Performance Motor

The performance_motor class implements the LD1PAC load characteristic model, based on the WECC Air Conditioner Motor Model Test Report and the PowerWorld LD1PAC specification. This model represents compressor and HVAC equipment behavior, including motor states (RUNNING, STALLED, TRIPPED, OFF), voltage-dependent stalling thresholds, reconnection timing, and frequency sensitivity. For detailed technical information on the LD1PAC model, refer to the WECC Air Conditioner Motor Model Test Report and the PowerWorld LD1PAC User Manual.

Performance Motor Parameters

Properties

performance_motor objects are derived from node objects, so any parameters of the node object are available as well.

The I/O column indicates whether a property is user-settable input (I), simulation-computed output (O), or both (IO).

Table 1: erformance_motor table 1

Property Name	Type	Unit	I/O	Description
motor_status	enumeration	N/A	O	the current status of the motor Valid values: RUNNING, STALLED, TRIPPED, OFF.
motor_status_number	int32	N/A	O	the current status of the motor as an integer
Pbase	double	W	I	motor rated size
power_value	complex	VA	IO	motor power consumption
power_factor	double	pu	I	Compressor power factor
delta_f_val	double	N/A	I	Frequency change value for compressor sensitivities
Vbrk	double	pu	I	Compressor motor breakdown voltage
Vstall	double	pu	I	Compressor stall threshold voltage
Vrst	double	pu	I	Voltage at which motor can restart
K_p1	double	pu	I	Real power coefficient for running state 1, puP/puV
K_q1	double	pu	I	Reactive power coefficient for running state 1, puQ/puV
K_p2	double	pu	I	Real power coefficient for running state 2, puP/puV
K_q2	double	pu	I	Reactive power coefficient for running state 2, puQ/puV
N_p1	double	N/A	I	Real power exponent for running state 1
N_q1	double	N/A	I	Reactive power exponent for running state 1
N_p2	double	N/A	I	Real power exponent for running state 2
N_q2	double	N/A	I	Reactive power exponent for running state 2
CmpKpf	double	pu	I	Real power frequency sensitivity in puP/puf
CmpKqf	double	pu	I	Reactive power frequency sensitivity in puQ/puf
stall_impedance	complex	pu	I	compressor stall imepdance
stall_resistance	double	pu	I	compressor stall resistance
stall_reactance	double	pu	I	compressor stall reactance
Tstall	double	s	I	stall time
reconnect_time	double	s	I	reconnect time after a trip
Pinit	double	pu	I	Initial assumed real power loading of connected terminal
Vinit	double	pu	I	Initial assumed voltage value of connected terminal

Internal Properties

Internal Properties

These properties are published with PA_HIDDEN and are intended for internal or developer use.

Table 2: erformance_motor table 2

Property Name	Type	Unit	I/O	Description
Vstallbrk	double	N/A	—	Intersection point for power curve and power stall curve - calculated
P_val	double	pu	O	real power portion of motor power consumption calculation
Q_val	double	pu	O	reactive power portion of motor power consumption calculation
P_0	double	pu	—	Computed power curve initialization point - real power
Q_0	double	pu	—	Computed power curve initialization point - reactive power
stall_time_tracker	double	s	—	internal stall time tracker variable
reconnect_time_tracker	double	s	—	internal reconnect time tracker variable