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Timed and Power Limited Charging and Discharging

BESS ARBITRAGE SOLUTION

Timed and power limited Charging and discharging

is mainly applied in peak-valley electricity price arbitrage, utilizing low-cost valley electricity to charge from the grid and discharging to the load during peak periods, while making efforts to avoid discharging excess energy to the grid.

Key Features :

Grid Charging: During periods of low electricity prices, the system automatically initiates the charging process, purchasing electricity from the grid. This ensures that the energy storage system is adequately charged for subsequent use during peak demand. 

Load Discharge: When electricity prices are high, the system initiates the discharge process, supplying the stored energy to power the load. This helps users avoid high peak-hour electricity costs while ensuring a reliable power supply to the load.

Avoiding Grid Selling: To minimize selling excess energy back to the grid during high-priced periods, the system employs intelligent scheduling strategies. This ensures that the stored energy is primarily used to fulfill the load demand during peak times, maximizing economic benefits for the user.

Automation and Scheduling: The functionality includes automated scheduling based on preset timing and power control parameters. Users can set the system’s operating mode during different time intervals, considering factors such as electricity price curves and power demand, to achieve optimal economic efficiency.

By incorporating the timed and power limited charging-discharging function, users can flexibly manage energy usage, maximize utilization of electricity market differentials, reduce electricity costs, and enhance overall energy efficiency.

Main control logic ：

1.Timed and power limited charging :

Condition 1: Real-time Grid-to-load Below configured grid-to-load power

If the Real-time Grid-to-load Below configured grid-to-load power

  • PCS charges the battery with the configured charging power.

Condition 2: Real-time Grid-to-load Exceeds configured grid-to-load power

If the Real-time Grid-to-load Exceeds configured grid-to-load :

  • EMS issues a command to PCS to reduce charging power , the reduction value equal to the difference between Real-time Grid-to-load and configured grid-to-load power.
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Note:  Configured charging power should be less than PCS rated charging power

Example Scenario:

Parameters:

  • Transformer’s rated capacity (Maximum allowable grid power): 1000 KW
  • Configured grid-to-load power : 950 KW
  • PCS rated charging power (Maximum charging power): 500 KW
  • PCS configured charging power (Configured maximum charging power): 350KW
  • Maximum Load power: 950 KW
  • Designated charging period: From 00:00 to 06:00

Operational Overview:

  • Real-time grid-to-load power (detected by the bidirectional meter): X (variable, continually changing based on real-time load power and PCS charging power).

When the real-time load power is 590 KW:

PCS charges the battery with the configured charging power 350KW  (Real-time Grid-to-load Below configured grid-to-load power, configured PCS charging power is 350KW )  . Then this charging power remains constant until the EMS issues a new charging power command to PCS

  • If the real-time load power increases to 620 KW:

EMS detect that real-time grid to load power is 970 KW , ( Real-time Grid-to-load Exceeds configured grid-to-load power  . Configured grid-to-load power is 950 KW ) , EMS issues a command to PCS to reduce 20 KW charging power ( the reduction value equal to the difference between Real-time Grid-to-load and configured grid-to-load power ) , then this charging power 330 KW remains constant until the EMS issues a new charging power command to PCS

2.Timed and power limited discharging :

Condition 1: Real-time grid-to-load power is bigger than 0

If the real-time grid-to-load power exceeds configured PCS discharging power

  • EMS issues a command to PCS to discharge the battery with the configured discharging power

Condition 2: Real-time to-grid power is bigger than 0

If the real-time grid-to-load power below configured PCS discharging power :

  • EMS issues a command to PCS to reduce discharging power , the reduction value equal to real-time to-grid power
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Note:  Load power is considered as positive , PCS discharging power is considered as negative , when the cumulative is positive , grid-to-load power is bigger than 0 , when the cumulative is negative , the to-grid power is bigger than 0

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Example Scenario:

Parameters:

  • Transformer’s rated capacity (Maximum allowable grid power): 1000 KW
  • PCS rated charging power (Maximum charging power): 500 KW
  • PCS configured charging power (Configured maximum charging power): 350KW
  • Maximum Load power: 950 KW
  • Designated charging period: From 10:00 to 12:00

Operational Overview:

  • Real-time grid-to-load power (detected by the bidirectional meter): X (variable, continually changing based on real-time load power
  • Real-time to-grid power (detected by the bidirectional meter): X (variable, continually changing based on real-time load power
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When the real-time load power is 360 KW:

PCS discharge the battery with 360KW , real-time grid-to-load power is 10 KW (difference between real-time load power and PCS configured discharging power ). Then this discharging power remains constant until the EMS issues a new discharging power command to PCS.

  • If the real-time load power decreases to 340 KW.

EMS detect that real-time to-grid power is 10 KW , (difference between real-time load power and PCS configured discharging power ) , EMS issues a command to PCS to reduce discharging power to 340 KW , the reduction value equal to real-time to-grid power.