SOLUTIONS
SOLUTIONS

SOLUTIONS

Hybrid Frequency Regulation Scenario with Thermal and Energy Storage Units

 

Core positioning:

To address the shortcomings of thermal power—its slow frequency modulation response and high energy losses—while seizing a foothold in the grid’s ancillary services market, this approach aims to meet the grid’s stringent demands for frequency stability while simultaneously reducing thermal power operating costs.
 

Technology and Value Deepening (Solution Details):

Frequency Modulation Response Plan:

Employing high-rate lithium iron phosphate cells (with a cycle life exceeding 8,000 cycles at a 1C charge/discharge rate), combined with a fast-response PCS (Power Conversion System), the energy storage system achieves a response time of less than 100 milliseconds. This is more than 10 times faster than the 10–30-second response time typically seen in conventional thermal power plants, significantly enhancing frequency modulation accuracy. By precisely controlling the charging and discharging power, the system can stabilize grid frequency deviations within ±0.01 Hz. As a result, the comprehensive frequency modulation performance metric (Kp value) reaches above 4.0—far surpassing the grid’s “2.0 compliance threshold”—enabling higher ratings for frequency modulation services and boosting revenue sharing. For instance, in a 300 MW thermal power project equipped with a 100 MW/50 MWh energy storage system, AGC frequency modulation revenue increased from 0.3 yuan/kWh to 0.5 yuan/kWh, leading to annual income gains exceeding 8 million yuan.
 

Fire-and-Storage Coordination Plan:

Innovative design of the "Primary and Secondary Frequency Modulation Coordination" control logic: Primary frequency modulation is independently handled by the energy storage system, rapidly stabilizing frequency fluctuations. Meanwhile, secondary frequency modulation involves coordinated participation from both the energy storage system and thermal power units, dynamically adjusting the output of thermal plants based on grid load trends. This ensures that thermal power generation consistently operates within the optimal efficiency range—specifically, the load segment with the lowest coal consumption for power generation—thereby reducing coal consumption by 3–5 g/kWh. Based on an annual power generation capacity of 1 billion kWh, this approach could cut standard coal consumption by 3,000 to 5,000 tons per year. Additionally, it minimizes wear-and-tear caused by frequent unit startups/shutdowns and load fluctuations, leading to a 40% reduction in maintenance costs for the power plants.
 

Emergency Support Plan:

Integrating a black-start capability, the energy storage system can autonomously establish stable voltage and frequency during a total grid blackout, thanks to its built-in black-start module. This provides essential startup power—such as supplying electricity to auxiliary equipment like boilers and water pumps—to thermal power units, reducing the time required for thermal plants to restart to within one hour. Compared to conventional methods that rely on external power sources, this approach restores power supply three times faster, significantly minimizing economic losses caused by prolonged grid outages.