6与12脉冲整流器原理

6与12脉冲整流器原理 一、理论推导 1、6脉冲整流器原理: 6脉冲指以6个可控硅(晶闸管)组成的全桥整流，由于有6个开关脉冲对6个可控硅分别控制，所以叫6脉冲整流。 当忽略三相桥式可控硅整流电路换相过程和电流脉动，假定交流侧电抗为零，直流电感为无穷大，延迟触发角a为零，则交流侧电流傅里叶级数展开为: (1-1) 由公式(1-1)可得以下结论: 电流中含6K?1(k为正整数)次谐波，即5、7、11、13...等各次谐波，各次谐波的有效值与谐波次数成反比，且与基波有效值的比值为谐波次数的倒数。 intensive development. (5) have different emphasis: for development, "with development, the emphasis on" way, from space, multiple groups from a single radiation-belt open development. Spatial structure of 2, the prominent cultural city protection elements on the development of the whole city and culture series supporting role, with natural landscapes and green for the background, according to the combined city, urban Group organization structure, set up a decentralized development patterns, building ... Three rivers: the Yangtze, jinsha River and minjiang rivers, cities in three rivers based on development along the Yangtze River, city on the River, River in the city. Multiple groups: the relatively compact area layout, each district consists of multiple groups, and the area has both integrated urban functions, and have their own characteristics and perimeter formation Li Zhuang, Li Zhuangdong characteristic tour area and Hong Kong in group, consists of 17 groups. Band: modern features gathering along the Yangtze River belt. Dvn group in the upper reaches of the jinsha River along the river continues to the East to South stream groups, layout along the city's main commercial, business, administrative, cultural and creative research and development in science and education function of modern service and port equipment manufacturing, liquor, and other features and modern industry. 2.5-2 spatial planning figure 2.6 in Yibin city, Central City urban development vision vision 图1.1 计算机仿真的6脉冲A相的输入电压、电流波形 2、12脉冲整流器原理: 12脉冲是指在原有6脉冲整流的基础上，在输入端、增加移相变压器后在 增加一组6脉冲整流器，使直流母线电流由12个可控硅整流完成，因此又称为12脉冲整流。 下图所示I和II两个三相整流电路就是通过变压器的不同联结构成12相整流电路。 12脉冲整流器示意图(由2个6脉冲并联组成) 桥1的网侧电流傅立叶级数展开为: intensive development. (5) have different emphasis: for development, "with development, the emphasis on" way, from space, multiple groups from a single radiation-belt open development. Spatial structure of 2, the prominent cultural city protection elements on the development of the whole city and culture series supporting role, with natural landscapes and green for the background, according to the combined city, urban Group organization structure, set up a decentralized development patterns, building ... Three rivers: the Yangtze, jinsha River and minjiang rivers, cities in three rivers based on development along the Yangtze River, city on the River, River in the city. Multiple groups: the relatively compact area layout, each district consists of multiple groups, and the area has both integrated urban functions, and have their own characteristics and perimeter formation Li Zhuang, Li Zhuangdong characteristic tour area and Hong Kong in group, consists of 17 groups. Band: modern features gathering along the Yangtze River belt. Dvn group in the upper reaches of the jinsha River along the river continues to the East to South stream groups, layout along the city's main commercial, business, administrative, cultural and creative research and development in science and education function of modern service and port equipment manufacturing, liquor, and other features and modern industry. 2.5-2 spatial planning figure 2.6 in Yibin city, Central City urban development vision vision (1-2) 桥II网侧线电压比桥I超前30?，因网侧线电流比桥I超前30? (1-3) 故合成的网侧线电流 (1-4) 可见，两个整流桥产生的5、7、17、19、...次谐波相互抵消，注入电网的 、13、23、25等各次谐波，且其有效值只有12k?1(k为正整数)次谐波，即11 与与谐波次数成反比，而与基波有效值的比值为谐波次数的倒数。 图1.2 计算机仿真的12脉冲UPS A相的输入电压、电流波形 intensive development. (5) have different emphasis: for development, "with development, the emphasis on" way, from space, multiple groups from a single radiation-belt open development. Spatial structure of 2, the prominent cultural city protection elements on the development of the whole city and culture series supporting role, with natural landscapes and green for the background, according to the combined city, urban Group organization structure, set up a decentralized development patterns, building ... Three rivers: the Yangtze, jinsha River and minjiang rivers, cities in three rivers based on development along the Yangtze River, city on the River, River in the city. Multiple groups: the relatively compact area layout, each district consists of multiple groups, and the area has both integrated urban functions, and have their own characteristics and perimeter formation Li Zhuang, Li Zhuangdong characteristic tour area and Hong Kong in group, consists of 17 groups. Band: modern features gathering along the Yangtze River belt. Dvn group in the upper reaches of the jinsha River along the river continues to the East to South stream groups, layout along the city's main commercial, business, administrative, cultural and creative research and development in science and education function of modern service and port equipment manufacturing, liquor, and other features and modern industry. 2.5-2 spatial planning figure 2.6 in Yibin city, Central City urban development vision vision 二、实测数据分析。 以上计算为理想状态，忽略了很多因数，如换相过程、直流侧电流脉动、触发延迟角，交流侧电抗等。因此实测值与计算值有一定出入。 理论计算谐波表: 某型号大功率UPS谐波实测数据表: 从以上两表对比可得，6脉整流器谐波含量最大为5次谐波、12脉整流器强度最大为11次谐波，与理论计算结果一致。6脉5次谐波实测值较计算值偏大，12脉11次谐波实测值与计算值相同。 三、谐波分析和改良对策 谐波可能造成配电线缆、变压器发热，降低通话质量，空气开关误动作，发电机喘振等不良后果;谐波按电流相序分为+序(3k+1次，k为0和正整数)、-序(3k+2次，k为0和正整数)、0序(3k次，k为正整数)。 +序电流使损耗加重，-序电流使电机反转、发热，0序电流使中线电流异常增大。 从实测值可见，6脉整流器5次谐波最大，可加装5次滤波器来抑制谐波;12脉整流器11次谐波最大，可加装11次滤波器来抑制谐波。滤波器原理图如下: intensive development. (5) have different emphasis: for development, "with development, the emphasis on" way, from space, multiple groups from a single radiation-belt open development. Spatial structure of 2, the prominent cultural city protection elements on the development of the whole city and culture series supporting role, with natural landscapes and green for the background, according to the combined city, urban Group organization structure, set up a decentralized development patterns, building ... Three rivers: the Yangtze, jinsha River and minjiang rivers, cities in three rivers based on development along the Yangtze River, city on the River, River in the city. Multiple groups: the relatively compact area layout, each district consists of multiple groups, and the area has both integrated urban functions, and have their own characteristics and perimeter formation Li Zhuang, Li Zhuangdong characteristic tour area and Hong Kong in group, consists of 17 groups. Band: modern features gathering along the Yangtze River belt. Dvn group in the upper reaches of the jinsha River along the river continues to the East to South stream groups, layout along the city's main commercial, business, administrative, cultural and creative research and development in science and education function of modern service and port equipment manufacturing, liquor, and other features and modern industry. 2.5-2 spatial planning figure 2.6 in Yibin city, Central City urban development vision vision 图:常用的LC滤波器原理图 某型号大功率UPS加装滤波器后谐波对比表如下: 从上表可以看出，加装滤波器对谐波抑制作用非常明显。 需要特别指出的是:6脉冲+5次谐波滤波器的配置可以达到9,左右的谐波要求，但是由于5次谐波(250Hz)滤波器的电容容值较大，在UPS负载较轻(<15%额定负载)时，整流器输入电流会超前输入电压，如果发电机的励磁绕组采用自励方式，很容易产生电枢正反馈效应，发电机输出电压会异常升高，导致发电机进入保护状态而停机。因此6脉冲+5次谐波滤波器 方案 气瓶 现场处置方案 .pdf气瓶 现场处置方案 .doc见习基地管理方案.doc关于群访事件的化解方案建筑工地扬尘治理专项方案下载 不建议在UPS负载较轻时使用。当实际负载较轻时，可将5次谐波滤波器从整流器上脱出。 而单独的12脉整流器也可达到10,左右的电流谐波指标，但是没有大电容 的LC电路，避免了与发电机的励磁正反馈效应。 采用12脉冲整流器+11次谐波器可达到小于4.5%的电流谐波指标。单次谐波和总谐波含量均满足IEC61000-3-4的指标要求。 附表1:在配置不同负载条件下，输入电流谐波总含量数据 附表2:某型号400KVA 12脉冲+11次滤波器 UPS输入电流总谐波含量表 intensive development. (5) have different emphasis: for development, "with development, the emphasis on" way, from space, multiple groups from a single radiation-belt open development. Spatial structure of 2, the prominent cultural city protection elements on the development of the whole city and culture series supporting role, with natural landscapes and green for the background, according to the combined city, urban Group organization structure, set up a decentralized development patterns, building ... Three rivers: the Yangtze, jinsha River and minjiang rivers, cities in three rivers based on development along the Yangtze River, city on the River, River in the city. Multiple groups: the relatively compact area layout, each district consists of multiple groups, and the area has both integrated urban functions, and have their own characteristics and perimeter formation Li Zhuang, Li Zhuangdong characteristic tour area and Hong Kong in group, consists of 17 groups. Band: modern features gathering along the Yangtze River belt. Dvn group in the upper reaches of the jinsha River along the river continues to the East to South stream groups, layout along the city's main commercial, business, administrative, cultural and creative research and development in science and education function of modern service and port equipment manufacturing, liquor, and other features and modern industry. 2.5-2 spatial planning figure 2.6 in Yibin city, Central City urban development vision vision 影响电网的是谐波电流的绝对值，而不是谐波电流的百分比。由上表可以看出，在满载情况下，谐波电流绝对值最大;在半载及轻载情况下，谐波电流绝对值均不超过100%满载谐波电流绝对值。12脉冲+11次谐波滤波器具有最小的效输入电流总谐波，同时还可避免有源滤波器“误补偿”、系统效率低等缺点，因12脉冲+11次谐波滤波器此对电网的污染最低，适用于可靠性要求较高的场合使用。 四、性能对比: 从上表可以看到，12脉冲整流器在多项性能指标上均优于6脉冲整流器。12脉冲整流技术自70年代诞生自今，经过不断改进和完善，现已逐渐成为大功率UPS整流器的优选技术。全球主流的大功率UPS厂商均推出了12脉冲UPS产品 intensive development. (5) have different emphasis: for development, "with development, the emphasis on" way, from space, multiple groups from a single radiation-belt open development. Spatial structure of 2, the prominent cultural city protection elements on the development of the whole city and culture series supporting role, with natural landscapes and green for the background, according to the combined city, urban Group organization structure, set up a decentralized development patterns, building ... Three rivers: the Yangtze, jinsha River and minjiang rivers, cities in three rivers based on development along the Yangtze River, city on the River, River in the city. Multiple groups: the relatively compact area layout, each district consists of multiple groups, and the area has both integrated urban functions, and have their own characteristics and perimeter formation Li Zhuang, Li Zhuangdong characteristic tour area and Hong Kong in group, consists of 17 groups. Band: modern features gathering along the Yangtze River belt. Dvn group in the upper reaches of the jinsha River along the river continues to the East to South stream groups, layout along the city's main commercial, business, administrative, cultural and creative research and development in science and education function of modern service and port equipment manufacturing, liquor, and other features and modern industry. 2.5-2 spatial planning figure 2.6 in Yibin city, Central City urban development vision vision