The relations of inducing skin current of shielding layer, core voltage and core current with the environment field were obtained. The change of shield layer current wave with grounding state of external shield and core voltage with loading resistance was analyzed. According to the dependence of shield layer current oscillating frequency on electromagnetic wave propagation velocity, conception of transporting line of shield layer-ground with equivalent relative dielectric constant was presented. fited equation of equivalent relative dielectric constant with change of cable height was given.

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On the basis, this paper provide two harmonic current detect methods, and do deep research on the using zero current divided method to achieve harmonic current and instantaneous reactive current real time detecting method.

在此基礎(chǔ)上，提出了兩種基于該理論的諧波電流檢測(cè)方法97在线超碰资源在线资，并對(duì)采用零線電流分離法實(shí)現(xiàn)的諧波電流及瞬時(shí)無功電流的實(shí)時(shí)檢測(cè)方法進(jìn)行了深入研究国产成人羞羞爽爽影院视频在线观看。

The results showed that in the four rehabilitated forests, the previous month's soil moisture content had stronger effects on the current month's soil moisture content in 0-40 cm and 20-40 cm layers, but had lesser effects on that in 0-10 cm layer. The soil moisture content in 20-40 cm layer was mainly affected by current month's precipitation, while that in 0-10 cm layer was mainly affected by current month's evaporation. The correlation coefficient between current month's precipitation and soil moisture content was the largest in pure Liquidambar formosana plantation, and the auto-interrelation coefficient of soil moisture content was larger in mixed forests than in pure L. formosana plantation.

結(jié)果表明：研究區(qū)各重建森林前一個(gè)月的土壤含水量對(duì)當(dāng)月整個(gè)土壤剖面(0~40 cm)平均土壤含水量和當(dāng)月20~40 cm土層土壤含水量具有較強(qiáng)影響91免费A级毛片，對(duì)當(dāng)月0~10 cm土層土壤含水量的影響較小日韩欧美在线一区二区；研究區(qū)各重建森林20~40 cm土層土壤含水量主要受當(dāng)月降水量的影響天天摸天天爽视频69视频，0~10 cm土層土壤含水量主要受當(dāng)月蒸發(fā)量的影響；在4種森林重建模式中国产一级Av免费无码，楓香純林當(dāng)月降水量與當(dāng)月土壤含水量的相關(guān)系數(shù)最大人人摸操人人操摸，混交林模式土壤含水量的自相關(guān)系數(shù)大于純林模式。

To improve accuracy of detection of current direction, components of magnetizing current and torque current are transformed into two-phase stationary frame. Therefore compensating voltage vector can be decided according to the sector the current vector is locating.

為了提高電流極性檢測(cè)的準(zhǔn)確性最新免费一区二区在线观看，利用旋轉(zhuǎn)軸系中的勵(lì)磁電流和轉(zhuǎn)矩電流分量經(jīng)過坐標(biāo)反變換国产AV自拍网站导航，判斷電流在兩相靜止軸系所處的扇區(qū)來決定需要施加的補(bǔ)償電壓。

Because the magnetoelectricity characteristic of TA is not linear, huge short-circuit current or large nonperiodic current may make the TA enter the saturated state, which cause the exportation current of the TA very small, making the busbar differential current very large.

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This paper analyzes the numerical control DC constant current source system design needs, expounded numerical-controlled DC constant current source of the hardware and software design principles, instructed the numerical-controlled DC constant current source circuit of the module function and design ideas, completed the numerical-controlled DC current source of all design, and the circuit is complete and procedures.

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In the PEMFC system, the oscillogram of the current is stable while the current is 1A; however, when the current is changed into 2.1A (subject to the power is 230W), the current output fluctuates and twists. After comparing the result generated from the simulation test of PSIM and experiment with the real data, this theory of the dissertation is proved to be workable.

本論文之研制之質(zhì)子交換膜燃料電池電能轉(zhuǎn)換系統(tǒng)，當(dāng)電流為1A與1.9A時(shí)亚洲区小说区，電流波形圖相當(dāng)穩(wěn)定a片网站在线视频观看，而當(dāng)電流改變成2.1A時(shí)，此時(shí)功率約為230W三级片天天操夜夜操，其輸出電流波形及產(chǎn)生扭曲變形較不穩(wěn)定中国老女人特级毛片在线视频，經(jīng)由PSIM軟體模擬與實(shí)驗(yàn)比較得出穩(wěn)定燃料電池發(fā)電系統(tǒng)，并且與實(shí)際量測(cè)結(jié)果互相比較中国精品黄片，以驗(yàn)證本文研究系統(tǒng)之可行性久久久久久久久久久精品人妻。

The analysis results show that PAPF is effective for parallel resonance damping, but can not damp series resonance when capacitor current is not included in the detecting current. And when capacitor current is included in the detecting current, PAPF is prone to be unstable and can not damp parallel and series resonance.

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Three reference current detecting methods are presented for single-phase active power filter, i.e. fundamental current detecting method based on parallel resonance of passive LC filter, fundamental current detecting method based on switched-capacitor filter, harmonic current detecting method based on d-q transformation and its improved circuits.

同樣通過采用并聯(lián)變壓器二次側(cè)多補(bǔ)償繞組的結(jié)構(gòu)來提高有源電力濾波器的容量噜噜色噜噜。4激情。com、提出三種單相有源電力濾波器指令電流的提取方法，即基于LC并聯(lián)諧振的基波電流檢測(cè)方法www小视频在线观看、基于開關(guān)電容濾波器的基波電流檢測(cè)方法国产黄色A片20分钟、基于單相d-q變換的諧波電流檢測(cè)方法及其改進(jìn)電路。

After the tripped phase current from shunt reactor was calculated using the transient fault model as the prototype whether transient or permanent fault, the difference between the calculated current and the measured one of the fault phase from shunt reactor was employed to identify permanent fault. When the single-phase fault is transient, the calculated current is close to the actual measured current.

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