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With the gradual development of affordable Internet access and the stricter assessment of "two rules", on the one hand, photovoltaic power stations need to strictly control the project cost, but also need to carry out fine management. With the help of big data, cloud platform, uav and other technologies, cost reduction and efficiency improvement can be achieved through digital operation and maintenance.
"" 2018 is a relatively big impact for the industry as a whole, but the impact on the digital vision pv sector is not so big, but the scale is doubled. Sun jie, vice President of vision intelligence and general manager of photovoltaic business, said at the second Apollo photovoltaic summit BBS.
This also reflects the industry's demand space for digital operation and maintenance.
In May 2018, the ministry of urban-rural development, housing, the national energy administration department issued "intelligent photovoltaic industry development action plan (2018-2020), plans, structural reforms to boost the supply side to the main line, to build intelligent photovoltaic industry ecological system as the goal, to speed up promoting the manufacture level of photovoltaic industry intelligence, promote Internet, big data, such as artificial intelligence and the depth of the photovoltaic industry, encourage the characteristics of photovoltaic application industry intelligence, promoting China's photovoltaic industry towards a global value chain of high-end.
Operation and maintenance are under pressure
2018 is not going to be easy.
"The beginning of the New Year is a blow to the head. Affected by the heavy snow in east and central China, the electricity loss in the first two months is scheduled to be 5.8%. For the operation and maintenance cost, manpower accounts for the majority, so the loss can only be made up by reducing the manpower cost, so that everyone's workload has increased, all the year round is not in the repair station, or on the road to repair the station. Wang xianwei, head of operation and maintenance department of beikong clean energy power co., LTD., said that after May 31, many engineering companies withdrew from the company, resulting in 3% of the annual loss from June to September. The overall operation and maintenance assessment was just completed on December 25.
Northwest energy watchdog, the northwest power grid based on the actual operation, has been released in the 2015 edition with 2017 edition version two - "the northwest regional power grid operation management rules" and "grid power plant auxiliary services management rules" (that is, the "two rules"), urging provinces according to detailed rules for the new energy terminal appraised, mainly from the prediction system requirements, upload rate prediction results, to examine the theory of power, etc.
The new detailed rules, which were announced in December 2017, are more stringent than the old version. From January 1, 2019, the new "two detailed rules" have been implemented in the northwest region.
"All grid-connected centralized photovoltaic power stations must have a light prediction system. Secondly, in terms of upload stability, short-term and ultra-short-term theoretical power and data should be uploaded every day, some every 5 minutes, some every 15 minutes and some every day. In general, the upload rate cannot be lower than 95%, which is 5 percentage points higher than the old rules. Yao ying, product manager of vision optical power prediction.
The assessment of accuracy of prediction results has the largest variation, including single point deviation of wind power assessment (maximum no more than 25%) and daily root-mean-square error, and monthly mean absolute error of pv assessment, while both wind power and pv will be assessed for single point deviation.
"In accordance with the old rules of photovoltaic (pv) by the day, because is not power, photovoltaic night if power prediction deviation is bigger, can put the accuracy back in the evening, on average, plus or minus is poor, but now under the new rules, light power now follow suit, according to the assessment of each point, report a day 96 points, if 10 hours during the day, an hour to four points, a point prediction deviation of more than 25%, this one point will be fine." "We used to have bad forecasts and a cloud would come and we could use the evening time to bring it up, but now if the forecast is not correct for two hours, then there will be a fine for those two hours," yao said.
The necessity of the assessment lies in balancing the profit distribution between thermal power and new energy and smoothing the output curve of the power grid.
For power station assets, power generation is closely linked to income. If new energy units cannot generate electricity, they will suffer the double loss of subsidy and desulfurization price. To be specific, power generation is the effective solar irradiation multiplied by the overall system efficiency, while the income of photovoltaic power station is the power generation multiplied by the electricity price. However, there are many factors affecting the effective solar irradiation, mainly including weather reasons, such as insufficient irradiation caused by cloudy weather, and system reasons, mainly including component performance, availability, system design problems and other electronic devices.
"The actual amount of electricity generated is the real money and the core consideration for both the investors and the Banks." Jinko energy vice President qian jing has previously said.
"Including developers, EPC and suppliers, the whole power station cannot be formed without capital. As long as the sun comes out, an operational power station should have stable income to achieve a stable repayment cycle, which is the fundamental reason for the financial industry to access the photovoltaic industry. Sun xiaojie, greater China director of the clean energy department under Ariel Re, said: "however, there is still the problem of who will take the bottom of the stable income. Digital operation and maintenance means should be combined with relevant insurance tools to guarantee the yield rate."
Digital operation and maintenance cost dig potential
At the moment, hardware prices, including components, are falling sharply, so there is limited scope for system costs to fall. Facing the pressure of the industrial chain, it is the focus of stakeholders to dig potential cost through digital operation and maintenance.
"After our monitoring, with the area of the distributed power station actual generating hours back by one times, investigate its reason, poor power of photovoltaic power station raw data cannot be powerusageeffectiveness generally on the high side, more than 90% power station in the raw data alarm as invalid alarm and false alarm, because the prediction accuracy is not up to standard, photovoltaic power station each year a large number of fine, an average of 400000 yuan/yard in the northwest area. The two detailed rules for upgrading in the northwest region are also being gradually introduced to the whole country. Vision intelligent photovoltaic solutions director huang xuehong said.
There are many application scenarios of photovoltaic power station, and every scene of roof, water and mountain will meet corresponding challenges. And reducing the loss of power generation is to improve efficiency, this process requires the use of digital operation and maintenance means, can not be generalized.
"In the process of performance optimization management, we should focus on mining various parameters of the power station, not only the normal power generation, but also looking at the data comparison between different equipment, power generation and daily illumination, and different equipment and devices. By means of physical model and data statistics, we should conduct in-depth detection, calculate the power station losses clearly and find the room for improvement. Vision intelligent photovoltaic products technical director zhao lu said.
Zhao said that each power station has a maximum design value, but the actual power generation will be lower than this value. The difference between the theory and practice is the power generation that can be improved, but economic benefits should also be paid attention to. "The closer one part is to the theoretical limit value, the more difficult it is to calculate the lost electricity quantity to reach the most economically beneficial generating capacity. The first step is to decompose the loss, and the second step is to calculate the return cycle. If the return is relatively cost-effective, it is the recommended operation and maintenance item."
At present the industry is tending to parity or even low-cost Internet era, through the fine management to improve investment returns is a very important way. The main beneficiary is the owner of the power station. After a thorough analysis of the performance of the power station, the operation and maintenance team can also be directly assisted in targeted operation and maintenance management. When the power station is thoroughly analyzed, the power station assets can also be fairly evaluated, and in-depth analysis can further reduce project risks and financing costs by combining with the power insurance business, so as to guide future investment decisions and power station design.
However, the high coverage of digital operation and maintenance is still "difficult and long". The reporter learned in the interview that, for some enterprises, the refined operation and maintenance is taken as the initial goal according to their own situation, while the digitalization and intelligence are ranked after the refinement.
Label: affordable online photovoltaic power station digital operation and maintenance
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