JP3528879B2 - Automatic voltage adjustment method for photovoltaic power converter - Google Patents
Automatic voltage adjustment method for photovoltaic power converterInfo
- Publication number
- JP3528879B2 JP3528879B2 JP11857295A JP11857295A JP3528879B2 JP 3528879 B2 JP3528879 B2 JP 3528879B2 JP 11857295 A JP11857295 A JP 11857295A JP 11857295 A JP11857295 A JP 11857295A JP 3528879 B2 JP3528879 B2 JP 3528879B2
- Authority
- JP
- Japan
- Prior art keywords
- power
- voltage
- power converter
- adjustment method
- 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.)
- Expired - Fee Related
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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は太陽電池の発電電力を交
流電力に変換し、交流電力を電力系統へ送電する太陽発
電用電力変換装置の自動電圧調整方法に関する。
【０００２】
【従来の技術】この種の太陽光発電用電力変換装置にお
いて、電力変換装置が電力系統へ電力を送電する場合
に、電力変換装置と電力系統とがつながる受電点の電圧
は、電力系統の送電線のインピーダンスによって、送電
を行わない場合に比べて上昇する。柱上変圧器から受電
点までが遠く送電線のインピーダンスが大きい場合や、
送電電力が送電線の容量を越える程大きい場合には、受
電点の電圧がここにつながる負荷の電圧許容値を越えて
上昇し、負荷に悪影響を及ぼすおそれがある。従来、こ
の電圧上昇を抑制するために、電圧上昇を検出して電力
変換装置の出力を減少させるか、電力変換装置の出力電
流の位相を受電点電圧の位相よりも進める方法（進相無
効電力制御）がとられていた。
【０００３】図３は従来の進相無効電力制御を用いた自
動電圧調整方法を説明するベクトル図である。太陽光発
電用電力変換装置は通常、受電点電圧との力率が１とな
るように電流を出力する。ここで簡単にするため送電線
のインピーダンスが純抵抗だと仮定すると、このときの
ベクトル図は図４のように電流Ｉo と送電線の電圧降下
ｄＶの位相は一致し、受電点電圧Ｖo の絶対値をＶo １
（＝｜Ｖo ｜）、電力系統の電圧をＶ１とすれば、Ｖo
１＝｜Ｖ１｜＋｜ｄＶ｜になる。また、図５のように電
力変換装置の出力電流Ｉo の位相を受電点電圧Ｖo に対
して進めた（位相差をαとする）場合の受電点電圧Ｖo
の絶対値をＶo ２（＝｜Ｖo ｜）とすると、｜Ｖ１｜と
｜ｄＶ｜の大きさは力率１の場合と等しいが、図５のよ
うにＶ１とｄＶに角度が付くので、Ｖo ２＜Ｖo １とな
って、受電点電圧Ｖo の電圧上昇を抑えることができ
る。送電線インピーダンスが純抵抗でない場合（図３）
でも基本的には前記の原理によって受電点電圧Ｖo の抑
制が可能である。しかし、この従来の進相無効電力制御
では電流を進めることによって、インバータから出力さ
れる有効電流が減少し、電力系統へ送電する有効電流も
進相前のＰ１＝｜Ｖo ｜×｜Ｉ o ｜からＰ２＝｜Ｖo ｜
×｜Ｉo ｜×ｃｏｓ αに減少して、太陽電池の発電電
力を有効に系統へ送ることができなくなるという問題が
あった。
【０００４】本発明の目的は、受電点の電圧上昇を抑制
するとともに、太陽電池の発電電力を電力系統に有効に
送電できる、太陽光発電用電力変換装置の自動電圧調整
方法を提供することにある。
【０００５】
【課題を解決するための手段】上記問題を解決するため
に、本発明の太陽光発電用電力変換装置の自動電圧調整
方法は、電力変換装置と電力系統が接続される受電点の
電圧上昇を、電力変換装置の有効電流出力を一定に保ち
ながら進相無効電流を流すことによって抑制することを
特徴とする。
【０００６】
【作用】有効電流を一定にしたまま進相無効電流を流す
ことで、電力系統に送電する電力を減少させずに受電点
の電圧上昇を抑制できるため、太陽電池の発電電力を有
効に利用できる。
【０００７】
【実施例】次に、本発明の実施例について図面を参照し
て説明する。図１は太陽光発電用電力変換装置と電力系
統との接続図、図２は電圧と電流の位相を示すベクトル
図である。電力変換装置２は太陽電池１の発電電力を交
流電力に変換し、送電線４を経て電力系統３に送電す
る。送電線４には負荷５が接続されている。電力変換装
置２の制御回路は、図２に示すように、電力変換装置２
の出力電流Ｉo の有効電流分Ｉorを一定にしたまま出力
電流Ｉo の位相を受電点６の電圧Ｖo の位相に対して進
める。ここで、有効電流分Ｉorは図３の出力電流Ｉo に
等しい。したがって、図２のＩo ＞図３のＩo であり、
図２と図３の電圧Ｖo と電流Ｉo の位相差αが同じなら
ば、本実施例における出力電圧の有効成分は図３の場合
のものよりも大きくなる。
【０００８】また、図２において、送電線インピーダン
スが抵抗分Ｒ１とリアクタンス分Ｘ１の和で表され、電
力変換装置の出力電流がすべて系統電源３へ流れて電圧
降下ｄＶがもっとも高くなる条件の場合（負荷５のイン
ピーダンスが高く、負荷５へ流れる電流が殆どなく負荷
５の影響が無視できる場合）、受電点６の電圧Ｖo は、
【０００９】
【数１】
の式で表わされ、有効電流分Ｉorを一定としても位相差
αを増加させれば電圧Ｖ o を減少させることができ、従
来方式よりも電力系統３へ送電する有効電力を減少させ
ずに受電点の電圧Ｖo の上昇を抑制することができる。
【００１０】
【発明の効果】以上説明したように、本発明は、有効電
流を一定にしたまま進相無効電流を流すことで、電力系
統に送電する電力を減少させずに受電点の電圧上昇を抑
制できるため、太陽電池の発電電力を有効に利用できる
効果がある。DETAILED DESCRIPTION OF THE INVENTION
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention
Solar power that converts AC power to AC power and sends it to the power grid
The present invention relates to an automatic voltage adjustment method for a power conversion device.
[0002]
2. Description of the Related Art This type of photovoltaic power converter is
And the power converter transmits power to the power grid
At the receiving point where the power converter and the power system are connected
Depends on the transmission line impedance of the power system.
Rises compared to the case where it is not performed. Receive power from pole transformer
If the point is far and the impedance of the transmission line is large,
If the transmission power is large enough to exceed the capacity of the transmission line,
The voltage of the electric point exceeds the voltage tolerance of the load connected to it.
And may adversely affect the load. Conventionally,
To suppress the voltage rise of the
Reduce the output of the converter or reduce the output power of the power converter.
How to advance the phase of the current beyond the phase of the receiving point voltage (no advance
Active power control).
FIG. 3 shows a conventional self-advanced reactive power control.
It is a vector diagram explaining a dynamic-voltage adjustment method. From sunlight
Power converters usually have a power factor of 1 with the receiving point voltage.
To output current. Transmission lines here for simplicity
Assuming that the impedance of is a pure resistance,
The vector diagram shows the current I as shown in FIG.o And transmission line voltage drop
The phase of dV matches, and the receiving point voltage Vo The absolute value of Vo 1
(= | Vo |), If the voltage of the power system is V1,o
1 = | V1 | + | dV |. Also, as shown in FIG.
Output current I of force convertero Is the receiving point voltage Vo To
Receiving point voltage V when advanced (the phase difference is α)o
The absolute value of Vo 2 (= | Vo |), | V1 |
| DV | is equal to that of unity power factor, but as shown in FIG.
Since V1 and dV are angled,o 2 <Vo One
The receiving point voltage Vo Voltage rise can be suppressed
You. When transmission line impedance is not pure resistance (Fig. 3)
But basically, the receiving point voltage Vo Suppression of
Control is possible. However, this conventional advanced phase reactive power control
Now, by increasing the current, the output from the inverter
Effective current to be transmitted to the power grid
P1 = | V before advanceo │ × │I o | To P2 = | Vo |
× ｜ Io │ × cos α
The problem is that power cannot be sent to the grid effectively
there were.
An object of the present invention is to suppress a voltage rise at a power receiving point.
And effectively use the power generated by the solar cells in the power grid.
Automatic voltage adjustment of photovoltaic power converters that can transmit power
It is to provide a method.
[0005]
[MEANS FOR SOLVING THE PROBLEMS] To solve the above problems.
Automatic voltage regulation of the power converter for photovoltaic power generation of the present invention
The method includes determining the power receiving point at which the power converter and the power system are connected.
The voltage rise is maintained by keeping the effective current output of the power converter constant.
While suppressing the leading phase reactive current.
Features.
[0006]
[Effect] Leading reactive current is passed while keeping the effective current constant
Power receiving point without reducing the power transmitted to the power grid.
Voltage rise of the solar cell can be suppressed,
It can be used effectively.
[0007]
BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Will be explained. Figure 1 shows the power converter for photovoltaic power generation and the power system
Connection diagram, Fig. 2 is a vector showing the phase of voltage and current
FIG. The power converter 2 exchanges the power generated by the solar cell 1.
Power to the power system 3 via the transmission line 4
You. A load 5 is connected to the transmission line 4. Power conversion equipment
As shown in FIG. 2, the control circuit of the power converter 2
Output current Io Effective current I oforOutput with constant
Current Io Is the voltage V of the receiving point 6.o With respect to the phase of
I will. Here, the effective current IorIs the output current I of FIG.o To
equal. Therefore, I in FIG.o > I in FIG.o And
The voltage V in FIGS. 2 and 3o And current Io If the phase difference α of
For example, the effective component of the output voltage in this embodiment is the case of FIG.
Larger than the ones.
In FIG. 2, the transmission line impedance
Is expressed as the sum of the resistance R1 and the reactance X1.
All the output current of the force converter flows to the system power supply 3 and the voltage
Under the condition where the dV drop is the highest (the load 5
Load with high impedance and little current flowing to load 5
5 is negligible), the voltage V at the receiving point 6o Is
[0009]
(Equation 1)
The effective current IorPhase difference even if
If α is increased, the voltage V o Can be reduced,
The active power to be transmitted to the power system 3
Without receiving point voltage Vo Can be suppressed.
[0010]
As described above, the present invention provides an effective
By supplying a leading reactive current while keeping the current constant,
Voltage rise at the receiving point without reducing the power transmitted to
Power can be effectively used
effective.
【図面の簡単な説明】
【図１】太陽光発電用電力変換装置と電力系統の接続図
である。
【図２】本発明の太陽光発電用電力変換装置の自動電圧
調整方法を示す電圧と電流の位相を示すベクトル図であ
る。
【図３】従来の自動電圧調整方法を示す電圧と電流の位
相を示すベクトル図である。
【図４】送電線インピーダンスと負荷が純抵抗の場合で
送電電流が力率１の場合の電圧と電流の位相を示すベク
トル図である。
【図５】送電線インピーダンスと負荷が純抵抗の場合の
従来の自動電圧調整法を示すベクトル図である。
【符号の説明】
１ 太陽電池
２ 電力変換装置
３ 系統電源
４ 送電線
５ 負荷
６ 受電点BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a connection diagram of a power converter for photovoltaic power generation and a power system. FIG. 2 is a vector diagram showing phases of voltage and current showing an automatic voltage adjustment method of the power converter for photovoltaic power generation of the present invention. FIG. 3 is a vector diagram showing phases of a voltage and a current showing a conventional automatic voltage adjustment method. FIG. 4 is a vector diagram showing phases of a voltage and a current when a transmission line has a power factor of 1 when a transmission line impedance and a load are pure resistance. FIG. 5 is a vector diagram showing a conventional automatic voltage adjustment method when a transmission line impedance and a load are pure resistance. [Description of Signs] 1 Solar cell 2 Power converter 3 System power supply 4 Transmission line 5 Load 6 Power receiving point
───────────────────────────────────────────────────── フロントページの続き (72)発明者 久米 常生 福岡県北九州市八幡西区黒崎城石２番１ 号 株式会社安川電機内 (56)参考文献 特開 昭59−181928（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H02J 3/00 - 5/00 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Tsuneo Kume 2-1, Kurosaki Shiroishi, Yawatanishi-ku, Kitakyushu-city, Fukuoka Prefecture Inside Yaskawa Electric Co., Ltd. (56) References JP-A-59-181928 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) H02J 3/00-5/00
Claims (1)
し、前記交流電力を電力系統へ送電する太陽光発電用電
力変換装置の自動電圧調整方法において、前記電力変換
装置と前記電力系統が接続される受電点の電圧上昇を、
前記電力変換装置の有効電流出力を一定に保ちながら進
相無効電流を流すことによって抑制することを特徴とす
る、太陽光発電用電力変換装置の自動電圧調整方法。(1) An automatic voltage adjustment method for a power conversion device for photovoltaic power generation, wherein the power generated by a solar cell is converted into AC power and the AC power is transmitted to a power system. A voltage rise at a power receiving point where the power converter and the power system are connected,
An automatic voltage adjustment method for a power converter for photovoltaic power generation, characterized in that the power converter is suppressed by flowing a leading-phase reactive current while keeping the effective current output of the power converter constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11857295A JP3528879B2 (en) | 1995-05-17 | 1995-05-17 | Automatic voltage adjustment method for photovoltaic power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11857295A JP3528879B2 (en) | 1995-05-17 | 1995-05-17 | Automatic voltage adjustment method for photovoltaic power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08317563A JPH08317563A (en) | 1996-11-29 |
| JP3528879B2 true JP3528879B2 (en) | 2004-05-24 |
Family
ID=14739924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11857295A Expired - Fee Related JP3528879B2 (en) | 1995-05-17 | 1995-05-17 | Automatic voltage adjustment method for photovoltaic power converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3528879B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012169013A1 (en) | 2011-06-07 | 2012-12-13 | 東芝三菱電機産業システム株式会社 | Operation control device for photovoltaic power generation system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482674B (en) * | 2017-07-25 | 2020-06-05 | 中国科学院电工研究所 | Grid-connected point voltage rise suppression method for distributed power generation system |
-
1995
- 1995-05-17 JP JP11857295A patent/JP3528879B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012169013A1 (en) | 2011-06-07 | 2012-12-13 | 東芝三菱電機産業システム株式会社 | Operation control device for photovoltaic power generation system |
| US10033189B2 (en) | 2011-06-07 | 2018-07-24 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Operation control apparatus for solar power system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08317563A (en) | 1996-11-29 |
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