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Peak Shaving and Load Shifting for Existing PV plant

Eliminate the power limit from grid

Peak Shaving and Load Shifting for Existing PV plant

is an integrated power generation solution that combines photovoltaic (PV) solar generation with energy storage technology. Employing an AC-coupling scheme, this system features the parallel connection of PV inverters and PCS on the AC side, facilitating their collaborative operation. This design ensures a stable and reliable power supply for commercial and industrial users while maximizing the utilization of solar energy resources. The system offers peak shaving and load shifting applications, optimizing energy consumption during peak demand periods. By intelligently managing energy usage patterns, the system helps reduce overall electricity costs for commercial and industrial users.

Key Features :

Commercial and Industrial Users: Tailored for a wide range of commercial and industrial users, providing them with an efficient and stable power supply.

C&I Solar Systems for Self-Consumption or Excess Generation to the Grid: Ideal for commercial and industrial users with the capability to use self-generated solar power and feed excess electricity back into the grid. This maximizes the efficient utilization of solar energy.

C&I Solar Systems in Areas with No or Low Grid Feed-In Tariffs: In situations where grid feed-in tariffs are absent or minimal, the system can offer an economically efficient power solution.

 Limit PV feed-in power : Allowing precise control over the amount of solar energy sent back to the grid. This feature is particularly advantageous in scenarios where grid regulations or economic considerations necessitate the restriction of PV feed-in

Main control logic ：

  1. Limitation to-grid power :

Condition 1 : Real-time to-grid exceeds configured PV to-grid power

If the Real-time to-grid power exceeds configured to-grid power ,

  • EMS promptly instructs the PCS to initiate battery charging with a fixed power equal to the difference between real-time to-grid power and configured to-grid power . ( The configured to-grid power can be 0 )

 

Example Scenario:

Parameters:

  • PCS rated charging power (Maximum charging power): 500 KW
  • Configured PV backflow to grid power: 0 KW
  • PV rated power :500 KW
  • PCS charging power : 400 KW
  • PCS rated charging power : 500 KW
  • Transformer’s rated capacity (Maximum allowable grid power): 1000 KW
  • Maximum Load power: 1000 KW

Operational Overview:

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

When the real-time load power is 100 KW , PV real-time power is 400 KW :

As the PV is generating more power then the load needed , so the advanced power will backflow to the grid , EMS detect the PV to-grid power is 300 KW , instructs the PCS to initiate battery charging with 300 KW equal to the difference between Real-time PV backflow to grid exceeds configured PV back flow to grid power (300KW-0KW) .

  • If the real-time load power increases to 400 KW , PV real-time power remains the same as 400 KW :

As the PV is generating the same power  , and load power increases 300 KW than before ,EMS detects the to-grid power is

< – 300KW >, instructs the PCS to reduce 300 KW charging power to 0 KW .

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

  1. Limitation Grid to load :

Condition 1: Real-time grid to load power exceeds configured grid to load power

If the Real-time grid to load power exceeds configured grid to load power:

  • EMS promptly instructs the PCS to initiate battery discharging with a fixed power equal to the difference between : Real-time grid to load power and configured grid to load power . ( The configured grid to load power can be 0 , the PCS configured power should be higher than maximum Load power , if the main Load is inductive , the load should be initiated by grid )

 

Example Scenario:

Parameters:

  • Transformer’s rated capacity (Maximum allowable grid power): 1000 KW
  • PCS configured discharging power (Configured maximum discharging power): 700KW
  • PCS rated discharging power (Maximum charging power): 800 KW
  • Configured grid to load power : 0 KW
  • Maximum Load power: 700 KW
  • PV rated Power : 700 KW

Operational Overview :

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

When the real-time load power is 700 KW , PV real-time power is 400 KW :

As the PV is generating less power then the load needed , so the load will get energy from the grid  , EMS detect the power from grid to load is 300 KW , instructs the PCS to initiate battery discharging with 300 KW equal to the difference between : Real-time grid to load power ( 300 KW )and configured grid to load power（0 KW）.

  • If real-time load power remains the same as 700 KW , PV real-time power increases to 700 KW :

As the load power is the same , PV power increases 300 KW   ,  the gri- to-load power becomes -300 KW , EMS detect the power from grid to load is < – 300 KW > , instructs the PCS to reduce discharging power  to 0KW .

  • If real-time load power remains the same as 700 KW , PV real-time power decreases to 0 KW :

As the load power is the same , PV power decreases 700 KW , the grid-to-load power becomes 700 KW  , EMS detect the power from grid to load is 700 KW , instructs the PCS to initiate battery discharging with 700 KW equal to the difference between : Real-time grid to load power ( 700 KW )and configured grid to load power（0 KW）.