These key formulas help assess the cleaning impact and determine optimal cleaning intervals for photovoltaic power plants:
Photovoltaic Module Power Generation Capacity
- Formula: Lp = 1 – (Wa / Wt)
- Details:
- Wt: Theoretical power generation (kWh)
- Wa: Actual daily power generation (kWh)
Dust Loss Coefficient
- Formula: α = (Wt – Wa) / (Wt × t)
- Details:
- Wt: Theoretical power generation (kWh)
- Wa: Actual daily power generation (kWh)
- t: Duration of dust accumulation (hours)
Economic Cleaning Cycle Function
- Formula: F(t) = L(t) – C
- Details:
- L(t): Power loss due to dust (monetary value)
- C: Cleaning cost (monetary value)
- Power loss calculation: L(t) = Mo × (n’ / n) × (H / α)
- Cleaning cost calculation: C = Mc × N × S
- Parameters:
- Mo: Cost per kWh
- n’: Actual operational days
- n: Total operational days
- H: Effective generation hours
- α: Dust loss coefficient
- Mc: Cleaning cost per square meter
- N: Number of modules cleaned
- S: Area per module (m²)
Cleaning Breakeven Point
- Formula: Qclean – Qdirty = E
- Details:
- Qclean: Daily power of clean modules (kWh)
- Qdirty: Daily power of dirty modules (kWh)
- E: Cleaning cost
Optimal Cleaning Interval
- Formula: T = W / (h × p × f)
- Details:
- W: Revenue loss due to dirt per MW (monetary value)
- h: Average annual operational hours (hours)
- p: Tariff rate per kWh
- f: Cleaning cost per MW
Economic Cleaning Threshold
- Formula: M = Mo × (1 / α)
- Details:
- Mo: Cost per kWh
- α: Dust loss coefficient
Utilizing these formulas enables precise evaluation of cleaning effects and aids in strategizing effective cleaning operations to boost efficiency and economic outcomes of photovoltaic power plants.
