Two tell you why the transmission and distribution costs need to be further reduced
The National Energy Administration issued the “Regulations on the Investment Efficiency of Ten Typical Power Grid Projects Such as Zhejiang Ford High-Voltage Exchangeâ€, which showed that the transmission efficiency of some projects did not fully utilize the transmission and distribution costs to be further reduced.
Project management is not standardized enough, etc.Recently, the National Energy Administration issued the “Regulations on the Investment Efficiency of Ten Typical Power Grid Projects Such as Zhejiang Ford High-Voltage Exchange†(hereinafter referred to as “Reportâ€), and 10 typical examples of Zhejiang Express Power Exchange from the aspects of planning implementation, operational effectiveness and investment efficiency. A comprehensive analysis of the investment performance of the power grid project from commissioning to June 2017 was conducted, and some of the DC projects examined in previous years were “reviewedâ€.
The 10 typical power grid projects are specifically: Zhebei-Fuzhou UHV AC transmission and transformation project, Haminan-Zhengzhou ±800kV UHV DC transmission project, Xiluodu left bank-Zhejiang Jinhua ±800kV UHV DC transmission project, Nuozhadu Hydropower Station Power transmission Guangdong ±800kV UHV DC transmission project, Lanzhou East ~ Tianshui ~ Baoji 750kV double-return transmission and transformation project, Xiluodu power station transmission Guangdong ± 500kV DC transmission project, Minqin Hongshagang wind power base 330kV delivery project, Tangshan Laoting 500kV power transmission and transformation project, Inner Mongolia Wuchuan ~ Chayouzhong Banner ~ Khanhai 500kV power transmission and transformation project, Zhejiang 500kV Tianyi ~ Chunxiao III power transmission and transformation project, State Grid Corporation, China Southern Power Grid Corporation and Inner Mongolia Power Company respectively bear 7 Investment in the construction of projects, 2 projects and 1 project.
According to the "Report", most of the 10 typical power grid projects examined have achieved the expected functions of the design, and the overall operation is good, but some projects have low power transmission, high transmission loss, and some reliability indicators are slightly lower. At the national average level; all project construction costs have not exceeded the approved investment, but some projects have exceeded the approved scale or investment; most of the project construction procedures are reasonable, and individual projects have started construction illegally before obtaining approval opinions. At the same time, the seven “look back†projects generally performed well and the operational benefits were gradually stable, but the average utilization hours of most DC projects was less than 5,000 hours.
Some project transmission benefits have not been fully utilized, and operational efficiency needs to be improved.According to the "Report", due to the high load forecast, large changes in market supply and demand, and uncoordinated engineering construction and power development, the maximum transmission power after some projects have been put into operation has not been as expected, and the transmission capacity is not fully utilized. The number is low and the transmission efficiency is not fully utilized. For example, the average power of Zhefu Engineering in 2015 and 2016 was 18.28 and 194,600 kilowatts, respectively, which were 3.6% and 3.8% of the design capacity respectively; the annual utilization hours were 314 and 334 hours respectively.
In addition, some cases of forced outage and unipolar forced outage of some of the valve groups in Hazheng, Xizhe, Zhazha, and Xiluodu projects, some of the annual forced energy unavailability rates are high, resulting in some reliability indicators lower than the national average. Level, operational efficiency needs to be further improved. According to statistics, in 2016, the forced energy unavailability rate of Hazheng project was 0.18%, the forced energy unavailability rate of the Zhazadu project was 0.3%, and the forced energy unavailability rate of Xiluodu project was 0.3%, both higher than 0. 061% of the national level over the same period. In order to improve the efficiency of power grid engineering, the "Report" suggests that power grid enterprises should comprehensively and scientifically do a good job in the feasibility study of new projects in the early stage on the basis of summarizing relevant major engineering experiences. In particular, combined with the national economy and local development, carefully carry out the load forecasting work, scientifically analyze the impact of the electromagnetic ring network on the stability of the power grid and the transmission capacity, comprehensively demonstrate the impact of the major project placement on the transmission and reception network, and fully discuss the project after the operation. Risks and bottlenecks are faced, and the actual transport capacity that can be achieved after the project is put into operation is objectively evaluated to avoid inefficient operation after the project is actually put into operation.
At the same time, power grid enterprises should strengthen the analysis and summary of the reasons for forced outage in the transmission and DC project, and propose solutions for common problems. Improve the operation and maintenance management capability of the DC project, improve the DC project operation control strategy, reduce the project's forced energy unavailability, ensure the engineering reliability index, and continuously improve the project operation effectiveness.
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