基于NCD优化的光-火微网频率控制方法研究

为了提高光-火微电网运行时系统的频率稳定性,提出了基于优化控制工具箱和优化函数相结合的NCD（非线性控制设计）改进PID控制器,并加入到光-火微网中调节电网频率。分别建立光伏系统和火力发电机组的数学模型,将光伏和负荷引起的系统有功变化量作用于火力发电机组,通过设计NCD优化控制策略,以减少因光伏系统功率输出的不稳定性造成电网频率出现的偏差。通过在Simulink中搭建光-火微网模型,仿真结果及数据分析验证了该方案的可行性。与传统的频率调节相比,该方法实现系统更快的响应性、更小的超调量和更强的鲁棒性,减少了光伏并网对电力系统有功平衡造成的扰动。...

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Published in电力系统保护与控制 Vol. 45; no. 13; pp. 14 - 20
Main Author 莫槟滔 陈峦 井实 鲁尔洁 郑彬 姚亮
Format Journal Article
LanguageChinese
Published 电子科技大学 能源科学与工程学院,四川 成都,611731%国网四川省电力公司天府新区供电公司,四川 成都,610041 2017
Subjects
NCD优化
PID控制
仿真模型
光伏并网
电网频率
optimization on NCD
光伏并网
photovoltaic grid-connected
simulation model
NCD优化
电网频率
grid frequency
PID control
PID控制
仿真模型
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ISSN1674-3415
DOI10.7667/PSPC161007

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Summary:为了提高光-火微电网运行时系统的频率稳定性,提出了基于优化控制工具箱和优化函数相结合的NCD（非线性控制设计）改进PID控制器,并加入到光-火微网中调节电网频率。分别建立光伏系统和火力发电机组的数学模型,将光伏和负荷引起的系统有功变化量作用于火力发电机组,通过设计NCD优化控制策略,以减少因光伏系统功率输出的不稳定性造成电网频率出现的偏差。通过在Simulink中搭建光-火微网模型,仿真结果及数据分析验证了该方案的可行性。与传统的频率调节相比,该方法实现系统更快的响应性、更小的超调量和更强的鲁棒性,减少了光伏并网对电力系统有功平衡造成的扰动。
Bibliography:In order to improve the frequency stability of solar-thermal microgrid, this paper puts forward a method by combination of optimization toolbox control and optimization function based on Nonlinear Control Design （NCD） to improve PID control, and applies it to the power system frequency regulation. Mathematical models of photovoltaic systems and thermal power are respectively established, and the total amount of change in the active role of photovoltaic systems and load is applied to the thermal power generating units for reducing the deviation of the power system frequency caused by the instability of PV system, by means of the NCD controller. Based on the solar-thermal microgrid model on Simulink, the simulation and data analysis have verified the effectiveness of the proposed scheme. Compared with the conventional frequency regulation, the proposed scheme achieves faster system response, smaller overshoot and stronger robustness, and reduces the disturbance of the power system active balance caused by the p
ISSN:1674-3415
DOI:10.7667/PSPC161007