一种太阳电池阵在轨输出电流预计方法

Method of one predicting solar array output current in orbit

太阳电池阵作为长寿命小卫星的主能源,负责光电能量转换,其在轨输出电流受诸多外部因素和内部因素的影响,其中最重要的是有效太阳光强的影响和空间环境导致自身性能衰降的影响。因此太阳电池阵在轨输出电流呈现长期缓慢衰降的趋势,尤其在寿命中后期及超期服役阶段,输出电流可能还会受到一些如轨道漂移等不可预计因素的影响而发生变化。掌握太阳电池阵在轨输出电流的变化规律,对于是否需要采取能源参数的调整、改变载荷的使用策略或变轨等确保整星能源安全的在轨管理措施具有重要意义。以在轨卫星的实测数据为基础,对已知的外部影响因素进行归一化处理,分析其规律性,采用数学函数的方式对归一化后的在轨数据进行拟合,得到太阳阵在轨输出电流的预计模型,并将采用此模型的预计值与实测值进行比较,验证了模型精度。

Solar array was the main power of long lifetime satellite,which was responsible for converting light energy into electrical energy.Solar array output current in orbit was affected by many inside or outside factors,the most important factors were effective solar intensity and performance degradation due to space environment.Solar array output current appeared slow degradation tendency,especially at end of lifetime or during the period of exceeding lifetime,solar array output current might be affected by some unpredictable factors such as orbit excursion.Finding out that the variation regulation of solar array output current was necessary to applying some in orbit management measures including changing power parameter,regulating payload operation mode,or changing orbit to ensure satellite power safety.On the basis of satellite in orbit telemetry data,normalization of known outside affection factors were deal with the method of regularity,the normalized orbit data was matched by the math function.Then the solar array output current predicting model was obtained.Compare the predicting data according to this model with the actual data in orbit,the accuracy of the model was testified.