JPH0799906B2 - Generator parallel operation device - Google Patents
Generator parallel operation deviceInfo
- Publication number
- JPH0799906B2 JPH0799906B2 JP63168982A JP16898288A JPH0799906B2 JP H0799906 B2 JPH0799906 B2 JP H0799906B2 JP 63168982 A JP63168982 A JP 63168982A JP 16898288 A JP16898288 A JP 16898288A JP H0799906 B2 JPH0799906 B2 JP H0799906B2
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- Japan
- Prior art keywords
- circuit
- generator
- parallel operation
- disconnection
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Supply And Distribution Of Alternating Current (AREA)
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。TECHNICAL FIELD The present invention relates to a generator parallel operation apparatus for operating a plurality of generators in parallel.
第５図は例えば特公昭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り、図において、1a,1
bは発電機、2a,2bは発電機1a,1bを駆動する原動機、3a,
3bは発電機1a,1b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、1
7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,1bの有効電力
検出器18a,18b、各発電機1a,1b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,1b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20a,20bとで構成されている。FIG. 5 is a circuit diagram showing a conventional parallel operation apparatus disclosed in, for example, Japanese Examined Patent Publication No. 36493/1984.
b is a generator, 2a, 2b are prime movers driving the generators 1a, 1b, 3a,
3b is a circuit breaker provided on the busbars of the generators 1a and 1b, 4 is a circuit breaker provided on the busbar communication line, 16a and 16b are loads connected to the busbars, 1
Reference numeral 7 denotes a parallel operation control device that operates the generators 1a and 1b in parallel. The parallel operation control device 17 is 1 from the active power detectors 18a and 18b of the generators 1a and 1b and the active power of each of the generators 1a and 1b. It is composed of an averaging circuit 19 for obtaining the average active power per unit, and operational amplifier circuits 20a, 20b for comparing the active power of each generator 1a, 1b with the average value of the averaging circuit 19.
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,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,Vrbは次式
で示されるようにセットされている。Next, the operation will be described. Now, the generator 1a and 1b are any power factor of the load 16a, take 16b, and are parallel operation, active power detector 18a, Va output of 18b, Vb, the output of the averaging circuit 19 when the V M The inputs Vra and Vrb of the operational amplifiers 20a and 20b are set as shown by the following equation.
Vra＝Va−VM ……（１） Vrb＝Vb−VM ……（２） 従って、（３）式を（１），（２）に代入すると となる。 Vra = Va-V M ...... ( 1) Vrb = Vb-V M ...... (2) Therefore, substituting equation (3) into equations (1) and (2), Becomes
一方、演算増幅器20a,20bは入力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、発
電機1aの有効電力Vaが発電機1bの有効電力Vbより大の
時、即ち、Va＞Vbのときは、演算増幅器20aの出力信号
は、プラスのため、原動機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,1b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。On the other hand, the operational amplifiers 20a and 20b are configured so that the output becomes zero only when the inputs Vra and Vrb are zero. Therefore, when the active power Va of the generator 1a is larger than the active power Vb of the generator 1b, that is, when Va> Vb, the output signal of the operational amplifier 20a is positive, so the prime mover 2a of the generator 1a 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 to reduce the effective power of each generator 1a, 1b. Averaging, that is, sharing of active power.
従来の並行運転装置は以上のように異状の検出機能もな
く、又１台の装置で集中して制御するように構成されて
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、誤動作した場合は並行運転時の負担分担が異
常となり、過負荷等で発電機停止し、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、１台の並行運転装置の入出力信号線を
切替え使用することになるが、この時、並列運転中の発
電機を検出し、信号線を切替えるのが困難で別途、並行
運転機検出及び入出力信号切替装置が必要であり、並行
運転される発電機が離れて別の区画に設置される場合
は、区画間のアナログ入力回路、ディジタル出力回路な
どとのとり合い信号線が長く多くなり、これら信号線の
断線、短絡などの事故の確率が高くなる。よって、断線
又は短絡等が発生すると、並行運転装置は誤った入力を
もとに制御するため、負荷不平衡を拡大させ、並行運転
の失敗及び過負荷トリップ等による電源の停止が懸念さ
れる。更に並行運転中の発電機の出力電圧値が異なる場
合は、これを補正する機能がないため、無効電力の不平
衡が発生するなどの問題点があった。As described above, the conventional parallel operation device does not have the abnormal detection function and is configured so that it can be centrally controlled by one device. Therefore, not only the parallel operation control device malfunctions but also malfunctions occur. In such a case, the burden sharing during parallel operation becomes abnormal, and the generator may stop due to overload, which may lead to a serious accident such as loss of power. Also, when there are multiple generators operating in parallel, the input / output signal lines of one parallel operating device are switched and used. At this time, the generators in parallel operation are detected and the signal lines are If it is difficult to switch and a parallel operation machine detection and input / output signal switching device is required separately, and the generators that operate in parallel are installed separately in different sections, the analog input circuit between the sections and the digital output The number of signal lines that interact with circuits increases and the number of accidents such as disconnection or short circuit of these signal lines increases. Therefore, when a disconnection or a short circuit occurs, the parallel operation device controls based on an erroneous input, so that the load imbalance is expanded, and there is a concern that the parallel operation may fail or the power supply may be stopped due to an overload trip. Furthermore, when the output voltage values of the generators in parallel operation are different, there is a problem that reactive power unbalance occurs because there is no function to correct this.
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
および並行運転中の発電機の出力電圧値が異なる場合に
おける無効電力の不平衡を解決する発電機の並行運転装
置を得ることを目的とする。The present invention has been made to solve the above problems, and automates the detection of a generator during parallel operation, and continues parallel operation even if the parallel operation control device fails or the signal line is broken or short-circuited. An object of the present invention is to obtain a parallel generator for a generator that can be used and that can reduce the number of signal lines, shorten the signal line, and solve the imbalance of reactive power when the output voltage values of the generator are different during parallel operation.
［課題を解決するための手段］ この発明に係る発電機の並行運転装置は、並行運転され
ている少なくとも２台以上の原動機駆動発電機に負担を
分担させるよう制御する発電機の並行運転制御装置にお
いて、特定発電機と電力系統との連結用遮断器の入・切
信号を直接入力するとともに、他の並行運転中の発電機
における電力系統の遮断機の入・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、特定発電
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
タル入力回路からの信号に基づいて前記特定発電機と並
行運転中の他の発電機を判別すると共にアナログ入力回
路からの信号に基づいて負荷分担時の特定発電機の設定
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特定発電機を駆動する
原動機のガバナに周波数増減信号を、また、特定発電機
の自動電圧調整器に電圧増減信号を出力するディジタル
出力回路と、前記ディジタル入力回路および前記アナロ
グ入力回路で断線か短絡検出時あるいは並行運転装置故
障時における前記ディジタル出力回路からの信号に基づ
いて前記ガバナおよび前記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基準
電圧設定回路とを備え、断線か短絡又は装置故障を検出
した発電機側では定周波数、定電圧制御を、正常発電機
側では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
たものである。[Means for Solving the Problem] A parallel operation device for a generator according to the present invention controls a parallel operation control device of a generator that controls at least two or more prime mover-driven generators that are in parallel operation to share the load. In this case, the on / off signal of the circuit breaker for connection between the specified generator and the power system is directly input, and the on / off signal of the power system circuit breaker for other parallel generators is connected to the disconnection short-circuit detection circuit. Analog input from the digital input circuit that is input via the direct input of the voltage, frequency, active power, and reactive power of the specified generator, and active and reactive power of the generator that is running in parallel through the open circuit detection circuit. An input circuit and a signal from the digital input circuit are used to discriminate between the specific generator and another generator that is operating in parallel, and based on a signal from the analog input circuit, identification during load sharing 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 of the prime mover that drives the specific generator based on the output signal of the arithmetic circuit, and automatic voltage adjustment of the specific generator. A digital output circuit for outputting a voltage increase / decrease signal to the controller, and the governor and the automatic controller based on the signal from the digital output circuit when a disconnection or a short circuit is detected by the digital input circuit and the analog input circuit or when a parallel operation device fails. Equipped with a reference frequency setting circuit and a reference voltage setting circuit that set the voltage regulator to the reference frequency and reference voltage, the generator side that detected a disconnection or short circuit or device failure can perform constant frequency, constant voltage control, normal generator On the side, a parallel operation device for continuing control of active power sharing and reactive power sharing is provided corresponding to each of the generators. It is.
この発明における並行運転装置は、当該発電機の電圧、
周波数、有効電力、無効電力を検出し、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、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、信号線の少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。The parallel operation device in this invention is the voltage of the generator,
Frequency, active power, reactive power is detected, and a reference voltage preset in the arithmetic circuit, frequency, and set active power and set reactive power calculated by the arithmetic circuit are compared,
Outputs to the governor and automatic voltage regulator of the generator shall be output only when the deviation between the frequency and active power and the voltage and reactive power decrease, respectively, and not when the deviation increases. By doing so, it is possible to continue parallel operation even if the parallel operation control device fails and the signal line is disconnected and short-circuited, and it is possible to solve the problem of the reduction and shortening of the signal line and the imbalance of the reactive power.
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,1bの自動電圧調
整器（以下、AVRと略称する）、２−1a,2−1bは原動機2
a,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、４−1a,4−1bは母線連結用遮断器4
a,4bの補助接点、5a,5bは変流器、6a,6bは変圧器、7a,7
b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。8a,8
bはデイジタル入力回路（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,10bはアナログ入力回路（以下、A/I回路と略
称する）、11a,11b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の出力の正常範囲
（４〜20mA）外で断線・短絡を検出する。12a,12bは制
御動作のほかに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はデイジタル
出力回路（以下、D/O回路と略称する）、14a,14b又は15
a,15bはD/O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、AVR1−1a,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。17a又は17bは上記部材7a〜15aま
たは7b〜15b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。An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, 1-1a and 1-1b are automatic voltage regulators (hereinafter abbreviated as AVR) of generators 1a and 1b, and 2-1a and 2-1b are prime mover 2
Governors provided on a and 2b, 3-1a and 3-1b are auxiliary contacts of generator breakers 3a and 3b, and 4-1a and 4-1b are busbar connecting breakers 4
a, 4b auxiliary contacts, 5a, 5b current transformers, 6a, 6b transformers, 7a, 7
Reference numeral b is an analog signal converter for extending the signal line, and the normal range of the output current is usually 4 to 20 mA. 8a, 8
b is a digital input circuit (hereinafter abbreviated as D / I circuit),
9a and 9b are disconnection / short-circuit detection circuits for D / I circuit input, and a resistor (not shown) is connected to the contact in series and in parallel near the contact, and normally it is identified as closed even if the D / I contact is open. A circuit that applies a current limited by the series resistance even if it is closed, and detects disconnection / short circuit due to loss or increase of this current, 10a, 10b are analog input circuits (hereinafter referred to as A / I circuit), 11a and 11b are disconnection short circuit detection circuits for A / I circuit input, and detect disconnection / short circuit outside the normal range (4 to 20mA) of the output of the analog signal converters 7a and 7b. To do. 12a and 12b are arithmetic circuits that perform self-diagnosis function fault detection and abnormality processing in addition to control operations, 13a and 13b are digital output circuits (hereinafter abbreviated as D / O circuits), 14a, 14b or 15
a, 15b is a reference voltage setting circuit acting on the AVR 1-1a, 1-1b or the governor 2-1a, 2-1b so that the reference voltage or the reference frequency is instantly obtained by one pulse of the D / O circuits 13a, 13b. It is a reference frequency setting circuit. Reference numeral 17a or 17b is a parallel operation control device for the generator 1a or 1b constituted by the members 7a to 15a or 7b to 15b.
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,11b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,11b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、出力が零となり区別
がつかず検出が出来ない。In order to detect the disconnection short circuit of the signal line between the current transformers 5a, 5b and the transformers 6a, 6b and the disconnection short circuit detection circuits 11a, 11b, the current transformer 5a, in the disconnection short circuit detection circuit 11a, 11b. Even if only the secondary side data of 5b and transformers 6a and 6b are constantly monitored, the disconnection short-circuit cannot be detected because the output is zero and indistinguishable as in the case where the generator is normally stopped.
そこで、変流器5a,5bおよび変圧器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,7bと断
線短絡検出回路11a,11b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,11bの入力は零となるた
め断線短絡の検出が可能となる。Therefore, the analog signal converter 7a, 7b is placed near the current transformers 5a, 5b and the transformers 6a, 6b, and the analog signal converter 7a,
The output signal of 7b is configured to output several mA or several V even when the generator is stopped. When a disconnection / short circuit occurs in the signal line between the analog signal converters 7a, 7b and the disconnection short circuit detection circuits 11a, 11b, the input of the disconnection short circuit detection circuits 11a, 11b becomes zero, so that the disconnection short circuit can be detected.
上記の断線短絡検出回路11a,11bとアナログ入力回路10
a,10bの違いは前者の回路11a,11b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 disconnection short circuit detection circuits 11a and 11b and the analog input circuit 10 described above.
The difference between a and 10b is that the former circuits 11a and 11b identify and detect only disconnection and short circuit, and the latter circuits 10a and 10b detect 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 and the transformers 6a, 6b and the analog signal converters 7a, 7b are installed close to each other, disconnection / short circuit between them is 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Hz、±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 a dead band of the constant frequency control and active power sharing control of the present invention. In FIG. 2, Fs is a reference frequency Hz, ± ΔF is a frequency dead band Hz, and Ps is a reference active power.
kW and ± ΔP are active power dead zones 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 dead zones of the constant voltage control and reactive power sharing control of the present invention. In FIG. 3, Vs is a reference voltage V, ± ΔVs is a voltage dead zone V, Qs is a reference reactive power kVar,
± 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 described with reference to the flowchart shown in FIG.
並行運転制御装置17a,17bは発電機1a,1b毎に装備されて
いるため、並行運転制御はD/I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（ステップST4−
1,4−２）、当該発電機以外の並行運転中の発電機を判
別し（ステップST4−３）、制御対象と判別されれば制
御が開始される。Since the parallel operation control devices 17a, 17b are provided for each of the generators 1a, 1b, the parallel operation control is performed by the auxiliary contacts 3-1a, 4-1a, 3-1b, input through the D / I circuits 8a, 8b. Based on the ON / OFF signal of 4-1b, the arithmetic circuits 12a and 12b determine whether the controlled generator (hereinafter referred to as the generator) is in parallel operation (step ST4-
1, 4-2), the generators other than the generator in parallel operation are discriminated (step ST4-3), and if discriminated as 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1bと
が並行運転中であり、かつ、連係されて同期運転中であ
る場合を考える。まず、基準電圧Vs、基準周波数Fs、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QAr、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QBrを入力し（ステップST4−４）、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VA、電流IA、周波数FAを入力する（ステップST4−
５）。In the following description, it is assumed that the generator 1a and the generator 1b shown in FIG. 1 are in parallel operation, and they are linked and are in synchronous operation. First, the reference voltage Vs, the reference frequency Fs, the voltage control dead zone ΔV, the frequency control dead zone ΔF, the active power control dead zone ΔP, the reactive power control dead zone ΔQ, the generator 1a.
Rated active power P A r, type similarly rated reactive power Q A r, the rated active power P B r of other generators 1b in parallel operation, also the rated reactive power Q B r (step ST4-4), the On the side of the generator 1a, the voltage V A , current I A , and frequency F A of the generator detected through the A / I circuit 10a are input (step ST4−
5).
次いで、発電機1aの有効電力PA、無効電力QAを下式によ
り演算する（ステップST4−６）。Next, the active power P A and the reactive power Q A of the generator 1a are calculated by the following formulas (step ST4-6).
ここで、θＡは電圧VAと電流IAの位相差 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PB、無効電力QBを検出し（ステッ
プST4−７）、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ST4−
８）。 Where θ A is the phase difference between voltage V A and current I A Further, for the calculation of the active power set value of the generator 1a, the reactive power set value, the analog signal converter 7b of the generator 1b and the A / I circuit 10a input through the disconnection short circuit detection circuit 11a from the generator 1b. The active power P B and the reactive power Q B are detected (step ST4-7), and the total load of the system, that is, the total active power P L and the total reactive power Q L are obtained by the following formulas (step ST4−
8).
PL＝PA＋PB QL＝QA＋QB 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ST4−９）。P L = P A + P B Q L = Q A + Q B Thus, the active power to be shared by the generator 1a, that is, the set active power P AS and the set reactive power Q AS are obtained by the following formula (step ST4-9).
ここで、PArは発電機1aの定格有効電力、PBrは発電機1b
の定格有効電力、QArは発電機1aの定格無効電力、QBrは
発電機1bの定格無効電力である。 Here, P A r is the rated active power of the generator 1a, P B r a generator 1b
The rated active power of Q A r is the rated reactive power of the generator 1a, and Q B r 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、発電機1aの周波数FAお
よび有効電力PAは基準周波数FSまたは設定有効電力PAS
からの偏差（FAD＝FA−FSまたはPAD＝PA−PAS）が不感
帯（±ΔF,±ΔＰ）以上かどうかチェックされる（ステ
ップST4−10およびステップST4−12〜４−17）。In the constant frequency control and the active power sharing control, the dead zone shown in FIG. 2 is provided, and the frequency F A and active power P A of the generator 1a are the reference frequency F S or the set active power P AS.
From the deviation (F AD = F A −F S or P AD = P A −P AS ) is above the dead zone (± ΔF, ± ΔP) (step ST4-10 and steps ST4-12 to ST4-12 to 4-) 17).
ａ） 発電機有効電力の分担は正常で系統周波数のみが
不感帯±ΔＦ以上のときは、発電機1a,1bともに周波数
偏差FADを減少さる方向にD/0回路13a,13bを経由してガ
バナ２−1a,2−1bへ出力する。即ち両機共ガバナ同一方
向に制御するため、両機の負荷分担量は変らず系統周波
数のみが変ることになる。例えば、系統周波数のみが＋
ΔＦ以上のときは両機共周波数下げを（ST4−13,4−1
8）、−ΔＦ以下のときは両機共上げを（ST4−16,4−1
9）出力する。a) When the generator active power is normally shared and only the system frequency is in the dead zone ± ΔF or more, both the generators 1a and 1b go through the D / 0 circuits 13a and 13b in the direction of decreasing the frequency deviation F AD. Output to 2-1a and 2-1b. That is, since both governors control in the same direction, the load sharing amount of both units does not change, but only the system frequency changes. For example, only the system frequency is +
When ΔF or more, reduce the frequency of both units (ST4-13-1).
8), when -ΔF or less, raise both units (ST4-16,4-1
9) Output.
ｂ） 発電機有効電力のみが不感帯±ΔＰ以上のとき
は、総合負荷をＰとすると、発電機1bでＰ＋ΔＰであれ
ば発電機1bではＰ−ΔＰとなっている。故に、発電機1
a,1b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。即ち、発電機、有効電力のみが
＋ΔＰ以上の発電機側は有効電力減方向すなわち周波数
下げを（ST4−14,4−18）、−ΔＰ以下の発電機側は有
効電力増方向すなわち周波数上げを（ST4−15,4−19）
出力する。このように、１台が上げのときは、残１台は
下げ信号出力となるため系統周波数の変化は少ない。b) When only the generator active power is in the dead zone ± ΔP or more, assuming that the total load is P, if the generator 1b is P + ΔP, the generator 1b is P−ΔP. Hence the generator 1
Both a and 1b output the governor signal in the same direction to reduce the active power deviation P AD . That is, the generator, the generator side where the active power only is + ΔP or more, decreases the active power, that is, the frequency is lowered (ST4-14, 4-18), and the generator side below -ΔP is the active power increase, that is, the frequency is increased. (ST4-15, 4-19)
Output. In this way, when one unit is raised, the remaining one unit is the lowered signal output, and therefore the change in the system frequency is small.
ｃ） 系統周波数および発電機電力がともに不感帯±Δ
Ｆおよび±ΔＰ以上のときは、その方向の組合せにより
発電機1a,1bのどちらかが制御を行う。例えば第２図の
第１象限、第４象限では当該発電機1a側に原因があるた
め、発電機1aを第１象限では下げ（ST4−12,4−18）、
第４象限では上げ（ST4−17,4−19）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、
発電機1a側では上げ下げとも出力しない。c) Dead band ± Δ for both system frequency and generator power
When F or ± ΔP or more, either of the generators 1a and 1b controls depending on the combination of the directions. For example, in the first quadrant and the fourth quadrant of FIG. 2, there is a cause on the side of the generator 1a, so the generator 1a is lowered in the first quadrant (ST4-12, 4-18),
Raise (ST4-17, 4-19) is output in the fourth quadrant. Second
In the quadrant and the third quadrant, there is a cause on the generator 1b side,
On the generator 1a side, neither output nor output is output.
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（VAD＝VA−VS
またはQAD＝QA−QS）が不感帯（±ΔV,±ΔＱ）以上か
どうかチェックされる（ステップST4−11およびステッ
プST4−20〜４−25）。Similarly, in the constant voltage control and reactive power sharing control, there is a dead zone shown in Fig. 3, and the voltage and reactive power deviate from the set value (Vs or Q AS ) (V AD = V A −V S
Alternatively, it is checked whether or not Q AD = Q A -Q S ) is above the dead zone (± ΔV, ± ΔQ) (steps ST4-11 and ST4-20 to 4-25).
ａ） 電圧のみが±ΔＶ以上のときは、発電機1a,1bと
もに電圧偏差VADを減少させる方向にD/O回路13a,13bを
経由してAVR1−1a,1−1bに出力する。即ち、＋ΔＶ以上
のときは電圧下げを（ST4−21,4−26）、−ΔＶ以下の
ときは電圧上げを（ST4−24,4−27）出力する。a) When only the voltage is ± ΔV or more, both the generators 1a and 1b output to the AVRs 1-1a and 1-1b via the D / O circuits 13a and 13b in the direction of decreasing the voltage deviation V AD . That is, when the voltage is + ΔV or more, the voltage decrease is output (ST4-21, 4-26), and when the voltage is −ΔV or less, the voltage increase is output (ST4-24, 4-27).
ｂ） 発電機無効電力のみが不感帯±ΔＱ以上のとき
は、発電機1a,1bはともに無効電力偏差QADを減少させる
方向にAVR信号を出力する。即ち、＋ΔＱ以上のときは
電圧下げを（ST4−22,4−26）、−ΔＱ以下のときは電
圧下げを（ST4−23,4−27）出力する。b) When only the reactive power of the generator is above the dead zone ± ΔQ, both the generators 1a and 1b output the AVR signal in the direction of decreasing the reactive power deviation Q AD . That is, when + ΔQ or more, the voltage reduction (ST4-22, 4-26) is output, and when -ΔQ or less, the voltage reduction (ST4-23, 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＋ΔＱ以上または−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、当該発電機1aは
第３図の第１象限で上げ（ST4−20,4−26）、第４象限
で上げ（ステップST4−25,27）、第２象限と第３象限で
は発電機１は制御しない。c) When the voltage and the reactive power of the generator are both above the dead zone + ΔV and + ΔQ or below -ΔV and -ΔQ,
As in the case of frequency and active power, the generator 1a is raised in the first quadrant (ST4-20, 4-26) of Fig. 3 (ST4-20, 4-26), raised in the fourth quadrant (steps ST4-25, 27), second quadrant. And the generator 1 is not controlled in the third quadrant.
次に断線短絡検出回路9aまたは断線短絡検出回路11aで
並行運転制御装置17a側の断線短絡を検出した場合は、
故障した発電機1a側の制御を停止し、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、発電機1aのAVR1−1a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。Next, if the disconnection short circuit detection circuit 9a or the disconnection short circuit detection circuit 11a detects a disconnection short circuit on the side of the parallel operation control device 17a,
Stop the control of the failed generator 1a side
The reference voltage setting circuit 14a and the reference frequency setting circuit 15a of 17a instantaneously output a signal that becomes the reference voltage and the reference frequency to the AVR 1-1a and the governor 2-1a of the generator 1a.
その後、正常機1a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1a側
は基準値を保ったまま、正常機1b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。After that, the normal machine 1a side maintains control of constant voltage, constant frequency, reactive power, and active power. As a result, the load on the faulty machine 1a side is controlled only on the normal machine 1b side while maintaining the reference value, 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/I回路10a,10b、D/O回路13a,13bなどの並行
運転制御装置17a,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、定周波数、有効電力および無
効電力制御を行い、並行運転を支障なく継続させる。Further, in the arithmetic circuits 12a, 12b, the self-diagnosis function constantly monitors the failure of the parallel operation control devices 17a, 17b such as the D / I circuits 8a, 8b, the A / I circuits 10a, 10b, the D / O circuits 13a, 13b. When a failure is detected, the failed machine side is stopped in the same manner as when the disconnection short circuit occurs, and the normal machine side performs constant voltage, constant frequency, active power and reactive power control to continue parallel operation without any trouble.
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断する
が、これ等は電圧出力およびデイジタル信号出力でもよ
い。In the above embodiment, the disconnection short circuit of the D / I circuits 8a, 8b and the A / I circuits 10a, 10b is judged by whether it is out of the normal range of the current output, but these may be the voltage output and the digital signal output. .
また、当該発電機用遮断器の入切信号及び電圧、周波
数、有効電力、無効電力変流器、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、信号変換器を信号変換器（D/I信号につい
ては不要）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。In addition, there are concerns about disconnection / short circuit of signal line between the ON / OFF signal and voltage, frequency, active power, reactive power current transformer, transformer of the generator circuit breaker and the generator parallel operation control device. If the signal converter is used, the signal converter (not necessary for D / I signals) is placed near the current transformer and transformer, and it is the same as the one installed in the parallel operation controller for other parallel generators. A disconnection / short circuit detection circuit may be provided for the 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、多重伝送装置で代用しても同様の
効果を奏する。Further, the arithmetic circuits 12a and 12b may be microcomputers. Even if the multiplex transmission device is substituted for the transmission / reception system of the output signals of the D / I circuit and the A / I circuit between the parallel operation control devices, the same effect is obtained.
以上のように、この発明によれば、発電機が並行運転中
か否かを判別し、断線か短絡時あるいは並行運転装置故
障時は、発電機を駆動す原動機のガバナおよび該発電機
の自動電圧調整器に基準周波数および基準電圧を設定し
又並行運転中の他の発電機の前記断線か短絡あるいは故
障となったことを検知すると有効電力及び無効電力分担
を行う並行運転制御装置を発電機毎に設けたので、並行
運転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、区画間の信号線の少数化と短縮化およ
び並行運転中の発電機の出力電圧値が異なる場合におけ
る無効電力の不平衡を解決することができるという効果
がある。As described above, according to the present invention, it is determined whether or not the generator is in parallel operation, and when a disconnection or a short circuit occurs or when the parallel operation device fails, the governor of the prime mover that drives the generator and the automatic generator A parallel operation control device that sets a reference frequency and a reference voltage in a voltage regulator and shares active power and reactive power when it detects the disconnection, short circuit, or failure of another generator in parallel operation Since it is provided for each, parallel operation can be continued even if the parallel operation device fails or the signal line is disconnected and short-circuited, and the number of signal lines between sections is reduced and shortened and the output voltage value of the generator during parallel operation is different. In this case, it is possible to solve the imbalance of the reactive power.
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
チヤート図、第５図は従来の並行運転装置の回路図であ
る。 1a,1bは発電機、１−1a,1−1bは自動電圧調整器（AV
R）、2a,2bは原動機、２−1a,2−1bはガバナ、3a,3b,4
a,4bは遮断器、３−1a,3−1b,4−1a,4−1bは補助接点、
7a,7bはアナログ信号変換器、8a,8bはデイジタル入力
（D/I）回路、9a,9bはデイ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、11a,11bはア
ナログ入力断線短絡検出回路、12a,12bは演算回路、13
a,13bはデイジタル出力（D/O）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、図中、同一符号は同一または相当部分を示す。FIG. 1 is a circuit diagram showing a parallel operation apparatus 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 flow chart for explaining control operation of the present invention. FIG. 5 is a circuit diagram of a conventional parallel operation device. 1a and 1b are generators, 1-1a and 1-1b are automatic voltage regulators (AV
R), 2a, 2b are prime movers, 2-1a, 2-1b are governors, 3a, 3b, 4
a, 4b are circuit breakers, 3-1a, 3-1b, 4-1a, 4-1b are auxiliary contacts,
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 and 10b are analog input (A / I) circuits, 11a and 11b are Analog input disconnection short circuit detection circuit, 12a and 12b are arithmetic circuits, 13
a and 13b are digital output (D / O) circuits, 14a and 14b are reference voltage setting circuits, 15a and 15b are reference frequency setting circuits, 16a and 16b are loads, and 17a and 17b are parallel operation control devices. In the drawings, the same reference numerals indicate the same or corresponding parts.
Claims (1)
原動機駆動発電機に負荷を分担させるよう制御する発電
機の並行運転装置において、特定発電機と電力系統との
連結用遮断器の入・切信号を直接入力するとともに、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、特定発電機の電圧、周波数、有効電力、無
効電力は直接、他の並行運転中に発電機の有効電力、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からの信号に基づい
て前記特定発電機と並行運転中の他の発電機を判別する
と共にアナログ入力回路からの信号に基づいて負荷分担
時の特定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
特定発電機を駆動する原動機のガバナに周波数増減信号
を、また、特定発電機の自動電圧調整器に電圧増減信号
を出力するディジタル出力回路と、前記ディジタル入力
回路および前記アナログ入力回路で断線か短絡検出時あ
るいは並行運転装置故障時における前記ディジタル出力
回路からの信号に基づいて前記ガバナおよび前記自動電
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とを備え、断線、
短絡又は装置故障を検知した場合は定周波数、定電圧制
御を実行し、又並行運転中の他の発電機の前記断線、短
絡、装置故障での負荷分担制御不可を検知すると、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。Claim: What is claimed is: 1. A parallel operation device for a generator, which controls at least two or more prime mover-driven generators operating in parallel so as to share a load, and a circuit breaker for connecting a specific generator and a power system. Directly input the cut-off signal and turn on / off the breaker of the power system of another generator in parallel operation.
The disconnection signal is input via the disconnection short-circuit detection circuit, and the voltage, frequency, active power and reactive power of the specified generator are directly connected, and the active power and reactive power of the generator during other parallel operation are disconnected. An analog input circuit that is input via a detection circuit, and other generators that are in parallel operation with the specific generator based on signals from the digital input circuit, and load sharing based on signals from the analog input circuit. A calculation circuit for calculating the set active power and the set reactive power of the specific generator at the time, a frequency increase / decrease signal to the governor of the prime mover that drives the specific generator based on the output signal of the calculation circuit, and the specific generator A digital output circuit for outputting a voltage increase / decrease signal to an automatic voltage regulator and a device for parallel operation when a disconnection or short circuit is detected by the digital input circuit and the analog input circuit. And a reference frequency setting circuit and the reference voltage setting circuit for setting the reference frequency and a reference voltage signal the governor and the automatic voltage regulator on the basis of from the digital output circuit in the event of failure, disconnection,
When a short circuit or device failure is detected, constant frequency and constant voltage control is executed, and when it is detected that the load sharing cannot be controlled due to the disconnection, short circuit, or device failure of another generator in parallel operation, active power sharing and A parallel operation device for a generator, wherein a parallel operation device for continuing control of sharing of reactive power is provided for each of the 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 JPH0223038A (en) | 1990-01-25 |
| JPH0799906B2 true 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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2714496B2 (en) * | 1991-03-15 | 1998-02-16 | 三菱電機株式会社 | Synchronous injection device |
| JP5550389B2 (en) * | 2010-03-12 | 2014-07-16 | 三菱電機株式会社 | 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
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0223038A (en) | 1990-01-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |