JPS638715B2 - - Google Patents
Info
- Publication number
- JPS638715B2 JPS638715B2 JP55115724A JP11572480A JPS638715B2 JP S638715 B2 JPS638715 B2 JP S638715B2 JP 55115724 A JP55115724 A JP 55115724A JP 11572480 A JP11572480 A JP 11572480A JP S638715 B2 JPS638715 B2 JP S638715B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- inverter
- power
- grid
- frequency
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Inverter Devices (AREA)
Description
【発明の詳細な説明】
本発明は、直流電源からインバータを介して交
流電源系統に電力を送り込む、例えば太陽電池発
電システムの如き電力供給装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device, such as a solar cell power generation system, which sends power from a DC power source to an AC power system via an inverter.
従来、発電機以外のこの種の電力供給装置と配
電系統とを切換え方式でなくて連系で接続するこ
とはほとんど皆無であつたため、実用化する上で
検討を要するいくつかの問題点がある。これらの
問題点の1つとして系統停電時における安全性に
関する問題がある。すなわち、系統停電が生じた
だけではインバータが運転を停止するとは限らな
いため、インバータが運転を停止しないときには
系統に接続された機器に異常な電圧を与える恐れ
があり、また線路の補修時に充電部に触れる危険
性がある。 Conventionally, this type of power supply equipment other than generators has almost never been connected to the power distribution system by interconnection rather than switching, so there are several issues that need to be considered before it can be put into practical use. . One of these problems is safety during a power outage. In other words, a grid power outage does not necessarily mean that the inverter will stop operating, so if the inverter does not stop operating, there is a risk of applying abnormal voltage to equipment connected to the grid. There is a risk of coming into contact with.
通常の発電機の場合には、発電機は専用線にて
変電所に結びつけられているので、系統事故時等
には切離し指令で配電系統からの切り離しが可能
であるが、太陽電池発電システムの場合にはかか
る専用線による変電所との接続を行うほどの規模
でなく、もつた小規模なシステムの普及が好まし
いので、上記のごとく系統からの停止指令を受け
ることは困難である。 In the case of a normal generator, the generator is connected to a substation with a dedicated line, so in the event of a system failure, it can be disconnected from the distribution system by issuing a disconnection command, but in the case of a solar power generation system. In such cases, it is preferable to disseminate small-scale systems that are not large enough to connect to substations using such dedicated lines, so it is difficult to receive a shutdown command from the grid as described above.
本発明の目的は、配電系統の停電を検知してイ
ンバータの出力電圧を遮断する自動停止機能を備
えた冒頭に述べた如き電力供給装置を提供するこ
とにある。 An object of the present invention is to provide a power supply device as described at the beginning, which is equipped with an automatic stop function that detects a power outage in the power distribution system and cuts off the output voltage of the inverter.
この目的は、本発明によれば、直流電源からイ
ンバータを介して交流電源系統に電力を送り込む
電力供給装置において、交流電源系統側から検出
される系統電圧瞬時値から導き出された制御信号
にしたがつてインバータ出力電圧、周波数および
位相を制御する制御手段と、系統電圧および系統
周波数を監視し、少なくとも系統電圧が系統周波
数かのいずれか一方が予め定められた範囲からは
ずれたことを検出して出力信号を発生する検出手
段と、該検出手段が発生した出力信号を記憶し、
その記憶のリセツトを指令する信号が与えられる
までの間、前記制御手段に対してインバータのパ
ルスオフを指令する記憶手段と、を備えているこ
とにより達成される。 According to the present invention, in a power supply device that sends power from a DC power source to an AC power system via an inverter, a control signal derived from an instantaneous value of system voltage detected from the AC power system side is used. A control means for controlling the inverter output voltage, frequency and phase, and a control means for monitoring the grid voltage and grid frequency, detecting that at least one of the grid voltage and the grid frequency deviates from a predetermined range and outputting the output. a detection means for generating a signal; and storing an output signal generated by the detection means;
This is achieved by comprising a memory means that instructs the control means to turn off the pulse of the inverter until a signal instructing to reset the memory is given.
かかる本発明構成によれば、インバータは系統
電圧とは独立して自ら安定な電圧、周波数を維持
する機能を持たないで、系統停電時には系統電圧
および周波数を定格値付近に維持するほど安定な
運転を持続できず、したがつて系統電圧か系統周
波数かのいずれか一方が予め定めた範囲をはずれ
ることになり、確実な停電検出が行なわれてこれ
が記憶されることになる。このようにして得られ
た停止信号によりインバータ出力電圧の遮断が行
なわれる。このインバータ出力電圧の遮断は、制
御装置からインバータ内変換弁への制御パルスを
オフすることによつて、あるいはインバータ出力
部に設けた開閉手段をトリツプすることによつ
て、またはそれらの両方によつて行なうことがで
きる。 According to the configuration of the present invention, the inverter does not have the function of maintaining stable voltage and frequency by itself independently of the grid voltage, but can operate stably enough to maintain the grid voltage and frequency near the rated values in the event of a grid power outage. cannot be sustained, and therefore either the grid voltage or the grid frequency will be out of the predetermined range, and reliable power outage detection will be performed and this will be stored. The inverter output voltage is cut off by the stop signal thus obtained. This inverter output voltage can be shut off by turning off the control pulse from the control device to the inverter conversion valve, by tripping the switching means provided at the inverter output, or by both. It can be done with
以下、図面を参照しながら本発明の実施例につ
いて詳細に説明する。 Embodiments of the present invention will be described in detail below with reference to the drawings.
図において、1は例えば太陽電池を直流電源と
してこれの直流電力を交流電力に変換して交流電
源系統、とくに配電系統2に送り込む自励インバ
ータである。このインバータとして、例えばパワ
ートランジスタからなる電圧形パルス幅変調イン
バータとこれの出力部に設けられたLCフイルタ
とから構成されている公知のものを使用すること
ができる。系統2に接続されて給電を受ける負荷
機器は3によつて代表的に示されている。インバ
ータ1のための制御装置は4で示されており、こ
の制御装置は例えば正弦波形の制御信号と高周波
の三角波信号との切り合いに基づいてインバータ
弁にパルス分配を行なうことによりパルス幅変調
制御を行なうものである。その場合に、制御装置
4は前述の制御信号を信号用変圧器5を介して検
出される系統電圧から導き出す。例えば制御装置
4は変圧器5からの第1の信号電圧とこれを90゜
だけ移相した第2の信号電圧とを可変比率で合成
することによりそのような制御信号をつくり出
す。この制御信号の周波数および位相に一致した
周波数および位相の基本波分を持つパルス幅変調
された出力電圧がインバータから発生する。その
出力電圧に含まれる高調波成分はインバータ出力
部のフイルタにより吸収される。 In the figure, reference numeral 1 denotes a self-excited inverter that uses, for example, a solar cell as a DC power source, converts the DC power into AC power, and sends the AC power to an AC power system, particularly a power distribution system 2. As this inverter, for example, a known inverter consisting of a voltage-type pulse width modulation inverter made of power transistors and an LC filter provided at the output section of the inverter can be used. A load device connected to the system 2 and receiving power supply is representatively indicated by 3. A control device for the inverter 1 is indicated by 4, and this control device performs pulse width modulation control by distributing pulses to the inverter valve based on the balance between a sinusoidal waveform control signal and a high-frequency triangular wave signal, for example. This is what we do. In that case, control device 4 derives the aforementioned control signals from the system voltage detected via signal transformer 5 . For example, the control device 4 generates such a control signal by combining a first signal voltage from the transformer 5 and a second signal voltage phase-shifted by 90° at a variable ratio. A pulse width modulated output voltage having a fundamental wave component with a frequency and phase matching the frequency and phase of this control signal is generated from the inverter. The harmonic components contained in the output voltage are absorbed by the filter at the inverter output section.
合成時に第1の信号電圧に与えられる係数は第
2の信号電圧に与えられる係数が零設定のときに
フイルタ入力側電圧とフイルタ出力側電圧とが平
衡するように調整するならば、インバータ出力は
ほとんど第2の信号電圧に与える係数のみに依存
して変化し、系統電圧の種々の変動に良好に追従
してインバータの高力率運転を維持することがで
きる。 If the coefficient given to the first signal voltage during synthesis is adjusted so that the filter input side voltage and the filter output side voltage are balanced when the coefficient given to the second signal voltage is set to zero, the inverter output is It changes depending almost only on the coefficient given to the second signal voltage, and can follow various fluctuations in the system voltage well to maintain high power factor operation of the inverter.
このように系統電圧からインバータ制御信号を
導き出すことにより得られる系統変動に対する追
従性の良さは、後述の系統電圧および周波数の監
視による系統停電検出の確実性をもたらす。 The ability to follow grid fluctuations obtained by deriving the inverter control signal from the grid voltage in this way provides reliability in detecting grid power outages by monitoring grid voltage and frequency, which will be described later.
系統停電検出のために、信号用変圧器6を介し
て取り出されフイルタ7によりノイズを除去され
た系統電圧が周波数低下検出器8、周波数上昇検
出器9、電圧低下検出器10および電圧上昇検出
器11に導かれる。これらの検出器の出力端は、
オアゲート12を介してフリツプフロツプ13の
セツト入力端に結ばれている。したがつて系統電
圧の大きさおよび周波数のいずれか一方がそれぞ
れの定格値から予め定められた許容値を越えては
ずれたときフリツプフロツプ13がセツトされ
る。このときにフリツプフロツプ13が発する出
力信号はパルスオフ指令として制御装置4に導か
れ、インバータ1が停止される。フリツプフロツ
プ13の出力信号は、インバータ出力部の図示さ
れていない遮断器のトリツプ信号として使用する
こともできる。フリツプフロツプ13のリセツト
信号Aが復電確認後の再始動指令にしたがつて与
えられたとき、インバータ1が再び始動される。 In order to detect a grid power outage, the grid voltage is taken out via the signal transformer 6 and noise is removed by the filter 7, and the grid voltage is sent to a frequency drop detector 8, a frequency rise detector 9, a voltage drop detector 10, and a voltage rise detector. I am led to 11. The output ends of these detectors are
It is connected to the set input of flip-flop 13 via OR gate 12. Therefore, flip-flop 13 is set when either the magnitude or frequency of the grid voltage deviates from their respective rated values by more than a predetermined tolerance. At this time, the output signal generated by the flip-flop 13 is sent to the control device 4 as a pulse-off command, and the inverter 1 is stopped. The output signal of flip-flop 13 can also be used as a trip signal for a circuit breaker (not shown) at the inverter output. When the reset signal A of the flip-flop 13 is given in accordance with the restart command after power restoration is confirmed, the inverter 1 is started again.
本発明によれば、系統停電時にインバータ1は
安定な出力電圧を維持することなく定格値付近か
らの電圧偏差か周波数偏差を生じることから、電
圧および周波数の監視により確実に停電を検出し
て自動的に停止することができるので、系統停電
時に、系統に接続されている負荷機器に異常電圧
をもたすようなことがなくなり、線路補修時に充
電部に触れる危険性をなくすことができる。ま
た、かゝる自動停止はインバータ自身の保護にも
役立つ。 According to the present invention, when a power outage occurs in the grid, the inverter 1 does not maintain a stable output voltage and generates a voltage deviation or frequency deviation from around the rated value, so by monitoring the voltage and frequency, the power outage is reliably detected and automatically Since the system can be stopped automatically, there will be no abnormal voltage applied to load equipment connected to the system during a power outage, and the risk of touching live parts during line repair can be eliminated. In addition, such automatic stop is useful for protecting the inverter itself.
図は本発明実施例を示すブロツクである。
1……太陽電池を直流電源とするインバータ、
2……系統、3……負荷機器、4……制御装置、
7……ノイズ吸収フイルタ、8……周波数低下検
出器、9……周波数上昇検出器、10……電圧低
下検出器、11……電圧上昇検出器、13……フ
リツプフロツプ。
The figure is a block diagram showing an embodiment of the present invention. 1...Inverter that uses solar cells as a DC power source,
2...System, 3...Load equipment, 4...Control device,
7...Noise absorption filter, 8...Frequency drop detector, 9...Frequency rise detector, 10...Voltage drop detector, 11...Voltage rise detector, 13...Flip-flop.
Claims (1)
統に電力を送り込む電力供給装置において、 交流電源系統側から検出される系統電圧瞬時値
から導き出された制御信号にしたがつてインバー
タ出力電圧、周波数および位相を制御する制御手
段と、 系統電圧および系統周波数を監視し、少なくと
も系統電圧か系統周波数かのいずれか一方が予め
定められた範囲からはずれたことを検出して出力
信号を発生する検出手段と、 該検出手段が発生した出力信号を記憶し、その
記憶のリセツトを指令する信号が与えられるまで
の間、前記制御手段に対してインバータのパルス
オフを指令する記憶手段と、 を備えていることを特徴とする電力供給装置。[Claims] 1. In a power supply device that sends power from a DC power source to an AC power system via an inverter, the inverter outputs in accordance with a control signal derived from an instantaneous value of system voltage detected from the AC power system side. A control means for controlling the voltage, frequency and phase; and a control means for monitoring the grid voltage and the grid frequency and generating an output signal when at least one of the grid voltage or the grid frequency deviates from a predetermined range. and a storage means for storing the output signal generated by the detection means and for instructing the control means to turn off the pulse of the inverter until a signal instructing to reset the memory is given. A power supply device characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55115724A JPS5740373A (en) | 1980-08-22 | 1980-08-22 | Power supply system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55115724A JPS5740373A (en) | 1980-08-22 | 1980-08-22 | Power supply system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5740373A JPS5740373A (en) | 1982-03-05 |
JPS638715B2 true JPS638715B2 (en) | 1988-02-24 |
Family
ID=14669542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55115724A Granted JPS5740373A (en) | 1980-08-22 | 1980-08-22 | Power supply system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5740373A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108808695A (en) * | 2018-06-27 | 2018-11-13 | 南京申宁达智能科技有限公司 | A kind of three phase static reactive compensation system and its control method |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4626952A (en) * | 1984-08-27 | 1986-12-02 | Mitsubishi Denki Kabushiki Kaisha | Protection apparatus for a transistor inverter |
JPS6231335A (en) * | 1985-08-01 | 1987-02-10 | 三洋電機株式会社 | Solar power generator |
JPS6289429A (en) * | 1985-10-11 | 1987-04-23 | 三洋電機株式会社 | Power failure detecting method |
JPS6295933A (en) * | 1985-10-19 | 1987-05-02 | 三洋電機株式会社 | Service interruption detector |
JP2548913B2 (en) * | 1985-10-30 | 1996-10-30 | 京セラ株式会社 | Pump device |
JP2608399B2 (en) * | 1985-10-30 | 1997-05-07 | 京セラ株式会社 | Pump device |
JP5854609B2 (en) * | 2011-02-09 | 2016-02-09 | 株式会社日立産機システム | Converter device and control method thereof |
WO2018020666A1 (en) * | 2016-07-29 | 2018-02-01 | 東芝三菱電機産業システム株式会社 | Power conversion device and control method therefor |
-
1980
- 1980-08-22 JP JP55115724A patent/JPS5740373A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108808695A (en) * | 2018-06-27 | 2018-11-13 | 南京申宁达智能科技有限公司 | A kind of three phase static reactive compensation system and its control method |
CN108808695B (en) * | 2018-06-27 | 2021-08-06 | 南京申宁达智能科技有限公司 | Three-phase static reactive power compensation system and control method thereof |
Also Published As
Publication number | Publication date |
---|---|
JPS5740373A (en) | 1982-03-05 |
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