With the development of China's economy in recent years and the acceleration of distribution network construction, small hydropower in mountainous areas has been increasing year by year. At present, the voltage regulation capability of mountainous distribution networks is relatively low. Due to the seasonal characteristics of small hydropower, the electric energy generated during the flood season cannot be balanced locally, so high voltage phenomena of different degrees will occur around the distribution area. It affects the user's electricity consumption and even damages the electrical equipment; while the mountainous line often has a long supply radius and the load is concentrated at the end of the line. When the dry season, there will be different levels of low voltage at the end of the line. Therefore, how to solve the high voltage and low voltage problems of distribution network lines with small hydropower systems is a key and difficult point in the current distribution network construction. The line conductors are usually inductive, and the length of the line is proportional to the inductive impedance. Therefore, the longer the line, the more severe the voltage drop at the end, and the lower the power transmission capacity. Especially in the case where the end load distribution is large, the phenomenon of low voltage is also more obvious. For small hydropower lines, reasonable control measures are essential to ensure voltage quality. Some of the current measures are basically based on voltage regulation using voltage regulators. At present, the commonly used voltage regulation methods are: on-load voltage regulation; shunt capacitor voltage regulator; shunt reactance voltage regulator; regulating user transformer tap; centralized substation voltage regulation. Although these measures can play a role in voltage improvement to a certain extent, the operation steps are cumbersome, the equipment efficiency is low, and the loss is high. For example, commonly used voltage regulators: 1. The device itself has a certain loss, frequent use will also lead to transformer failure; 2. Device tap adjustment takes time, so the voltage adjustment is not real-time; 3. The adjustment range has certain limitations Sex, for some specific situations, it is impossible to adjust the voltage to the ideal level; 4. It requires more operation management and personnel operation, and the use efficiency is not high. 5. In a line with a voltage regulator, electrical equipment may experience frequent and prolonged overvoltages due to single-phase ground faults. Compared with the above-mentioned series of traditional measures, intelligent distribution network series compensation technology is an emerging means to solve the distribution network voltage quality problem, with the following unique technical and economic advantages: 1. The effect of improving the voltage is more obvious, that is, the more serious the phenomenon of low voltage or high voltage of the line, the use effect of the network matching is often better. 2. The compensation effect is adaptive to the change of load, and the real-time response has no time lag. Moreover, the series compensation device does not need to perform switching according to the change of the load condition, and the compensation effect cannot be achieved when the load is heavy, and the problem of over compensation when the load is light load is not generated. 3. The intelligent distribution network series compensation device is not affected by single-phase grounding short circuit. 4. The distribution network series compensation device can not only improve the voltage, but also has the effect of improving the power factor, reducing the line loss, suppressing the voltage flicker and the like. 5. The energy saving effect is remarkable, only reducing the line loss. Usually, the equipment investment of the intelligent distribution network series compensation device can be recovered within 1~2 years. Based on the series compensation technology to improve the power quality of the distribution network line and the successful engineering experience of the smart distribution network series compensation device that has been put into operation so far, Zhejiang Guirong Harmonic Technology Co., Ltd. (referred to as "Guo Rong Harmony") and State Grid Zhejiang Jinyun Power Supply Co., Ltd. jointly researched and established a special project to address the situation that there are many local small hydropower distributions and the power quality problems of distribution network lines are increasingly prominent. Fully researched on the typical lines of small hydropower access distribution networks selected by both parties, and collected a large amount of operational data for in-depth theoretical analysis and system simulation research. After several months of joint efforts, both the system simulation results and the actual case calculations confirmed that the distribution network series compensation technology can effectively solve the problem of seasonal voltage failure in the selected line, that is, the same intelligent distribution network series compensation device can be used. Solving the low voltage problem caused by the long supply radius, it can also solve the high voltage phenomenon caused by small hydropower generation during the flood season. Based on this special study, the local power sector plans to further promote the practical engineering application of the intelligent distribution network series compensation device on the distribution line of small hydropower in the region. It can be foreseen that the intelligent distribution network series compensation technology meets the increasing demand for comprehensive management of voltage quality in the development of small hydropower in China, and has high engineering application value and market promotion prospects.
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