LVRT Testing Procedures 低电压穿越测试程序 Requirements on test circuit 对测试电路的要求
Preliminary selection of current limiting reactance X1 初步选择限流电抗X1 Short-circuit power > 3 times the rated WT power 短路容量>3倍的风电机组额定容量
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LVRT Workshop Beijing 06./07. January 2009 Weck: LVRT requirements and testing
LVRT Testing Procedures 低电压穿越测试程序 Requirements on test circuit 对测试电路的要求
Selection of a suitable system connection point (PCC) 选择适当的系统连接点(PCC) Voltage dip during fault: S sc 故障期间电压跌落： Δu =
S sys + S sc
Permitted voltage dip dependent on PCC to power system 允许的电压跌落取决于电力系统的公共连接点
At low-voltage side of the WT transformer (phase to neutral) 在风电机组变压器的低压侧（相对中性点） At medium-voltage side of the WT transformer (phase to earth) 在风电机组变压器的中压侧（相对地） At system side of LVRT test laboratory (phase to earth) 在低电压穿越测试设备的系统侧（相对地）
“LVRT Testing Procedures of single WECs via field tests” “风电机组低电压穿越现场测试程序”
Dr.-Ing. Karl-Heinz Weck
Forschungsgemeinsc haft für Elektrische Anlagen und Stromwirtschaft e.V.
WT Typ 2: Double-fed asynchronous and full converter generators
风电机组类型2：双馈异步和全功率变频器发电机
Test 测试1: Test 测试2: Test 测试3: Test 测试4: UD UD UD UD <= 5%, = 20%-25%, = 45%-55%, = 70%-80%, Duration 持续时间 >= 150 ms Duration 持续时间 >= 550 ms Duration 持续时间 >= 950 ms Duration 持续时间 >= 1400 ms
Data recording 数据记录
Data recording systems with at least 36 channels and 3 auxilliary channels should be available 数据记录系统至少应有36个通道及3个辅助通道
Sampling rate 5 kHz (IEC 61400-21) or more 采样率为5 kHz (IEC 61400-21) 或更高 Resolution 12 bit or more 分辨率为12 bit或更高 Sampling time 15 s or more 采样时间为15 s或更长
However, power requirements for X2 are smaller, because dip duration is limited to few s 不过，由于电压跌落持续时间限制到几秒，因此对X2的功率要求更小 4
LVRT Workshop Beijing 06./07. January 2009 Weck: LVRT requirements and testing
Measurement uncertainty of 1% should be aimed for for both voltage and current measurements 电压及电流测量的测量不确定度应小于1% Uncertainty budget has to reported in test reports 测试报告应有不确定度情况的相关内容 Current transformer have to be adjusted to the current range required 电流互感器必须要调整至要求的电流范围
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LVRT Workshop Beijing 06./07. January 2009 Weck: LVRT requirements and testing
LVRT Testing Procedures 低电压穿越测试程序 Requirements on measurements 对测量的要求
Measurement uncertainty 测量不确定度
Preferably between 5 times and 10 times the rated WT power 为风电机组额定容量的5至10倍比较适宜 For example例如: SWT = 2 MVA Ssc > 6 MVA Prefably适宜: Ssc = 10 MVA to(至)20 MVA
LVRT Testing Procedures 低电压穿越测试程序 Requirements on measurements 对测量的要求
WT Xsys Usys X1 X2 Voltage transformer 电压互感器 Current transformer 电流互感器
Three-phase voltage measurements by voltage transformers required 使用电压互感器测量三相电压
WT Xsys Usys X1
S sc = X1 ≤
U sys U sys
2
2
X sys + X 1
≥ 3⋅ Sr
3⋅ Sr Resulting current limiting reactance X1 dependent on
因此限流电抗X1取决于
Square of system voltage Usys 系统电压的平方 Rated power of WT Short-circuit power at PCC 2 风电机组额定容量 公共连接点的短路容量

Durations according to Transmission Code 2007 持续时间依照输电导则2007的规定 3
LVRT Workshop Beijing 06./07. January 2009 Weck: LVRT requirements and testing
LVRT Testing Procedures 低电压穿越测试程序 Requirements on test circuit 对测试电路的要求
Examination of required voltage dips 测验要求的电压跌落
For Example:LVRT Tests required in Germany for symmetrical and unsymmetrical faults 例如：在德国，要进行对称及非对称故障的低电压穿越测试
o Public distribution system公共配电系统: Preferably适宜: o Wind farm system风电场系统: Preferably适宜: ∆umax = 3%: Ssys > 192 MVA Ssys = 320 MVA to(至)640 MVA ∆umax = 10%: Ssys > 54 MVA Ssys = 90 MVA to (至)180 MVA
External triggering by switching sequence control 通过开关程序控制进行外部触发 6
LVRT Workshop Beijing 06./07. January 2009 Weck: LVRT requirements and testing
LVRT Testing Procedures 低电压穿越测试程序 Requirements on Control 对控制的要求
UD is the voltage during fault without WT being connected
UD 是风电机组未接入时故障期间的电压
WT Typ 1: Directly connected synchronous generators 风电机组类型1：直联同步发电机
Test 测试1: Test 测试2: Test 测试3: Test 测试4: UD UD UD UD <= 5%, = 20%-25%, = 45%-55%, = 70%-80%, Duration 持续时间 >= 150 ms Duration 持续时间 >= 150 ms Duration 持续时间 >= 150ms Duration 持续时间 >= 700ms
Three-phase current measurements by current transformers required 使用电流互感器测量三相电流
At low-voltage side of the WT transformer 在风电机组变压器的低压侧 At medium-voltage side of the WT transformer 在风电机组变压器的中压侧 At system side of LVRT test laboratory 在低电压穿越测试设备的系统侧