指三相电压不平衡将会影响设备安全运行的一种电压不平衡率的保护。
Voltage imbalance protection: While a protection of voltage imbalance rate > 20%, the imbalance of three phase voltage will affect the safe running of the equipment.
本文从原理上分析了电网电压不平衡情况对d -STATCOM的影响。
The influence of the D-STATCOM under the imbalance power grid voltage is studied in this paper.
并指出电压不平衡是由于NPC三电平的特殊结构和电路中的杂散电感造成的。
The proper reasons for the unbalance are the unique structure of NPC three level converters and the parasitic inductance in the circuit.
误差分析表明，偏置电容法在三相电压不平衡度较小时可以满足测量精度的要求。
Error analysis result shows that biased capacitor method can meet the need of measurement accuracy while the unbalance of three phase voltages is relatively small.
提出了一种用于电网侧三相电压不平衡情况下的永磁直驱式风力发电机的逆变控制算法。
This paper presents a new converter control algorithm for the direct drive permanent magnet wind generator under the unbalanced three-phase source voltage.
然而，如果在运行中不能很好的管理，电池会产生如过充、过放和电压不平衡等很严重的问题。
However, it may come into being serious problems if the batteries get improper management during the operation, such as over-charging, over-discharging, imbalance of voltage among the cells.
它涵盖五个方面：供电电压允许偏差、公用电网谐波、三相电压不平衡度、电力系统频率允许偏差、电压允许波动和闪变。
It covers five aspects: supply voltage tolerance, utility harmonic, three-phase voltage unbalance, power system frequency tolerance, voltage fluctuation and flicker.
介绍了中性点不接地系统的几种电压不平衡现象，分析了不平衡现象产生的原因，对于运行中的故障分析具有一定的指导意义。
The article introduces voltage unbalance of neutral non-grounding system, analyzes the cause of voltage unbalance. It is valuable on fault analysis in practice.
压电或储存电荷效应：由于机械应力产生的电荷不平衡(从而产生了电流或电压偏置)。
Piezoelectric or stored charge effects: the creation of charge unbalances (and thus current flow or voltage shift) due to mechanical stress.
考虑到三相电压或多或少有些不平衡，提出了一种新的基于正序基波电压合成相量的发电机并网条件核算法。
Considering the imbalance of three phase voltages, a new arithmetic which verifies the generator paralleling based on the synthetic phasor of positive sequence fundamental voltage is proposed.
就三个变电所CVT故障或异常导致的二次回路电压出现了谐波、三相不平衡及暂态扰动等现象分别进行了分析。
The phenomenon of CVT faults resulting in secondary side voltage harmonics, voltage unbalance or transient disturbance was analyzed in this paper.
该系统可以避免三相不平衡负载对逆变器输出电压的影响。
This system can avoid the influence that three-phase imbalance load towards the output voltage of inverter.
为改善逆变器系统在严重不平衡负载情况下输出电压的对称性，文中提出一种新颖的控制策略——旋转坐标系下的PIR - P双环控制。
This paper presents a new method that PIR-P dual loop control based on rotating coordinates to improve the output voltage symmetry of inverter under the serious unbalanced load condition.
当无功功率不平衡时，将会导致系统电压降低、电能质量下降、功率因数降低、线损增加等问题。
When reactive power is unbalance, it will cause some problems, such as lower voltage, worsen voltage quality, lower power factor and increase line loss.
质量包括电源电压的质量的能力的概念与有关，例如，电压下跌，不平衡，谐波失真，电压波动并且摇曳，等等。
The concept of power quality includes the quality of the supplying voltage with respect to, for instance, voltage sag, imbalance, harmonic distortion, voltage fluctuation and flicker, etc.
冲击性负荷会引起供电系统严重的电压波动和三相不平衡，对其进行平衡化补偿具有重要的意义。
It is important to provide balancing compensation for shock load because of the severe voltage fluctuation and 3-phase unbalance imposed on power supply system by it.
第一章简单介绍了目前电网存在的几种问题，包括谐波问题、无功问题、三相不平衡问题、用电峰谷差过大的问题以及电压异常、断电问题等；
Several issues of power quality are presented, including harmonics, reactive power, three phase unbalance, large difference between peak load and vale load, voltage disturbance and so on.
电网中，由非线性和不平衡负载引起的不平衡和谐波电流将造成谐波和不平衡电压。
In an electrical network, unbalanced and harmonic currents generated by nonlinear and unbalanced loads can cause harmonics and unbalanced voltage.
目前我国电能质量国家标准主要规定了五个指标：频率、谐波、电压偏差、三相不平衡及电压波动与闪变。
At present, our country power quality national standard was chiefly stipulated five quotas: frequency, harmonic and voltage deviation, three-phase unbalance and the voltage fluctuation and flicker.
电网输入电压三相不平衡会严重影响三电平PWM整流器的性能。
The imbalanced three-phase grid voltage will seriously affect the three-level PWM rectifier performance.
对空载、带载情况下变频器产生的不平衡电压和高次谐波的含量进行了测试与分析。
Reference to research status of MDT and by analyzing the special working environment of the ESP, the multi-signal are carried with motor power line.
温度的采集通过不平衡电桥测量铂电阻随温度变化的电压信号来实现。
The value of temperature is collected by measuring the value of the platinum resistance that changes with the temperature in unbalanced bridge.
在此基础上研究了电能质量监测理论，详细介绍了电压电流有效值、功率、三相不平衡度、谐波和闪变的数字测量方法。
Based on this requirement, this paper introduced the theory of power quality monitoring, include RMS of voltage and current, power, three-phase unbalance, harmonic and flicker.
同时本文对电能质量的有关指标：电压偏差、频率偏差、各种功率、谐波含量、电压波动和三相不平衡的计算和检测方法，进行了详尽地阐述。
And some indexes of power quality: voltage deviation, real power, reactive power, harmonic content, voltage fluctuation and unbalanced three-phase voltage and current, are discussed at length.
同时本文对电能质量的有关指标：电压偏差、频率偏差、各种功率、谐波含量、电压波动和三相不平衡的计算和检测方法，进行了详尽地阐述。
And some indexes of power quality: voltage deviation, real power, reactive power, harmonic content, voltage fluctuation and unbalanced three-phase voltage and current, are discussed at length.
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