• 전기학회논문지
• /
• 제66권7호
• /
• pp.1039-1046
• /
• 2017

Campus microgrid is designed and built by considering not only power generation but also power consumption management as connected microgrid type because the main goal of the campus microgrid is to save power consumption costs. There are many functions to achieve the goal and they are mainly to use generation-based functions such as islanding operation for peak management and for emergency events. In power distribution operation, Conservation Voltage Reduction (CVR) is applied in order to reduce power consumption. The CVR is defined as a function for load consumption reduction by voltage reduction in order to reduce peak demands and energy consumption. However, application of CVR to microgrid is difficult because the microgrid cannot control a tap of transformer in a substation and the microgrid normally is not designed with phase modifying equipment like a step-voltage-regulator which can control voltage in power distribution system operation. In addition, an impact of the CVR is depended on load characteristics such as a normal load, a rated power, and synchronous motors. Therefore, this paper proposes an application of CVR using linear voltage control based AVR in campus microgrid with power consumption reduction considering characteristics of load and component in the microgrid. The proposed system can be applied to each buildings by a configuration of power distribution cables; and the application results and CVR factor are presented in this paper.

• 전기학회논문지
• /
• 제66권12호
• /
• pp.1689-1696
• /
• 2017

In this paper, the voltage measurement-based coordinated Voltage/VAR control (VMCVVC) algorithm for conservation voltage reduction(CVR) is proposed. The proposed algorithm has the purpose of enhancing the CVR effect through coordinated control of the voltage control devices such as the distributed energy resources and the load tap changer(LTC) transformers. It calculates the references of the voltage control devices such that the bus voltages are maintained at as close to the lower operation limit as possible. For this purpose, firstly, the distribution system is divided into LTC transformer control zones through topological search. Secondly, the reactive power references of the reactive power control devices are determined such that the voltage profile of the section is flattened. Finally, the tap references of the LTC transformers are calculated to lower the voltage profile. The effectiveness of the proposed algorithm is demonstrated through case studies using IEEE test network.

• KEPCO Journal on Electric Power and Energy
• /
• 제2권4호
• /
• pp.549-556
• /
• 2016

CVR은 계통의 전압을 감소시켜 소비 전력을 줄이는 기술로, 과거 많은 실증과 연구가 진행되어 왔다. 최근, SCADA 기반 또는 AMI 기반의 VVC가 개발되면서 CVR이 중요한 운영 방식이 되었다. CVR은 다양한 계측기를 사용하여 폐루프 제어(closed loop control)방식으로 최적 VVC제어 지령치를 결정한다. 본 논문에서는 전압 계측기반 CVR제어 알고리즘 개발 및 검증을 위한 RTDS-MATLAB 연동 환경을 구현하였다. RTDS를 이용하여 배전 계통의 전압제어기기들을 모델링하고 MATLAB으로 RTDS의 모의 계통의 전압을 계측하고 제어할 수 있는 제어기를 구성하였다. 무효전력 제어기기인 캐패시터는 계통의 전압을 평탄화하고 계통의 전압 기반으로 OLTC의 탭 제어를 하여 계통의 전압을 낮추는 제어 알고리즘을 MATLAB을 통해 구현하였다. 시뮬레이션을 통해 제안한 시스템을 검증하였다.