JPS6295933A - Service interruption detector - Google Patents
Service interruption detectorInfo
- Publication number
- JPS6295933A JPS6295933A JP60233971A JP23397185A JPS6295933A JP S6295933 A JPS6295933 A JP S6295933A JP 60233971 A JP60233971 A JP 60233971A JP 23397185 A JP23397185 A JP 23397185A JP S6295933 A JPS6295933 A JP S6295933A
- Authority
- JP
- Japan
- Prior art keywords
- power
- inverter
- inverter device
- grid
- current
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
Landscapes
- Inverter Devices (AREA)
- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (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、商用電力系統のような既存電力系統に連系
する系統連系インバータ装置の停電検知方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power outage detection method for a grid-connected inverter device connected to an existing power system such as a commercial power system.
一般に、個人住宅用太陽光発電システム等、配電系統の
低圧側、すなわち商用電力系統に連系される小規模分散
層電源においては、システム自体に十分な信頼度が要求
され、電力系統へ悪影響を及ぼさないことが必要である
。In general, small-scale distributed layer power sources connected to the low-voltage side of the power distribution system, such as solar power generation systems for private residences, or the commercial power system, require sufficient reliability in the system itself, and have no negative impact on the power system. It is necessary that the
たとえば、太陽光発電システムのインバータ装置を商用
電力系統と連系して負荷に電力を供給する系統並列運転
では、電力系統の停電時にインバータ装置を電力系統か
ら解列し、インバータ装置から電力系統への逆送電力を
速やかに阻止する必要がある。For example, in grid parallel operation where the inverter device of a solar power generation system is connected to the commercial power grid to supply power to the load, in the event of a power outage, the inverter device is disconnected from the power grid, and the inverter device is connected to the power grid. It is necessary to promptly prevent the reverse power transmission.
そして、この場合の電力系統の停電検知は、負荷電圧を
検出することにより可能であるが、インバータ装置から
負荷電力の大部分を供給する場合には、停電時において
も負荷電圧が差程変化しないため停電の検知が困難であ
る。In this case, it is possible to detect a power outage in the power system by detecting the load voltage, but if most of the load power is supplied from an inverter, the load voltage does not change significantly even during a power outage. Therefore, it is difficult to detect power outages.
そこで、従来では、たとえば特開昭６０−１８７２６５
号公報に示されているように、正常時においてインバー
タ電流を負荷電流より小さくして系統並列運転を行ない
、負荷電流の値に対してインバータ電流の値が上回るか
または同一のとき、電力系統が停電状態にあると判断す
るようにしている。Therefore, conventionally, for example, Japanese Patent Application Laid-Open No. 60-187265
As shown in the publication, when the inverter current is made smaller than the load current during normal power grid parallel operation, and the value of the inverter current is greater than or equal to the value of the load current, the power grid It is assumed that there is a power outage.
しかし、この方法では、インバータ装置の電流値に制限
を設けることで停電検知を行なうため、太陽光発電シス
テム等の小規模分散形電源の運転効率、システム効率が
下がるといった問題点がある。However, in this method, since power outage is detected by setting a limit on the current value of the inverter device, there is a problem that the operating efficiency and system efficiency of a small-scale distributed power source such as a solar power generation system are reduced.
そこで、この発明においては、システム効率を下げるこ
となく確実な停電検知を行ない得る停電検知方法を提供
することを技術的課題とする。Therefore, a technical object of the present invention is to provide a power outage detection method that can reliably detect a power outage without reducing system efficiency.
この発明は、既存電力系統と連系して負荷に電力を供給
する系統連系インバータ装置の停電検知方法において、
前記インバータ装置を、インバータ電流の位相が前記電
力系統の系統電圧の位相に一致しかつ出力電力が最大に
なるよう制御し、前記系統電圧とＲ記インバータ電流と
の位相ずれに、より前記電力系統の停電を検知し、前記
インバータ装置を前記電力系統から解列することを特徴
とするものである。This invention provides a power outage detection method for a grid-connected inverter device that connects with an existing power system and supplies power to a load.
The inverter device is controlled so that the phase of the inverter current matches the phase of the system voltage of the power system and the output power is maximized, and the phase difference between the system voltage and the R inverter current is The invention is characterized in that it detects a power outage and disconnects the inverter device from the power system.
したがって、この発明の停電検知方法では、正常時、イ
ンバータ装置が、インバータ電流の位相を既存電力系統
の系統電圧の位相に一致させかつ出力電力、すなわちイ
ンバータ電流を最大にするよう制御され、太陽光発電シ
ステム等から最大電力を取り出すことが可能となるため
、システムが効率よく運用され、このとき、負荷が消費
する無効電力はすべて電力系統より供給される。Therefore, in the power outage detection method of the present invention, under normal conditions, the inverter device is controlled to match the phase of the inverter current with the phase of the grid voltage of the existing power system and maximize the output power, that is, the inverter current, and Since maximum power can be extracted from the power generation system, etc., the system can be operated efficiently, and at this time, all the reactive power consumed by the load is supplied from the power system.
そして、電力系統の停電時、負荷の状態により系統電圧
、すなわち負荷電圧が変動することによりインバータ装
置より負荷へ無効電力が供給され、系統電圧（負荷電圧
）とインバータ電流とに位相ずれが生じ、この位相ずれ
の検出により系統停電が検知され、インバータ装置が電
力系統および負荷より解列される。During a power outage in the power system, the grid voltage, that is, the load voltage, fluctuates depending on the load condition, so reactive power is supplied from the inverter to the load, causing a phase shift between the grid voltage (load voltage) and the inverter current. By detecting this phase shift, a system power outage is detected, and the inverter device is disconnected from the power system and the load.
つぎに、この発明を、その１実施例を示した図面ととも
に詳細に説明する。Next, the present invention will be described in detail with reference to drawings showing one embodiment thereof.
まず、第１図は個人住宅用太陽光発電システムの構成を
示してお９、（１）はノーヒユーズブレーカ＋２１が介
設された既存電力系統となる商用電力系統、（３）は家
庭用負荷、（４）け太陽電池、（５）は逆流防止用ダイ
オード、（６）はダイオード（５］を介して入力された
太陽電池（４）の発電電力を交流に変換するインバータ
装置であり、該インバータ装置（６）は絶縁用トランス
（７）およびサイリスクスイッチ（８）を介して電力系
統（１）に連系され、インバータ装置（６）からの交流
電力が電力系統（１）および負荷（３）に供給される。First, Figure 1 shows the configuration of a solar power generation system for private residence9. (1) is the commercial power system that is the existing power system with a no-fuse breaker +21 installed, and (3) is the residential load. , (4) is a solar cell, (5) is a backflow prevention diode, and (6) is an inverter device that converts the generated power of the solar cell (4) inputted via the diode (5) into alternating current. The inverter device (6) is connected to the electric power system (1) via the isolation transformer (7) and the sirisk switch (8), and the AC power from the inverter device (6) is connected to the power system (1) and the load ( 3).
（９）はインバータ電流を検出する変流器、ｉｌＧは電
力系統の系統電圧を検出する電圧変成器、αυは変流器
（９）からの検出電流および電圧変成器αＯからの検出
電圧がそれぞれ入力されインバータ電流の位相が系統電
圧の位相に一致するようインバータ装置（６）のゲート
回路（６）を制御する制御回路でおり、該制御回路０１
Ｊは、インバータ電流の電流値に制限を設けることなく
、インバータ装置（６）の出力電力（有効電力）が常に
最大になるような制御、すなわちインバータ電流を最大
にするような制御を同時に行なっており、太陽型ｆｉ
ｆｌｌから最大電力を取ジ出すことが可能となっている
。なお、前記サイリスクスイッチ（８）はそのオン、オ
フが制御回路（１υにより制御され、インバータ装＠（
６）が電力系統（１）に対して連系、解列される。(9) is a current transformer that detects the inverter current, ilG is a voltage transformer that detects the grid voltage of the power system, and αυ is the detected current from the current transformer (9) and the detected voltage from the voltage transformer αO, respectively. This is a control circuit that controls the gate circuit (6) of the inverter device (6) so that the phase of the input inverter current matches the phase of the grid voltage, and the control circuit 01
J simultaneously performs control such that the output power (active power) of the inverter device (6) is always maximized without setting a limit on the current value of the inverter current, that is, control that maximizes the inverter current. solar type fi
It is possible to extract maximum power from the fll. In addition, the on/off of the silisk switch (8) is controlled by a control circuit (1υ), and the inverter unit @(
6) is connected to and disconnected from the power grid (1).
そして、前記制御回路圓によりインバータ装置（６）を
制御した場合、系統電圧Ｅｃ 、インバータ電流１１お
よび負荷電流ｉｅはそれぞれ第２図のベクトル図に示す
ようになる。When the inverter device (6) is controlled by the control circuit circle, the system voltage Ec, the inverter current 11, and the load current ie are as shown in the vector diagram of FIG. 2, respectively.
この電力系統＋１１とインバータ装置（６）との系統並
列運転状態では、第２図より明らかなように、家庭用負
荷（３）で消費される無効電力はすべて電力系統（１）
より供給されることになる。In this system parallel operation state of the power system +11 and the inverter device (6), as is clear from Fig. 2, all the reactive power consumed by the household load (3) is transferred to the power system (1).
More will be supplied.
つぎに、第３図は電力系統（１）の停電時におけるベク
トル図を示しており、系統電圧幅（負荷電圧Ｅｔりが負
荷（３）の状態、すなわち負荷（３）がＣを含むかＬを
含むかにより下降あるいは上昇し、インバータ装置（６
）より負荷（３）へ無効電力が供給されるようになり、
この結果、系統電圧ＥＣとインバータ電流Ｉｉとに位相
ずれが生じる。Next, Figure 3 shows a vector diagram at the time of a power outage in the power system (1). The inverter device (6
) now supplies reactive power to load (3),
As a result, a phase shift occurs between the grid voltage EC and the inverter current Ii.
したがって、制御回路Ｇ℃では、変流器（９）および電
圧変成４叫を介してインバータ電流と系統電圧との位相
ずれを検品することにより電力系統（１）の停電を検知
し、サイリスタスイッチ（８）を制御してインバータ装
置（６）を速やかに電力系統（１）および負荷（３）か
ら解列し、これにより、インバータ装置（６）から電力
系統（１）への逆圧が防止される。Therefore, the control circuit G°C detects a power outage in the power grid (1) by inspecting the phase shift between the inverter current and the grid voltage via the current transformer (9) and the voltage transformer (4), and detects a power outage in the power grid (1). 8) to quickly disconnect the inverter device (6) from the power grid (1) and the load (3), thereby preventing back pressure from the inverter device (6) to the power grid (1). Ru.
以上のように、この発明の停電検知方法によると、電力
系統と連系するインバータ装置のインバータ電流の位相
と系統電圧の位相とが一致するようインバータ装置を制
御し、両者の位相ずれを検出することにより、系統停電
を確実に検知し、インバータ装置を電力系統から速やか
に解列することができるものであり、しかも、インバー
タ装置を出力電力が常に最大になるよう制御できるため
、太陽光発電システム等を効率よく運用できる効果が得
られるものである。As described above, according to the power outage detection method of the present invention, the inverter device is controlled so that the phase of the inverter current of the inverter device connected to the power grid matches the phase of the grid voltage, and the phase shift between the two is detected. This makes it possible to reliably detect grid power outages and quickly disconnect the inverter from the power grid.Furthermore, the inverter can be controlled so that the output power is always at its maximum, making it ideal for photovoltaic power generation systems. etc. can be effectively operated.
図面はこの発明の停電検知方法の１実施例を示し、第１
図は個人住宅用太陽光発電システムの構成図、第２図お
よび第３図はそれぞれ商用電力系統の通電時および停電
時における第１図の各部の電圧、電流のベクトル図であ
る。
（１）・・・商用電力系統、（３）・・・負荷、（６）
・インバータ装置。The drawings show one embodiment of the power outage detection method of the present invention.
The figure is a configuration diagram of a solar power generation system for a private residence, and FIGS. 2 and 3 are vector diagrams of voltage and current at each part of FIG. 1 when the commercial power system is energized and during a power outage, respectively. (1)...Commercial power system, (3)...Load, (6)
・Inverter device.
Claims (1)
統連系インバータ装置の停電検知方法において、前記イ
ンバータ装置を、インバータ電流の位相が前記電力系統
の系統電圧の位相に一致しかつ出力電力が最大になるよ
う制御し、前記系統電圧と前記インバータ電流との位相
ずれにより前記電力系統の停電を検知し、前記インバー
タ装置を前記電力系統から解列することを特徴とする停
電検知方法。(1) In a power outage detection method for a grid-connected inverter device that is interconnected with an existing power system and supplies power to a load, the inverter device is A power outage detection method comprising: controlling output power to a maximum; detecting a power outage in the power system based on a phase shift between the system voltage and the inverter current; and disconnecting the inverter device from the power system. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60233971A JPS6295933A (en) | 1985-10-19 | 1985-10-19 | Service interruption detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60233971A JPS6295933A (en) | 1985-10-19 | 1985-10-19 | Service interruption detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6295933A true JPS6295933A (en) | 1987-05-02 |
| JPH0559656B2 JPH0559656B2 (en) | 1993-08-31 |
Family
ID=16963506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60233971A Granted JPS6295933A (en) | 1985-10-19 | 1985-10-19 | Service interruption detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6295933A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63187588U (en) * | 1987-05-26 | 1988-12-01 | ||
| JPH0191671A (en) * | 1987-09-30 | 1989-04-11 | Toshiba Corp | System linkage inverter device |
| JPH01177832A (en) * | 1988-01-05 | 1989-07-14 | Toshiba Corp | Power storage system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56101335A (en) * | 1980-01-14 | 1981-08-13 | Meidensha Electric Mfg Co Ltd | Independent operation detector |
| JPS56107742A (en) * | 1980-01-25 | 1981-08-26 | Hitachi Ltd | Power source |
| JPS5740373A (en) * | 1980-08-22 | 1982-03-05 | Fuji Electric Co Ltd | Power supply system |
| JPS5869470A (en) * | 1981-10-21 | 1983-04-25 | Fuji Electric Co Ltd | Control circuit for system interlocking inverter |
| JPS58190237A (en) * | 1982-04-27 | 1983-11-07 | 中部電力株式会社 | Power distribution system parallel connection system for decentralized power sources |
-
1985
- 1985-10-19 JP JP60233971A patent/JPS6295933A/en active Granted
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56101335A (en) * | 1980-01-14 | 1981-08-13 | Meidensha Electric Mfg Co Ltd | Independent operation detector |
| JPS56107742A (en) * | 1980-01-25 | 1981-08-26 | Hitachi Ltd | Power source |
| JPS5740373A (en) * | 1980-08-22 | 1982-03-05 | Fuji Electric Co Ltd | Power supply system |
| JPS5869470A (en) * | 1981-10-21 | 1983-04-25 | Fuji Electric Co Ltd | Control circuit for system interlocking inverter |
| JPS58190237A (en) * | 1982-04-27 | 1983-11-07 | 中部電力株式会社 | Power distribution system parallel connection system for decentralized power sources |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63187588U (en) * | 1987-05-26 | 1988-12-01 | ||
| JPH0191671A (en) * | 1987-09-30 | 1989-04-11 | Toshiba Corp | System linkage inverter device |
| JPH01177832A (en) * | 1988-01-05 | 1989-07-14 | Toshiba Corp | Power storage system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0559656B2 (en) | 1993-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |