A Study on the Control Method of Customer Voltage Variation in Distribution System with PV Systems

Abstract

-This paper deals with the modified modeling of PV system based on the PSCAD/EMTDC and optimal control method of customer voltages in real distribution system interconnected with the photovoltaic (PV) systems. In order to analyze voltage variation characteristics, the specific modeling of PV system which contains the theory of d-q transformation, current-control algorithm and sinusoidal PWM method is being required. However, the conventional modeling of PV system can only perform the modeling of small-scale active power of less than 60 [kW]. Therefore, this paper presents a modified modeling that can perform the large-scale active power of more than 1 [MW]. And also, this paper proposes the optimal operation method of step voltage regulator (SVR) in order to solve the voltage variation problem when the PV systems are interconnected with the distribution feeders. From the simulation results, it is confirmed that this paper is effective tool for voltage analysis in distribution system with PV systems.

Voltage Control Method of Micro Hydropower Generators for Voltage Stabilization in Distribution Feeder with Renewable Energy Sources

“…However, when the PV systems were interconnected and operated in distribution systems, many problems related to power quality such as voltage fluctuation in distribution system have occurred [1][2][3][4][5]. Under these circumstances, the power company has installed SVR in order to keep voltages of customers within allowable voltage limits in distribution feeders with PV systems [6,7]. In addition, the distributed generations, renewable energy sources, should be kept at more than 90% of PF in accordance with the grid interconnection codes, and in case of technically necessary, the upper and lower limits of PF should be controlled according to technical guideline of the power company, and also PF of the distributed generations must not become leading PF at the point of distribution system which is lagging PF at distributed generations [8,9].…”

Novel Voltage Control Method of the Primary Feeder by the Energy Storage System and Step Voltage Regulator

“…During the scheduled delay time, the customer voltage could not be maintained within the allowable limit. The references [5] and [2] dealt with contents to solve the feeder voltage problems using a LDC (line drop compensation) operation method that adjusts the sending voltage based on the increase and decrease of the load current, when a Photovoltaic (PV) system is interconnected with the primary feeder. However, the consumer voltage cannot maintain a nominal voltage boundary during the delay time of SVR tap operation.…”