Abstract
This paper studies the mechanism of spinning reserve on transient voltage stability in ultra-high voltage (UHV) DC/AC hybrid power grids. Taking an actual received power grid with an UHVDC system as an example, the transient voltage stability is introduced and a certain scale of spinning reserve has to be retained to keep the transient voltage stability of the system. And then, the steady state of synchronous generators with different spinning reserve is studied using the method of phasor diagram analysis. At last, the relation of spinning reserve, excitation voltage, and dynamic reactive power is analyzed and the mechanism of spinning reserve on transient voltage stability is revealed. The actual received power grid is used to demonstrate the validity of the mechanism.
Highlights
For full use of the large-scale renewable energy in the west of China, the ultra-high voltage direct current (UHVDC) transmission system is widely constructed [1]
The maximal reactive power under the two states is all limited by the maximal excitation voltage
The mechanism of spinning reserve on transient voltage stability in UHV DC/AC hybrid power grids is studied in this paper
Summary
For full use of the large-scale renewable energy in the west of China, the ultra-high voltage direct current (UHVDC) transmission system is widely constructed [1]. On the other hand, spinning reserve of synchronous generators (SG) is retained to enhance the dynamic reactive power output It helps to improve the transient voltage stability of received power grids with UHVDC systems. This paper is focused on the mechanism of spinning reserve on transient voltage stability in received power grids with UHVDC systems. Taking an actual received power grid with an UHVDC system in the centre of China as an example, a certain scale of spinning reserve are needed to keep the transient voltage stability. An actual received power grid with an UHVDC system in the centre of China is taken as an example to illustrate the transient voltage stability problem. Transient voltage instability of the actual grid would occur for insufficient supply of dynamic reactive power
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