CN115371346B - Starting control method and device for variable frequency compressor and refrigeration equipment - Google Patents
Starting control method and device for variable frequency compressor and refrigeration equipment Download PDFInfo
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- CN115371346B CN115371346B CN202110534461.7A CN202110534461A CN115371346B CN 115371346 B CN115371346 B CN 115371346B CN 202110534461 A CN202110534461 A CN 202110534461A CN 115371346 B CN115371346 B CN 115371346B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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Abstract
The invention discloses a starting control method, a starting control device and refrigeration equipment of a variable frequency compressor. The starting control method comprises the following steps: dividing a starting process of the variable frequency compressor into a plurality of time periods; during each of said time periods, a current loop, a speed loop and/or a position loop of the control vector control system is operated based on preset proportional coefficient values and/or integral coefficient values to control the start-up procedure. According to the starting control method of the variable frequency compressor, at least one of the current loop, the speed loop and the position loop operates in different time periods of the starting process of the variable frequency compressor based on the corresponding preset proportional coefficient value and/or integral coefficient value, so that the starting process of the variable frequency compressor is controlled, the stable starting of the variable frequency compressor can be realized, and the starting failure rate of the variable frequency compressor is effectively reduced.
Description
Technical Field
The invention relates to the field of electrical equipment, in particular to a starting control method and device for a variable frequency compressor and refrigeration equipment.
Background
The variable frequency compressor is an important component of refrigeration equipment such as refrigerators and the like. Smooth start of the inverter compressor has been a technical difficulty. Fig. 1 is a block diagram of a vector control system of a variable frequency compressor, which is a double closed-loop control system consisting of a current loop and a speed loop. The control principle is as follows: when a given speed command is not zero, detecting stator phase current, then carrying out Clarke change and Park conversion on the current to obtain current and related voltage of two-phase rotating coordinates, obtaining the actual rotating speed, the difference between the actual rotating speed and the command rotating speed of the Motor according to a related algorithm of the detected speed, obtaining a command value of the current through PI regulation, controlling the current by using the maximum torque current ratio MTPA, comparing the current with the actual current command value, obtaining voltage under the regulated rotating coordinates through PI regulation, carrying out SVPWM calculation through Park change and angle to obtain related three-phase voltage, and finally driving a compressor (PMSM Motor) to work through a three-phase inverter (3 phase inverter) to realize sensorless vector control of the Motor. Fig. 2 is a block diagram of another prior art vector control system.
The motor frequency versus time for a typical inverter compressor start-up process is shown in fig. 3: divided into rotor position determination (T 1 Period), asynchronous drag open loop operation (T) 2 Period) and switching from open loop to closed loop steady operation (T) 3 Period) three parts:
for rotor position acquisition, the current practice is to orient with the magnetic field, specifically by changing the coordinates so that i q Equal to 0, i d The linearity increases to a fixed value so that the poles of the rotor are fixed at a certain angle.
On the basis of rotor position determination, the rotating speed of the rotor is increased by a certain speed, so that the rotating speed reaches a specified rotating speed, and the position of the rotor can be calculated by a position-sensor-free algorithm. In the drag open loop phase, hold i d And i q The speed of the compressor is set to a set value according to the speed command, at which stage the speed is open-loop. When the compressor reaches the open-loop regulated rotating speed, the position of the rotor can be estimated through a position-free sensor, so that i d The current of (2) is gradually changed to 0, i in a sinusoidal manner q The value of (2) increases to a specified current value in a sinusoidal manner. The time of this process is generally short.
After the conversion is completed, the speed is closed loop, the actual rotation speed of the rotor is estimated through a position-free sensor, the command value of the speed is tracked, and finally the purpose of stable operation is achieved. The control parameter values are selected to be proper according to experience, and the starting process and the related control parameter values are changed, so that the compressor is stable and rapid in the starting process.
In the starting process of the compressor in the prior art, a starting failure condition often occurs, and the starting failure condition is generally caused by the following defects:
in vector control, speed position feedback estimation, d-axis, q-axis current (i ds 、i qs ) The inductance parameter value (L) of the compressor is used for calculation d 、L q )，The inductance parameter value is very important for accurate control of the compressor. In the open loop phase, the starting current of the compressor is greater than during normal operation. As shown in fig. 4, in the prior art, the d-axis inductance and the q-axis inductance of the compressor become smaller as the compressor current becomes larger, so that the compressor finally reaches a saturated state, and the inductance is not fixed in the whole process, so that the start failure of the compressor is extremely easy to cause;
in the starting open loop stage, the rotating speed is required to be increased from 1Hz to more than 20Hz in a short time (generally in 2 seconds), a large open loop starting current and acceleration are required, and when the heavy load is started, the current and speed change can cause out of control if the current and speed change cannot be tracked in time and are subjected to feedback control, so that the starting failure is caused. Therefore, it is necessary to adjust the proportional coefficient value and the integral coefficient value of the current loop, the speed loop and the position phase-locked loop during the start-up of the open loop, in the prior art, the adjustment of these parameter values is not reasonable enough, and is very easy to be too small or too large, when these parameter values are too small, the adjustment cannot be performed, so that stall is caused, when these parameter values are too large, the speed fluctuation is caused, and when these parameter values are too large, overspeed or overcurrent protection is caused.
Therefore, overcoming the above-mentioned drawbacks to realize a stable start of the inverter compressor is a technical problem to be solved.
Disclosure of Invention
The invention mainly aims to provide a starting control method of a variable frequency compressor, a starting control device of the variable frequency compressor and refrigeration equipment, and aims to solve the technical problems that the starting process of the existing variable frequency compressor is not stable enough and the starting failure rate is high.
In order to achieve the above object, the present invention provides a startup control method of a variable frequency compressor, comprising:
dividing a starting process of the variable frequency compressor into a plurality of time periods;
during each of said time periods, a current loop, a speed loop and/or a position loop of the control vector control system is operated based on preset proportional coefficient values and/or integral coefficient values to control the start-up procedure.
Further, the current loop, the speed loop and/or the position loop of the control vector control system operate based on preset proportional coefficient values and/or integral coefficient values, comprising:
controlling the current loop, the speed loop and/or the position loop to operate based on preset proportional coefficient values and/or integral coefficient values respectively in three periods of the whole open loop phase and the closed loop phase;
the three time periods are arranged according to time sequence, wherein a first time period is a time period in which the motor frequency of the variable frequency compressor is linearly reduced, a second time period is a time period in which the motor frequency is kept constant, and a third time period is a time period in which the motor frequency is linearly increased; the start-up procedure includes the open loop phase and the closed loop phase.
Further, the controlling the current loop, the speed loop and/or the position loop to operate based on preset proportional and/or integral coefficient values, respectively, throughout three periods of the open loop phase and the closed loop phase, comprises:
in the open loop stage, controlling the current loop to keep a preset first proportional coefficient value in operation;
controlling the current loop to maintain a preset second proportional coefficient value in operation within the first period; wherein the second scaling factor value is at least twice the first scaling factor value;
controlling the current loop to maintain a preset third proportional coefficient value in operation in the second period; the third scale factor value is greater than the first scale factor value and less than the second scale factor value;
and in the third period, controlling the ratio coefficient value of the current loop to be linearly reduced from the third ratio coefficient value to a preset fourth ratio coefficient value in operation.
Further, the controlling the current loop, the speed loop and/or the position loop to operate based on preset proportional and/or integral coefficient values, respectively, throughout three periods of the open loop phase and the closed loop phase, comprises:
controlling the current loop to maintain a preset first integral coefficient value in operation in the open loop stage and the first period;
controlling the current loop to maintain a preset second integral coefficient value in operation in the second period; the second integral coefficient value is greater than the first integral coefficient value;
and during the third period, controlling the current loop to keep the first integral coefficient value in operation.
Further, the controlling the current loop, the speed loop and/or the position loop to operate based on preset proportional and/or integral coefficient values, respectively, throughout three periods of the open loop phase and the closed loop phase, comprises:
controlling the speed loop to maintain a preset fifth ratio coefficient value in operation in the first period and the second period;
and in the third period, controlling the ratio coefficient value of the speed loop to be linearly increased from the fifth ratio coefficient value to a preset sixth ratio coefficient value in operation.
Further, the controlling the current loop, the speed loop and/or the position loop to operate based on preset proportional and/or integral coefficient values, respectively, throughout three periods of the open loop phase and the closed loop phase, comprises:
controlling the speed loop to maintain a preset third integral coefficient value in operation in the first period and the second period;
and in the third period, controlling the integral coefficient value of the speed loop to be linearly increased from the third integral coefficient value to a preset fourth integral coefficient value in operation.
Further, the controlling the current loop, the speed loop and/or the position loop to operate based on preset proportional and/or integral coefficient values, respectively, throughout three periods of the open loop phase and the closed loop phase, comprises:
controlling the position loop to maintain a preset seventh ratio coefficient value in operation in the first period and the second period;
and in the third period, controlling the ratio coefficient value of the position ring to be linearly reduced to a preset eighth ratio coefficient value from the seventh ratio coefficient value in operation.
Further, the controlling the current loop, the speed loop and/or the position loop to operate based on preset proportional and/or integral coefficient values, respectively, throughout three periods of the open loop phase and the closed loop phase, comprises:
controlling the position loop to keep a preset fifth integral coefficient value in operation in the first period and the second period;
and in the third period, controlling the integral coefficient value of the position ring to be linearly increased from the fifth integral coefficient value to a preset sixth integral coefficient value in operation.
Further, the start control method further includes:
and in the open loop stage, the first period, the second period and the third period, regulating and controlling the inductance parameter value of the variable frequency compressor to be a preset inductance parameter value.
Further, in the open loop stage, the first period, the second period, and the third period, adjusting the inductance parameter value of the inverter compressor to a corresponding preset inductance parameter value includes:
in the open loop stage, the first period and the second period, adjusting and controlling the quadrature axis inductance parameter value of the variable frequency compressor to be a preset first quadrature axis inductance parameter value;
in the third period, regulating and controlling the quadrature axis inductance parameter value of the variable frequency compressor to be linearly increased from the first quadrature axis inductance parameter value to a preset second quadrature axis inductance parameter value;
in the open loop stage, the first period and the second period, regulating and controlling the direct-axis inductance parameter value of the variable frequency compressor to be a preset first direct-axis inductance parameter value;
in the third period, regulating and controlling the direct-axis inductance parameter value of the variable frequency compressor to be linearly increased from the first direct-axis inductance parameter value to a preset second direct-axis inductance parameter value;
the first quadrature axis inductance parameter value is greater than the first direct axis inductance parameter value, and the second quadrature axis inductance parameter value is greater than the second direct axis inductance parameter value.
The invention also provides a starting control device of the variable frequency compressor, which comprises:
the dividing module is used for dividing the starting process of the variable frequency compressor into a plurality of time periods;
and the control module is used for controlling the current loop, the speed loop and/or the position loop of the vector control system to operate based on preset proportional coefficient values and/or integral coefficient values in each time period so as to control the starting process.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the program to realize the starting control method of the variable frequency compressor of any one of the above.
The present invention also provides a computer-readable storage medium having stored thereon a computer program that is executed by a processor to implement the start control method of the inverter compressor of any one of the above.
The invention also provides refrigeration equipment which comprises the variable frequency compressor and the starting control device or the electronic equipment for controlling the variable frequency compressor.
According to the starting control method of the variable frequency compressor, at least one of the current loop, the speed loop and the position loop operates in different time periods of the starting process of the variable frequency compressor based on the corresponding preset proportional coefficient value and/or integral coefficient value, so that the starting process of the variable frequency compressor is controlled, stable starting of the variable frequency compressor can be achieved, and the starting failure rate of the variable frequency compressor is effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art vector control system;
FIG. 2 is a schematic diagram of another prior art vector control system;
FIG. 3 is a graph showing the relationship between motor frequency and time during the start-up of a variable frequency compressor of the prior art;
FIG. 4 is a graph showing the variation of the direct axis and quadrature axis inductances with the variable frequency compressor current during the start-up process of the variable frequency compressor of the prior art;
FIG. 5 shows a proportional coefficient value versus time curve and an integral coefficient value versus time curve of a current loop according to an embodiment of the present application;
FIG. 6 illustrates a ratio coefficient value versus time curve and an integral coefficient value versus time curve for a speed loop according to an embodiment of the present application;
FIG. 7 is a graph showing proportional coefficient values versus time and integral coefficient values versus time for a position phase locked loop according to an embodiment of the present application;
fig. 8 shows a direct axis inductance parameter versus time curve and a quadrature axis inductance parameter versus time curve of a variable frequency compressor according to an embodiment of the present application.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
An embodiment of the present application provides a startup control method of a variable frequency compressor, including: the starting process of the variable frequency compressor is divided into a plurality of time periods, and in each time period, a current loop, a speed loop and/or a position loop of the control vector control system are operated based on preset proportional coefficient values and/or integral coefficient values so as to control the starting process. The vector control system includes a current loop, a speed loop, and a position phase locked loop.
Specifically, at least one of the current loop, the speed loop and the position phase-locked loop can be selectively controlled to operate based on a corresponding preset proportional coefficient value and/or a corresponding preset integral coefficient value in different periods of the starting process of the variable frequency compressor, so as to realize the regulation and control of the starting process of the variable frequency compressor.
The starting control method provided by the embodiment of the application can realize stable starting of the variable frequency compressor and effectively avoid failure in starting the variable frequency compressor.
As shown in fig. 5, the start-up process of the inverter compressor includes an open loop stage T 2 And closed loop phase T 3 The method comprises the steps of carrying out a first treatment on the surface of the Closed loop phase T 3 From first time periods T arranged in time sequence 3-1 A second period of time T 3-2 And a third period T 3-3 Composition; wherein the first period T 3-1 For a period of linearly decreasing motor frequency of the inverter compressor, a second period T 3-2 For a period of time in which the motor frequency is kept constant, a third period of time T 3-3 For a period of linear increase in motor frequency. First period T 3-1 A second period of time T 3-2 And a third period T 3-3 May also be correspondingly referred to as an initial change period, an intermediate period, and a steady state period, respectively. A position phase locked loop may also be referred to as a position loop.
In particular, the current loop, the speed loop and/or the position phase-locked loop are controlled in an open loop phase, a first period of time T 3-1 A second period of time T 3-2 And a third period T 3-3 The internal is operated based on corresponding preset proportional coefficient values and/or integral coefficient values.
Open loop stage T 2 First period T 3-1 A second period of time T 3-2 And a third period T 3-3 The value of (2) can be adjusted according to the actual requirement, for example, the first period T can be set 3-1 Is 0.5s, a second period of time T is set 3-2 Is 4.5s long.
As shown in fig. 5, l1 represents a time-dependent curve of the motor frequency, l2 represents a time-dependent curve of the integral coefficient value of the current loop, l3 represents a time-dependent curve of the proportional coefficient value of the current loop,
the coordinates of each point on l2 are respectively
Point G (T) 0 +T 1 CKi 0), point H (T 0 +T 1 +T 2 +T 3-1 CKi 0), point I (T) 0 +T 1 +T 2 +T 3-1 ,CKi1)，
Point J (T) 0 +T 1 +T 2 +T 3-1 +T 3-2 CKi 1), point K (T 0 +T 1 +T 2 +T 3-1 +T 3-2 ,CKi0)，
Point L (T) 0 +T 1 +T 2 +T 3 ,CKi0)；
The coordinates of each point on l3 are respectively
Point A (T) 0 +T 1 CKp 0), point B (T 0 +T 1 +T 2 CKp 0), point C (T 0 +T 1 +T 2 ,CKp1)，
Point C' (T) 0 +T 1 +T 2 +T 3-1 CKp 1), point D (T 0 +T 1 +T 2 +T 3-1 ,CKp2)，
Point E (T) 0 +T 1 +T 2 +T 3-1 +T 3-2 CKp 2), point F (T 0 +T 1 +T 2 +T 3 ,CKp3)；
In the open loop stage T 2 In the control current loop, the proportion coefficient value is kept to be a preset CKp0 in operation; line segment AB is the current loop in the open loop stage T 2 Inside scale factor value curve.
During a first period T 3-1 In, the control current loop keeps a preset proportional coefficient value CKp1 in operation; wherein CKp1 is more than or equal to 2 times CKp0. First period T 3-1 Is the initial change period of the closed loop phase, the required current is large, and thus the preset CKp1 is large, at least 2 times CKp0, which ensures that a sufficiently large current is supplied.
In the second period T 3-2 In, the control current loop keeps a preset proportional coefficient value CKp2 in operation; CKp0 < CKp2 < CKp1. Second period T 3-2 Is an intermediate period of the closed loop phase, the required current is greater than the first period T 3-1 Smaller than the open loop stage T 2 The current required is large.
In a third period T 3-3 In operation, the scaling factor of the control current loop is linearly reduced from CKp2 to a predetermined CKp3. Third period T 3-3 Is the steady state period of the closed loop phase, the required current decreases, thus setting the scaling factor to decrease linearly from CKp2 to a preset CKp3.
The current loop operates based on the proportional coefficient value corresponding to the preset current loop in different time periods in the starting process of the variable frequency compressor, so that the difference value between the current set value and the current feedback value in each time period in the starting process can be quickly adjusted, the current of the variable frequency compressor can be timely and accurately adjusted, and the starting process of the variable frequency compressor can be accurately controlled.
In the open loop stage T 2 And a first period of time T 3-1 In, the control current loop maintains a preset integral coefficient value CKi during operation;
in the second period T 3-2 In, the control current loop maintains a preset integral coefficient value CKi during operation; CKi1 > CKi;
in a third period T 3-3 In operation, the integral coefficient value of the control current loop is kept CKi0.
The control current loop operates based on the integral coefficient value of the corresponding preset current loop in different time periods in the starting process of the variable frequency compressor, so that the difference value between the current set value and the current feedback value in each time period in the starting process can be stably adjusted, the current of the variable frequency compressor can be stably and accurately adjusted, and the stable control of the starting process of the variable frequency compressor can be realized.
As shown in fig. 6, l4 represents the ratio coefficient value of the speed loop versus time, l5 represents the integral coefficient value of the speed loop versus time,
the coordinates of each point on l4 are respectively
M(T 0 +T 1 +T 2 ,SKp1),N(T 0 +T 1 +T 2 +T 3-1 +T 3-2 ,SKp1),O(T 0 +T 1 +T 2 +T 3 ,SKp2)；
The coordinates of each point on l5 are respectively
P(T 0 +T 1 +T 2 ,SKi1),Q(T 0 +T 1 +T 2 +T 3-1 +T 3-2 ,SKi1),R(T 0 +T 1 +T 2 +T 3 ,SKi2)；
During a first period T 3-1 And a second period of time T 3-2 In, the control speed loop keeps a preset ratio coefficient value SKp1 in operation;
in a third period T 3-3 In this case, the scaling factor value of the control speed loop increases linearly from SKp1 to a predetermined scaling factor value SKp2 during operation.
At T 3-3 The ratio coefficient value of the speed ring at the time x in the period is
SKp X ＝(Freq X -F Start )*(SKp2-SKp1)/(F Max -F Start )+SKp1，
Wherein Freqx is the motor frequency at time x, F Start Is (T) 0 +T 1 +T 2 +T 3-1 +T 3-2 ) Time of motor frequency, F Max Is (T) 0 +T 1 +T 2 +T 3 ) Motor frequency at time.
The control speed ring operates based on corresponding preset ratio coefficient values in different time periods in the starting process of the variable frequency compressor, so that the speed setting value and the speed feedback value difference value of each time period in the starting process can be quickly adjusted, the speed of the variable frequency compressor can be timely and accurately adjusted, and the starting process of the variable frequency compressor can be accurately controlled.
During a first period T 3-1 And a second period of time T 3-2 In, the control speed loop keeps a preset integral coefficient value SKi1 in operation;
in a third period T 3-3 In this case, the integral value of the control speed loop increases linearly from SKi1 to a predetermined integral value SKi2 during operation.
The control speed loop operates based on the corresponding preset integral coefficient value in different time periods in the starting process of the variable frequency compressor, so that the speed set value and the difference value of the speed feedback value in each time period in the starting process can be adjusted stably, the speed of the variable frequency compressor can be adjusted stably and accurately, and the stable control of the starting process of the variable frequency compressor can be realized.
As shown in fig. 7, l6 represents the proportional coefficient value versus time curve of the position phase locked loop, l7 represents the integral coefficient value versus time curve of the position phase locked loop,
the coordinates of each point on l6 are respectively
S(T 0 +T 1 +T 2 ,PKp1),T(T 0 +T 1 +T 2 +T 3-1 +T 3-2 ,PKp1),U(T 0 +T 1 +T 2 +T 3 ,PKp2)；
The coordinates of each point on l7 are respectively
V(T 0 +T 1 +T 2 ,PKi1),W(T 0 +T 1 +T 2 +T 3-1 +T 3-2 ,PKi1),X(T 0 +T 1 +T 2 +T 3 ,PKi2)。
During a first period T 3-1 And a second period of time T 3-2 In, the control position phase-locked loop maintains a preset proportional coefficient value PKp1 during operation;
in a third period T 3-3 In this case, the proportional coefficient value of the control position phase-locked loop is linearly reduced from PKp1 to a predetermined proportional coefficient value PKp during operation.
The control position phase-locked loop operates based on corresponding preset proportional coefficient values in different time periods in the starting process of the variable frequency compressor, so that the difference value between the position set value and the position feedback value of each time period in the starting process can be quickly adjusted, the position of the rotor can be timely and accurately adjusted, and the accurate control of the starting process of the variable frequency compressor can be realized.
During a first period T 3-1 And a second period of time T 3-2 In the control position phase-locked loop keeps a preset integral coefficient value PKi1 in operation;
in a third period T 3-3 In, the integral coefficient value of the control position phase-locked loop is runningThe integral coefficient value PKi2 is linearly increased from PKi1 to a preset integral coefficient value PKi2.
The control position phase-locked loop operates based on the corresponding preset integral coefficient value in different time periods in the starting process of the variable frequency compressor, so that the adjustment of the difference value between the position set value and the position feedback value of each time period in the starting process can be stably realized, the position of the rotor can be ensured to be stably and accurately adjusted, and the stable control of the starting process of the variable frequency compressor can be realized.
In some embodiments, the start control method further comprises:
in the open loop stage T 2 First period T 3-1 A second period of time T 3-2 And a third period T 3-3 And regulating and controlling the inductance parameter value of the variable frequency compressor to be a corresponding preset inductance parameter value.
As shown in fig. 8, l8 represents a time-dependent curve of the quadrature-axis inductance parameter value of the inverter compressor, l9 represents a time-dependent curve of the direct-axis inductance parameter value of the inverter compressor,
the coordinates of each point on l8 are respectively
Y(T 0 +T 1 ,Lq1)，Y’(T 0 +T 1 +T 2 +T 3-1 +T 3-2 ,Lq1)，Y”(T 0 +T 1 +T 2 +T 3 ,Lq2)；
The coordinates of each point on l9 are respectively
Z(T 0 +T 1 ,Ld1)，Z’(T 0 +T 1 +T 2 +T 3-1 +T 3-2 ,Ld1)，Z”(T 0 +T 1 +T 2 +T 3 ,Ld2)；
In the open loop stage T 2 First period T 3-1 And a second period of time T 3-2 Regulating and controlling the quadrature axis inductance parameter value of the variable frequency compressor to be a preset quadrature axis inductance parameter value Lq1; for example, lq1 is set to 50% of the corresponding inductance parameter value provided by the compressor manufacturer (this percentage may be adjusted based on experimental results).
In a third period T 3-3 The quadrature axis inductance parameter value of the regulation variable frequency compressor is linearly increased from the quadrature axis inductance parameter value Lq1 to a preset quadrature axis inductance parameter valueLq2; for example, lq2 is set to 100% of the corresponding inductance parameter value provided by the compressor manufacturer (this percentage may be adjusted based on experimental results).
In the open loop stage T 2 First period T 3-1 And a second period of time T 3-2 Regulating and controlling a direct-axis inductance parameter value of the variable-frequency compressor to be a preset direct-axis inductance parameter value Ld1; for example, ld1 is set to 50% of the corresponding inductance parameter value provided by the compressor manufacturer (this percentage may be adjusted based on experimental results).
In a third period T 3-3 Regulating and controlling the linear axis inductance parameter value of the variable frequency compressor to be linearly increased from Ld1 to a preset linear axis inductance parameter value Ld2; for example, ld2 is set to 100% of the corresponding inductance parameter value provided by the compressor manufacturer (this percentage may be adjusted based on experimental results).
Wherein Lq1 > Ld1, lq2 > Ld2.
Through the adjustment to quadrature axis inductance parameter value and direct axis inductance parameter value, can realize the accurate regulation and control to the start-up process of inverter compressor, avoid inverter compressor's start failure.
Another embodiment of the present application provides a start control device of a variable frequency compressor, configured to execute the start control method of the variable frequency compressor according to any one of the foregoing embodiments.
Another embodiment of the present application provides a start control device of a variable frequency compressor, including:
the dividing module is used for dividing the starting process of the variable frequency compressor into a plurality of time periods;
and the control module is used for controlling the current loop, the speed loop and/or the position loop of the vector control system to operate based on preset proportional coefficient values and/or integral coefficient values in each period so as to control the starting process.
Another embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor executes the program to implement the startup control method of the inverter compressor according to any one of the foregoing embodiments.
Another embodiment of the present application provides a computer-readable storage medium having stored thereon a computer program that is executed by a processor to implement the start-up control method of the inverter compressor of any one of the above embodiments.
Another embodiment of the present application provides a refrigeration appliance including a variable frequency compressor and a start control device for controlling any of the above embodiments of the variable frequency compressor or the above electronic device.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the specification and drawings of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (12)
1. A start control method of a variable frequency compressor, comprising:
dividing a starting process of the variable frequency compressor into a plurality of time periods;
during each of said time periods, controlling the current loop, the speed loop and/or the position loop of the vector control system to operate based on preset proportional coefficient values and/or integral coefficient values to control the start-up process;
the current loop, speed loop and/or position loop of the control vector control system operates based on preset proportional coefficient values and/or integral coefficient values, comprising:
controlling the current loop, the speed loop and/or the position loop to operate based on preset proportional coefficient values and/or integral coefficient values respectively in three periods of the whole open loop phase and the closed loop phase;
the three time periods comprise a first time period, a second time period and a third time period which are arranged in time sequence, wherein the first time period is a time period in which the motor frequency of the variable frequency compressor is linearly reduced, the second time period is a time period in which the motor frequency is kept constant, and the third time period is a time period in which the motor frequency is linearly increased; the start-up procedure includes the open loop phase and the closed loop phase;
the controlling of the current loop, the speed loop and/or the position loop to operate based on preset proportional coefficient values and/or integral coefficient values respectively in three periods of the whole open loop phase and the closed loop phase comprises:
in the open loop stage, controlling the current loop to keep a preset first proportional coefficient value in operation;
controlling the current loop to maintain a preset second proportional coefficient value in operation within the first period; wherein the second scaling factor value is at least twice the first scaling factor value;
controlling the current loop to maintain a preset third proportional coefficient value in operation in the second period; the third scale factor value is greater than the first scale factor value and less than the second scale factor value;
and in the third period, controlling the ratio coefficient value of the current loop to be linearly reduced from the third ratio coefficient value to a preset fourth ratio coefficient value in operation.
2. The start-up control method according to claim 1, wherein said controlling of said current loop, said speed loop and/or said position loop operates based on preset proportional and/or integral coefficient values, respectively, throughout three periods of an open loop phase and a closed loop phase, comprising:
controlling the current loop to maintain a preset first integral coefficient value in operation in the open loop stage and the first period;
controlling the current loop to maintain a preset second integral coefficient value in operation in the second period; the second integral coefficient value is greater than the first integral coefficient value;
and during the third period, controlling the current loop to keep the first integral coefficient value in operation.
3. The start-up control method according to claim 1, wherein said controlling of said current loop, said speed loop and/or said position loop operates based on preset proportional and/or integral coefficient values, respectively, throughout three periods of an open loop phase and a closed loop phase, comprising:
controlling the speed loop to maintain a preset fifth ratio coefficient value in operation in the first period and the second period;
and in the third period, controlling the ratio coefficient value of the speed loop to be linearly increased from the fifth ratio coefficient value to a preset sixth ratio coefficient value in operation.
4. The start-up control method according to claim 1, wherein said controlling of said current loop, said speed loop and/or said position loop operates based on preset proportional and/or integral coefficient values, respectively, throughout three periods of an open loop phase and a closed loop phase, comprising:
controlling the speed loop to maintain a preset third integral coefficient value in operation in the first period and the second period;
and in the third period, controlling the integral coefficient value of the speed loop to be linearly increased from the third integral coefficient value to a preset fourth integral coefficient value in operation.
5. The start-up control method according to claim 1, wherein said controlling of said current loop, said speed loop and/or said position loop operates based on preset proportional and/or integral coefficient values, respectively, throughout three periods of an open loop phase and a closed loop phase, comprising:
controlling the position loop to maintain a preset seventh ratio coefficient value in operation in the first period and the second period;
and in the third period, controlling the ratio coefficient value of the position ring to be linearly reduced to a preset eighth ratio coefficient value from the seventh ratio coefficient value in operation.
6. The start-up control method according to claim 1, wherein said controlling of said current loop, said speed loop and/or said position loop operates based on preset proportional and/or integral coefficient values, respectively, throughout three periods of an open loop phase and a closed loop phase, comprising:
controlling the position loop to keep a preset fifth integral coefficient value in operation in the first period and the second period;
and in the third period, controlling the integral coefficient value of the position ring to be linearly increased from the fifth integral coefficient value to a preset sixth integral coefficient value in operation.
7. The startup control method according to claim 1, characterized in that the startup control method further comprises:
and in the open loop stage, the first period, the second period and the third period, regulating and controlling the inductance parameter value of the variable frequency compressor to be a preset inductance parameter value.
8. The startup control method of claim 7, wherein said adjusting the inductance parameter value of the inverter compressor to a preset inductance parameter value during the open loop phase, the first period, the second period, and the third period comprises:
in the open loop stage, the first period and the second period, adjusting and controlling the quadrature axis inductance parameter value of the variable frequency compressor to be a preset first quadrature axis inductance parameter value;
in the third period, regulating and controlling the quadrature axis inductance parameter value of the variable frequency compressor to be linearly increased from the first quadrature axis inductance parameter value to a preset second quadrature axis inductance parameter value;
in the open loop stage, the first period and the second period, regulating and controlling the direct-axis inductance parameter value of the variable frequency compressor to be a preset first direct-axis inductance parameter value;
in the third period, regulating and controlling the direct-axis inductance parameter value of the variable frequency compressor to be linearly increased from the first direct-axis inductance parameter value to a preset second direct-axis inductance parameter value;
the first quadrature axis inductance parameter value is greater than the first direct axis inductance parameter value, and the second quadrature axis inductance parameter value is greater than the second direct axis inductance parameter value.
9. A start control device of a variable frequency compressor, comprising:
the dividing module is used for dividing the starting process of the variable frequency compressor into a plurality of time periods;
the control module is used for controlling the current loop, the speed loop and/or the position loop of the vector control system to operate based on preset proportional coefficient values and/or integral coefficient values in each time period so as to control the starting process;
the control module is further configured to control the current loop, the speed loop, and/or the position loop to operate based on preset proportional coefficient values and/or integral coefficient values, respectively, throughout three periods of the open loop phase and the closed loop phase;
the three time periods comprise a first time period, a second time period and a third time period which are arranged in time sequence, wherein the first time period is a time period in which the motor frequency of the variable frequency compressor is linearly reduced, the second time period is a time period in which the motor frequency is kept constant, and the third time period is a time period in which the motor frequency is linearly increased; the start-up procedure includes the open loop phase and the closed loop phase;
the control module is further to:
in the open loop stage, controlling the current loop to keep a preset first proportional coefficient value in operation;
controlling the current loop to maintain a preset second proportional coefficient value in operation within the first period; wherein the second scaling factor value is at least twice the first scaling factor value;
controlling the current loop to maintain a preset third proportional coefficient value in operation in the second period; the third scale factor value is greater than the first scale factor value and less than the second scale factor value;
and in the third period, controlling the ratio coefficient value of the current loop to be linearly reduced from the third ratio coefficient value to a preset fourth ratio coefficient value in operation.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the method of controlling the start-up of a variable frequency compressor according to any one of claims 1-8.
11. A computer-readable storage medium having stored thereon a computer program, characterized in that the program is executed by a processor to realize the start-up control method of a variable frequency compressor according to any one of claims 1 to 8.
12. A refrigeration apparatus comprising a variable frequency compressor and the start control device of claim 9 or the electronic apparatus of claim 10 for controlling the variable frequency compressor.
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