access icon free Improved practical method for low-inertia VSC-HVDC stability analysis in weak system

© The Institution of Engineering and Technology
Received 14/12/2019, Accepted 13/05/2020, Revised 23/04/2020, Published 18/05/2020

The physical mechanism of the instability of the low-inertia voltage source converter (VSC) caused by the phase-locked loop (PLL) in a weak system is clearly revealed in a simplified way. Based on the complex torque method, the joint influence of the PLL and the system strength on the VSC is studied through the defined key stable component. To keep the VSC stable, the value of the key stable component must be positive. The component is decided by AC voltage, short-circuit-ratio (SCR), reactive power, and PLL parameters. Improper PLL parameters and weak AC system could make the key stable component negative. To keep the VSC stable in a weak system, the PLL parameters can be adjusted according to the curve of the key stable component, which means suitably decreasing k p and increasing k i. Finally, simulations are implemented to validate the theory, which matches well with the findings.

Inspec keywords: phase locked loops; power system stability; power transmission control; HVDC power transmission; HVDC power convertors

Other keywords: improper PLL parameters; defined key stable component; weak AC system; complex torque method; Low-inertia VSC-HVDC stability analysis; AC voltage; improved practical method; VSC stable; low-inertia voltage source converter; weak system; physical mechanism; key stable component negative; system strength; phase-locked loop; reactive power

Subjects: Stability in control theory; Power convertors and power supplies to apparatus; Control of electric power systems; d.c. transmission; Modulators, demodulators, discriminators and mixers; Power system control

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