In order to study the primary resonance and primary parametric resonance of current-carrying conductor subjected to harmonic excitation and ampere force, the Mathieu-equation of the system is derived first.
研究受简谐激励的二长直电流间载流导线的主共振主参数共振问题，应用动力学方法建立载流导线受外部激励和安培力的Mathieau方程。
The magnetic components used in the inverter welding power source, including the middle-frequency swicth transformer, the inductances used in resonance circuit and in direct current, are crucial ones in the power source.
逆变焊接电源磁性元件包括中频开关变压器、谐振电感、输出整流滤波电路中的直流电抗器等，是组成逆变电源的关键元件，对逆变电源的整体性能、体积、质量具有决定性影响。
This paper describes the formation of the harmonic current in trolley wire and the developing process of the harmonic resonance, also the analysis of the transmission equation of the harmonic current.
本文叙述了接触网牵引电流谐波的产生及谐振过程，分析了谐波电流的传输方程。
This paper has carried on deep analysis and studies to various kinds of capacitive current calculation methods of resonance ground system and compensation principles of arc-suppressing coil, and has pointed out the error that they exist in theory and the necessity of reducing the error.
本文对谐振接地系统的多种电容电流计算方法和消弧线圈补偿原理进行了深入的分析与研究，指出了它们在理论上存在的误差及减小误差的必要性。
To compare with the traditional constant current capacitor charging power supply, the series resonance capacitor charging power supply which is developed in recent years has a more constant current, small volume, high efficiency, high power density and its suitable for variable capacitor load in a large range. so it is very suitable for capacitor charging power supply and can satisfy the demand of the repeat frequency pulse power technology.
近年来发展起来的串联谐振充电电源与传统直流电源相比较，具有恒流充电、体积小、效率高、功率密度大、适合宽范围变化的负载等优点，是较为理想的电容器充电电源，能更好的满足当前重复频率脉冲功率技术下对电容器充电电源的要求。
This paper investigates the effect of Si—OH groups on dielectric property and leakage current of the SiCOH low dielectric constant films deposited by decamethylcyclopentasioxane (D5) electron cyclotron resonance plasma.
研究了十甲基环五硅氧烷(D5)的电子回旋共振等离子体沉积的SiCOH薄膜中Si—OH基团对介电性能和漏电流的影响。
In order to eliminate resonance and improve system stability, dual-loop control strategy with grid current feedback and capacitor current feedback was proposed in this paper, where inner capacitor current regulation is adopted for active damping.
研究采用并网电流和电容电流双闭环控制策略对并网电流进行控制，采用电容电流闭环增加系统阻尼，从而可抑制系统振荡，增加系统稳定性。
The purpose: impulse capacitor is for impulse voltage and impulse current generator and resonance circuit.
脉冲电容器用于冲击电压和冲击电流发生器及振荡回路中。
Each capacitor is rated at 1.7nF, 50kV and 12A RMS current, giving the bank an overall capacitance of 0.0068uF, which is less than optimum for mains resonance on the 9kV transformer the single coil uses (I should be using at least 0.0088uF for it), and just slightly larger than resonant on the 12kV transformer used on the twins (0, 0066uF required for mains resonance).
每个电容器的额定电压为1.7nF，50kV及12A RMS电流，使该银行的0.0068uF整体电容，这比水管共振最佳的9kV变压器的单线圈使用（我应该至少使用0.0088uF不足它），只是略大于谐振关于双胞胎的使用12kV的变压器（0，0066超滤水管共振的要求）。
The research progress of novel solid state fault current limiter is narrated in details and its typical topologies, parameter design method, normal operation and fault current limiting control strategies, as well as prototypical experiment results, are summarized. The DC reactor magnetizing transient of the transformer coupling solid state current limiter in double power supplies and the ferromagnetic resonance in the pure capacitance load experiment duo to coil saturation of the coupling transformer both have been discussed in details, also proposed the method and measures to reduce the adverse effect.
对新型固态限流器的研究进展作了详细叙述，总结了新型固态限流器的典型拓扑，参数设计方法，正常运行、故障限流控制策略及样机试验情况等；并对变压器耦合新型固态限流器的直流电感充磁暂态对双端电源系统运行的影响，因耦合变压器饱和在纯电容负载试验中产生铁磁谐振等问题作了详细分析，提出了减小及消除不利影响的方法和措施。
To solve the above problems, a novel resonance injection type hybrid active power filter is presented, it allows the energy exchange between the DC-side capacitor and grid, DC-side voltage will be stabilized after the proposed control method base on the regulation of reactive current is adapted. On the other hand, a new current control method is proposed which is based on the control of error between injection current and harmonic current compensated by passive power filter using recursive PI.
在此基础上结合提出的基于基波无功电流闭环调节的直流侧电压控制方法，保证了直流侧电压的稳定；提出了采用递推积分将无源滤波器作用后电网谐波电流与注入支路补偿电流进行闭环比较控制以获得参考电流的方法，减小了误差，提高了系统的控制精度。
The invention relates to a control method for series compound active electric filter with a base wave by-pass channel, which is used to control the inverter, has no base wave current passing by in the series compound active electric filter in spite of if the electric network and the load are balanced or not, it avoids from the resonance between the base wave by-pass channels and the inverter when it restrains the harmonic wave, thus the capacitance of the inverter and the cost of the machine are decreased, the efficiency of the inverter is upgraded.
带基波旁路通道的串联混合有源电力滤波器控制方法，是要解决不管电网及负载平衡与否，均控制带基波旁路通道的串联混合有源电力滤波器中的逆变器不流过基波电流，在抑制谐波的同时避免基波旁路通道和逆变器发生谐振，从而降低逆变器容量和整机的成本，提高逆变器效率。
This article deals with the study of series resonance type fault current limiter and the new type solid state fault current limiter.
本文重点研究了串联谐振式限流器和新型固态限流器。
The resonance occurring possibility of harmonic current with a harmonic frequency must be considered when reactive compensation was done under the condition of harmonic content less than the national standard permitting value because the resonance may great amplify harmonic current which will damage capacitor and load or even power network.
一般玻璃工厂在谐波含量没有超过国标的情况下做无功补偿时，应考虑谐波电流在某次谐波频率下发生谐振的可能性，因为谐振的发生会使谐波电流大幅度增大，不仅危害电容器，同时对负载和电网产生严重的损坏。
A great amount of shunt capacitor banks are running in power system. Because of their capacitive impedance and their interaction with power system harmonic, the shunt resonance or serial resonance harmonic is produced and the harmonic current enlarged. It will damage capacitors and electrical devices.
在电力系统中运行着大量的并联电容器组，由于电容器组的阻抗呈现容性，它与电力系统中的谐波容易产生相互影响，发生谐波的并联谐振或串联谐振和电容器对谐波电流的谐波放大，造成电容器和电气设备的损坏。
First, based on the theory of electro-mechanical equivalent, the viewpoint that the current in series branch circuit is equivalent to the oscillation velocity is presented. And then, a conclusion is obtained that the dithering of the frequency has least effect on amplitude of the tuning forks oscillation velocity at the series resonance frequency.
首先根据机电等效理论得出陀螺等效电路中串联支路电流等效于音叉振动速度；然后分析了串联支路导纳的幅频特性，得出在串联谐振频率点处音叉振动速度幅值受频率抖动影响最小的结论；但实际求得的谐振频率点与真实谐振频率点之间存在差别。
When inductance of a power supply is decreased or a capacitance is connected in series to the power supply under a certain input voltage, the resonance frequency of plasma aerodynamic actuation system, input current of power supply and discharge current increase, while the discharge voltage of plasma aerodynamic actuator remains stable.
实验结果表明，一定的电源输入电压下，减小电源电感或串联电容分压器，等离子体气动激励系统的谐振频率、电源输入电流和放电电流增大，等离子体气动激励器的放电电压基本保持不变；随着电源频率的增大，等离子体气动激励系统放电有3个典型的方式，电源频率小于谐振频率时，放电电流波形有突变；随着电源频率增大，激励系统的感性不断增大，放电电流增大，电流突变消失；电源频率大于谐振频率后，电容将电压的高次谐波滤掉，放电电流减小。
Although the first thesis on Ferroresonance was published in 1920, FR is still not a fully understood phenomenon. This thesis focuses on single phase FR in Gas Insulated Switchgearwith inductive potential transformers, fed by the circuit breaker grading capacitance. In principle, FR is a forced oscillation in a non-linear series resonance circuit including a capacitance and non-linear inductance, which shows significantly distorted voltage and current waveforms.
中文摘要虽然第一篇有关铁磁共振（Ferroresonance，简称FR）的文献早在1920年即被发表，但是此一特殊的现象至今仍然未被完全了解，本论文将讨论电力系统中之气封绝缘开关设备（Gas Insulated Switchgear，简称GIS），由於断路器的极间电容和电感型比压器（Potential Transformer，简称PT）的非线性电感所构成的单相铁磁共振；理论上，铁磁共振是由电容和非线性电感所构成的非线性串联共振，造成电压和电流波形明显的畸变。
The very high voltage underground distribution system comprises of main transformers, and VHV underground cables among these substations. If the utility outage with open the circuit breakers and switches off the sources of underground cables, most of customers only open their main breakers of main transformers at secondary without open their primary breakers thus the transforms are still connected with cables. So, the resonance between cable capacitance and transformer excitation inductance may be induced. The reason ant frequency is usually lower than the system frequency which has detrimental effects on main transformers and other voltage and current transformers. For this, this thesis is to study the low frequency phenomenon for VHV (161kV) underground distribution system with loop structure, in witch the resonant voltages and currents are investigate with respect to various switching schemes.
特高压地下供电系统包括电力公司及用户，变电所内之主变压器、汇流排及开关操作介於主变电所内之特高压电缆，当电力公司因为人为或天然等灾害导致停电时，特高压地下环路供电之用户主变压器一次侧电源端是未切离的状态，此目的是为了减少特高压开关操作的次数以减少受开关突波的冲击，延长特高压开关的寿命，这使得地下电缆的等效容与变压器激磁电感在系统上发生并联而诱发谐振，因电缆电容很大谐振频率可能低於系统频率，此种低频谐振对变压器及比压器等都有不利的影响，有鉴於此，本论文以典型特高压(161kV)之地下环路供电系统为对象探讨其用户端在谐振时之相电压及谐振电流，考虑各用户主变压器开关不同的切离操作下所造成地下供电环路之谐振影响。
resonance grounding system; arc suppressing coil; on-line running; capacitive current
但是，如何能够进一步地改善消弧线圈自动调谐装置对电网的优化控制、提高电容电流测量的方法和测量精度一直是我们探索的课题