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

SUMMARY Recent years, installation of photovoltaic (PV) system is active by the environmental problem and feed in tariff system. Due to PV's output fluctuation, the static var compensator (SVC) made by power electronics technology is planning to install in distribution system. The SVC is expected for maintain the voltage. But SVC differs in a theory of operation of the existing voltage controller load ratio control transformer (LRT) and step voltage regulator (SVR). Because the SVC operation makes the system impedance changes, the existing voltage controller may not operate effectively. In this study, the intelligent‐control method which used the radial basis function (RBF) network is proposed. This method can reduce the effects of the SVC operation by including the performance characteristics of SVC in the conventional method. An advantage of unnecessary arrangement attention of the SVC setup node and easy cooperation with the existing equipment is obtained by applying this method.

Section: Introductionmentioning

confidence: 99%

Study on a Voltage Estimation of Tap‐Changing Transformer in Consideration of SVC Introduction

Yonezawa

Matsuoka

Takayama

et al. 2017

“…Some techniques using existing voltage control equipment such as SVR (Step Voltage Regulator) and LRT (Load Ratio control Transformer) [1,2] are helpful, but their tracking performance with respect to sharp output fluctuations of renewable energies remains limited. There are also methods of fast reactive power control using SVC (Static Var Compensator) [3,4], but these incur high costs. On the other hand, interconnected distributed generators provided with power conditioner systems (PCS) can contribute to voltage regulation through reactive power control without any additional equipment, thus offering better economical performance.…”

Section: Introductionmentioning

confidence: 99%

Autonomous Decentralized Voltage Profile Control Method Using Communication Function of Smart Meters in Distribution Systems

Omori

Koide

Tsuji

et al. 2017

SUMMARY The introduction of renewable energy sources, such as photovoltaics or wind turbines, has been greatly promoted recently in order to improve the energy and environmental issues. In distribution systems with a large number of distributed generators, voltage profile management becomes one of serious problems due to the reverse power flow. Usual PCS (Power Conditioning System) reduces their active power output if they detect the voltage violation from the upper limit in order to get the voltage profile back to the proper range. However, since the magnitude of voltage fluctuation at the nodes with PCSs are different each other, there is a possibility that the amount of the curtailment are not the same among them. Hence, in this paper, we developed a new method which can solve the problem by using information exchange between PCSs using communication function of smart meters supposing the communication among them is available every 30 min. The proposed method was tested in 38‐node model system and its effectiveness was shown.

“…Particularly, LRT and SVR operate discretely based on tap change, which may result in instable phenomena (e.g., hunting), and coordinate operation between LRT and multiple SVRs in the case of high PV penetration has been discussed in literatures [6][7][8]. Besides, coordination between LRT/SVR tap operations and continuous reactive power control in distributed generators and SVC is studied in literatures [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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

Nose

Tsuji

Oyama

et al. 2016

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).