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      Energy saving of smart grid and distribution network

      Energy saving of smart grid and distribution network

      Smart grid: energy transformation requires more intelligent power grid construction. During the 14th five year plan, the investment scale of the grid exceeds 6 trillion, and the smart grid meets the market space of hundreds of billion. During the 13th Five Year Plan period (2016-2020), China's grid investment was 2.6 trillion, which was nearly 60% higher than that of 1.6 trillion in the 12th Five Year Plan period. The scale of China's power system is expanding. According to the chairman of the State Grid, under the background of carbon neutral energy transformation, the investment scale of power grid in China during the 14th Five Year Plan period may exceed 6 trillion, and the market space is broad. Facing the huge scale power system, it is necessary to improve the intelligence of the power system, so as to make the power system more efficient. Smart grid is to take UHV grid as backbone grid, use advanced technology to build a power grid system based on information. Its essence is to solve the related problems existing in energy supply side by intelligent construction of power transmission and distribution links. Specifically, smart grid has three tasks: 1) Ensure that the energy allocation work is completed smoothly. Smart grid needs to transport clean energy (photovoltaic, wind power, etc.) in the west to the East and central load center, and carry out intelligent adjustment and configuration to complete the large-scale and efficient consumption of clean energy. 2) To ensure the safety and stability of energy supply. After the clean energy is incorporated into the power system in a large range, the smart grid should adjust the peak load according to the power consumption in different regions and different times to ensure the power supply of the whole country. 3) Reduce the loss in the process of energy supply. The energy saving of distribution network can improve the distribution of power grid resources and reduce unnecessary losses. From 2016 to 2020, the construction of smart grid has entered a high-speed development period, with a total planned investment of RMB 1.4 trillion, of which 175billion yuan is invested in intelligent planning, accounting for 12.5%. During the 14th five year plan, the industrial scale of smart grid will reach a trillion levels, with a compound growth rate of about 20%. Energy saving of distribution network: help the power sector to neutralize carbon, with an annual market space of more than 40 billion. The power industry is the main carbon emission source in China, accounting for more than 50% in 2018, and it is the key emission reduction department to achieve the carbon neutralization target. In addition, the target of power sector emission reduction is more than 40% of the energy activities, which is the most important task in the process of carbon neutralization. The energy saving of distribution network can help the power department to decarbonize deeply: energy saving of distribution network can reduce the energy-saving loss of distribution network, and provide energy saving transformation and comprehensive energy efficiency treatment solution; It can effectively solve the problems of high line loss rate (the more can reduce 30%), and the greater the reactive power loss. Therefore, in the background of carbon neutralization, the energy saving of distribution network can effectively help the distribution network to save energy with low loss and help the power department to decarbonize in depth. According to the current development progress, China's line loss rate in 2019 is 5.9%, which is still a gap with the international leading level: the average line loss rate in Japan, Korea and Germany in 2012 is 4.12%. This means that there is still a large space for energy conservation of domestic distribution network.
      The problem of power supply connection in incremental distribution network received official feedback

      The problem of power supply connection in incremental distribution network received official feedback

      "Renewable energy within the distribution area and within a reasonable range around the distribution area is allowed to be connected to the incremental distribution network at an appropriate voltage level." Recently, the national development and Reform Commission said in the reply to the "eight suggestions on further improving and implementing the reform policy of incremental distribution business" (hereinafter referred to as the "reply"). The reporter noted that the national development and Reform Commission and the National Energy Administration issued the "management measures for orderly opening of distribution network business" as early as 2016, the "notice on developing pilot market-oriented trading of distributed generation" issued in 2017, and the "notice on actively promoting the work of wind power and photovoltaic power generation on the grid without subsidy and parity" issued in 2019, The policies of incremental distribution network access to renewable energy and distributed energy are clarified, but few pilot projects of incremental distribution network access are successful. "This is undoubtedly a ray of dawn urgently needed in the incremental distribution reform." Many incremental distribution owners who heard the news sighed: "this is the second time that the national development and Reform Commission has made a detailed and clear decision on the access issue." Clearer policies boost owners' confidence The reply clearly supports the coordinated development of incremental distribution network, distributed generation, microgrid and integrated energy; For the distributed generation included in the national pilot demonstration in the incremental distribution network, the electricity transaction can be free of the transmission fee that does not involve the previous voltage level, and the standard of network passing fee is determined by the provincial price department according to the access voltage level and the scope of transmission and power consumption. Chen Jian, chairman of Liaoning Lvyuan, told reporters that the "reply" further clarified the dominant position of the incremental distribution network "network", allowing renewable energy access within the incremental distribution network area and within a reasonable range around, and also clarified the standard of "network passing fee". If the access does not involve the voltage of the previous level, the power transmission fee can be exempted. According to Wu Junhong, director of Smart Energy Office of East China Electric Power Design Institute, the "reply" has boosted the confidence of practitioners of incremental distribution reform“ The national development and Reform Commission (NDRC) and the National Energy Administration (NEA) have studied and replied this time, indicating that the government departments pay close attention to the practical problems encountered in the incremental distribution reform. For example, for the price mechanism of the incremental distribution network, the reply has made it clear that the relevant policies will be further improved. " Zhan Shuguang, a lawyer from Beijing Xinnuo law firm, said: "the policy of renewable energy and distributed generation access to incremental distribution network has existed for a long time, but it is not specific and clear stated in the reply, which leads to deviations in the process of policy implementation《 "The letter of reply is good for reform, but its implementation depends on whether the supporting policies and measures can be implemented at the same time." Barriers to renewable energy access Since 2016, several documents of the national development and Reform Commission and the national energy administration have made clear the relevant rules and regulations for incremental distribution network access to renewable energy and distributed power. Why hasn't a pilot project been successfully accessed so far? How many hurdles do you need to overcome if you want to successfully access? A pilot owner of incremental power distribution in North China, who did not want to be named, told the reporter: "in order to access renewable energy, power grid enterprises need to issue a consumption report. The report has been unable to come down. Even the renewable energy projects in the region can not be connected to the grid for a long time." Wu Junhong said that at present, such power supply is still facing a series of practical operation problems when it is connected to the incremental distribution network“ How should incremental distribution network pay for subsidized renewable energy projects? In addition to the renewable energy projects with clear nature of wind power and photovoltaic, how to define the types of comprehensive energy projects that meet the access conditions? Is the distributed energy or new energy power stations around the incremental distribution network allowed to access the incremental distribution network nearby? How to define the reasonable scope of the surrounding ar
      The first batch of overvoltage active intervention system in Xinjiang distribution network put into operation

      The first batch of overvoltage active intervention system in Xinjiang distribution network put into operation

      "Background data is uploaded correctly and can be monitored in real time." On March 15, zhaowenchang, a staff member of Changji power supply company in Xinjiang, said in a background data transmission test at 110kV Daxiqu substation. This marks the first batch of active interference system of over voltage in Xinjiang distribution network, which is put into operation in Changji, Xinjiang. It is reported that most of the power systems under 35 kV in China adopt neutral point ungrounded operation mode. If the line is grounded instantaneously due to lightning stroke or other reasons, the sound phase voltage will rise suddenly and generate a large inrush current, which will cause the voltage transformer to burn down, and the people's livelihood power and the safety of the power network can not be guaranteed. The project adopts fast algorithm, fast response speed and obvious intervention effect, which can effectively solve the frequent fuse fuse problem of voltage transformer, ensure that there is no leakage judgment and improve the reliable operation of the power grid. Meanwhile, the project adopts wireless transmission and high-speed transmission of 4G and 5g network to achieve the function of remote online monitoring. The staff of the company can not leave home to understand the operation status of the equipment, make up the blank of electromagnetic voltage transformer in this field, record the fault waveform, and then accurately judge the fault type, greatly reducing the failure rate of the equipment. At present, the device has been installed and used in 10 substations in Changji District, Xinjiang, and has achieved good application results. The operation of the device means that the staff can monitor the operation status of the equipment in the substation remotely and make fault prediction by real-time data, ensure the residents safe and stable power consumption in 24 hours, and improve the reliability of the substation equipment operation.
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