What is CSI and VSI?

The two most common types of inverters are the current source inverter (CSI) and the voltage source inverter (VSI). As their names imply, current source inverters are fed with constant current, while voltage source inverters are fed with constant voltage.

What is VSI and CSI in inverter?

In voltage source inverter (VSI) input voltage is kept constant. VSI is fed from a DC voltage source having negligible or zero impedance. In current source inverter (CSI) input current is kept constant. CSI is fed with adjustable current source from a DC voltage source of high impedance.

What is VSI inverter?

Definition: A voltage source inverter or VSI is a device that converts unidirectional voltage waveform into a bidirectional voltage waveform, in other words, it is a converter that converts its voltage from DC form to AC form. An ideal voltage source inverter keeps the voltage constant through-out the process.

What is CSI inverter?

Definition: Current Source Inverter is a type of inverter circuit that changes the dc current at its input into equivalent ac current. It is abbreviated as CSI and sometimes called a current fed inverter. Here the input provided to the circuit is a stiff dc current source rather than dc voltage source.

What is VSI in power electronics?

Voltage source inverter (VSI) and current source inverter (CSI) are the conventional power inverters for DC–AC power conversion. They both suffer from the common limitation that they are either boost or buck converter and cannot be a buck–boost converter.

Lecture 19: VSI and CSI

What is VSC and CSC?

• Current-Source Converter (CSC) is a converter in which the DC-side current maintains the same po- larity; therefore, the direction of power flow is ad- justed by the DC-side voltage polarity. • Voltage-Source Converter (VSC), in contrast, keeps the same voltage polarity.

What are the 3 types of inverters?

There are 3 major types of inverters - sine wave (sometimes referred to as a "true" or "pure" sine wave), modified sine wave (actually a modified square wave), and square wave. A sine wave is what you get from your local utility company and (usually) from a generator.

What is PWM in inverter?

Pulse Width Modulation or PWM technology is used in Inverters to give a steady output voltage of 230 or 110 V AC irrespective of the load. The Inverters based on the PWM technology are more superior to the conventional inverters.

What are the advantages of CSI?

Improved quality of life: Solving socio-economic problems helps to improve the quality of life in communities. Better school facilities: Schools in poor communities receive better educational facilities. Job opportunities: CSI projects can provide job opportunities to unemployed individuals in communities.

What is difference between voltage source and current source?

The various types of sources available in the electrical network are voltage source and current sources. A voltage source has a forcing function of emf whereas the current source has a forcing function of current.

What is meant by V F control?

V/f control reduces the torque in low-speed operation with the primary resistance voltage drop even through it attempts to keep the torque stable regardless of the frequency.

What is input power factor?

Input power factor of the converter circuit is defined as the ratio of total mean input power to the total RMS input volt-amperes.

Why IGBT is used in inverter?

For solar inverter applications, it is well known that insulated-gate bipolar transistors (IGBTs) offer benefits compared to other types of power devices, like high-current-carrying capability, gate control using voltage instead of current and the ability to match the co-pack diode with the IGBT.

Why is PWM used?

PWM is used in many applications, ranging from communications to power control and conversion. For example, the PWM is commonly used to control the speed of electric motors, the brightness of lights, in ultrasonic cleaning applications, and many more.

What is the meaning of duty cycle?

Duty cycle is the proportion of time during which a component, device, or system is operated. The duty cycle can be expressed as a ratio or as a percentage.

What is MPPT in inverter?

An MPPT, or maximum power point tracker is an electronic DC to DC converter that optimizes the match between the solar array (PV panels), and the battery bank or utility grid.

What is classification of inverter?

Considering the classification based on the mode of operation, inverters can be classified into three broad categories: Stand-alone inverters (supplies stable voltage and frequency to load) Grid-connected inverters (the most commonly used option) Bimodal inverters (usually more expensive and are used less often)

Why are inverters rated in KVA?

why inverter rating in KVA? All the Switching Devices are rated for a certain Voltage and Current, so the real rating would always be in kVA ( Derived by by multiplying the two ).

What is VSC HVDC?

The Voltage Source Converter based High Voltage Direct Current(VSC-HVDC) is a new generation HVDC technology. Because of the technology of the PWM and the turn- on and turn-off electronic apparatus, VSC-HVDC could make up for the defective of the traditional HVDC.

What is LCC HVDC?

Most of the HVDC systems in operation today are based on line-commutated converters (LCC). The term line-commutated indicates that the conversion process relies on the line voltage of the AC system to which the converter is connected in order to effect the commutation from one switching device to its neighbour.

Why filters are used in HVDC?

An HVDC converter station always requires ac filters, the purpose of which is to mitigate voltage distortion and reduce telephone interference in the connected ac network. In addition the ac filters also play a vital part in reactive power support.

Can GTO be used in CSI?

Modern CSI drives typically use gate turn-off thyristors (GTOs) or symmetrical gate commutated thyristors (SGCTs), which are semiconductor switches that are turned on and off, creating a pulse width modulated (PWM) output with regulated frequency.

Is there a 3 phase inverter?

Three Phase Inverter

A three-phase inverter converts a DC input into a three-phase AC output. Its three arms are normally delayed by an angle of 120° so as to generate a three-phase AC supply. The inverter switches each has a ratio of 50% and switching occurs after every T/6 of the time T 60°angleinterval.

What is power factor in 3 phase?

Three-Phase Power Formula

This simply states that the power is the square root of three (around 1.732) multiplied by the power factor (generally between 0.85 and 1, see Resources), the current and the voltage.