DC:AC ratio

Japanese translation: 過積載率・積み増し比率

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:DC:AC ratio
Japanese translation:過積載率・積み増し比率
Entered by: komazawa

07:55 Sep 30, 2016
English to Japanese translations [PRO]
Science - Energy / Power Generation / Photovoltaic Power Generation
English term or phrase: DC:AC ratio
Recent trends in the PV industry have been towards an increasing DC:AC ratio,
where the AC conversion capacity attached to a PV system is significantly
smaller than the nameplate DC value. As the cost of the DC components
continues to decrease, and the need to reduce grid disturbances due to
the intermittent behavior of conventional PV systems, this trend will likely
accelerate even further. For this trend to continue significantly beyond the
DC:AC ratios of 1.4 being used today however, several hardware limitations
on conventional systems will have to be resolved. This paper describes a cost
competitive, and highly redundant electrical topology where these hardware
limitations have been eliminated.
Yoriko Mizuno
Australia
Local time: 15:45
過積載率・積み増し比率
Explanation:
ソーラーパネルは直流(DC)を発生し、それを電力網(交流=AC)に送出するためにパワコン(power conditioner)が使われます。現在、各機器のコスト構成上、パワコンが変換できるすべての電力にジャストフィットしたパネルを組み合わせるより、少し大きめのパネルを組み合わせたほうが経済効率が良いことが判り、パワコンの能力を超えるパネルを取り付けることを過積載と呼ぶようになったようです。DC:AC ratioは、この能力の組み合わせを比率で示したものです。検索ワード「太陽光 積み増し比率」「過積載率」。経済産業省の資料では、「パネル対パワーコンディショナーの容量の比率」という解かりやすい表記が多用されています。一方で、専門の電気屋さんたちのサイトでは「過積載率」「積み増し率」が使われています。原文のNameplate DC value は太陽電池の銘板の値で、定格発電電力とか最大発電電力といった意味にとれます。DC componentsとは概して太陽電池のことでしょう。
Selected response from:

komazawa
Japan
Local time: 13:45
Grading comment
ありがとうございました。大変参考になりました。
4 KudoZ points were awarded for this answer



Summary of answers provided
4 +2過積載率・積み増し比率
komazawa
3直流から交流への変換率
cinefil
Summary of reference entries provided
太陽光発電の過積載(積み増し)
multiverse

  

Answers


1 hr   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +2
dc:ac ratio
過積載率・積み増し比率


Explanation:
ソーラーパネルは直流(DC)を発生し、それを電力網(交流=AC)に送出するためにパワコン(power conditioner)が使われます。現在、各機器のコスト構成上、パワコンが変換できるすべての電力にジャストフィットしたパネルを組み合わせるより、少し大きめのパネルを組み合わせたほうが経済効率が良いことが判り、パワコンの能力を超えるパネルを取り付けることを過積載と呼ぶようになったようです。DC:AC ratioは、この能力の組み合わせを比率で示したものです。検索ワード「太陽光 積み増し比率」「過積載率」。経済産業省の資料では、「パネル対パワーコンディショナーの容量の比率」という解かりやすい表記が多用されています。一方で、専門の電気屋さんたちのサイトでは「過積載率」「積み増し率」が使われています。原文のNameplate DC value は太陽電池の銘板の値で、定格発電電力とか最大発電電力といった意味にとれます。DC componentsとは概して太陽電池のことでしょう。

Example sentence(s):
  • パワコン 10KW に  パネル 12KW を接続  → 過積載率120% (1.2倍)

    Reference: http://hatsudenkakaku.info/entry97.html
    Reference: http://www.meti.go.jp/committee/chotatsu_kakaku/pdf/017_03_0...
komazawa
Japan
Local time: 13:45
Works in field
Native speaker of: Native in JapaneseJapanese
PRO pts in category: 4
Grading comment
ありがとうございました。大変参考になりました。

Peer comments on this answer (and responses from the answerer)
agree  multiverse
11 hrs

agree  Yasutomo Kanazawa
1 day 5 hrs
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7 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5
dc:ac ratio
直流から交流への変換率


Explanation:
ソーラー発電の問題の一つはソーラーパネルで発電した直流電流を商用の交流電流に変換するさいの効率の低さです。

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Note added at 4時間 (2016-09-30 11:59:28 GMT)
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http://www.jbits.co.jp/materials/photovoltaic_1.html
http://blog.rokutech.jp/article/120807283.html
http://www.solaredge.com/sites/default/files/inverter_dc_ove...

cinefil
Japan
Local time: 13:45
Works in field
Native speaker of: Native in JapaneseJapanese
PRO pts in category: 23
Notes to answerer
Asker: ありがとうございました。


Peer comments on this answer (and responses from the answerer)
agree  Mari Hata: 直流交流電力変換効率としてもいいと思います。
5 hrs
  -> ありがとうございます。

disagree  multiverse: DC/AC変換効率は今や100%に近いところまで来ています。 See my reference comments.
12 hrs
  -> だから?訳もだめ?どんな条件でも?いちゃもんもいいけど訳語の提案は?
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Reference comments


12 hrs
Reference: 太陽光発電の過積載(積み増し)

Reference information:
2015年に建設された電力事業用太陽光
発電所の大半において、DC/AC比率(太陽電池パネルの積み増し比率)は、1.2~1.4となっている。
http://www.nedo.go.jp/content/100785821.pdf

太陽光発電の過積載(積み増し)とは
太陽光発電のメガソーラープロジェクトなどで、「過積載(積み増し)」という手法が使われる事があります。これは簡単に言うと、パワーコンディショナー(AC)の容量に対して、ソーラーパネル(DC)の容量を大きくすることを指します。
http://standard-project.net/solar/words/kasekisai.html


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Note added at 16時間 (2016-09-30 23:57:07 GMT)
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The DC to AC ratio (also known as the Inverter Load Ratio, or “ILR”) is an important parameter when designing a solar project. For example, a 6-kW DC array combined with a 5-kW AC rated inverter would have a DC/AC ratio of 1.2 (6 kW / 5 kW = 1.2).
http://www.solarpowerworldonline.com/2016/07/solar-inverters...

The recent trend of reduced costs of PV modules compared to the cost of inverters has introduced the concept of oversizing the PV array as a cost-effective method for increasing system output. The metric used to measure oversizing is known as the DC-AC ratio, array-to-inverter ratio, or simply the oversizing-ratio. For example a 3kW inverter with an oversizing ratio of '2' will use a 6kWp array.
http://www.theaustralian.com.au/business/business-spectator/...

PV system designers and developers are tasked with the important decision of selecting the optimal Array-to-Inverter ratio for each inverter in a given project. The Array-to-Inverter ratio defines the relationship between the array’s nameplate power rating at Standard Test Conditions (cell temp of 25ᵒC, irradiance of 1000W/m2, and Air-Mass 1.5) to the inverter’s rated AC output power. As an example, a system with a 120kWdc array feeding a 100kWac inverter has an Array-to-Inverter Ratio of 1.2. The Array-to-Inverter Ratio is known by several names in the solar industry, including Oversizing Ratio, Overloading Ratio, and DC-AC Ratio. Until recent years, due to the high cost of modules, PV systems were designed with the aim of maximizing energy production per PV module. This approach typically resulted in oversizing ratios between 1.10 to 1.25 depending on the project location and design specific DC loss factors such as tilt angle, orientation, mounting method, DC wiring losses, mismatch, and soiling. With falling module prices, project financials have changed in favor of higher Array-to-Inverter ratios. The purpose of this article is to explain why systems are being oversized, the technical considerations relating to oversizing, and the impact of oversizing on the life of the inverter.
http://www.solarpowerworldonline.com/2013/06/supersize-it-ov...

multiverse
Japan
Native speaker of: Native in JapaneseJapanese
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