Challenge 1: Harmonic disturbance caused by multiple distributed energy sources, risking unstable operation of ESS and chargers
Multiple power‑electronic devices including PV inverters, small wind converters and EV chargers share the same 0.4 kV low‑voltage busbar. Frequent start‑stop of DC chargers amplifies harmonic distortion. Excessive harmonics may trigger unexpected protection trips of the energy storage PCS, resulting in intermittent charge‑discharge cycles and abnormal wind‑turbine inverter performance. Under such conditions, surplus PV power cannot be reliably stored.
Solution: The MECC 125 kW/261 kWh liquid‑cooled cabinet is embedded with active harmonic mitigation functions. Its PCS conducts high‑frequency real‑time sampling of bus voltage and current to dynamically compensate grid harmonics. From the system layout perspective, the energy storage cabinet is connected to the main 0.4 kV busbar rather than the branch circuit of charging piles, avoiding harmonic interference from EV charging equipment. The energy management system continuously monitors power‑quality indicators. Once harmonic values approach warning thresholds, it automatically adjusts ESS charge‑discharge power to suppress disturbances, enabling long‑term parallel stable operation of PV, wind turbine, energy storage and chargers without unplanned shutdowns.
Challenge 2: Heterogeneous devices with inconsistent communication protocols block coordinated dispatch
Existing PV inverters, wind turbine controllers and EV chargers are sourced from different manufacturers with mismatched communication protocols. Without a unified scheduling brain, surplus PV generation cannot be accurately identified. Energy storage cannot start charging immediately upon PV power surplus, leading to wasted renewable energy fed to grid, and delayed ESS discharging during peak consumption periods. Expected self‑consumption targets are hard to achieve.
Solution: The MECC energy management platform is equipped with multi‑protocol adaptive gateways, which are compatible with mainstream communication protocols of on‑site third‑party PV inverters, wind controllers and charging piles. Full‑link data communication is established among all hardware units. The platform collects real‑time data including PV output, wind generation, building load, charger power and ESS SOC. Global coordinated dispatch is realized instead of isolated device operation. The system detects PV power surplus at millisecond level and sends instant charge/discharge commands to energy storage cabinets, removing barriers for coordinated control among heterogeneous distributed energy assets.
Project Operation Strategy
Renewable energy consumption is set as top priority. During PV peak generation, when solar output exceeds total on‑site load demand, surplus photovoltaic power is stored in the MECC 125 kW/261 kWh liquid‑cooled cabinet to maximize PV self‑consumption rate. When PV output drops or night‑time peak load occurs, stored green electricity is discharged to supply building loads and EV chargers, reducing utility grid power purchase. Wind power surplus is also integrated into ESS scheduling logic.
Project Value & Impact
1.Boost renewable self‑consumption and cut electricity expenditure
The project addresses low PV on‑site consumption pain points and improves overall renewable energy utilization. Higher self‑consumption ratio reduces grid electricity purchase and brings tangible cost savings. The energy storage system retains expansion potential for future grid demand‑response and power‑trading revenue streams.
2.Support low‑carbon development and policy compliance
The solution aligns with national carbon‑peaking and carbon‑neutrality strategies and relevant green‑energy policies, creating eligibility for corresponding policy incentives.
3.Build replicable micro‑grid demonstration reference
As a physical testbed for the micro‑grid research institute, the project supports field tests covering ESS charge‑discharge strategy iteration, PV consumption optimization and multi‑source micro‑grid coordinated control. Real‑world operational data is accumulated to form standardized, replicable optical‑storage‑charging micro‑grid construction experience. It delivers practical references for similar projects among research institutes, industrial parks and science bases.
