JPH09191577A - Self-excited reactive power compensation device - Google Patents
Self-excited reactive power compensation deviceInfo
- Publication number
- JPH09191577A JPH09191577A JP8000924A JP92496A JPH09191577A JP H09191577 A JPH09191577 A JP H09191577A JP 8000924 A JP8000924 A JP 8000924A JP 92496 A JP92496 A JP 92496A JP H09191577 A JPH09191577 A JP H09191577A
- Authority
- JP
- Japan
- Prior art keywords
- charging
- capacity
- transformer
- self
- inverter
- 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.)
- Withdrawn
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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は電力系統の電圧変
動の抑制やフリッカ対策などに使用される自励式無効電
力補償装置に関し、特に容量の異なる複数のインバータ
を連系用の変圧器を介して系統母線に接続した自励式無
効電力補償装置における直流電源回路の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-excited reactive power compensator used for suppressing voltage fluctuations in a power system and as a countermeasure against flicker. The present invention relates to improvement of a DC power supply circuit in a self-excited var compensator connected to a system bus.
【０００２】[0002]
【従来の技術】一般に自励式無効電力補償装置は、電力
系統の電圧変動の抑制やフリッカ対策などに使用されて
いる。基本的には１台のインバータの出力電流を制御し
て電力系統の無効電力の補償が行なわれているが、イン
バータの内部損失電力が増大することがある。2. Description of the Related Art Generally, a self-excited reactive power compensator is used to suppress voltage fluctuations in a power system and to prevent flicker. Basically, the output current of one inverter is controlled to compensate the reactive power of the power system, but the internal loss power of the inverter may increase.
【０００３】そこで、インバータの内部損失電力を低減
させるために、容量の異なる複数のインバータを連系用
の変圧器を介して電力系統に接続した自励式無効電力補
償装置（以下、自励式ＳＶＣという）が提案されてい
る。Therefore, in order to reduce the internal loss power of the inverter, a self-excited reactive power compensator (hereinafter referred to as self-excited SVC) in which a plurality of inverters having different capacities are connected to a power system through a transformer for interconnection. ) Is proposed.
【０００４】この自励式ＳＶＣは、例えば図２に示すよ
うに構成されており、系統電源１と変動負荷（図示せ
ず）との間の系統母線に連系用の遮断器２を介して設置
されている。この自励式ＳＶＣ３には補機電源４が接続
されている。この自励式ＳＶＣ３は、例えば方形波用の
充電スイッチ５ａ，方形波用の充電変圧器５ｂ，方形波
用の整流器５ｃを含む第１の充電回路５と、ＰＷＭ用の
充電スイッチ６ａ，ＰＷＭ用の充電変圧器６ｂ，ＰＷＭ
用の整流器６ｃを含む第２の充電回路６と、第１の充電
回路５の出力側に接続された第１の直流コンデンサ７
と、第２の充電回路６の出力側に接続された第２の直流
コンデンサ８と、第１の直流コンデンサ７を直流電源と
する大容量インバータ９と、第２の直流コンデンサ８を
直流電源とする小容量インバータ１０と、系統母線に直
列接続され、かつ大容量インバータ９及び小容量インバ
ータ１０の出力側に接続された第１，第２の変圧器１
１，１２とから構成されている。尚、大容量インバータ
９及び小容量インバータ１０におけるスイッチング素子
としては、ＧＴＯ（ゲートターンオフサイリスタ）半導
体素子が用いられる。This self-excited SVC is constructed, for example, as shown in FIG. 2, and is installed on a system bus between a system power supply 1 and a variable load (not shown) via a circuit breaker 2 for interconnection. Has been done. An auxiliary power source 4 is connected to the self-excited SVC 3. This self-excited SVC 3 includes, for example, a first charging circuit 5 including a charging switch 5a for square wave, a charging transformer 5b for square wave, and a rectifier 5c for square wave, a charging switch 6a for PWM, and a charging switch 6a for PWM. Charge transformer 6b, PWM
Second charging circuit 6 including a rectifier 6c for use with a first DC capacitor 7 connected to the output side of the first charging circuit 5
A second DC capacitor 8 connected to the output side of the second charging circuit 6, a large-capacity inverter 9 using the first DC capacitor 7 as a DC power source, and a second DC capacitor 8 as a DC power source. Small-capacity inverter 10 and a first and second transformer 1 connected in series to the system bus and connected to the output sides of the large-capacity inverter 9 and the small-capacity inverter 10.
It is composed of 1 and 12. A GTO (gate turn-off thyristor) semiconductor element is used as a switching element in the large capacity inverter 9 and the small capacity inverter 10.
【０００５】上述の大容量インバータ９は、第１の直流
コンデンサ７の直流電圧Ｅ1 を交流に変換して第１の変
圧器１１の一次側に、系統母線の系統電圧と同等のイン
バータ電圧（補償電圧）を発生させるように制御され
る、例えば大容量低速スイッチング矩形波（方形波）イ
ンバータである。一方、小容量インバータ１０は、第２
の直流コンデンサ８の直流電圧Ｅ2 を交流に変換して第
２の変圧器１２の一次側に、系統母線の負荷変動を抑制
する補償電圧を発生させるように制御される、例えば小
容量高速スイッチングＰＷＭインバータである。The large-capacity inverter 9 described above uses the DC voltage E 1 of the first DC capacitor 7. Is converted into an alternating current to generate an inverter voltage (compensation voltage) equivalent to the system voltage of the system bus on the primary side of the first transformer 11, for example, a large-capacity low-speed switching rectangular wave (square wave). ) It is an inverter. On the other hand, the small capacity inverter 10 has a second
DC voltage E 2 of the DC capacitor 8 of Is converted into alternating current and is controlled so as to generate a compensation voltage for suppressing load fluctuation of the system bus on the primary side of the second transformer 12, for example, a small-capacity high-speed switching PWM inverter.
【０００６】この自励式ＳＶＣ３は、次のように動作す
る。まず、連系用の遮断器２の開放状態において、充電
スイッチ５ａ，６ａを閉成すると、第１，第２の充電回
路５，６に低圧（例えば２００Ｖないし４００Ｖ）の補
機電源４が接続され、整流器５ｃ，６ｃにて直流に変換
される。これによって、第１，第２の直流コンデンサ
７，８は直流電圧Ｅ1 ，Ｅ2 に充電され、初期充電が完
了する。この状態において、遮断器２を閉成して系統母
線（系統電源１）に連系すると共に、第１の充電回路５
の充電スイッチ５ａを開放する。系統母線に負荷変動に
伴い無効電力が生ずると、大容量インバータ９及び小容
量インバータ１０から補償電圧を第１，第２の変圧器１
１，１２を介して系統母線に供給することによって無効
電力の補償が行なわれる。具体的にはインバータ電圧の
位相を系統電圧に対して進ませたり（有効電力の流
出），遅らせたり（有効電力の流入）することにより、
有効電力が制御される。The self-excited SVC 3 operates as follows. First, when the charging switches 5a and 6a are closed in the open state of the circuit breaker 2 for interconnection, a low-voltage (for example, 200V to 400V) auxiliary power supply 4 is connected to the first and second charging circuits 5 and 6. And converted to direct current by the rectifiers 5c and 6c. As a result, the first and second DC capacitors 7 and 8 receive the DC voltage E 1 , E 2 Is fully charged and the initial charging is completed. In this state, the circuit breaker 2 is closed to be connected to the system bus (system power supply 1) and the first charging circuit 5
The charging switch 5a is opened. When reactive power is generated in the system bus due to load fluctuation, the compensation voltage is supplied from the large capacity inverter 9 and the small capacity inverter 10 to the first and second transformers 1.
The reactive power is compensated by supplying the power to the system bus via 1, 12. Specifically, the phase of the inverter voltage is advanced (active power outflow) or delayed (active power inflow) with respect to the system voltage,
Active power is controlled.
【０００７】[0007]
【発明が解決しようとする課題】ところで、自励式ＳＶ
Ｃ３の初期充電に必要とする補機電源４の電力容量は、
運転中（系統連系中）に比べて少なくて済むが、運転中
には初期充電の５〜１０倍程度を要する。即ち、運転
中、第１の直流コンデンサ７は系統電源１から補充充電
されるのに対し、第２の直流コンデンサ８は系統連系後
も補機電源４によって補充充電されるためであり、従っ
て、補機電源４は、運転中においては第２の直流コンデ
ンサ８が確実に補充充電され得る程度の電力容量が要求
されることになる。By the way, the self-excited SV
The power capacity of the auxiliary power supply 4 required for the initial charging of C3 is
It is less than that during operation (during system interconnection), but about 5 to 10 times the initial charge is required during operation. That is, during operation, the first DC capacitor 7 is replenished and charged from the system power supply 1, while the second DC capacitor 8 is replenished and charged by the auxiliary power supply 4 even after the system interconnection. Therefore, the auxiliary power supply 4 is required to have a power capacity enough to reliably replenish and charge the second DC capacitor 8 during operation.
【０００８】通常、補機電源４は、自励式ＳＶＣ３の設
置需要家から供給されるものであるが、それの容量が大
容量なると、ランニングコストが高くなるし、その容量
が過大の場合には、需要家から供給を受けることができ
なくなる可能性も生ずる。このような場合には他の高圧
回路から低圧に降圧する受電設備が必要になり、設置ス
ペース，コスト共に過大なものになるという問題があ
る。Normally, the auxiliary power supply 4 is supplied from a customer who installs the self-excited SVC 3. However, if the capacity of the auxiliary power supply 4 becomes large, the running cost becomes high, and if the capacity is excessively large. However, there is a possibility that customers will not be able to receive supply. In such a case, there is a problem in that a power receiving facility for reducing the voltage to a low voltage from another high voltage circuit is required, resulting in an excessive installation space and cost.
【０００９】それ故に、本発明の目的は、比較的簡単な
構成によって補機電源の電力容量を増加させることな
く、小容量インバータ回路の直流コンデンサを確実に充
電できる自励式無効電力補償装置を提供することにあ
る。Therefore, an object of the present invention is to provide a self-excited reactive power compensator capable of reliably charging the DC capacitor of the small capacity inverter circuit without increasing the power capacity of the auxiliary power source with a relatively simple structure. To do.
【００１０】[0010]
【課題を解決するための手段】従って、本発明は、上述
の目的を達成するために、系統母線に遮断器を介して直
列接続した第１，第２の変圧器と、系統電圧と同等の補
償電圧を第１の変圧器を介して出力する大容量インバー
タと、系統母線の負荷変動を抑制する補償電圧を第２の
変圧器を介して出力する小容量インバータと、大容量及
び小容量インバータに接続した第１，第２の直流コンデ
ンサと、第１，第２の直流コンデンサを充電する第１，
第２の充電回路とを具備し、前記第１の変圧器に三次巻
線を設け、この三次巻線の出力を第２の充電回路の充電
電源としたものである。Therefore, in order to achieve the above-mentioned object, the present invention provides a first and a second transformer connected in series to a system bus via a circuit breaker and a system voltage equivalent to the system voltage. A large-capacity inverter that outputs a compensation voltage via a first transformer, a small-capacity inverter that outputs a compensation voltage that suppresses load fluctuations on the system busbar via a second transformer, and a large-capacity and small-capacity inverter Connected to the first and second DC capacitors, and the first and second DC capacitors to charge the first and second DC capacitors
A second charging circuit is provided, a tertiary winding is provided on the first transformer, and an output of the tertiary winding is used as a charging power source for the second charging circuit.
【００１１】又、本発明の第２の発明は、前記第１，第
２の直流コンデンサを初期充電する際には、遮断器を開
放状態において、第１の充電回路に補機電源を接続し、
それぞれの直流コンデンサが充電後は、遮断器を閉成し
て系統母線に連系し、第１の充電回路から補機電源を開
放すると共に、系統から第１の変圧器を介してそれぞれ
の直流コンデンサを補充充電するものであり、第３の発
明は、前記充電回路は整流器と、充電変圧器とを含むこ
とを特徴とする。According to a second aspect of the present invention, when initially charging the first and second DC capacitors, an auxiliary power source is connected to the first charging circuit with the breaker opened. ,
After each DC capacitor is charged, the circuit breaker is closed to connect to the system bus, the auxiliary power source is released from the first charging circuit, and each DC is connected from the system through the first transformer. According to a third aspect of the present invention, the charging circuit includes a rectifier and a charging transformer.
【００１２】[0012]
【発明の実施の形態】次に、本発明の１実施例について
図１を参照して説明する。尚、図２に示す従来例と同一
部分には同一参照符号を付し、その詳細な説明は省略す
る。BEST MODE FOR CARRYING OUT THE INVENTION Next, one embodiment of the present invention will be described with reference to FIG. The same parts as those of the conventional example shown in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted.
【００１３】同図において、本発明の特徴部分は、第１
の変圧器１１に三次巻線１１ａを設け、この三次巻線１
１ａの出力を第２の充電回路６の充電電源としたことで
ある。In FIG. 1, the characteristic part of the present invention is the first
The transformer 11 is provided with a tertiary winding 11a.
The output of 1a is used as the charging power source of the second charging circuit 6.
【００１４】この装置は次のように動作する。初期充電
においては、まず、連系用の遮断器２を開放状態におい
て、第１の充電回路５の充電スイッチ５ａを閉成する。
これによって、第１の充電回路５には補機電源４が接続
される。補機電源４の交流は充電変圧器５ｂを介して整
流器５ｃに与えられ、直流に変換されると共に、第１の
直流コンデンサ７が充電される。同コンデンサ７の充電
電圧（直流電圧）が所定の電圧に達すると、大容量イン
バータ９が駆動される。大容量インバータ９の出力は第
１の変圧器１１に与えられる。これによって、第１の変
圧器１１の三次巻線１１ａには交流電圧が生じ、第２の
充電回路６に供給される。整流器６ｃで直流に変換さ
れ、第２の直流コンデンサ８が充電される。そして、同
コンデンサ８が所定の直流電圧に充電されると、小容量
インバータ１０も駆動される。This device operates as follows. In the initial charging, first, the circuit breaker 2 for interconnection is opened and the charging switch 5a of the first charging circuit 5 is closed.
As a result, the auxiliary power source 4 is connected to the first charging circuit 5. The alternating current of the auxiliary power supply 4 is given to the rectifier 5c via the charging transformer 5b, converted into direct current, and the first DC capacitor 7 is charged. When the charging voltage (DC voltage) of the capacitor 7 reaches a predetermined voltage, the large capacity inverter 9 is driven. The output of the large-capacity inverter 9 is given to the first transformer 11. As a result, an AC voltage is generated in the tertiary winding 11a of the first transformer 11 and is supplied to the second charging circuit 6. It is converted into direct current by the rectifier 6c and the second direct current capacitor 8 is charged. Then, when the capacitor 8 is charged to a predetermined DC voltage, the small capacity inverter 10 is also driven.
【００１５】初期充電が完了すると、系統電源１との同
期確認後、連系用の遮断器２が閉成されると共に、第１
の充電回路５の充電スイッチ５ａが開放される。運転
中、第１の直流コンデンサ７は系統電源１から第１の変
圧器１１を介して補充充電され、第２のコンデンサ８は
第１の変圧器１１の三次巻線１１ａを介して補充充電さ
れる。When the initial charging is completed, after confirming the synchronization with the system power supply 1, the circuit breaker 2 for interconnection is closed and the first
The charging switch 5a of the charging circuit 5 is opened. During operation, the first DC capacitor 7 is replenished and charged from the system power supply 1 through the first transformer 11, and the second capacitor 8 is replenished and charged through the tertiary winding 11a of the first transformer 11. It
【００１６】尚、本発明は、何ら上記実施例にのみ制約
されることなく、例えば各インバータのスイッチング素
子はＧＴＯ以外に例えば他の自己消弧素子なども利用で
きる。又、大容量インバータ及び小容量インバータは方
形波及びＰＷＭインバータ以外のものも利用可能であ
る。The present invention is not limited to the above-described embodiment at all, and for example, the switching element of each inverter can use other self-extinguishing element other than GTO. Further, as the large capacity inverter and the small capacity inverter, other than the square wave and PWM inverters can be used.
【００１７】[0017]
【発明の効果】以上のように、本発明によれば、第１の
変圧器に三次巻線を設け、この三次巻線の出力を第２の
直流コンデンサの充電電源として用いるように構成され
ているために、補機電源は初期充電の時にのみ利用され
る。従って、補機電源の容量を小さく設定できるため
に、設備の小型化，低コスト化も可能となる。As described above, according to the present invention, the first transformer is provided with the tertiary winding, and the output of the tertiary winding is used as the charging power source for the second DC capacitor. Therefore, the auxiliary power source is used only during initial charging. Therefore, since the capacity of the auxiliary power supply can be set small, the equipment can be downsized and the cost can be reduced.
【００１８】又、第２の直流コンデンサは、初期充電の
際には大容量インバータの出力に関連して第１の変圧器
の三次巻線に発生する交流電圧に基づいて充電され、系
統連系時には系統電源から第１の変圧器の三次巻線を介
して充電されるために、補機電源の容量に左右されるこ
となく、設備の設置が可能になる。Further, the second DC capacitor is charged at the time of initial charging based on the AC voltage generated in the tertiary winding of the first transformer in relation to the output of the large capacity inverter, and the system interconnection is established. Since it is sometimes charged from the system power supply through the tertiary winding of the first transformer, the equipment can be installed without being affected by the capacity of the auxiliary power supply.
【００１９】特に、第１の変圧器に新たに三次巻線を設
け、この三次巻線の出力を第２の直流コンデンサの充電
電源としている関係で、第２の充電スイッチを省略で
き、回路構成を簡素化できる。In particular, since the third transformer is newly provided with the tertiary winding and the output of the tertiary winding is used as the charging power source for the second DC capacitor, the second charging switch can be omitted and the circuit configuration can be improved. Can be simplified.
【図１】本発明の一実施例を示す電気回路図。FIG. 1 is an electric circuit diagram showing one embodiment of the present invention.
【図２】従来例の電気回路図。FIG. 2 is an electric circuit diagram of a conventional example.
１ 系統電源 ２ 遮断器 ３ 自励式ＳＶＣ ４ 補機電源 ５ 第１の充電回路 ５ａ 充電スイッチ ６ 第２の充電回路 ７ 第１の直流コンデンサ ８ 第２の直流コンデンサ ９ 大容量インバータ １０ 小容量インバータ １１ 第１の変圧器 １１ａ 三次巻線 １２ 第２の変圧器 1 System Power Supply 2 Circuit Breaker 3 Self-Exciting SVC 4 Auxiliary Machine Power Supply 5 First Charging Circuit 5a Charging Switch 6 Second Charging Circuit 7 First DC Capacitor 8 Second DC Capacitor 9 Large Capacity Inverter 10 Small Capacity Inverter 11 1st transformer 11a Tertiary winding 12 2nd transformer
Claims (3)
第１，第２の変圧器と、系統電圧と同等の補償電圧を第
１の変圧器を介して出力する大容量インバータと、系統
母線の負荷変動を抑制する補償電圧を第２の変圧器を介
して出力する小容量インバータと、大容量及び小容量イ
ンバータに接続した第１，第２の直流コンデンサと、第
１，第２の直流コンデンサを充電する第１，第２の充電
回路とを具備し、前記第１の変圧器に三次巻線を設け、
この三次巻線の出力を第２の充電回路の充電電源とした
ことを特徴とする自励式無効電力補償装置。1. A first and a second transformer connected in series to a system bus via a circuit breaker, a large-capacity inverter for outputting a compensation voltage equivalent to the system voltage via a first transformer, and a system. A small-capacity inverter that outputs a compensation voltage that suppresses load fluctuations of the busbar through a second transformer; first and second DC capacitors that are connected to the large-capacity and small-capacity inverters; A first and a second charging circuit for charging a DC capacitor, wherein a tertiary winding is provided on the first transformer,
A self-excited var compensator, wherein the output of the tertiary winding is used as a charging power source for the second charging circuit.
充電する際には、遮断器を開放状態において、第１の充
電回路に補機電源を接続し、それぞれの直流コンデンサ
が充電後は、第１の充電回路から補機電源を開放するこ
とを特徴とする請求項１記載の自励式無効電力補償装
置。2. When initially charging the first and second DC capacitors, with the breaker opened, an auxiliary power source is connected to the first charging circuit, and after charging the respective DC capacitors, 2. The self-excited reactive power compensator according to claim 1, wherein the auxiliary power supply is released from the first charging circuit.
を含むことを特徴とする請求項１記載の自励式無効電力
補償装置。3. The self-excited reactive power compensator according to claim 1, wherein the charging circuit includes a rectifier and a charging transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8000924A JPH09191577A (en) | 1996-01-08 | 1996-01-08 | Self-excited reactive power compensation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8000924A JPH09191577A (en) | 1996-01-08 | 1996-01-08 | Self-excited reactive power compensation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09191577A true JPH09191577A (en) | 1997-07-22 |
Family
ID=11487247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8000924A Withdrawn JPH09191577A (en) | 1996-01-08 | 1996-01-08 | Self-excited reactive power compensation device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09191577A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976849A (en) * | 2010-09-30 | 2011-02-16 | 山东计保电气有限公司 | Method and device for intelligently switching on and off transformer set |
| CN102946095A (en) * | 2012-11-27 | 2013-02-27 | 东南大学 | Method and device for suppressing overvoltage of power distribution network caused by distributed power generation |
| WO2019049325A1 (en) * | 2017-09-08 | 2019-03-14 | 株式会社東芝 | Power conversion device |
-
1996
- 1996-01-08 JP JP8000924A patent/JPH09191577A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976849A (en) * | 2010-09-30 | 2011-02-16 | 山东计保电气有限公司 | Method and device for intelligently switching on and off transformer set |
| CN102946095A (en) * | 2012-11-27 | 2013-02-27 | 东南大学 | Method and device for suppressing overvoltage of power distribution network caused by distributed power generation |
| WO2019049325A1 (en) * | 2017-09-08 | 2019-03-14 | 株式会社東芝 | Power conversion device |
| JP6538990B1 (en) * | 2017-09-08 | 2019-07-03 | 株式会社東芝 | Power converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030401 |