access icon openaccess Phasor model simulation of a grid integrated variable speed pumped storage system

This is an open access article published by the IET under the Creative Commons Attribution-NoDerivs License (http://creativecommons.org/licenses/by-nd/3.0/)
Received 14/10/2017, Accepted 01/11/2017, Published 01/01/2017

This study presents a phasor model simulation of a grid integrated variable speed pumped storage (VSPS) system focusing on generating mode. The VSPS is configured by the voltage sourced converter doubly-fed induction machine (DFIM) scheme. A wound rotor induction machine dynamic mathematical model and generalised averaging theory are adopted to derive the phasor model technique of the system. Based on the dq-axis synchronous reference frame concept, the direct power control strategy of the system is designed. The steady-state and transient stability responses of the proposed system are analysed in MATLAB/Simulink platform by considering a 300 MW/18 kV/50 Hz DFIM-based VSPS system and a grid consisting of two hydropower plants with synchronous generator, a diesel power plant with synchronous generator, a solar photovoltaic farm and fixed loads. A comparison of phasor model and detailed model simulations of the system is also conducted. The results show that the grid integrated VSPS system is stable without significant deviation in grid voltages, DC voltage and rotor speed of the DFIM unit under the designed control strategy. Moreover, the phasor model simulation achieves results with good accuracy as the detailed model, but with faster speed. Hence, the phasor model simulation is very effective for analysis and control design of large grid integrated VSPS systems.

Inspec keywords: solar power stations; diesel-electric power stations; rotors; power generation control; asynchronous machines; photovoltaic power systems; angular velocity control; pumped-storage power stations; control system synthesis; voltage-source convertors; power control; synchronous generators; power system transient stability; hydroelectric power stations; voltage control

Other keywords: synchronous generator; dq-axis synchronous reference frame concept; grid-integrated VSPS system; DFIM-based VSPS system; Matlab-Simulink platform; transient stability response; hydropower plants; voltage 18 kV; wound rotor induction machine dynamic mathematical model; power 300 MW; diesel power plant; solar photovoltaic farm; grid-integrated variable speed pumped storage system; generalised averaging theory; DC voltage; control design; phasor model simulation; voltage-sourced converter DFIM scheme; frequency 50 Hz; direct power control strategy; doubly-fed induction machine; steady-state stability response; rotor speed

Subjects: Pumped storage stations and plants; Asynchronous machines; Voltage control; Control system analysis and synthesis methods; Power convertors and power supplies to apparatus; Power and energy control; Diesel power stations and plants; Control of electric power systems; Synchronous machines; Solar power stations and photovoltaic power systems; Velocity, acceleration and rotation control

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