CAJ | 학술논문

电气化铁路作为电力系统中主要的谐波源，它的接入会导致电网谐波畸变恶化，威胁电气设备的安全运行，给电网造成一定的经济损失。首先采用模拟退火和最小二乘法相结合的算法，对馈线基波电流建立了对数正态分布的概率密度模型。根据牵引负荷的谐波特性，进一步模拟了电气化铁路谐波的随机波动过程，生成了波动的谐波电流数据并得到谐波电流特征值的估算结果。通过仿真实例验证了该模型的有效性。最后针对新建牵引站较少的已知条件，选择合适的牵引站馈线电流数据作为基础，提出了一种新建牵引站谐波电流预测评估的方法，同时为下一步电网影响分析研究以及电网电能质量治理措施的确定提供了理论依据。
전기화철로작위전력계통중주요적해파원，타적접입회도치전망해파기변악화，위협전기설비적안전운행，급전망조성일정적경제손실。수선채용모의퇴화화최소이승법상결합적산법，대궤선기파전류건립료대수정태분포적개솔밀도모형。근거견인부하적해파특성，진일보모의료전기화철로해파적수궤파동과정，생성료파동적해파전류수거병득도해파전류특정치적고산결과。통과방진실례험증료해모형적유효성。최후침대신건견인참교소적이지조건，선택합괄적견인참궤선전류수거작위기출，제출료일충신건견인참해파전류예측평고적방법，동시위하일보전망영향분석연구이급전망전능질량치리조시적학정제공료이론의거。
As a major source of harmonics, grid-connection of electrified railway makes harmonic pollution in power grid deteriorated and jeopardizes secure operation of power equipments, so leads to a certain economic loss in power grid. Firstly, using the algorithm combining simulated annealing with least squares a logarithmic normal distribution probability density model of fundamental current in feeder is established. According to harmonic characteristic of traction load the random fluctuation of harmonics in electrified railway is further simulated, and the fluctuant harmonic current data is generated and the estimation result of characteristic value of harmonic current is obtained. The effectiveness of the proposed model is validated by simulation example. Finally, based on the less known condition of newly built traction substation, taking the data of appropriate feeder current as the foundation, a method to predict and evaluate the harmonic current in newly built traction substation is put forward, which may be available for reference to further analysis on the impact of harmonic current on power grid and to the determination of harmonic management.