Calculation Formulas for Photovoltaic Power Plant Cleaning Effects and Intervals

These key formulas help assess the cleaning impact and determine optimal cleaning intervals for photovoltaic power plants:

Photovoltaic Module Power Generation Capacity

• Formula: L_p = 1 – (W_a / W_t)
• Details:
  • W_t: Theoretical power generation (kWh)
  • W_a: Actual daily power generation (kWh)

Dust Loss Coefficient

• Formula: α = (W_t – W_a) / (W_t × t)
• Details:
  • W_t: Theoretical power generation (kWh)
  • W_a: 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) = M_o × (n’ / n) × (H / α)
  • Cleaning cost calculation: C = M_c × N × S
• Parameters:
  • M_o: Cost per kWh
  • n’: Actual operational days
  • n: Total operational days
  • H: Effective generation hours
  • α: Dust loss coefficient
  • M_c: Cleaning cost per square meter
  • N: Number of modules cleaned
  • S: Area per module (m²)

Cleaning Breakeven Point

• Formula: Q_clean – Q_dirty = E
• Details:
  • Q_clean: Daily power of clean modules (kWh)
  • Q_dirty: 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 = M_o × (1 / α)
• Details:
  • M_o: 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.