In the hottest spot market, the market will find t

In the spot market, the market will find the value of peak shaving and frequency modulation of energy storage power stations and price them

at present, power companies use expedient measures to invest in energy storage power stations. For example, the Zhenjiang energy storage power station invested by Jiangsu electric power company is invested and operated by the Energy Service Co., Ltd. subordinate to Jiangsu electric power company to provide services for Jiangsu electric power company, and then the rent is paid by Jiangsu electric power company. According to people familiar with the matter, the rent paid by Jiangsu electric power company comes from the reward and punishment funds for auxiliary services of thermal power plants and the funds for building a "source load" system. In addition, the energy storage power station can also obtain part of its income through the peak valley price difference. This mode has become a common mode of power side energy storage projects and is one of the expedients to make up for the economy of energy storage power stations. Because the energy storage power station has to undertake peak load regulation, frequency regulation and other auxiliary service functions, it will not generate electricity for a considerable period of time. It is difficult to solve the investment return problem of the energy storage power station only by relying on the fixed electricity price of the traditional thermal power plant. The solution in this regard is the marketization of electricity. In the spot electricity market, the market will find the value of peak shaving and frequency modulation of energy storage power stations and price them. However, China's power market is in the process of construction. At present, the electricity price is still set by the government. With the development and improvement of the power market, this problem will be solved

in the past year, the application field of energy storage in China has expanded to the electric side. Electric side energy storage was the largest newly added application field in China's energy storage market last year

energy storage is divided into mechanical energy storage, electrical energy storage, electrochemical energy storage, thermal energy storage and chemical energy storage

due to the fast and flexible characteristics of electrochemical energy storage, it is increasingly valuable in modern power system power generation, transmission, distribution, power consumption and other links. The electric side energy storage referred to in this paper refers to the electrochemical energy storage projects applied in the transmission and distribution side. In reality, they are generally invested and operated by electricity or its subordinate companies, and are mostly applied in the distribution side

2018 is the first year of the development of electric side energy storage in China, with a rapid growth in scale. Public information shows that as of the first three quarters of last year, the scale of power side energy storage projects has reached 150MW, of which 140MW has been newly installed. In addition, the planned and under construction power side energy storage projects reach 465mw. For comparison, the global electric side energy storage project is only 756.5mw, of which the new scale is 301mw, which means that the scale of new electric side energy storage projects in the Chinese market is close to half of the global new scale

with the explosive growth of China's power side energy storage market, benefiting from the growth of indirect power sources such as wind and light, China power is facing an increasingly fluctuating peak valley load difference. China Power Corporation began to pay attention to the value of energy storage in peak shaving, frequency modulation and other power auxiliary services

at present, the electric side energy storage is still in the stage of test and demonstration, and electric companies are more studying and confirming the application effect and Prospect of energy storage on the electric side. Due to the huge volume of China Power Corporation, the demonstration alone has made the new scale of China's power side energy storage reach an unprecedented level

however, since China's power market has not been fully established, the value of auxiliary services of energy storage in the power system cannot be quantitatively evaluated, and it is freely traded in the market. At present, there is no mature business model for electric side energy storage. In the demonstration stage, the expedient investment of power companies can still be adopted. If it wants to develop on a large scale in the future, the business model must be solved

China's electricity side energy storage market opened

last December, caozhian, general manager of Nanfang power, presided over a discussion on energy storage work. The meeting made it clear that Nanfang would lay out demonstration projects for energy storage in new energy consumption, island independent power supply, power distribution side application and other aspects, and decided to study and formulate guidelines for the development of energy storage

this is the first power company to plan the development strategy of electric side energy storage at the head office level after the state household appliances encouraged its subordinate provincial-level power companies to pilot the electric side energy storage project. This also means that after China has carried out a number of electricity side energy storage demonstrations, South China will follow suit and start a new round of electricity side energy storage projects in the south

before 2018, energy storage has been widely used on the power generation side and the power consumption side. In 2018, the power side energy storage projects developed rapidly, almost from scratch, and became the first category of application scenarios for energy storage

the first electric side energy storage demonstration project in 2018 came from Henan electric power company. The project adopts a distributed mode to build energy storage demonstration power stations in 16 substations distributed in 9 prefecture level cities of Henan electric power company, with a total of 100MW. The project is a supporting project of the 2017 national power headquarters' scientific research topic "research and application demonstration of the aggregation effect of multi-point distributed energy storage system in electricity"

following Henan is the demonstration project of Zhenjiang energy storage power station invested and constructed by Jiangsu electric power company. The promotion of the project stems from the summer peak power demand in the eastern part of Zhenjiang. After the decommissioning of Jianbi coal-fired power plant in Zhenjiang, the gas-fired power plant originally planned to replace Jianbi Power Plant could not be put into operation on schedule. In view of this, Jiangsu electric power company decided to build energy storage power stations to meet the demand

unlike Henan energy storage power stations, which are distributed in many prefecture level cities, Zhenjiang project is concentrated in the eastern part of Zhenjiang City, divided into eight energy storage power stations, with a total of 101mw, which also makes Zhenjiang project the largest power side energy storage project in the world

Huang Junhui, director of the planning and development research center of Jiangsu Economic Research Institute, revealed that long before the planning of energy storage projects, considering the increasing scale of external electricity in the province, in order to improve the safety of Jiangsu power operation under this external condition, Jiangsu electric power company has developed a "source load friendly interactive system". If the external call supply fluctuates, it can link the power supply, electricity and users to respond in time to ensure the safe operation of electricity

after the energy storage power station is put into operation, the "source load" system is upgraded to the "source load storage" system. In addition to meeting the power demand, the energy storage can also play its charge and discharge flexibility to meet the needs of the safe operation of Jiangsu power system

after the Zhenjiang project, Jiangsu electric power company was out of control in terms of relevant standards for the construction of Jiangjiang security infrastructure. On October 25 last year, Jiangsu Province began bidding for the second batch of electric side energy storage power station projects, with a total scale of 201.6mw, distributed in Suzhou, Nanjing and Kunshan

besides Jiangsu, there are also electric side energy storage power station projects with more than 50MW put into operation in Hunan, Gansu and other provinces. It is the domestic intensive promotion of energy storage power station demonstration projects that finally formed the blowout of the domestic electric side energy storage market in 2018

the rise of power side energy storage projects is related to the changes in the power side in recent years. In the past, thermal power generating units on the power side were the absolute main force. The output of these power sources was controllable, and the internal load fluctuation mainly came from the power consumption side

with the transformation of the country's coal based energy system to clean energy. Intermittent power supplies such as wind power and Optoelectronics gradually occupy the main part of the new power supply, and enjoy a priority scheduling position in power dispatching. The fluctuation of the power generation side is increasing, which brings difficulties to the scheduling

the stored energy can be charged and discharged. It can be discharged at the peak and charged at the trough, which can effectively stabilize the peak and valley fluctuations in electricity. In addition, the response time of energy storage can reach the second level, and the switching of charge and discharge can be carried out within one second. As a comparison, the response speed of coal-fired power stations is within one minute, and the response speed of energy storage is one order of magnitude higher than that of coal-fired power stations

because of this technical characteristic of energy storage, energy storage has developed on a large scale in the fields of new energy consumption demonstration and thermal power frequency modulation before the electric side energy storage. It is precisely because the technical characteristics of energy storage are reflected in more and more demonstration projects that power companies begin to pay more attention to the application of energy storage on the power side

at present, relevant institutions have not yet had the data on the operation of power side energy storage power stations in 2018. However, according to the situation in the first three quarters, it is expected that the scale of domestic electric side energy storage power stations will reach 350MW throughout the year

nevertheless, the electric side energy storage is still in its infancy in China. Within the national power grid, just as the Henan project is to undertake the scientific research project of large oil output from the oil return pipe of the national headquarters, the electric side energy storage project is still in the stage of demonstration and scientific research

according to insiders close to Guodian, the attitude of Guodian towards electric side energy storage is to encourage demonstration, but it requires cautious pace and rapid development. This person believes that the power safety issue is big, and he understands the cautious attitude of the power company. Therefore, after the power side energy storage demonstration project is intensively put into operation this year, the power company needs at least years to study and summarize, so as to lay the foundation for the next step of energy storage into power planning. "We don't expect too many electric side energy storage projects in the next two years. The scale will certainly not exceed this year, and the large-scale growth should be in."

business model problems to be solved

at present, power companies have adopted expedient measures to invest in energy storage power stations. For example, the Zhenjiang energy storage power station invested by Jiangsu electric power company is invested and operated by the Energy Service Co., Ltd. subordinate to Jiangsu electric power company to provide services for Jiangsu electric power company, and then the rent is paid by Jiangsu electric power company

according to people familiar with the matter, the rent paid by Jiangsu electric power company comes from the reward and punishment funds for auxiliary services of thermal power plants and the funds for building a "source load" system. In addition, the energy storage power station can also obtain part of its income through the peak valley price difference

this mode has become a common mode of power side energy storage projects and is one of the expedients to make up for the economy of energy storage power stations

because the energy storage power station has to undertake peak load regulation, frequency regulation and other auxiliary service functions, it will not generate electricity for a considerable period of time. It is difficult to solve the investment return problem of the energy storage power station only by relying on the fixed electricity price of the traditional thermal power plant

the solution in this regard is power marketization. In the power spot market, the market will find the value of frequency modulation and frequency modulation of energy storage power stations and price them. However, China's power market is in the process of construction. At present, the electricity price is still set by the government. With the development and improvement of the power market, this problem will be solved

at the current stage, the business model of energy storage power stations, one of which can refer to pumped storage power stations, set a two-part electricity price, which reflects both the power value of energy storage power stations and their capacity value. However, this requires the corresponding electricity price policy of the national development and Reform Commission

it is generally believed in the industry that the most practical and feasible way at present is to take the electric side energy storage power station as the "component" of electricity to give full play to the auxiliary functions required by the power station. But this model can work, it needs the consent of the energy administration

at present, China's power system is in the process of reform. Electricity earns income from the price difference between the electricity price and the sales price, and will change to the mode of verifying the transmission and distribution price, in which electricity only undertakes the transmission function and charges according to the size of electricity

the premise for power companies to invest in power side energy storage power stations on a large scale is that the national energy administration will include the energy storage power stations into the allowable cost of the transmission and distribution electricity price of the approved power companies. At present, the transmission and distribution tariffs of provincial power companies have been fully approved, and the adjustment period is three years. This means that, as a new thing, the electric side energy storage power station needs to be accepted by the energy administration, and the transmission and distribution price should be modified accordingly

another idea was put forward in a report of the south, that is, at this stage, power companies can provide capacity subsidies to promote the development of power side energy storage power stations

industry insiders believe that compared with the former, this idea is more conducive for third-party investors to enter the power side energy storage market, improve efficiency and reduce costs, but it also involves a problem, capacity subsidies