JP2000175360A - Inverse power flow method of power storing system - Google Patents

Inverse power flow method of power storing system

Info

Publication number
JP2000175360A
JP2000175360A JP10343274A JP34327498A JP2000175360A JP 2000175360 A JP2000175360 A JP 2000175360A JP 10343274 A JP10343274 A JP 10343274A JP 34327498 A JP34327498 A JP 34327498A JP 2000175360 A JP2000175360 A JP 2000175360A
Authority
JP
Japan
Prior art keywords
power
battery
load
flow
information
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Withdrawn
Application number
JP10343274A
Other languages
Japanese (ja)
Inventor
Tomoshi Tada
知史 多田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissin Electric Co Ltd
Original Assignee
Nissin Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nissin Electric Co Ltd filed Critical Nissin Electric Co Ltd
Priority to JP10343274A priority Critical patent/JP2000175360A/en
Publication of JP2000175360A publication Critical patent/JP2000175360A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Landscapes

  • Supply And Distribution Of Alternating Current (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To realize the leveling of power by restraining power change and voltage change. SOLUTION: This power storing system is equipped with a battery for storing electric power which is connected with a power system via a converter which system interconnects dispersed power sources containing wind power generation with a commercial power source system, and performs the leveling of power by supplying the power stored in the battery to a load. This inverse power flow method turns generated power of the dispersed power sources and various kinds of information containing weather information and load information into a data base, turns inverse power flow PS to the commercial power source system into a pattern on the basis of the various kinds of information, calculates charge and discharge power PB of the battery from the patterned inverse power flow PS and the generated power PG of the dispersed power sources, charges the battery with the generated power PG of the dispersed power sources in a light load time zone containing night, discharges the stored power of the battery in a heavy load time zone containing daytime, and makes power matched with a load power flow inversely to the commercial power source system.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は電力貯蔵システムの
逆潮流方法に関し、例えば風力発電システム等を商用電
源系統に連系させた電力系統において、バッテリーの充
放電により負荷電力の平準化を実現する電力貯蔵システ
ムの逆潮流方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverse power flow method for an electric power storage system, for example, in a power system in which a wind power generation system or the like is connected to a commercial power system, the load power is leveled by charging and discharging a battery. The present invention relates to a reverse flow method for an electric power storage system.

【0002】[0002]

【従来の技術】例えば、図4に示すように風力発電シス
テムや小水力発電システム等のような発電システムを含
む分散電源1を、電力会社が持つ商用電源系統(以下、
単に電源系統と称す)2に連系させた電力系統では、電
源系統2による発電電力を負荷3に供給すると共に分散
電源1による発電電力も負荷3に供給するようにしてい
る。さらに、分散電源1による余剰の発電電力を電源系
統2に逆潮流するようにしている。
2. Description of the Related Art For example, as shown in FIG. 4, a distributed power supply 1 including a power generation system such as a wind power generation system or a small hydro power generation system is connected to a commercial power supply system (hereinafter, referred to as a power supply system) owned by a power company.
In a power system interconnected with the power system 2, power generated by the power system 2 is supplied to the load 3 and power generated by the distributed power source 1 is also supplied to the load 3. Further, surplus power generated by the distributed power source 1 is caused to flow backward to the power source system 2.

【0003】[0003]

【発明が解決しようとする課題】ところで、前述したよ
うな風力発電システムを分散電源1とした場合、風力発
電システムの発電電力は、図5に示すように風速に応じ
て時々刻々と変化するため、このように変動が大きい発
電電力が電源系統2に逆潮流されると、電源系統2の出
力電力が一定でなくなり大きく変動する。このような分
散電源1の電力変動があると、電源系統側の電力変動や
電圧周波数変動を招来することになり望ましくない。
When the above-mentioned wind power generation system is used as the distributed power source 1, the power generated by the wind power generation system changes every moment according to the wind speed as shown in FIG. When the generated power having such a large fluctuation flows backward to the power supply system 2, the output power of the power supply system 2 is not constant and varies greatly. Such power fluctuations of the distributed power supply 1 cause power fluctuations and voltage frequency fluctuations on the power supply system side, which is not desirable.

【0004】そこで、本発明は前述した問題点に鑑みて
提案されたもので、その目的とするところは、電力変動
や電圧変動などを抑制して電力の平準化を実現し得る電
力貯蔵システムの逆潮流方法を提供することにある。
Therefore, the present invention has been proposed in view of the above-mentioned problems, and an object of the present invention is to provide a power storage system capable of suppressing power fluctuations and voltage fluctuations and realizing power leveling. It is to provide a reverse power flow method.

【0005】[0005]

【課題を解決するための手段】前述した目的を達成する
ための技術的手段として、本発明は、風力発電を含む分
散電源を電源系統に連系させた電力系統にコンバータを
介して接続された電力貯蔵用バッテリーを具備し、その
バッテリーに貯蔵した電力を負荷に供給することにより
電力の平準化を行う電力貯蔵システムであって、夜間を
含む軽負荷時間帯に分散電源の発電電力をバッテリーに
充電し、昼間を含む重負荷時間帯にそのバッテリーの貯
蔵電力を放電することにより、負荷電力に見合った電力
を電源系統に逆潮流することを特徴とする。
As a technical means for achieving the above-mentioned object, the present invention relates to a method in which a distributed power supply including wind power generation is connected via a converter to a power supply system in which the power supply system is linked to a power supply system. A power storage system comprising a power storage battery and leveling the power by supplying the power stored in the battery to a load, wherein the power generated by the distributed power source is supplied to the battery during a light load time period including nighttime. It is characterized by charging and discharging the stored power of the battery during a heavy load time period including daytime, so that power corresponding to the load power flows backward to the power supply system.

【0006】このように軽負荷時間帯に分散電源の発電
電力をバッテリーに充電し、重負荷時間帯にそのバッテ
リーの貯蔵電力を放電することにより、負荷電力に見合
った電力を電源系統に逆潮流することで、電力変動や電
圧変動などを抑制して電力の平準化を実現することが容
易となる。
As described above, the power generated by the distributed power source is charged to the battery during the light load time period, and the stored power of the battery is discharged during the heavy load time period, so that the power corresponding to the load power flows back into the power supply system. By doing so, it becomes easy to suppress power fluctuations and voltage fluctuations and realize power leveling.

【0007】さらに、前述した電力貯蔵システムにおい
ては、分散電源の発電電力や天候情報、負荷情報を含む
各種情報をデータベース化し、その各種情報に基づいて
電源系統への逆潮流電力をパターン化し、そのパターン
化された逆潮流電力と分散電源の発電電力からバッテリ
ーの充放電電力を割り出し、その割り出し結果に基づい
てバッテリーを充放電することが望ましい。
Further, in the above-described power storage system, various types of information including the power generated by the distributed power source, weather information, and load information are stored in a database, and reverse power flow power to the power supply system is patterned based on the various types of information. It is desirable to determine the charge / discharge power of the battery from the patterned reverse power flow power and the power generated by the distributed power source, and charge / discharge the battery based on the calculation result.

【0008】特に、分散電源が風力発電システムの場
合、前述した各種情報をデータベース化し、これらデー
タベース化された各種情報に基づいて逆潮流電力をパタ
ーン化することにより、そのパターン化された逆潮流電
力から実際の分散電源の発電電力を差し引けば、バッテ
リーの充放電電力を割り出すことができ、この充放電電
力に基づけば、変動の小さい逆潮流電力でもって電力の
平準化を実現できる。
In particular, when the distributed power source is a wind power generation system, the above-described various information is stored in a database, and the reverse power flow is patterned based on the various information stored in the database. By subtracting the actual power generated by the distributed power source from the power supply, the charge / discharge power of the battery can be determined. Based on this charge / discharge power, power leveling can be realized with reverse power flow having small fluctuations.

【0009】なお、前述した電力貯蔵システムにおいて
は、バッテリーの充放電による電源系統への逆潮流と同
時に、分散電源の無効電力や高調波電流を補償すると共
に分散電源の系統連系時の単独運転を検出することも可
能である。
In the above-described power storage system, at the same time as the reverse power flow to the power supply system due to the charging and discharging of the battery, the reactive power and the harmonic current of the distributed power supply are compensated, and the single operation of the distributed power supply when the system is interconnected Can also be detected.

【0010】[0010]

【発明の実施の形態】本発明に係る電力貯蔵システムの
逆潮流方法の実施形態を以下に詳述する。なお、図4と
同一部分には同一参照符号を付す。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a reverse power flow method for an electric power storage system according to the present invention will be described in detail below. The same parts as those in FIG. 4 are denoted by the same reference numerals.

【0011】図2に示す実施形態の電力貯蔵システム4
は、例えば風力発電システムである分散電源1を電力会
社が持つ電源系統2に連系させた電力系統において、開
閉器5及び変圧器6を介してコンバータ7を接続し、そ
のコンバータ7の直流側にバッテリー8を接続した構成
を具備し、そのバッテリー8の充放電により負荷電力の
平準化を実現するものである。
The power storage system 4 of the embodiment shown in FIG.
In a power system in which a distributed power source 1 such as a wind power generation system is connected to a power system 2 owned by a power company, a converter 7 is connected via a switch 5 and a transformer 6, and a DC side of the converter 7 is connected. And a battery 8 connected thereto, and leveling of load power is realized by charging and discharging the battery 8.

【0012】この電力貯蔵システム4では、夜間を含む
軽負荷時間帯にバッテリー8を充電し、そのバッテリー
8の充電電力を昼間を含む重負荷時間帯に放電して、そ
のバッテリー8の放電電力を負荷3に供給する。本発明
の電力貯蔵システム4では、図1に示すように風力発電
システムである分散電源1の発電電力PG が1日を通じ
て変動の大きいものであっても、バッテリー8を以下の
要領に基づいて充放電する。
In the power storage system 4, the battery 8 is charged during a light load time period including nighttime, the charging power of the battery 8 is discharged during a heavy load time period including daytime, and the discharge power of the battery 8 is reduced. Supply to load 3. In the power storage system 4 of the present invention, even those generated power P G of the dispersed power supply 1 is a wind power generation system as shown in FIG. 1 is greater variation throughout the day, based on the battery 8 to the following procedure Charge and discharge.

【0013】すなわち、夜間を含む軽負荷時間帯では、
電力会社が持つ電源系統2には余剰の電力があるため、
分散電源1の発電電力PG を逆潮流させる必要がない。
したがって、この軽負荷時間帯では、電源系統2への逆
潮流電力PS が図示のように少量(図示しないがゼロで
あってもよい)となるようにバッテリー8を充放電すれ
ばよい。
That is, in a light load time zone including nighttime,
Since there is surplus power in the power system 2 owned by the power company,
The generated power P G of the dispersed power supply 1 is not necessary to reverse power flow.
Therefore, in this light load hours, the battery 8 as the backward flow power P S of the power supply system 2 is a small amount, as shown (although not shown may be zero) may be charged and discharged.

【0014】一方、昼間を含む重負荷時間帯では、電力
会社が持つ電源系統2で電力が不足する傾向にあるた
め、分散電源1の発電電力PG を多量にしかも変動を小
さくし安定して逆潮流させる必要がある。したがって、
この重負荷時間帯では、電源系統2への逆潮流電力PS
が多量で一定となるようにバッテリー8を充放電すれば
よい。
[0014] On the other hand, the heavy load time zone including the daytime, because there tends to be insufficient power supply system 2 with the power company, stably generated power P G of the dispersed power supply 1 and a large amount of addition smaller variation It is necessary to reverse flow. Therefore,
In this heavy load time zone, the reverse power flow P S to the power system 2
It is sufficient to charge and discharge the battery 8 so that is constant in a large amount.

【0015】そこで、電源系統2への逆潮流電力PS
軽負荷時間帯には少なく、重負荷時間帯には多くなるよ
うに変動の少ないパターン(図1の太い実線)を得るた
め、その逆潮流電力PS から分散電源1の発電電力PG
(図1の細い実線)を差し引きすることにより、電力貯
蔵システム4のバッテリー8の充放電電力PB (図1の
破線)を割り出す。
[0015] Therefore, the backward flow power P S is small in the light load time zone to the power supply system 2, to obtain a small pattern of variation to be larger in the heavy load hours (thick of Figure 1 solid lines), the generated power P G of the dispersed power supply 1 from the backward flow power P S
The charge / discharge power P B (dashed line in FIG. 1) of the battery 8 of the power storage system 4 is determined by subtracting (the thin solid line in FIG. 1).

【0016】このバッテリー8を前述のパターンで充放
電するために、図3に示すようなシステム制御でもって
電力貯蔵システム4のコンバータ7を出力制御する。分
散電源1の発電電力PG に基づいて、例えば天候情報や
負荷情報をデータベース化し、そのデータベース回路9
からの出力に基づいて例えばバッテリー充電量などの情
報を付加した上で逆潮流電力PS をパターン化する。こ
のパターン作成回路10で作成された逆潮流電力PS
出力指令値PS ref から分散電源1の発電電力PG を減
算器11により差し引いてバッテリー8を充放電する出
力指令値PB re f を得る。
In order to charge and discharge the battery 8 in the pattern described above, the output of the converter 7 of the power storage system 4 is controlled by system control as shown in FIG. Based on the generated power P G of the dispersed power supply 1, for example, a database of weather information and load information, the database circuits 9
Patterning the backward flow power P S in terms of additional information, such as for example a battery charge amount based on the output from. Output command value P B re f for charging and discharging the battery 8 is subtracted by the subtracter 11 the generated power P G of the dispersed power supply 1 from the output command value P S ref of backward flow power P S created by the pattern generating circuit 10 Get.

【0017】なお、前述した天候情報としては風力発電
システムに必要な風力情報、負荷情報としては電力系統
に接続された負荷容量、バッテリー充電量としては現時
点におけるバッテリーに残存する充電量などが列挙され
る。これら天候情報、負荷情報やバッテリー充電量以外
の他の各種情報も必要に応じて入力すればよい。
The weather information includes wind information necessary for the wind power generation system, the load information includes a load capacity connected to the power system, and the battery charge amount includes a charge amount remaining in the battery at the present time. You. Various types of information other than the weather information, the load information, and the battery charge amount may be input as needed.

【0018】このバッテリー8を充放電する出力指令値
B ref に、分散電源1の無効電力や高調波電流を補償
する補償信号と共に分散電源1の系統連系時の単独運転
を検出するための外乱信号を付加して出力電力制御回路
12に入力する。この出力電力制御回路12では、図1
のバッテリー8の充放電電力PB (図1の破線)でもっ
てバッテリー8を充放電するための出力指令値PB ref
をコンバータ7に出力する。
The output command value P B ref for charging / discharging the battery 8 is used together with a compensation signal for compensating the reactive power and the harmonic current of the distributed power source 1 to detect the isolated operation of the distributed power source 1 when the system is interconnected. A disturbance signal is added to the output power control circuit 12. In this output power control circuit 12, FIG.
The output command value P B ref for charging / discharging the battery 8 with the charge / discharge power P B of the battery 8 (broken line in FIG. 1)
Is output to the converter 7.

【0019】さらに、前述した補償信号に基づいて分散
電源1の無効電力や高調波電流を補償することができる
と共に、外乱信号に基づく能動方式により分散電源1の
系統連系時の単独運転を検出することもできる。
Furthermore, the reactive power and the harmonic current of the distributed power supply 1 can be compensated based on the compensation signal described above, and the isolated operation of the distributed power supply 1 at the time of system interconnection is detected by an active method based on a disturbance signal. You can also.

【0020】[0020]

【発明の効果】本発明によれば、分散電源が風力発電シ
ステムの場合、前述した各種情報をデータベース化し、
これらデータベース化された各種情報に基づいて逆潮流
電力をパターン化することにより、そのパターン化され
た逆潮流電力から分散電源の発電電力を差し引けば、バ
ッテリーによる充放電電力を算出することができ、この
充放電パターンに基づけば、変動の小さい逆潮流電力を
電源系統に供給することができて電力の平準化を容易に
実現できる。
According to the present invention, when the distributed power source is a wind power generation system, the above-described various information is stored in a database,
By patterning the reverse power flow based on these various types of information in the database, the charge / discharge power of the battery can be calculated by subtracting the power generated by the distributed power source from the patterned reverse power flow power. On the basis of this charge / discharge pattern, reverse power flow with small fluctuation can be supplied to the power supply system, and power leveling can be easily realized.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明方法の実施形態で電力パターンを示す波
形図
FIG. 1 is a waveform diagram showing a power pattern in an embodiment of the method of the present invention.

【図2】本発明の実施形態における電力貯蔵システムを
示す回路構成図
FIG. 2 is a circuit configuration diagram showing a power storage system according to the embodiment of the present invention.

【図3】本発明方法を実施する上でのシステム制御ブロ
ック図
FIG. 3 is a system control block diagram for implementing the method of the present invention.

【図4】風力発電システムを電源系統に連系させた電力
系統を示す構成図
FIG. 4 is a configuration diagram showing a power system in which a wind power generation system is connected to a power system.

【図5】風力発電システムの発電電力を示す波形図FIG. 5 is a waveform diagram showing generated power of a wind power generation system.

【符号の説明】[Explanation of symbols]

1 商用電源系統 2 分散電源 3 負荷 4 電力貯蔵システム 7 コンバータ 8 バッテリー PG 分散電源の発電電力 PS 逆潮流電力 PB 充放電電力1 the commercial power supply system 2 distributed power 3 Load 4 power storage system 7 Converter 8 Battery P G distributed power generated power P S backward flow power P B charge-discharge electric power of

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 風力発電を含む分散電源を商用電源系統
に連系させた電力系統にコンバータを介して接続された
電力貯蔵用バッテリーを具備し、そのバッテリーに貯蔵
した電力を負荷に供給することにより電力の平準化を行
う電力貯蔵システムであって、夜間を含む軽負荷時間帯
に分散電源の発電電力をバッテリーに充電し、昼間を含
む重負荷時間帯にそのバッテリーの貯蔵電力を放電する
ことにより、負荷電力に見合った電力を商用電源系統に
逆潮流することを特徴とする電力貯蔵システムの逆潮流
方法。
1. A power storage battery connected via a converter to a power system in which a distributed power supply including wind power generation is linked to a commercial power supply system, and the power stored in the battery is supplied to a load. A power storage system that levels power by charging the battery with the power generated by the distributed power source during light load periods including nighttime and discharging the stored power of the battery during heavy load periods including daytime. A reverse flow of power corresponding to the load power to the commercial power supply system.
【請求項2】 前記電力貯蔵システムにおいて、分散電
源の発電電力や天候情報、負荷情報を含む各種情報をデ
ータベース化し、その各種情報に基づいて商用電源系統
への逆潮流電力をパターン化し、そのパターン化された
逆潮流電力と分散電源の発電電力からバッテリーの充放
電電力を割り出し、その割り出し結果に基づいてバッテ
リーを充放電することを特徴とする請求項1記載の電力
貯蔵システムの逆潮流方法。
2. In the power storage system, various types of information including generated power of a distributed power source, weather information, and load information are stored in a database, and reverse power flow power to a commercial power supply system is patterned based on the various types of information. 2. The reverse power flow method for a power storage system according to claim 1, wherein the charge / discharge power of the battery is determined from the reverse power flow power and the power generated by the distributed power source, and the battery is charged / discharged based on the calculation result.
【請求項3】 前記電力貯蔵システムにおいて、バッテ
リーの充放電による商用電源系統への逆潮流と同時に、
分散電源の無効電力や高調波電流を補償すると共に分散
電源の系統連系時の単独運転を検出するようにしたこと
を特徴とする請求項1記載の電力貯蔵システムの逆潮流
方法。
3. In the power storage system, at the same time as reverse power flow to a commercial power supply system due to charging and discharging of a battery,
2. The reverse power flow method for a power storage system according to claim 1, wherein the reactive power and the harmonic current of the distributed power source are compensated, and the isolated operation when the distributed power source is connected to the grid is detected.
JP10343274A 1998-12-02 1998-12-02 Inverse power flow method of power storing system Withdrawn JP2000175360A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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