变电站内SVG室热湿环境数值模拟

Numerical Simulation of Thermal and Humid Environment of SVG Chamber in Substation

随着城市的快速发展,地下变电站应运而生,随之而来的问题就是地下装置温度的要求是否达标。变电站内大功率电力电子设备在运行过程中,除了要消耗大量有功功率外,还需要吸收大量的冲击性无功功率,这样就会引起配电网系统发生低功率因数、电压波动与闪变、谐波、以及三相不平衡等问题,不仅使配电网供电电能质量逐步恶化,同时谐波还会引起配电网保护控制系统发生“拒动”、“误动”等不利情况发生,降低配电网供电可靠性。因此,在存在大量谐波分量的配电网系统中,进行无功补偿和谐波治理是非常必要的,SVG无功补偿装置应运而生[1]。但SVG工作时会因为功率损耗引起器件发热、升温,SVG装置长期运行期间,应注意保持室内温度,当室内温度高于37℃应尽快做降温处理。通过对SVG壁面温度、墙壁温度的温度测量以及进风风口风速的测量,对SVG室室内热湿环境进行了数值模拟分析,并判断室内温度是否达到要求[2]。

With the rapid development of the city,the underground substation arises at the historic moment.The following problem is whether the temperature requirement of the underground device meets the standard.Substation in high-power power electronic equipment in the process of operation,in addition to consume a large amount of active power,still need to absorb a large number of impact of reactive power,it will cause low power factor of power system,voltage fluctuation and flicker,harmonic,and problems such as unbalanced three-phase not only make the distribution network gradually worsening of power supply quality,At the same time,harmonics can also cause adverse situations such as"rejection"and"misoperation"of the protection and control system of the distribution network,and reduce the power supply reliability of the distribution network.Therefore,in the distribution network system with a large number of harmonic components,it is very necessary to carry out reactive power compensation and harmonic control,SVG reactive power compensation device arises at the right moment.However,power loss will cause device heating and temperature rise when SVG is working.During the long-term operation of SVG device,attention should be paid to maintaining the indoor temperature.When the indoor temperature is higher than 37℃,cooling treatment should be done as soon as possible.In this paper,by measuring the SVG wall temperature,wall temperature and air inlet wind speed,the indoor hot and wet environment of the SVG chamber was numericly simulated and analyzed,and the indoor temperature was determined to meet the requirements.