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Combined with the simple flow control method and low discharge energy of all vanadium battery energy storage system, this paper proposes a flow control method based on fuzzy algorithm to improve the energy efficiency of all vanadium flow battery energy storage system. Fuzzy controller which is applicable to the system is designed, charging and discharging power, SOC, frequency of the inverter are...
The comparison of the power stage dynamics between a conventional LLC converter and a three-level LLC converter is presented in this paper. The frequency response was similar in continuous current mode, but different in discontinuous current mode. Moreover, how the variation of circuit parameters affects the transfer function of the three-level LLC converter is studied. The experimental verification...
Recently, uncertainty in power system increase rapidly. On the other hand, the new construction of power plant or transmission line runs into opposition by the resistance of the local people. And those makes the power system operation more difficult. Because of those challenges new methodologies are required to gain the flexibility of the power grids. Flexible frequency operation provides customized...
The multilevel cascaded H-bridge converter is a favorable candidate to directly connect large-scale photovoltaic power plants to the medium voltage electricity network. Nevertheless, due to the lack of a common dc link, the unequal power generation among the three phases, primarily caused by non-uniform solar irradiance, affects its operation. The existing power balancing control methods, however,...
DC/DC resonant converter controlled with constant frequency by means of the additional transistors conduction time control is presented. The proposed converter topology allows to relatively high range of its output power changes in comparison to the conventional PRC converter. Comparison between average power losses in semiconductor elements in a DC/DC converter controlled with constant frequency...
a control model and control strategy of static frequency converter (SFC) for pumped storage power plant unit is presented. Control strategy of static start-up and its mathematical model is discussed in detail. And based on the 42 poles of synchronous machine p.u. parameters, simulation parameters of the machine are carried out. Then the control system simulation model of SFC is developed. Based on...
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