Design of voltage stability monitoring simulation system for PV grid-connected system

Abstract

Voltage stability monitoring simulation system for photovoltaic (PV) grid-connected system is designed, taking the classic three-node power system model with a PV power station for example. The voltage instability theory and application researches for the monitoring simulation system are carried, and the frame, communication protocol and software functions of the voltage stability monitoring system are discussed. The monitoring simulation system can realize two-computer communication and joint debugging, which can not only monitor the basic operational aspects, but also be used to view the voltage equilibrium point curves and voltage response curves as the operating point is affected by various disturbances. And the system load margin index calculation, load shedding and other voltage stability remote control methods are provided to maintain or improve voltage stability. The monitoring simulation system provides a reference scheme for the application of voltage stability theory in practical engineering.

A static voltage stability index based on P-V curve for the medium-voltage distribution network with distributed PV

“…DPV can be regarded as a reversed load, and the DPV access point is usually a load node in the DN. The SVS can be analyzed by P-V curve method [5], and all load nodes have their own P-V curves. Figure 2 shows the P-V curve of the DPV access point, the horizontal coordinate is the load active power of the whole network (P) and the longitudinal coordinate is the voltage of the DPV access point (V r ).…”

“…In the early research stage of DN's voltage stability, it is mainly manifested as a static instability process with a long time span, therefore, the static voltage stability (SVS) accounts for a large proportion. The static voltage stability index (SVSI) can reflect the voltage stability level in the current operating state of the network to a certain extent, and realize the voltage stability online-monitoring [5,6].…”

Online Monitoring of Power Grid Intelligent Voltage Stability considering Potential Factors

“…e power consumption characteristics of the terminals connected to the power grid are periodic, so the load of the terminals fluctuates. is kind of fluctuation has no law to follow, for example, environmental interference and other factors will affect the voltage and form clutter in the line [22][23][24]. ese influences may affect the quality of power supply at a light level, or cause voltage collapse at a serious level, affecting the voltage stability of the smart grid.…”

Static voltage stability prediction for PCCs of new energy power stations in the grid-connected system

“…The bifurcation theory was also used to analyze the voltage stability in the new energy resources grid-connected system [3,6,7]. A prediction and control method was proposed for preventing the voltage instability in the 3-bus system containing a large PV, using several optimized SVM (Support Vector Machine) algorithms [8], and the schemes of voltage stability monitoring for the 3-bus system containing a large PV were discussed [9].…”