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Distributed Generation source are widely used because of their remarkable advantages. Photovoltaic (PV) cells which produce DC voltage in their output belong to these sources and should be connected to the network through a power electronic interface. At the other hand, considering PV characteristics show that maximum power can be extracted at the optimal operating point which depends on the solar...
Multilevel converters and inverters have become the enabling power conversion technology for high voltage high power applications in today's power systems and large motor drives. Although the neutral-point clamped (NPC, a 3-level) inverter was invented in 1979, the multilevel concept was not formally established until the early 1990s when the diode-clamped multilevel inverter, the capacitor-clamped...
This paper presents a novel STATCOM configuration for voltage quality improvement in wind power generation systems. The proposed STATCOM is formed by cascading two 3-level inverters, `bulk inverter' and `conditioning inverter', through a coupling transformer. Both inverters are powered by dc-link capacitors and they are charged by a small amount of active power drawn from the grid. To minimize switching...
Photovoltaic (PV) module produces DC voltage, so it must be connected to the network through an inverter. Considering PV characteristics clear that maximum power is obtained in some specific operating points. These optimal points depend on the solar radiation as well as ambient temperature and vary with their changes. Therefore, DC-DC converter is usually used between PV module and inverter to keep...
In this paper a new combined multipulse-multilevel inverter topology is proposed for static synchronous compensator to regulate the ac bus voltage at a constant level. A closed loop controller for operating the STATCOM in the automatic voltage control mode is developed. To analyze the performance of the STATCOM connected in shunt with the transmission line, a single machine infinite bus power system...
To study and analyze the dynamic performance of the flexible AC transmission system (FACTS) devices, modelling of the FACTS devices is needed. Reactive power compensation is an important issue in the control of electric power systems. Reactive power increases the transmission system losses and reduces the power transmission capability of the transmission lines. Moreover, reactive power transmitted...
Dynamic VAR support is essential for grid support, particularly to help ride-through significant faults on the system. Conventional sources of VARs, such as capacitor banks and generators, respond too slowly to have the desired impact. Static VAR compensators (SVC) are faster, responding in 1/2 to 1 cycle, but offer reduced VAR support under fault conditions. STATCOMs are even faster, allowing for...
It has been mentioned in the literature that, among the multilevel inverter topologies used for STATCOM applications, the cascaded multilevel topology is the most advantageous and economical one. On the other hand, the main problem of this topology comes out to be the difficulty of sustaining the DC capacitors' mean voltages. This issue is very important for obtaining an output voltage with low THD...
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