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For medium- to high-voltage AC/AC conversion applications, direct AC/AC conversion scheme by adopting the modular multilevel converter (MMC) shows remarkable advantages on costs and efficiency compared with the AC/DC/AC solution which employs a back-to-back MMC configuration. However, direct AC/AC MMC suffers from branch energy instability when conversion frequencies of input and output are equal...
For medium- to high-voltage, high-power direct AC/AC conversion, modular multilevel converter (MMC) is a potential solution due to its outstanding features. However, MMC suffers from branch energy instability when frequencies of input and output are equal. This paper presents a single-phase five- branch MMC which is capable of direct AC/AC equal frequency conversion without branch energy stability...
This paper discusses a black-start field test performed with new strategy. The new strategy makes full use of the long time operation capability of pumped storage units in ultra-low load conditions and takes advantage of the double-bar configuration of most electrical stations, with black-start units only supplying the auxiliary load of itself and that of target units, enables a complete separation...
With the rapid development of power systems in China, the voltage/reactive power control becomes more and more important. The hierarchical voltage control is proved as an effective method to ensure the security, stability and economy of power systems. A secondary voltage intelligent control method and implement based on the fuzzy expert system is proposed in the paper. In order to augmenting voltage...
The hierarchical voltage control has been proved to be an effective method to ensure the security, stability and economy operation in power systems. The secondary voltage control is represented by the multiple objective linear programming with sensitive analysis in this paper. Several control objectives are considered. The first objective is that the pilot node voltage should be close enough to the...
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