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相关概念视频

Control of Power Flow01:30

Control of Power Flow

283
There are several methods to control power flow in power systems:
283
Power Factor Correction01:20

Power Factor Correction

197
The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
197
Generator Voltage Control01:21

Generator Voltage Control

176
Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand,...
176
Maximum Power Flow and Line Loadability01:23

Maximum Power Flow and Line Loadability

131
The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
131
Load-frequency control01:28

Load-frequency control

181
Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...
181
The Power Flow Problem and Solution01:26

The Power Flow Problem and Solution

253
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...
253

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在联网光伏系统中提高电力质量:对三级和两级逆变器的模型预测控制进行比较分析.

Saliha Gada1, Arezki Fekik2, Miroslav Mahdal3

  • 1Laboratoire de Conception et Conduite des Systèmes de Production, Faculté de Génie Électrique et d'Informatique, Université Mouloud Mammeri, Tizi-Ouzou 15000, Algeria.

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概括

这项研究比较了两种太阳能逆变器类型,发现3级逆变器在连接到电网的太阳能发电系统中优越. 它在不同的太阳条件下提供更好的电源质量,降低总波扭曲 (THD).

关键词:
2L−3PVSI变频器的变频器3L-3PNPC变频器的变频器是什么代价功能 代价功能 代价功能有限集合模型 预测控制 预测控制增加的行为行为.最大的功率点跟踪跟踪.光伏系统光伏系统

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科学领域:

  • 电气工程 电气工程
  • 可再生能源系统可再生能源系统
  • 电力电子 电力电子 电力电子

背景情况:

  • 单阶段电网连接太阳能光伏 (SSGC-SPV) 系统对于有效利用太阳能至关重要.
  • 减少损失和安装成本是SSGC-SPV拓进步的关键驱动力.
  • 对不同逆变器配置的比较分析对于优化性能至关重要.

研究的目的:

  • 提供SSGC-SPV系统组件和控制策略的全面概述.
  • 为了比较两种逆变器类型的性能,二级三相电压源逆变器 (2L-3PVSI) 和三级三相NPC逆变器 (3L-3PNPC).
  • 评估用于逆变器控制的有限集模型预测控制 (FS-MPC) 的有效性.

主要方法:

  • 详细的系统组件:光伏发电机,逆变器,增量导电最大功率点跟踪 (IC-MPPT) 和PI调节器.
  • 对2L-3PVSI和3L-3PNPC逆变器使用相同的网格配置和辐射配置进行比较分析.
  • 实现了用于动态响应和当前跟踪的有限集模型预测控制 (FS-MPC),最大限度地降低了成本功能.

主要成果:

  • 3L-3PNPC逆变器表现出明显较低的总波扭曲 (THD),满足IEEE标准 (<5%) 在各种辐射级别.
  • 2L-3PVSI逆变器在200W/m2照射量时超过了5%的THD值.
  • 通过PI控制器,FS-MPC有效控制了两种逆变器类型,通过PI控制器保持615V的直流总线电压.

结论:

  • 3L-3PNPC逆变器配置优于电网连接的太阳能应用,因为其提高了电源质量.
  • FS-MPC是SSGC-SPV系统的合适控制策略,提供出色的动态性能.
  • 该研究强调了逆变器选择对于实现高质量的电力输入到电网的重要性.