Abstract
Renewable energy sources such as wind power and photovoltaics (PVs) have been increasingly integrated into the power system through power electronic converters in recent years. However, power electronic converter-driven stability has issues under specific circumstances, for instance, modal resonances might deteriorate the dynamic performance of the power systems or even threaten the overall stability. In this work, the integration impact of a hybrid renewable energy source (HRES) system on modal interaction and converter-driven stability was investigated in an IEEE 16-machine 68-bus power system. In this paper, firstly, an HRES system is introduced, which consists of full converter-based wind power generation (FCWG) and full converter-based photovoltaic generation (FCPV). The equivalent dynamic models of FCWG and FCPV are then established, followed by linearized state-space modeling. On this basis, converter-driven stability analysis was performed to reveal the modal resonance mechanisms between different renewable energy sources (RESs) and weak grids in the interconnected power systems and the multi-modal interaction phenomenon. Additionally, time-domain simulations were conducted to verify the effectiveness of dynamic models and support the converter-driven stability analysis results. To avoid detrimental modal resonances, a multi-modal and multi-parametric optimization strategy is further proposed by retuning the controller parameters of the multi-RESs in the HRES system. The overall results demonstrate the modal interaction effect between the external AC power system and the HRES system and its various impacts on converter-driven stability.
Highlights
High penetration of converter-based power sources has become a popular trend due to its benefits in terms of environmental protection and social sustainability, especially the integration of wind power and photovoltaic (PV) solar energy in modern power systems [1,2]
According to the modal superposition theory in [20], modal interaction can be categorized into three types: (1) weak interaction which indicates the hybrid renewable energy source (HRES) system interacts very slightly with the AC power system and the interaction effect can be ignored while studying converter-driven stability; (2) modal resonance that drives adjacent oscillation modes to move against each and impairs the system damping and threatens converter-driven stability; and (3) modal counteraction that implies that the HRES system interacts positively with AC power system and improves the system damping
The converter-driven stability issues studied are in the form of modal interaction between two subsystems (i.e., HRES system and AC power system)
Summary
High penetration of converter-based power sources has become a popular trend due to its benefits in terms of environmental protection and social sustainability, especially the integration of wind power and photovoltaic (PV) solar energy in modern power systems [1,2]. Renewable energy sources are interconnected to the power system via flexibly controlled power electronic converters that might produce new stability issues due to the modal interactions between converter-based generators and the power system, such as converter-driven stability and resonance stability [5]. Oscillation issues could be induced by the modal interaction between converters and external AC power systems. Low-frequency power oscillations are normally caused by the modal interaction between the interconnection of power grids and the fast-response automatic voltage regulators (AVRs). The authors of [13] studied how system impedance and the parameters of the phase-locked loop (PLL) affect the dynamic behavior and the stability limits of the converters in HVDC applications
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