Main indexes of technical character

Main indexes of technical characteristics of distribution network. The construction of distribution network must meet the security and stability requirements of power grid. When different investment strategies are adopted, the technical level will be different, which will affect the investment decision. Through the identification and analysis of the influencing factors, the technical factors are divided intoNo matter what kind of investment strategy is adopted, the distribution network project must be able to ensure that the power supply demand in the park is met and guaranteed. The main factors affecting the power supply of distribution network include load rate and distribution capacity.Load rateThe load rate reflects the ratio of the average load to the maximum load of the grid during the calculation period Power load can be used to guide the construction planning and dispatching control of power grid. On the one hand, the size of load rate determines the utilization rate of grid assets, which affects the income of grid investment, on the other hand, reflects the level of grid planning and scheduling If the load rate is too low, it means that the power grid construction is redundant and there is a certain waste of investment If the load rate is too high, it means that the grid investment is insufficient, and the safe and stable operation of the grid will also be challenged.② power distribution capacityThe distribution capacity is the maximum power supply capacity of the distribution network, which refers to the maximum load supply capacity of the distribution network in a certain power supply area that meets the N-1 safety criteria (including the main transformer and feeder n-1 safety) and various practical operation constraints.On the basis of meeting the power demand, another task of distribution network is to ensure the stability, security and reliability of power supply. Therefore, when choosing investment strategies, the power quality under different strategies should be taken as reference factors. Power quality is usually represented by two indicators, voltage and frequency.Voltage qualification rate refers to the percentage of the total time of monitoring point voltage in the total monitoring time in the normal operation of power grid Generally, one month is used as the monitoring period Voltage passing rate is an important power quality index reflecting the voltage deviation of power supply High voltage passing rate means good power quality, and vice versa, poor power quality.Frequency passing rate refers to the total time percentage of normal operation of the power grid. The frequency of monitoring points is within the qualified range, and the monitoring cycle can be weekly, monthly and quarterly. Frequency passing rate is also an important power quality index. If the frequency passing rate is high, the power quality is good, otherwise the power quality is poor.Economic operation considers the economy and high-quality operation of distribution network equipment and network, and good economic operation will improve the profitability of investment. The economic operation index mainly considers the line loss rate of distribution network The power loss in distribution chain is called the power loss of distribution network. In the same measurement cycle,The new project of distribution network needs to consider the impact of new access park on the overall security and stability of the power grid Projects that have a significant impact on grid security need to weigh gains and losses. Safety and reliability are mainly expressed by "n-1" passing rate The passing rate of distribution network "n-1" is distribution network n-1The risk factors that affect the selection of investment strategy of distribution network equipment include financing risk, construction risk, environmental risk, market risk, technical risk, default risk and disposal risk. Next, we will analyze the contents of each risk separately.