会计学什么是低电压穿越？LVRT：LowVoltageRideThrough当电网故障或扰动引起风电场并网点的电压跌落时，在一定电压跌落的范围内，风电机组能够不间断并网运行(yùnxíng)。Windturbinesshouldstayconnectedtothenetworkandkeepoperationfollowingvoltagedipscausedbyshort-circuitonanyorallphases,wherethevoltagemeasuredattheHVterminalsofthegridconnectedtransformerremainsabovethepredefinedvoltageprofile.也有故障穿越的提法。FRT：FaultRideThrough由于风电机组一般采用异步发电机技术（丹麦概念），电网发生故障时机端电压难以建立，若风电机组继续(jìxù)挂网运行，将会影响到电网电压无法恢复，因此，电网发生故障出现电压跌落时，一般都是采取切除风电机组的方法来处理。InductionmachineisusallyusedinDenmarkConceptWindTurbines,theactiveexcitingcannotbeprovidedby.Thevoltagecannotberecoveredifthewindturbinestillkeepoperatingsothewindturbinemustbetrippedincaseofvoltagedipsduringthegridfault.风电装机比例较低时：可以允许风电场在电网(diànwǎng)发生故障及扰动时切除，不会引起严重后果。ThewindpenetrationislowThetripofwindfarm(windtrubine)duringpowergriddisturbancescanbeacceptable.It‘snotabigproblemtothepowersystem.风电装机比例较高时：高风速期间(qījiān)，由于输电网故障引起的大量风电切除会导致系统潮流的大幅变化甚至可能引起大面积的停电，而带来频率的稳定问题。低电压穿越能力是必需的ThewindpenetrationishighLargescalewindfarm(windturbine)trippingwillcauseloadflowchangingviolentlyevenpowersystemblackout.Thefrequecystabilityissueisthemostconcernbecausethepowerlossescouldleadtoinstability.LVRTisnecessary.风电装机比例较低时：可以允许风电场在电网发生故障(gùzhàng)及扰动时切除，不会引起严重后果。ThewindpenetrationislowThetripofwindfarm(windtrubine)duringpowergriddisturbancescanbeacceptable.It‘snotabigproblemtothepowersystem.高风电穿透(chuāntòu)功率情况下，故障导致的电压跌落更为严重。Voltagedipswillbemoresevereduringhighwindpenetration2004-12-14系统中某节点电压跌落(diēluò)的严重程度与此节点距离故障点的电气距离远近此节点固有的无功电压支撑能力风电功率的高低密切相关ThevoltagedipextentofspecificbusbarhavecloselyrelatedwithElectricaldistancetothefaultlocationVoltagesupportcapabilityofthespecificbusbarWindPoweroutput电网发生电压跌落对风电机组的影响机械(jīxiè)、电气功率的不平衡影响机组稳定运行暂态过程导致发电机中出现过流，可能损坏器件附加的转矩、应力可能损坏机械(jīxiè)部分TheimpactonwindturbineofvoltagedipsUnbanlancetorquemayinfluncethestableoperationofwindturbineOvercurrentofgeneratorintransientmaydamagetheElectronicscomponents.Additionaltorqueorforcesmaydamagethemechanicalcomponents.不同电