// technical guide: compliance
Navigating the QD378-EVN Standards
MAR 12, 2025
//
REGULATORY COMPLIANCE UNIT
Understanding the latest grid-connection requirements for self-consumption solar power (ĐMTMN). We break down Decision No. 378/QD-EVN (2025) and Circular 46/2025/TT-BCT.
A. Connection & Monitoring Requirements
Data Transmission
- • Real-time Power (P): Min 5 min cycle
- • Daily Energy (A): 1 time / day
- • Inverter Config Management
Data Storage
- • History: Min 7 days storage
- • Resolution: 5 minute increments
- • Reliability: Local backup + Auto-sync
⚠️ Non-export systems: No remote control (SetPoint) required from EVN dispatch centers.
B. Protocols & Security
| Protocol | Default Port | Notes |
|---|---|---|
| Modbus TCP | 502 | IP/Subnet provided by EVN |
| IEC 60870-5-104 | 2404 | Standardized grid telemetry |
// Security: TLS Encryption or OpenVPN/IPSec tunnel mandated.
C. Signal Mapping (Mandatory)
| Signal Name | IEC 104 Addr | Modbus Addr |
|---|---|---|
| P-out (Grid Power) | T13 - Addr 1 | T04 - Addr 1 |
| Pinv-out (Total Inv) | T13 - Addr 2 | T04 - Addr 3 |
| Ainv_D-1 (Prev Day Energy) | T13 - Addr 3 | T04 - Addr 5 |
C+. Recommended Signals (To Addr 11)
| Signal | IEC 104 | Modbus |
|---|---|---|
| kVAr (Reactive Power) | T13 - Addr 4 | T04 - Addr 7 |
| Voltage (Ua, Ub, Uc) | Addr 5, 6, 7 | Addr 9, 11, 13 |
| Current (Ia, Ib, Ic) | Addr 8, 9, 10 | Addr 15, 17, 19 |
| Frequency (Hz) | T13 - Addr 11 | T04 - Addr 21 |
D. Metering & Connection
Commercial meter systems must follow **Circular 05/2025/TT-BCT** (Feb 1, 2025). Meters must be on EVN's approved list and compatible with the centralized data collection system (HES).
E. Network Infrastructure
Speed
≥ 64 kbps
Latency
≤ 125 ms
Types
4G/5G, Internet, RF