Source | Sobi PV Grid
As we all know, with the diversification of the main body of the new power system, the complexity of the power grid form, and the diversification of the operation mode are becoming more and more obvious, the explosive growth of new energy has led to problems such as large voltage fluctuations on the power generation side, reduced reliability of power supply, and difficulty in peak regulation.
As the basic unit of the energy system based on the comprehensive utilization of distributed energy resources, the microgrid can realize the load regulation within the region, help the terminal consumption of distributed new energy, and serve as an effective supplement to the power backbone network to enhance the resilience of the power grid.
Compared with the traditional large power grid, the microgrid energy utilization form is many, and the development of various new energy technologies and energy storage technologies makes the microgrid an independent subject, with a high degree of integration of source, load and storage, and strong power supply reliability.
With more than 30 years of experience, Huawei Digital Power has taken the lead in integrating digital technologies with innovations in photovoltaics, energy storage, charging, and thermal management, setting a precedent for all-scenario, cost-effective, reliable, secure, and friendly intelligent microgrid solutions. In order to help the green and low-carbon transformation of new power systems, urban energy systems, park energy systems, household energy systems, and transportation energy systems, and provide users with diversified green energy supply and energy experience.
In terms of reliability, Huawei's intelligent microgrid supports stable operation in both grid-connected and off-grid states, providing stable and reliable power supply for scenarios with poor or weak mains power such as new cities, mines, oil fields, islands, remote cities, and large-scale industrial and commercial vehicles, as well as disaster backup power solutions for areas with stable power grids.
Huawei uses three stability reconstruction technologies, including voltage stabilization, frequency stabilization, and power angle stabilization, to support GW-level grid forming network construction capabilities. In weak power grid scenarios, it supports GW-level online grid-connected PQ and off-grid VSG automatic switching, and supports seamless on-grid and off-grid switching to ensure the smooth operation of the system.
With the support of the three major reconstruction technologies, Huawei's intelligent microgrid solution consists of an intelligent photovoltaic system and an intelligent string energy storage system, which works with the existing distribution network to provide stable and reliable green energy for loads. It consists of a smart PV inverter, an intelligent string energy storage system, an intelligent energy storage controller, an intelligent box transformer, a SmartACU intelligent subarray controller, and third-party components, EMS/microgrid controllers and power distribution networks.
In addition, Huawei's intelligent microgrid uses multi-machine and multi-subarray parallel slow-start synchronous step-up technology, which allows the energy storage system to slowly ramp up the voltage of all transmission and distribution lines, transformers, and loads from scratch when all transmission and distribution lines, transformers, and loads are closed, and the entire network voltage can be established in minutes, greatly reducing the black-start time. Compared with the traditional optical storage sub-array-level black start, Huawei supports early recovery of the microgrid system, greatly improving system revenue.
Even in extreme situations, Huawei's intelligent microgrid has a rapid response plan: using technologies such as whole-step power support and out-of-step resynchronization, the microgrid system can re-establish the voltage and restore the voltage within hundreds of microseconds. Under the 100% new energy grid, it supports continuous high and low voltage off-grid continuous fault ride-through of 0 ~ 1.3Un to ensure stable and continuous operation.
In terms of economy, Huawei's solution can increase the PV-to-energy ratio by up to 200% and reduce the LCOE by more than 30%. We know that the presence of a high proportion of renewable energy in the microgrid system is a very weak power grid. The energy storage PCS runs in the grid construction mode, and the photovoltaic inverter works in the current source mode. When the ratio of photovoltaic energy storage is greater than 2:1 and the photovoltaic power is generated at full power, 50% of the photovoltaic power can be directly supplied to the load, and the remaining 50% of the photovoltaic power can be used for energy storage and charging. At this time, the rated power of the current source equipment in the microgrid is 3 times the power of the PCS, which is in an extremely weak power grid, which brings challenges to the steady-state operation of the microgrid.
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However, in the existing microgrid system in the mainland, photovoltaic and energy storage are mostly patchwork, supplied by different manufacturers, and the synergy between photovoltaic and energy storage is weak, and the industry's photo-storage ratio is less than 1:1, that is, the current 1MW photovoltaic must be equipped with more than 1MW PCS network, which has high requirements for customer energy storage configuration.
Huawei's intelligent microgrid solution supports stable operation of off-grid with a high 2:1 PV storage ratio, which means that the rated power of the PV system can be twice the rated power of the energy storage system. Compared with traditional optical storage microgrids, which only support a 1:1 optical storage power ratio, this feature can reduce the total investment of optical storage microgrid systems, reduce the system LCOE, and improve the rate of return.
Importantly, Huawei's microgrid solutions have been proven in many projects.
In the middle of the endless desert, build a new city of 28,000 square kilometers, in which one million people come and live, without large grid access, relying only on photovoltaic power generation for power.
This is not science fiction, this is Saudi Arabia's "Red Sea New City". The project is located in the west of Saudi Arabia and is a key project in Saudi Arabia's "Vision 2030", and the biggest highlight of urban construction is that all power supply comes from new energy.
In such a "city of the future", what is more challenging than using new energy as a power source is its energy storage and microgrid power supply methods.
In the face of the times, Huawei used Saudi Arabia's 400MW photovoltaic power in the Red Sea and a 1.3GWh microgrid energy storage system to provide answers through intelligent optical storage solutions.
In order to ensure that there are no deviations in practice, Huawei has built the world's first and largest 8.8 MW optical storage and off-grid laboratory, which has passed rigorous testing in three stages: all-digital simulation, hardware-in-the-loop simulation, and 8.8 MW prototype laboratory, and fully verified the products before they are shipped. In addition, Huawei has dispatched a team of experts to the Red Sea site in Saudi Arabia to solve various intractable problems encountered on the site as soon as possible.
Huawei's "Red Sea New Town" will not be an isolated case. According to the recent report "Grid and Energy Transition for Secure Grids" published by the International Energy Agency, 80 million kilometers of power grids will need to be added or replaced by 2040 to meet all national climate goals and ensure energy security.
With the increasing scale of global renewable energy grid integration, it is increasingly important to improve the support capacity of the power grid. In addition to replacing the power grid, microgrids are also a good option.
Huawei adheres to the concept of "three convergences", namely the integration of digital technology and power electronics technology, the integration of photovoltaic and energy storage, and the integration of energy flow and information flow, to create an intelligent microgrid solution, which uses its advanced digital and intelligent systems to achieve efficient energy management and provide a second choice for energy supply in remote and weak power grid areas.
—ENDS—