Simlink simulation of IEEE33 power grid system

Table of contents

2. Simulink modeling of IEEE 33 power grid

1. IEEE 33 Power Grid Overview

The power system is one of the national infrastructures, providing energy and security for social production and life. Nowadays, with the rapid development of social economy, the demand for electricity continues to increase. The operation and control of power systems face many challenges, such as grid security, supply reliability, energy efficiency and other issues. These issues have become bottlenecks in power system design and operation.

The IEEE 33-node distribution network is a node-type power distribution system, which consists of 33 nodes, including three substation nodes and 30 load nodes. Its main function is to transfer electrical energy from the power source to the final load. The IEEE33-node distribution network is a standard power network example and is widely used in the fields of power system scientific research and power system engineering design. In the IEEE33-node distribution network, three substation nodes receive the electric energy transmitted in high-voltage transmission lines and step it down to a voltage level suitable for distribution. Then, it is transmitted to the load node through cable or wire lines to supply the power demand. Through the design and implementation of this system, goals such as optimizing load management, improving power supply reliability, and reducing losses can be achieved.

The IEEE 33 power grid system is a common power system. Its basic principle is to use power electronics technology to convert and distribute electrical energy in the AC grid to meet the power needs of different devices. The system mainly consists of the following parts:

1.1 Rectifier

Convert AC power to DC power to provide power to DC loads or provide DC input to an inverter. Rectifiers generally use three-phase rectifier circuits, and their mathematical formulas are as follows:

Vi = Ed/π√2 + Edjωt + VZjωt (1)

Among them, Vi is the rectifier input voltage, Ed is the rectifier DC output voltage, ωt is the time variable, and VZ is the rectifier output impedance.

1.2 Inverter

Convert DC power to AC power to provide power to AC loads or integrate it into the power grid. The inverter generally uses a three-phase bridge inverter circuit, and its mathematical formula is as follows:

Vab = Ed/π√2sinωt + VZjωt (2)

Among them, Vab is the inverter output voltage, Ed is the inverter DC input voltage, ωt is the time variable, and VZ is the inverter output impedance.

1.3 Control unit

The control unit is the core of the IEEE 33 power grid system. Its main function is to control the switching devices of the rectifier and inverter by collecting voltage, current and other parameters of the power grid and load to achieve the conversion and distribution of electric energy. The control unit can use a variety of algorithms, such as PID, fuzzy control, etc.

1.4 Energy storage unit

The energy storage unit is an important part of the IEEE 33 power grid system. Its main function is to store electrical energy to cope with load changes or grid failures. Energy storage units can use a variety of energy storage methods, such as supercapacitors, batteries, etc.

The advantages of the IEEE 33 power grid system include: it can realize two-way flow of electric energy, high conversion efficiency, can be integrated into the power grid for operation, high reliability, and low maintenance cost. The system has a wide range of applications, such as smart home, industrial automation, electric propulsion and other fields. However, the IEEE 33 power grid system also has some shortcomings, such as harmonic pollution, electromagnetic interference and other problems that need to be solved. up2223

2. Simulink modeling of IEEE 33 power grid

In Simulink, we can build corresponding models based on the principles and structure of IEEE 33 power grid. The following is an introduction to the Simulink modeling steps and related principles of a basic IEEE 33 power grid system.

Build a model: Create a new model in Simulink, and then select the required modules from the module library. The required modules generally include rectifiers, inverters, control units, etc.
Configure module parameters: Configure the parameters of the rectifier and inverter, such as switching frequency, DC voltage, etc. At the same time, set the algorithm and control parameters of the control unit.
Establish a power grid model: Use the power grid module in Simulink to establish a power grid model in the IEEE 33 power grid system, including three-phase AC power supply, loads, etc.
Connection module: Connect rectifiers, inverters, control units and other modules, and connect the grid model as needed.
Configure simulation parameters: Set the simulation time, step size and other parameters, and then start the simulation.

After the model is built, the performance of the IEEE 33 power grid system can be optimized by changing the control algorithm and parameters. In addition, the dynamic performance and stability of the IEEE 33 power grid system can be analyzed through simulation. During the modeling and simulation process, the mathematical formulas in section 1 can be converted into corresponding Simulink modules and algorithms for implementation. For example, you can use the "Three-Phase PWM Converter" block in Simulink to replace the rectifier and inverter, and use the "Control System" block to implement the control unit's algorithm. At the same time, you can use the "Three-Phase Power System" module to build a power grid model, and use the "Simulink Power Flow" module to simulate and analyze the power grid. As shown below:

It should be noted that the IEEE 33 power grid system is a relatively complex system, and the modeling and simulation process requires careful thinking and debugging. Therefore, in practical applications, the model needs to be continuously optimized and improved to adapt to different application scenarios and needs.