Microgrid Power Flow Calculation Course Design

What is a microgrid (MG)?

1. Introduction A microgrid (MG) is a promising paradigm of electric power systems which integrates distributed generation (DG) units, energy storage systems and controllable loads to maintain the power supply in a defined area . The applications of power electronic devices in MGs have improved the flexibility of power system operation.

What are the different types of power flow calculation methods?

The commonly used power flow calculation methods include Forward–backward Sweep Method , Direct Solution , Modified Newton Method and Zbus Gaussian Method . All these methods involve iterative computation, which is the most time consuming part of the power flow calculation.

What is a power flow method?

It also means that it unable to obtain the consistent solutions for voltage magnitudes and phase angles of the whole nodes in a power system. The commonly used power flow calculation methods include Forward–backward Sweep Method , Direct Solution , Modified Newton Method and Zbus Gaussian Method .

Can a nodal power imbalance model be used to calculate power flow?

Based on a nodal power imbalance model for power flow calculation, we used penalized least squares to fit the constraints and construct a complete model for power flow calculation. Then, we transformed the model into a nonlinear least squares problem by calculating the initial values as the initial conditions for the subsequent algorithms.

What is probabilistic power flow?

Probabilistic power flow (PPF) is an effective method to evaluate the steady state of power systems with uncertainties [10]. The Monte Carlo simulation (MCS) [11], [12], [13], point estimate method (PEM) [14], [15], [16] and cumulant method (CM) [17], [18] are widely used in PPF calculation.

Does a two-step power flow solving algorithm provide a reliable adjustment scheme?

Therefore, we propose a two-step power flow solving algorithm to provide a reliable adjustment scheme when the grid current calculation is unsolved and computationally inefficient. Firstly, the penalized least squares method is used to fit the power balance constraint term to construct the extended power flow calculation model.