MGP与储能联合参与新能源电网调频的研究

Research on MGP and Energy Storage Jointly Participating in Frequency Modulation of New Energy Grid

随着新能源电网中光伏等间歇性能源的提升,高比例新能源电网低惯量、稳定性差的缺点愈发明显。依据同步电动机-同步发电机对(synchronous motor-generator pair, MGP)可提供较大转动惯量、有利电网稳定的特性;同时考虑间歇性能源最大功率输出时不具备调频能力的特点,提出将储能系统引入到光伏经MGP并网系统中,使光伏参与电网调频的能力可以达到传统火电机组的效果。搭建了含火电机组、光伏发电、储能、MGP及负荷等元件的仿真模型,通过对仿真模型施加扰动来研究MGP与储能联合参与新能源电网的调频能力。结果表明,该方法可以有效地增强系统的频率支撑能力,有利于电网的稳定运行。

With the improvement of intermittent energy such as photovoltaic in new energy grid, the disadvantages of low inertia and poor stability of the high proportion of new energy grid become more and more obvious. According to the characteristics that the synchronous motor-generator pair(MGP) can provide a large moment of inertia and is beneficial to the stability of the power grid, also by considering that the intermittent energy is unable to modulate frequency at the maximum power output, this paper proposes to introduce the energy storage system into the photovoltaic grid connected system via MGP, so that the ability of photovoltaic to participate in grid frequency modulation can reach the level of traditional thermal power units. A simulation model including thermal power unit, photovoltaic power generation, energy storage, MGP and load is built. By applying disturbance to the simulation model, the frequency modulation capability of MGP and energy storage participating in the new energy grid is studied. The results show that this method can effectively enhance the frequency support ability of the system and is conducive to the stable operation of the power grid.