JP6351351B2 - Power supply system - Google Patents

Power supply system Download PDF

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JP6351351B2
JP6351351B2 JP2014090261A JP2014090261A JP6351351B2 JP 6351351 B2 JP6351351 B2 JP 6351351B2 JP 2014090261 A JP2014090261 A JP 2014090261A JP 2014090261 A JP2014090261 A JP 2014090261A JP 6351351 B2 JP6351351 B2 JP 6351351B2
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power
electric vehicle
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discharging device
vehicle charging
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誠 春日井
誠 春日井
直秀 土本
直秀 土本
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Mitsubishi Electric Corp
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Description

本発明は、電力供給システムに関する。   The present invention relates to a power supply system.

近年、電気自動車の増加に伴い、電気自動車充放電装置を設置する住宅が増加している。電気自動車充放電装置は、商用系統からの交流電力を直流電力に変換し、電気自動車の蓄電池を充電する。また、電気自動車充放電装置は、商用系統停止時（停電時）において、電気自動車の蓄電池の直流電力を交流電力に変換し、住宅内負荷に交流電力を供給することができる。住宅に太陽光発電システムが設置されている場合、電気自動車充放電装置では、太陽光発電用電力変換装置と接続し、太陽光発電用電力変換装置から入力した交流電力を用いて、電気自動車用の蓄電池を充電し、また、住宅内負荷に交流電力を供給することができる（例えば、下記特許文献１）。   In recent years, with the increase in electric vehicles, the number of homes where electric vehicle charging / discharging devices are installed is increasing. The electric vehicle charging / discharging device converts AC power from a commercial system into DC power and charges a storage battery of the electric vehicle. Moreover, the electric vehicle charging / discharging device can convert the DC power of the storage battery of the electric vehicle into AC power when the commercial system is stopped (at the time of power failure), and supply AC power to the load in the house. When a photovoltaic power generation system is installed in a house, the electric vehicle charging / discharging device is connected to the photovoltaic power conversion device, and the AC power input from the photovoltaic power conversion device is used for the electric vehicle. Can be charged, and AC power can be supplied to the load in the house (for example, Patent Document 1 below).

特開２０１１−１８８６０７号公報JP 2011-188607 A

しかしながら、上記従来の技術によれば、電気自動車充放電装置を介して、商用系統、電気自動車、住宅内負荷、および太陽光発電用電力変換装置と接続している場合、電気自動車充放電装置が故障すると、保守・修理等のために商用系統と電気自動車充放電装置との間の主幹漏電遮断器を開く必要がある。そのため、電気自動車充放電装置の動作を停止した場合、商用系統からの交流電力を住宅内負荷に供給できない、という問題があった。   However, according to the above-described conventional technology, when the electric vehicle charging / discharging device is connected to the commercial system, the electric vehicle, the residential load, and the photovoltaic power conversion device via the electric vehicle charging / discharging device, the electric vehicle charging / discharging device is When a failure occurs, it is necessary to open the main earth leakage breaker between the commercial system and the electric vehicle charging / discharging device for maintenance and repair. Therefore, when the operation of the electric vehicle charging / discharging device is stopped, there is a problem that AC power from the commercial system cannot be supplied to the load in the house.

本発明は、上記に鑑みてなされたものであって、電気自動車充放電装置の動作停止時において住宅内負荷へ電力の供給が可能な電力供給システムを得ることを目的とする。   This invention is made | formed in view of the above, Comprising: It aims at obtaining the electric power supply system which can supply electric power to the load in a house at the time of operation | movement stop of an electric vehicle charging / discharging apparatus.

上述した課題を解決し、目的を達成するために、本発明は、電気自動車との間で電力の充放電を行う電気自動車充放電装置と、交流電力を出力する商用系統と、住宅用分電盤と、を備えた電力供給システムであって、前記商用系統からの出力が前記電気自動車充放電装置側および前記住宅用分電盤側へ分岐された前記電気自動車充放電装置側において、前記商用系統と前記電気自動車充放電装置との接続を開閉可能な第１のスイッチと、前記住宅用分電盤に交流電力を供給する供給元として、前記商用系統または前記電気自動車充放電装置のいずれかに切り替え可能な第２のスイッチと、を備え、前記電気自動車充放電装置を動作させる正常動作時では、前記第１のスイッチを閉じ、前記第２のスイッチにおいて、前記住宅用分電盤の接続先を前記電気自動車充放電装置とし、前記商用系統から出力される前記交流電力は、前記第１のスイッチおよび前記第２のスイッチを介して、前記住宅用分電盤に入力されることを特徴とする。 In order to solve the above-described problems and achieve the object, the present invention provides an electric vehicle charging / discharging device that charges and discharges electric power with an electric vehicle, a commercial system that outputs AC power, and a residential power distribution device. A power supply system including a panel, wherein the output from the commercial system is branched to the electric vehicle charging / discharging device side and the residential distribution board side, the commercial vehicle charging / discharging device side, A first switch that can open and close a connection between a system and the electric vehicle charging / discharging device, and a supply source that supplies AC power to the residential distribution board, either the commercial system or the electric vehicle charging / discharging device A second switch that can be switched to, and during normal operation of operating the electric vehicle charging / discharging device, the first switch is closed and the second switch is connected to the residential distribution board Ahead Wherein the electric vehicle charging and discharging device, the AC power output from the commercial system, via the first switch and the second switch, and wherein the Rukoto input to the residential distribution board .

本発明によれば、電気自動車充放電装置の動作停止時において住宅内負荷へ電力を供給できる、という効果を奏する。   According to the present invention, there is an effect that electric power can be supplied to the load in the house when the operation of the electric vehicle charging / discharging device is stopped.

図１は、電力供給システムの構成例を示す図である。FIG. 1 is a diagram illustrating a configuration example of a power supply system. 図２は、正常動作時の電力供給システムの各スイッチを示す図である。FIG. 2 is a diagram illustrating each switch of the power supply system during normal operation. 図３は、商用系統から交流電力の供給が停止した停電時の電力供給システムの各スイッチを示す図である。FIG. 3 is a diagram illustrating each switch of the power supply system at the time of a power failure in which the supply of AC power from the commercial system is stopped. 図４は、ＥＶ−ＰＣＳの動作停止時の電力供給システムの各スイッチを示す図である。FIG. 4 is a diagram illustrating each switch of the power supply system when the operation of the EV-PCS is stopped.

以下に、本発明にかかる電力供給システムの実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。   Embodiments of a power supply system according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

実施の形態．
図１は本実施の形態の電力供給システムの構成例を示す図である。電力供給システムは、商用系統１と、主幹漏電遮断器２と、保守用ＭＣＣＢ（Molded Case Circuit Breaker）３と、ＥＶ−ＰＣＳ（Electric Vehicle Power Conditioning Sub-system）４と、電気自動車５と、太陽電池６と、ＰＶ−ＰＣＳ（Photo Voltaic Power Conditioning Sub-system）７と、切替開閉器８と、切替開閉器９と、住宅用分電盤１０と、を備える。 Embodiment.
FIG. 1 is a diagram illustrating a configuration example of a power supply system according to the present embodiment. The power supply system includes a commercial system 1, a main earth leakage circuit breaker 2, a maintenance MCCB (Molded Case Circuit Breaker) 3, an EV-PCS (Electric Vehicle Power Conditioning Sub-system) 4, an electric vehicle 5, A battery 6, a PV-PCS (Photo Voltage Power Conditioning Sub-system) 7, a switching switch 8, a switching switch 9, and a residential distribution board 10 are provided.

商用系統１は、ＥＶ−ＰＣＳ４および住宅用分電盤１０へ交流電力を供給可能な供給源である。   The commercial system 1 is a supply source capable of supplying AC power to the EV-PCS 4 and the residential distribution board 10.

主幹漏電遮断器２は、電力会社の商用系統１を宅内に受電するための遮断器である。   The main earth leakage circuit breaker 2 is a circuit breaker for receiving the commercial grid 1 of the electric power company in the house.

保守用ＭＣＣＢ３は、主幹漏電遮断器２からの出力がＥＶ−ＰＣＳ４側および住宅用分電盤１０側へ分岐されているＥＶ−ＰＣＳ４側に設けられた第１のスイッチである。保守用ＭＣＣＢ３は、商用系統１との連系運転（正常運転）時は閉路し、故障等によりＥＶ−ＰＣＳ４を停止して保守・修理する場合に開路して、商用系統１とＥＶ−ＰＣＳ４との接続を開く。   The maintenance MCCB 3 is a first switch provided on the EV-PCS 4 side where the output from the main earth leakage breaker 2 is branched to the EV-PCS 4 side and the residential distribution board 10 side. The maintenance MCCB 3 is closed during the interconnection operation (normal operation) with the commercial system 1, and is opened when the EV-PCS 4 is stopped for maintenance and repair due to a failure or the like, and the commercial system 1 and the EV-PCS 4 are connected. Open the connection.

ＥＶ−ＰＣＳ４は、解列用電磁接触器４１，４２と、商用系統１側への逆潮流を検出する変流器４３と、商用系統１側からの交流電力を直流電力に変換して電気自動車５の蓄電池を充電し、電気自動車５の蓄電池からの直流電力を交流電力に変換して住宅用分電盤１０側に出力する電気自動車充放電装置である電力変換器４４と、を備える。ＥＶ−ＰＣＳ４は、正常運転時において、商用系統１からの交流電力、ＰＶ−ＰＣＳ７からの交流電力を用いて、住宅用分電盤１０へ出力し、または電力変換器４４経由で電気自動車５の蓄電池を充電する。   The EV-PCS 4 converts the electromagnetic contactors 41 and 42 for disconnection, the current transformer 43 that detects the reverse power flow to the commercial system 1 side, and converts the AC power from the commercial system 1 side into DC power to an electric vehicle. And a power converter 44 that is an electric vehicle charging / discharging device that charges the storage battery 5 and converts DC power from the storage battery of the electric vehicle 5 into AC power and outputs the AC power to the residential distribution board 10 side. The EV-PCS 4 outputs to the residential distribution board 10 using the AC power from the commercial system 1 and the AC power from the PV-PCS 7 during normal operation, or via the power converter 44 of the electric vehicle 5. Charge the storage battery.

電気自動車５は、図示しない蓄電池を備えており、蓄電池にＥＶ−ＰＣＳ４の電力変換器４４から供給される直流電力を蓄電する。   The electric vehicle 5 includes a storage battery (not shown), and stores direct-current power supplied from the power converter 44 of the EV-PCS 4 in the storage battery.

太陽電池６は太陽光を用いて発電を行い、太陽光発電用電力変換装置であるＰＶ−ＰＣＳ７が、太陽電池６からの直流電力を交流電力に変換して出力する。   The solar cell 6 generates power using sunlight, and the PV-PCS 7 that is a photovoltaic power conversion device converts the DC power from the solar cell 6 into AC power and outputs it.

切替開閉器８は、ＰＶ−ＰＣＳ７が出力する交流電力の出力先を、ＥＶ−ＰＣＳ４または住宅用分電盤１０に切り替える第３のスイッチである。   The switching switch 8 is a third switch that switches the output destination of the AC power output by the PV-PCS 7 to the EV-PCS 4 or the residential distribution board 10.

切替開閉器９は、住宅用分電盤１０に交流電力を供給する供給元として、商用系統１またはＥＶ−ＰＣＳ４に切り替える第２のスイッチである。   The switch 9 is a second switch that switches to the commercial system 1 or the EV-PCS 4 as a supply source that supplies AC power to the residential distribution board 10.

住宅用分電盤１０は、主幹漏電遮断器１０１と、分岐ブレーカ１０２〜１０５と、を備え、各分岐ブレーカ１０２〜１０５の先に、交流電力を使用する住宅内負荷が接続されている。   The residential distribution board 10 includes a main earth leakage circuit breaker 101 and branch breakers 102 to 105, and an in-house load that uses AC power is connected to the ends of the branch breakers 102 to 105.

つづいて、電力供給システムの状態に応じて、保守用ＭＣＣＢ３、切替開閉器８，９等の各スイッチの切り替え処理について説明する。   Subsequently, switching processing of each switch such as the maintenance MCCB 3 and the switching switches 8 and 9 according to the state of the power supply system will be described.

まず、正常動作時について説明する。図２は、正常動作時の電力供給システムの各スイッチを示す図である。正常動作時において、電力供給システムでは、主幹漏電遮断器２を閉じ、保守用ＭＣＣＢ３を閉じ、切替開閉器８はＰＶ−ＰＣＳ７とＥＶ−ＰＣＳ４とを接続し、切替開閉器９は住宅用分電盤１０とＥＶ−ＰＣＳ４とを接続する。ＥＶ−ＰＣＳ４では、解列用電磁接触器４１，４２を閉じ、住宅用分電盤１０では、主幹漏電遮断器１０１を閉じる。   First, normal operation will be described. FIG. 2 is a diagram illustrating each switch of the power supply system during normal operation. During normal operation, in the power supply system, the main earth leakage circuit breaker 2 is closed, the maintenance MCCB 3 is closed, the switching switch 8 connects the PV-PCS 7 and the EV-PCS 4, and the switching switch 9 is the residential power distribution The board 10 and the EV-PCS 4 are connected. In the EV-PCS 4, the disconnecting electromagnetic contactors 41 and 42 are closed, and in the residential distribution board 10, the main earth leakage breaker 101 is closed.

この場合、ＥＶ−ＰＣＳ４では、商用系統１およびＰＶ−ＰＣＳ７から交流電力を入力し、住宅用分電盤１０側へ交流電力を出力する。また、ＥＶ−ＰＣＳ４では、電気自動車５が接続されているときには、商用系統１およびＰＶ−ＰＣＳ７からの交流電力を、電力変換器４４で直流電力に変換して電気自動車５の蓄電池を充電する。   In this case, in the EV-PCS 4, AC power is input from the commercial system 1 and the PV-PCS 7, and AC power is output to the residential distribution board 10 side. In the EV-PCS 4, when the electric vehicle 5 is connected, the AC power from the commercial system 1 and the PV-PCS 7 is converted into DC power by the power converter 44 to charge the storage battery of the electric vehicle 5.

つぎに、商用系統１から交流電力の供給が停止した停電時について説明する。図３は、商用系統１から交流電力の供給が停止した停電時の電力供給システムの各スイッチを示す図である。商用系統１から交流電力の供給が停止した停電時において、電力供給システムでは、保守用ＭＣＣＢ３を閉じ、切替開閉器８はＰＶ−ＰＣＳ７とＥＶ−ＰＣＳ４とを接続し、切替開閉器９は住宅用分電盤１０とＥＶ−ＰＣＳ４とを接続する。ＥＶ−ＰＣＳ４では、解列用電磁接触器４１，４２を開き、住宅用分電盤１０では、主幹漏電遮断器１０１を閉じる。   Next, a description will be given of a power failure when the supply of AC power from the commercial system 1 is stopped. FIG. 3 is a diagram illustrating each switch of the power supply system at the time of a power failure in which the supply of AC power from the commercial system 1 is stopped. At the time of a power failure when the supply of AC power from the commercial system 1 is stopped, in the power supply system, the maintenance MCCB 3 is closed, the switching switch 8 connects the PV-PCS 7 and the EV-PCS 4, and the switching switch 9 is for residential use. Distribution board 10 and EV-PCS 4 are connected. In the EV-PCS 4, the disconnection electromagnetic contactors 41 and 42 are opened, and in the residential distribution board 10, the main earth leakage breaker 101 is closed.

この場合、ＥＶ−ＰＣＳ４では、ＰＶ−ＰＣＳ７から交流電力を入力し、また、電気自動車５が接続されているときには、電力変換器４４で電気自動車５の蓄電池の直流電力を交流電力に変換して、住宅用分電盤１０側へ交流電力を出力する。また、ＥＶ−ＰＣＳ４では、ＰＶ−ＰＣＳ７から供給される交流電力が十分に大きいときは、ＰＶ−ＰＣＳ７からの交流電力を電力変換器４４で直流電力に変換して電気自動車５の蓄電池を充電してもよい。   In this case, in the EV-PCS 4, AC power is input from the PV-PCS 7, and when the electric vehicle 5 is connected, the power converter 44 converts the DC power of the storage battery of the electric vehicle 5 into AC power. The AC power is output to the residential distribution board 10 side. In the EV-PCS 4, when the AC power supplied from the PV-PCS 7 is sufficiently large, the AC power from the PV-PCS 7 is converted into DC power by the power converter 44 to charge the storage battery of the electric vehicle 5. May be.

つぎに、ＥＶ−ＰＣＳ４の故障の修理・保守点検等のため動作を停止する場合について説明する。図４は、ＥＶ−ＰＣＳ４の動作停止時の電力供給システムの各スイッチを示す図である。ＥＶ−ＰＣＳ４の動作を停止する場合、電力供給システムでは、主幹漏電遮断器２を閉じ、保守用ＭＣＣＢ３を開き、切替開閉器８はＰＶ−ＰＣＳ７と住宅用分電盤１０とを接続し、切替開閉器９は住宅用分電盤１０と商用系統１とを接続する。ＥＶ−ＰＣＳ４では、解列用電磁接触器４１，４２の開閉は規定せず、住宅用分電盤１０では、主幹漏電遮断器１０１を閉じる。また、ＥＶ−ＰＣＳ４は電気自動車５と未接続とする。   Next, a case where the operation is stopped for repair / maintenance inspection of the failure of the EV-PCS 4 will be described. FIG. 4 is a diagram illustrating each switch of the power supply system when the operation of the EV-PCS 4 is stopped. When stopping the operation of the EV-PCS 4, in the power supply system, the main leakage breaker 2 is closed and the maintenance MCCB 3 is opened, and the switching switch 8 connects the PV-PCS 7 and the residential distribution board 10 for switching. The switch 9 connects the residential distribution board 10 and the commercial system 1. In the EV-PCS 4, opening / closing of the disconnecting electromagnetic contactors 41, 42 is not defined, and the main earth leakage breaker 101 is closed in the residential distribution board 10. The EV-PCS 4 is not connected to the electric vehicle 5.

この場合、電力供給システムでは、ＥＶ−ＰＣＳ４には、商用系統１から交流電力は供給されず、ＰＶ−ＰＣＳ７から交流電力は供給されず、電気自動車５から直流電力は供給されないため、作業員は、ＥＶ−ＰＣＳ４の故障修理・保守点検等を行うことができる。また、住宅用分電盤１０には、ＥＶ−ＰＣＳ４が動作していない場合でも、商用系統１から交流電力が供給され、また、ＰＶ−ＰＣＳ７から交流電力が供給される。そのため、住宅用分電盤１０において、住宅内負荷を継続して動作させることができる。   In this case, in the power supply system, AC power is not supplied from the commercial system 1 to the EV-PCS 4, AC power is not supplied from the PV-PCS 7, and DC power is not supplied from the electric vehicle 5. EV-PCS4 can be repaired, repaired, and inspected. Moreover, even when EV-PCS 4 is not operating, AC power is supplied to commercial distribution board 10 from commercial system 1 and AC power is supplied from PV-PCS 7. Therefore, in the residential distribution board 10, the load in the house can be continuously operated.

以上説明したように、本実施の形態によれば、電力供給システムでは、保守用ＭＣＣＢ３、切替開閉器８，９を備え、ＥＶ−ＰＣＳ４の動作を停止する場合、保守用ＭＣＣＢ３および切替開閉器８，９を用いて、ＥＶ−ＰＣＳ４には電力が供給されず、住宅用分電盤１０に商用系統１およびＰＶ−ＰＣＳ７から交流電力が供給される接続とする。これによい、電力供給システムでは、ＥＶ−ＰＣＳ４の動作を停止して故障修理・保守点検等を行いつつ、住宅用分電盤１０へ交流電力を供給し続けることができる。   As described above, according to the present embodiment, the power supply system includes the maintenance MCCB 3 and the switching switches 8 and 9, and when the operation of the EV-PCS 4 is stopped, the maintenance MCCB 3 and the switching switch 8. 9, the electric power is not supplied to the EV-PCS 4, and the AC power is supplied to the residential distribution board 10 from the commercial system 1 and the PV-PCS 7. In this power supply system, it is possible to continue supplying AC power to the residential distribution board 10 while stopping the operation of the EV-PCS 4 and performing failure repair / maintenance inspection.

以上のように、本発明にかかる電力供給システムは、複数の電力供給源を持つシステムに有用であり、特に、電気自動車充放電装置を備えたシステムに適している。   As described above, the power supply system according to the present invention is useful for a system having a plurality of power supply sources, and is particularly suitable for a system including an electric vehicle charging / discharging device.

１ 商用系統、２ 主幹漏電遮断器、３ 保守用ＭＣＣＢ（第１のスイッチ）、４ ＥＶ−ＰＣＳ、５ 電気自動車、６ 太陽電池、７ ＰＶ−ＰＣＳ、８ 切替開閉器（第３のスイッチ）、９ 切替開閉器（第２のスイッチ）、１０ 住宅用分電盤。   1 commercial system, 2 main earth leakage circuit breaker, 3 MCCB for maintenance (1st switch), 4 EV-PCS, 5 electric vehicle, 6 solar cell, 7 PV-PCS, 8 switching switch (3rd switch), 9 Switching switch (second switch), 10 Residential distribution board.

Claims (4)

電気自動車との間で電力の充放電を行う電気自動車充放電装置と、交流電力を出力する商用系統と、住宅用分電盤と、を備えた電力供給システムであって、
前記商用系統からの出力が前記電気自動車充放電装置側および前記住宅用分電盤側へ分岐された前記電気自動車充放電装置側において、前記商用系統と前記電気自動車充放電装置との接続を開閉可能な第１のスイッチと、
前記住宅用分電盤に交流電力を供給する供給元として、前記商用系統または前記電気自動車充放電装置のいずれかに切り替え可能な第２のスイッチと、
を備え、
前記電気自動車充放電装置を動作させる正常動作時では、
前記第１のスイッチを閉じ、
前記第２のスイッチにおいて、前記住宅用分電盤の接続先を前記電気自動車充放電装置とし、
前記商用系統から出力される前記交流電力は、前記第１のスイッチおよび前記第２のスイッチを介して、前記住宅用分電盤に入力される、
ことを特徴とする電力供給システム。 An electric vehicle charging / discharging device that charges and discharges electric power with an electric vehicle, a commercial system that outputs AC power, and a residential distribution board,
Opening and closing the connection between the commercial system and the electric vehicle charging / discharging device on the electric vehicle charging / discharging device side where the output from the commercial system is branched to the electric vehicle charging / discharging device side and the residential distribution board side A possible first switch;
As a supply source for supplying AC power to the residential distribution board, a second switch that can be switched to either the commercial system or the electric vehicle charging / discharging device;
Equipped with a,
During normal operation of operating the electric vehicle charging / discharging device,
Close the first switch;
In the second switch, the connection point of the residential distribution board is the electric vehicle charging / discharging device,
The AC power output from the commercial system is input to the residential distribution board via the first switch and the second switch.
A power supply system characterized by that. 保守点検のため前記電気自動車充放電装置の動作を停止する場合、
前記第１のスイッチを開き、
前記第２のスイッチにおいて、前記住宅用分電盤の接続先を前記商用系統とする、
ことを特徴とする請求項１に記載の電力供給システム。 When stopping the operation of the electric vehicle charging / discharging device for maintenance inspection ,
Open the first switch,
In the second switch, the residential distribution board is connected to the commercial system.
The power supply system according to claim 1 . さらに、太陽電池で発電された電力を変換する太陽光発電用電力変換装置を備える場合に、
前記太陽光発電用電力変換装置が出力する交流電力の出力先として、前記住宅用分電盤または前記電気自動車充放電装置のいずれかに切り替え可能な第３のスイッチ、
を備えることを特徴とする請求項１または２に記載の電力供給システム。 Furthermore, in the case of providing a solar power generation power conversion device that converts the power generated by the solar cell,
A third switch that can be switched to either the residential distribution board or the electric vehicle charging / discharging device as an output destination of the AC power output by the photovoltaic power conversion device,
Power supply system according to claim 1 or 2, characterized in that it comprises a. 保守点検のため前記電気自動車充放電装置の動作を停止する場合、
前記第３のスイッチにおいて、前記太陽光発電用電力変換装置の接続先を前記住宅用分電盤とする、
ことを特徴とする請求項３に記載の電力供給システム。 When stopping the operation of the electric vehicle charging / discharging device for maintenance inspection ,
In the third switch, the connection destination of the photovoltaic power conversion device is the residential distribution board.
The power supply system according to claim 3 .
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