A LRT Control Method Using Sensor Information in Distribution Systems with a Large Amount of PVs and EVs

Abstract

It is of prime importance to maintain voltage profile within the proper range in distribution systems with a large amount of photovoltaics and electric vehicles (EVs). In particular, there is a possibility that line drop compensation (LDC) logic, which is utilized for the control of load ratio tap transformer (LRT) does not work properly when reverse power flow is included partially. Hence, in this paper, we have developed a new LRT control method based on the sensor information supposing that some section switchgears with sensors are introduced in the future distribution systems. Specifically, the extreme value of voltage profile is estimated by convergence calculation in the section between the section switchgear with sensor and LRT. Moreover, the voltage at the end node can be estimated by LDC method using sensor information of section switchgear. The proposed method was tested using a distribution system model and its effectiveness was shown. C⃝ 2016 Wiley Periodicals, Inc. Electr Eng Jpn, 198(4): 51-62, 2017; Published online in Wiley Online Library (wileyonlinelibrary.com).

Voltage Regulation Utilizing Electric Vehicle Rapid Chargers in a Distribution System

“…Literature [1][2][3][4][5][6][7] explores new methods of voltage control using LRT (Load Ratio control Transformer) and SVR (Step Voltage Regulator) installed at distribution substations. On the other hand, a number of problems have become pronounced on the distribution system level such as voltage rise caused by reverse power flow when PV output exceeds demand, and short-period voltage fluctuations caused by varying PV output.…”

Coordinated control of OLTC and multi‐CEMSs for overvoltage prevention in power distribution system

“…To solve the overvoltage problem, a series of studies have been performed. The operation and coordination of voltage control devices in a distribution system, such as on‐load tap changer (OLTC), step voltage regulator (SVR), static var compensator (SVC), shunt capacitor (SC), and/or shunt reactor (SR), are basic approaches from the distribution system operator's (DSO's) aspect . These studies aim at maintaining the grid voltage within the allowed range and to relieve the stress on mechanical‐switching‐based devices stress.…”