大型LED景观照明工程的谐波电流及其治理——以中国尊大厦为例

The Control of Harmonic Current in the LED Landscape Lighing Project:Taking China Zun Building as an Example

通过对中国尊大厦LED景观照明工程所使用的LED灯具及项目现场照明系统进行谐波测试,分析了小功率LED灯具应用于大型LED景观照明工程后,照明系统在LED灯具稳定最大亮度状态、LED灯具亮度动态变化状态,以及有源电力滤波器前后的各次谐波电流和总谐波畸变率。研究发现,LED灯具亮度动态变化时照明系统的总谐波畸变率为7.70%~42.2%,明显大于灯具稳定最大亮度时的总谐波畸变率7.47%,暂态总谐波畸变率最小值比稳定最大亮度时略大,最大值约为稳定最大亮度时的5.6倍,原因是存在大量偶次谐波。有源电力滤波器对稳态和动态变化时的谐波都能实现较好的治理效果,对以奇次谐波为主的稳态和暂态谐波可以实现58%~60%的治理率,对包含大量偶次谐波的暂态谐波也能实现36%的治理率。

In this paper,the harmonic test of LED lamps and lighting system used in LED landscape lighting project of China Zun building is finished.After the application of small power LED lamps in large LED landscape lighting project,the harmonic current and total harmonic distortion rate of the lighting system is analyzed in the stable maximum brightness state of LED lamps and the dynamic change state of LED lamps’brightness,as well as before and after the active power filter(APF).It is found that the total harmonic distortion rate of the lighting system is 7.70%-42.2%when the luminance of LED lamps changes dynamically,which is significantly higher than 7.47%when the LED lamps is in the stable maximum brightness state.The minimum value of the transient total harmonic distortion rate is slightly larger than that of the stable maximum brightness,and the maximum value is about 5.6 times of the stable maximum brightness,the important reason of which is containing a lot of even harmonic.Active power filter can achieve good control effect for both steady and dynamic harmonic.It can achieve a treatment rate of 58%-60%for the steady-state and transient harmonics dominated by odd harmonics and 36%for the transient harmonics containing a large number of even harmonics.