Impacts of photovoltaic power variation under clouds and LVRT tield test on central power grid of Tibet

2017 ◽  
Author(s):  
Dawei Zhao ◽  
Minhui Qian ◽  
Deshun Wang ◽  
Yanzhang Liu ◽  
Lingzhi Zhu ◽  
...  
Keyword(s):  
Power Grid ◽  
Power Variation ◽  
Photovoltaic Power

scholarly journals Research on Transient Overvoltage Suppression Measures for Photovoltaics Connected to the DC Sending End in the Smart Power System for Industry 4.0

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Shuanbao Niu ◽  
Xianbo Ke ◽  
Qiang Shen ◽  
Chao Huo ◽  
Ning Chen ◽  
...  
Keyword(s):  
Power Generation ◽  
Control Strategy ◽  
Industry 4.0 ◽  
Power Grid ◽  
Smart Power ◽  
Photovoltaic Power ◽  
Commutation Failure ◽  
Power Generation System ◽  
Photovoltaic Plant ◽  
Transient Overvoltage

The development of smart power systems in Industry 4.0 will bring people better quality electrical energy. The photovoltaic power generation system in the smart grid for Industry 4.0 is also the focus of development. The rapid development of photovoltaic power generation systems will bring people cleaner and greener energy. However, it will cause the transient overvoltage phenomenon near the DC sending terminal when the large-scale photovoltaic plant is connected to the power grid, further bringing about a profound impact on the power grid and its security and stability. In this paper, it is proposed that the rise of transient overvoltage at the photovoltaic terminal is caused by three main factors including the reactive power surplus of DC commutation failure, the weak power grid at the sending terminal, and the control characteristics of the photovoltaic plant. Then, the coordinated control strategy of transient overvoltage is proposed, and the overvoltage control strategy of the DC transmission terminal and the photovoltaic power plant control strategy are, respectively, optimized. Finally, the influence parameters of overvoltage are analysed and the corresponding photovoltaic strategy is presented. The optimization results of photovoltaic parameters and the proposed strategies of photovoltaic power generation can effectively restrain the voltage or frequency fluctuation and power oscillation caused by HVDC commutation failure. This study promotes the development of the photovoltaic power generation system in the intelligent power system of industry 4.0.

scholarly journals Frequency regulation strategy of photovoltaic system based on system identification

2021 ◽  
Vol 252 ◽  
pp. 02082
Author(s):  
Li Zhenjie ◽  
Hou Guangsong ◽  
Cheng Zhaolong ◽  
Niu Wenhui ◽  
Hu Guohua
Keyword(s):  
Power Generation ◽  
System Identification ◽  
Large Scale ◽  
Control Method ◽  
Power Grid ◽  
Frequency Deviation ◽  
Photovoltaic System ◽  
Frequency Regulation ◽  
Photovoltaic Power ◽  
System Frequency

The large-scale grid connection of photovoltaic power generation results in the power system frequency fluctuation and frequency regulation capacity decline, which endangers the dynamic security of power grid frequency. In order to reduce the frequency deviation of power grid and tap the potential of photovoltaic power generation participating in frequency regulation, a control method of photovoltaic power participating in frequency regulation of power grid is proposed in this paper. The maximum allowable power of photovoltaic power is predicted through system identification, and the load shedding rate is determined based on this, and the output power is corrected according to the system frequency deviation to participate in frequency regulation of power grid. The model based on MATLAB Simulation results shows the effectiveness of the proposed method.

scholarly journals Frequency Modulation Method and System of Photovoltaic Virtual Synchronous Generator Based on Computer Technology

2021 ◽  
Vol 2143 (1) ◽  
pp. 012028
Author(s):  
Jiangfeng Zhang ◽  
Ye Su ◽  
Keke Zheng ◽  
Liyun Hua
Keyword(s):  
Power Generation ◽  
Power Grid ◽  
Synchronous Generator ◽  
Clean Energy ◽  
Voltage Regulation ◽  
Frequency Regulation ◽  
Important Research ◽  
Photovoltaic Power ◽  
Primary Frequency ◽  
Virtual Synchronous Generator

Abstract With people’s attention to environmental protection, clean energy has become an important research and development direction. Among them, photovoltaic power generation has many advantages, such as simple process, no fuel consumption, no noise, no pollution and so on. The power grid capacity is becoming larger and larger, and has a great impact on the environment. Therefore, the grid connection of photovoltaic power generation will cause major problems for the planning, operation and dispatching of power grid. Virtual synchronous generator (hereinafter referred to as VSG) technology can simulate the inertia, primary frequency regulation and voltage regulation characteristics of synchronous generator, which has become an important way to improve the dynamic frequency response ability of the system. Therefore, VSG technology has become an important research technology of photovoltaic grid connected system, among which FM method will also become an important research direction. Firstly, this paper analyzes the VSG algorithm and its basic characteristics. Finally, this paper analyzes the control scheme of overall primary frequency regulation of photovoltaic power station (hereinafter referred to as PPS).

scholarly journals Research and Economic Analysis of the Source-Load Coordination of Oil Shale Exploitation

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Xiyun Yang ◽  
Le Zhang ◽  
Tianze Ye ◽  
Yuwei Yang ◽  
Yiwei Wang ◽  
...  
Keyword(s):  
Economic Analysis ◽  
Wind Power ◽  
Power Supply ◽  
Power Output ◽  
Oil Shale ◽  
Heating Temperature ◽  
Power Grid ◽  
Electric Heating ◽  
Photovoltaic Power

In-situ exploitation of oil shale by electric heating consumes large amounts of electricity. Under the existing dispatch system, using wind power output and photovoltaic power output to support the exploitation of oil shale can promote renewable energy use, reduce the consumption of coal and other fossil fuels, and protect the environment from pollution. In this study, the characteristics of the wind power and photovoltaic power output are analyzed, and the correlation between the power outputs is evaluated using the copula function. The load of exploiting oil shale is presented. In order to match the heating load characteristics of oil shale exploitation, a particle swarm optimization algorithm is used to optimize the heating temperature of the heated well to minimize the cost. An economic analysis is conducted of five different power supply combinations, including wind power, photovoltaic power, and the existing power grid. The income ratio of the five modes is calculated using actual data of a project in Jilin province in China, and the feasibility of in-situ electric heating by wind power, photovoltaic power, and the power grid is determined. The results of this study provide useful references for decision makers to plan the power supply scheme for in-situ oil shale exploitation.

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