A Time Scale Separation Method for the Coordination of Voltage Controls for SVC and SVR

In recent years, the deterioration in the power quality of a distribution system such as the aggravation of voltage imbalance and current imbalance or the increase of harmonics has been apprehended. It is thought to be causally related to the diversification of load by progress of power electronics technology and the increase of the number of interconnection of distributed generators for home use with the reduction of the effect on the environment. The purpose of this study is development of power conditioner systems (PCSs) with a function of improvement of power quality in the distribution system. In this paper, the authors propose a control method of restraint of harmonics and improvement of voltage imbalance in the distribution system utilizing the PCSs of photovoltaic systems. Moreover, it includes a determination method of the interconnection power factor and the optimal gain of filtering operation of PCSs so as to minimize the voltage imbalance factor and so as to minimize the maximum value of voltage total harmonic distortion in the distribution system by real-time feedback control with measured data from the information technology switches of distribution line. The numerical calculation is carried out in order to verify the validity of the proposal method. C⃝ 2016 Wiley Periodicals, Inc. Electr Eng Jpn, 198(3): 58-67, 2017; Published online in Wiley Online Library (wileyonlinelibrary.com).

Section: Step 2 If Voltage Values Calculated Atmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improvement of Power Quality in Distribution System by Residential PV Systems

Shoji

Terada

Taoka

et al. 2016

“…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.…”

Section: Introductionmentioning

confidence: 99%

“…In this context, many studies have been conducted on voltage regulation in distribution systems. 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. With voltage regulation using LRT, SVR, and so on, voltage profile on the feeder terminal side can be controlled uniformly, thus producing a wide-range effect.…”

Section: Introductionmentioning

confidence: 99%

Voltage Regulation Utilizing Electric Vehicle Rapid Chargers in a Distribution System

Nakamura

Hara

Kita

et al. 2018

From growing interests in the environment issues, promotion of photovoltaic power generation (PV) is accelerated in the world. Meanwhile, rapid chargers (RCs) for popularized electric vehicles are being installed in urban areas. These two trends in distribution system might cause severer voltage fluctuation problems. On the other hand, a RC can provide the reactive power support, which is capable of voltage regulation. Based on this viewpoint, this paper proposes a new framework of voltage regulation, in which the reactive power compensation by RCs is actively utilized. The proposed voltage regulation method combines two different control functions with consideration for overcompensation avoidance. This paper ascertains the validity of proposed voltage regulation method through numerical simulations. C⃝ 2018 Wiley Periodicals, Inc. Electr Eng Jpn, 204(3): 21-30, 2018; Published online in Wiley Online Library (wileyonlinelibrary.com).

“…Thus, the point voltages must be regulated very rapidly by instantaneous removal of noload power by installing self-exciting load-less power compensators (static synchronous compensator [STATCOM]) in the distribution grid [6][7][8]. However, due to operating settings that take account of mechanical switching and the life span of equipment, the voltage cannot be regulated instantaneously and frequently.…”

Section: Introductionmentioning

confidence: 99%

Cooperative Control by System Voltage Control Equipments in Consideration of Reducing Capacity of STATCOM

Shoji

Kurokawa

Taoka

et al. 2015

In recent years, the number of renewable energy sources (RESs) such as photovoltaic generation systems and wind power generation systems connected to the grid has been increasing as a way of reducing negative effects on the environment. The outputs of these RESs vary rapidly because of the influence of the weather and the conditions of the location. Therefore, there are concerns that the point voltages in a distribution system may vary drastically and that the voltages may deviate from the appropriate voltage range as a result of the influence of the RES connected to the distribution system or to the diversification of loads. Furthermore, there are concerns about adverse effects on electric power quality, such as voltage imbalances and harmonics. In this paper, we propose a cooperative voltage control method for a distribution system using system voltage control equipment in order to reduce the capacity of the static synchronous compensator. Numerical calculations were performed in order to verify the validity of the proposed method. C⃝ 2015 Wiley Periodicals, Inc. Electr Eng Jpn, 194(1): 1-9, 2016; Published online in Wiley Online Library (wileyonlinelibrary.com).