JP2005065480A - Charging method for power storage system - Google Patents

Charging method for power storage system Download PDF

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JP2005065480A
JP2005065480A JP2004147990A JP2004147990A JP2005065480A JP 2005065480 A JP2005065480 A JP 2005065480A JP 2004147990 A JP2004147990 A JP 2004147990A JP 2004147990 A JP2004147990 A JP 2004147990A JP 2005065480 A JP2005065480 A JP 2005065480A
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power
charging
storage battery
value
storage system
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Susumu Hara
享 原
Yukio Yamada
幸生 山田
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Resonac Corp
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Shin Kobe Electric Machinery Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a charging method for a power storage system using a multistage charging system, capable of charging a battery 5 within a range which does not exceed the contract power, even in the nighttime when the battery is charged and a power charge rate is low. <P>SOLUTION: This charging method includes a system in which at nighttime, the battery 5 charges power, from a commercial power supply 1 in multi-stage format using a bidirectional converter 4, while decreasing a charging power value stepwise, and in the daytime when power is demanded, the power from the battery 5 is supplied to a load 2 using the bidirectional converter 4. The total consumed power (W) from the commercial power supply 1 is measured at nighttime, when the battery 5 is charged. When the total consumed power (W) from the power supply 1 exceeds a threshold set established within the contact power, the bidirectional converter 4 is controlled so as to perform charging, while lowering the charging power value by one level; and at this time, the threshold set at nighttime is made variable, corresponding to a value discharged in daytime. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、電力貯蔵システムの充電方式に関するものである。   The present invention relates to a charging method for an electric power storage system.

最近、蓄電池を用いた電力貯蔵システムの開発が進められている。この電力貯蔵システムは、夜間の安価な余剰電力を蓄電池に蓄えておき、昼間の電力需要時に前記蓄電池を放電させて電力を供給する、いわゆるピークカットを行うシステムである（例えば、特許文献１参照。）。   Recently, power storage systems using storage batteries have been developed. This power storage system is a system that performs so-called peak cut in which inexpensive surplus power at night is stored in a storage battery, and power is supplied by discharging the storage battery during daytime power demand (see, for example, Patent Document 1). .)

図４は、従来から使用されている電力貯蔵システムのブロック図である。すなわち、電力計6、ブレーカ3、双方向コンバータ4、蓄電池5、コントロール回路9、電圧計10及び充電制御テーブル11などで構成されている。そして、電力貯蔵システムは商用電源1と負荷2とに接続されている。   FIG. 4 is a block diagram of a power storage system conventionally used. That is, the power meter 6, the breaker 3, the bidirectional converter 4, the storage battery 5, the control circuit 9, the voltmeter 10, and the charge control table 11 are configured. The power storage system is connected to the commercial power source 1 and the load 2.

ブレーカ3とは、短絡などによって、双方向コンバータ4に過電流が流れた場合に電流を遮断する装置である。双方向コンバータ4とは、夜間の余剰電力を蓄電池5に定電力で充電をするための充電器としての役割と、昼間の電力需要時には蓄電池5を放電させて、インバータとして交流を生成して負荷2が消費する電力の一部を供給する装置である。なお、蓄電池5には、安価な鉛蓄電池が一般的に使用されている。   The breaker 3 is a device that interrupts current when an overcurrent flows through the bidirectional converter 4 due to a short circuit or the like. The bidirectional converter 4 functions as a charger for charging the surplus power at night to the storage battery 5 with constant power, and discharges the storage battery 5 during daytime power demand to generate alternating current as an inverter and load 2 is a device that supplies part of the power consumed. As the storage battery 5, an inexpensive lead storage battery is generally used.

コントロール回路9とは、双方向コンバータ4の動作を制御する装置である。すなわち、夜間においてコントロール回路9は、商用電源1からの電力を、双方向コンバータ4を充電器として作動させて蓄電池5を充電するように制御する。なお、鉛蓄電池などの蓄電池5の充電は、電力料金の安い、夜間に行われるのが一般的である。   The control circuit 9 is a device that controls the operation of the bidirectional converter 4. That is, at night, the control circuit 9 controls the electric power from the commercial power source 1 so as to charge the storage battery 5 by operating the bidirectional converter 4 as a charger. In general, charging of the storage battery 5 such as a lead storage battery is performed at night when the power charge is low.

一方、昼間の電力需要時においてコントロール回路9は、蓄電池5からの直流を、双方向コンバータ4を作動させて交流電力に変換して、負荷2が消費する電力の一部を供給するように制御する。   On the other hand, during the daytime power demand, the control circuit 9 controls the direct current from the storage battery 5 to convert the direct current from the storage battery 5 into alternating current power by operating the bidirectional converter 4, and supply a part of the power consumed by the load 2. To do.

ここで、鉛蓄電池などの蓄電池5を充電するには、短時間で充電が可能なこと、制御が容易なこと、及び、装置の低コスト化などの理由から、図２に示すように、定電力で段階的に充電電力値を下げながら充電をする手法が一般的に用いられている（例えば、特許文献２参照。）。すなわち、図２において充電初期には比較的大きな電力値で充電し（１段目と記載。）、充電によって蓄電池5の電圧が設定電圧（一例として、２．４２Ｖ／セルと記載。）に達すると、充電時の電力値を段階的に下げていき、必要に応じて、最後に定電圧で充電をする充電方式である（２段目〜４段目と記載。以下において、この充電方式を多段充電方式と呼ぶ。）。   Here, in order to charge the storage battery 5 such as a lead storage battery, as shown in FIG. 2, it is possible to charge the battery in a short time, to facilitate control, and to reduce the cost of the apparatus. A method of charging while gradually reducing the charging power value with electric power is generally used (see, for example, Patent Document 2). That is, in FIG. 2, charging is performed at a relatively large power value in the initial stage of charging (described as the first stage), and the voltage of the storage battery 5 reaches a set voltage (described as 2.42 V / cell as an example) by charging. Then, the power value at the time of charging is lowered step by step, and if necessary, charging is performed at a constant voltage at the end (described as the second to fourth stages. In the following, this charging method is referred to as This is called a multistage charging method.)

特開２００２−２８１６９３号公報JP 2002-281893 A 特願２００２−２３７７４２号公報Japanese Patent Application No. 2002-237742

しかしながら、図２に示すように、充電初期には比較的大きな電力値で充電をしているために、負荷2（図４）の消費電力が増加した場合には、全消費電力（負荷2の消費電力及び電力貯蔵システムが消費する充電電力の合計値）が、契約電力である「しきい値」を超えてしまう場合が認められた（図２で「問題点」と記載した。）。なお、契約電力を超えた電力で使用を続けるには、電力会社に基本料金を多く支払をなければならないという問題点がある。   However, as shown in FIG. 2, since charging is performed at a relatively large power value in the initial stage of charging, when the power consumption of the load 2 (FIG. 4) increases, the total power consumption (of the load 2) It was recognized that the total power consumption and the charging power consumed by the power storage system) exceeded the “threshold value” that is the contract power (described as “problem” in FIG. 2). In addition, there is a problem that in order to continue using the power exceeding the contracted power, a large amount of basic charges must be paid to the power company.

本発明の目的は、制御が容易なこと等から多段充電方式を用いるとともに、蓄電池5の充電が行われる電力料金の安価な夜間においても、契約電力を超えない電力貯蔵システムの充電方式を提供することである。   An object of the present invention is to provide a charging method for a power storage system that does not exceed the contract power even at night when the charging of the storage battery 5 is performed at an inexpensive power charge while using a multi-stage charging method because control is easy. That is.

上記した課題を解決するために、本発明に係わる電力貯蔵システムは、制御の容易さ、及び、装置の低コスト化等に優れた多段充電方式を用いている。そして、本発明に係わる電力貯蔵システムでは、商用電源からの全消費電力を電力計によって測定し、電力演算部で演算して数値化する。そして、電力演算部によって演算された全消費電力が、契約電力のしきい値を超えた場合には、充電電力値を１段落とすようにして、全消費電力が契約電力のしきい値を超えないように制御する方式である。   In order to solve the above-described problems, the power storage system according to the present invention uses a multi-stage charging system that is excellent in ease of control and cost reduction of the device. In the power storage system according to the present invention, the total power consumption from the commercial power source is measured with a wattmeter, and is calculated and digitized by the power calculation unit. When the total power consumption calculated by the power calculation unit exceeds the contract power threshold, the charging power value is set to one paragraph, and the total power consumption exceeds the contract power threshold. This is a method of controlling so that there is no.

さらに、複数のしきい値を設定できるようにした。そして、昼間の放電量が多い場合には、しきい値を高く設定し、昼間の放電量が少ない場合には、しきい値を低く設定するようにしたものである。   In addition, multiple thresholds can be set. When the daytime discharge amount is large, the threshold value is set high, and when the daytime discharge amount is small, the threshold value is set low.

すなわち、請求項１の発明は、昼間の電力需要時には蓄電池からの電力を双方向コンバータを用いて負荷に供給する方式を備え、夜間には商用電源からの電力を前記双方向コンバータを用いて前記蓄電池に段階的に充電電力値を少なくしながら充電をする多段充電方式を備えた電力貯蔵システムの充電方式において、契約電力量の範囲内でしきい値を設定し、夜間の充電時に前記商用電源の全消費電力を測定し、該全消費電力値が前記しきい値を超えている場合には、前記充電電力値を一段下げるように、前記双方向コンバータを制御することを特徴としている。   That is, the invention of claim 1 includes a method of supplying power from a storage battery to a load using a bidirectional converter during daytime power demand, and using power from a commercial power source at night using the bidirectional converter. In a charging system of a power storage system having a multi-stage charging system that charges the storage battery while gradually reducing the charging power value, a threshold value is set within the contracted electric energy range, and the commercial power source is charged at night When the total power consumption value exceeds the threshold value, the bidirectional converter is controlled so as to lower the charging power value by one step.

請求項２の発明は、請求項１の発明において、前記多段充電方式で充電をした後に、定電圧で前記蓄電池を充電することを特徴としている。   The invention of claim 2 is characterized in that, in the invention of claim 1, the storage battery is charged at a constant voltage after being charged by the multistage charging method.

請求項３の発明は、昼間の電力需要時には蓄電池からの電力を双方向コンバータを用いて負荷に供給する方式を備え、夜間には商用電源からの電力を前記双方向コンバータを用いて前記蓄電池に段階的に充電電力値を少なくしながら充電をする多段充電方式を備えた電力貯蔵システムの充電方式において、契約電力量の範囲内で複数のしきい値を設定することができ、昼間の前記蓄電池の放電量を測定して、該放電量が多い場合には、前記しきい値を高く設定し、前記放電量が少ない場合には、前記しきい値を低く設定し、夜間の充電時に前記商用電源の全消費電力を測定し、該全消費電力値が前記しきい値を超えている場合には、前記充電電力値を一段下げるように、前記双方向コンバータを制御することを特徴としている。   According to a third aspect of the present invention, there is provided a system for supplying power from a storage battery to a load by using a bidirectional converter at the time of daytime power demand, and power from a commercial power source to the storage battery by using the bidirectional converter at night. In a charging system of a power storage system having a multi-stage charging system that performs charging while gradually reducing the charging power value, a plurality of threshold values can be set within a contract power amount range, and the storage battery in the daytime When the discharge amount is large, the threshold value is set high. When the discharge amount is small, the threshold value is set low. The bi-directional converter is controlled so that the total power consumption of the power source is measured and, when the total power consumption value exceeds the threshold value, the charging power value is lowered by one step.

請求項４の発明は、請求項３の発明において、前記多段充電方式で充電をした後に、定電圧で前記蓄電池を充電することを特徴としている。   The invention of claim 4 is characterized in that, in the invention of claim 3, the storage battery is charged with a constant voltage after being charged by the multistage charging method.

上述したように、本発明に係わる電力貯蔵システムを用いることにより、鉛蓄電池などの蓄電池5の充電が行われる電力料金の安い夜間において、多段充電方式を用いることができるとともに、契約電力を超えない電力貯蔵システムの充電方式を提供できる。   As described above, by using the power storage system according to the present invention, the multistage charging method can be used at night when the power charge of the storage battery 5 such as a lead storage battery is low, and the contract power is not exceeded. A charging method for a power storage system can be provided.

そして、本発明に係わる電力貯蔵システムは、夜間における負荷の消費電力の変動が大きく、契約電力に余裕がないような場合にも適用することができる。   The power storage system according to the present invention can also be applied to a case where there is a large fluctuation in load power consumption at night and there is no margin in contract power.

加えて、昼間の蓄電池の放電量に応じて、夜間の充電条件を変更でき、適正な充電ができるようにしたものである。   In addition, according to the amount of discharge of the storage battery in the daytime, the nighttime charging conditions can be changed to allow proper charging.

本発明に係わる電力貯蔵システムについて図３を用いて詳細に説明する。   The power storage system according to the present invention will be described in detail with reference to FIG.

図３は、本発明に係わる電力貯蔵システムのブロック図である。すなわち、電力計6、ブレーカ3、双方向コンバータ4、蓄電池5、電力演算部7、しきい値判断部8及びコントロール回路9、電圧計10、充電制御テーブル11で構成されている。そして、本発明に係わる電力貯蔵システムは商用電源1、負荷2に接続されている。   FIG. 3 is a block diagram of a power storage system according to the present invention. That is, the power meter 6, the breaker 3, the bidirectional converter 4, the storage battery 5, the power calculation unit 7, the threshold value determination unit 8 and the control circuit 9, the voltmeter 10, and the charge control table 11 are configured. The power storage system according to the present invention is connected to a commercial power source 1 and a load 2.

ブレーカ3とは、双方向コンバータ4に過電流が流れた場合に、安全性を確保するために電流を遮断するものである。双方向コンバータ4とは、夜間の余剰電力を蓄電池5に定電力で充電をするための充電器としての役割と、昼間の電力需要時には蓄電池5を放電させてインバータとして交流を生成して負荷2が消費する電力の一部を供給する装置である。なお、蓄電池5には、安価で取り扱いが容易な制御弁式鉛蓄電池が一般的に使用されている。   The breaker 3 cuts off the current in order to ensure safety when an overcurrent flows through the bidirectional converter 4. The bidirectional converter 4 has a role as a charger for charging the surplus power at night to the storage battery 5 with constant power, and generates an alternating current as an inverter by discharging the storage battery 5 during the daytime power demand. Is a device that supplies a part of the power consumed by. The storage battery 5 is generally a control valve type lead storage battery that is inexpensive and easy to handle.

コントロール回路9とは、双方向コンバータ4の動作を制御する装置である。すなわち、夜間においてコントロール回路9は、商用電源1からの電力を、双方向コンバータ4を充電器として作動させて蓄電池5を定電力で充電をするように制御する。なお、鉛蓄電池などの蓄電池5の充電は、電力料金の安い、夜間に行われるのが一般的である。   The control circuit 9 is a device that controls the operation of the bidirectional converter 4. That is, at night, the control circuit 9 controls the power from the commercial power source 1 so that the storage battery 5 is charged with constant power by operating the bidirectional converter 4 as a charger. In general, charging of the storage battery 5 such as a lead storage battery is performed at night when the power charge is low.

一方、昼間の電力需要時においてコントロール回路9は、蓄電池5からの直流を、双方向コンバータ4を作動させて交流電力に変換して、負荷2が消費する電力の一部を供給するように制御する。   On the other hand, during the daytime power demand, the control circuit 9 controls the direct current from the storage battery 5 to convert the direct current from the storage battery 5 into alternating current power by operating the bidirectional converter 4, and supply a part of the power consumed by the load 2. To do.

電力演算部7では、電力計6で測定された全消費電力値を演算して数値化する。数値化された全消費電力値は、しきい値判断部8によって、契約電力の範囲内にあるか否かが判断される。そして、全消費電力値が契約電力の範囲内のしきい値を超えている場合には、その旨をコントロール回路9に出力する。コントロール回路9では、充電制御テーブル11にストアされている充電電力値や、後述する設定電圧のデータを用いて双方向コンバータ4を制御する。   The power calculation unit 7 calculates and digitizes the total power consumption value measured by the wattmeter 6. The threshold value determining unit 8 determines whether the digitized total power consumption value is within the contract power range. When the total power consumption value exceeds the threshold value within the contract power range, the fact is output to the control circuit 9. The control circuit 9 controls the bidirectional converter 4 using the charging power value stored in the charging control table 11 and the data of the set voltage described later.

以下に、本発明に係わる電力貯蔵システム及びその動作状況について、図１（実施例１）および図５（実施例２）を用いてより詳細に説明する。   Hereinafter, the power storage system and the operation status thereof according to the present invention will be described in more detail with reference to FIG. 1 (Embodiment 1) and FIG. 5 (Embodiment 2).

（実施例１）
鉛蓄電池などの蓄電池5を充電するには、短時間で充電が可能なこと、充電制御の容易さ、及び、装置の低コスト化などの理由から、図１に示すように、定電力で段階的に充電電力値を下げながら充電をする多段充電方式が一般的に用いられている。 (Example 1)
In order to charge the storage battery 5 such as a lead storage battery, it is possible to charge in a short time, the ease of charge control, and the cost reduction of the device, etc. In general, a multistage charging method in which charging is performed while lowering the charging power value is generally used.

すなわち、通常は、充電初期には比較的大きな電力値で充電し（図１において、１段目と記載した。）、蓄電池の電圧が設定電圧（図１において、一例として、２．４２Ｖ／セルと記載した。）に達すると、充電時の電力値を段階的に下げていき、必要に応じて、最後に定電圧で充電をする多段充電方式を用いた。なお、最後に定電圧で充電をすることによって、充電不足による鉛蓄電池、特に、サルフェーションによる制御弁式鉛蓄電池の短寿命化を防止することができる。ここで、充電時の電力値や設定電圧は、上述したように、あらかじめ充電制御テーブル11（図３）にストアされているデータを用いて制御するようにした。そして、これらのデータは、充放電等の状況に応じて自由に変更ができるようにした。   That is, normally, charging is performed at a relatively large power value in the initial stage of charging (described as the first stage in FIG. 1), and the voltage of the storage battery is set to a set voltage (in FIG. 1, as an example, 2.42 V / cell). ), The multi-stage charging method was used in which the power value during charging was lowered stepwise, and finally charged at a constant voltage as needed. Finally, by charging at a constant voltage, it is possible to prevent the lead-acid battery due to insufficient charging, particularly the control valve-type lead-acid battery due to sulfation, from being shortened. Here, as described above, the power value and set voltage during charging are controlled using data stored in the charge control table 11 (FIG. 3) in advance. These data can be freely changed according to the situation such as charge / discharge.

電力演算部7では、電力計6で測定された負荷2及び双方向コンバータ4等が消費する全消費電力値を数値化する。数値化された全消費電力値は、しきい値判断部8によって、契約電力の範囲内であり、かつ、しきい値の範囲内にあるか否かが判断される。そして、しきい値の範囲を超えている場合には、その旨をコントロール回路9に出力する。コントロール回路9では、全消費電力値がしきい値を超えている場合には、充電制御テーブル11にストアされている充電電力値を現在よりも一段下げるように、双方向コンバータ4を制御する。   The power calculation unit 7 quantifies the total power consumption value consumed by the load 2, the bidirectional converter 4 and the like measured by the power meter 6. The digitized total power consumption value is determined by the threshold value determination unit 8 within the contract power range and whether it is within the threshold value range. If it exceeds the threshold range, a message to that effect is output to the control circuit 9. In the control circuit 9, when the total power consumption value exceeds the threshold value, the bidirectional converter 4 is controlled so that the charging power value stored in the charging control table 11 is lowered by one step from the current level.

したがって、図１に示すように、充電時の電圧が設定電圧（図１では、２．４２Ｖ／セルと記載。）に達していないような場合でも、全消費電力値がしきい値に達した場合には、充電電力値を一段下げることによって、全消費電力値はしきい値以下に抑えることができる。   Therefore, as shown in FIG. 1, even when the voltage during charging does not reach the set voltage (indicated as 2.42 V / cell in FIG. 1), the total power consumption value reaches the threshold value. In some cases, the total power consumption value can be kept below a threshold value by lowering the charging power value by one step.

同様に、図１において示されてはいないが、充電電力値を一段下げた状態（２段目）でも、全消費電力値が、しきい値を超えているような場合には、さらに充電電力を下げた状態（３段目又は４段目）で充電ができるようにした。   Similarly, although not shown in FIG. 1, even when the charging power value is lowered by one stage (second stage), if the total power consumption value exceeds the threshold value, the charging power is further increased. The battery can be charged in a state where the battery is lowered (3rd stage or 4th stage).

すなわち、本発明に係わる電力貯蔵システムでは、夜間の充電方式として多段充電方式を用い、商用電源1からの全消費電力を電力計6によって測定し、その値を電力演算部7によって演算して数値化する。そして、電力演算部7によって演算された全消費電力が、負荷2の消費電力の増加等によって契約電力のしきい値を超えた場合には、充電電力値を１段下げるようにして、全消費電力が契約電力の範囲内のしきい値を超えないように制御するようにした。   That is, in the power storage system according to the present invention, the multistage charging method is used as the nighttime charging method, the total power consumption from the commercial power source 1 is measured by the wattmeter 6, and the value is calculated by the power calculation unit 7 to obtain a numerical value. Turn into. When the total power consumption calculated by the power calculation unit 7 exceeds the contract power threshold due to an increase in the power consumption of the load 2, etc., the charging power value is lowered by one step to reduce the total power consumption. Control was made so that the power does not exceed the threshold value within the contract power range.

（実施例２）
実施例２では、実施例１の「しきい値」を、２段階に設定できるようにしたものである（図５）。ここで、「しきい値」を「契約電力」に近い値にすると、何らかの状況によって負荷2の消費電力が急激に増加すると、コントロール回路9による双方向コンバータ4の制御が追いつかず、全消費電力（Ｗ）が「契約電力」を超えてしまう場合も起こり得る。そこで、通常は「しきい値」を「契約電力」に対して余裕のあるように低めの値に設定をする（図５では、「しきい値１」と記載した。）。すなわち、通常は「しきい値１」で充電制御がされるために、負荷2の消費電力が急激に増加しても全消費電力（Ｗ）が「契約電力」を超えることはない。 (Example 2)
In the second embodiment, the “threshold value” in the first embodiment can be set in two stages (FIG. 5). Here, if the “threshold value” is set to a value close to “contract power”, if the power consumption of the load 2 suddenly increases due to some situation, the control of the bidirectional converter 4 by the control circuit 9 cannot catch up, and the total power consumption There may be a case where (W) exceeds “contract power”. Therefore, normally, the “threshold value” is set to a low value so that there is room for “contract power” (in FIG. 5, “threshold value 1” is described). That is, since charging control is normally performed at “threshold value 1”, even if the power consumption of the load 2 increases rapidly, the total power consumption (W) does not exceed “contract power”.

なお、昼間の電力使用料金は、夜間の電力使用料金に比べて高価である。そして、昼間に、通常よりも多くの電力量を、電力貯蔵システムから負荷2に供給したいような事態も起こる。すなわち、昼間の電力需要時の消費電力量が異常に大きくなったような場合には、電力貯蔵システムの蓄電池5の放電量を標準的な設計値よりも大きくしたい場合が生ずる。このような場合には、蓄電池5は昼間に深い放電がされることになり、その結果、夜間には、通常よりも充電量を多くする必要がある。   The daytime power usage fee is more expensive than the nighttime power usage fee. In the daytime, a situation occurs in which a larger amount of power than usual is desired to be supplied from the power storage system to the load 2. That is, when the amount of power consumption during daytime power demand is abnormally large, there is a case where the amount of discharge of the storage battery 5 of the power storage system is desired to be larger than the standard design value. In such a case, the storage battery 5 is deeply discharged in the daytime. As a result, it is necessary to increase the charge amount more than usual at night.

そこで、上記したように、電力貯蔵システムの蓄電池5の放電量が、標準的な設計値よりも大きくなったような場合には、通常使用している「しきい値１」よりも大きくして、「契約電力」に近い値に設定するようにした（図５では、「しきい値２」と記載した。）。   Therefore, as described above, when the discharge amount of the storage battery 5 of the power storage system becomes larger than the standard design value, it is set larger than the “threshold value 1” that is normally used. The value is set to a value close to “contract power” (in FIG. 5, “threshold value 2” is described).

すなわち、昼間の蓄電池5の放電量が多い場合には、「しきい値２」で制御される。そして、夜間に負荷2の消費電力が大きくなった場合でも、全消費電力（Ｗ）が「しきい値２」を超えるような場合はめったに起こらず、大電力のままで蓄電池5の充電をすることができる。したがって、夜間の限られた時間内でも、電力貯蔵システムの蓄電池5を十分に充電をすることができる。一方、「しきい値１」のままで蓄電池5の充電をすると、（実施例１）で説明したように、全消費電力をその範囲内に制御するために、段階的に充電電力値を下げて充電がされて、夜間の限られた時間内では充電不足となるような事態も起こり得る。   That is, when the amount of discharge of the storage battery 5 in the daytime is large, the threshold value 2 is controlled. Even when the power consumption of the load 2 becomes large at night, it rarely occurs when the total power consumption (W) exceeds the “threshold value 2”, and the storage battery 5 is charged with the high power remaining as it is. be able to. Therefore, the storage battery 5 of the power storage system can be sufficiently charged even during a limited time at night. On the other hand, when the storage battery 5 is charged with the “threshold value 1” as it is, as described in the first embodiment, in order to control the total power consumption within the range, the charging power value is lowered step by step. There is a possibility that the battery will be charged and the battery will become insufficiently charged within a limited time at night.

すなわち、本発明に係わる電力貯蔵システムでは、上述した実施例１の内容に加えて、昼間の蓄電池5の放電量に応じ、夜間の充電時における契約電力の範囲内のしきい値を変えて、適正な充電ができるようにしたものである。   That is, in the power storage system according to the present invention, in addition to the contents of Example 1 described above, according to the amount of discharge of the storage battery 5 during the day, the threshold within the range of the contract power at the time of charging at night is changed, Appropriate charging is possible.

なお、実施例２では、しきい値を２段階に設定できる例を示している。しかし、昼間の蓄電池5の放電量、「契約電力」に対しての余裕度、電力貯蔵システムのしきい値判断部8の応答速度、負荷8の消費電力変動状況などから、しきい値の値を３段階または４段階に設定が可能にすることもできる。   In the second embodiment, an example in which the threshold value can be set in two stages is shown. However, the threshold value is calculated based on the amount of discharge of the storage battery 5 in the daytime, the margin for "contract power", the response speed of the threshold judgment unit 8 of the power storage system, the power consumption fluctuation status of the load 8, etc. Can be set in three or four stages.

本発明に係わる充電制御方式は、夜間の安価な余剰電力を蓄電池に蓄えておき、昼間の電力需要時に蓄電池を放電させて電力を供給する電力貯蔵システムに用いることができる。   The charge control system according to the present invention can be used in a power storage system that stores cheap surplus power at night in a storage battery, and discharges the storage battery during the daytime power demand to supply power.

実施例１に示す本発明に係わる電力貯蔵システムの動作状況を示す概略図である。It is the schematic which shows the operation | movement condition of the power storage system concerning this invention shown in Example 1. FIG. 従来の電力貯蔵システムの動作状況を示す概略図である。It is the schematic which shows the operation | movement condition of the conventional electric power storage system. 本発明に係わる電力貯蔵システムのブロック図である。It is a block diagram of the electric power storage system concerning this invention. 従来の電力貯蔵システムのブロック図である。It is a block diagram of the conventional power storage system. 実施例２に示す本発明に係わる電力貯蔵システムの動作状況を示す概略図である。It is the schematic which shows the operation | movement condition of the electric power storage system concerning this invention shown in Example 2. FIG.

符号の説明Explanation of symbols

１：商用電源、２：負荷、３：ブレーカ、４：双方向コンバータ、５：蓄電池、
６：電力計、７：電力演算部、８：しきい値判断部、９：コントロール回路、
１０：電圧計、１１：充電制御テーブル 1: commercial power supply, 2: load, 3: breaker, 4: bidirectional converter, 5: storage battery,
6: Wattmeter, 7: Power calculation unit, 8: Threshold judgment unit, 9: Control circuit,
10: Voltmeter, 11: Charge control table

Claims (4)

昼間の電力需要時には蓄電池からの電力を双方向コンバータを用いて負荷に供給する方式を備え、夜間には商用電源からの電力を前記双方向コンバータを用いて前記蓄電池に段階的に充電電力値を少なくしながら充電をする多段充電方式を備えた電力貯蔵システムの充電方式において、
契約電力量の範囲内でしきい値を設定し、
夜間の充電時に前記商用電源の全消費電力を測定し、該全消費電力値が前記しきい値を超えている場合には、前記充電電力値を一段下げるように、前記双方向コンバータを制御することを特徴とする電力貯蔵システムの充電方式。 It is equipped with a method of supplying power from a storage battery to a load using a bidirectional converter during daytime power demand, and charging power value from the commercial power source to the storage battery stepwise using the bidirectional converter In the charging method of the power storage system with the multistage charging method that charges while reducing,
Set a threshold value within the contracted energy range,
The total power consumption of the commercial power supply is measured during nighttime charging, and when the total power consumption value exceeds the threshold value, the bidirectional converter is controlled so as to lower the charging power value by one step. A charging method for a power storage system. 前記多段充電方式で充電をした後に、定電圧で前記蓄電池を充電することを特徴とする請求項１に記載の電力貯蔵システムの充電方式。 The charging method for the power storage system according to claim 1, wherein the storage battery is charged with a constant voltage after being charged with the multistage charging method. 昼間の電力需要時には蓄電池からの電力を双方向コンバータを用いて負荷に供給する方式を備え、夜間には商用電源からの電力を前記双方向コンバータを用いて前記蓄電池に段階的に充電電力値を少なくしながら充電をする多段充電方式を備えた電力貯蔵システムの充電方式において、
契約電力量の範囲内で複数のしきい値を設定することができ、
昼間の前記蓄電池の放電量を測定して、該放電量が多い場合には、前記しきい値を高く設定し、
前記放電量が少ない場合には、前記しきい値を低く設定し、
夜間の充電時に前記商用電源の全消費電力を測定し、該全消費電力値が前記しきい値を超えている場合には、前記充電電力値を一段下げるように、前記双方向コンバータを制御することを特徴とする電力貯蔵システムの充電方式。 It is equipped with a method of supplying power from a storage battery to a load using a bidirectional converter during daytime power demand, and charging power value from the commercial power source to the storage battery stepwise using the bidirectional converter In the charging method of the power storage system with the multistage charging method that charges while reducing,
Multiple thresholds can be set within the contracted energy range,
Measure the amount of discharge of the storage battery in the daytime, if the amount of discharge is large, set the threshold high,
If the amount of discharge is small, set the threshold low,
The total power consumption of the commercial power supply is measured during charging at night, and when the total power consumption value exceeds the threshold value, the bidirectional converter is controlled to lower the charging power value by one step. A charging method for a power storage system. 前記多段充電方式で充電をした後に、定電圧で前記蓄電池を充電することを特徴とする請求項３に記載の電力貯蔵システムの充電方式。 The charging method for the power storage system according to claim 3, wherein the storage battery is charged with a constant voltage after being charged with the multistage charging method.
JP2004147990A 2003-07-29 2004-05-18 Charging method for power storage system Abandoned JP2005065480A (en)

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