Rural Distribution Area Energy Storage Renovation Project for PV Consumption and Voltage Stabilization in Pizhou, Xuzhou, Jiangsu
2026-06-09
Project Location: Rural centralized residential distribution areas, Pizhou City, Xuzhou City, Jiangsu Province
Commissioning Time: April 2026
Equipment Configuration: 200kWh/100kW integrated outdoor distribution area energy storage system
1. Project Background
Rural areas in Pizhou feature a high penetration rate of household distributed photovoltaics. Large-scale local grid connection of PV systems causes a typical day-night load mismatch in distribution areas. During midday, high PV generation coincides with low residential power consumption, resulting in surplus reverse power transmission, grid overvoltage, voltage limit violation and severe PV curtailment. In the evening, concentrated power consumption for cooking, lighting and air conditioning leads to sharp load surge, transformer overload and terminal undervoltage.
Traditional renovation methods, such as transformer capacity expansion and line reconstruction, are characterized by long construction cycles, high investment costs and widespread power outages. Moreover, they cannot realize flexible dynamic regulation adapting to real-time changes of PV output and user load, resulting in limited governance effect.
2. Renovation Solution
This project adopts a local governance scheme based on distributed distribution area energy storage. Integrated outdoor energy storage systems are deployed in problematic distribution areas without transformer replacement or large-scale line renovation. The system applies an intelligent time-sequence operation strategy: it automatically charges during peak PV generation at noon to absorb surplus photovoltaic power and suppress voltage rise, and discharges during evening power consumption peaks to compensate power shortage and reduce transformer load pressure.
The equipment integrates active voltage stabilization, reactive power compensation, three-phase unbalance governance and harmonic suppression functions to dynamically correct various power quality defects in real time. It also supports islanding operation under grid fault conditions, providing emergency power supply for critical loads during power outages.
3. Project Achievements
The project effectively solves the dual power quality problems of daytime overvoltage and nighttime undervoltage in rural distribution areas, raising the grid voltage qualification rate to over 99.7%. The local consumption rate of distributed photovoltaic power is increased by more than 20%, which significantly reduces PV curtailment. The peak load rate of distribution transformers is reduced by 30%, completely eliminating seasonal overload tripping risks.
Realizing flexible capacity expansion with zero civil engineering and zero transformer replacement, the project cuts renovation investment by 40%. It greatly improves the emergency power guarantee capability of rural power grids and serves as a typical demonstration project for integrated PV and energy storage governance in rural distribution networks in northern Jiangsu.