IEEE Power & Energy Magazine - March/April 2018 - 49

Ten vertically integrated electric utilities are required
to separate their T&D business sector under the new
electricity business law by 2020.
generation, which present difficulties for the cdcc to properly estimate its area demand due to the intermittent PV output.
Moreover, it is not practical for the cdcc to remotely measure
the actual output of hundreds of thousands of PV systems.
to integrate intermittent renewable energy resources into
the cePcO power network, the cdcc has employed, since
2014, the PV output forecast system that ensures the accuracy of the demand-supply balancing operation. this system
enables system operators to better understand and estimate
the total solar generation output [MW] based on weather forecasts and real-time solar radiation data from multiple measure
points (figure 3).
the forecast system provides two functions: a situational
awareness of real-time PV output and the estimation of future
PV output. Both functions are realized based on various input
data such as solar radiation, outside temperature, date, time,

Bilateral
Data Flow

Retail and Customer Service
Company

Fuel and Power Generation
Company
Generation
Scheduling

geographical information, angle and direction of solar panels,
and solar generation capacity. this also integrates data from
multiple measurement points of solar radiation owned by both
cePcO and the Japan Meteorological Agency.
In this system, cePcO's t&d supply area is divided into
14 subareas, taking into account the meteorological similarities and the jurisdictions of weather forecasters. PV outputs
in each area are calculated based on the algorithm model
shown in figure 3, and these PV outputs are summed
to determine the total PV output for the entire system. In
the situational awareness of real-time PV output function,
total PV output in cePcO is calculated every minute. each
area has more than three solar radiation measurement points
to allow for the contingency loss of measurement data. In
the estimation of future PV output function, 48-h-ahead PV
output is forecasted three times a day.

Wholesale
Transaction

Demand
Scheduling

OCCTO
(Organization for Cross-Regional Coordination
of Transmission Operators)

Unilateral
Data Flow

Wholesale
Transaction

JEPX
(Japan Electric Power Exchange)

Network Information
Outage Scheduling
Regulation Scheduling

Renewable Energy Bidding
(Purchased by T&D Company)

Power-Trading System

Coordination Server with OCCTO

etc.
Network
Information

Outage
Scheduling

Regulation
Scheduling

Imbalance
Calculation

Renewable Energy
Management

TSO (Transmission System Operator) of CEPCO T&D

figure 2. The planning linkage system to connect TSOs, OCCTO, and JEPX.
march/april 2018

ieee power & energy magazine

49



Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - March/April 2018

Contents
IEEE Power & Energy Magazine - March/April 2018 - Cover1
IEEE Power & Energy Magazine - March/April 2018 - Cover2
IEEE Power & Energy Magazine - March/April 2018 - Contents
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IEEE Power & Energy Magazine - March/April 2018 - Cover3
IEEE Power & Energy Magazine - March/April 2018 - Cover4
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