JP3721756B2 - Control method for line interactive power supply - Google Patents
Control method for line interactive power supply Download PDFInfo
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- JP3721756B2 JP3721756B2 JP35598097A JP35598097A JP3721756B2 JP 3721756 B2 JP3721756 B2 JP 3721756B2 JP 35598097 A JP35598097 A JP 35598097A JP 35598097 A JP35598097 A JP 35598097A JP 3721756 B2 JP3721756 B2 JP 3721756B2
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- inverter
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- power supply
- current
- storage battery
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- 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
- Y02E40/40—Arrangements for reducing harmonics
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- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Description
【０００１】
【発明の属する技術分野】
この発明は、電力系統とインバータを連系し、通常時は蓄電池を充電すると共に負荷に電力を供給すると同時に高調波電流を抑制し、停電時は上記連系を解列し、インバータから負荷へ電流を供給する方式の無停電電源装置である、ラインインタラクティブ方式電源の制御方法に関するものである。
【０００２】
【従来の技術】
図１にラインインタラクティブ方式電源の代表的な構成を示す。図中、１は電力系統、２は負荷、３はインバータ、ＳＷは停電時電力系統１とインバータの連系を解列する高速スイッチ、Ｆはインバータ出力高調波抑制用フィルタ、Ｂはインバータの直流側に接続されている蓄電池である。
【０００３】
このラインインタラクティブ方式電源は、通常時は高速スイッチＳＷを閉じて電力系統１とインバータ３を連系し、蓄電池Ｂを充電すると共に、負荷電流を検出してインバータ３を制御して負荷の高調波電流を抑制する。電力系統１が停電などの異常時には高速スイッチＳＷを開いて電力系統を解列し、蓄電池Ｂからインバータ３を介して負荷に電力供給する。
【０００４】
【発明が解決しようとする課題】
図３に示すように、負荷２側に直列リアクトルを持たない力率改善用コンデンサＣを持つ場合、電力系統のインピーダンスはほぼインダクタンス分と見なせる。そのためインバータが負荷の高調波電流抑制を行うと、出力高調波電流ｉＲが負荷に流入するため、これを再度検出し、それに対して制御を行う正帰還が形成され、電流が発振状態となる。
【０００５】
このとき、異常電流が流れるため、負荷２側の力率改善用コンデンサＣを焼損したり、負荷やインバータに異常を来したりするおそれがある。そのため従来は、負荷側を調査し、異常の原因となるコンデンサに直列にリアクトルを挿入する必要があった。
【０００６】
この発明は、このような課題を鑑みてなされたものであり、その目的とするところは、負荷側に直列リアクトルを持たない力率改善用コンデンサがある場合でも負荷の焼損や装置の異常を自動的に防止することができるラインインタラクティブ方式電源の制御方法を提供することにある。
【０００７】
この発明、商用電源と負荷間にインバータと蓄電池の直列回路を接続し、商用電源の正常時には商用電源より負荷に電力を供給するとともに、インバータを介して蓄電池を充電しながら負荷で発生する高調波電流を打消ように高調波電流をインバータより供給し、商用電源の停電時にはインバータ及び負荷を商用電源から解列し、前記蓄電池よりインバータを介して電力供給するラインインタラクティブ方式電源の制御方法において、
商用電源の正常時に前記インバータのキャリア周波数近傍の周波数の負荷電流を監視し、この監視信号とあらかじめ設定される設定値とを比較して、負荷側のコンデンサにより正帰還が生じ異常電流が発生したことを自動的に判定する判定手順と、前記判定手順の判定信号で前記インバータの高調波抑制機能のみを停止させる停止手順を有し、前記正帰還による異常を自動的に防止することを特徴とする。
【０００８】
【発明の実施の形態】
図２に、ラインインタラクティブ方式電源（図１）の負荷側コンデンサなどにより正帰還が生じ異常電流が発生したことを検出する異常負荷電流検出回路を示す。図２において、１１はＣＴで検出した負荷電流からインバータ３（図１，図３）のキャリア周波数近傍の高周波成分を抽出するバンドパスフィルタ、１２は抽出した負荷電流の高周波成分を整流する整流回路、１３は整流された負荷電流の高周波成分を設定値と比較して設定を超えた場合異常電流発生と判定するコンパレータである。
【０００９】
負荷側に力率改善用コンデンサなどがある場合にはインバータ３が高調波抑制を行うと、異常発振を惹起し、負荷側にインバータのキャリア周波数に近い周波数の電流が大量に流れる。上記異常電流検出回路は、このインバータのキャリア周波数に近い周波数の負荷電流が大量に流れたことを検出し異常電流発生と判定する。
【００１０】
したがって、上記異常発振検出信号によりインバータの高調波抑制機能のみを停止させ、負荷への電力はそのまま供給し続けることにより、負荷側に直列リアクトルを持たない力率改善用コンデンサＣがある場合（図３）でも負荷の焼損や装置の異常となるのを自動的に防止することができる。
【００１１】
【発明の効果】
この発明によれば、電力系統とインバータを連系し、通常時は蓄電池を充電すると共に負荷の高調波電流を抑制し、停電時は系統と負荷を解列し、蓄電池からインバータを介して負荷へ電力を供給する方式の無停電電源装置であるラインインタラクティブ方式電源を適用する場合に、負荷側に直列リアクトルを持たない力率改善用コンデンサがある場合でも負荷の焼損や装置の異常を自動的に防止することができる。
【図面の簡単な説明】
【図１】ラインインタラクティブ方式電源の構成説明図。
【図２】実施の形態にかかる異常発振検出回路構成図。
【図３】負荷にコンデンサがある場合の高調波電流説明図。
【符号の説明】
１…電力系統
２…負荷
３…ラインインタラクティブ方式電源のインバータ
Ｂ…ラインインタラクティブ方式電池の蓄電池
Ｆ…キャリア周波数除去用フィルタ
ＳＷ…連系解列用高速スイッチ
１１…キャリア周波数近傍検出用バンドパスフィルタ
１２…整流回路
１３…コンパレータ。[0001]
BACKGROUND OF THE INVENTION
This invention links the power system and the inverter, charges the storage battery during normal operation and supplies power to the load and simultaneously suppresses harmonic currents, and disconnects the interconnection from the inverter to the load during a power failure. The present invention relates to a method for controlling a line interactive power supply, which is an uninterruptible power supply apparatus that supplies current.
[0002]
[Prior art]
FIG. 1 shows a typical configuration of a line interactive power supply. In the figure, 1 is a power system, 2 is a load, 3 is an inverter, SW is a high-speed switch that disconnects the connection between the power system 1 and the inverter during a power failure, F is a filter for suppressing inverter output harmonics, and B is a DC of the inverter It is a storage battery connected to the side.
[0003]
This line interactive power supply normally closes the high-speed switch SW to link the power system 1 and the
[0004]
[Problems to be solved by the invention]
As shown in FIG. 3, when the power factor improving capacitor C having no series reactor is provided on the
[0005]
At this time, since an abnormal current flows, there is a risk of burning the power factor improving capacitor C on the
[0006]
The present invention has been made in view of such problems, and the object of the present invention is to automatically detect burnout of a load and abnormality of a device even when there is a power factor improving capacitor that does not have a series reactor on the load side. It is an object of the present invention to provide a method for controlling a line interactive power supply that can be prevented in an effective manner.
[0007]
In this invention, a series circuit of an inverter and a storage battery is connected between the commercial power supply and the load, and when the commercial power supply is normal, power is supplied from the commercial power supply to the load, and harmonics generated at the load while charging the storage battery via the inverter In the control method of the line interactive power supply that supplies harmonic current from the inverter so as to cancel the current, disconnects the inverter and the load from the commercial power supply during a power failure of the commercial power supply, and supplies power from the storage battery via the inverter.
Monitoring the load current of the frequency of the carrier frequency near the inverter during normal utility power is compared with the set value in advance is set as the monitoring signal, the abnormal current more positive feedback occurs on the load side of the capacitor is It has a determination procedure for automatically determining that it has occurred, and a stop procedure for stopping only the harmonic suppression function of the inverter with a determination signal of the determination procedure , and automatically preventing abnormalities due to the positive feedback. Features.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 2 shows an abnormal load current detection circuit that detects that an abnormal current is generated due to positive feedback caused by a load-side capacitor or the like of the line interactive power supply (FIG. 1). In FIG. 2, 11 is a band-pass filter that extracts a high-frequency component near the carrier frequency of the inverter 3 (FIGS. 1 and 3) from the load current detected by CT, and 12 is a rectifier circuit that rectifies the high-frequency component of the extracted load current. , 13 is a comparator that compares the set high-frequency component of the rectified load current with a set value and determines that an abnormal current has occurred when the set value is exceeded.
[0009]
If there is a power factor improving capacitor on the load side and the
[0010]
Therefore, when only the harmonic suppression function of the inverter is stopped by the abnormal oscillation detection signal and the power to the load is continuously supplied, there is a power factor improving capacitor C that does not have a series reactor on the load side (see FIG. 3) However, it is possible to automatically prevent the load from being burned out and the apparatus from becoming abnormal.
[0011]
【The invention's effect】
According to the present invention, the power system and the inverter are linked, the storage battery is charged during normal time and the harmonic current of the load is suppressed, the system and the load are disconnected during a power failure, and the load is connected from the storage battery via the inverter. When a line interactive power supply, which is an uninterruptible power supply system that supplies power to the power supply, is applied, even if there is a power factor correction capacitor that does not have a series reactor on the load side, load burnout and equipment abnormalities are automatically detected. Can be prevented.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of a line interactive power supply.
FIG. 2 is a configuration diagram of an abnormal oscillation detection circuit according to the embodiment.
FIG. 3 is an explanatory diagram of harmonic current when a capacitor is present in the load.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ...
Claims (1)
商用電源の正常時に前記インバータのキャリア周波数近傍の周波数の負荷電流を監視し、この監視信号とあらかじめ設定される設定値とを比較して、負荷側のコンデンサにより正帰還が生じ異常電流が発生したことを自動的に判定する判定手順と、
前記判定手順の判定信号で前記インバータの高調波抑制機能のみを停止させる停止手順を有し、
前記正帰還による異常を自動的に防止することを特徴とするラインインタラクティブ方式電源の制御方法。A series circuit of an inverter and a storage battery is connected between the commercial power supply and the load. When the commercial power supply is normal, power is supplied from the commercial power supply to the load, and the harmonic current generated in the load is canceled while charging the storage battery via the inverter. In the control method of the line interactive system power supply, the harmonic current is supplied from the inverter, the inverter and the load are disconnected from the commercial power supply during a power failure, and the power is supplied from the storage battery via the inverter.
Monitoring the load current of the frequency of the carrier frequency near the inverter during normal utility power is compared with the set value in advance is set as the monitoring signal, the abnormal current more positive feedback occurs on the load side of the capacitor is A determination procedure for automatically determining that it has occurred;
Having a stop procedure for stopping only the harmonic suppression function of the inverter with a determination signal of the determination procedure ,
A control method for a line interactive power supply, wherein abnormality due to the positive feedback is automatically prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35598097A JP3721756B2 (en) | 1997-12-25 | 1997-12-25 | Control method for line interactive power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35598097A JP3721756B2 (en) | 1997-12-25 | 1997-12-25 | Control method for line interactive power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11191928A JPH11191928A (en) | 1999-07-13 |
| JP3721756B2 true JP3721756B2 (en) | 2005-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35598097A Expired - Fee Related JP3721756B2 (en) | 1997-12-25 | 1997-12-25 | Control method for line interactive power supply |
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| JP (1) | JP3721756B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018770B (en) * | 2020-07-30 | 2024-03-01 | 中山大学 | Ultra-wideband rectification circuit based on harmonic feedback and design method |
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- 1997-12-25 JP JP35598097A patent/JP3721756B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| JPH11191928A (en) | 1999-07-13 |
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