Methodology : TH_AM017 Ver1.0

Methodology No. TH_AM017
Proposed Methodology No. TH_PM020
Sectoral scope 2. Energy distribution
Title Low-carbon Operation for Power Grid Utilizing Online Voltage-var(Q) Optimal Control with ICT
Summaries GHG emission reduction measures : This methodology applies to projects that aim at reducing transmission loss by introducing OPENVQ and optimizing voltage and reactive power of transmission system.
Calculation of reference emissions : Reference emissions are GHG emissions attributed to transmission loss calculated on the basis of historical voltage profile, historical reactive power profile, and condition of transmission system after implementation of the project. Transmission loss is calculated by the calculation formula based on electric circuit theory, which is adopted by Electricity Generating Authority of Thailand (EGAT). Reference voltage profile is determined by the mode value calculated from an analysis of distribution of the historical voltage measured during a period of at least one year prior to the period not earlier than 6 months before starting operation of the project. Reference reactive power is determined based on the reference voltage profile and active power of transmission line measured after implementation of the project.
Calculation of project emissions : Project emissions are calculated on the basis of transmission loss calculated from the monitored values using the formula based on electric circuit theory, which is adopted by EGAT.
Monitoring parameters : Active power, reactive power, voltage, resistance, reactance, susceptance of the transmission line, and the number of transmission lines in the project area X are measured. Reference/project transmission line loss, reference reactive power and reference voltage are calculated and monitored in OPENVQ system based on the measured parameters.
Version Number Ver1.0
Status Valid
Methodology Proponent Hitachi, Ltd.
Approved Methodology
Proposed Methodology
Public comments
  • 06 Jan 22   -  20 Jan 22
Date of approval 17 Jun 22