Static Voltage Stability Zoning Analysis Based on a Sensitivity Index Reflecting the Influence Degree of Photovoltaic Power Output on Voltage Stability

Sheng Li (), Yuting Lu and Yulin Ge
Additional contact information
Sheng Li: School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Yuting Lu: School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Yulin Ge: School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China

Energies, 2023, vol. 16, issue 6, 1-18

Abstract: The large-scale integration of photovoltaic (PV) power can bring a greatly negative influence on the grid-connected system’s voltage stability. To study the static voltage stability (SVS) of PV grid-connected systems, the traditional SVS index, L-index, was re-examined. It was firstly derived and proved that the PV active output P pv is proportional to the voltage phase angle of the PV station’s POI (Point of Interconnection), based on a simplified two-node system integrated with a PV station operating in PV (active power—voltage) mode or PQ (active power—reactive power) mode with unit power factor. Then a novel voltage stability sensitivity index LPAS-index was proposed that takes the derivative of the L-index with respect to the POI’s voltage phase angle, so as to reflect the influence degree of P pv on the SVS of each load node. A SVS zoning analysis method for the PV grid-connected system was designed according to the classification results of load nodes based on the proposed LPAS-index, the power grid can be zoned into three kinds of areas that reflect different correlations between the SVS and P pv : strong correlation, moderate correlation and weak correlation. Since the LPAS-index is less impacted by P pv , the SVS zoning results are relatively unchanged. On the basis of a classic 14-node system with PV, the practicability of the zoning analysis method was verified. The simulation results show that the PV access point in general falls within the strongly or moderately associated area with P pv . When most of the load nodes fall within the weakly associated area with P pv , it is not necessary to consider the impact of P pv and load power is still the main influencing factor on the SVS. In the multi-PV case, owing to the expansion of areas more affected by P pv , an excessive P pv can cause adverse influence on the SVS of the whole power grid; and an effective PV power-shedding measure is proposed to solve this problem. The proposed SVS zoning analysis method can be used for reference by power grid dispatchers.

Keywords: static voltage stability (SVS); photovoltaic (PV) active output; Point of Interconnection (POI); sensitivity index; zoning analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.mdpi.com/1996-1073/16/6/2808/pdf (application/pdf)
https://www.mdpi.com/1996-1073/16/6/2808/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:16:y:2023:i:6:p:2808-:d:1100434

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().