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Bidirectional AC/DC power conversion has become very essential for any power electronic based industry. Pulse Width Modulated (PWM) Converters can be suggested as the best solution for rectifier as well as inverter modes of operation to achieve bidirectional power flow. In rectifier mode of operation, the converters are controlled to deliver regulated and ripple free DC output with high quality of...
The power generated by a solar photovoltaic (SPV) system depends upon the solar radiation level and cell temperature. A suitable maximum power point tracking (MPPT) algorithm is required to extract the maximum power from the SPV. However at a partial shading condition (PSC) the conventional MPPT techniques may lead to the operation at a local maximum power point (LMPP) instead of global maximum power...
This paper describes a Sliding mode control (SMC) technique for a single - phase grid connected voltage source inverter (VSI) through LCL filter for distributed generation applications. SMC technique is applied as a control method with a fixed band hysteresis controller. Mathematical modeling of the VSI circuit is done through state space analysis. This control method provides robust current voltage...
Current-Controlled Pulse Width Modulated (CCPWM) Voltage Source Inverters (VSIs) receive an extensive coverage in high performance drives because of the sovereign dynamic feedback and essential over-current protection, juxtaposed with the voltage-Controlled PWM (VC-PWM) VSIs. Here a new Current Error Space Vector (CESV)based constant switching frequency hysteresis controller which get rid of the boundary...
A multiple feedback control system developed for three phase three level neutral point clamped (NPC) pulse width modulation (PWM) voltage source front end converter (FEC) is presented. This technique does not require any load information. A forced switching technique is used to operate the converter at constant frequency. The system is modeled and multiple feedback control system is developed using...
Hysteresis current control (HCC) based voltage source converters (VSCs) have several advantages like good dynamic response, over-current protection, insensitive to load parameter variation and ease of implementation. The application of HCC technique for two-level VSCs are well established and few modifications of the same are also reported to operate with variable or constant switching frequency in...
Increased size and capacity of individual wind turbine has posed a major challenge for high power conversions. For this scenario advanced multilevel converter topologies and parallel operation of Active Front End (AFE) rectifiers are gaining popularity. But there are issues on reliability and complicacy of control and operation of active power electronic devices at such high power. The Passive Front...
This paper proposes three-level flying capacitor inverter based distribution static compensator (DSTATCOM) for shunt applications. Also, two new floating capacitors voltage balancing schemes using loss balancing technique have been proposed to balance capacitor voltages. Because of benefits like simplicity, transformation less implementation, and scope of desired power factor setting; a generalized...
Reactive current compensation is a method to improve the load power factor by locally supplying the reactive current requirement of the load using shunt compensators. Current controller of shunt compensators is usually designed using conventional PI controllers, in spite of the improved dynamic performance offered by hysteresis controllers. Conventional hysteresis current controller brings up different...
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