news_news_HaoXin Electric Power

07-03 

±800KV Xiangjiaba——Research on Harmonic Impedance Equivalence of Shanghai UHV DC Transmission Project

According to the planning research results of the Southwest Hydropower Outward Transmission Scheme and combined with relevant foreign research conclusions, ±800KV DC transmission is technically feasible and more suitable for China's actual conditions. Xiangjiaba—Shanghai ±800 UHV DC Transmission Demonstration Project. The converter station access system has complicated boundary conditions. The Jinsha River area power grid has various operating modes. It is possible to reasonably determine the harmonic impedance equivalent parameters for AC filter design. Realize the reasonable configuration of the AC filter scheme and ensure the optimal design of reactive power compensation and control schemes. Therefore, it is necessary to understand the frequency characteristics of the system impedance seen from the AC bus of the converter station to the system, that is, the equivalent harmonic impedance of the converter bus. Commonly used harmonic impedance equivalent tools include ABB's SIMPOW program and Canadian Teshmont's NIMSCAN program. As the NIMSCAN software is similar to the BPA software commonly used in China in the data input format, it has also developed a data conversion and processing interface program, and has successful application experience in the harmonic impedance equivalent of DC engineering converter stations in many countries. ±800KV Xiangjiaba-Shanghai UHV DC transmission project adopts NIMSCAN software to carry out the component parameters of the harmonicator. It is necessary to establish impedance frequency models in the NIMSCAN program, and these parameters are simplified in the routine calculation of the power system. This paper establishes their own impedance frequency models based on the differences in electrical components such as nodes, generators, transformers, lines, etc., and determines the operation mode of the AC/DC system used for harmonic impedance equivalent calculation in Xiangjiaba—Shanghai UHV DC Project. The NIMSCAN program is used to perform the harmonic impedance equivalence and the statistical division of the equivalence results.

07-03 

Railway transportation capacity continues to lean towards thermal coal this year

In order to ensure the supply of thermal coal during the peak summer period of this year, the railway transportation capacity will continue to tilt towards thermal coal this year, using the newly increased capacity after the speed increase, strengthening the transportation organization, and improving the efficiency and level of unloading. The Ministry of Railways requires all units to pay close attention to the dismantling of vehicles. The stations should be quickly resolved, fast-fetched and fast-delivered, speed up the turnover of vehicles, and implement measures that give priority to the transportation of electricity and coal. After the sixth large-scale speed increase and map adjustment of the railway, a batch of harmonious high-power locomotives and 70-ton large-tonnage trucks and other new technical equipment have been put into operation, and the coal transportation capacity of some lines has been significantly improved.

07-03 

Nuclear power "big cake" attracts many companies competing for food

The two-division situation of China National Nuclear Corporation and Chinese Nuclear Corporation no longer exists. Traditional power companies China Power Investment Corporation and China Huaneng Group have also entered the field of nuclear power development. The relevant person in charge of the State Science and Technology Commission recently revealed that in addition to state-owned enterprises that can invest in the development and construction of nuclear power, private and foreign capital can also invest in nuclear power, but they cannot hold controlling shares. Many Chinese and foreign companies have begun to grind their fists, preparing to share a piece of nuclear power.

07-03 

Local power companies leverage on 920 project to expand in other places

The curtain of the 920 project has come to an end, and with the equity auction, the traditional sphere of influence of power generation companies has also quietly changed, and the initiative of local power generation companies has been particularly prominent. Local power groups represented by Guangdong Electric Power and Shenzhen Energy are beginning to expand in different places and are transforming into a national power generation enterprise group. At the beginning of this round of power reform, the power assets of the former State Power Company were allocated to the five major power generation groups. Although a big step has been taken to separate the power plants from the grid, most of the power assets undertaken by a power generation group are in a unified area, which is inevitable. There is a risk of regional monopoly. For power generation companies, this diversified power structure is also not conducive to balancing the operating risks in the region due to market supply and demand. The unveiling of the 920 project undoubtedly provides an opportunity for these landlord power generation companies eager to grow.

Haoxin Electric Machinery