Abstract
Fixed speed wind turbine-squirrel cage induction generator (FSWT-SCIG)-based wind farms (WFs) are increasing significantly. However, FSWT-SCIGs have no low voltage ride-through (LVRT) and frequency control capabilities, which creates a significant problem on power system transient and steady-state stability. This paper presents a new operational strategy to control the voltage and frequency of the entire power system, including large-scale FSWT-SCIG-based WFs, by using a battery storage system (BSS). The proposed cascaded control of the BSS is designed to provide effective quantity of reactive power during transient periods, to augment LVRT capability and real power during steady-state periods in order to damp frequency fluctuations. The cascaded control technique is built on four proportional integral (PI) controllers. The droop control technique is also adopted to ensure frequency control capability. Practical grid code is taken to demonstrate the LVRT capability. To evaluate the validity of the proposed system, simulation studies are executed on a reformed IEEE nine-bus power system with three synchronous generators (SGs) and SCIG-based WF with BSS. Triple-line-to-ground (3LG) and real wind speed data are used to analyze the hybrid power grid’s transient and steady-state stability. The simulation results indicate that the proposed system can be an efficient solution to stabilize the power system both in transient and steady-state conditions.
Highlights
Wind energy is a clean energy, the use of which can avoid 5.6 billion tons of CO2 by 2050, equivalent to the yearly emissions of the 80 most polluting cities in the world, home to around 720 million people [1]
Necessitates mechanical bypass switches, bridge-type fault current limiter (BFCL) needs a large-scale coupling transformer, SVC offers voltage oscillations, STATCOM necessities a cut-off in a high-voltage drop, superconductor dynamic synchronous condenser (SDSC) is less effective for applications of low-voltage drops, unified power quality conditioner (UPQC) needs a large dc-link capacitor which increases the system cost, and unified compensation system (UCS) has high losses of conduction in the series bypass switch [16]
Analysisinvestigation has been completed on the same hybrid power system In this work, simulation
Summary
Wind energy is a clean energy, the use of which can avoid 5.6 billion tons of CO2 by 2050, equivalent to the yearly emissions of the 80 most polluting cities in the world, home to around 720 million people [1]. The total worldwide wind power capacity in 2015 was 432.9 GW, which is a summative market growth of more than 17% [2,3,4]. By 2030, wind power could exceed 2110 GW and supply up to 20% of worldwide power demands [4]
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