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Title: Continuation Power Flow Analysis for PV Integration Studies at Distribution Feeders

Abstract

This paper presents a method for conducting continuation power flow simulation on high-solar penetration distribution feeders. A load disaggregation method is developed to disaggregate the daily feeder load profiles collected in substations down to each load node, where the electricity consumption of residential houses and commercial buildings are modeled using actual data collected from single family houses and commercial buildings. This allows the modeling of power flow and voltage profile along a distribution feeder on a continuing fashion for a 24- hour period at minute-by-minute resolution. By separating the feeder into load zones based on the distance between the load node and the feeder head, we studied the impact of PV penetration on distribution grid operation in different seasons and under different weather conditions for different PV placements.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1411932
Report Number(s):
PNNL-SA-127635
SL0300000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Power and Energy Society Innovative Smart Grid Technologies Conference (ISGT 2017), April 23-26, 2017, Washington DC
Country of Publication:
United States
Language:
English
Subject:
PV Integration; distribution system; residential load; load disaggregation; AC Chronological Power Flow; clouds; indexes

Citation Formats

Wang, Jiyu, Zhu, Xiangqi, Lubkeman, David L., Lu, Ning, and Samaan, Nader A.. Continuation Power Flow Analysis for PV Integration Studies at Distribution Feeders. United States: N. p., 2017. Web. doi:10.1109/ISGT.2017.8086036.
Wang, Jiyu, Zhu, Xiangqi, Lubkeman, David L., Lu, Ning, & Samaan, Nader A.. Continuation Power Flow Analysis for PV Integration Studies at Distribution Feeders. United States. doi:10.1109/ISGT.2017.8086036.
Wang, Jiyu, Zhu, Xiangqi, Lubkeman, David L., Lu, Ning, and Samaan, Nader A.. 2017. "Continuation Power Flow Analysis for PV Integration Studies at Distribution Feeders". United States. doi:10.1109/ISGT.2017.8086036.
@article{osti_1411932,
title = {Continuation Power Flow Analysis for PV Integration Studies at Distribution Feeders},
author = {Wang, Jiyu and Zhu, Xiangqi and Lubkeman, David L. and Lu, Ning and Samaan, Nader A.},
abstractNote = {This paper presents a method for conducting continuation power flow simulation on high-solar penetration distribution feeders. A load disaggregation method is developed to disaggregate the daily feeder load profiles collected in substations down to each load node, where the electricity consumption of residential houses and commercial buildings are modeled using actual data collected from single family houses and commercial buildings. This allows the modeling of power flow and voltage profile along a distribution feeder on a continuing fashion for a 24- hour period at minute-by-minute resolution. By separating the feeder into load zones based on the distance between the load node and the feeder head, we studied the impact of PV penetration on distribution grid operation in different seasons and under different weather conditions for different PV placements.},
doi = {10.1109/ISGT.2017.8086036},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month =
}

Conference:
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  • In an earlier paper, the authors proposed an adaptive nonlinear SOR (ANSOR) algorithm for power flow analysis. A parallel version of ANSOR scheme was investigated on distributed memory (DM) machines. The algorithm was proven suitable for parallel environments due to its high speedups, reasonable number of iterations, and reliability to converge for heavily loaded large power systems. In this paper, the authors employ the ANSOR algorithm as a tool in the continuation power flow (CPFLOW) to study the voltage stability behavior when the load and generation vary. The main advantages of using the ANSOR scheme as an alternative over themore » Newton-Raphson (N-R) scheme are its computational speed via parallel implementation, and its reliability to generate the solution curve via the predictor-corrector schemes, as well as its simplicity to run the ANSOR program without any modification. The predictor, corrector, step size control, and parameterization schemes of the CPFLOW are described. The CPFLOW program is tested on the IEEE 14 and the Texas 2429 bus systems. Its parallel implementation of the Texas 2429 bus system is demonstrated on the nCUBE2 machine. Finally, the authors show that a CPFLOW using the parallel ANSOR scheme is competitive to the one using the N-R scheme.« less
  • Abstract not provided.
  • An increase in the number of inverter-interfaced photovoltaic (PV) generators on existing distribution feeders affects the design, operation, and control of the distribution systems. Existing distribution system analysis tools are capable of supporting only snapshot and quasi-static analyses. Capturing the dynamic effects of PV generators during the variation in distribution system states is necessary when studying the effects of controller bandwidths, multiple voltage correction devices, and anti-islanding. This work explores the use of dynamic phasors and differential algebraic equations (DAE) for impact analysis of PV generators on the existing distribution feeders.
  • This paper presents a method of finding a continuum of power flow solutions starting at some base load and leading to the steady state voltage stability limit (critical point) of the system. A salient feature of the so-called continuation power flow is that it remains well-conditioned at and around the critical point. As a consequence, divergence due to ill-conditioning is not encountered at the critical point, even when single precision computation is used. Intermediate results of the process are used to develop a voltage stability index and identify areas of the system most prone to voltage collapse. Examples are givenmore » wherein the voltage stability of a system is analyzed using several different scenarios of load increase.« less
  • This study examines the possible benefits of using D-STATCONs to dynamically regulate voltage on long distribution feeders that are limited by voltage regulation considerations. Specifically, the study compares the capability of voltage-limited feeders using traditional voltage regulators and switched capacitors with that of feeders using D-STATCONs located at strategic points on the line. It shows that the capability of a feeder (measured in MW-miles) which employs D-STATCONs may be considerably larger than that of a feeder with more traditional voltage regulating equipment (i.e., regulators and fixed or switched capacitors). In some instances, lines at the distribution voltage level equipped withmore » D-STATCONs may constitute a reasonable alternative to new or backup transmission.« less