Amid the intelligent upgrading of smart grid transformer stations, concentrators serve as core terminals for data collection and transmission, undertaking key tasks including high-frequency multi-node data acquisition, automatic station topology identification and rapid fault location. Their performance directly determines grid operation and maintenance efficiency and data accuracy, which sets stringent requirements on memory capacity and data processing capability of supporting HPLC chips.
As a mainstream chip for state grid concentrator local communication modules, Hisilicon Hi3931 is widely adopted in various station upgrade projects thanks to reliable communication performance. However, its insufficient built-in memory has become a major bottleneck restricting compliant implementation and performance improvement of projects. Our 64Mbit QSPI PSRAM features perfect compatibility and superior core performance, serving as the optimal matching memory solution for Hisilicon Hi3931, effectively solving industry pain points and facilitating efficient and compliant project delivery. The latest mandatory national grid standards such as Q/GDW 1374.2-2025 Technical Specification for Power User Electricity Information Acquisition System clearly stipulate that HPLC routing acquisition modules must be equipped with large-capacity operating cache to support core functions including minute-level data collection and station topology identification.
A provincial state grid power company launched a full-provincial intelligent transformer station upgrading project covering over 500 stations. The core requirements include minute-level data collection from more than 100 smart meters via concentrators, automatic station topology identification and fast fault positioning, in full compliance with national grid specifications. The project prioritized Hisilicon Hi3931 HPLC chip as the core of concentrator local communication modules. Nevertheless, the limited on-chip SRAM failed to meet the mandatory large-capacity cache requirements specified in national grid standards, resulting in prominent bottlenecks in topology data storage and processing. After repeated comparison and selection, our 64Mbit QSPI PSRAM was finalized as the supporting memory solution to ensure full compliance and satisfactory performance.
As the preferred matching memory for Hisilicon Hi3931, our 64Mbit (8MB) PSRAM perfectly compensates its memory shortage while ensuring easy selection and stable operation. The built-in 4MB memory of Hi3931 only supports basic communication protocols, and cannot accommodate massive node data, path planning algorithms and message cache required for station topology identification, easily causing topology identification lag and data packet loss which hinder project progress and compliance acceptance.
Adopting QSPI interface, our PSRAM achieves pin-to-pin seamless connection with Hisilicon Hi3931, requiring no PCB modification or driver debugging, which greatly cuts integration costs and shortens project cycle. It supports up to 84MHz high bandwidth with read/write latency below 20ns, capable of real-time caching of hundreds of power messages and complete station topology tables, providing sufficient support for efficient operation of topology identification algorithms and eliminating system lag and packet loss issues.
Practical project results fully verify the rationality and superiority of our PSRAM matched with Hisilicon Hi3931. After large-scale deployment across more than 500 transformer stations in the province, remarkable results have been achieved. The concentrator realizes stable topology identification and completely eliminates various operational failures caused by insufficient memory. Data collection efficiency is greatly improved, fully meeting the national grid minute-level collection standard.
In addition, our PSRAM is manufactured in line with industrial-grade standards with an operating temperature range of -40℃ to +85℃, adapting to harsh outdoor station environments and ensuring long-term stable operation without memory-related faults. Fully compliant with Q/GDW 1374.2-2025 national grid standards, it has won high recognition from the provincial power company and project partners. It has become the top choice of supporting memory for Hisilicon Hi3931 and provided replicable reference for subsequent provincial and national transformer station upgrading projects.
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