JPS62114435A - Power converter for system interconnection - Google Patents
Power converter for system interconnectionInfo
- Publication number
- JPS62114435A JPS62114435A JP60251995A JP25199585A JPS62114435A JP S62114435 A JPS62114435 A JP S62114435A JP 60251995 A JP60251995 A JP 60251995A JP 25199585 A JP25199585 A JP 25199585A JP S62114435 A JPS62114435 A JP S62114435A
- Authority
- JP
- Japan
- Prior art keywords
- power
- frequency
- grid
- power converter
- phase 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は電力系統と電力の授受を行う系統連係用電力
変換装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power converter for power grid connection that transfers power to and from a power grid.
第4図は従来の系統連係用電力変換装置のブロック接続
図であり、図において、1は発電機、2 、は送電線
、3は基幹配電線、4は基幹開閉器、5は支線(フィー
ダー)、6は支線開閉器、7は負荷で、とれらをもって
電力系統8(以下系統と呼ぶ)と称する。9は電力発生
又は電力蓄積をする電力出力手段、10は電力変換装置
、11は連係用開閉器である。通常は、電力出力手段9
からの電力は、電力変換装置10を介して系統8との間
で授受されている。ところで、電力系統8に於てはこれ
の保守9点検、増改設の為に、開閉器4゜6を開いて、
すなわち系統解列を行って、負荷側を停電(無電圧)に
する事が多い。一方、電力変換装置10により連係され
る分散電源などは、その規模から、通常、系統の下位部
(負荷端)に設けられる場合が多い。この場合、系統の
開閉器4゜6を開いても、電力変換、1iloの出力電
圧が印加される、いわゆる逆圧という危険な状態となる
ため、系統の開閉器4,6の開放に伴ない、直ちに、連
係用開閉器11を開き、連係を解除しなければならない
。この場合、電力系統の開閉器4゜6の補助接点などに
より、連係用開閉器11を操作する方法をとると、非常
に離れた位置に多くの開閉器が設置されているため、電
線長が増大し実用的でない。Fig. 4 is a block connection diagram of a conventional power converter for grid connection. ), 6 is a branch line switch, and 7 is a load, which together are referred to as a power system 8 (hereinafter referred to as the system). 9 is a power output means for generating or accumulating power; 10 is a power conversion device; and 11 is a linkage switch. Usually, the power output means 9
The power from is exchanged with the grid 8 via the power conversion device 10. By the way, in the power system 8, for maintenance 9 inspection, expansion and modification, the switch 4°6 is opened.
In other words, the grid is often disconnected to cause a power outage (no voltage) on the load side. On the other hand, distributed power sources and the like linked by the power conversion device 10 are usually provided at a lower part (load end) of the system due to their scale. In this case, even if the grid switches 4 and 6 are opened, the output voltage of 1ilo is applied during power conversion, creating a dangerous situation called reverse pressure. , the connection switch 11 must be opened immediately to release the connection. In this case, if a method is adopted in which the interlocking switch 11 is operated using the auxiliary contact of the power system switch 4.6, the length of the electric wire will be reduced because many switches are installed at very distant locations. increased and impractical.
これに対し、本出願人は系統の開閉器4.6が開放され
、系統からの電圧印加がなくなった状態を電力変換器1
0で検出し、連係の開閉器11を開く方法を既に提案し
ている。これは第5図に示す通シである。図において、
12は半導体電力変換器(電力変換器)、13はリアク
トル、例えばリアクタンスを内蔵する変圧器、14はり
アクドル13の両端子の電圧信号5l−8sの位相差を
検出する位相差検出器(回路)、15は位相差基準信号
発生器、16は増幅器を有する位相の自動制御回路、1
7は電力変換器用制御回路、18は周波数異常検出回路
、19は周波数規定値発生器である。In contrast, the present applicant has proposed that the power converter 1
A method has already been proposed in which the detection is performed at 0 and the linked switch 11 is opened. This is the convention shown in FIG. In the figure,
12 is a semiconductor power converter (power converter); 13 is a reactor, for example, a transformer with a built-in reactance; 14 is a phase difference detector (circuit) that detects the phase difference between the voltage signals 5l-8s at both terminals of the handle 13; , 15 is a phase difference reference signal generator, 16 is an automatic phase control circuit having an amplifier, 1
7 is a power converter control circuit, 18 is a frequency abnormality detection circuit, and 19 is a frequency specified value generator.
次に動作について説明する。Next, the operation will be explained.
まず、電力変換装置lOが電力系統8に連係され、電力
の授受を行なっている状態を考える。系統の容量は電力
変換装置の容量に比べ十分大きく、又系統の発電機1の
制御によりミ力系統の周波数は、略一定に保持されてい
るため、上記電力の授受によって、系統周波数に変動を
与えない。この場合、系統側の電圧信号S2の位相を基
準とし、これに対する電力変換器12の出力信号S1の
位相差を位相差検出器14で検出し、この値が位相差基
準信号に等しくなる様に位相制御回路16が作動し、こ
の出力に応じて電力変換器の制御回路17にて、電力変
換器12の動作周波数を決定する。First, consider a state in which the power conversion device IO is linked to the power grid 8 and is transmitting and receiving power. The capacity of the grid is sufficiently large compared to the capacity of the power converter, and the frequency of the power grid is maintained approximately constant by the control of the generator 1 of the grid, so the transfer of power does not cause fluctuations in the grid frequency. I won't give it. In this case, the phase of the voltage signal S2 on the grid side is used as a reference, the phase difference of the output signal S1 of the power converter 12 with respect to this is detected by the phase difference detector 14, and the phase difference is detected so that this value becomes equal to the phase difference reference signal. The phase control circuit 16 is activated, and the power converter control circuit 17 determines the operating frequency of the power converter 12 according to this output.
即ち、出力信号Stの位相が指令値よυ進めばこれを検
知してフィードバックし、過渡的に動作周波数を下げる
と、系統の周波数は一定の為、出力信号S1の位相が遅
れ、これがフィードバックされ、指令値と等しくなる。That is, if the phase of the output signal St advances υ compared to the command value, this is detected and fed back, and when the operating frequency is transiently lowered, the phase of the output signal S1 is delayed because the system frequency is constant, and this is fed back. , becomes equal to the command value.
この結果、電力変換器の周波数は、系統周波数に追従し
、その位相は位相差指令で与えられる所定の位相差を持
って動作する。−1なお、この場合、電力変換装置10
と電力系統8との間には、上記位相差に応じた電力の授
受が行なわれていることは云うまでもない。As a result, the frequency of the power converter follows the system frequency, and the power converter operates with a predetermined phase difference given by the phase difference command. -1 In this case, the power converter 10
Needless to say, power is exchanged between the power system 8 and the power system 8 in accordance with the phase difference.
次に、系統側の開閉器6が開かれると、系統の発電機1
からの電力供給がなくなり、負荷7への電力は、電力変
換装置10からのみ供給され、この電力量に応じた位相
差が各信号S* −Ss間に生じる。この時、もし開閉
器6の開放の前後で、電力変換装置10から供給電力量
がP4P+ΔPと増加すれば、位相差検出器14の出力
θはθ→θ+Δθと増加し、その偏差にもとづき位相制
御回路16の働きにより、電力変換器12の動作周波数
fもf→f−Δfと低下する。この時、負荷端の系統側
周波数も周波数を一定にする発電機がないため、これに
追従し、負荷が一定ならθ+Δθの位相差を保持するた
め、周波数が変化した情報がフィードバックされず、こ
の結果、ますます発散的に動作周波数が低下する。この
周波数が周波数規定値発生器19が出力する所定の基準
範囲を越えた事を周波数異常検知回路18により検知し
、連係開閉器11を開放して、系統との連係を解除する
ものである。Next, when the switch 6 on the grid side is opened, the generator 1 on the grid
The power supply to the load 7 is stopped, and the power to the load 7 is supplied only from the power conversion device 10, and a phase difference corresponding to the amount of power is generated between each signal S*-Ss. At this time, if the amount of power supplied from the power converter 10 increases to P4P+ΔP before and after the switch 6 is opened, the output θ of the phase difference detector 14 increases from θ→θ+Δθ, and the phase control is performed based on the deviation. Due to the function of the circuit 16, the operating frequency f of the power converter 12 also decreases from f to f-Δf. At this time, since there is no generator that keeps the grid frequency at the load end constant, it follows this and maintains the phase difference of θ + Δθ if the load is constant, so the information on the frequency change is not fed back, and this As a result, the operating frequency decreases in an increasingly divergent manner. The frequency abnormality detection circuit 18 detects that this frequency exceeds a predetermined reference range output by the frequency regulation value generator 19, and opens the linkage switch 11 to release the linkage with the grid.
従来の系統連係用電力変換装置は以上のように構成され
ているので、もし、開閉器6を中心に左右の電力バラン
スが取れた状態に於て、開閉器6を開放すれば、当然、
電力変換装置10からの供給電力も変化せず、上記のご
とく、位相偏差に基づく発散は生じない。この場合、位
相制御ループに何らかの外乱が生じ、周波数がずれても
、系統側の周波数を固定する機能がなく、ずれはそのま
ま現われる。この結果、外乱が入シ続ければ、大幅に周
波数がずれ、これを検知して連係の解除を行うことが出
来る。しかし、この場合、その動作は外乱という不確定
要素に左右され、所定時間内に確実に連係を解除出来る
保証がなく、上記逆圧防止と云う安全対策が不確実なも
のとなるなどの問題点があった。Since the conventional power converter for grid connection is configured as described above, if the switch 6 is opened in a state where the left and right power is balanced around the switch 6, naturally,
The power supplied from the power converter 10 also does not change, and as described above, no divergence occurs due to phase deviation. In this case, even if some disturbance occurs in the phase control loop and the frequency shifts, there is no function to fix the frequency on the grid side, and the shift will appear as is. As a result, if disturbances continue to occur, the frequency will shift significantly, and this can be detected and the linkage can be canceled. However, in this case, the operation is affected by the uncertain element of disturbance, and there is no guarantee that the link can be reliably released within a predetermined time, making the safety measure of preventing back pressure mentioned above unreliable. was there.
さらに、位相差基準信号を常に変化させることにより、
負荷とのバランス状態をくずし、外乱を与える方法も提
案されているが、この場合、この外乱は、通常連係時に
おける電力授受量の変動となって、そのまま現われるた
め、制御性能が悪くなるという問題点があった。Furthermore, by constantly changing the phase difference reference signal,
A method of creating a disturbance by disrupting the balance with the load has also been proposed, but in this case, the problem is that this disturbance results in fluctuations in the amount of power exchanged during normal coordination and appears as is, resulting in poor control performance. There was a point.
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、いかなる状態における電力系統内の開閉器の
開放に対しても、所定時間内に確実にその電力系統と電
力変換装置との連係を解除できる系統連係用電力変換装
置を得ることを目的とする。This invention was made to solve the above-mentioned problems, and it ensures that the power system and the power converter are connected within a predetermined time even if a switch in the power system is opened in any state. It is an object of the present invention to obtain a power conversion device for grid connection that can cancel connection.
この発明にかかる系統連係用電力変換装置は、周期外乱
発生装置で発生した、所定振幅でかつ電力変換器の動作
周波数より十分低い周波数の信号を、周波数指令信号に
付加し、電力系統の解列時にその付加した信号にもとづ
く周波数の異常を検出し、これによって上記電力系統と
の連係をしゃ断するような構成としたものである。The power converter for power grid connection according to the present invention adds a signal generated by the periodic disturbance generator with a predetermined amplitude and a frequency sufficiently lower than the operating frequency of the power converter to a frequency command signal, and disconnects the power grid. The system is configured to occasionally detect a frequency abnormality based on the added signal, and thereby cut off the connection with the power grid.
この発明における周期外乱発生装置は、振幅が通常の系
統の動作周波数の範囲を越えるとともに、位相制御動作
に十分に応答できる周期関数の外乱信号を出力しており
、これを電力変換装置の動作周波数を決定する制御回路
の入力に加えるようにして、系統内の開閉器の開閉時に
、確実にその系統と電力変換装置との連係を解除し、逆
圧を防止するように作用する。The periodic disturbance generating device according to the present invention outputs a periodic function disturbance signal whose amplitude exceeds the operating frequency range of a normal power system and can sufficiently respond to a phase control operation. When a switch in the system is opened or closed, the connection between the system and the power converter is reliably released, and reverse pressure is prevented.
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、20は周期外乱発生回路で、位相制御回路
1Gの出力に加算する同期外乱出力信号S6を発生し、
電力変換器12の動作周波数を決定する動作周波数指令
入力の一部となる。なお、とのほかの第5図に示したも
のと同一のブロックには同一符号を付して、その重複す
る説明を省略する。また、Ssは位相差検出器14の出
力信号、S4は位相制御回路14の出力信号、Ssは周
期外乱発生回路20の出力信号、Saは電力変換器用制
御回路17への動作周波数指令信号、srは連系用開閉
路11の開放操作信号であり、これらの信号波形のタイ
ムチャートは第2図(a) 、 (b)に示す通りであ
る。An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 20 is a periodic disturbance generation circuit which generates a synchronous disturbance output signal S6 to be added to the output of the phase control circuit 1G.
It becomes part of the operating frequency command input that determines the operating frequency of the power converter 12. Note that blocks that are the same as those shown in FIG. 5 other than are given the same reference numerals, and redundant explanation thereof will be omitted. Further, Ss is the output signal of the phase difference detector 14, S4 is the output signal of the phase control circuit 14, Ss is the output signal of the periodic disturbance generation circuit 20, Sa is the operating frequency command signal to the power converter control circuit 17, and sr are opening operation signals for the interconnection switching path 11, and time charts of these signal waveforms are as shown in FIGS. 2(a) and 2(b).
次に動作について説明する。まず、はじめに電力変換装
置10が系統8に連係されている場合を考える。第5図
の従来例と同様に、電力変換器12の出力電圧信号S1
の位相とりアクドル13を隔てた系統側電圧信号S2の
位相との位相差信号s3は、位相差検出回路14で検出
される。この位相差信号S3と基準信号発生器15の基
準位相差信号との偏差を十分大きなゲインを有する位相
制御回路16に入力し、その出力S4と例えば正弦波の
ごとき周期外乱との和S6を加算器30で求め、この和
出力を電力変換器用制御回路17の動作周波数基準とし
て入力すれば、電力変換器の出力電圧信号Slはこの周
波数で動作する。電圧信号Slの位相はこの周波数を積
分したものであυ、一方、電圧信号S2の周波数は連係
により固定されている為、位相制御の閉ループが形成さ
れる。この時、位相制御回路16が上記周期外乱の変化
に十分応答し、外乱の変化する周波数帯域におけるゲイ
ンが高ければ、その入力値ははソ零、即ち、Slと82
の位相差S3は、位相M指令に等しくなυ(厳密には、
周期外乱s5のゲイン分の1の偏差を生ずるが、非常に
小さい)。Next, the operation will be explained. First, consider a case where the power conversion device 10 is linked to the grid 8. Similar to the conventional example shown in FIG. 5, the output voltage signal S1 of the power converter 12
A phase difference signal s3 with respect to the phase of the system side voltage signal S2 across the phase adjustment handle 13 is detected by the phase difference detection circuit 14. The deviation between this phase difference signal S3 and the reference phase difference signal of the reference signal generator 15 is input to the phase control circuit 16 having a sufficiently large gain, and the sum S6 of the output S4 and a periodic disturbance such as a sine wave is added. If the sum output is inputted as the operating frequency reference of the power converter control circuit 17, the output voltage signal Sl of the power converter operates at this frequency. The phase of the voltage signal Sl is the integral of this frequency υ, while the frequency of the voltage signal S2 is fixed by the linkage, so a closed loop of phase control is formed. At this time, if the phase control circuit 16 sufficiently responds to the change in the periodic disturbance and has a high gain in the frequency band where the disturbance changes, its input value is zero, that is, Sl and 82
The phase difference S3 is υ (strictly speaking,
This produces a deviation of 1/the gain of the periodic disturbance s5, but it is very small).
系統への供給電力槍は一定に安定している。この時、位
相制御回路の出力には、周期外乱母を打消す信号S4が
発生し、結局周期外乱を与えているにもかかわらず、周
波数指令信号S・は系統周波数と同じ一定値となる。The power supply to the grid is constant and stable. At this time, a signal S4 that cancels the periodic disturbance generator is generated at the output of the phase control circuit, and in the end, despite the periodic disturbance being applied, the frequency command signal S· becomes the same constant value as the system frequency.
次に、第1図の゛系統開閉856を通じて電力の授受が
行なわれていない状態について説明する。第2図(a)
において、時刻tlで上記開閉56を開いても、電力変
換装置10から系統内負荷7への電力供給状態は変わら
ず、したがって、位相差信号Ssにも何ら変化を生じな
い(すなわち、位相差指令に対応する電力量と負荷7の
消費電力量とが等しい)。この場合、位相制御回路16
の入力は全く零となυ、その出力S4は一定値に保持さ
れるか又は零となる。一方、周期外乱の出力信号Sfi
はそのまま加わり、電力変臭器用制御回路17への周波
数指令S6は、周期外乱によって大きく変化する。Next, a state in which power is not transferred through the system opening/closing 856 in FIG. 1 will be described. Figure 2(a)
, even if the switch 56 is opened at time tl, the state of power supply from the power converter 10 to the load 7 in the system does not change, and therefore, no change occurs in the phase difference signal Ss (that is, the phase difference command (The amount of power corresponding to the load 7 is equal to the amount of power consumed by the load 7). In this case, the phase control circuit 16
The input of is completely zero υ, and its output S4 is kept at a constant value or becomes zero. On the other hand, the periodic disturbance output signal Sfi
is added as is, and the frequency command S6 to the power odor changer control circuit 17 changes greatly due to the periodic disturbance.
ところが、系統開閉器6が開かれ系統側の周波数を固定
する機能は失なわれているため、電力変換器12の周波
数変化に追従し、負荷の周波数も変化し、その位相差S
3は変化しない(負荷消費室カ一定)。この結果、位相
制御ループは作動せず、電力変換装置の動作周波数には
、上記周期外乱がそのまま現われる。この為、上記周期
外乱の振幅を周波数異常検知可能な系統の正常な周波数
変動幅(通常±0.5〜IHz)より大きく選定してお
けば、周波数異常検出回路18にて、時刻t2で周波数
が周波数規定値発生器19が出力する規定値を越えたこ
とを検知し、開閉器操作信号S?を発生して、連係用開
閉器11を開き、連係を解除することが出来る。この場
合、開閉器6が開かれた時刻t1から、検知時刻h’)
では、長くても周期外乱の半サイクル程度あれば、確実
に検知出来る。However, since the grid switch 6 is opened and the function of fixing the frequency on the grid side is lost, the load frequency follows the frequency change of the power converter 12, and the phase difference S
3 does not change (load consumption room power is constant). As a result, the phase control loop does not operate, and the periodic disturbance appears as it is in the operating frequency of the power converter. Therefore, if the amplitude of the periodic disturbance is selected to be larger than the normal frequency fluctuation width (usually ±0.5 to IHz) of the system in which frequency abnormality can be detected, the frequency abnormality detection circuit 18 detects the frequency at time t2. exceeds the specified value output by the frequency specified value generator 19, and the switch operation signal S? can be generated to open the linkage switch 11 and release the linkage. In this case, from the time t1 when the switch 6 is opened to the detection time h')
Then, if the periodic disturbance is at most half a cycle, it can be reliably detected.
第2図(b)は系統開閉器6を介して電力授受をしてい
る状態において、同開閉器を開いた場合の動作波形で、
開放時に位相差指令との偏差を生じ、位相制御回路16
の出力は発散して行く。この結果、周波数基準信号S6
は周期外乱によって振動しながら発散していくことにな
シ、同様に検出出来る。FIG. 2(b) shows the operating waveform when the switch 6 is opened while power is being exchanged via the grid switch 6.
When opened, a deviation from the phase difference command occurs, and the phase control circuit 16
The output of will diverge. As a result, the frequency reference signal S6
It can be detected in the same way that it oscillates and diverges due to periodic disturbances.
第3図はこの発明による他の実施例を示すブロック接続
図で、第1図における位相差基準信号発生器15として
、電力変換器12の出力を検出する電力検出器21、電
力設定器22及び電力制御回路23が用いられ、これに
よ)電力変換装置10よ多系統8に供給する電力が設定
された所定の値に等しくなる様に位相差指令を調整する
。また、周波数異常の検出には一般の周波数異常検出リ
レー18aを用いている。さらに、周期外乱発生には、
三角波発生回路20aを用いている。また、位相差検出
回路14に入力される電力変換器12の出力信号の代υ
に、これを駆動する制御回路17からの信号を代用して
いる。これらは、各要素として、1部又は全部が第1図
の実施例に置換して用いることができる。FIG. 3 is a block connection diagram showing another embodiment according to the present invention, in which the phase difference reference signal generator 15 in FIG. A power control circuit 23 is used to adjust the phase difference command so that the power supplied from the power converter 10 to the multiple system 8 becomes equal to a predetermined value. Further, a general frequency abnormality detection relay 18a is used to detect frequency abnormalities. Furthermore, for periodic disturbance generation,
A triangular wave generating circuit 20a is used. Further, the output signal υ of the power converter 12 input to the phase difference detection circuit 14 is
The signal from the control circuit 17 that drives this is used instead. Part or all of these elements can be used in place of the embodiment shown in FIG. 1.
以上述べたように、この発明によれば、振幅が系統の周
波数変動幅より大きく、かつその周期が位相制御ループ
に十分応答できる大きさの周期外乱を、電力変換器に対
する周波数指令要素とするように構成したので、系統が
いかなる状態にあるときでも、連係時の制御特性をそこ
なわず、また系統解列時には、所定時間内にすみやかに
かつ確実に異常な動作周波数に至らしめ、これを検知す
ることにより、連係用開閉器を直ちに開いて、逆圧の危
険を効果的に回避することができるものが得られる効果
がある。As described above, according to the present invention, a periodic disturbance whose amplitude is larger than the frequency fluctuation range of the power grid and whose period is large enough to sufficiently respond to the phase control loop is used as a frequency command element for the power converter. The system is configured to ensure that no matter what state the grid is in, the control characteristics during linkage will not be impaired, and when the grid is disconnected, it will quickly and reliably reach an abnormal operating frequency within a predetermined time, and this will be detected. By doing so, the linking switch can be opened immediately and the risk of back pressure can be effectively avoided.
第1図はこの発明の一実施例による系統連係用電力変換
装置のブロック接続図、第2図は系統解列の有無の各状
態における上記各ブロックの信号波形を示すタイムチャ
ート、第3図は他の実施例のブロック接続図、第4図は
電力変換システムの一般的構成を示すブロック接続図、
第5図は従来の電力変換装置のブロック接続図である。
8は電力系統、9は電力出力手段、10は電力変換装置
、11は連系用開閉器、12は電力変換器、13はリア
クトル、14は位相差検出回路、15は位相差基準信号
発生器、16は位相制御回路、17は電力変換器の制御
回路、18は周波数異常検出回路、19は周波数規定値
発生器、20は周期外乱発生回路である。
なお、図中、同一符号は同一、又は相当部分を示す。
特許出願人 三菱電機株式会社
代理人 弁理士 1) 澤 博 昭(外2名)
L −−−−w
第2図(a)
1t2FIG. 1 is a block connection diagram of a power converter for grid connection according to an embodiment of the present invention, FIG. 2 is a time chart showing signal waveforms of each block in each state with and without grid disconnection, and FIG. A block connection diagram of another embodiment, FIG. 4 is a block connection diagram showing the general configuration of a power conversion system,
FIG. 5 is a block connection diagram of a conventional power conversion device. 8 is a power system, 9 is a power output means, 10 is a power converter, 11 is a grid connection switch, 12 is a power converter, 13 is a reactor, 14 is a phase difference detection circuit, and 15 is a phase difference reference signal generator. , 16 is a phase control circuit, 17 is a power converter control circuit, 18 is a frequency abnormality detection circuit, 19 is a frequency specified value generator, and 20 is a periodic disturbance generation circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Co., Ltd. Agent Patent attorney 1) Hiroshi Sawa (2 others) L ----w Figure 2 (a) 1t2
Claims (1)
力電圧位相の、上記電力系統側の電圧位相に対する出力
位相差と、予め設定した位相差基準指令値との偏差を周
波数指令として、上記電力変換器の動作周波数を決定す
る系統連係用電力変換装置において、上記周波数指令に
対して、所定振幅でかつ上記動作周波数より十分低い周
波数の信号を付加する周期外乱発生装置を設け、上記電
力系統の解列によりこの電力系統から供給される電圧が
なくなつたとき、上記付加した信号にもとづく周波数の
異常を検出し、上記電力系統との連係をしや断すること
を特徴とする系統連係用電力変換装置。The above-mentioned power conversion is performed using the deviation between the output voltage phase of the power converter connected to the power grid via the reactor with respect to the voltage phase on the power grid side and a preset phase difference reference command value as a frequency command. In a power converter for grid connection that determines the operating frequency of a power system, a periodic disturbance generator is provided that adds a signal with a predetermined amplitude and a frequency sufficiently lower than the operating frequency to the frequency command, and A power conversion system for power grid connection, characterized in that when the voltage supplied from the power grid disappears due to a power grid, an abnormality in the frequency based on the added signal is detected and the connection with the power grid is interrupted. Device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60251995A JPS62114435A (en) | 1985-11-12 | 1985-11-12 | Power converter for system interconnection |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60251995A JPS62114435A (en) | 1985-11-12 | 1985-11-12 | Power converter for system interconnection |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62114435A true JPS62114435A (en) | 1987-05-26 |
JPH0410302B2 JPH0410302B2 (en) | 1992-02-24 |
Family
ID=17231080
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60251995A Granted JPS62114435A (en) | 1985-11-12 | 1985-11-12 | Power converter for system interconnection |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62114435A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63287328A (en) * | 1987-05-18 | 1988-11-24 | Central Res Inst Of Electric Power Ind | Counter charge preventing method for connected commercial frequency power line using distributed power source |
EP0444666A2 (en) * | 1990-03-02 | 1991-09-04 | Mitsubishi Denki Kabushiki Kaisha | Interconnection for electric power system |
JPH03239124A (en) * | 1990-02-16 | 1991-10-24 | Shikoku Sogo Kenkyusho:Kk | System and device for preventing reverse charging of dispersed power supply |
JP2006296105A (en) * | 2005-04-12 | 2006-10-26 | Kyoto Univ | Monitoring system and monitoring method of natural frequency of power system |
-
1985
- 1985-11-12 JP JP60251995A patent/JPS62114435A/en active Granted
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63287328A (en) * | 1987-05-18 | 1988-11-24 | Central Res Inst Of Electric Power Ind | Counter charge preventing method for connected commercial frequency power line using distributed power source |
JPH03239124A (en) * | 1990-02-16 | 1991-10-24 | Shikoku Sogo Kenkyusho:Kk | System and device for preventing reverse charging of dispersed power supply |
EP0444666A2 (en) * | 1990-03-02 | 1991-09-04 | Mitsubishi Denki Kabushiki Kaisha | Interconnection for electric power system |
JPH03256533A (en) * | 1990-03-02 | 1991-11-15 | Shikoku Sogo Kenkyusho:Kk | System linkage system |
US5111377A (en) * | 1990-03-02 | 1992-05-05 | Shikoku Research Institute Incorporated | Interconnection for electric power system |
EP0444666B1 (en) * | 1990-03-02 | 1995-12-06 | Mitsubishi Denki Kabushiki Kaisha | Interconnection for electric power system |
JP2006296105A (en) * | 2005-04-12 | 2006-10-26 | Kyoto Univ | Monitoring system and monitoring method of natural frequency of power system |
JP4664113B2 (en) * | 2005-04-12 | 2011-04-06 | 国立大学法人京都大学 | System and method for monitoring natural frequency of power system |
Also Published As
Publication number | Publication date |
---|---|
JPH0410302B2 (en) | 1992-02-24 |
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