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Project-specific controller tuning blue'Log XC
Project-specific controller tuning blue'Log XC
Item no. 557.201
Define control behavior in the planning phase.
Description
The controller blue'Log XC is already pre-parameterized at the factory to guarantee manufacturer-independent, robust control even with a high diversity of available PV inverters on the market.
Whether highly dynamic Zero feed-in for PV self-consumption systems or reactive power control of solar power plants with improved response time requirements – through project-specific controller tuning, the controller blue'Log XC guarantees the required dynamics already in the planning phase.
The harmonization of all dead times in the system enables a precise adjustment of the control behaviour and makes time-consuming, manual controller tuning in the field (trial-and-error) no longer necessary.
Exemplary requirements on control dynamics
Initial delay TV: Initial delay in activation of active power frequency response (LFSM-O).
Rise time Trise 90%: Time between the setpoint step change and the point in time at which the controlled variable (for example, reactive power Q) reaches 90 % of the setpoint change for the first time.
Settling time Tsettling Δx: Time between the erratic setpoint change and the point in time at which the transient process has decayed to such an extent that the controlled variable (for example, reactive power Q) lies within the tolerance band around the steady-state value and remains there.
Initial delay TV | Rise time Trise 90% | Settling time Tsettling Δx | |
|---|---|---|---|
Active power decrease at overfrequency (LFSM-O) | ≤ 2 s 1) | ≤ 2 s 2) | ≤ 20 s 2) |
Active power controllability Pvar | – | – | 0.33 … 0.66 %/s 3) |
Voltage control Q (U droop) | – | 1 … 5 s 4) | 5 … 60 s 4) |
Reactive power control Qvar | – | 1 … 5 s 5) | 6 … 60 s 6) |
Power factor control cos ϕvar | – | ≤ 60 s 5) | ≤ 60 s 6) |
1) Requirement according to Network Code (NC) Requirements for Generators (RfG) / EU regulation 2016/631, Article 13(2)(e).
2) Requirement according to VDE-AR-N 4110:2018-11 (TCR medium voltage), chapter 10.2.4.3 (Power-generating system Type 2 / PV system).
3) Requirement according to VDE-AR-N 4110:2018-11 (TCR medium voltage), chapter 10.2.4.1 (No absolute settling time).
4) Requirement according to Network Code (NC) Requirements for Generators (RfG) / EU regulation 2016/631, Article 21(3)(d).
5) Requirement according to VDE-AR-N 4120:2018-11 (TCR high voltage), chapter 10.2.2.4.
6) Requirement according to VDE-AR-N 4110:2018-11 (TCR medium voltage), chapter 10.2.2.4.
Extended controller parameterization, active power
The behaviour of the active power control can be adjusted by parameterization depending on system-specific and regulatory requirements.
The following parameters are available for this purpose:
Parameter | Value range | Factory setting 7) |
|---|---|---|
Controller sample time ts | 200 ms | 500 ms | 500 ms |
Proportional gain coefficient Kp | -1,000 … 1,000 | 0.1180 |
Integral gain coefficient Ki | -1,000 … 1,000 | 0.0672 |
Dead zone / DZlower limit | -10 … 0 % | -0.5 % |
Dead zone / DZupper limit | 0 … 10 % | 0 % |
Correction value limiting / Py, lower limit | 0 … 125 % | 0 % |
Correction value limiting / Py, upper limit | 0 … 125 % | 125 % |
7) The controller tuning in the factory setting guarantees a PT1 transient response for the active power control with 3 tau = 60 s (tolerance band ΔP = 2 %) for a dead time of the controlled system (Power-generating unit (PGU settling time) of 3.0 s.
Extended controller parameterization, reactive power
The behaviour of the reactive power control can be adjusted by parameterization depending on system-specific and regulatory requirements.
The following parameters are available for this purpose:
Parameter | Value range | Factory setting 8) |
|---|---|---|
Controller sample time ts | 200 ms | 500 ms | 500 ms |
Proportional gain coefficient Kp | -1,000 … 1,000 | 0.1110 |
Integral gain coefficient Ki | -1,000 … 1,000 | 0.0493 |
Dead zone / DZlower limit | -10 … 0 % | -0.5 % |
Dead zone / DZupper limit | 0 … 10 % | 0.5 % |
Correction value limiting / Qy, lower limit | 0 … 100 % | 60 % |
Correction value limiting / Qy, upper limit | 0 … 100 % | 60 % |
Correction value limiting / cos ϕy, lower limit | 0 … 1 | 0.8 |
Correction value limiting / cos ϕy, upper limit | 0 … 1 | 0.8 |
8) The controller tuning in the factory setting guarantees a PT1 transient response for the reactive power control with 3 tau = 60 s according to VDE-AR-N 4110:2018-11 (TCR medium voltage) for a dead time of the controlled system (Power-generating unit (PGU) settling time) of 1.5 s.
Additional notes
Data collection: Data collection sheet with project-specific data and control requirements needs to be provided by customer.
Simulation results: The simulation results are provided with the ‘Simulation Results Report’.
Control behavior: Deviations of the real control characteristics (rise time, settling time, steady-state error) from the simulation result cannot be completely avoided.
Controller parameterization/site acceptance tests (SAT): Controller parameterization and execution of grid code compliance (GCC) site acceptance tests (SAT) are not within scope of delivery.