September 15, 2020
Conference Paper

Combined Transmission and Distribution Test System to Study High Penetration of Distributed Solar Generation

Xiangqi Zhu
Jiyu Wang
Ning Lu
Quan Nguyen
Marcelo Elizondo
Jesse Holzer
Siddharth Sridhar
Renke Huang
Xinda Ke
Bharat Vyakaranam
Mallikarjuna Vallem
Yuri Makarov
Nader Samaan


Transmission and distribution (T&D) standard test systems are currently defined separately, and are critical for researchers and engineers to test new solutions. Growing installation of energy resources in distribution and sub-transmission systems is creating higher interactions between T&D systems. This paper proposes a standard test system to study T&D interactions for high penetration of solar photovoltaic (PV) generation. The proposed test system can be used to study and propose solutions to problems such as reverse power flows and voltage control affected by PV variability. The proposed test system combines the transmission IEEE 118 bus system, with the distribution IEEE 123-node feeder. The original test systems are significantly enhanced by adding high penetration of solar PV generation with corresponding full-year minute-resolution chronological data. Conventional generation chronology is achieved by adding dispatch and unit commitment data for AC optimal power flow solutions. And chronological load data is added in both aggregated and disaggregated fashions. Sample applications of the data are provided highlighting voltage control challenges, and the proposed system is made available openly online.

Revised: September 15, 2020 | Published: April 23, 2018


Samaan N.A., M.A. Elizondo, B. Vyakaranam, M.R. Vallem, X. Ke, R. Huang, and J.T. Holzer, et al. 2018. "Combined Transmission and Distribution Test System to Study High Penetration of Distributed Solar Generation." In IEEE/PES Transmission and Distribution Conference and Exposition (T&D 2018), April 16-19, 2018, Denver, CO, 1-9. Piscataway, New Jersey:IEEE. PNNL-SA-128517. doi:10.1109/TDC.2018.8440238