Zhao Bo: Research Achievements and Energy Storage Development of Microgrid Projects

On June 3, 2015, the “Energy Storage International Summit 2015” co-sponsored by the National Energy Administration and the Zhongguancun Energy Storage Industry Technology Alliance (CNESA) and Düsseldorf Exhibition (Shanghai) Co., Ltd. was held in Beijing. At the "2015 Distributed Photovoltaic and Energy Storage System Forum and the Island Energy International Conference" parallel sub-forum, Mr. Zhao Bo, a senior engineer of the Electric Power Research Institute of Zhejiang Electric Power Company, made a report entitled "Micro-network project research results and energy storage." The keynote speech of Development, the following is the content of the speech.

Zhao Bo, senior engineer of Electric Power Research Institute of Zhejiang Electric Power Company:

Hello everyone, I am very happy to have this opportunity to have an exchange with you. Today I am reporting to you on some of the experiences related to energy storage in the microgrid project I have been doing in the past six years.

The future of energy storage development

In recent years, the price of energy storage products has plummeted. In 2007, the price of a 65 kW distributed photovoltaic system ranged from 56,000 yuan to 60,000 yuan per kilowatt, and the current price is less than 10,000 yuan. The price of lead-acid batteries, lithium batteries, and even flow batteries is decreasing. The cost of energy storage is gradually approaching the market. However, compared with the price of electricity, the price of energy storage is still an important factor restricting its development, and industrialized energy storage has not yet entered the practical stage. Centralized energy storage and independent energy storage in household enterprises are the future trends. In the future, distributed energy storage and large power grid coexistence and interdependence will be presented. Energy storage will be promising in the future development of power systems.

Overview of Microgrid Engineering Introduction

In the past three years, we have participated in three relatively large island microgrid projects. The population of the island is 300, 2,250 and 8,210 respectively, two of which are off-grid and one is grid-connected. Energy storage materials include mainstream storage of lead-acid batteries, lead-carbon battery supercapacitors, and lithium iron phosphate battery supercapacitors. The project has effectively increased the island's power supply capacity, reliability and utilization efficiency of renewable energy, and the renewable energy penetration rate is about 50%.

Next is the situation about the Lamma Island project. It adopts double busbar structure, secondary structure, IEC61850 standard, which increases reliability and realizes demand side management. The technical aspects have been improved, but the model needs to be further communicated and discussed with users. The energy management system used in Lamma Island, rolling optimization technology, is optimized for rolling every 15 minutes. Predict more accurately, control energy storage more effectively, increase the utilization of renewable energy, and reduce the amount of abandoned wind. The latest technologies such as voltage stability control and frequency stability control are the leading black start modes in the world. It can be seen from the daily power generation statistics of Lamma Island that the permeability from October 26th to 31st is very high, renewable energy is used throughout the day, wind and light storage, fire and diesel power are all stopped, but in When the wind and light energy are not good, the permeability will be lower.

Related technologies involved in microgrid engineering

The first is the optimal configuration of the microgrid project, which combines the permeability functions of wind, light resources and renewable energy to obtain data for the storage of energy storage. If the preparation is unreasonable, the operating cost of the entire microgrid will increase, and the subsequent evaluation will be poor. Due to the relatively high price of renewable energy power generation systems and energy storage systems, smaller solutions have advantages over the full life cycle and the price of existing energy and energy storage systems. Renewable energy control is relatively economical at around 50%. Many projects in China reach 70%-80%, and the economic cost will be high from the perspective of evaluation. Among the many projects, we only have two preparations for Dongfushan and Lamma Island. The success of Dongfushan is that it has not changed the energy storage system in four years. Only a few batteries have been replaced. The lead-acid battery is very strong, and at least one short-term charge and discharge should be done every day.

Followed by load energy storage technology. We analyzed the energy storage model and the existing actual equipment, and finally built a platform in the laboratory, with a variety of energy and power storage equipment. The 4 MWh energy-type energy storage system at Lamma Island and the 1 MW 15-second power storage system work together, and the results are not satisfactory. This involves technical and hardware problems, and the device delay smoothing effect is not ideal. The use of supercapacitors to increase the life of energy storage has now increased by 6.6% in theory. Some experts believe that the lithium battery itself can also act as a super capacitor when it is shallow and shallow, which I agree with.

Third, the need for operational control. The impact of energy storage system operation control on the entire energy storage life is very huge, and China has overcome the core technical difficulties. The control logic of the grid-connected microgrid and the independent microgrid is different, and the corresponding management system is made according to different needs. At present, there is no real microgrid management system in China, and most of them are traditional substation automation, just an energy management system, and there is no substantive strategy.

In terms of engineering, the battery stack must be consistent with the internal group when it leaves the factory. The modularization of many battery manufacturers is still not mature, and the BMS system integration is still using manual wiring. The accuracy of domestic production is very poor, and the price of foreign countries is relatively expensive. Lithium batteries have high requirements for temperature control, explosion protection and fire protection. If they are used in island applications, anti-corrosion problems should also be considered. In terms of energy conversion systems, each manufacturer in the country is different, and there is no uniform standard in technology and testing. Therefore, in many microgrid projects, the workload of integrated debugging will be quite large. There is no good solution to the consistency of running at the same time, involving more and more problems. I will not tell you about the time relationship here.
My report is here, thank you.

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