Reliability Prediction of New Improved Current Source Inverter (CSI) Topology for Transformer-Less Grid Connected Solar System
Kalyani C. Potdukhe
Department of Electrical Engineering
Yeshwantrao Chavan College of Engineering. Nagpur, India. kalyani.potdukhe@gmail.com Mr. A. P. Munshi
Department of Electrical Engineering Yeshwantrao Chavan College of Engineering. Nagpur, India. aniketmunshi@gmail.com Mrs. A. A. Munshi
Department of Electrical Engineering
Rajiv Gandhi College of Engineering. Nagpur, India. aam.nyss@gmail.com
Abstract— Solar inverters are mainly classified as voltage source based solar inverter and current source based solar inverter. The comparison of voltage source inverter (VSI) and current source inverter
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Time for CSI. The reliability of CSI is calculated in Ground Benign Environment. Figure 7. Reliability curve of CSI.
The reliability of CSI is found to be 96.48%. The overall failure rate of CSI is found to be 4.0937e-006 hours/failure and its MTBF is found to be 0.24432e+006 Hours. It can also be seen from the curves of VSI and CSI that in case of CSI, the reliability reduces exponentially but doesn’t go to zero in 100 years unlike VSI.
C. Reliability Analysis of Proposed CSI
Fig.8 below shows the reliability block diagram of new improved proposed CSI topology represented by circuit in Fig. 3. All the components of CSI in Fig. 8, are assumed to be connected in series from reliability point of view.
Figure 8. Reliability Block Diagram of Proposed CSI
Table 7 shows the failure rate models of components of proposed CSI and base failure rates are given in table 8
TABLE 7. FAILURE RATE MODEL OF COMPONENTS IN PROPOSED CSI
Components Failure Rate Model
Inductor (L) λL= λLb πC πQ
• Then the fault cable is tested to determine the type of fault, 18 KV is applied on each phase for 5 minutes, if the phase can carry this voltage, so this phase is good and no fault on it, if the phase cannot withstand this value of voltage, this means that the insulation is damaged and this phase is faulty, If one or more phase cannot withstand the 18 KV then these phases are faulty and the type of fault is short circuit due to breakdown of the insulation, but if the phases withstand the 18 KV applied but the current from the sending end not reach the other end, this means that there is an open circuit fault which is may be break in the conductor or the joint connecting the
7 and Fig. 8, the impacts SSSC and its POD would be displayed through the reducing the oscillation of power flow for both active and reactive power. The POD of SSSC checks the Vqref and injects voltage to reduce the variation in power
Measure the capacitance of the open-ended coaxial cable 3. Determine Ra and Rb to meet the amplitude and time constant specifications. 4. Measure the Gain and time constant (Tau), and compare the the measured data with the calculated data, which based on experiments. Instructions: 1.
555 is a very commonly used IC for generating accurate timing pulses. It is an 8 pin timer IC and has mainly two nodes of operation: mono-stable and a-stable. In external resistor and capacitor whereas in a-stable mode the frequency is controlled by two external resistors and a capacitor. It has a frequency of about 100 Hz [1]. The CD4033 has provisions for automatic blanking of the non-significant zeros in an easily readable display consistent with normal writing practice [2].
Existing basic unit is shown in fig.2.1. As shown in fig.2.1, the basic unit consist of three dc voltage sources and five unidirectional power switches. In this structure, power switches (S_2,S_4),(S_1,S_3, S_4, S_5), and (S_1,S_2,S_3, S_5) should not be simultaneously turned on in order to protect the dc voltage sources from the short circuit. Table 2.1 shows the existing basic unit power switches turn on and off states, where the basic unit is able to generate three different voltage levels at the output that is 0, V_1+V_3, and V_1+V_2+V_3. It is important to note that the basic unit is only able to generate positive levels at the output.
Unit: 9/ P1 1. Various Network Topologies: Star: Star topology is used to connect all computers to a central switch, which is responsible for forwarding the data to its destination computers. As shows in the diagram below: This type of topology is used with Ethernet and frame relay.
All KFUPM/ACHB examination regulations apply. Course: EE315: PROBABILISTIC METHODS IN ELECTRICAL ENGINEERING Semester-year: 131-2013-2014 Day-Date: THURSDAY November 14, 2013 Start time: 07:30 AM Finish time: 09:00 AM Instructor Name Dr. Belloui Bouzid Signature General Information to Students: Read and follow the instructions for each question carefully.
On 4/18/20 SC completed a monitoring telephone call with Pa. SC asked Pa how is he doing and he reported that he is doing well. The Pa reported that his knees gave out as he was walking to walk up the steps, but no injuries were reported and the Pa did seek any medical treatment. The SC asked the Pa if anyone was present and if so who, and asked if the person (if any) helped him up. The Pa reported that his girlfriends were present and she helped up.
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The testing of the linear WEC was split into three main sections the first being electrical/electronic systems, the second being mechanical systems and finally complete system tests. 5.2 Electrical and Electronic Tests and Results 5.2.1 Preliminary Test Conditions Schematic Check
1.2.1 Passive BMSs-switched shunting resistor balancing Shunting resistor passive BMSs are the most straightforward cells SOC balance concept. They are based on removing the excess energy from the higher voltage cell(s) by bypassing the current of the highest SOC cell(s) and wait to until the lower SOC cell(s) to be in the same level. The shunting resistor methods can be categorized into two methods as shown in Fig. 2.
3) Write down the detail report for testing the semiconductor circuits by using two different methods. Figure-1 DC Power Supply Circuit Figure-2 Single Stage Amplifier 3.1 Introduction This task was a part of unit 39- Electronic Principles; assignment -1 at Uxbridge College (UK) dated from 29/11/2013 to 20/12/2014 for second year students.
It uses things such as well-known volcanic eruptions. Peaks in Sulfate can be used to identify the input. In 1815, Krakatoa erupting causing the year without a summer. If we ever forget what
What is Reliability and Validity? Reliability is the degree to which an assessment consistently measures whatever it measures (John, 2015). The students can be tested through whatever that they are measure with, as long as everyone have at least the same score no matter when or where they take the test.
wind energy and solar energy are both renewable types of energy they create no pollution and are fully sustainable as they are both powered by natural sources and if there is no wind one day the solar panels can generate energy and if it 's cloudy another day the windmills can generate energy also the energy created during the summer can be sold to the grid for extra capital that can be used for field trips, renovations, etc. Geothermal heating systems are rated the most efficient and eco-friendly heating systems. The system works using buried coils that contain a liquid, typically a mix of water and antifreeze. The liquid is warmed to the same temperature as the earth and then runs through to the home where a compressor extracts the heat but not only that geothermal heating requires no fossil fuels so it is very eco-friendly LED lighting is an efficient and eco friendly lighting alternative because they waste much less energy in converting to light compare to incandescent lights which waste 90% of the energy to convert to heat not only that LED lights last up to 15-25 times longer that traditional light bulbs this makes LED a much better source of lights than others because it wastes less energy and it is more efficient at doing its job this is so much better for the environment because it uses less energy that other lighting sources