https://github.com/gkeiel/grid_tied_simulation
MATLAB-PSIM simulation and control of grid-tied inverters
https://github.com/gkeiel/grid_tied_simulation
inverter matlab psim simulation
Last synced: 8 months ago
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MATLAB-PSIM simulation and control of grid-tied inverters
- Host: GitHub
- URL: https://github.com/gkeiel/grid_tied_simulation
- Owner: gkeiel
- License: mit
- Created: 2025-08-23T00:25:38.000Z (10 months ago)
- Default Branch: main
- Last Pushed: 2025-08-23T01:11:58.000Z (10 months ago)
- Last Synced: 2025-08-23T03:29:18.690Z (10 months ago)
- Topics: inverter, matlab, psim, simulation
- Language: MATLAB
- Homepage:
- Size: 45.9 KB
- Stars: 0
- Watchers: 0
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# Grid-tied inverter simulation and analysis
A program for simulation and analysis of the output stage in grid-connected systems. Considering an grid-tied system consisting of a half-bridge voltage source inverter (VSI) and an output LCL filter, it allows evaluating the operation of such electronic device for high-frequency switching and under different load conditions.
The program contains the following file types:
- **MATLAB** scripts for general settings and controller design
- **Simulink** implementation for digital-control simulation
- **PSIM** implementation for power-electronics simulation
Main file named as 'run_grid_tied.m'.
## Current regulation
The current regulator in grid-connected inverters aims to maintain the current injected to grid at quality levels accepted by standards such as IEEE 1547. One solution for designing such output-current regulators are controllers based on the internal model principle (IMP), which in case of grid-tied inverters yield to the multi-resonant and repetitive controllers.
Consider a closed-loop in the form
employing a proportional-multiple-resonant (PMR) controller with transfer function
$$C(s) = \frac{u_v(s)}{e(s)} = k_{e} +\sum_{i=1,3,\dots}^{h}\frac{k_{{2i-1}} +k_{{2i}}s}{s^{2} +2\xi_{i}\omega_{r_i} s +\omega_{r_i}^{2}}$$
where $k_{e}$, $k_{{2i-1}}$, and $k_{{2i}}$ are gains to be determined, $\xi_{i}$ is the damping factor of the $i$-th resonant mode and $\omega_{r_i}$ the $i$-th multiple of the fundamental frequency $\omega_0$.
An appropriate design of $C(s)$, considering a sufficient number of resonant modes, results in grid-tied controllers allowing to perfectly follow a sinusoidal current reference and its harmonic frequencies when supplying non-linear loads.
The control law shown can be rewritten as
$$u(t) = Kx_{a}(t)$$
where $x_{a}(t) = [x'(t)\ x_{r}'(t)]' \in \mathbb{R}^{3+2h}$ is the augmented state where $x(t) = [i_L(t)\ v_c(t)\ i_o(t)]'$, $x_r(t)$ contains the resonant states and
$$K = [k_{c}\quad k_{v}\quad k_{g}\quad k_{1}\quad k_{2}\quad \cdots\quad k_{2h-1}\quad k_{2h}].$$