Common Problems with Industrial and Commercial Energy Storage Systems (Part 2)

The domestic industrial and commercial energy storage market is developing rapidly. While the market size is advancing rapidly, it is necessary to understand the energy storage system and the design and construction process to ensure the rationality, economy, and safety of energy storage project construction. This article summarizes common issues in the design and construction of industrial and commercial energy storage systems for reference.

Q: What are the site requirements for installing energy storage power stations?

The venue is located outdoors, preferably away from office spaces and dense crowds, and there are no hazardous chemical warehouses within 20 meters. A place close to the access point distribution room (recommended within 100m) and convenient for cable layout. Consider a hardened site that is convenient for transportation, lifting, and load-bearing. In actual projects, safety protection passages and isolation passages need to be reserved according to the requirements of the local fire department. Taking the example of the Guruiwatt ENSE energy storage integrated cabinet, the single cabinet occupies an area of ≤ 1.7 square meters, and the 1MWh energy storage system occupies an area of about 8.5 square meters. Considering the reserved fire escape and maintenance distance, the overall occupied area is about 27 square meters.

Q: What procedures are required to install an energy storage power station?

The installation of energy storage power stations requires project registration on the local Development and Reform Bureau website and power company approval for power access. In addition, depending on the requirements of different regions, it may involve other review procedures such as fire protection design review, environmental impact assessment report, and case evaluation report. Therefore, it is necessary to understand the local requirements for industrial and commercial energy storage acceptance approval and prepare for the project budget in the early stage; The above procedures are the responsibility of the integrated operator, and the owner can cooperate to provide the necessary information.

Q: What are the construction processes for summarizing energy storage power stations? How long does the construction period take?

The construction process of industrial and commercial energy storage power stations includes preliminary capital collection survey, scheme design, project filing, drawing design, access approval, construction, equipment commissioning, and completion acceptance. The overall construction period is determined by the time required for different project processes, and the construction period is about 1-1.5 months; When connecting to the grid, a short power outage is required. Depending on the construction plan of different projects, in order to minimize the impact on the production of electricity consuming enterprises, the shortest power outage construction time is generally about 2 hours.

Q: Does energy storage power station have an impact on the basic electricity bill of enterprises?

The basic electricity pricing methods for electricity consuming enterprises are mainly based on capacity billing and demand billing. If charged by capacity, the basic electricity fee is fixed, and adding energy storage systems will not affect the basic electricity fee under the condition of not exceeding the total transformer capacity of the enterprise; If billing is based on demand, it is possible that the energy storage discharge has taken on the load, reducing the maximum demand and thus lowering the basic electricity bill. During the period of increasing load through energy storage charging, the total demand is generally controlled within the maximum demand as much as possible when designing the energy storage capacity. If there is an increase in demand, the energy management system can be used to control the overall output of the energy storage, or the excess part can be deducted from the revenue according to the loss cost.

Q: Does the presence of some inductive/capacitive loads in the factory area affect the operation of energy storage?

The energy storage system is a grid connected system that is not independently loaded. When the energy storage is discharged, it is connected to the power distribution system in the factory area through AC coupling. The energy storage system does not directly drive the equipment to start. If there is an inductive/capacitive load, the grid also exists in the system to provide support during startup and will not have a direct impact on the energy storage system.

Q: Will the construction of new energy storage facilities affect the revenue settlement between a company that already has a third-party photovoltaic power station?

Whether the construction of a new industrial and commercial energy storage system will have an impact on the original photovoltaic revenue depends on the consumption situation of the original photovoltaics. For example, if a company consumes electricity during the day and there is basically no remaining load of photovoltaics after consuming them, the construction of new energy storage as a supplementary part of the company's electricity consumption will not have a direct impact on photovoltaics; If a company consumes electricity during the day and there is still a significant amount of surplus electricity from the photovoltaic system after it has been absorbed, the company no longer has any additional electricity demand, and there is no additional consumption space for the newly added energy storage system; If a company has less surplus electricity after consuming photovoltaic power during the day and it is concentrated in the noon period, the addition of an energy storage system may have the possibility of consuming photovoltaic power. At this time, it is necessary to consider the specific situation of the project and the benefits comprehensively. If necessary, it is necessary to negotiate among the electricity company, photovoltaic property rights holder, and energy storage construction party.

Q: Will energy storage power stations generate losses?

In addition to battery charging and discharging, the energy storage system also requires external power supply for internal fire monitoring, air conditioning, temperature control systems, etc. There are some losses that need to be taken into account and deducted when calculating revenue sharing.

Q: What are the main contents of operation and maintenance of energy storage power stations?

Industrial and commercial energy storage power stations are unmanned power stations that require regular maintenance and inspection. For air-cooled energy storage integrated cabinets, the general maintenance and inspection contents include:

For the liquid cooled energy storage integrated cabinet, it is necessary to regularly check the status of the coolant, replace the coolant regularly, and check whether the liquid cooling device joints are normal.

summary

Industrial and commercial energy storage is one of the most important application scenarios on the user side. Industrial and commercial energy storage projects have large differences in demand, complex application environments, and diversified profit paths; At the same time, due to the fact that the installation, debugging, and operation of industrial and commercial projects need to be carried out within the enterprise park, the project has a high degree of professionalism, so it is necessary to design reasonably based on the actual project situation during construction.