基于主变压器有载逆调压的降损节能分析
发布时间：2018-09-05 15:22
【摘要】：当前,电网结构随着电力系统的发展而日趋复杂,配电网供电质量直接影响电力网络安全稳定经济运行,因此如何向电力用户提供高质量电能并合理提高电网经济效益已是摆在电力系统面前的一个重要问题。大部分地区电网针对因负荷变化引起的电压偏移问题,采用无功补偿就地平衡的原则进行电网无功优化,但由于配电网负荷波动性较大,此种方式无法实现全网整体协调且在有载调压时容易导致电网震荡,从而造成高峰负荷时电网末端电压很低,夜间和低谷负荷时系统电压偏高,电网铁损急剧上升。因此,一个以调压与并联电容器补偿相结合的节能措施已被人们所关注。论文提出在无功补偿就地平衡的前提下,以提高电压质量、节约电网电能、降低电网损耗为目标,对整个配电网络合理采用有载逆调压技术并进行研究,根据负荷变化,以全网损耗最小为原则,对电网中主变压器采用有载逆调压技术合理选择调压级别,改进了以往文献单独强调变压器经济运行的局限性。配电网实际运行过程中,由于配电线路和配电变压器负荷系数不一致,造成利用等值电阻法计算线损误差过大。针对此问题,论文对等值电阻法进行改进,以配电变压器运行参数及额定容量、配电线路参数、配电变压器及配电线路中的电量为基础,计算线损,提高了计算精度,为配电网降损节能实例分析奠定了基础。论文以沈阳东民变电站实际运行参数为例,通过对数据进行比较进而分析东民变电站的经济电压级别,结果表明:负载率升高带动各线路有功损耗及总损耗升高,与功率损耗最小相对应的经济电压也随之增加;在调压过程中,应重点考虑变电站各支路变压器的数量和输电线路的长度这两个因素;合理使用有载逆调压技术,采用经济运行方式,可保证电压稳定性,提高配电网整体经济效益。因此,主变压器有载逆调压技术的使用,显著提高了电压合格率,降低了电网的有功功率损耗,达到了全网协调节能降损的目的。为电网的安全稳定的运行提供了保证,也给国民生活带来了不可小视的社会意义及经济效益。
[Abstract]:At present, the power network structure is becoming more and more complex with the development of the power system. The power supply quality of the distribution network directly affects the security, stability and economic operation of the power network. Therefore, how to provide high quality electric energy to power users and how to improve the economic benefits of power system is an important problem in front of the power system. In order to solve the problem of voltage offset caused by load variation, reactive power optimization is carried out by using the principle of local balance of reactive power compensation, but the load fluctuation of distribution network is large. This method can not realize the overall coordination of the whole network and can easily lead to power grid oscillation when there is load voltage regulation, which results in low terminal voltage at peak load, high system voltage at night and low load, and a sharp rise in iron loss. Therefore, an energy-saving measure combining voltage regulation and shunt capacitor compensation has been paid attention to. Under the premise of local balance of reactive power compensation, aiming at improving voltage quality, saving electric energy and reducing power loss, this paper adopts the technology of load inverse voltage regulation in the whole distribution network reasonably and studies it according to the load variation. Based on the principle of minimum loss of the whole network, the load inverse voltage regulation technology is used to select the voltage regulation grade reasonably for the main transformer in the power network, which improves the limitation of the previous literature that only emphasizes the economic operation of the transformer. In the actual operation of distribution network, because the load coefficient of distribution line and transformer is not consistent, the error of calculating line loss by using equivalent resistance method is too large. In order to solve this problem, the paper improves the equivalent resistance method, based on the operation parameters and rated capacity of distribution transformer, the parameters of distribution line, and the quantity of electricity in distribution transformer and distribution line, the line loss is calculated and the calculation precision is improved. It lays a foundation for example analysis of reducing loss and saving energy in distribution network. Taking the actual operation parameters of Dongmin substation in Shenyang as an example, the economic voltage level of Dongmin substation is analyzed by comparing the data. The results show that the increase of load ratio leads to the increase of active power loss and total loss of each line. The economic voltage corresponding to the minimum power loss also increases. In the process of voltage regulation, two factors, the number of transformer branches in substation and the length of transmission line, should be taken into account. The application of economic operation mode can guarantee voltage stability and improve the overall economic benefit of distribution network. Therefore, the application of on-load inverse voltage regulation technology of main transformer can significantly improve the qualified rate of voltage, reduce the active power loss of the power network, and achieve the goal of coordinated energy saving and loss reduction of the whole network. It not only guarantees the safe and stable operation of the power grid, but also brings the social significance and economic benefit to the national life.
【学位授予单位】：沈阳农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM714.3
，
本文编号：2224674
[Abstract]:At present, the power network structure is becoming more and more complex with the development of the power system. The power supply quality of the distribution network directly affects the security, stability and economic operation of the power network. Therefore, how to provide high quality electric energy to power users and how to improve the economic benefits of power system is an important problem in front of the power system. In order to solve the problem of voltage offset caused by load variation, reactive power optimization is carried out by using the principle of local balance of reactive power compensation, but the load fluctuation of distribution network is large. This method can not realize the overall coordination of the whole network and can easily lead to power grid oscillation when there is load voltage regulation, which results in low terminal voltage at peak load, high system voltage at night and low load, and a sharp rise in iron loss. Therefore, an energy-saving measure combining voltage regulation and shunt capacitor compensation has been paid attention to. Under the premise of local balance of reactive power compensation, aiming at improving voltage quality, saving electric energy and reducing power loss, this paper adopts the technology of load inverse voltage regulation in the whole distribution network reasonably and studies it according to the load variation. Based on the principle of minimum loss of the whole network, the load inverse voltage regulation technology is used to select the voltage regulation grade reasonably for the main transformer in the power network, which improves the limitation of the previous literature that only emphasizes the economic operation of the transformer. In the actual operation of distribution network, because the load coefficient of distribution line and transformer is not consistent, the error of calculating line loss by using equivalent resistance method is too large. In order to solve this problem, the paper improves the equivalent resistance method, based on the operation parameters and rated capacity of distribution transformer, the parameters of distribution line, and the quantity of electricity in distribution transformer and distribution line, the line loss is calculated and the calculation precision is improved. It lays a foundation for example analysis of reducing loss and saving energy in distribution network. Taking the actual operation parameters of Dongmin substation in Shenyang as an example, the economic voltage level of Dongmin substation is analyzed by comparing the data. The results show that the increase of load ratio leads to the increase of active power loss and total loss of each line. The economic voltage corresponding to the minimum power loss also increases. In the process of voltage regulation, two factors, the number of transformer branches in substation and the length of transmission line, should be taken into account. The application of economic operation mode can guarantee voltage stability and improve the overall economic benefit of distribution network. Therefore, the application of on-load inverse voltage regulation technology of main transformer can significantly improve the qualified rate of voltage, reduce the active power loss of the power network, and achieve the goal of coordinated energy saving and loss reduction of the whole network. It not only guarantees the safe and stable operation of the power grid, but also brings the social significance and economic benefit to the national life.
【学位授予单位】：沈阳农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM714.3
，
本文编号：2224674
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