Abstract
In the distribution system installed a Step Voltage Regulator (SVR), maximum capacity of distributed generators (DGs) is calculated where DGs are completely dispersed on distribution line. The calculation method is that maximum capacity of DGs is calculated under the restriction condition of upper (lower) voltage regulation value and allowable current value by using voltage and current profile which are expressed analytically based on power density model that the authors propose. As voltage control method of SVR, they consider existing SVR whose ratio of transformation is fixed to 1 if it detects reverse power flow, and reverse power flow type SVR which operates appropriately even if it detects reverse power flow.
From calculation results on maximum capacity of DGs for power factor of DGs, it is found what the parameters like power factor of DGs, distribution of DGs, and magnitude of load influence maximum capacity of DGs. From calculation results on maximum capacity of DGs for length of system, it is found that restriction condition is classified two modes in existing SVR and four modes in reverse power flow type SVR respectively. Maximum capacity of DGs in the system with reverse power flow type SVR is larger than that in the system with existing SVR.
