PV Grid | Harmonic Mitigation in Grid connected PV using Shunt Active Filter | Shunt Active Filter
Summary
TLDRThis educational video discusses the simulation model for harmonic mitigation in grid-connected photovoltaic (PV) systems using a synchronous power filter. It covers the PV array, inverter, and LCL filter setup, with a focus on the control mechanisms like MPPT, field-oriented control, and PQ theory. The video demonstrates the impact of adding a non-linear load and the effectiveness of the synchronous power filter in reducing Total Harmonic Distortion (THD) in the grid current, ensuring it meets standards.
Takeaways
- 🌞 The video discusses a simulation model for harmonic mitigation in a grid-connected photovoltaic (PV) system using a synchronous power filter.
- 🔌 The model includes a PV array, a boost converter, an inverter, an LCL filter, and a synchronous power filter to connect to the grid.
- 🔋 The PV array has a rating of 100.2 kilowatts, with 47 power strings, each consisting of 10 series-connected modules, with a maximum power point voltage of 29 volts.
- 🚀 The boost converter is controlled by a maximum power point tracking (MPPT) algorithm, which takes PV voltage and current as inputs and outputs a reference voltage.
- 🔄 The three-phase inverter is controlled using a voltage and current controller, with field-oriented control (FOC) and decoupling techniques employed.
- 🔗 The PLL (Phase-Locked Loop) generates the frequency and phase reference, converting grid voltage and inverter current into a DQ0 format for control.
- 🔵 The DC link voltage is maintained at 700 volts, which is the decoupling voltage of the inverter, ensuring stable operation.
- 🌐 The grid has a voltage of 400 volts and a frequency of 50 Hz, with a non-linear load represented by a diode rectifier with an RL load.
- 🛠️ The synchronous power filter uses a three-phase inverter, an inductor, and a voltage controller, with compensating current calculated using PQ control theory.
- 📊 The video demonstrates the simulation process, starting without a non-linear load, then including it, and finally adding the synchronous power filter to mitigate harmonics, with the Total Harmonic Distortion (THD) of the grid current being a key metric of performance.
Q & A
What is the main topic of the video?
-The main topic of the video is about harmonic mitigation in a grid-connected photovoltaic (PV) system using a synchronous power filter.
What components are included in the simulation model discussed in the video?
-The simulation model includes a PV array, a boost converter, an inverter, an LCL filter, a grid, a synchronous power filter, and a non-linear load.
What is the rating of the PV array in the simulation?
-The PV array rating in the simulation is 100.2 kilowatts.
How is the boost converter controlled in the simulation?
-The boost converter is controlled by means of a Perturb and Observe (P&O) MPPT (Maximum Power Point Tracking) algorithm.
What is the role of the inverter in the system?
-The inverter converts the DC power from the PV array to AC power suitable for the grid, and it is controlled by voltage and current controllers using a field-oriented control concept.
What is the purpose of the synchronous power filter in the system?
-The synchronous power filter is used to mitigate harmonics in the grid current, ensuring that the current waveform is sinusoidal and meeting grid standards.
How is the non-linear load represented in the simulation?
-The non-linear load is represented by a diode rectifier with an RL load in the simulation.
What is the Total Harmonic Distortion (THD) of the grid current before the addition of the synchronous power filter?
-Before the addition of the synchronous power filter, the THD of the grid current is around 3.63%, which is less than 5% and thus follows the grid standards.
What happens to the THD of the grid current after adding the non-linear load?
-After adding the non-linear load, the THD of the grid current increases to around 7.23%, which is more than the 5% standard and indicates current distortion.
How effective is the synchronous power filter in reducing the THD of the grid current?
-The synchronous power filter effectively reduces the THD of the grid current to 4.85%, which is less than 5% and meets the grid standards.
What is the significance of the THD value being less than 5% in the context of the grid?
-A THD value less than 5% signifies that the current waveform is close to sinusoidal, which is essential for maintaining the stability and quality of the electrical grid.
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