成果報告書詳細
管理番号20140000000551
タイトル平成25年度成果報告書 新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業(太陽光発電) 「直流電力給電線を使ったPLCによる直流電力監視用直流電流計測システム」
公開日2014/10/29
報告書年度2013 - 2013
委託先名株式会社アセット・ウィッツ 国立大学法人東京工業大学
プロジェクト番号P10020
部署名イノベーション推進部
和文要約件名:平成25年度成果報告書 新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業(太陽光発電) 「直流電力給電線を使ったPLCによる直流電力監視用直流電流計測システム」

研究開発項目の成果
研究開発項目(1)マイコン、及び通信機能を一体化した直流電流センサの基本設計とボード試作
(a) 直流電流センサの構成部品の調査(株式会社アセット・ウィッツ(AW))
ホール素子他、各構成部品を調査し、センサ最終パッケージの構造イメージを設計した。また市販のホール素子+フェライト+増幅器ICを用いて、簡易電流センサと簡易磁界センサを試作し、稼動中の太陽光発電設備で発電設備の各部の電流や雑音を計測した。
(b) 直流電流センサの基本設計とボード試作(東京工業大学)
直流電流センサではスペクトラム拡散型のチョッパーアンプ方式が最も優れたSNRが実現可能であることを示し、ボードの消費電力は30mW、集積回路では4mWの低消費電力動作が可能であることを実証した。
研究開発項目(2) 直流電力計測データ送受信システムの基本設計ボード試作
(a) 直流電力計測データ送受信システムの環境調査と試作ボードの評価(AW)
稼働中の太陽光発電設備(株式会社ウイビリーブ@石川県)で、電流/雑音を計測し、本開発による雑音抑圧方式の有効性を確認した。
(b) 直流電力計測データ送受信システムの基本設計とボード試作(東京工業大学)
直流電力計測データ送受信システムの基本設計とボード試作を行った。通信規格としては920MHz帯のSmart Utility Network (SUN)を用いた。
研究開発項目(3) ビジネスプランの策定(AW)
(a) 競合電力計測システムの調査
協力企業(近計システム)以外の競合電力計測システムを調査し、コア技術である超小型低消費電力直流電流センサに特長を持つ本開発と類似のシステムはなく、高い優位性を持つことが分かった。
(b) 事業開発基本方針
通信等、コア技術以外の技術については、外部との連携で対処する開発基本方針を決めた。
英文要約Title:New Energy Venture Business Technology Innovation Program/ New Energy Venture Business Technology Innovation Program (Solar Power)/ Direct-Current Measurement System for monitoring the Direct-Current Power Using PLC through the Direct-Current Feeder Cable (FY2013) Final Report

[1]The basic design and experimental manufacture of the electric direct-current sensor and the test board where sensor chip, a microcomputer, a PLC communication function, and other components are unified.
(a) Investigation of component parts of the electric direct-current sensor (AW)
First, the major component parts of the electric direct-current sensor, for examples, Hall device were investigated, and using the information, the final image of the sensor package was designed.
Next, using a commercial Hall device, a ferrite and an amplifier IC, the simple electric current sensor and the simple magnetic-field sensor were experimentally made for the purpose of the real current and noise measurement of a photovoltaic power generation equipment under operation for preliminary survey.
(b) Basic design of the electric direct-current sensor and the experimental production of
the test board (Tokyo Institute of Technology)
It became clear by the simulation that by applying CDMA technology, the sensitivity on the electric direct-current measurement increased even under noisy environment.
Next, the basic design of the integrated circuit for sensors and the test board were carried out. As results, low-power operation of 4-mW were confirmed, which is 1/25 of the target.

[2] Basic design of the communication system for the measurement data and the
experimental production of the test board.
(a) Investigation of the noise environment on the photovoltaic generation equipment under operation (AW)
Using sensors mentioned before, the real current and noise of each part of a photovoltaic power generation equipment under operation were measured as preliminary survey.
It became clear that the effectiveness of our measurement system for the noise suppression was confirmed.
(b) Basic design of the communication system for the measurement data and
The experimental production of the test board (Tokyo Institute of Technology)
 In addition to PLC, the wireless system was also examined as the communication means. By the experimental production of the test board and the basic design of the communication system using the 920MHz SUN chip set, the basic performance of our measurement system was confirmed to satisfy the target specification.
 
[3] Drawing up of the business plan (AW)
(a) Investigation of the competing systems of the electric direct-current power measurement system for photovoltaic power generation equipment.
The competing electric power measurement systems were investigated. It became clear that there is no similar systems to our system, where such small and low-power-consumption electric direct-current sensors as ours which has also unique and smart functions as noise reduction are used, and has high competitive superiority.
(b) Searching of the business partners
As our basic development policy, we decided to focus our effort on the practical realization of our unique and smart electric direct-current sensors. On the other hand, we will aim at the partnership for the other technologies as the communication chip, on which we don’t have high competitive superiority.
Negotiations with some companies have been started.
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