Amirullah Ubhara Surabaya
Introduction
In addition to these features, the proposed multi-function transducer is capable of detecting islanding event and LVRT. A three-phase three-level bridge photovoltaic inverter H is connected to a 415 V distribution system, the equivalent model has impedance parameters (Zg).
Control strategy
Anti-Islanding Concepts and Implementations for multilevel inverter using CPT
Here, three levels of H-bridge are controlled to control the DC link voltages of each H-bridge cell supplied by MPPT, and also to compensate for non-linear load current distorting effects. It is important to note that there is no need for a reference frame transform or synchronization algorithm to provide the reference signals. The proposed three-level H-bridge is designed in the 𝑎𝑏𝑐 frame based on frequency response requirements.
Band pass filter
V Short circuit current of each
At night when there is no solar inverter becomes idle .to increase the utilization factor of system the same inverter will act as STATCOM mode.fig.10(a) and (b) shows the active and reactive power of the inverter, load and grid it is clear from fig. Fig.13 Mains voltage Vs, Mains current Is, Inverter current Iinv LVRT voltage, Detection signal and Frequency.
Conclusion
Lee “An Enhanced Grid Current Compensator for Grid-Connected Distributed Generation Under Nonlinear Loads and Grid Voltage Distortions,” IEEE Trans. Multi-task control strategy for grid-tied inverters based on Conservative Power Theory", IET Renew. Al-Durra, "Multi-task control strategy for asymmetric cascaded H-bridge inverter in microgrid applications," IEEE Trans.
34; Conservative Power Theory, a Framework to Approach Control and Accountability Issues in Smart Microgrids," IEEE Transactions on Power Electronics, vol. Khadkikar, "Night-time application of PV solar farm as STATCOM to regulate grid voltage," IEEE Transactions on Energy conversion, vol. Siavashi, “PV-STATCOM-A New Smart Inverter for Voltage Control in Distribution Systems,” IEEE Transactions on Sustainable Energy, 2018.
Dietmannsberger M, Grumm F, Schulz D, "Simultaneous Implementation of LVRT Capability and Anti-Islanding Detection in Three-Phase Inverters Connected to Low-Voltage Grids", IEEE-transaktioner om energikonvertering, vol.
REVIEW FORM
- Technical aspects
- Communications aspects
- Recommendation (Tick one) 1. Accepted without modifications
- Comments to the editors (These comments will not be sent to the authors)
8 the same as with all figures (t = 0 s to t = 1.5 s), (2) Both figures are unclear (blurred), please copy them directly from Matlab Figure to this paper, do not use the print screen menu or paint brush ( Page 10 ). 1) Please explain in more detail the results of your proposed model, i.e. 13 is too stiff, please widen this axis so that the figure is clearer, (2) This figure is unclear (blurred), please copy it directly from Matlab figure to this paper , do not use the print screen menu or paint brush, (3) Please explain in more detail the results of Mains Voltage Vs, Mains Current Is, Inverter Current Iinv LVRT Voltage in selected case (LVRT, Normal and Island Mode) and plot and mention significant nominal values base three modes and analyze them combined with these numerical results. 4) What is the novelty and contribution of your proposed method to assure the reader that this paper has a significant contribution, and illustrate this in a tabular basis on the previous researcher in references. This article only describes the best achievements of your proposed method, please add this section (conclusion) with future work to help the readers that your research has some weaknesses and is eligible to continue (Page 13).
Add your references to a minimum of 20 references and analyze additional references in the introductory section as well (Page 13).
OUTLINING HOW THE ISSUES ARE ADDRESSED
Reviewer # 1 Final
Recommendation
Accepted without modification
Accepted with minor corrections
Accepted with major modification
Rejected
8 the same as all images (t = 0 s to t = 1.5 s), (2) Both images are blurred (blurred), copy directly from Matlab figure to this paper, do not use print screen menu or brush. 13 is too tight, expand this axis to make the image clearer, (2) This image is unclear (blurry), copy them directly from the Matlab image to this paper, do not use the print screen menu or brush, (3 ) Please elaborate explain the results of line voltage Vs, Gr id current Is, inverter current Iinv. The LVRT voltage in the selected case (LVRT, normal and island mode) and the plot and mention of significant nominal values are based on the three modes and analyzed together with these image results. 4) What are the innovations and contributions of your proposed method to convince the reader that this article has an important contribution, and illustrate them in a table based on the previous researcher in the references.
Y Two shows the events, i.e. LVRT, Islanding and normal mode, so figure is made so that all quantities can occur simultaneously. This paper only describes the best achievements of your proposed method, please add this section (conclusion) with future work to help the readers that your research has some weaknesses and is eligible to continue. Add your references to a minimum of 20 references and analyze additional references in introduction section as well.
Reviewer # 2 Final
Reviewer # 3
Y Added more references (add more lines if necessary). Add more lines if necessary) Browser no. 4.
Final
System configuration
The proposed system is a single-stage transformerless application that not only improves system efficiency, but also reduces the weight and size of the overall system. The inverter is not only capable of injecting real power supplied by the PV array, but also compensates for the harmonics and reactive energy required by distribution networks. The proposed H-bridge inverter is used as a static synchronous compensator (STATCOM) in the time when there is no solar energy and the inverter is idle, and the entire volume of the inverter is used for STATCOM operation. The capacity of the proposed inverter is also monitored for critical system faults, which will be discussed in the next section.
System parameters used for simulation are listed in Table 1. Fig. 2 shows the flow chart of different operating modes of the presented system. Fig. 2 shows the flow diagram of the presented inverter control in night, day, LVRT and island mode. It is the spot that for general reactive energy is related through the frequency of the electrical network, whereas in conservative power theory, the reactive energy is freed from frequency, therefore it is precisely useful on. As given the descriptions available here, three basic decomposed components of the phase currents are given by
Conservative power theory additionally distinguishes the global power factor (λ) affected by the reactive power circulation (Q), load imbalances (N), and nonlinearities (D) of the system.
MATLAB Simulation results and its discussion
10, it is vivid that the inverter completely compensates the reactive power demand of the load, even though it supplies it with the essential active power. So the absorbed active power of the grid is reduced. Here, the inverter capacity is made slightly higher than the required load capacity, so in addition to supplying the required active power of the load inverter also supplies reactive power with residual capacity as explained in the flow diagram. At night, when there is no solar irradiation, the inverter becomes inactive, to increase the utilization factor of the system, the same inverter can be supposed to work in STATCOM mode. Fig. 11 and 12 show the performance of the system in STATCOM mode.
Active and reactive power of the grid, inverter and load in STATCOM operation mode of proposed system is shown in these two figures, at this time the active power demand of load is fulfilled by the grid and inverter supplies the entire load and grid reactive power required it appears clear from fig. To validate results presented in simulations, hardware prototype of the proposed system is developed in the laboratory shown in fig 17. Fig.18 shows grid voltage ( 𝑉𝑠𝑎) grid current ( 𝑖𝑠𝑎) and inverter current ( 𝑖𝑐𝑎) and charging current(𝑎) and in steady state with non-linear load and active filter operation. Fig.19 shows the dynamic performance of the proposed system for varying load conditions in PV mode.
The presented simulation and experimental results confirm the multifunctional performance of the proposed inverter with CPT control.
Conclusion
Al-Durra (2016), “Multifunctional control strategy for cascaded asymmetric H-bridge inverter in microgrid applications”, IEEE Trans. Khadkikar, (2009) "Nighttime Application of Solar PV Farm as STATCOM to Regulate Grid Voltage", IEEE Transactions on Power Conversion, Vol. Siavashi, (2018)"PV-STATCOM-A New Intelligent Inverter for Voltage Control in Distribution Systems", IEEE Transactions on Sustainable Energy,.
Vanderheide, (2015) "New control of PVsolar farm as STATCOM (PV-STATCOM) for increasing grid power transmission limits during night and day," IEEE Transactions on Power Delivery, vol. Implementation of LVRT Capability and Anti-Islanding Detection in Three-Phase Inverters Connected to Low-Voltage Grids”, IEEE Transactions on Energy Conversion, vol. Antenor Pomilio,( .2016) "Control of Single Phase Power Converters Coupled to Low Voltage Distorted Power Systems with Variable Compensation Objectives", IEEE Trans.
Pomilio (2016), “Control of single-phase current converters connected to low-voltage distorted power systems with variable compensation objectives,” IEEE Trans.
Journal of Engineering Science and Technology
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