S YNCHRONVERTERS:I NVERTERS THAT MIMIC SYNCHRONOUS GENERATORS
Qing-Chang Zhong Dept.of Electrical Eng.&Electronics The University of Liverpool
UK
Email:**************.uk
George Weiss
Dept.of Electrical Eng.Systems Tel Aviv University
Israel
E-mail:**************.ac.il
Outline
Motivation and relevant works
Modelling of synchronous generators
Implementation of a synchronverter
Operation of a synchronverter
Simulation results
Experimental setup and results
Potential applications
Motivation
Increasing share of renewable energy
UK:20%by2020
EU:22%target for the share of renewable energy
sources and an18%target for the share of CHP in
electricity generation by2010
Regulation of system frequency and voltage:Currently
most inverters feed currents to the grid and do not take part
in system regulation and there is a need of voltage
controlled inverters to connect with weak grids.
Threat to power system stability:Inverters have different
dynamics from conventional synchronous generators
The need of smooth transition of knowledge
Our solution
reactive to
Synchronverters:Inverters that mimic
synchronous generators
Operate voltage source inverters to mimic
synchronous generators
The energyflow between the DC bus and the AC
bus changes direction automatically according to
the grid frequency
Take part in the power system regulation of
frequency and voltage:the same as synchronous
generators(externally)
Dynamically behave like synchronous generators
(internally)
Relevant works
Virtual synchronous machine(VISMA)by Beck and Hesse
The voltages at the point of common coupling with the grid are measured to
calculate the phase currents of the VISMA in real time.
These currents are used as reference currents for a current-controlled inverter.If the
current tracking error is small,then the inverter behaves like a synchronous
machine,justifying the term VISMA.However,a synchronous generator is a
voltage source.
The grid integration using control algorithms for SG was left as future work
Virtual synchronous generator(VSG)by VSYNC
Add a short-term energy storage system to provide virtual inertia
The inverter itself does not have the dynamics of a synchronous generator
Frequency/voltage drooping
and by Sao and Lehn

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