Hello all,
I designed a grid-connected PV system
The issue that I am facing is:
When the PV operates parallel to the Diesel Generator, the grid frequency is perturbed and increases above 1 p.u. How can I solve this issue?
Any reference? Please, I need an answer from an expert!
To avoid that, your PV system should function as a current source rather than a voltage source. you can check out the following paper in regard of grid connected system with optimized phase locked loop:
Article Grid-Connected PV System with Reactive Power Management and ...
Hi
To solve this problem, you need to adjust the parameters of the regulator used (usually PI), this regulator is intended to control the voltage reference generated by the grid (PLL) with the frequency of the injection inverter (PV) + you also need to see if you have controlled the speed of the diesel generator to follow the. Frequency reference.
Kind regards
You need to look at the droop characteristics of your generator(s). Injecting real power will lead to increasing the frequency of the system since this is a standalone system. One thing to do is to reduce the no load frequency of your system. and tune it to increase to rated value when both systems are connected.
I think Eyad gives a good explanation. Just to add some clarification, if adding power from a PV (presumably working in MPPT mode, current source injection), what the diesel gens "see" is a reduction of the overall load power, so frequency operation point (set by droop functions) increases.
The frequency of the system indicates the balance of generation and demand. When PV is added in parallel with a Genset, the overall system generation exceeds the demand. To avoid this problem, reduce the power generation of the Genset by the same amount that you added PV power to the system. Article Analysis of Fast Frequency Response Allocations in Power Sys...
Make sure the generated reactive power equal the load demand. Voltage and freq surge is a result of excesive generated reactive power
When a photovoltaic (PV) system operates parallel to a diesel generator, the grid frequency can be perturbed and increase above 1 p.u. 1. There are several approaches to solve this issue, including frequency-control methods, hybrid systems, and coordinated control methods.One approach is to use a frequency-control method. A simple fuzzy-based frequency-control method is proposed for the PV generator in a PV-diesel hybrid system without the smoothing of PV output1. Another approach is to use a hybrid system. A hybrid wind power with diesel generation is introduced since it is reliable because the diesel part takes over when the wind is not available3. An optimal design and dispatch of a system of diesel generators, photovoltaics, and batteries for remote locations is also proposed4.A coordinated control method for voltage and frequency regulation of a microgrid with a solar PV generator operating at MPP and backed up by battery energy storage systems is another approach5. The control methods are developed using a Proportional and Integral (PI) controller. The dissertation proposes a new coordinated control method for voltage and frequency regulation of a microgrid with solar PV including MPPT control and battery control5.In conclusion, there are several approaches to solve the issue of grid frequency perturbation when a PV system operates parallel to a diesel generator. These approaches include frequency-control methods, hybrid systems, and coordinated control methods.
1 Article A Frequency-Control Approach by Photovoltaic Generator in a ...
2 Article Integration of Large Scale PV-Based Generation into Power Sy...
3 https://scholarworks.calstate.edu/downloads/ks65hg00z
4 https://www.osti.gov/servlets/purl/1393847
5 https://trace.tennessee.edu/cgi/viewcontent.cgi?article=2954&context=utk_graddiss
Source : https://www.perplexity.ai/
- Badges
- Science topic
- Similar topics
- Engineering
- Control Theory
- Control Systems
- Control Systems Engineering