一个新的模型减少方法基于电网连接的逆变器与LCL波器的PBC控制
1Department of Logistics Engineering College, Shanghai Maritime University, Shanghai, 201306, China. gaochunxiao@stu.shmtu.edu.cn.
Scientific reports
|September 13, 2024
概括
本研究引入了一种新的基于被动性的控制 (PBC) 方法,用于连接到电网的逆变器. 拟议的方法通过增加控制带宽来提高动态性能,特别是在弱电网条件下.
科学领域:
- 电气工程 电气工程
- 控制系统 控制系统
- 电力电子 电力电子 电力电子
背景情况:
- 由于时间延迟,LCL过电网连接逆变器 (GCI) 的传统基于被动性的控制 (PBC) 受到控制带宽的限制,导致动态性能差,特别是在弱电网条件下.
- 这种限制阻碍了电网连接的电力系统的效率和稳定性.
研究的目的:
- 提出一种新的基于被动性控制 (PBC) 方法,称为比例PBC (P-PBC),以增强闭环带宽并提高LCL过电网连接逆变器 (GCI) 的动态性能.
- 通过整合状态观察员来减少传感器要求并提高系统可靠性.
主要方法:
- 通过调整电网侧和逆变器侧电流之间的反比例系数来增加闭环带宽,开发了一种新的基于被动性的控制 (PBC) 策略 (P-PBC).
- 加入一个状态观察器来估计系统状态,从而减少所需传感器的数量.
- 实验验证是在使用dSPACE DS1202平台的110 V/50 Hz/3 kW三相系统上进行的.
主要成果:
- 拟议的P-PBC方法成功地增加了LCL过的GCI系统的闭环带宽.
- 实现了更好的动态性能,特别是在具有挑战性的弱电网条件下.
- 使用状态观察员有效地减少了传感器数量和相关成本,而不会影响可靠性.
结论:
- 拟议的P-PBC方法为LCL过的GCI提供了比传统PBC的显著改进,提供了增强的动态响应和稳定性.
- 在这些系统中,将状态观察员集成为降低传感器的成本效益和可靠解决方案.
相关概念视频
01:30Control of Power Flow
255
There are several methods to control power flow in power systems:
255
01:24Fast Decoupled and DC Powerflow
178
The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
178
01:18Reducing Line Loss
150
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss...
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss...
150
01:22Block Diagram Reduction
183
The process of deriving the transfer function of a control system often involves reducing its block diagram to a single block. This simplification can be achieved through a series of strategic operations, including relocating branch points and comparators. These operations preserve the overall function of the system while allowing for easier manipulation and combination of blocks.
The first step in this process is the identification and relocation of a branch point. A branch point, where a...
The first step in this process is the identification and relocation of a branch point. A branch point, where a...
183
01:26The Power Flow Problem and Solution
180
Power flow problem analysis is fundamental for determining real and reactive power flows in network components, such as transmission lines, transformers, and loads. The power system's single-line diagram provides data on the bus, transmission line, and transformer. Each bus k in the system is characterized by four key variables: voltage magnitude Vk, phase angle δk, real power Pk, and reactive power Qk. Two of these four variables are inputs, while the...
180
01:21Electrical Systems
376
In electrical engineering, the analysis of networks composed of passive linear components — resistors (R), capacitors (C), and inductors (L) — is fundamental. These components are organized into circuits where the relationship between input and output can be analyzed using transfer functions. The transfer function of an RLC circuit, which relates the voltage across a capacitor to the input voltage, can be derived using Kirchhoff's laws.
To derive the transfer function, consider...
To derive the transfer function, consider...
376