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Grid-connected photovoltaic power generation system electromechanical transient model based on power decoupling control

A photovoltaic power generation system and power decoupling technology, applied in the field of electromechanical transient models of grid-connected photovoltaic power generation systems, can solve problems such as lack of complete consideration of protection means and measures, complex inner and outer loop control systems, and difficult parameter adjustment.

Active Publication Date: 2014-08-20
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (1) The dq decoupling control it adopts actually continues the idea of ​​electromagnetic transient simulation, the inner and outer loop control system is complicated, and the parameter adjustment is not easy;
[0006] (2) The model does not fully consider various protection means and measures;

Method used

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  • Grid-connected photovoltaic power generation system electromechanical transient model based on power decoupling control
  • Grid-connected photovoltaic power generation system electromechanical transient model based on power decoupling control
  • Grid-connected photovoltaic power generation system electromechanical transient model based on power decoupling control

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Embodiment Construction

[0138] Please refer to figure 1 as shown, figure 1 It shows the overall structure of this model, including photovoltaic cell unit, maximum power tracking unit, DC voltage stabilization unit, active loop, reactive loop, and output link. The input of the photovoltaic cell is the temperature T, the maximum power point current I m , short-circuit current I sc , maximum power point voltage U m , open circuit voltage U oc , initial power P G0 and battery outlet voltage U pv , the variable output to the DC voltage regulator is the photovoltaic cell current I pv , Photovoltaic cell power P pv ; The input of DC regulator link is I pv ,P pv , U mm , active power P and reactive power Q, the variable output to the photovoltaic cell is U pv , the variable output to active loop and reactive loop is U dc ;The input of the active loop is U dc , The DC side reference voltage U calculated by MPPT dcref and inverter outlet side voltage U i , the variable output to the DC voltage r...

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Abstract

The invention discloses a grid-connected photovoltaic power generation system electromechanical transient model based on power decoupling control. The grid-connected photovoltaic power generation system electromechanical transient model based on power decoupling control is characterized by comprising a photovoltaic battery unit, a maximum power tracking unit, a direct current voltage stabilizing unit, a PQ decoupling control unit and a protective configuration unit, wherein the output end of the photovoltaic battery unit is connected with the input end of the direct current voltage stabilizing unit, the output end of the direct current voltage stabilizing unit is connected with the input end of the photovoltaic battery unit and the input end of the PQ decoupling control unit, the output end of the PQ decoupling control unit is connected with the input end and the output link of the direct current voltage stabilizing unit, the output end of the maximum power tracking unit is connected with the input end of the photovoltaic battery unit, the input end of the direct current voltage stabilizing unit and the input end of the PQ decoupling control unit, and the protective configuration unit is connected with the output link. The grid-connected photovoltaic power generation system electromechanical transient model based on power decoupling control is suitable for transient stability calculation in the electromechanical transient simulation process of the power system, can analyze the transient stability of a photovoltaic access system, and can study the reactive voltage problem of part of the power grid.

Description

technical field [0001] The invention relates to the technical field of electric power transmission and distribution, in particular to an electromechanical transient model of a grid-connected photovoltaic power generation system based on power decoupling control. Background technique [0002] Photovoltaics, a new form of energy, is increasingly connected to the grid, and its impact on the power system cannot be ignored, especially in local power grids and micro-grids, where it will play a very important role. After the photovoltaic power generation system is connected to the grid, due to the randomness of its output and the transient characteristics different from the traditional power supply, it will inevitably cause various new impacts on the power system. Therefore, it is particularly important to establish a grid-connected photovoltaic power generation system model suitable for electromechanical transient stability analysis. And considering the characteristics of electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38G06F17/50
CPCY04S10/545Y02E60/76Y02E40/76Y02E10/58Y02E10/563Y04S40/22Y02E10/56
Inventor 王琦焦在滨刘琳康小宁
Owner XI AN JIAOTONG UNIV
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