JPS62247776A - Method and apparatus for starting synchronous motor - Google Patents
Method and apparatus for starting synchronous motorInfo
- Publication number
- JPS62247776A JPS62247776A JP9171186A JP9171186A JPS62247776A JP S62247776 A JPS62247776 A JP S62247776A JP 9171186 A JP9171186 A JP 9171186A JP 9171186 A JP9171186 A JP 9171186A JP S62247776 A JPS62247776 A JP S62247776A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- synchronous motor
- voltage
- motor
- difference
- 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.)
- Pending
Links
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims description 7
- 230000003068 static effect Effects 0.000 claims abstract description 67
- 239000007858 starting material Substances 0.000 claims abstract description 59
- 238000001514 detection method Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 abstract description 5
- 230000003028 elevating effect Effects 0.000 abstract 1
- 230000005284 excitation Effects 0.000 description 12
- 230000001133 acceleration Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Landscapes
- Motor And Converter Starters (AREA)
Abstract
Description
【発明の詳細な説明】
[発明の技術分野]
本発明は同期電動機の起動に係り、特に静止形起動装置
を使用した揚水発電所の同期発電電動機を電動機として
起動する場合にn適な起1)I 15法および装置に関
するものである。Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to the starting of a synchronous motor, and particularly to a suitable starting method when starting a synchronous generator motor of a pumped storage power plant using a static starting device as an electric motor. ) I 15 Method and Apparatus.
[発明の技術的背景とその問題点1
一般に静止形起動装置とは、商用周波数電源を整流して
、これをインバータにより別の周波数に変換しこの出力
周波数r電動機を駆動するものである。そして、それ自
体が起動および加速時にのみ使用されることから、静止
形起動装置あるいは静止形始動装置と呼ばれている。[Technical background of the invention and its problems 1 Generally, a static starter device rectifies a commercial frequency power source, converts it to another frequency using an inverter, and drives a motor with an output frequency r. Since the starter itself is used only during startup and acceleration, it is called a static starter or static starter.
以下、この種の静止形起動装置を使用した従来の同期発
電電動機の起動装置の一例について第3図を用いて説明
する。An example of a conventional starting device for a synchronous generator-motor using this type of static starting device will be described below with reference to FIG.
第3図において、1は同期発電電動(幾(以下、電動機
と称する)、1Aはその界磁巻線である。In FIG. 3, 1 is a synchronous generator motor (hereinafter referred to as a motor), and 1A is its field winding.
また、2は静止形起動装置であり、2Aはその出力しゃ
断器、2Bはその順逆変換器および制御部、2Cはその
入力変圧器、2Dはその人力L/ p断器である。さら
に、3は界磁巻線1△に界1n電流を供給するための励
磁装置であり、3Aはイの変換器および制御部、3Bは
その電源変圧器である。Further, 2 is a static starter, 2A is its output breaker, 2B is its forward/reverse converter and control section, 2C is its input transformer, and 2D is its manual L/p breaker. Furthermore, 3 is an excitation device for supplying a field 1n current to the field winding 1Δ, 3A is the converter and control unit of A, and 3B is its power transformer.
一方、4は主要変圧器、5は電力系統、6は所内高圧電
源、7は並列用しゃ断器、8.9.10は計器用電圧変
成器である。また、11は周波数差制御装置、12は自
動同期装置、13は総合制御インターロック回路を示す
ものである。On the other hand, 4 is the main transformer, 5 is the electric power system, 6 is the high-voltage power supply in the station, 7 is the parallel circuit breaker, and 8.9.10 is the instrument voltage transformer. Further, 11 is a frequency difference control device, 12 is an automatic synchronization device, and 13 is a general control interlock circuit.
かかる構成において、電動機1を起動するにあたっては
、並列用しゃ断器7を開放した状態で励磁装置3を動作
させて電動機1に励磁を与えると共に、静止形起動装置
2の人、出力しゃ断器2D。In this configuration, to start the electric motor 1, the excitation device 3 is operated with the parallel breaker 7 open to apply excitation to the electric motor 1, and the static starter 2 and the output breaker 2D are activated.
2Aを投入して静止形起動装置2を作動させる。2A to activate the static starter device 2.
そして、この静止形起動装置2は、電力系統5より受電
した商用周波電力を最初は非常に低周波の出力として電
動機1に与え、電動機1の回転上昇に伴って静止形起動
装置2の出力周波数も上昇させて電動機1を加速してい
く。なおこの場合、脱調を起させずに起動、加速を行な
うには、起動するまでは電動機1の回転子位置に関連し
た制御が、またある程度速度が上昇してくれば電動機端
子電圧位相に関連した変換器の制御が必要であるが、本
発明はこれらの点に関するものではないのでその説明は
省略する。The static starter 2 initially supplies the commercial frequency power received from the power system 5 to the motor 1 as a very low frequency output, and as the rotation of the motor 1 increases, the output frequency of the static starter 2 increases. is also raised to accelerate the electric motor 1. In this case, in order to start and accelerate without causing step-out, control related to the rotor position of motor 1 is necessary until starting, and once the speed has increased to a certain extent, control related to the motor terminal voltage phase is required. However, since the present invention does not relate to these points, a description thereof will be omitted.
一方、電動機1の端子電圧はでの回転数と与えている界
磁電流に略比例することから、励1i装置3から電動1
11のwIt1巻I!111Aに流す電流は、定格回転
数で電動機端子電圧が定格電圧となるように設定してい
る。また、加速トルクは略界磁電流と静止形起動装M2
の出力電流との積に比例することから、静1F形起動装
置2の出力周波数と位相はそのインバータ側の制皿で行
ない、出力電流はその整流器側の制御で行なうことがで
きる。そして、電動機1が略定格速度に)!するまでは
静止形起動装置2の出力は定格電流に制御し、定格速度
に近づいた時点で周波数差制罪装@11が動作し、静止
形起動装置2の出力電流を制御して電動機端子電圧の周
波数と系統側周波数どの差が目標値となるように制御す
る。またこれと同時に、励ta装置3の制御モードも電
動機端子電圧一定制御(以下、AVRモードと称する)
に切換え、電動機端子電圧を励磁装置3に内蔵した電圧
設定器の設定値に制御する。On the other hand, since the terminal voltage of the electric motor 1 is approximately proportional to the rotational speed and the applied field current, the excitation device 3
11 wIt Volume 1 I! The current flowing through 111A is set so that the motor terminal voltage becomes the rated voltage at the rated rotation speed. In addition, the acceleration torque is approximately equal to the field current and static type starting device M2.
Since it is proportional to the product of the output current and the output current, the output frequency and phase of the static 1F starter 2 can be controlled by the control plate on the inverter side, and the output current can be controlled by the rectifier side. Then, motor 1 reaches approximately the rated speed)! The output of the static starter 2 is controlled to the rated current until the speed reaches the rated speed, and the frequency difference suppression device @11 operates to control the output current of the static starter 2 to reduce the motor terminal voltage. control so that the difference between the frequency and the grid frequency becomes the target value. At the same time, the control mode of the exciter device 3 is also constant motor terminal voltage control (hereinafter referred to as AVR mode).
and controls the motor terminal voltage to the set value of the voltage setting device built into the excitation device 3.
さらにここで、自動同期装置12を動作させて並列用し
ゃ断器7両側の電圧が等しくなるよう励磁装@3に信号
Cを与え、これを一致するように励磁@置3を制御する
。また、自動同期装置12はこれと同時に、電圧差が許
容値内にあること、および周波数差が目標値以内にある
ことを点検し、これらの条件が満足されていると各種連
動回路の時間遅れを見込んで設定した角度(これを一般
に前進角と称する)だけ位相差のある状態となった時に
、同期投入信号すを発信する。そして、この信号すを総
合制御インターロック回路13を介して静止形起動装置
2へその停止信号として与えると共に、静止形起動装置
2の出力しゃ断器2Aを開放し、並列用しゃ断器7を投
入する。これにより、電動機1は電圧差も位相差も許容
値内の状態で、主要変圧器4を介して電力系統5に並入
されることになる。すなわち従来の起動装置では、略理
想的な電動機の系統並入が行なわれている。Furthermore, here, the automatic synchronizer 12 is operated to apply a signal C to the excitation device @3 so that the voltages on both sides of the parallel breaker 7 are equal, and the excitation device @3 is controlled so that the voltages on both sides of the parallel circuit breaker 7 become equal. At the same time, the automatic synchronizer 12 checks that the voltage difference is within the allowable value and that the frequency difference is within the target value, and if these conditions are satisfied, the time delay of various interlocking circuits is set. When there is a phase difference by an angle set in anticipation of the forward angle (this is generally called the advance angle), a synchronization start signal is transmitted. Then, this signal is given as a stop signal to the static starter 2 via the general control interlock circuit 13, the output breaker 2A of the static starter 2 is opened, and the parallel circuit breaker 7 is turned on. . As a result, the electric motor 1 is connected to the electric power system 5 via the main transformer 4 with both the voltage difference and the phase difference within tolerance values. That is, in the conventional starting device, a substantially ideal system parallelization of electric motors is performed.
さて、上述したように従来の起動装置は、電動機の系統
並入という点では全く問題のないものと言えるが、次に
述べるような軒演的な問題点がある。すなわち、電動機
端子電圧と静止形起動装置2が接続された状態で、?[
f ll]tN端了電圧端型電圧統5との間の位相合せ
、電圧台ゼが行なわれるため、静止形起動装冒2の出力
電圧は電動機定格電圧(含む系統電圧変動に合せるだめ
の調整余裕)まで許容されるものでなければならない。Now, as mentioned above, although it can be said that the conventional starting device has no problem at all in terms of the parallel use of the electric motor in the system, there are obvious problems as described below. That is, with the motor terminal voltage and static starter device 2 connected, ? [
f ll] tN terminal voltage terminal type voltage control unit 5 and voltage control unit 5 are performed, the output voltage of the static type starting equipment 2 is adjusted to match the motor rated voltage (including system voltage fluctuations). It must be permissible up to (a margin).
しかるに、かかる起動装置を例えば揚水発電所に適用し
たような場合には、静止形起動装置2に使用されるサイ
リスタ素子の個数は、その出力電流よりもその出力電圧
で決ってしまう場合がほとんどである。すなわち、電流
容量的には数倍(α倍とする)の余裕があるサイリスタ
素子を、多数個直列接続して必要な電圧耐量を得ている
のが通例である。However, when such a starting device is applied to a pumped storage power plant, for example, the number of thyristor elements used in the static starting device 2 is almost always determined by its output voltage rather than its output current. be. That is, it is customary to obtain the necessary voltage withstand capacity by connecting a large number of thyristor elements in series, which have several times (α times) a margin in terms of current capacity.
従って、静止形起動装置2の出力型1”Eを従来の1/
αまで許容できるものとし、電流は従来のα倍まで許容
できるように設計でるど、静止形起動装置2による加速
能力等を変えないで、静止形15動装置2に使用するサ
イリスタ素子数を、並ダケ′zが同じで直列数が1/α
になるため略1/αに減少することができ、静止形起動
装置2の順逆変換器部分の大幅なコスト低減が可能とな
る。しかし、単に静止形起動装置2の主回路をこのよう
に設計しただけでは、静止形起動装@2の運転中に電動
機電圧を系統電圧に合せることができず、前述したよう
な理想的な電動機1の電力系統5への並入を行なうこと
はできない。Therefore, the output type 1”E of the static starter device 2 is
The design is designed so that the current can be tolerated up to α, and the current can be tolerated up to α times that of the conventional one.However, without changing the acceleration ability etc. of the static starter device 2, the number of thyristor elements used in the static starter device 2 is as follows: The number of series is 1/α with the same average thickness ′z
Therefore, it can be reduced to approximately 1/α, and the cost of the forward/reverse converter portion of the static starter device 2 can be significantly reduced. However, simply designing the main circuit of the static starter device 2 in this way does not allow the motor voltage to match the grid voltage while the static starter device 2 is in operation. 1 cannot be connected to the power system 5 in parallel.
[発明の目的]
本発明は上述したような問題点を解決するために成され
たもので、その目的は静止形起動装置の許容出力電圧を
電動機定格電圧より低下して静止形起動装置の大幅なコ
スト低減を図ると共に、理想的な電動機の電力系統への
同期並入を確実に行なうことが可能な同期電動機の起動
方法および装置を提供することにある。[Object of the Invention] The present invention has been made to solve the above-mentioned problems, and its purpose is to reduce the allowable output voltage of the static starter device from the motor rated voltage, thereby significantly increasing the static starter device's allowable output voltage. It is an object of the present invention to provide a method and apparatus for starting a synchronous motor, which can reduce costs and ensure ideal synchronous connection of the motor to a power system.
[発明の概要]
上記の目的を達成するために本発明では、電力系統へ並
入可能に設けられた同期電動機を起動するための起動装
置を、上記電力系統より受電した商用周波電力を所定の
周波数に変換し、当該周波電力にて上記同期電動機を起
動する静止形起動装置と、上記同期電動機の端子電圧の
周波数と当該同期電動機が定常運転時に接続される上記
電力系統の周波数との差を目標周波数差となるように制
御し、かつ当該状態となったことを検出する周波数差制
御装置と、上記同期電動機の端子電圧と上記電力系統の
電圧との位相差が目標位相差になると上記静止形起動装
置の運転を停止する目標位相差設定器、および当該佼相
差が目標位相差になると動作する位相差8Q定器を備え
てなる停止位相差設定検出装置と、上記同期電動数の端
子電圧と上記電力系統の電圧との電圧差1周波数差が夫
々許容値以内にあることを条件に、上記同期電動機を電
力系統へ並入する自動同期装置とを備えて構成し、同期
電動機を起動するに際して、まず静止形起動装置により
同期電動機をその周波数が電力系統の周波数よりも高く
なるまで加速し、次に上記同期電動機と電力系統の周波
数差が目標周波数差になり、かつ位相差が目標位相差に
なった時点で、静止形起動装置を停止して同期電動機か
ら切随し、しかる後に同期電動機が減速してくる途中で
電動機電圧を上昇させ、電力系統との電圧差。[Summary of the Invention] In order to achieve the above object, the present invention provides a starting device for starting a synchronous motor that can be connected to the power system in parallel with the commercial frequency power received from the power system. a static starting device that converts the frequency into a frequency power and starts the synchronous motor with the frequency power; a frequency difference control device that controls the frequency to reach a target frequency difference and detects that the state has been reached; A stop phase difference setting detection device comprising a target phase difference setting device that stops the operation of the type starter, and a phase difference 8Q constant device that operates when the phase difference becomes the target phase difference, and a terminal voltage of the synchronous motor number. The synchronous motor is configured to include an automatic synchronizer that connects the synchronous motor to the power grid, and the synchronous motor is started, on the condition that a voltage difference of one frequency difference between the voltage and the voltage of the power grid is within the respective allowable values. At this time, the synchronous motor is first accelerated by a static starter until its frequency becomes higher than the frequency of the power grid, and then the frequency difference between the synchronous motor and the power grid becomes the target frequency difference, and the phase difference reaches the target position. When the phase difference is reached, the static starter is stopped and the synchronous motor is disconnected, and then, as the synchronous motor decelerates, the motor voltage is increased to reduce the voltage difference with the power grid.
位相差2周波数差が夫々許容値以内となったことを条件
に同期電動機を電力系統へ並入するようにしたことを特
徴とする。The present invention is characterized in that the synchronous motor is connected to the power system on the condition that the phase difference and the two frequency differences are within tolerance values.
まず本発明は、静止形起動装置で電動機周波数を系統周
波数より高くなるまで加速し、静止形起動装置を停止し
て電動機より切離した後、電動機が減速してくる途中で
電動機電圧を上昇させ、かつ電力系統との電圧差2位相
差1周波数差が許容値に入った状態で自動同期装置によ
り電動機を電力系統に並入するものである。ここで重要
なことは、どのような状態で静止形起動装置を停止すれ
ばよいかの条件であり、単に電動機周波数が電力系統周
波数より高いだけでは、電圧差9位相差。First, the present invention accelerates the motor frequency with a static starter until it becomes higher than the grid frequency, stops the static starter and disconnects it from the motor, and then increases the motor voltage while the motor is decelerating. The automatic synchronizer connects the motor to the power grid in a state where two voltage differences, two phase differences, and one frequency difference with the power grid are within permissible values. What is important here is the condition under which the static starter should be stopped.If the motor frequency is simply higher than the power grid frequency, there will be a voltage difference of 9 phase difference.
周波数差の並入3条件を満足することはできない。It is not possible to satisfy the three conditions for frequency differences.
従って本発明では、静止形起動装置の運転中に電動機と
電力系統の周波数差(電動機測高)が目標値になったこ
と、および位相差が目標値となったことで静止形起動装
置を停止することにより、電動機減速途中で並入3条件
が成立するようにしたものである。。Therefore, in the present invention, the static starter is stopped when the frequency difference between the motor and the power system (motor height measurement) reaches the target value while the static starter is in operation, and when the phase difference reaches the target value. By doing so, the three parallel entry conditions are satisfied during the deceleration of the motor. .
[発明の実施例]
以下、上述のような考え方に基づいた本発明の一実施例
について図面を参照して説明する。[Embodiment of the Invention] Hereinafter, an embodiment of the present invention based on the above-mentioned idea will be described with reference to the drawings.
第1図は、本発明による電動機の起動装置の構成例を示
すもので、第3図と同一部分には同一符号を付してその
説明を省略し、ここでは異なる部分についてのみ述べる
。つまり第1図は、第3図における静止形起動装置2の
許容出力電圧を低減し、許容出力電流を増加すると其に
、前記各々の計器用変圧器8,9からの電圧を入力どし
、かつ信号eを前記総合制御インターロック回路13へ
出力する停止位相設定検出装置14を備えて構成するよ
うにしたものである。FIG. 1 shows an example of the configuration of a starting device for an electric motor according to the present invention. The same parts as in FIG. 3 are given the same reference numerals, and the explanation thereof will be omitted, and only the different parts will be described here. In other words, FIG. 1 shows that when the allowable output voltage of the static starter 2 in FIG. 3 is reduced and the allowable output current is increased, the voltages from the respective potential transformers 8 and 9 are inputted. In addition, the stop phase setting detection device 14 outputs the signal e to the general control interlock circuit 13.
次に、上述の停止位相設定検出装置14について説明す
る。Next, the above-mentioned stop phase setting detection device 14 will be explained.
本装置の目的とする機能は、前述したシステム全体の説
明からも推定できるように、電動機端子電圧と電力系統
電圧の並入点における位相差が目標値となった時に信@
eを発生するもので、その目標値が調整設定可能なもの
であればよい。かかる装置の一例を第2図を用いて述べ
る。As can be deduced from the above description of the entire system, the intended function of this device is to generate a signal when the phase difference at the point where the motor terminal voltage and the power grid voltage are parallel reaches the target value.
Any device that generates e and whose target value can be adjusted and set is sufficient. An example of such a device will be described with reference to FIG.
第2図において、14−Aは位相角トランスジューサで
、2つの交流人力14−σ1,14−σ2の位相差を直
流信号g1に変換して出力するものである。また、14
−POTはポテンショメータ、14−Pl、14−N1
は定電圧化された補助直流電源の正負母線である。さら
に、l4−CCはコンパレータで、2つの入力信号つま
り位相角トランスジューサ14−Aからの位相差角信号
g1.ポテンショメータ14−POTからの目標位相差
信号g2が一致した時のみ、出力信号eを発生するもの
である。In FIG. 2, 14-A is a phase angle transducer which converts the phase difference between two AC human inputs 14-σ1 and 14-σ2 into a DC signal g1 and outputs the same. Also, 14
-POT is a potentiometer, 14-Pl, 14-N1
are the positive and negative busbars of the auxiliary DC power supply with constant voltage. Furthermore, l4-CC is a comparator which receives two input signals, namely the phase difference angle signal g1. from the phase angle transducer 14-A. The output signal e is generated only when the target phase difference signal g2 from the potentiometer 14-POT matches.
従って、かかる装置14の入力14−σ1として計器用
電圧変成器8の2次電圧を、入力14−σ2として計器
用電圧変成器9の2次電圧を入力することにより、本装
置の機能が実現できる。すなわち、並列用しゃ断器7の
前後電圧の位相差が位相角トランスジューサ14−Aで
直流信号g1に変換され、これがポテンショメータ14
−POTで3没定した目標位相差信号g2と一致した時
に、コンパレータl4−CCが信号eを発生することに
なる。Therefore, by inputting the secondary voltage of the instrument voltage transformer 8 as the input 14-σ1 of the device 14 and the secondary voltage of the instrument voltage transformer 9 as the input 14-σ2, the functions of this device are realized. can. That is, the phase difference between the voltages before and after the parallel circuit breaker 7 is converted into a DC signal g1 by the phase angle transducer 14-A, and this is converted into a DC signal g1 by the potentiometer 14.
When the target phase difference signal g2 coincides with the target phase difference signal g2 determined by -POT, the comparator l4-CC generates the signal e.
なおこの場合、位相角トランスジューサとして一般に市
販されているものは、360@の範囲にわたって正確に
位相差を検出できるものは少なく、±160″′ぐらい
の範囲であるため、計器用電圧変成器8および9ど本装
置への入力14−σ1および14−σ2への入力相を変
えることにより適切な検出範囲を実現できる。また、市
販品では入力電圧の許容変動範囲があまり広くないので
、乙l器用電圧変成器9側に接vtする入力については
、特殊仕様として低い電圧から動作可能とするか、この
1lflfが動作する状態の電圧に台上て補助変成器を
設け、−担この装置が動作して電動機端子電圧を−F昇
させる前に@置を切離してしまう等の配慮をすればよい
。In this case, there are few commercially available phase angle transducers that can accurately detect a phase difference over a range of 360@, and the range is about ±160'', so the instrument voltage transformer 8 and An appropriate detection range can be achieved by changing the input phase to the inputs 14-σ1 and 14-σ2 to this device.Also, commercially available products do not have a very wide allowable variation range of input voltage, so it may be difficult to For the input connected to the voltage transformer 9 side, either make it a special specification that allows it to operate from a low voltage, or install an auxiliary transformer on a stand at the voltage at which this 1lflf operates, so that this device does not operate. Therefore, consideration may be taken such as disconnecting the @ position before raising the motor terminal voltage to -F.
次にかかる如く構成した起動装置による電動機の起動方
法について説明する。Next, a method for starting the electric motor using the starting device configured as described above will be explained.
まず、起動初期の動作および加速については従来例で説
明した通りであるが、静止形起動装置2の許容出力電圧
に合せて励磁装置3の出力電流、つまり電動機1の界磁
巻線1Aに流す電流は低く設定しておく。また、周波数
制御装置11の設定は並入時の許容周波数差に設定する
のではなく、電動機周波数の方が高くかつ以下に述べる
条件を満足するように設定しておく。これは簡単に表現
すれば、静止形起動装置2を停止し、電動機端子電圧を
上昇させる制御が行なわれている間に、電動機1は加速
力がなくなり各種損失で減速してゆくが、この間の減速
にて、並入する時点で並入許容周波数差となるように高
い周波数差に設定しておく必要がある。First, the operation and acceleration at the initial stage of startup are as explained in the conventional example, but the output current of the excitation device 3, that is, the output current of the excitation device 3, is applied to the field winding 1A of the motor 1 in accordance with the allowable output voltage of the static starter device 2. Set the current low. Further, the setting of the frequency control device 11 is not set to the permissible frequency difference at the time of parallel entry, but is set so that the motor frequency is higher and satisfies the conditions described below. To put it simply, while the static starter 2 is stopped and the motor terminal voltage is increased, the motor 1 loses acceleration and decelerates due to various losses. During deceleration, it is necessary to set a high frequency difference so that the parallel entry permissible frequency difference is reached at the time of parallel entry.
さて、いま電動機1が静止形起動装置2により加速され
てその周波数が電力系統周波数に近づくと、上記周波数
差制御装置11の動作により電動機周波数は電力系統5
の周波数との差が設定値となるよう制御し、その状態に
なったことを示す信号dを発生する。一方、停止位相設
定検出装画14は電動機端子電圧と電力系統電圧との位
相差が目標位相差となった時貞旬に、目標イウ相差とな
ったことを示す信号eを発生づる。イして、総合制御イ
ンターロック回路13はこれら信号dと信号eの両者を
入力した時点で、静止形起動装置2の停止および出力し
ゃ断器2A、2Dのしゃ断を行なうと共に、励11装置
3へ電圧上昇指令を与え、これにより励磁装置3の制御
モードはAVRモードとなり、急速に電動機端子電圧を
定格電圧に上昇させる。Now, when the electric motor 1 is accelerated by the static starter 2 and its frequency approaches the power grid frequency, the frequency difference control device 11 operates to change the motor frequency to the power grid 5.
control is performed so that the difference between the frequency of On the other hand, the stop phase setting detection device 14 generates a signal e indicating that the phase difference between the motor terminal voltage and the power system voltage reaches the target phase difference when the phase difference reaches the target phase difference. When both the signals d and e are input, the general control interlock circuit 13 stops the static starter 2 and shuts off the output circuit breakers 2A and 2D, and at the same time stops the static starter 2 and cuts off the output circuit breakers 2A and 2D. A voltage increase command is given, whereby the control mode of the excitation device 3 becomes the AVR mode, and the motor terminal voltage is rapidly increased to the rated voltage.
次に、このようにして電動機端子電圧が定格電圧近くに
なると、自動同期装置11は並列用しゃ断器7前後の電
圧差9周波数差が並入許容値以内にあること、および並
列用しゃ断器7の動作遅れを見込んで設定した角度だけ
位相差のある状態に達したことにより、同期投入信号す
を発生する。Next, when the motor terminal voltage becomes close to the rated voltage in this way, the automatic synchronizer 11 detects that the voltage difference 9 frequency difference before and after the parallel circuit breaker 7 is within the parallel tolerance value, and that the parallel circuit breaker 7 A synchronization input signal is generated when a phase difference is reached by an angle set in anticipation of an operation delay.
そして、この信号りが総合制御インターロック回路13
を介して並列用しゃ断器7を投入し並入が完了する。(
信号fは、総合制御インターロック回路13から各装置
や機器に与えられる信号を代表して一つの記号で示して
いる。)
一方、既に筒中に説明したがこの場合、静止形起動装置
2を停止してから電動機端子電圧の定格値までの上昇を
行なうので、この間に電動機1は減速する。従って、静
止形起動装置2を停止する時点の周波数差と位相差が非
常に重要となり、これを数式により説明する。Then, this signal is transmitted to the general control interlock circuit 13.
The parallel circuit breaker 7 is turned on through the parallel connection, and the parallel connection is completed. (
The signal f is shown by one symbol representing the signal given from the comprehensive control interlock circuit 13 to each device or device. On the other hand, as already explained in the cylinder, in this case, the motor terminal voltage is increased to the rated value after the static starter 2 is stopped, so the motor 1 is decelerated during this time. Therefore, the frequency difference and phase difference at the time of stopping the static starter 2 are very important, and these will be explained using mathematical expressions.
すなわち今、電力系統5の周波数をfs(Hz)静止形
起動装置停止時の電動機周波数をfm(Hz)、その時
の位相差をδ0 (度)、電動機定格回転数近傍での電
動機1に動く減速度をα()−1z /sec 2 )
とする。また、同期並人的の許容周波数差をΔ+(Hz
)、許容位相差をΔδ(度)とする。そして、静止形起
動装置停止から同期並入までの間fSとαは一定と仮定
する。That is, now, the frequency of the power system 5 is fs (Hz), the motor frequency when the static starter is stopped is fm (Hz), the phase difference at that time is δ0 (degrees), and the frequency of the motor 1 moving near the motor rated rotation speed is Let the speed be α()-1z/sec2)
shall be. In addition, the allowable frequency difference for synchronous ordinary people is Δ+(Hz
), and the allowable phase difference is Δδ (degrees). It is assumed that fS and α are constant from the stop of the static starter to the synchronous entry.
静止形起動装置停止時から1秒後の電動機周波数を(t
(+−12>、位相差をδt (度)(電動機側進みを
正で表現)とすると、
ft−fm−αt ・・・・・・・・・
(1)−δo +360((III −チ 5)t−
180αt 2 ・・・・・
・・・・(2)また、静止形起動装置2を停止してから
電動機端子電圧を定格電圧に1貸させるのに必要な時間
をT秒(但し余裕も含む)とすると、T秒時の周波数差
は%t −fs =fm−αt−Jsとなる。The motor frequency one second after the static starter stops is (t
(+-12>, if the phase difference is δt (degrees) (motor side advance is expressed as positive), then ft-fm-αt...
(1)-δo +360((III-chi 5)t-
180αt 2・・・・・・
(2) Also, if the time required to make the motor terminal voltage equal to the rated voltage by 1 after stopping the static starter 2 is T seconds (including a margin), then T seconds The frequency difference is %t - fs = fm - αt - Js.
よって、1つの条件としてΔf≧fm−(s−αt≧−
Δf、この限界の王を(s、(m、α。Therefore, one condition is Δf≧fm−(s−αt≧−
Δf, the king of this limit (s, (m, α.
Δfで表現すると、
および
このΔf限界時におけるδtを(Tとすると、(2)式
に
を代入すると、いずれの場合も
どなる。Expressed by Δf, and if δt at the limit of Δf is (T), substituting into equation (2) yields a roar in both cases.
この6丁が±360°の整数倍(0倍を含む)±Δδで
あれば、周波数差と位相差に関する同期並入条件が成立
するわけであり、前述した周波数差設定と静止形起動装
M停止時の目標位相差は、これらの数式より決定するよ
うにしなければならない。If these six units are an integer multiple (including 0 times) ±Δδ of ±360°, the synchronization conditions regarding the frequency difference and phase difference are satisfied, and the above-mentioned frequency difference setting and static starting device M The target phase difference at the time of stopping must be determined from these formulas.
ところで、一般に電力系統の周波数isの変動は非常に
小さく、また減速力αも電動機や起動時の電動機負荷が
決ってしまえばほとんど変動しないと言える。従って、
いま実施例としてfs=50.0Hz 、 a= 0.
03 Hz /sec 2 、電動機電圧上昇に必要な
時間T=2sec、許容Δf=0.25Hz、許容位相
差Δδ−10°とし、式(3−2)を使用してf!11
を算出すると、
fm =fs +a丁+△f
−50,0+ 0.03 x 2+ 0.25 =50
.31 Hz式(4)よりδT =O’ となる6口を
篩出覆ると、よって、δa=、= 15L4’となり、
δ、 = 1806に設定しておけばよいと言える。Incidentally, in general, fluctuations in the frequency is of the power system are very small, and it can be said that the deceleration force α hardly changes once the motor and the motor load at startup are determined. Therefore,
As an example, fs=50.0Hz, a=0.
03 Hz/sec 2 , time required for motor voltage rise T = 2 sec, allowable Δf = 0.25 Hz, allowable phase difference Δδ-10°, and using equation (3-2), f! 11
When calculating, fm = fs + a + △f -50,0+ 0.03 x 2+ 0.25 = 50
.. 31 Hz From formula (4), if we sift through the 6 holes where δT = O', then δa =, = 15L4',
It can be said that it is sufficient to set δ, = 1806.
ここで、再度式(1)および式(2)で動作を確認して
みると、静止形起動装置停止後2秒の電動機端子電圧の
周波数は、f t −50,31−0,03x 2=5
0.25 (Hz ) 、この時の位相差は、δを一
160’ + 360’ x (50,31−50)
x 2− 180xO003x 22−361.6 (
度)、すなわち1.6”差となって同期条件を満足して
いる。更に、8.85秒後にもf t =50.31−
0.03 X 8,58 =50,05(トIZ)、δ
t=720(度)となって同期並入条件を満足すること
になる。Here, if we check the operation again using equations (1) and (2), the frequency of the motor terminal voltage 2 seconds after the static starter stops is f t -50,31-0,03x 2= 5
0.25 (Hz), the phase difference at this time is δ - 160' + 360' x (50, 31-50)
x 2- 180xO003x 22-361.6 (
degree), that is, the difference is 1.6", satisfying the synchronization condition.Furthermore, even after 8.85 seconds, f t =50.31-
0.03 x 8,58 = 50,05 (to IZ), δ
t=720 (degrees), which satisfies the synchronous parallel condition.
上述したように本実施例によれば、静止形起動装置2に
使用するサイリスタ素子数を大幅に少なくしてコストを
低減することができ、その結果困難となる電動機1の電
力系統5への同期並入も従来とほとんど変わらず、略理
想的な状態で実施することができその効果は極めて大き
い。As described above, according to this embodiment, it is possible to significantly reduce the number of thyristor elements used in the static starter device 2, thereby reducing costs, and as a result, synchronization of the electric motor 1 with the power system 5, which is difficult, can be achieved. Parallel insertion is also almost the same as in the past, and can be carried out under almost ideal conditions, and the effect is extremely large.
なお、同期並入の3条件のうち電圧合せについては、定
格電圧に制御するのみで系統電圧への正確な揃圧操作は
省略しているが、一般に電力系統の電圧変動はそれ稈大
きくないので、電動機端子電圧を定格値に制御しておけ
ば、許容電圧差を超えて自動同期装置12が同期並入信
号すを発生できないチャンスはほとんど無いと言える。Of the three conditions for synchronous parallel connection, voltage adjustment is only controlled to the rated voltage, and accurate voltage adjustment to the grid voltage is omitted, but voltage fluctuations in power grids are generally not that large. If the motor terminal voltage is controlled to the rated value, it can be said that there is almost no chance that the automatic synchronizer 12 will not be able to generate a synchronous parallel input signal due to exceeding the allowable voltage difference.
しかし、電圧合せも正確に行なってより理想的な同期並
入を行なう場合には、励磁装置3に含まれるAVRの電
圧設定器の位置を起動途中で操作し、AVRモード運転
に切換えた時には既に電圧設定器の設定が系統電圧と合
致しているようにすることもできる。However, if you want to perform more ideal synchronous parallelization by accurately adjusting the voltages, operate the voltage setting device of the AVR included in the excitation device 3 during startup, and by the time you switch to AVR mode operation, the It is also possible to ensure that the settings on the voltage setter match the grid voltage.
また、上記では静止形起動′gtM停止後の減速度αは
一定として有効性を説明したが、実際には短時間の変化
はないが経年的な変化が考えられる。Moreover, although the effectiveness has been explained above on the assumption that the deceleration α after the static start-up 'gtM stop is constant, in reality there is no change over a short period of time, but it is thought that it may change over time.
そこで、各部設定をそのままにして、αが0.03H2
/5eC2から0.06 Hz /sec 2に変化し
た場合を考えてみると、式(2)よりδ、 = 16
0°としてδ1=0°、±360°、± 720°にな
る時間tを算出してみると、2.3秒、8.0秒、 1
1.6秒。Therefore, by leaving the settings as they are, α is 0.03H2
Considering the case where the frequency changes from /5eC2 to 0.06 Hz /sec2, from equation (2), δ, = 16
Assuming 0°, the time t for δ1 = 0°, ±360°, ±720° is calculated as 2.3 seconds, 8.0 seconds, 1
1.6 seconds.
16.17秒が実時間として存在する。そして式(1)
より、2.3秒ではf t =50.31−0.06
x 2.3=50.172 (HZ ) 、8秒ではf
t =50.31−0,06 x8−49.83
(H2) 、 11.61秒では(t = 50.31
−0.06 xll、61−49.61 (f−1z
)となり、周波数差は2.3秒および8秒において0
.25Hz以内を満足する。すなわち、このように減速
度αに大きな経年変化があっても、同期並入条件を2度
満足するチャンスがある。16.17 seconds exists as real time. and equation (1)
Therefore, f t =50.31-0.06 at 2.3 seconds
x 2.3=50.172 (HZ), f in 8 seconds
t = 50.31-0.06 x8-49.83
(H2), at 11.61 seconds (t = 50.31
-0.06 xll, 61-49.61 (f-1z
), and the frequency difference is 0 at 2.3 seconds and 8 seconds.
.. Satisfy within 25Hz. In other words, even if there is a large change in deceleration α over time, there is a chance that the synchronous parallel entry condition will be satisfied twice.
このような効果は、静止形起動装置停止時の周波数差と
位相差の両方を適切に管理することにより得られるもの
で、いずれかの管理をやめると同期並入条件を満足する
チャンスが失なわれて(、すう。特に、周波数差の管理
が重曹であり、これを行なわないと同期並入条件を11
るチャンスが失なわれることは、実数例で説明するまで
もなく容易に推定できる。This effect can be obtained by appropriately managing both the frequency difference and the phase difference when the static starter is stopped; if either of them is stopped, the chance to satisfy the synchronization condition will be lost. In particular, managing the frequency difference is a matter of baking soda, and if this is not done, the synchronization condition will be
It can be easily estimated that opportunities to improve are lost without needing to explain using actual numbers.
=21−
ここで、周波数差を前述のように管理し、位相差を管理
しない場合を考えてみる。すなわち、減速度a−0,0
3Hz /sec 2とし、f m −50,31Hz
で静止形起動装置2を停止するものとすると、式(1)
より同期並入条件を満足する周波数差である時間は、5
0.25−50.31 = 0.03t、49.75−
50.31−0,03tを解いて2秒から18.67秒
の間である。=21- Here, let us consider a case where the frequency difference is managed as described above, but the phase difference is not managed. That is, the deceleration a-0,0
3Hz/sec 2, f m -50,31Hz
Assuming that the static starter device 2 is stopped at , Equation (1)
The time that is the frequency difference that satisfies the synchronous parallel condition is 5
0.25-50.31 = 0.03t, 49.75-
Solving 50.31-0.03t, it is between 2 seconds and 18.67 seconds.
式(2)よりδo−0とした場合、δtは2秒において
進み201.6°、10.333秒において最大進み5
76.5°となり、これからは遅れ方向に変化して18
.67秒においては進み201.6°となる。この場合
には、最悪でも同期点を1度は通過する。また、減速度
cx= 0.(161−IZ /sec 2になった場
合は、上述と同様にして周波数差を満足する時間は1秒
から9,333秒であるが、電圧上昇に必要な時間を考
えると1秒から9.333秒の間である。さらにδn−
0とした場合は、δtは2秒において進み180’ 、
5.167秒において最大進み288.3’ となり9
.333秒において進み100.8°に戻ってくる。す
なわち、δ0が−61,7’〜81.7°で静止形起動
装置2を停止した場合は、周波数差が訂容値内にある期
間に位相差が許容範囲に入らない。よって、同期並入条
件を満足するチャンスが存在しなくなる。According to equation (2), when δo-0 is set, δt advances by 201.6 degrees in 2 seconds, and reaches a maximum advance of 5 degrees in 10.333 seconds.
It becomes 76.5°, and from now on it changes to the delay direction and becomes 18
.. At 67 seconds, it advances to 201.6°. In this case, at worst the synchronization point will be passed once. Moreover, deceleration cx=0. (If it becomes 161-IZ/sec 2, the time to satisfy the frequency difference in the same manner as above is 1 second to 9,333 seconds, but considering the time required for voltage rise, it is 1 second to 9. 333 seconds.Furthermore, δn−
When set to 0, δt advances in 2 seconds and becomes 180',
At 5.167 seconds, the maximum advance was 288.3', which was 9
.. It advances and returns to 100.8° in 333 seconds. That is, when the static starter 2 is stopped when δ0 is between -61.7' and 81.7°, the phase difference does not fall within the allowable range during the period when the frequency difference is within the corrected value. Therefore, there is no chance of satisfying the synchronous parallel entry condition.
しかるに本実施例によれば、2度の同期並入のチャンス
ができるため同期並入を確実に行なうことができると共
に、静止形起動装置2の順逆変換器部分の大幅なコスト
低減を図ることが可能となり、その効果は極めて大きい
ものである。However, according to this embodiment, since there are two chances for synchronous parallel entry, synchronous parallel entry can be performed reliably, and the cost of the forward/reverse converter portion of the static starter device 2 can be significantly reduced. This has become possible, and the effects are extremely large.
尚、上述の実施例では並列用しゃ断器7を主要変圧器4
の低圧側に設けた場合で説明したが、並列用しゃ断器7
を主要変圧器4の高圧側に設けても、また、計器用電圧
変成器8.9を図示の部所に設けなくても、等価的に並
列用しゃ断器7の前後の電圧と位相を見れる場所に設け
ればよいことは言うまでもない。In the above embodiment, the parallel circuit breaker 7 is connected to the main transformer 4.
Although we have explained the case where the circuit breaker is installed on the low pressure side of
Even if it is installed on the high voltage side of the main transformer 4, or even if the instrument voltage transformer 8.9 is not installed at the location shown in the figure, the voltage and phase before and after the parallel circuit breaker 7 can be equivalently seen. Needless to say, it is best to set it up somewhere.
また、主要変圧器4が存在しなくても本発明を同様に適
用できること、計器用電圧変成器と称したものがそれと
等価な機能を有するものであればよいことも明らかであ
る。It is also clear that the present invention can be applied in the same manner even if the main transformer 4 is not present, and that it is sufficient that the so-called instrument voltage transformer has an equivalent function.
さらに、上記では揚水発電所の同期発電電動機を電動機
として起動し電力系統へ並入する場合について説明した
が、通常の同期電動機にも本発明を適用できることは言
うまでもない。Furthermore, although the case where the synchronous generator-motor of a pumped storage power plant is started as an electric motor and connected to the power system has been described above, it goes without saying that the present invention can also be applied to a normal synchronous motor.
[発明の効果1
以上説明したように本発明によれば、静止形起動装置の
許容出力電圧を電動機定格電圧より低下して静止形起動
装置の大幅なコスト低減を図ると共に、理想的な電動機
の電力系統への同期並入を確実に行なうことが可能な同
期電動機の起動方法および装置が提供できる。[Effect of the Invention 1] As explained above, according to the present invention, the allowable output voltage of the static starter device is lowered than the motor rated voltage, thereby significantly reducing the cost of the static starter device, and realizing an ideal electric motor. A method and apparatus for starting a synchronous motor that can reliably perform synchronous connection to a power system can be provided.
第1図は、本発明の一実施例を示す構成図、第2図は第
1図における停止位相設定検出装置の一例を示す構成図
、第3図は静止形起動装置を用いた従来の電動機の起動
装置を示す構成図である。
1・・・電動機、1A・・・界磁巻線、2・・・静止形
起動装置、2B・・・順逆変換器及びその制御部、2A
・・・出力しゃ断器、2C・・・入力変圧器、2D・・
・入力しゃ断器、3・・・励磁装置、3A・・・変換器
及び制御部、3B・・・電源変圧器、4・・・主要変即
器、5・・・電力系統、6・・・所内高圧電源、7・・
・並列用しゃ断器、8.9.10・・・計器用電圧変成
器、11・・・周波数差制御装置、12・・・自動同期
装置、13・・・総合制御インターロック回路、14・
・・停止位相設定検出装置、a〜e・・・信号、f・・
・総合制御インターロック回路からの各種信号。
出願人代理人 弁理士 鈴江武彦
11動微
第1図Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a block diagram showing an example of the stop phase setting detection device in Fig. 1, and Fig. 3 is a block diagram of a conventional electric motor using a static starting device. FIG. 2 is a configuration diagram showing a startup device of FIG. DESCRIPTION OF SYMBOLS 1... Electric motor, 1A... Field winding, 2... Static starting device, 2B... Forward/reverse converter and its control unit, 2A
...Output breaker, 2C...Input transformer, 2D...
- Input breaker, 3... Excitation device, 3A... Converter and control unit, 3B... Power transformer, 4... Main transformer, 5... Power system, 6... In-house high voltage power supply, 7...
- Parallel circuit breaker, 8.9.10... Instrument voltage transformer, 11... Frequency difference control device, 12... Automatic synchronization device, 13... Comprehensive control interlock circuit, 14.
・Stop phase setting detection device, a to e... signal, f...
・Various signals from the comprehensive control interlock circuit. Applicant's agent Patent attorney Takehiko Suzue 11 Motion Picture 1
Claims (2)
止形起動装置を用いて起動するに際して、まず静止形起
動装置により同期電動機をその周波数が電力系統の周波
数よりも高くなるまで加速し、次に前記同期電動機と電
力系統の周波数差が目標周波数差になり、かつ位相差が
目標位相差になった時点で、静止形起動装置を停止して
同期電動機から切離し、しかる後に同期電動機が減速し
てくる途中で電動機電圧を上昇させ、電力系統との電圧
差、位相差、周波数差が夫々許容値以内となったことを
条件に同期電動機を電力系統へ並入するようにしたこと
を特徴とする同期電動機の起動方法。(1) When starting a synchronous motor installed in parallel to the power grid using a static starter, the static starter first accelerates the synchronous motor until its frequency becomes higher than the frequency of the power grid. Next, when the frequency difference between the synchronous motor and the power grid reaches the target frequency difference and the phase difference reaches the target phase difference, the static starter is stopped and disconnected from the synchronous motor, and then the synchronous motor is disconnected from the synchronous motor. The motor voltage is increased during deceleration, and the synchronous motor is connected to the power grid on the condition that the voltage difference, phase difference, and frequency difference with the power grid are within the allowable values. Characteristic starting method of synchronous motor.
動するための起動装置において、前記電力系統より受電
した商用周波電力を所定の周波数に変換し、当該周波数
電力にて前記同期電動機を起動する静止形起動装置と、
前記同期電動機の端子電圧の周波数と当該同期電動機が
定常運転時に接続される前記電力系統の周波数との差を
目標周波数差となるように制御し、かつ当該状態になっ
たことを検出する周波数差制御装置と、前記同期電動機
の端子電圧と前記電力系統の電圧との位相差が目標位相
差になると前記静止形起動装置の運転を停止する目標位
相差設定器、および当該位相差が目標位相差になると動
作する位相差設定器を備えてなる停止位相設定検出装置
と、前記同期電動機の端子電圧と前記電力系統の電圧と
の電圧差、周波数差が夫々許容値以内にあることを条件
に、前記同期電動機を電力系統へ並入する自動同期装置
とを備えて構成するようにしたことを特徴とする同期電
動機の起動装置。(2) In a starting device for starting a synchronous motor installed in parallel with a power grid, the commercial frequency power received from the power grid is converted to a predetermined frequency, and the synchronous motor is started with the frequency power. a static starting device for starting;
A frequency difference that controls the difference between the frequency of the terminal voltage of the synchronous motor and the frequency of the power system to which the synchronous motor is connected during steady operation to a target frequency difference, and detects that the state is reached. a control device; a target phase difference setter that stops operation of the static starter when the phase difference between the terminal voltage of the synchronous motor and the voltage of the power system reaches a target phase difference; A stop phase setting detection device comprising a phase difference setting device that operates when A starting device for a synchronous motor, characterized in that the synchronous motor includes an automatic synchronizer that connects the synchronous motor to an electric power system.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9171186A JPS62247776A (en) | 1986-04-21 | 1986-04-21 | Method and apparatus for starting synchronous motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9171186A JPS62247776A (en) | 1986-04-21 | 1986-04-21 | Method and apparatus for starting synchronous motor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62247776A true JPS62247776A (en) | 1987-10-28 |
Family
ID=14034096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9171186A Pending JPS62247776A (en) | 1986-04-21 | 1986-04-21 | Method and apparatus for starting synchronous motor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62247776A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6746211B2 (en) * | 2002-03-16 | 2004-06-08 | Lg Electronics Inc. | Operation control method utilizing resonance frequency of reciprocating compressor |
WO2019235595A1 (en) | 2018-06-07 | 2019-12-12 | 日立三菱水力株式会社 | Variable-speed power generation electric device |
WO2020013015A1 (en) | 2018-07-09 | 2020-01-16 | 日立三菱水力株式会社 | Variable-speed generator-motor device |
-
1986
- 1986-04-21 JP JP9171186A patent/JPS62247776A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6746211B2 (en) * | 2002-03-16 | 2004-06-08 | Lg Electronics Inc. | Operation control method utilizing resonance frequency of reciprocating compressor |
WO2019235595A1 (en) | 2018-06-07 | 2019-12-12 | 日立三菱水力株式会社 | Variable-speed power generation electric device |
US11223310B2 (en) | 2018-06-07 | 2022-01-11 | Hitachi Mitsubishi Hydro Corporation | Variable speed generator/motor device |
WO2020013015A1 (en) | 2018-07-09 | 2020-01-16 | 日立三菱水力株式会社 | Variable-speed generator-motor device |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2682339B1 (en) | Power distribution systems | |
CN106067695B (en) | Power distribution system | |
US7977910B2 (en) | Method of starting a synchronous motor with a brushless DC exciter | |
EP0939993B1 (en) | Isolated electrical system including asynchronous machine with prime mover and inverter/rectifier | |
US5053635A (en) | Uninterruptible power supply with a variable speed drive driving a synchronous motor/generator | |
CN107979096A (en) | A kind of excitation control method during large-scale phase modifier startup is grid-connected | |
JPS63503507A (en) | emergency power supply | |
JPS62247776A (en) | Method and apparatus for starting synchronous motor | |
US3784896A (en) | Equipment for the automatic resynchronization of a synchronous generator | |
US9467075B2 (en) | Process for switching power supply of electric engine and associated device for controlling power supply | |
JP2947831B2 (en) | Control device for AC excitation generator motor | |
JPH10313596A (en) | Pumped-storage power generation facility | |
US2512354A (en) | Braking system for alternating current motors | |
JP2943563B2 (en) | Starting control device for winding induction motor | |
US2370078A (en) | System of control for electric motors | |
RU2747785C1 (en) | Method for controlling electric power system | |
US2298134A (en) | Ship propulsion system | |
US3646415A (en) | System for starting induction motors with self-excitation | |
US1718477A (en) | Synchronizing system | |
RU2701151C1 (en) | Electromechanical insert between two power systems | |
RU2737958C1 (en) | Device for starting powerful synchronous electric motors | |
Scott et al. | Large grinding mill drives update | |
JPH044729A (en) | Reverse power flow preventive apparatus for system interconnection generator | |
US2390345A (en) | Automatic control equipment | |
SU1758816A1 (en) | Method of starting two groups of hysteresis motors |