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谐波的基本定义
1.2.1领域内关键词语的基本概念
1.2.1 Basic concepts of key words in the field
谐波：（harmonic） 对周期性交流信号量进行傅立叶级数分解，得到频率为基波频率大于1的整数倍的分量。我国供电系统1次谐波的频率为50Hz，所以5次谐波的频率为250 Hz。7次谐波的频率为350 Hz。11次谐波的频率为550 Hz，13次谐波的频率为650 Hz。
Harmonics: (harmonic) Fourier series decomposition of periodic AC signal is carried out, and the component whose frequency is an integer multiple of the fundamental frequency is obtained. The frequency of the first harmonic of the power supply system in our country is 50Hz, so the frequency of the fifth harmonic is 250 Hz. The frequency of the 7th harmonic is 350 Hz. The frequency of the 11th harmonic is 550 Hz, and the frequency of the 13th harmonic is 650 Hz.
公共连接点：（PCC）用户接入电网的连接处。
Common Connection Points: (PCC) Connections where users access the power grid.
总谐波畸变率：（THD）周期性交流量的谐波含量的方均根值与基波分量的方均根值之比（用百分数表示）。电压总谐波畸变率以THDU表示，电流总谐波畸变率以THDI表示。
Total Harmonic Distortion Rate: (THD) Ratio of the RMS of the harmonic content of periodic AC to the RMS of the fundamental component (expressed in percentage). The total harmonic distortion rate of voltage is expressed in THDU and that of current is expressed in THDI.
谐波源（harmonic source）：向公用电网注入谐波电流或在公用电网中产生谐波电压的电气设备。
Harmonic source: Electrical equipment that injects harmonic current into the public power grid or generates harmonic voltage in the public power grid.
感性无功：电动机，变压器在能量转换过程中建立交变磁场，在一个周期内吸收的功率和释放的功率相等，这种功率叫感性无功功率。
Inductive reactive power: In the process of energy conversion, motor and transformer establish alternating magnetic field, which absorbs the same power and releases the same power in a cycle. This power is called inductive reactive power.
容性无功电容器在交流电网中接通时在一个周期内，上半周期的充电功率和下半周期的放电功率相等，不消耗能量，这种充放电功率叫容性无功功率。
When capacitive reactive power capacitor is connected in AC network, the charging power in the first mojuhdz.37ix.com.cnmojulys.37ix.com.cnresuomo.37ix.com.cnperesuomo.37ix.com.cnpvcmo.37ix.com.cn kongzhiqi.37ix.com.cnhalf cycle is equal to the discharging power in the second half cycle, which does not consume energy. This kind of charging and discharging power is called capacitive reactive power.
功率因数：有功功率与视在功率的比值称为功率数。
Power factor: The ratio of active power to apparent power is called power factor.
功率因数调整电费：实行两部分电价制度的用电企业，供电部门根据用户平均功率因数而加收或减免的电费，称为功率因数调整电费
Power Factor Adjustment of Electricity Fees: Electricity enterprises that implement two-part tariff system. Power supply departments add or subtract electricity fees according to the average power factor of users, which is called power factor adjustment of electricity fees.
1.2.1 Basic concepts of key words in the field
谐波：（harmonic） 对周期性交流信号量进行傅立叶级数分解，得到频率为基波频率大于1的整数倍的分量。我国供电系统1次谐波的频率为50Hz，所以5次谐波的频率为250 Hz。7次谐波的频率为350 Hz。11次谐波的频率为550 Hz，13次谐波的频率为650 Hz。
Harmonics: (harmonic) Fourier series decomposition of periodic AC signal is carried out, and the component whose frequency is an integer multiple of the fundamental frequency is obtained. The frequency of the first harmonic of the power supply system in our country is 50Hz, so the frequency of the fifth harmonic is 250 Hz. The frequency of the 7th harmonic is 350 Hz. The frequency of the 11th harmonic is 550 Hz, and the frequency of the 13th harmonic is 650 Hz.
公共连接点：（PCC）用户接入电网的连接处。
Common Connection Points: (PCC) Connections where users access the power grid.
总谐波畸变率：（THD）周期性交流量的谐波含量的方均根值与基波分量的方均根值之比（用百分数表示）。电压总谐波畸变率以THDU表示，电流总谐波畸变率以THDI表示。
Total Harmonic Distortion Rate: (THD) Ratio of the RMS of the harmonic content of periodic AC to the RMS of the fundamental component (expressed in percentage). The total harmonic distortion rate of voltage is expressed in THDU and that of current is expressed in THDI.
谐波源（harmonic source）：向公用电网注入谐波电流或在公用电网中产生谐波电压的电气设备。
Harmonic source: Electrical equipment that injects harmonic current into the public power grid or generates harmonic voltage in the public power grid.
感性无功：电动机，变压器在能量转换过程中建立交变磁场，在一个周期内吸收的功率和释放的功率相等，这种功率叫感性无功功率。
Inductive reactive power: In the process of energy conversion, motor and transformer establish alternating magnetic field, which absorbs the same power and releases the same power in a cycle. This power is called inductive reactive power.
容性无功电容器在交流电网中接通时在一个周期内，上半周期的充电功率和下半周期的放电功率相等，不消耗能量，这种充放电功率叫容性无功功率。
When capacitive reactive power capacitor is connected in AC network, the charging power in the first mojuhdz.37ix.com.cnmojulys.37ix.com.cnresuomo.37ix.com.cnperesuomo.37ix.com.cnpvcmo.37ix.com.cn kongzhiqi.37ix.com.cnhalf cycle is equal to the discharging power in the second half cycle, which does not consume energy. This kind of charging and discharging power is called capacitive reactive power.
功率因数：有功功率与视在功率的比值称为功率数。
Power factor: The ratio of active power to apparent power is called power factor.
功率因数调整电费：实行两部分电价制度的用电企业，供电部门根据用户平均功率因数而加收或减免的电费，称为功率因数调整电费
Power Factor Adjustment of Electricity Fees: Electricity enterprises that implement two-part tariff system. Power supply departments add or subtract electricity fees according to the average power factor of users, which is called power factor adjustment of electricity fees.
