ZHU Lin,CHEN Da,ZHANG Jian,et al.Dynamic equivalent scheme for main grid of China Southern Power Grid considering feature constraints[J].Electric Power Automation Equipment,2019,39(09):206-212.
ZHU Lin,CHEN Da,ZHANG Jian,et al.Dynamic equivalent scheme for main grid of China Southern Power Grid considering feature constraints[J].Electric Power Automation Equipment,2019,39(09):206-212.DOI: 10.16081/j.epae.201909008.
Dynamic equivalent scheme for main grid of China Southern Power Grid considering feature constraints
The constant development and change of China Southern Power Grid put forward higher requirements for dynamic equivalence,so the equivalent scheme of the system must consider the influence of feature changes. The influence of the support capacities of AC systems,the asynchronous operation modes and the grid-integration of high proportion of renewable energy on dynamic equivalence is analyzed,and the corresponding equivalent principles are put forward. Taking China Southern Power Grid as the example,an optimal equivalent scheme of main grid framework considering feature constraints is proposed. The support strength of AC system is determined by MIESCR(Multi-Infeed Effective Short Circuit Ratio) and the equiva-lent retention range is modified. Considering the restriction of connection mode and electrical distance,a new division principle of coherent generator group is proposed. Then the parameters of the equivalent governors are adjusted to make its frequency characteristics same as before,and the renewable energy generators are reasonably grouped and equivalent to retain their dynamic characteristics. The equivalent scheme is verified and evaluated according to the proposed evaluation standard. Simulative results show that the key influencing factors are reasonable and necessary. Compared with the traditional schemes,the proposed equivalent scheme is more reasonable and effective.
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