Enhancing Grid Stability with Yohoo Elec: AGC & AVC in Solar Power Plants

As the power industry shifts toward renewables, solar energy must evolve from being just a source of generation to a dynamic grid participant. Yohoo Elec integrates two core technologies into its solar and storage systems: AGC (Automatic Generation Control) and AVC (Automatic Voltage Control). These systems empower solar power plants to help stabilize both grid frequency and voltage, ensuring compliance, reliability, and smart grid integration.

What is AGC – Automatic Generation Control?

AGC is designed to maintain grid frequency stability by balancing the real (active) power supply and demand. Yohoo Elec solar plants equipped with AGC can adjust their output in real-time according to commands from the grid operator.

Key Features:

• Maintains system frequency (e.g., 50Hz)

• Controls active power output from inverters

• Enables real-time communication with the grid dispatch center

AGC Operation:
The Energy Management System (EMS) calculates real-time power requirements. Setpoints are sent to the solar station, and Yohoo Elec's inverters quickly adjust output to meet the target.

Enhanced with Energy Storage:
With battery storage, AGC control is significantly more flexible. The system can charge or discharge to meet AGC demands, improving both upward and downward response capabilities.

Benefits:

• Frequency stability in high-renewable grids

• Compliance with modern grid codes

• Additional revenue from ancillary service markets

What is AVC – Automatic Voltage Control?

AVC ensures voltage levels at the grid connection point remain stable. It adjusts the reactive power output of the plant or directly controls the POI (Point of Interconnection) voltage.

Key Features:

• Maintains grid voltage within ±5% to ±10% of nominal

• Controls reactive power (Q) from inverters or external devices

• Responds to dispatch center voltage setpoints

AVC Operation:
Based on system voltage data, Yohoo Elec’s AVC system coordinates inverter or compensator output to stabilize voltage and reduce power losses.

Support Devices:

• Reactive power control via inverters (cosφ adjustment)

• SVG or SVC devices (if installed)

• On-load tap changers (OLTCs) in transformers

Benefits:

• Voltage stability in variable solar environments

• Reduced transmission losses

• Improved fault ride-through and system resilience

AGC vs. AVC – Key Differences and Synergies

Together, these systems transform Yohoo Elec solar plants into intelligent, grid-friendly assets — not just producers, but stabilizers and supporters of the modern grid.

Overcoming Challenges

AGC and AVC operation faces challenges like solar intermittency, equipment wear from frequent adjustments, and the need for high-speed communication. Yohoo Elec’s integration of energy storage and smart inverter control ensures smooth operation and high accuracy.

With Yohoo Elec, your solar power plant becomes a future-proof grid asset.