Engee documentation

Synchronous Machine Measurement

Measuring the values of synchronous machine variables in relative units.

blockType: AcausalElectricPowerSystems.Electromechanical.Synchronous.MachineMeasurement

synchronous machine measurement

Path in the library:

/Physical Modeling/Electrical/Electromechanical/Synchronous/Synchronous Machine Measurement

Description

Block Synchronous Machine Measurement outputs a single measurement associated with the connected unit Synchronous Machine Round Rotor or Synchronous Machine Salient Pole. Block entry Synchronous Machine Measurement it 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 block Synchronous Machine Measurement will do the following:

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

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

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

Setting the output parameters Expression of the output value

Field voltage (field circuit base, Efd)

E_fd_fd_pu

Field current (field circuit base, Ifd)

I_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

Entrance

pu — values of variables of the connected synchronous machine
vector

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

  • E_fd_fd_pu

  • I_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 of pass results:q[<br>] vector

The scalar associated with the output.

Parameters

Output — measurement of the values of synchronous machine variables in relative units of
Field voltage (field circuit base, E_fd) (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 | Apparent power | Real power | Reactive power | Terminal voltage | Terminal current | Power factor angle | Power factor | Load angle | Rotor electrical angle

Measurement from a synchronous machine in relative units. Default value — Field voltage (field circuit base, E_fd).

Examples