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Photovoltaic System Power Reserve Determination Using Parabolic Approximation of Frequency Response
IEEE Transactions on Smart Grid ( IF 9.6 ) Pub Date : 2021-02-24 , DOI: 10.1109/tsg.2021.3061893
Tomislav Baskarad , Igor Kuzle , Ninoslav Holjevac

The most commonly used method for including photovoltaic system in the control of system frequency is to operate a PV power plant at reduced power while maintaining a specific amount of available power reserve. Such operating regime, often referred to as de-loaded, can cause additional costs and, consequently, determining a required power reduction becomes vitally important. This paper introduces a method for determining the required minimum de-loaded reserve of a photovoltaic system. To achieve the desired result a parabolic approximation of the system frequency response is developed to derive an explicit function of the frequency nadir. Taking this approximation into consideration, a method for determining the required minimum de-loaded margin was developed and tested in a case-study which observed a small power system consisting of several power plants. To demonstrate the accuracy of the proposed parabolic approximation, the calculated approximate values of the frequency nadir were compared to the values of the frequency nadir obtained from the frequency response simulations performed on the power system model developed in MATLAB/Simulink.

中文翻译:

使用频率响应的抛物线近似确定光伏系统功率储备

将光伏系统包括在系统频率控制中的最常用方法是以降低的功率运行光伏电站,同时保持特定数量的可用功率储备。这种通常被称为减载的运行机制会导致额外的成本,因此,确定所需的功率降低变得至关重要。本文介绍了一种确定光伏系统所需最小卸载储备的方法。为了获得所需的结果,开发了系统频率响应的抛物线近似,以导出频率最低点的显式函数。考虑到这个近似,在一个案例研究中开发并测试了一种确定所需最小卸载裕度的方法,该案例研究观察了一个由多个发电厂组成的小型电力系统。为了证明所提出的抛物线近似的准确性,将计算出的频率最低点的近似值与从在 MATLAB/Simulink 中开发的电力系统模型上执行的频率响应仿真中获得的频率最低点的值进行比较。
更新日期:2021-02-24
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