本文選題：電流互感器 + 輸電線纜��； 參考：《浙江大學(xué)》2015年碩士論文

【摘要】：隨著電力工業(yè)和智能電網(wǎng)產(chǎn)業(yè)的發(fā)展,對高壓輸電線纜的運(yùn)行狀態(tài)進(jìn)行實(shí)時(shí)監(jiān)測交得至關(guān)重要,為此需要在輸電線纜周圍部署大量的監(jiān)測設(shè)備。然而輸電線纜分布廣闊且很多位于野外或地下,其周圍一般沒有常規(guī)電源,因此需設(shè)計(jì)特殊的電源為這些監(jiān)測設(shè)備供電。在各種特殊電源中,使用電流互感器將原邊即輸電線纜的電流感應(yīng)到副邊為監(jiān)測設(shè)備供電的電源能夠提供的功率最大；但由于輸電線纜電流變化范圍極為寬泛,這種電流互感器取電電源存在原邊電流小時(shí)供能不足和原邊電流大時(shí)輸出電壓失控的問題。針對這些問題,本文對電流互感器取電電源在以下三個(gè)方面進(jìn)行了研究,并將研究結(jié)果應(yīng)用到了取電電源的設(shè)計(jì)中： 首先,針對原邊電流小時(shí)取電功率不足的問題,采取在電流互感器副邊并聯(lián)匹配電容的措施,顯著增大了它的取電功率；并在電流互感器的參數(shù)已知或可測量的前提下,對它能夠從某一特定的低原邊電流取得的最大功率以及取得最大功率時(shí)電流互感器的副邊電壓、匹配電容容值等進(jìn)行了定量的分析和計(jì)算,以便合理設(shè)計(jì)取電電源的電氣參數(shù),使之在原邊電流為這一特定值時(shí)取得最大功率,滿足輸電線纜監(jiān)測設(shè)備的需要。 其次,針對原邊電流大時(shí)取電電源輸出電壓失控的問題,在電流互感器副邊并聯(lián)旁路開關(guān),并在每個(gè)原邊電流周期內(nèi)將其閉合一段時(shí)間,以將電流互感器的副邊短路,中斷它向取電電源的供電。為簡化取電電源的硬件電路設(shè)計(jì),采用將旁路開關(guān)集成到橋臂中的整流電路實(shí)現(xiàn)上述功能,提出了這一整流電路的一種控制方法,并對該整流電路在這種控制方法下的工作過程做了詳細(xì)分析。此外,對取電電源的整流電路使用其他結(jié)構(gòu)和控制方法時(shí)的工作過程和電路特性也做了討論。 最后,針對原邊電流比上述特定值更低時(shí)取電電源的輸出功率不足,無法保證對輸電線纜監(jiān)測設(shè)備正常供電的問題,起用后備電池和取電電源一同向監(jiān)測設(shè)備供電,并使取電電源輸出最大的功率,以減少對后備電池的依賴。經(jīng)過分析比較,選擇了Buck-Boost或Flyback拓?fù)渥鳛槿‰婋娫吹暮蠹塂C-DC變換器,使得在原邊電流波動時(shí),后級DC-DC變換器輸出最大功率所需的占空比幾乎保持不變,簡化了DC-DC變換器的設(shè)計(jì)。
[Abstract]:With the development of power industry and smart grid industry, it is very important to monitor the running state of HV transmission cable in real time, so it is necessary to deploy a large number of monitoring equipment around the transmission cable. However, transmission cables are widely distributed and many of them are located in the field or underground, and there is usually no conventional power supply around them. Therefore, special power supply is needed to supply these monitoring equipment. Among all kinds of special power sources, current transformer is used to induce the current of the original side, the transmission cable, to the power supply supplied to the monitoring equipment by the secondary edge. However, because of the wide range of current variation of the transmission cable, The current transformer power supply has the problems of insufficient energy supply at the primary side current and out of control output voltage when the primary current is large. Aiming at these problems, this paper studies the current transformer power supply in the following three aspects, and applies the research results to the design of the power supply. Taking the measure of matching capacitance in parallel at the side of the current transformer, the power of the current transformer is increased significantly, and the parameters of the current transformer are known or can be measured. The maximum power which can be obtained from a particular low primary current and the secondary voltage of the current transformer and the capacitance capacity of the current transformer are quantitatively analyzed and calculated in order to reasonably design the electrical parameters of the power supply. The maximum power is obtained when the original side current is this particular value, which meets the needs of transmission cable monitoring equipment. Secondly, aiming at the problem that the output voltage of the current source is out of control when the primary current is large, the bypass switch is paralleled at the secondary side of the current transformer, and it is closed for a period of time during each primary current cycle to short-circuit the secondary edge of the current transformer. Interrupt its power supply to the power supply. In order to simplify the design of the hardware circuit of the power supply, the rectifier circuit which integrates the by-pass switch into the bridge arm is used to realize the above function. A control method of the rectifier circuit is proposed. The working process of the rectifier circuit under this control method is analyzed in detail. In addition, the working process and circuit characteristics of rectifier circuit with other structures and control methods are also discussed. Finally, in view of the problem that the output power of the power supply is insufficient when the original current is lower than the above specific value, it is impossible to guarantee the normal power supply to the monitoring equipment of the transmission line cable, so the backup battery and the power source are used to supply the power to the monitoring equipment together. And make the power supply output maximum power to reduce the dependence on the backup battery. After analysis and comparison, the Buck-Boost or Flyback topology is selected as the back stage DC-DC converter, which makes the duty cycle of the maximum output power of the back-stage DC-DC converter almost unchanged when the primary current fluctuates, and simplifies the design of the DC-DC converter.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM452;TM46

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李先志;杜林;陳偉根;王有元;孫才新;李t熝，

本文編號：2063463