Engee documentation

Synchronous Machine Measurement

Measurement of synchronous machine variable values in relative units.

synchronous machine measurement

Description

The Synchronous Machine Measurement block outputs a single measurement associated with a connected Synchronous Machine Round Rotor or Synchronous Machine Salient Pole block. The input of the Synchronous Machine Measurement unit is connected to the output port of the synchronous machine unit.

The Output parameter is set to measure the values of the synchronous machine variables in relative units. Depending on the selected value, the Synchronous Machine Measurement block will do the following:

  • Directly outputs the value of the element in the input vector.

  • Calculates the unit measurement value using the values of the elements in the input signal vector in mathematical expressions.

The Synchronous Machine Measurement block outputs the synchronous machine measurement value in relative units according to the output value expressions given in the table. For example, when the Output parameter is set to Stator d-axis voltage, the block outputs directly the value of the pu_ed element in the input signal vector. However, when the Output parameter is set to Reactive power, the block calculates the value from the pu_ed, pu_eq, pu_id and pu_iq elements.

Output parameter setting Output value expression

Field voltage (field circuit base, Efd)

E_fd_fd_fd_pu

Field current (field circuit base, Ifd)

I_fd_fd_fd_pu

Electrical torque

torque_pu

Rotor velocity

angular_velocity_pu

Stator d-axis voltage

e_d_pu

Stator q-axis voltage

e_q_pu

Stator zero-sequence voltage

e_0_pu

Stator d-axis current

i_d_pu

Stator q-axis current

i_q_pu

Stator zero-sequence current

i_0_pu

Apparent power

S_t_pu,

Real power

P_t_pu,

P_t_pu = (e_d_pu*i_d_pu)+(e_q_pu*i_q_pu)+2(e_0_pu*i_0_pu)

Reactive power

Q_t_pu,

Q_t_pu = (e_q_pu*i_d_pu)-(e_d_pu*i_q_pu)

Terminal voltage

V_t_pu,

Terminal current

I_t_pu,

Power factor angle (rad)

power_factor_angle,

power_factor_angle = atan2(Q_t_pu, P_t_pu)

Power factor

power_factor,

cos(power_factor_angle)

Load angle (rad)

load_angle,

load_angle(rad) = atan2(e_d_pu, e_q_pu)

Rotor electrical angle

rotor_electrical_angle,

Ports

Input

pu - values of variables of the connected synchronous machine
vector

A port containing the values of the synchronous machine variables in relative units. Then the element vectors are represented in the form:

  • E_fd_fd_fd_pu.

  • I_fd_fd_fd_pu.

  • torque_pu

  • angular_velocity_pu

  • e_d_pu

  • e_q_pu

  • e_0_pu

  • i_d_pu

  • i_q_pu

  • i_0_pu

Output

Port_1 - output results
vector

The scalar associated with the output.

Parameters

Output - measurement of synchronous machine variables in relative units
Field voltage (field circuit base, E_fd) (by default) | Field current (field circuit base, I_fd)| Electrical torque | Rotor velocity | Stator d-axis voltage | Stator q-axis voltage | Stator zero-sequence voltage | Stator d-axis current | Stator q-axis current | Stator zero-sequence current | `Stator zero-sequence current | `Apparent power | `Real power | `Reactive power | `Terminal voltage | `Terminal current | `Power factor angle | `Power factor | `Load angle | `Rotor electrical angle

Measurement from the synchronous machine in relative units. The value by default is Field voltage (field circuit base, E_fd).