instantaneously outputted a signal that becomes a reference voltage and a reference frequency.
その後、正常機１ｂ側は定電圧、定周波数、無効電力お
よび有効電力の制御を維持する。これにより、故障機ｌ
ａ側は基準値を保ったまま、正常機ｌｂ側のみで負荷が
分担制御され、安定に並行運転が維持される。Thereafter, the normal machine 1b side maintains control of constant voltage, constant frequency, reactive power, and active power. As a result, the faulty machine l
While the standard value is maintained on the a side, the load is shared and controlled only on the normal machine lb side, and stable parallel operation is maintained.
また、演算回路１２ａ、１２ｂでは、自己診断機能によ
りＤ／Ｉ回路８ａ、８ｂ、Ａ／１７１回路１０ａ０ｂ、
Ｄ１０回路１３ａ、１３ｂなどの並行運転制御装置１７
ａ、１７ｂの故障も常に監視しており、故障を検知する
と、前記断線短絡時と同様に故障機側を停止させ、正常
機側で定電圧。Furthermore, in the arithmetic circuits 12a and 12b, the D/I circuits 8a and 8b, the A/171 circuit 10a0b, and
Parallel operation control device 17 such as D10 circuits 13a and 13b
A and 17b are constantly monitored for failures, and when a failure is detected, the failed machine is stopped in the same way as in the case of disconnection and short circuit, and the normal voltage is maintained at a constant voltage.
定周波数、有効電力および無効電力制御を行い。Performs constant frequency, active power and reactive power control.
並行運転を支障なく継続させる。Continuing parallel operation without any hindrance.
なお、上記実施例ではＤ／Ｉ回路８ａ、８ｂ、Ａ／Ｉ回
路１０ａ、１０ｂの断線短絡は、電流出力の正常範囲外
かどうかで判別するが、これ等は電圧出力およびディジ
タル信号出力でもよい。Incidentally, in the above embodiment, disconnections and short circuits in the D/I circuits 8a and 8b and the A/I circuits 10a and 10b are determined by whether or not the current output is outside the normal range, but these may be output by voltage output or digital signal output. .
また、当該発電機用遮断器の入切信号及び電圧。Also, the on/off signal and voltage of the generator circuit breaker.
周波数、有効電力、無効電力用変流器、変圧器と当該発
電機用並行運転制御装置との間の信号線の断線・短絡が
懸念される場合は、信号変換器を変流器、変圧器の近く
におき、他の並行運転中発電機用並行運転制御装置に設
けたものと同じ断線・短絡検出回路を当該装置用にも設
けてもよい。If there is a concern about disconnection or short-circuiting of the signal line between the frequency, active power, or reactive power current transformer or transformer and the parallel operation control device for the generator, replace the signal converter with the current transformer or transformer. The same disconnection/short circuit detection circuit as that provided in other parallel operation control devices for generators during parallel operation may also be provided for this device.
さらに、演算回路１２ａ、１２ｂはマイクロコンピュー
タでもよい、各並行運転制御装置間のＤ／Ｉ回路、Ａ／
Ｉ回路の出力信号の送受信方式は。Furthermore, the arithmetic circuits 12a and 12b may be microcomputers, and the D/I circuit between each parallel operation control device, the A/
What is the transmission and reception method of the output signal of the I circuit?
多重伝送装置で代用しても同様の効果を奏する。A similar effect can be obtained by using a multiplex transmission device instead.
以上のように、この発明によれば１発電機毎に並行運転
制御装置を設け、並行運転機の自動選定、外線の断線短
絡検出、故障機に対するバックアップ、相互信号取合い
線の短縮、故障時にＡＶＲに基準電圧を設定するととも
にガバナに基準周波数を設定するように構成したので、
操作が容易で精度および信頼性の高い並行運転装置が得
られる効果がある。As described above, according to the present invention, a parallel operation control device is provided for each generator, automatic selection of parallel operation machines, disconnection/short circuit detection of outside lines, backup for failed machines, shortening of mutual signal interconnection lines, and AVR in the event of a failure. Since the configuration was configured to set the reference voltage to the controller and set the reference frequency to the governor,
This has the effect of providing a parallel operation device that is easy to operate and has high precision and reliability.
第１図はこの発明の一実施例による並行運転装置を示す
回路図、第２図、第３図はこの発明の制御不感帯を示す
特性図、第４図はこの発明の制御動作を説明するフロー
チャート図、第５図は従来の並行運転装置の回路図であ
る。
ｌａ、ｌｂは発電機、１−１ａ、１−１ｂは自動電圧調
整器（ＡＶＲ）、２ａ、２ｂは原動機。
２−１ａ、２−１ｂはガバナ、３ａ、３ｂ、４ａ。
４ｂは遮断看、３−１ａ、３−１ｂ、４−１ａ。
４−１ｂは補・動接点、７ａ、７ｂはアナログ信号変換
器、８ａ、８ｂはディジタル入力（Ｄ／ Ｉ ）回路、
９ａ、９ｂはディジタル入力断線短絡検出回路、１０ａ
、１０ｂはアナログ入力（Ａ／Ｉ）回路、ｌｌａ、ｌｌ
ｂはアナログ入力断線短絡検出回路、１２ａ、１２ｂは
演算回路、１３ａ、１３ｂはディジタル出力（Ｄｌｏ）
回路、１４ａ。
１４ｂは基準電圧設定回路、１５ａ、１５ｂは基準周波
数設定回路、１６ａ、１６ｂは負荷、１７ａ、１７ｂは
並行運転制御装置。
なお１図中、同一符号は同一または相当部分を示す。
特許出願人 三菱電機株式会社
Ｐｓ−ΔＰ Ｐｓ”ΔＰ
第
図
第
図
ｔの４
第
図
手
続
補
正
書
（自
発）
６゜
補正の内容FIG. 1 is a circuit diagram showing a parallel operation device according to an embodiment of the present invention, FIGS. 2 and 3 are characteristic diagrams showing a control dead zone of the present invention, and FIG. 4 is a flowchart explaining the control operation of the present invention. FIG. 5 is a circuit diagram of a conventional parallel operation device. la and lb are generators, 1-1a and 1-1b are automatic voltage regulators (AVR), and 2a and 2b are prime movers. 2-1a, 2-1b are governors, 3a, 3b, 4a. 4b is a blocker, 3-1a, 3-1b, 4-1a. 4-1b is an auxiliary/movement contact, 7a and 7b are analog signal converters, 8a and 8b are digital input (D/I) circuits,
9a and 9b are digital input disconnection/short circuit detection circuits, 10a
, 10b is an analog input (A/I) circuit, lla, ll
b is an analog input disconnection/short circuit detection circuit, 12a and 12b are arithmetic circuits, and 13a and 13b are digital outputs (Dlo).
Circuit, 14a. 14b is a reference voltage setting circuit, 15a and 15b are reference frequency setting circuits, 16a and 16b are loads, and 17a and 17b are parallel operation control devices. In addition, in FIG. 1, the same reference numerals indicate the same or corresponding parts. Patent applicant Mitsubishi Electric Corporation Ps-ΔP Ps”ΔP Figure t-4 Figure procedural amendment (voluntary) 6゜Contents of amendment
Claims (1)
を分担させる発電機の並行運転装置において、当該発電
機における電力系統の遮断器の入・切信号は直接、他の
並行運転中の発電機における電力系統の遮断器の入・切
信号は断線短絡検出回路を介して入力するディジタル入
力回路と、当該発電機の電圧、周波数、有効電力、無効
電力は直接、他の並行運転中の発電機の有効電力、無効
電力は断線短絡検出回路を介して入力するアナログ入力
回路と、前記ディジタル入力回路および前記アナログ入
力回路の出力信号に基づいて当該発電機が並行運転中か
否かを判別するとともに負荷分担時の当該発電機の設定
有効電力および設定無効電力を演算する演算回路と、前
記演算回路の出力信号に基づいて当該発電機を駆動する
原動機のガバナ設定器に周波数増減信号を、また、当該
発電機の自動電圧調整器の設定器に電圧増減信号を出力
し、設定器の設定値も自動追従させるとともに前記ディ
ジタル入力回路および前記アナログ入力回路の断線短絡
時あるいは並行運転装置故障時は該ガバナおよび該自動
電圧調整器への前記増減信号出力を停止し、該ガバナお
よび該自動電圧調整器を基準周波数および基準電圧に設
定する基準周波数設定回路および基準電圧設定回路へ信
号を出力するディジタル出力回路を有し、正常発電機側
で定周波数、定電圧、有効電力分担および無効電力分担
の制御を続行する並行運転装置を、前記各発電機の夫々
に対応して設けたことを特徴とする発電機の並行運転装
置。In a parallel operation system for generators in which the load is shared between at least two or more generators driven by a prime mover, the on/off signal of the circuit breaker in the power system of the generator is directly transmitted to the other generators operating in parallel. The circuit breaker on/off signal of the power system is input through a digital input circuit via a disconnection/short circuit detection circuit, and the voltage, frequency, active power, and reactive power of the generator are directly input to other generators operating in parallel. The active power and reactive power are inputted through an analog input circuit through a disconnection/short circuit detection circuit, and it is determined whether or not the generator is in parallel operation based on the output signals of the digital input circuit and the analog input circuit. A calculation circuit that calculates a set active power and a set reactive power of the generator during load sharing, and a frequency increase/decrease signal to a governor setting device of a prime mover that drives the generator based on the output signal of the calculation circuit; A voltage increase/decrease signal is output to the setting device of the automatic voltage regulator of the generator, and the setting value of the setting device is automatically followed, and when the digital input circuit and the analog input circuit are disconnected or short-circuited, or when the parallel operation device fails, A digital output that stops outputting the increase/decrease signal to the governor and the automatic voltage regulator and outputs a signal to a reference frequency setting circuit and a reference voltage setting circuit that sets the governor and the automatic voltage regulator to the reference frequency and reference voltage. A parallel operation device having a circuit and continuing control of constant frequency, constant voltage, active power sharing and reactive power sharing on the normal generator side is provided corresponding to each of the generators. Parallel operation device for generators.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63168982A JPH0799906B2 (en) | 1988-07-08 | 1988-07-08 | Generator parallel operation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63168982A JPH0799906B2 (en) | 1988-07-08 | 1988-07-08 | Generator parallel operation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0223038A true JPH0223038A (en) | 1990-01-25 |
| JPH0799906B2 JPH0799906B2 (en) | 1995-10-25 |
Family
ID=15878160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63168982A Expired - Fee Related JPH0799906B2 (en) | 1988-07-08 | 1988-07-08 | Generator parallel operation device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0799906B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04359632A (en) * | 1991-03-15 | 1992-12-11 | Mitsubishi Electric Corp | Synchronous closing device |
| JP2011193586A (en) * | 2010-03-12 | 2011-09-29 | Mitsubishi Electric Corp | Private power generation system |
| CN103872647A (en) * | 2014-02-25 | 2014-06-18 | 苏州美高立电气有限公司 | Multiloop intelligent motor protector |
-
1988
- 1988-07-08 JP JP63168982A patent/JPH0799906B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04359632A (en) * | 1991-03-15 | 1992-12-11 | Mitsubishi Electric Corp | Synchronous closing device |
| JP2011193586A (en) * | 2010-03-12 | 2011-09-29 | Mitsubishi Electric Corp | Private power generation system |
| CN103872647A (en) * | 2014-02-25 | 2014-06-18 | 苏州美高立电气有限公司 | Multiloop intelligent motor protector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0799906B2 (en) | 1995-10-25 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |