How To Match PV With Energy Storage

With the rapid development of renewable energy, photovoltaic power generation has become an important part of the global energy transformation. However, the intermittent and instability of photovoltaic power generation has brought challenges to the stable operation of the power grid. As an effective means to solve this problem, energy storage technology is crucial to its matching relationship with photovoltaic power generation.

This article will discuss in detail the matching method of photovoltaic and energy storage, the relationship between photovoltaic energy storage and photovoltaic capacity, and how to optimize this relationship to improve the economy and reliability of photovoltaic power generation systems.

1.1 Types of energy storage technology

Energy storage technologies mainly include chemical energy storage (such as lithium-ion batteries, lead-acid batteries, etc.), physical energy storage (such as pumped storage, compressed air energy storage, etc.) and electromagnetic energy storage (such as supercapacitors, superconducting magnetic energy storage, etc.). Different types of energy storage technologies have different energy density, power density, cost, life and other characteristics, and are suitable for different application scenarios.

1.2 Matching principles

The matching of photovoltaic power generation and energy storage needs to consider the following principles:

(1) System stability: The energy storage system should be able to smooth the output fluctuations of photovoltaic power generation and improve the stability of the system.

(2) Economic efficiency: The cost of the energy storage system should match the economic efficiency of the photovoltaic power generation system to achieve the optimal return on investment of the overall system.

(3) Reliability: The energy storage system should have high reliability to ensure the stable operation of the photovoltaic power generation system.

(4) Environmental adaptability: The energy storage system should be able to adapt to different climatic conditions and geographical environments.

2.1 Determination of energy storage capacity

The determination of energy storage capacity needs to consider the following factors:

(1) The scale of photovoltaic power generation system: The larger the photovoltaic capacity, the larger the required energy storage capacity.

(2) System load demand: According to the system load demand, determine the capacity of the energy storage system to meet the peak demand of the load.

(3) Discharge time of the energy storage system: According to the system's requirements for the discharge time of the energy storage system, determine the capacity of the energy storage system.

(4) Economic efficiency: Under the premise of meeting the stability and reliability of the system, consider the cost of the energy storage system and reasonably determine the energy storage capacity.

2.2 The ratio of energy storage capacity to photovoltaic capacity

The ratio of energy storage capacity to photovoltaic capacity (energy storage ratio) is a key factor affecting the economy and reliability of the system. If the energy storage ratio is too high, the investment cost of the system will increase; if the energy storage ratio is too low, the energy storage system cannot fully play its role. Therefore, it is necessary to reasonably determine the energy storage ratio according to the actual situation.

3.1 Optimization design

During the design stage of photovoltaic power generation system, the demand of energy storage system should be fully considered, the type of energy storage technology should be reasonably selected, and the configuration of energy storage system should be optimized.

3.2 Intelligent control

Through intelligent control technology, the coordinated operation of photovoltaic power generation system and energy storage system can be realized to improve the stability and economy of the system.

3.3 Policy support

The government should introduce relevant policies to encourage the research and development and application of photovoltaic energy storage technology, reduce the cost of energy storage system, and improve the competitiveness of photovoltaic power generation system.

4. Conclusion

The matching relationship between photovoltaic and energy storage has an important impact on the economy and reliability of photovoltaic power generation system. By reasonably selecting the type of energy storage technology, determining the energy storage capacity, optimizing the energy storage ratio and other measures, the overall performance of photovoltaic power generation system can be improved.