JPH08196040A - Distribution power supply system - Google Patents
Distribution power supply systemInfo
- Publication number
- JPH08196040A JPH08196040A JP7019978A JP1997895A JPH08196040A JP H08196040 A JPH08196040 A JP H08196040A JP 7019978 A JP7019978 A JP 7019978A JP 1997895 A JP1997895 A JP 1997895A JP H08196040 A JPH08196040 A JP H08196040A
- Authority
- JP
- Japan
- Prior art keywords
- power
- control circuit
- power distribution
- distribution system
- voltage
- 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.)
- Pending
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
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
Landscapes
- Photovoltaic Devices (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、太陽電池で発生した直
流電力を交流電力に変換し、電力配電系統に供給するよ
うにした分散型電源システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed power supply system for converting DC power generated by a solar cell into AC power and supplying the AC power to a power distribution system.
【０００２】[0002]
【従来の技術】太陽電池で発生した直流電力をインバー
タ回路で交流電力に変換し、その交流電力を電力配電系
統に供給するようにした分散型電源システムとしては、
図６に示すようなものがある。2. Description of the Related Art As a distributed power supply system in which DC power generated by a solar cell is converted into AC power by an inverter circuit and the AC power is supplied to a power distribution system,
There is one as shown in FIG.
【０００３】図６において、太陽電池１が発生する直流
電力は電力変換装置２で交流電力に変換され、分電盤１
７を介して、負荷１４ａ〜１４ｎ、及び電力系統１８に
供給される。この様な系統連系するシステムは、「分散
型電源系統連系技術指針（ＪＥＡＧ９７０１−１９９
３）」に定められている系統連系条件を満たす必要があ
る。その中で、電力系統１８の品質を維持するために、
電力変換装置２に連系保護装置１１を付属することが義
務付けられており、また、系統喪失時に分散型電源シス
テムが電力系統に接続されたままの状態で運転を継続し
ないことが必要とされている。その一方で、系統から切
り放された状態で分散型電源システムを運転することが
分散型電源システムの付加価値を高めるオプションとし
て重視されている。In FIG. 6, the DC power generated by the solar cell 1 is converted into AC power by the power converter 2 and the distribution board 1
It is supplied to the loads 14 a to 14 n and the electric power system 18 via 7. Such a system interconnection system is described in "Technical Guideline for Distributed Power System Interconnection (JEAG 9701-199).
It is necessary to meet the grid interconnection conditions specified in “3)”. Among them, in order to maintain the quality of the power system 18,
It is obliged to attach the interconnection protection device 11 to the power conversion device 2, and it is required that the distributed power supply system does not continue to operate in a state of being connected to the power system when the system is lost. There is. On the other hand, operating the distributed power supply system in a state of being disconnected from the grid is emphasized as an option for increasing the added value of the distributed power supply system.
【０００４】電力変換装置２のインバータ回路３は、太
陽電池１の直流電力を交流電力に変換するものである。
インバータ回路３により変換された交流電力の電流レベ
ルは、電流検出器５で検出され、電流制御回路７で所定
の出力電流となるように電流制御される。すなわち、電
流制御回路７からの制御指令はゲートドライブ４に入力
され、ゲートドライブ４からのゲートパルスによりイン
バータ回路３を電流制御する。系統状態検出器１２は、
電力変換装置２の出力端における交流電力の状態を検出
し、その情報を連系保護装置１１に伝える。連携保護装
置１１は系統状態検出器１２からの情報に基づき、開閉
器１０の開閉状態及びゲートドライブ４の動作状態を制
御する。The inverter circuit 3 of the power conversion device 2 converts the DC power of the solar cell 1 into AC power.
The current level of the AC power converted by the inverter circuit 3 is detected by the current detector 5, and the current control circuit 7 controls the current so that the output current becomes a predetermined output current. That is, the control command from the current control circuit 7 is input to the gate drive 4, and the inverter circuit 3 is current-controlled by the gate pulse from the gate drive 4. The system state detector 12 is
The state of the AC power at the output end of the power conversion device 2 is detected and the information is transmitted to the interconnection protection device 11. The cooperation protection device 11 controls the open / closed state of the switch 10 and the operating state of the gate drive 4 based on the information from the system state detector 12.
【０００５】こうして電力変換装置２によって分電盤１
７に供給される交流電力はフィーダー用遮断器１３Ａを
介して電力配電系統の配電母線に供給され、この配電母
線からそれぞれのフィーダー用遮断器１３ａ〜１３ｎを
介して負荷１４ａ〜１４ｎに与えられる。また、主幹漏
電遮断器１５及びサービスブレーカ１６を通して電力系
統１８に逆潮流される場合もある。In this way, the distribution board 1 by the power converter 2
The AC power supplied to 7 is supplied to the distribution busbar of the power distribution system via the feeder breaker 13A, and is supplied to the loads 14a to 14n from the distribution busbar via the feeder breakers 13a to 13n. In addition, there is also a case where reverse power flow is performed to the electric power system 18 through the main earth leakage breaker 15 and the service breaker 16.
【０００６】ここで、連携保護装置１１は、系統状態検
出器１２からの情報に基づき、電力変換装置２の出力端
における交流電力の状態が異常であると判定したとき
は、開閉器１０の閉じ、ゲートドライブ４のを制御して
インバータ回路３の出力を絞るように動作する。これに
よって、分散型電源システムが電力系統に接続されたま
まの状態で運転を継続しないようにしている。[0006] Here, when the cooperation protection device 11 determines that the state of the AC power at the output end of the power conversion device 2 is abnormal based on the information from the system state detector 12, the switch 10 is closed. , The gate drive 4 is controlled to operate so as to reduce the output of the inverter circuit 3. This prevents the distributed power supply system from continuing to operate in a state where it is connected to the power system.
【０００７】[0007]
【発明が解決しようとする課題】ところが、このような
分散型電源システムでは、太陽電池１が直流電力を発生
していても、電力配電系統が停電等の異常事態に陥って
いる場合には、負荷１４ａ〜１４ｎに電力を供給するこ
とができないという問題を抱えている。However, in such a distributed power supply system, even when the solar cell 1 generates DC power, when the power distribution system is in an abnormal situation such as a power failure, There is a problem that power cannot be supplied to the loads 14a to 14n.
【０００８】また、電力配電系統が停電等の異常事態に
陥った場合、電力変換装置２を連系運転から自立運転に
移行させることができないので、コンピューター等の瞬
時の停電も許されない重要負荷が分電盤１７内の配電母
線に接続されている場合には、これら重要機器に異常を
生じることになる。Further, when the power distribution system falls into an abnormal situation such as a power failure, the power conversion device 2 cannot be switched from the interconnected operation to the self-sustaining operation. When connected to the power distribution bus in the distribution board 17, an abnormality will occur in these important devices.
【０００９】本発明の目的は、電力系統に異常が起きた
場合に電力変換装置を自立運転させ、その後、電力配電
系統が正常に復帰した場合に系統連系運転に戻すことが
できる分散型電源システムを得ることである。An object of the present invention is to provide a distributed power source capable of independently operating a power converter when an abnormality occurs in a power system and then returning to a grid interconnection operation when the power distribution system returns to normal. To get the system.
【００１０】[0010]
【課題を解決するための手段】本発明の分散型電源シス
テムは、電力配電系統との系統連系運転のときはインバ
ータ回路の出力電流を制御する電流制御回路と、自立運
転のときはインバータ回路の出力電圧を制御する電圧制
御回路と、電力配電系統の配電母線が収納された分電盤
内に設けられ電力配電系統の状態を検出する系統状態検
出器と、系統状態検出器の検出信号に基づいて電力配電
系統に異常が発生したと判定したときはインバータ回路
の制御を電圧制御回路から電流制御回路に切替え異常が
除去された判断したときはインバータ回路の制御を電流
制御回路から電圧制御回路に切替える連系保護装置とを
備えている。DISCLOSURE OF THE INVENTION The distributed power supply system of the present invention comprises a current control circuit for controlling the output current of an inverter circuit during grid interconnection operation with a power distribution system, and an inverter circuit during self-sustaining operation. The voltage control circuit that controls the output voltage of the power distribution system, the system status detector that detects the status of the power distribution system installed in the distribution board that houses the distribution bus of the power distribution system, and the detection signal of the system status detector If it is determined that an abnormality has occurred in the power distribution system based on the above, the control of the inverter circuit is switched from the voltage control circuit to the current control circuit.If it is determined that the abnormality is removed, the control of the inverter circuit is changed from the current control circuit to the voltage control circuit. It is equipped with an interconnection protection device that switches to.
【００１１】そして、連系保護装置では、電力配電系統
の電圧が正常範囲であること、電力配電系統の周波数が
正常範囲であること、自立運転でないこと、電力配電系
統の電圧が電圧上昇抑制範囲内であること、のいずれか
一つが成立しなくなったときに電力配電系統に異常が発
生したと判定する。In the interconnection protection device, the voltage of the power distribution system is within the normal range, the frequency of the power distribution system is within the normal range, the self-sustaining operation is not performed, and the voltage of the power distribution system is within the voltage rise suppression range. It is determined that an abnormality has occurred in the power distribution system when any one of the above is not satisfied.
【００１２】分電盤内には、自立運転となったときは電
力配電系統に接続された負荷のうち重要負荷に対してイ
ンバータ回路からの交流電力が供給されるように電力配
電系統の接続構成を切替えるための開閉器を備えてい
る。また、分電盤内に、太陽電池を除く分散型電源シス
テムの構成要素を収納するようにしている。In the distribution board, the connection configuration of the power distribution system is such that, when the operation is self-sustaining, the AC power from the inverter circuit is supplied to the important load among the loads connected to the power distribution system. It is equipped with a switch for switching. Moreover, the components of the distributed power supply system other than the solar cells are housed in the distribution board.
【００１３】[0013]
【作用】電力配電系統との系統連系運転のときは電流制
御回路でインバータ回路の出力電流を制御し、自立運転
のときは電圧制御回路でインバータ回路の出力電圧を制
御する。そして、連系保護装置にて、系統状態検出器の
検出信号に基づいて電力配電系統に異常が発生したと判
定したときはインバータ回路の制御を電圧制御回路から
電流制御回路に切替え、異常が除去された判断したとき
はインバータ回路の制御を電流制御回路から電圧制御回
路に切替える。自立運転となったときは、電力配電系統
の接続構成を開閉器で切替えて、電力配電系統に接続さ
れた負荷のうち重要負荷に対してインバータ回路からの
交流電力が供給する。When the system is connected to the power distribution system, the current control circuit controls the output current of the inverter circuit, and when the system is self-sustaining, the voltage control circuit controls the output voltage of the inverter circuit. When the interconnection protection device determines that an abnormality has occurred in the power distribution system based on the detection signal of the system state detector, it switches the control of the inverter circuit from the voltage control circuit to the current control circuit and eliminates the abnormality. When the judgment is made, the control of the inverter circuit is switched from the current control circuit to the voltage control circuit. When the operation is self-sustaining, the connection configuration of the power distribution system is switched by the switch, and the AC power from the inverter circuit is supplied to the important load among the loads connected to the power distribution system.
【００１４】[0014]
【実施例】以下に本発明の実施例について説明する。図
１は本発明の実施例の構成図である。図６に示した従来
例のものと同一要素には同一符号を付しその説明を省略
する。この第１の実施例では、系統状態検出器１２及び
開閉器１０が分電盤１７内の電力配電線系統の配電母線
に設けられている。つまり、自立運転となったとき、重
要負荷１４ａに優先的にインバータ回路３からの交流電
力を供給できるように開閉器１０にて電力配電線系統の
系統構成を切替える。EXAMPLES Examples of the present invention will be described below. FIG. 1 is a block diagram of an embodiment of the present invention. The same elements as those of the conventional example shown in FIG. 6 are designated by the same reference numerals, and the description thereof will be omitted. In the first embodiment, the system state detector 12 and the switch 10 are provided in the distribution bus of the power distribution line system in the distribution board 17. That is, when the self-sustaining operation is performed, the system configuration of the power distribution line system is switched by the switch 10 so that the AC power from the inverter circuit 3 can be preferentially supplied to the important load 14a.
【００１５】また、インバータ回路３の制御装置として
の電流制御回路７に加えて、電圧制御回路８を新たに設
けている。そして、電力配電系統との系統連系運転のと
きは電流制御回路７でインバータ回路３を制御し、自立
運転のときは電圧制御回路８でインバータ回路３を制御
するように制御切替えスイッチ９により切替える。制御
切替えスイッチ９は、連系保護装置１１により制御され
る。A voltage control circuit 8 is newly provided in addition to the current control circuit 7 as a control device for the inverter circuit 3. When the system is connected to the power distribution system, the current control circuit 7 controls the inverter circuit 3, and when the system is self-sustaining, the voltage control circuit 8 controls the inverter circuit 3 by the control changeover switch 9. . The control changeover switch 9 is controlled by the interconnection protection device 11.
【００１６】これにより、電力配電系統との系統連系運
転のときは、電流制御回路７にてインバータ回路３の出
力電流を制御し、自立運転のときは電圧制御回路８によ
りインバータ回路３の出力電圧を制御する。連系保護装
置１１は、系統状態検出器１２の検出信号に基づいて電
力配電系統に異常が発生したと判定したときはインバー
タ回路３の制御を電圧制御回路７から電流制御回路に切
替え、異常が除去された判断したときはインバータ回路
３の制御を電流制御回路７から電圧制御回路８に切替え
る。As a result, the current control circuit 7 controls the output current of the inverter circuit 3 during grid interconnection operation with the power distribution system, and the voltage control circuit 8 outputs the output of the inverter circuit 3 during self-sustaining operation. Control the voltage. When the interconnection protection device 11 determines that an abnormality has occurred in the power distribution system based on the detection signal of the system state detector 12, it switches the control of the inverter circuit 3 from the voltage control circuit 7 to the current control circuit, and the abnormality is detected. When it is determined that the voltage is removed, the control of the inverter circuit 3 is switched from the current control circuit 7 to the voltage control circuit 8.
【００１７】すなわち、太陽電池１が発生する直流電力
は電力変換装置２で交流電力に変換され、分電盤１７を
介して負荷１４ａ〜１４ｎ、さらには電力系統１８に供
給される。電力変換装置２の運転状態は、図２の運転制
御条件によって決定される。図２から分かるように、電
力変換装置２が系統連系運転をするときは、「電力配電
系統の電圧が正常範囲であること」、「電力配電系統の
周波数が正常範囲であること」、「自立運転でないこ
と」、「電力配電系統の電圧が電圧上昇抑制範囲内であ
ること」、の諸条件がすべて満たされている場合であ
り、逆に自立運転をするときは上記条件のうち、いづれ
かが満たされていない場合である。That is, the DC power generated by the solar cell 1 is converted into AC power by the power converter 2 and supplied to the loads 14a to 14n and the power system 18 via the distribution board 17. The operation state of the power converter 2 is determined by the operation control conditions of FIG. As can be seen from FIG. 2, when the power conversion device 2 performs the grid interconnection operation, “the voltage of the power distribution system is in the normal range”, “the frequency of the power distribution system is in the normal range”, “ This is the case when all the conditions of "not self-sustaining operation" and "the voltage of the power distribution system is within the voltage rise suppression range" are satisfied. Is not satisfied.
【００１８】次に、分電盤１７の中の瞬時の停電も許さ
れないコンピューター等の重要負荷１４ａの上位のフィ
ーダー用遮断器１３ａと主幹漏電遮断器１５との間に、
開閉器１０と系統状態検出器１２を設置している。系統
状態検出器１２で検出された電力配電系統の状態に基づ
いて、連系保護装置１１はその異常を判定する。Next, between the main circuit breaker 13 and the feeder breaker 13a of the upper load of the important load 14a such as a computer in the distribution board 17 which is not allowed to have an instantaneous power failure,
A switch 10 and a system state detector 12 are installed. Based on the state of the power distribution system detected by the system state detector 12, the interconnection protection device 11 determines the abnormality.
【００１９】電力変換装置２が系統連系運転をしている
ときは連系保護装置１１の情報により、制御切換スイッ
チ９が電流制御装置７を選択をしているときであり、イ
ンバータ回路３によって変換された交流電力の電流レベ
ルを電流検出器５が検出し、電流制御回路７はゲートド
ライブ４を介してインバータ回路３を電流制御する。一
方、電力変換装置２が自立運転をしているときは、制御
切換スイッチ９が電圧制御を選択しているときであり、
インバータ回路３によって変換された交流電力の電圧レ
ベルを電圧検出器６が検出し、電圧制御回路８はゲート
ドライブ４を介してインバータ回路３を電圧制御する。When the power conversion device 2 is in the grid interconnection operation, the control changeover switch 9 is selecting the current control device 7 according to the information of the interconnection protection device 11, and the inverter circuit 3 is used. The current level of the converted AC power is detected by the current detector 5, and the current control circuit 7 controls the current of the inverter circuit 3 via the gate drive 4. On the other hand, when the power conversion device 2 is in the self-sustaining operation, the control changeover switch 9 is selecting the voltage control,
The voltage detector 6 detects the voltage level of the AC power converted by the inverter circuit 3, and the voltage control circuit 8 controls the voltage of the inverter circuit 3 via the gate drive 4.
【００２０】系統連系運転している際の電力変換装置２
から発生する交流電力は、分電盤１７のフィーダー用遮
断器１３Ａを介して電力配電線の配電母線に供給され、
さらにフィーダー用遮断器１３ａ〜１３ｎを介して、そ
れぞれの負荷１４ａ〜１４ｎに供給される。場合によっ
ては、主観漏電遮断器１５及びサービスブレーカ１６を
介して電力系統１８に逆潮流されたりする。Power conversion device 2 during grid interconnection operation
AC power generated from the power is supplied to the distribution bus of the power distribution line via the feeder breaker 13A of the distribution board 17,
Furthermore, it is supplied to the respective loads 14a to 14n via the feeder breakers 13a to 13n. In some cases, reverse flow may occur in the electric power system 18 via the subjective earth leakage breaker 15 and the service breaker 16.
【００２１】次に図３には、系統連系運転から自立運転
への切替えフローチャートを示す。分散型電源システム
が系統連系運転しているときは、電力変換装置２は電流
制御回路７にて電流制御されている（Ｓ１）。この状態
で、電力系統１８が停電等の異常事態に陥った場合（Ｓ
２）には、系統状態検出器１２がその状態を検出し（Ｓ
３）、連系保護装置１１にてその異常が判定され（Ｓ
４）、その情報に基づいて制御切換スイッチ９は電圧制
御回路８に切替えられ（Ｓ５）、また開閉器１０は開と
なる（Ｓ６）。この状態になったときに電力変換装置２
は系統連系運転から自立運転に切り換えられる（Ｓ
７）。Next, FIG. 3 shows a flow chart for switching from system interconnection operation to independent operation. When the distributed power supply system is in grid-connected operation, the power converter 2 is current-controlled by the current control circuit 7 (S1). In this state, if the power system 18 falls into an abnormal situation such as a power failure (S
In 2), the system state detector 12 detects the state (S
3), the interconnection protection device 11 determines the abnormality (S
4) Based on the information, the control changeover switch 9 is changed over to the voltage control circuit 8 (S5), and the switch 10 is opened (S6). When this state is reached, the power converter 2
Is switched from grid-connected operation to independent operation (S
7).
【００２２】一方、図４には、自立運転から系統連系運
転への切替えフローチャートを示す。分散型電源システ
ムが自立運転をしているときは、電力変換装置２は電圧
制御回路８にて電圧制御されている（Ｓ１）。電力系統
１８が停電等の異常事態から正常に復帰した場合（Ｓ
２）は、系統状態検出器１２にて電力系統１８が正常状
態であることを検出し（Ｓ３）、連系保護装置１１はそ
れを判定する（Ｓ４）。その情報は制御切換スイッチ９
に与えられ、制御切換スイッチ９は電圧制御回路８から
電流制御回路７に切り替える（Ｓ５）。そして、電力変
換装置２をの出力電圧を電力系統１８と同期させ（Ｓ
６）、その後に、開閉器１０を閉にし（Ｓ７）、系統連
系運転に切り換える（Ｓ８）。On the other hand, FIG. 4 shows a flow chart for switching from the independent operation to the grid interconnection operation. When the distributed power supply system is operating independently, the power conversion device 2 is voltage-controlled by the voltage control circuit 8 (S1). When the power system 18 returns to normal from an abnormal situation such as a power failure (S
In 2), the system state detector 12 detects that the power system 18 is in a normal state (S3), and the interconnection protection device 11 determines that (S4). The information is the control changeover switch 9
Control switch 9 switches from voltage control circuit 8 to current control circuit 7 (S5). Then, the output voltage of the power conversion device 2 is synchronized with the power system 18 (S
6) After that, the switch 10 is closed (S7) and the system interconnection operation is switched to (S8).
【００２３】このようにこの実施例によれば、分電盤１
７内に系統状態検出器１２と開閉器１０を設けることに
よって、電力系統１８が停電等の異常事態に陥った場
合、電力変換装置２は瞬時に系統連系運転から自立運転
に移行し、逆に、電力系統１８が正常に復帰した場合、
瞬時に自立運転から系統連系運転に移行して、負荷に異
常を与えないことが可能となる。Thus, according to this embodiment, the distribution board 1
When the power system 18 falls into an abnormal situation such as a power failure by providing the system state detector 12 and the switch 10 in the power conversion system 7, the power conversion device 2 instantaneously shifts from the system interconnection operation to the independent operation, and reversely. When the power system 18 returns to normal,
It is possible to instantly shift from the independent operation to the grid-connected operation and to prevent the load from being abnormal.
【００２４】以上説明した実施例では、分電盤１７と電
力変換装置２との間に、系統状態検出器１２から連系保
護装置１１、及び連系保護装置１１から開閉器１０の２
本の外部の配線が必要となるので不便である。このこと
を考慮した本発明による他の実施例を図５に示す。図５
は、系統状態検出器１２と開閉器１０とともに、電力変
換装置２を分電盤１７と一体化する。これにより、電力
変換装置２自体の小形化を図ったものである。In the embodiment described above, between the distribution board 17 and the power conversion device 2, the system state detector 12 to the interconnection protection device 11 and the interconnection protection device 11 to the switch 10 are provided.
This is inconvenient because wiring outside the book is required. Another embodiment according to the present invention in consideration of this is shown in FIG. Figure 5
Integrates the power conversion device 2 with the distribution board 17 together with the system state detector 12 and the switch 10. As a result, the power conversion device 2 itself is downsized.
【００２５】[0025]
【発明の効果】以上述べたように本発明によれば、電力
系統の異常を検出する系統状態検出器と開閉器とを分電
盤に設け、電力系統の異常を検出した場合には、電力系
統に電力変換装置から発生する交流電力が逆潮流しない
ようにし、負荷の一部に停電等の異常事態でも太陽電池
からの電力を供給できる自立運転に自動的に切替え、そ
の逆に、電力系統が正常に復帰した場合には、自立運転
から系統連系運転に自動的に切替える。As described above, according to the present invention, a system state detector for detecting an abnormality in the power system and a switch are provided in the distribution board, and when an abnormality in the power system is detected, the The AC power generated by the power converter does not flow backward to the grid, and it automatically switches to a self-sustaining operation that can supply power from the solar cell even in an abnormal situation such as a power outage to part of the load. When is restored to normal, it automatically switches from independent operation to system interconnection operation.
【００２６】したがって、電力系統に異常が発生しても
分散型電源システムの運転を停止することがないので、
より多くの発電量を得られ、また、瞬時に運転状態を切
り換えられるので、コンピューター等の瞬時の停電も許
されない重要負荷にスムーズに電力を供給できる。Therefore, the operation of the distributed power supply system is not stopped even if an abnormality occurs in the power system.
Since more power can be obtained and the operating state can be switched instantaneously, it is possible to supply power smoothly to important loads such as computers where instantaneous power failure is not allowed.
【００２７】また、分電盤に電力変換装置の機能を内蔵
し、一体化することによって、分電盤と電力変換装置と
の間の配線を無くし、分散型電源システムの設置を容易
にし、かつ、一体化によるコストダウンが図れる。Further, by incorporating and integrating the function of the power conversion device in the distribution board, wiring between the distribution board and the power conversion device is eliminated to facilitate the installation of the distributed power supply system, and The cost can be reduced by the integration.
【図１】本発明の実施例の構成図FIG. 1 is a configuration diagram of an embodiment of the present invention.
【図２】本発明での系統連系運転から自立運転への切替
え判定基準の説明図FIG. 2 is an explanatory diagram of a criterion for switching from grid-connected operation to independent operation according to the present invention.
【図３】本発明での系統連系運転から自立運転への切替
えフローチャートFIG. 3 is a flow chart for switching from grid interconnection operation to independent operation according to the present invention.
【図４】本発明での自立運転から系統連系運転への切替
えフローチャートFIG. 4 is a flowchart for switching from independent operation to system interconnection operation according to the present invention.
【図５】本発明の他の実施例の構成図FIG. 5 is a configuration diagram of another embodiment of the present invention.
【図６】従来例の構成図FIG. 6 is a block diagram of a conventional example
１ 太陽電池 ２ 電力変換装置 ３ インバータ回路 ４ ゲートドライブ ５ 電流検出器 ６ 電圧検出器 ７ 電流制御回路 ８ 電圧制御回路 ９ 制御切替えスイッチ １０ 開閉器 １１ 連系保護装置 １２ 系統状態検出器 １３ フィーダー用遮断器 １４ 負荷 １５ 主幹漏電遮断器 １６ サービスブレーカ １７ 分電盤 １８ 電力系統 1 Solar Cell 2 Power Converter 3 Inverter Circuit 4 Gate Drive 5 Current Detector 6 Voltage Detector 7 Current Control Circuit 8 Voltage Control Circuit 9 Control Changeover Switch 10 Switcher 11 Interconnection Protection Device 12 System Status Detector 13 Feeder Breaker Device 14 Load 15 Main earth leakage circuit breaker 16 Service breaker 17 Distribution board 18 Power system
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０２Ｊ 13/00 ３０１ Ｄ Ｈ０２Ｍ 7/48 Ｒ 9181−5Ｈ Ｅ 9181−5Ｈ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI Technical indication location H02J 13/00 301 D H02M 7/48 R 9181-5H E 9181-5H
Claims (4)
タ回路で交流電力に変換し、電力配電系統に前記交流電
力を供給するようにした分散型電源システムにおいて、
前記電力配電系統との系統連系運転のときは前記インバ
ータ回路の出力電流を制御する電流制御回路と、自立運
転のときは前記インバータ回路の出力電圧を制御する電
圧制御回路と、前記電力配電系統の配電母線が収納され
た分電盤内に設けられ前記電力配電系統の状態を検出す
る系統状態検出器と、前記系統状態検出器の検出信号に
基づいて前記電力配電系統に異常が発生したと判定した
ときは前記インバータ回路の制御を前記電圧制御回路か
ら前記電流制御回路に切替え前記異常が除去された判断
したときは前記インバータ回路の制御を前記電流制御回
路から前記電圧制御回路に切替える連系保護装置とを備
えたことを特徴とする分散型電源システム。1. A distributed power system in which DC power generated by a solar cell is converted into AC power by an inverter circuit and the AC power is supplied to a power distribution system,
A current control circuit that controls the output current of the inverter circuit during grid interconnection operation with the power distribution system, a voltage control circuit that controls the output voltage of the inverter circuit during independent operation, and the power distribution system And a system state detector for detecting the state of the power distribution system provided in a distribution board accommodating the power distribution bus, and that an abnormality has occurred in the power distribution system based on a detection signal of the system state detector. When it is determined, the control of the inverter circuit is switched from the voltage control circuit to the current control circuit, and when it is determined that the abnormality is eliminated, the control of the inverter circuit is switched from the current control circuit to the voltage control circuit. A distributed power supply system comprising a protection device.
の電圧が正常範囲であること、前記電力配電系統の周波
数が正常範囲であること、前記自立運転でないこと、前
記電力配電系統の電圧が電圧上昇抑制範囲内であるこ
と、のいずれか一つが成立しなくなったときに前記電力
配電系統に異常が発生したと判定するようにしたことを
特徴とする請求項１に記載の分散型電源システム。2. The interconnection protection device, wherein the voltage of the power distribution system is in a normal range, the frequency of the power distribution system is in a normal range, the self-sustaining operation is not performed, and the voltage of the power distribution system is Is within the voltage rise suppression range, and it is determined that an abnormality has occurred in the power distribution system when any one of the above is not satisfied. system.
となったときは前記電力配電系統に接続された負荷のう
ち重要負荷に対して前記インバータ回路からの交流電力
が供給されるように前記電力配電系統の接続構成を切替
えるための開閉器を備えたことを特徴とする請求項１又
は請求項２に記載の分散型電源システム。3. The AC power from the inverter circuit is supplied to an important load among loads connected to the power distribution system, which is provided in the distribution board and operates in the self-sustaining mode. The distributed power supply system according to claim 1 or 2, further comprising a switch for switching a connection configuration of the power distribution system.
散型電源システムの構成要素を収納したことを特徴とす
る請求項１乃至請求項３に記載の分散型電源システム。4. The distributed power supply system according to claim 1, wherein constituent elements of the distributed power supply system other than the solar cell are housed in the distribution board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7019978A JPH08196040A (en) | 1995-01-13 | 1995-01-13 | Distribution power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7019978A JPH08196040A (en) | 1995-01-13 | 1995-01-13 | Distribution power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08196040A true JPH08196040A (en) | 1996-07-30 |
Family
ID=12014284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7019978A Pending JPH08196040A (en) | 1995-01-13 | 1995-01-13 | Distribution power supply system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08196040A (en) |
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1995
- 1995-01-13 JP JP7019978A patent/JPH08196040A/en active Pending
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|---|---|---|---|---|
| JP2009027877A (en) * | 2007-07-23 | 2009-02-05 | Kawamura Electric Inc | Power distribution board |
| CN102468687A (en) * | 2010-11-08 | 2012-05-23 | 广东天富电气有限公司 | Microcomputer-controlled direct current (DC) power cabinet |
| CN102769256A (en) * | 2011-05-04 | 2012-11-07 | 天津市中力防雷技术有限公司 | Novel distribution system equipment |
| CN102222886A (en) * | 2011-06-23 | 2011-10-19 | 周庆生 | Protection device and method for high-voltage vacuum power distribution equipment for mining |
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| JP2014147162A (en) * | 2013-01-28 | 2014-08-14 | Mitsubishi Electric Corp | Power conversion device, power supply system, and power supply method |
| CN103337907A (en) * | 2013-05-30 | 2013-10-02 | 中国科学院长春光学精密机械与物理研究所 | Intelligent AC (alternating current) distribution system for large-scale telescope control system |
| JP2015220791A (en) * | 2014-05-14 | 2015-12-07 | 三菱電機株式会社 | Power supply control device |
| CN104037941A (en) * | 2014-06-05 | 2014-09-10 | 中国海洋石油总公司 | Control protection system for flexible direct-current power transmission system |
| KR20160083777A (en) * | 2014-12-31 | 2016-07-12 | 주식회사 포스코아이씨티 | System and Method for GRID-SEPARATING of Plurality of Energy Storage Syetem |
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