JPH0559656B2 - - Google Patents
Info
- Publication number
- JPH0559656B2 JPH0559656B2 JP60233971A JP23397185A JPH0559656B2 JP H0559656 B2 JPH0559656 B2 JP H0559656B2 JP 60233971 A JP60233971 A JP 60233971A JP 23397185 A JP23397185 A JP 23397185A JP H0559656 B2 JPH0559656 B2 JP H0559656B2
- Authority
- JP
- Japan
- Prior art keywords
- power
- grid
- inverter
- voltage
- inverter device
- 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.)
- Expired - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 8
- 230000010363 phase shift Effects 0.000 claims description 7
- 238000010248 power generation Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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)
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
れる小規模分散形電源においては、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 power sources that are 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, in the past, for example, JP-A-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つた問題点があ
る。 However, this method detects a power outage by setting a limit on the current value of the inverter, so
There is a problem in that the operating efficiency and system efficiency of small-scale distributed power sources such as solar power generation systems decrease.
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
検知方法を得供することを技術的課題とする。
Therefore, it is a technical object of the present invention to provide a power outage detection method that can reliably detect power outages 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で、インバー
タ電流の位相が前記電力系統との連系点での電圧
の位相に一致し、かつ出力電力が最大になるよう
に制御し、該制御にかかわらず発生した前記連系
点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
ものである。
This invention provides 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, in which the phase of an inverter current in the inverter device is set to a voltage at a point of connection with the power system. The power outage in the power system is detected by the phase shift between the interconnection point voltage and the inverter current that occurs regardless of the control, and the inverter The present invention is characterized in that the device is disconnected from the power system.
本発明の停電検知方法によれば、電力系統との
連系並列運転状態では、インバータ装置が、イン
バータ電流の位相を電力系統との連系点での電
圧、即ち系統電圧の位相に一致させ、かつ出力電
力、即ちインバータ電流が最大になるように制御
するので、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り、システムを効率よく
運用できると共に、負荷が消費する無効電力は全
て電力系統から供給される。
According to the power outage detection method of the present invention, in a state of interconnection parallel operation with the power grid, the inverter device matches the phase of the inverter current with the voltage at the interconnection point with the power grid, that is, the phase of the grid voltage; In addition, since the output power, that is, the inverter current, is controlled to the maximum, it is possible to extract the maximum power from the solar power generation system, etc., and the system can be operated efficiently, and all the reactive power consumed by the load is transferred to the power grid. Supplied from.
そして、電力系統の停電時には、負荷で消費さ
れる無効電力はインバータ装置から供給され、そ
の結果、電力系統との連系点での電圧、即ち負荷
電力とインバータ電流との位相を一致させること
ができなくなる。従つて、電力系統との連系点電
圧とインバータ電流との位相ずれの検出により電
力系統の停電を認識し、インバータ装置を電力系
統および負荷から解列する。 In the event of a power outage in the power grid, the reactive power consumed by the load is supplied from the inverter device, and as a result, it is possible to match the voltage at the connection point with the power grid, that is, the phase of the load power and inverter current. become unable. Therefore, a power outage in the power grid is recognized by detecting a phase shift between the interconnection point voltage with the power grid and the inverter current, and the inverter device is disconnected from the power grid 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
の構成を示しており、１はノーヒユーズブレーカ
２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は太陽電池、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およびサイリスタスイツチ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 residences, where 1 is a commercial power system that is an existing power system in which a no-fuse breaker 2 is installed, 3 is a household load, and 4 is a photovoltaic battery. , 5 is a backflow prevention diode, and 6 is an inverter device that converts the power generated by the solar cell 4 inputted through the diode 5 into alternating current. It is connected to the power grid 1 , and AC power from the inverter device 6 is supplied to the power grid 1 and the load 3 .
９はインバータ電流を検出する変流器、１０は
電力系統との連系での電圧を検出する電力変成
器、１１は変流器９からの検出電流および電圧変
成器１０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１２を制御する
制御回路であり、該制御回路１１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つており、太陽電池
１１から最大電力を取り出すことが可能となつて
いる。なお、前記サイリスタスイツチ８はそのオ
ン、オフが制御回路１１により制御され、インバ
ータ装置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, 10 is a power transformer that detects the voltage in connection with the power grid, and 11 is a current transformer that detects the current from the current transformer 9 and a voltage that detects the voltage from the voltage transformer 10, respectively. This is a control circuit that controls the gate circuit 12 of the inverter device 6 so that the phase of the input inverter current matches the phase of the grid voltage. Control is performed such that the output power (active power) of solar cell 6 is always maximized, that is, control is performed to maximize the inverter current, making it possible to extract the maximum power from solar cell 11. The thyristor switch 8 is turned on and off by a control circuit 11, and the inverter device 6 is connected to and disconnected from the power system 1.
そして、前記制御回路１１によりインバータ装
置６を制御した場合、連系点電圧Ｅ・ｃインバータ
電流Ｉ・ｉおよび負荷電流Ｉ・ｌ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 11, the interconnection point voltage E.c, the inverter current I.i and the load current I.l are as shown in the vector diagram of FIG. 2, respectively.
この電力系統１とインバータ装置６との連系並
列運転状態では、第２図から明らかなように、連
系点電圧Ｅ・ｃ、即ち系統電圧とインバータ電流Ｉ・
ｉとの位相が一致、即ちインバータ装置６から有
効電力のみが出力るように制御されているため、
家庭内負荷３で消費される無効電力は全て電力系
統１から供給されることになる。また、負荷電流
Ｉ・ｌは、負荷３がＣ成分かＬ成分を含むため、連
系点電圧Ｅ・ｃに対して位相ずれを有している。
尚、第２図ではＬ成分を含む場合を示している。 In this interconnected parallel operation state of the power system 1 and the inverter device 6, as is clear from FIG. 2, the interconnection point voltage E.c.
Since the inverter device 6 is controlled so that only the active power is output from the inverter device 6,
All of the reactive power consumed by the domestic loads 3 will be supplied from the power system 1. Further, the load current I·l has a phase shift with respect to the interconnection point voltage E·c because the load 3 includes a C component or an L component.
Note that FIG. 2 shows the case where the L component is included.
次に、第３図は電力系統１の停電時におけるベ
クトル図を示している。電力系統１の停電時には
系統側のインバータ装置６との連系線路が開放状
態となるため、負荷３で消費される無効電力は電
力系統１から供給されなくなり、負荷３で消費さ
れる有効電力、及び無効電力の全てがインバータ
装置６から供給されることになる。従つて、第３
図に示すように、インバータ電流Ｉ・ｉは負荷電流
Ｉ・ｌと同じとなり、制御回路１１の制御によりイ
ンバータ電流Ｉ・ｉの位相制御ができなくなる。そ
して、この結果、インバータ電流Ｉ・ｉは連系点電
圧Ｅ・ｃ、即ち負荷電圧Ｅ・ｌに対して常時、位相ず
れが生じることになる。 Next, FIG. 3 shows a vector diagram when the power system 1 is out of power. During a power outage in the power grid 1, the interconnection line with the inverter device 6 on the grid side becomes open, so the reactive power consumed by the load 3 is no longer supplied from the power grid 1, and the active power consumed by the load 3, and reactive power are all supplied from the inverter device 6. Therefore, the third
As shown in the figure, the inverter current I·i becomes the same as the load current I·l, and the phase control of the inverter current I·i becomes impossible under the control of the control circuit 11. As a result, the inverter current I.i always has a phase shift with respect to the interconnection point voltage E.c, that is, the load voltage E.l.
したがつて、制御回路１１では、変流器９およ
び電圧変成器１０を介してインバータ電流と系統
電圧との位相ずれを検出することにより電力系統
１の停電を検知し、サイリスタスイツチ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 11 detects a power outage in the power system 1 by detecting the phase shift between the inverter current and the system voltage via the current transformer 9 and the voltage transformer 10, and controls the thyristor switch 8. The inverter device 6 is quickly disconnected from the power system 1 and the load 3, thereby preventing back pressure from the inverter device 6 to the power system 1.
以上のように、この発明の停電検知方法による
と、インバータ装置の出力電力が常に最大になる
ように制御され、太陽光発電システム等を効率よ
く運用することが可能となる。
As described above, according to the power outage detection method of the present invention, the output power of the inverter device is controlled so as to always be maximized, making it possible to efficiently operate a solar power generation system and the like.
また、電力系統の停電時には、負荷で消費され
る無効電力はインバータ装置から供給され、その
結果、電力系統との連系点での電圧、即ち負荷電
圧とインバータ電流との位相を一致させることが
できなくなる。従つて、電力系統との連系点電圧
とインバータ電流との位相ずれを検出することに
より、電力系統の停電を確実に検知すると共に、
系統の停電後速やかにインバータ装置を系統から
解列することができる。 In addition, in the event of a power outage in the power grid, the reactive power consumed by the load is supplied from the inverter device, and as a result, it is possible to match the phase of the voltage at the connection point with the power grid, that is, the load voltage, and the inverter current. become unable. Therefore, by detecting the phase shift between the voltage at the connection point to the power grid and the inverter current, power outages in the power grid can be reliably detected, and
The inverter device can be disconnected from the grid immediately after a power outage in the grid.
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, and FIG. 1 is a configuration diagram of a solar power generation system for a private residence, and FIGS. 1 is a vector diagram of voltage and current at each part in FIG. 1...Commercial power system, 3...Load, 6...Inverter device.
Claims (1)
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
相が前記電力系統との連系点での電圧の位相に一
致し、かつ出力電力が最大になるように制御し、
該制御にかかわらず発生した前記連系点電圧と前
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 connects with an existing power grid and supplies power to a load, the inverter device is connected to a power grid where the phase of the inverter current matches the phase of the voltage at the point of connection with the power grid. control so that they match and the output power is maximized,
A power outage detection method, characterized in that a power outage in the power system is detected based on a phase shift between the interconnection point voltage and the inverter current that occurs regardless of the control, and the inverter device is disconnected 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 JPS6295933A (en) | 1987-05-02 |
| JPH0559656B2 true 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) |
Families Citing this family (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 |
| JP2653450B2 (en) * | 1988-01-05 | 1997-09-17 | 株式会社東芝 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6295933A (en) | 1987-05-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |