Environmental adaptability analysis of energy storage equipment in deserts, Gobi, deserts and other areas
In the desert, the Gobi, desert areas building wind and photovoltaic base projects is the main way to develop centralized new energy, while through the supporting construction of energy storage to achieve efficient utilization of new energy, clean power of the new energy base can be sent to the load terminal through UHV lines, through the construction of energy storage at the source can improve the power quality and transmission efficiency of new energy power generation.In November 2021, the National Energy Administration and the National Development and Reform Commission issued the "Notice of the First List of Large-scale Wind Power and Photovoltaic Base Construction Projects Focusing on Desert, Gobi and Desert Areas", involving 19 provinces and a total scale of 97.05GW; In December 2021, the National Energy Administration once again issued the "Notice on Organizing the Second Batch of Large-scale Wind Power photovoltaic Base Projects Focusing on Desert, Gobi, and Desert Areas" to accelerate the construction of wind and solar power base projects.This month, the National Development and Reform Commission publicly stated that it will vigorously promote the construction of large-scale wind power photovoltaic bases focusing on the desert, Gobi and desert areas, and the first batch of projects has started more than 95GW, the first batch of projects have basically started, and the second batch of base projects have also been started.Desert, Gobi, desert areas as the "main battlefield" of new energy construction, its site to Qinghai, Ningxia, Inner Mongolia, Gansu, Xinjiang, Shaanxi and other northwest regions, the natural environment is relatively complex and harsh, often facing high altitude, low temperature, strong wind and sand, and other special environment impacts, the environmental adaptability of energy storage equipment also put forward special requirements.High altitude refers to areas above 1000 meters above sea level, for example, the altitude in Qinghai is generally around 3000 meters. With the increase of altitude, the air thinning and air pressure decrease, the strength of the external insulator of the electrical appliance decreases, the live gap of the external insulation surface and different potentials is easy to break down, and at the same time, for the switching appliance with air as the arc extinguishing medium, the arc extinguishing ability decreases, resulting in a decrease in the on-off ability. Therefore, electrical design and equipment selection need to consider the influence of high altitude factors. According to the requirements of the regulations, when the altitude is higher than 1000 meters but less than 4000 meters, for every 100 meters increase in altitude, the external insulation strength is reduced by about 1%, so it is generally necessary to strengthen the insulation or adopt high prototype electrical equipment. At the same time, the safety net distance of electrical equipment also needs to be corrected according to the altitude.For example, at altitudes below 1000 meters, the minimum safety net distance between and relative to 35kV outdoor power distribution devices is 400mm; The minimum safe net distance between phases and relatives at an altitude of 2000 meters needs to be corrected to 440 mm; The minimum safe net distance between phases and relatives at altitudes of 3000 m needs to be corrected to 470 mm.The minimum temperature in winter in cold areas such as Inner Mongolia, Xinjiang, Qinghai and so on is usually below -20 °C, and the extremely low temperature can reach about -40 °C. As we all know, the low-temperature performance of lithium iron phosphate batteries is poor, the activity of the battery decreases at low temperatures, the embedding and shedding capacity of lithium decreases, and the usable capacity of the battery decreases. Taking a battery as an example, the capacity retention rate is 100% at 25 °C, the capacity retention rate is about 80% at 0 °C, and the capacity retention rate at -20 °C is only about 55%. Operating ambient temperature has a great impact on the usable capacity of energy storage batteries, in order to ensure the efficient use of energy storage systems, generally maintain the operating ambient temperature of electric energy storage equipment at about 15-25 ° C, in a low-temperature environment, generally through the battery compartment to take thermal insulation measures, the configuration of heaters and other measures to ensure the safe and efficient operation of energy storage equipment.In the desert and other areas, energy storage power station equipment is usually also facing the invasion of wind and sand, because the energy storage system generally adopts the outdoor integrated arrangement scheme of the cabin or cabinet type, the inlet and outlet of outdoor equipment such as battery compartment, energy storage converter transformer complete sets of equipment in a strong wind and sand environment, if the equipment protection level does not meet the requirements, fine sand and dust into the interior of the equipment may lead to a decline in electrical insulation performance, poor contact with switch equipment contacts, secondary equipment failure, and the accumulation of sand and dust will even cause serious failures such as electrical short circuits. Poses a threat to the safe operation of energy storage systems. Therefore, the overall protection design of outdoor equipment needs to fully consider the influencing factors of wind and sand, such as the use of measures such as sealing, the sealing agent at the connection, sand-proof cotton in the inlet and outlet, and reasonable setting of the wind direction of the air duct. At the same time, in the process of installation and maintenance, do a good job of dust-proof measures, reduce the frequency of opening doors and windows, and avoid sand and dust entering the inside of the equipment, especially non-walk-in energy storage equipment, it is necessary to consider the windproof sand measures for installation, commissioning and maintenance outside the cabin.Humidity, temperature, pollution, altitude, dust and other environmental conditions have a significant impact on whether the energy storage equipment can operate safely and reliably during the life cycle, especially the impact on safety should become the focus, energy storage equipment selection needs to understand the various natural conditions of the project location in advance and put forward design index values, such as altitude, annual extreme minimum temperature, sandstorm days, etc., consider various influencing factors in the production of equipment, and put forward guiding measures for the environmental adaptability of later operation and maintenance.Read More>>
What problems need to be solved when new energy storage "enters the market" in various places?
New energy storage is an important equipment foundation and key support technology for building a new power system and promoting the green and low-carbon transformation of energy, and is also important support for achieving the goal of "double carbon". In June this year, the National Development and Reform Commission and the National Energy Administration issued the Notice on Further Promoting the Participation of New Energy Storage in the Electricity Market and Dispatch and Application (hereinafter referred to as the Notice), which clarifies that new energy storage can participate in the electricity market as independent energy storage and deploys mechanisms such as market, price, and operation after its "entry into the market", aiming to promote the healthy development of the new energy storage industry.In less than a month, Guangxi took the lead in promoting the implementation of the Notice. The Development and Reform Commission of Guangxi Zhuang Autonomous Region recently issued the "Work Plan for Promoting the Participation of New Energy Storage in the Electricity Market and Dispatch and Application (Draft for Solicitation of Comments)" (hereinafter referred to as the "Work Plan"), which determines the six major tasks for promoting the use of new energy storage and proposes to complete the rules such as market access, planning, and construction grid-connected requirements, and the construction of dispatching and operation mechanisms before the end of this year, so as to create conditions for new energy storage to participate in the electricity market and dispatch and use.The reporter noted that as the first provincial-level plan in China, the "Work Plan" and the "Notice" have different expressions in "market access". The Notice clarifies that new energy storage projects that are encouraged to exist in the form of allocation and construction may choose to be converted into independent energy storage projects and participate in the electricity market as independent entities; The "Work Plan" requires that the energy storage and the power supply of the new energy allocation are jointly accessed, and the energy storage and the affiliated integrated projects in the multi-energy complementary integration are jointly accessed.One is the top-level "road map", and the other is the local "construction drawing", does the operation in Guangxi mean that the local government has a "steering deviation" in the process of landing the "Notice"? What problems need to be solved when new energy storage "enters the market" in various places?The top-level design refers to the stubborn disease, and the local plan is refined and landedEnergy storage has multiple values, but the development of the industry is facing an embarrassing situation of profitability, and a large number of enterprises that "lose money and make money" exist. "Based on the cost of the energy storage system of 1800 yuan / kWh in 2021, the energy storage power station is charged and discharged twice, and the average price difference between charge and discharge is more than 0.7 yuan / kWh, and it will take at least 10 years to recover the cost." Yu Zhenhua, executive vice president of the Zhongguancun Energy Storage Industry Technology Alliance, said frankly that at present, 22 provinces and regions across the country have issued policies to encourage or force new energy with energy storage, and the allocation ratio is between 5% and 20%. "However, under the pressure of new energy parity, the mandatory allocation of energy storage in a fixed proportion increases the fixed cost of new energy, and the cost lacks a way to recover.""Without power curtailment and regulation needs, the grid is difficult to dispatch." In the view of Zheng Hua, associate professor of the School of Electrical and Electronic Engineering of North China Electric Power University, the fundamental problem of new energy storage is that the uncertainty of cost and benefit and the existing mechanism have caused the investment environment to deteriorate, which in turn has led to the construction of energy storage facilities without problems.In order to solve the above problems, the National Development and Reform Commission and the National Energy Administration issued the Notice on June 7, which clarifies that the new energy storage can participate in the electricity market as independent energy storage, and if the independent energy storage power station transmits electricity to the power grid, its corresponding charging power does not bear the transmission and distribution price and government funds and surcharges. This move is regarded by the industry as an important policy to accelerate the marketization of new energy storage."Guangxi's Work Plan further clarifies whether user-side energy storage is independent, which is not specified in the Notice, that is, user-side energy storage can have an independent identity and participate in electricity market transactions." Zheng Hua said.Li Zhen, deputy secretary-general of the Zhongguancun Energy Storage Industry Technology Alliance, told reporters that the highlight of the "Work Plan" is to determine the specific tasks to promote the use of new energy storage, clarify the task leader, and promote the plan and time node. "This is a specific refinement of the top-level design, which has guiding significance for the application of new energy storage in Guangxi."The implementation level is difficult, and the operation of various places needs to be adapted to local conditionsWhat is the significance of directly participating in the electricity market and dispatching and operating as an independent entity?The reporter learned that the willingness to convert the new energy storage in the form of allocation to independent energy storage is relatively strong. "Independent energy storage can solve the problems of settlement difficulties and low utilization rate caused by the current stock of new energy storage without the identity of independent market entities." Chen Chao, marketing director of Xiamen Kehua Digital Energy Technology, said.However, as the first local document, Guangxi's "Work Plan" has some differences in expression: independent energy storage (grid side, user side) can be directly accessed, and the relevant policies for energy storage to participate in market-oriented transactions can be implemented. The energy storage of new energy distribution and the power supply projects of the new energy are jointly admitted, and the relevant policies of new energy participation in market-oriented transactions are implemented. Energy storage and affiliated integrated projects in the multi-energy complementary integration projects of wind, photovoltaic, water, and fire storage are jointly admitted. "This means that in the future, the integration projects in Guangxi and the energy storage in new energy power stations will not have the possibility of independent participation in the electricity market." Zheng Hua pointed out that the energy storage projects that can be converted into independent energy storage mainly involve non-independent new energy storage enterprises on the source side and the load side, such as new energy + energy storage, thermal power + energy storage, etc., but the implementation level is very difficult.Zheng Hua explained that the new energy storage in new energy and integration projects has actually clarified the scope of value and role at the filing stage, and has enjoyed the corresponding convenience and clarified the cost-benefit mechanism. "Due to the diversification of scenarios, the problems involved are not simple mode conversion, but 'changes' to the market operation and regulation operation system, involving land costs, transmission line fees, accident responsibility subjects, grid-connected performance rights and responsibilities, external regulation and operation mode, etc., and the complexity can be imagined." The joint access mechanism is appropriate and in line with current realities. ”"At present, it is impossible to simply evaluate which model is better, and independent energy storage or joint participation in the electricity market should be combined with specific analysis of the application environment." Simple conversion, if the access metering, improper connection of the market, will cause confusion. Li Zhen believes that the national top-level design is macro guidance, providing a variety of possibilities, specific to the local must be adapted to local conditions.Returning to the market is the only way Supporting measures need to be improved urgentlyThe cost of energy storage should eventually pass through the electricity market. "The participation of new energy storage in the electricity market is the only way, which is determined by the fundamental needs of the development of the new power system, and the Notice and work plan are only parts of a series of policies and a solid step in the right direction." Zheng Hua pointed out that in order to return the new energy storage to the market and use the "hand of the market" to solve the problems of unbalanced demand, mismatch between supply and demand, and unclear costs and returns, the government must establish an effective, fair, just and open market mechanism and system, and obtain prices through free trade."If there is no demand and application scenario, energy storage will become a sunken asset." Li Zhen said that the identity positioning of the new energy storage in the electricity market was not clear enough, mainly participating in the auxiliary service market such as peak shaving and frequency regulation, and the rules for participating in the access standards, transactions, settlements and other rules of the medium- and long-term trading and spot transactions markets were not clear. With the further liberalization of the policy, it is clear that the new energy storage can participate in the electricity market as an independent entity, and in the design of the system, it is necessary to fully consider the advantages of the new energy storage with high regulation performance and fast response speed, and give full play to its value in terms of energy and capacity; On the other hand, it is necessary to establish a scientific transportation mechanism and strengthen supervision to ensure that energy storage power stations invested by socialized capital are fairly dispatched, have equal rights and interests and considerable utilization rates.Industry experts remind us that the new energy storage is an important part of the new power system, but not all, it is necessary to coordinate the coordinated development relationship between the new energy storage and other power sources or market players, can not expand its value and role, but also can not be "deified", not to mention that there are still many problems to be solved."In addition, the participation of new energy storage in the electricity market is not only a matter of price mechanism, but also involves the access mechanism of the electric energy market, the power auxiliary service market, the electricity price mechanism, the trading mechanism, and the connection mechanism between different markets, as well as the influence of market players, the revenue model and other core issues, and there must be a set of new energy storage to meet the needs of China's new power system to participate in the relevant strategies, supporting measures and the construction of the connection mechanism of the electricity market." Zheng Hua pointed out that it is necessary to conduct in-depth research and gradually demonstrate the application, that is, it cannot be "one-size-fits-all", nor can it be delayed, and it is necessary to give full play to the ability to innovate.Read More>>
Green Tech supports you during nervous energy supply period
As the most popular and potential renewable energy source, solar energy is more recyclable and cost-effective, and most importantly, it is free for everyone.Under the recent tense international situation, the sharp drop in power generation in European countries has led to soaring electricity prices.The North American and Caribbean countries in the hurricane belt are affected to varying degrees at the same time. The supply of power companies is very unstable, and sometimes they have to have frequent power outages, which brings great inconvenience to people's daily life. While solar is much more pervasive than ever, it still accounts for a relatively small proportion of total electricity generation, and the vast majority of households and businesses still rely primarily on non-renewable energy sources such as oil and fuels, which are unstable and become more expensive.There are many solar energy markets worthy of our intensified efforts to promote solar graphene batteries, it is long life, maintenance-free, renewable, and more cost-effective when compared with lead-acid batteries which need to replace every 2 years. graphene battery is a hot trend and a better choice in the solar energy storage batteries market too, no more worry about the unstable power supply and frequent replacement.Green Tech has mature industry knowledge and experience to provide you with strong help and support to develop the market.Seize the opportunity now to meet the rigid demands of the market, we warmly welcome you to join us!Read More>>
What Are the Advantages of Solar Residential Energy Storage?
In the face of the current global energy crisis, electricity prices are soaring and the environment is seriously polluted. Is there any way to save on expensive electricity bills, keep your home's electricity stable, and enjoy a green lifestyle while protecting our environment? By pairing Graphene Supercapacitor Battery with solar panels, you can create a fully self-sufficient, 100% clean power system that can run indefinitely. The advantage of the solar residential energy storage system is that it can shave peaks and fill valleys. Store electricity during low-cost periods, use solar power during the day, and use stored energy in power stations during peak and high-price periods at night, saving a lot of electricity bills for your family.Top benefits of installing a solar energy storage system in your homeReduce or eliminate energy bills.Ensure power security during a grid outageKnow your electricity usage well.Help the environment and help us all.Bring Green Tech Power into your home, and enjoy Green & Free energy every day!Read More>>