CN108347211B - Motor reactive compensation system and method - Google Patents
Motor reactive compensation system and method Download PDFInfo
- Publication number
- CN108347211B CN108347211B CN201710055318.3A CN201710055318A CN108347211B CN 108347211 B CN108347211 B CN 108347211B CN 201710055318 A CN201710055318 A CN 201710055318A CN 108347211 B CN108347211 B CN 108347211B
- Authority
- CN
- China
- Prior art keywords
- motor
- switch
- reactive
- reactive power
- power compensation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention provides a reactive power compensation system and a method for a motor, wherein the reactive power compensation system for the motor comprises at least one reactive power compensation unit, each reactive power compensation unit is respectively used for providing reactive power compensation for a group of asynchronous motors which are mutually standby, and each reactive power compensation unit comprises a reactive power compensation device, a main switch and two fling-cut switches; the two switching switches are respectively a first switch and a second switch; each group of mutually standby asynchronous motors comprises a first motor and a second motor; one end of the first switch and one end of the second switch are both connected with the main switch; the other end of the first switch is connected to a bus connected with the first motor, and the other end of the second switch is connected to a bus connected with the second motor; when the first switch is closed, the reactive power compensation device provides reactive power compensation for the first motor; when the second switch is closed, the reactive power compensation device provides reactive power compensation for the second motor. The system provided by the invention can solve the problems of low utilization rate and large equipment investment of the existing reactive power compensation device.
Description
Technical Field
The invention relates to the field of electromechanical protection, in particular to a reactive power compensation system and method for a motor.
Background
In a factory, one load device is generally provided with two sets of power equipment, one set of equipment runs with the load device, the other set of equipment is standby, and when the running power equipment breaks down or is overhauled, the standby power equipment continues to work with the load device, so that the continuous running of the load is ensured.
In general, two sets of power equipment have the same model and parameters and are mutually standby. Each set of power equipment is provided with a set of reactive compensation system, and the power factor of the equipment is improved through reactive compensation, so that the load capacity is enhanced. When the power equipment runs, the reactive compensation system generates reactive power; when the power equipment stops working, the reactive power compensation system also stops working and does not send out reactive power any more. The traditional method enables the utilization rate of the reactive compensation system to be low and the equipment investment to be large.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a reactive power compensation system and a reactive power compensation method for a motor, and aims to solve the problems that the existing reactive power compensation device is low in utilization rate and large in equipment investment.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides a reactive compensation system for an electric machine, the reactive compensation system for an electric machine comprising at least one reactive compensation unit, each reactive compensation unit being configured to provide reactive compensation for a group of asynchronous machines which are mutually standby, each reactive compensation unit comprising: the reactive power compensation device comprises a reactive power compensation device, a main switch and two fling-cut switches; the two switching switches are respectively a first switch and a second switch; the group of asynchronous motors which are mutually standby comprises a first motor and a second motor;
one end of the main switch is connected with the first switch and the second switch respectively; the other end is connected with a reactive power compensation device; the main switch is used for controlling the working state of the reactive compensation unit; when the reactive compensation unit works normally, the main switch is closed;
one end of each of the first switch and the second switch is connected with the main switch; the other end of the first switch is connected to a bus connected with a first motor, and the other end of the second switch is connected to a bus connected with a second motor;
the first switch and the second switch are two linked switches with opposite actions, when the first switch is closed according to the running condition of the first motor, the second switch is automatically switched off, and the reactive power compensation device provides reactive power compensation for the first motor; when the second switch is closed according to the running condition of the second motor, the first switch is automatically switched off, and the reactive power compensation device provides reactive power compensation for the second motor.
Preferably, the reactive compensation unit further includes:
the control device is respectively connected with the first switch and the second switch;
the control device is respectively communicated with a first comprehensive protection device of the first motor and a second comprehensive protection device of the second motor through optical cables or wirelessly;
the control device is used for controlling the first switch or the second switch to be closed according to a closing indication signal sent by the first comprehensive protection device or the second comprehensive protection device;
wherein the closing indication signal is sent by the first or second integrated protection device when detecting the start of the corresponding motor.
Preferably, the closing indication signal is sent to the control device by the first comprehensive protection device or the second comprehensive protection device when the starting current of the corresponding motor is detected to be reduced to the rated current of the corresponding motor.
Preferably, for each reactive compensation unit, the first switch communicates with the first comprehensive protection device of the first motor through an optical cable or wirelessly, and the second switch communicates with the second comprehensive protection device of the second motor through an optical cable or wirelessly;
the first switch and the second switch are used for being closed according to a closing indication signal sent by the first comprehensive protection device or the second comprehensive protection device;
wherein the closing indication signal is sent by the first or second integrated protection device when detecting the start of the corresponding motor.
Preferably, the closing indication signal is a signal sent by the first and second integrated protection devices to the corresponding connected switch when detecting that the starting current of the corresponding motor is reduced to the rated current of the corresponding motor.
Preferably, the first motor and the second motor in each group of mutually standby asynchronous motors are connected to different buses;
correspondingly, when the first switch is closed, the reactive power compensation device is connected to a bus corresponding to the first motor to provide reactive power compensation for the first motor;
when the second switch is closed, the reactive power compensation device is connected to a bus corresponding to the second motor, and reactive power compensation is provided for the second motor.
Preferably, a first motor of the plurality of groups of asynchronous motors is connected to the first bus bar, and a second motor of the plurality of groups of asynchronous motors is connected to the second bus bar.
In a second aspect, the present invention also provides a reactive power compensation method for an electric motor based on any one of the above systems, including:
if it is determined that a first motor in a certain group of asynchronous motors which are mutually standby needs to provide reactive compensation, controlling a first switch in a reactive compensation unit corresponding to the group of asynchronous motors to be closed, so that a reactive compensation device in the corresponding reactive compensation unit provides reactive compensation for the first motor;
and if the second motor in a certain group of asynchronous motors which are mutually standby is determined to need to provide reactive compensation, controlling a second switch in a reactive compensation unit corresponding to the group of asynchronous motors to be closed, so that a reactive compensation device in the corresponding reactive compensation unit provides reactive compensation for the second motor.
According to the technical scheme, in the reactive power compensation system of the motor, any two motors which are standby for each other can share one reactive power compensation device, so that the two reactive power compensation devices are not needed to respectively compensate the two motors which are standby for each other, and the reactive power compensation devices can be controlled to provide reactive power compensation for the first motor or the second motor which is working according to needs. Therefore, compared with single-machine independent compensation in the existing application, the method improves the utilization rate of the reactive power compensation device, saves the equipment investment cost and is easy to maintain and manage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a reactive power compensation system of a motor according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a reactive power compensation system of a motor according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a reactive power compensation system of a motor according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a reactive power compensation system of a motor according to a fourth embodiment of the present invention;
fig. 5 is a flowchart of a reactive power compensation method for a motor according to a fifth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "connected" or "connected" in the following embodiments include both direct connection and indirect connection.
In a first embodiment of the invention, a reactive compensation system for an electric machine is provided, in which the reactive compensation system comprises a reactive compensation unit for providing reactive compensation for a group of asynchronous machines standing by for each other. Fig. 1 shows a schematic structural diagram of a reactive power compensation system of a motor according to a first embodiment of the present invention. The part shown in the larger dotted line frame is a structural schematic diagram of a reactive power compensation unit of the motor, and the part shown in the smaller dotted line frame is a structural schematic diagram of a reactive power compensation device.
Referring to fig. 1, the reactive power compensation system of the motor provided in this embodiment includes a reactive power compensation unit (shown in a larger dashed box in fig. 1) for providing reactive power compensation for a group of two asynchronous motors which are standby for each other, and the reactive power compensation unit of the motor includes: the reactive power compensation device comprises a reactive power compensation device, a main switch KM and two fling-cut switches; the two switching switches are respectively a first switch KM1 and a second switch KM 2; here, a group of asynchronous motors, which are backed up with each other, includes a first motor M1 and a second motor M2. The reactive power compensation device is shown in a smaller dashed box in fig. 1.
One end of the main switch is connected with the first switch and the second switch respectively; the other end is connected with a reactive power compensation device; the main switch is used for controlling the working state of the reactive compensation unit; and when the reactive compensation unit works normally, the main switch is closed.
One ends of the first switch KM1 and the second switch KM2 are both connected with the main switch KM; the other end of the first switch KM1 is connected to a bus connected with a first motor M1, and the other end of the second switch KM2 is connected to a bus connected with a second motor M2;
wherein the first switch KM1 and the second switch KM2 are two ganged switches with opposite actions, when the first switch KM1 is closed according to the operation condition of the first motor M1 (such as when the first motor is started and the starting current is reduced to the rated current of the first motor), the second switch KM2 is automatically opened, and the reactive power compensation device provides reactive power compensation for the first motor M1; when the second switch KM2 is closed according to the operating condition of the second motor M2 (e.g., when the second motor is started and the starting current drops to the rated current of the second motor), the first switch KM1 is automatically opened, and the reactive power compensation device provides reactive power compensation for the second motor M2.
In this embodiment, the first switch KM1 and the second switch KM2 are two ganged switches with opposite actions, that is, when the first switch KM1 is closed, the second switch KM2 is automatically opened; when the second switch KM2 is closed, the first switch KM1 is automatically opened. Thus, only by controlling the first switch KM1 or the second switch KM2 to be closed as required, the other switch is automatically opened.
In this embodiment, the first motor M1 and the second motor M2 are two asynchronous motors which are standby for each other, that is, the first motor and the second motor do not work simultaneously, that is, when the first motor is in a working state, the second motor is in a standby state, and when the second motor is in a working state, the first motor is in a standby state.
The reactive power compensation device mentioned in the embodiment of the present invention is a reactive power compensation device in the prior art, and since the reactive power compensation device itself is not improved in this embodiment, the reactive power compensation device is not described herein again.
As can be seen from the above description, in this embodiment, any two motors which are standby for each other may share one reactive power compensation device, so that two reactive power compensation devices are not required to compensate for the two motors which are standby for each other separately, and the reactive power compensation devices may be controlled to provide reactive power compensation for the first motor or the second motor which is operating according to the requirement. Therefore, compared with the single-machine independent compensation in the existing application (namely, each of the two motors which are mutually standby is provided with one reactive compensation device for independent compensation), the mode improves the utilization rate of the reactive compensation device, saves the equipment investment cost and is easy to maintain and manage.
Preferably, referring to fig. 1, the first motor M1 and the second motor M2 are connected to different buses; referring to fig. 1, the first motor M1 is connected to the bus I, and the second motor M2 is connected to the bus II.
When the first switch KM1 is closed, the reactive compensation device is connected to a bus I corresponding to the first motor M1 to provide reactive compensation for the first motor M1;
when the second switch KM2 is closed, the reactive compensation device is connected to the bus II corresponding to the second electric machine M2, so as to provide reactive compensation for the second electric machine M2.
The first motor M1 and the second motor M2 are connected to different buses so that reactive compensation devices can be connected to different buses to provide reactive compensation for different motors.
In a second embodiment of the present invention, referring to fig. 2, a difference from the first embodiment is that the reactive power compensation system of the motor provided in this embodiment includes N (N ≧ 2) reactive power compensation units, each of the reactive power compensation units is respectively configured to provide reactive power compensation for a group of asynchronous motors (M1 and M2) that are mutually standby, and each of the reactive power compensation units includes: a reactive compensation device, a main switch (KM) and two switching switches (KM1 and KM 2); here, M1 and M2 only indicate two asynchronous motors in each group that are in backup with each other, and do not particularly denote a certain motor. Similarly, only two ganged switches with opposite actions in each reactive compensation unit are shown for KM1 and KM2, and a switch is not specifically designated.
In the present embodiment, each reactive compensation unit corresponds to reactive compensation of a group of asynchronous motors which are mutually standby. Each reactive compensation unit independently provides reactive compensation for a corresponding set of asynchronous machines.
Preferably, in order to further simplify the structure and facilitate the wiring, referring to fig. 2, first motors of the N groups of mutually standby asynchronous motors are all connected to the first bus bar, and second motors of the N groups of mutually standby asynchronous motors are all connected to the second bus bar. For each set of mutually redundant asynchronous machines, the first machine M1 and the second machine M2 are connected to the first bus I and the second bus II, respectively, so that the reactive compensation devices in each reactive compensation unit can be connected to different buses to provide reactive compensation for different machines.
When the first switch KM1 in a certain reactive compensation unit is closed, the reactive compensation device in the reactive compensation unit is connected to the bus I corresponding to the first motor M1 to provide reactive compensation for the corresponding first motor M1; when the second switch KM2 in a certain reactive compensation unit is closed, the reactive compensation device in the reactive compensation unit is connected to the bus II corresponding to the second motor M2, so as to provide reactive compensation for the corresponding second motor M2.
For example, when there are multiple groups of asynchronous motors in a certain working system, the reactive compensation units corresponding to each group of asynchronous motors may be separately arranged, the first switch KM1 in each reactive compensation unit is connected to the first bus I, and the second switch KM2 in each reactive compensation unit is connected to the second bus II, and since the first motor in each group of asynchronous single machines is connected to the first bus I through the circuit breaker k1, and the second motor in each group of asynchronous single machines is connected to the second bus II through the circuit breaker k2, the reactive compensation device of each reactive compensation unit can independently provide reactive compensation for the working motor in the corresponding group of asynchronous motors.
In a third embodiment of the present invention, referring to fig. 3, for convenience of description, the present embodiment is explained by taking a reactive compensation system of a motor, which only includes one reactive compensation unit, as an example. Of course, for the reactive power compensation system of the motor including a plurality of reactive power compensation units, the structure of each reactive power compensation unit is similar to that of the reactive power compensation unit in this embodiment, and details are not described here (the same reason is also true for the fourth embodiment).
In this embodiment, based on the first embodiment, the reactive compensation unit further includes:
a control device connected to the first switch KM1 and the second switch KM2, respectively;
the control device is respectively communicated with a first comprehensive protection device of the first motor M1 and a second comprehensive protection device of the second motor M2 through optical cables or wirelessly;
the control device is used for controlling the first switch KM1 or the second switch KM2 to close according to a closing indication signal sent by the first integrated protection device or the second integrated protection device;
wherein the closing indication signal is sent by the first or second integrated protection device when detecting the start of the corresponding motor.
Wherein, k1 and k2 in fig. 1-4 are motor circuit breakers, and the specific use principle of the circuit breaker is well known to those skilled in the art, and the circuit breaker provided herein does not affect the understanding of the inventive point of the present invention, and therefore the working principle of the circuit breaker is not described herein again.
In this embodiment, when the first or second integrated protection device detects that the corresponding motor is started, the first or second integrated protection device sends a close indication signal to the first or second switch through the control device, so that the first switch or the second switch is closed, and the reactive power compensation device provides reactive power compensation for the first motor or the second motor which is working.
Preferably, the closing indication signal is sent to the control device by the first comprehensive protection device or the second comprehensive protection device when the starting current of the corresponding motor is detected to be reduced to the rated current of the corresponding motor. Here, the reactive compensation device is particularly required to provide reactive compensation when the starting current at the start of the electric machine drops to the rated current of the electric machine, so that preferably the closing indication signal is sent by the first or second integrated protection device to the control device upon detection of a drop in the starting current of the corresponding electric machine to the rated current of the corresponding electric machine.
Here, the first or second integrated protection device is a common integrated protection device for an electric motor, which has the function of detecting whether the corresponding electric motor is started and starting a specific state of current.
In this embodiment, the control device controls the first switch or the second switch to be closed according to a closing indication signal sent by the first integrated protection device or the second integrated protection device, so that the reactive power compensation device provides reactive power compensation for the corresponding motor. The closing indication signal is sent by the first comprehensive protection device or the second comprehensive protection device when the corresponding motor is detected to be started, namely when the first motor or the second motor is started, the first comprehensive protection device or the second comprehensive protection device controls the first switch or the second switch to be closed through the control device, and therefore the reactive power compensation device provides reactive power compensation for the motor which is working.
In a fourth embodiment of the present invention, referring to fig. 4, unlike the second embodiment described above, in this embodiment, for each reactive compensation unit, the first switch KM1 communicates with the first integrated protection device of the first motor M1 via optical cable or wirelessly, and the second switch KM2 communicates with the second integrated protection device of the second motor M2 via optical cable or wirelessly; the first switch KM1 and the second switch KM2 are configured to close according to a close indication signal transmitted by the first integrated protection device or the second integrated protection device. Wherein the closing indication signal is sent by the first or second integrated protection device when detecting the start of the corresponding motor.
In this embodiment, when detecting that the corresponding motor is started, the first or second integrated protection device sends a close indication signal to the first or second switch, so that the first switch or the second switch is closed, and the reactive power compensation device provides reactive power compensation for the first motor or the second motor which is working.
Preferably, the closing indication signal is sent to the control device by the first comprehensive protection device or the second comprehensive protection device when the starting current of the corresponding motor is detected to be reduced to the rated current of the corresponding motor. Here, the reactive compensation device is particularly required to provide reactive compensation when the starting current at the start of the electric machine drops to the rated current of the electric machine, so that preferably the closing indication signal is sent by the first or second integrated protection device to the control device upon detection of a drop in the starting current of the corresponding electric machine to the rated current of the corresponding electric machine.
In this embodiment, the first switch KM1 is in communication with the first integrated protection device of the first motor M1 through an optical cable or wirelessly, and the second switch KM2 is in communication with the second integrated protection device of the second motor M2 through an optical cable or wirelessly, so that the first switch KM1 and the second switch KM2 can be closed according to a closing indication signal sent by the first integrated protection device or the second integrated protection device, and further, the reactive power compensation device provides reactive power compensation for the corresponding motor. The closing indication signal is sent by the first comprehensive protection device or the second comprehensive protection device when the corresponding motor is detected to be started, namely when the first motor or the second motor is started, the first comprehensive protection device or the second comprehensive protection device controls the first switch or the second switch to be closed through the control device, and therefore the reactive power compensation device provides reactive power compensation for the motor which is working.
A fifth embodiment of the present invention provides a reactive power compensation method for a motor based on the reactive power compensation system of the motor described in any of the above embodiments, referring to fig. 5, the method includes the following steps:
step 101: and if the first motor in a certain group of asynchronous motors which are mutually standby is determined to need to provide reactive compensation, controlling a first switch in a reactive compensation unit corresponding to the group of asynchronous motors to be closed, so that a reactive compensation device in the corresponding reactive compensation unit provides reactive compensation for the first motor.
Step 102: and if the second motor in a certain group of asynchronous motors which are mutually standby is determined to need to provide reactive compensation, controlling a second switch in a reactive compensation unit corresponding to the group of asynchronous motors to be closed, so that a reactive compensation device in the corresponding reactive compensation unit provides reactive compensation for the second motor.
In the reactive power compensation method for the motor provided in this embodiment, when it is determined that a first motor in a certain group of asynchronous motors that are standby to each other needs to provide reactive power compensation, a first switch in a reactive power compensation unit corresponding to the group of asynchronous motors is controlled to be closed, so that a reactive power compensation device in the corresponding reactive power compensation unit provides reactive power compensation for the first motor; when it is determined that a second motor in a group of asynchronous motors which are mutually standby needs to provide reactive compensation, a second switch in a reactive compensation unit corresponding to the group of asynchronous motors is controlled to be closed, so that reactive compensation devices in the corresponding reactive compensation units provide reactive compensation for the second motor. Because the first motor and the second motor in each group of asynchronous motors are two motors which are mutually standby, and the first switch and the second switch in each reactive compensation unit are linked switches with opposite actions, the embodiment can realize the working mode that any two motors which are mutually standby share one reactive compensation device, so that the two motors which are mutually standby are not required to be respectively compensated by the two reactive compensation devices, and the reactive compensation devices can be controlled to provide reactive compensation for the first motor or the second motor which is working according to the requirement. Therefore, compared with single-machine independent compensation in the existing application, the method improves the utilization rate of the reactive power compensation device, saves the equipment investment cost and is easy to maintain and manage.
Preferably, before the step 101, the method further comprises: step 100.
Step 100: judging whether a first motor in a certain group of asynchronous motors which are mutually standby needs to provide reactive compensation or not, if so, controlling a first switch in a reactive compensation unit corresponding to the group of asynchronous motors to be closed, and enabling a reactive compensation device in the corresponding reactive compensation unit to provide reactive compensation for the first motor; otherwise, controlling a second switch in a reactive compensation unit corresponding to the group of asynchronous motors to be closed, so that a reactive compensation device in the corresponding reactive compensation unit provides reactive compensation for the second motor;
or the like, or, alternatively,
judging whether a second motor in a certain group of asynchronous motors which are mutually standby needs to provide reactive compensation, if so, controlling a second switch in a reactive compensation unit corresponding to the group of asynchronous motors to be closed, and enabling a reactive compensation device in the corresponding reactive compensation unit to provide reactive compensation for the second motor; otherwise, controlling a first switch in a reactive compensation unit corresponding to the group of asynchronous motors to be closed, so that a reactive compensation device in the corresponding reactive compensation unit provides reactive compensation for the first motor.
Preferably, for each reactive compensation unit, the first switch communicates with the first comprehensive protection device of the first motor through an optical cable or wirelessly, and the second switch communicates with the second comprehensive protection device of the second motor through an optical cable or wirelessly;
correspondingly, the determining whether a first motor in a group of asynchronous motors that are standby for each other needs to provide reactive compensation specifically includes:
judging whether a first comprehensive protection device of a first motor in a group of mutually standby asynchronous motors detects that the first motor is started and the starting current is reduced to the rated current of the first motor, if so, controlling a first switch to be closed so that a reactive compensation device in the corresponding reactive compensation unit provides reactive compensation for the first motor;
correspondingly, the determining whether a second motor in a group of asynchronous motors that are standby for each other needs to provide reactive compensation specifically includes:
and judging whether a second comprehensive protection device of a second motor in a group of mutually standby asynchronous motors detects that the second motor is started and the starting current is reduced to the rated current of the second motor, if so, controlling a second switch to be closed, and enabling the reactive compensation device in the corresponding reactive compensation unit to provide reactive compensation for the second motor.
Preferably, the first motor and said second motor of the same set of asynchronous motors are connected to different buses. Furthermore, the first motors in different groups of asynchronous motors are connected to the first bus bar, and the second motors are connected to the second bus bar.
The working principle and the beneficial effect of the method described in this embodiment are similar to those of the method described in the above embodiment, and are not described again here.
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A reactive compensation system for an electric machine, the reactive compensation system comprising at least one reactive compensation unit, each reactive compensation unit being adapted to provide reactive compensation for a group of asynchronous machines in mutual standby, each reactive compensation unit comprising: the reactive power compensation device comprises a reactive power compensation device, a main switch and two fling-cut switches; the two switching switches are respectively a first switch and a second switch; the group of asynchronous motors which are mutually standby comprises a first motor and a second motor;
one end of the main switch is connected with the first switch and the second switch respectively; the other end is connected with a reactive power compensation device; the main switch is used for controlling the working state of the reactive compensation unit; when the reactive compensation unit works normally, the main switch is closed;
one end of each of the first switch and the second switch is connected with the main switch; the other end of the first switch is connected to a bus connected with a first motor, and the other end of the second switch is connected to a bus connected with a second motor;
the first switch and the second switch are two linked switches with opposite actions, when the first switch is closed according to the running condition of the first motor, the second switch is automatically switched off, and the reactive power compensation device provides reactive power compensation for the first motor; when the second switch is closed according to the running condition of a second motor, the first switch is automatically switched off, and the reactive power compensation device provides reactive power compensation for the second motor;
wherein the reactive compensation unit further comprises:
the control device is respectively connected with the first switch and the second switch;
the control device is respectively communicated with a first comprehensive protection device of the first motor and a second comprehensive protection device of the second motor through optical cables or wirelessly;
the control device is used for controlling the first switch or the second switch to be closed according to a closing indication signal sent by the first comprehensive protection device or the second comprehensive protection device;
wherein the closing indication signal is sent by the first or second integrated protection device when detecting the start of the corresponding motor.
2. The system of claim 1, wherein the close indication signal is sent by the first or second integrated protection devices to the control device upon detecting that the corresponding motor starting current has dropped to the rated current of the corresponding motor.
3. The system according to claim 1, characterized in that for each reactive compensation unit, the first switch communicates with the first integrated protection device of the first electric machine by means of optical cables or wirelessly, and the second switch communicates with the second integrated protection device of the second electric machine by means of optical cables or wirelessly;
the first switch and the second switch are used for being closed according to a closing indication signal sent by the first comprehensive protection device or the second comprehensive protection device;
wherein the closing indication signal is sent by the first or second integrated protection device when detecting the start of the corresponding motor.
4. The system according to claim 3, characterized in that the closure indication signal is a signal sent by the first and second integrated protection devices to the corresponding connected switch upon detection of a drop of the starting current of the corresponding motor to the rated current of the corresponding motor.
5. A system according to any one of claims 1 to 4, wherein the first and second motors of each set of mutually redundant asynchronous motors are connected to different buses;
correspondingly, when the first switch is closed, the reactive power compensation device is connected to a bus corresponding to the first motor to provide reactive power compensation for the first motor;
when the second switch is closed, the reactive power compensation device is connected to a bus corresponding to the second motor, and reactive power compensation is provided for the second motor.
6. The system of claim 5 wherein a first motor of the plurality of sets of asynchronous motors is connected to a first bus and a second motor of the plurality of sets of asynchronous motors is connected to a second bus.
7. A motor reactive power compensation method based on the system of any one of claims 1-6, characterized by comprising the following steps:
if it is determined that a first motor in a certain group of asynchronous motors which are mutually standby needs to provide reactive compensation, controlling a first switch in a reactive compensation unit corresponding to the group of asynchronous motors to be closed, so that a reactive compensation device in the corresponding reactive compensation unit provides reactive compensation for the first motor;
and if the second motor in a certain group of asynchronous motors which are mutually standby is determined to need to provide reactive compensation, controlling a second switch in a reactive compensation unit corresponding to the group of asynchronous motors to be closed, so that a reactive compensation device in the corresponding reactive compensation unit provides reactive compensation for the second motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710055318.3A CN108347211B (en) | 2017-01-24 | 2017-01-24 | Motor reactive compensation system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710055318.3A CN108347211B (en) | 2017-01-24 | 2017-01-24 | Motor reactive compensation system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108347211A CN108347211A (en) | 2018-07-31 |
| CN108347211B true CN108347211B (en) | 2020-09-11 |
Family
ID=62963021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710055318.3A Active CN108347211B (en) | 2017-01-24 | 2017-01-24 | Motor reactive compensation system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108347211B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07107671A (en) * | 1993-10-06 | 1995-04-21 | Meidensha Corp | Automatic power-factor controlling method |
| JP2003079053A (en) * | 2001-08-31 | 2003-03-14 | Meidensha Corp | Power factor improvement device |
| CN201243204Y (en) * | 2008-08-22 | 2009-05-20 | 西安宝美电气工业有限公司 | Special reactive compensation and harmonic suppression device for electric drill |
| CN101826728A (en) * | 2009-03-05 | 2010-09-08 | 山西太钢不锈钢股份有限公司 | Dynamic reactive power compensation device and control method thereof |
| CN101964530A (en) * | 2010-11-01 | 2011-02-02 | 河南省电机工程学会技术咨询服务部 | Novel low-voltage distribution transformer reactive power compensation device |
| CN102354994A (en) * | 2011-10-09 | 2012-02-15 | 国船电气（武汉）有限公司 | MCR (magnetically controlled reactor) soft start and SVC (static VAR compensator) dynamic reactive compensation device as well as soft start and dynamic reactive compensation method |
| CN102364802A (en) * | 2011-11-11 | 2012-02-29 | 安徽禾田电气有限公司 | Reactive power terminal compensation energy-saving device for three-phase low-voltage asynchronous motor |
| CN202231653U (en) * | 2011-10-09 | 2012-05-23 | 国船电气（武汉）有限公司 | Combined switch used for MCR dynamic reactive compensation and motor soft start |
| CN106169761A (en) * | 2016-06-24 | 2016-11-30 | 广州开能电气实业有限公司 | Multiplexed-capacitor group switching module |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070279015A1 (en) * | 2006-06-05 | 2007-12-06 | Livingston Francis X | Integrated power factor correction capacitance unit |
-
2017
- 2017-01-24 CN CN201710055318.3A patent/CN108347211B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07107671A (en) * | 1993-10-06 | 1995-04-21 | Meidensha Corp | Automatic power-factor controlling method |
| JP2003079053A (en) * | 2001-08-31 | 2003-03-14 | Meidensha Corp | Power factor improvement device |
| CN201243204Y (en) * | 2008-08-22 | 2009-05-20 | 西安宝美电气工业有限公司 | Special reactive compensation and harmonic suppression device for electric drill |
| CN101826728A (en) * | 2009-03-05 | 2010-09-08 | 山西太钢不锈钢股份有限公司 | Dynamic reactive power compensation device and control method thereof |
| CN101964530A (en) * | 2010-11-01 | 2011-02-02 | 河南省电机工程学会技术咨询服务部 | Novel low-voltage distribution transformer reactive power compensation device |
| CN102354994A (en) * | 2011-10-09 | 2012-02-15 | 国船电气（武汉）有限公司 | MCR (magnetically controlled reactor) soft start and SVC (static VAR compensator) dynamic reactive compensation device as well as soft start and dynamic reactive compensation method |
| CN202231653U (en) * | 2011-10-09 | 2012-05-23 | 国船电气（武汉）有限公司 | Combined switch used for MCR dynamic reactive compensation and motor soft start |
| CN102364802A (en) * | 2011-11-11 | 2012-02-29 | 安徽禾田电气有限公司 | Reactive power terminal compensation energy-saving device for three-phase low-voltage asynchronous motor |
| CN106169761A (en) * | 2016-06-24 | 2016-11-30 | 广州开能电气实业有限公司 | Multiplexed-capacitor group switching module |
Non-Patent Citations (1)
| Title |
|---|
| 石化企业电网无功补偿分析;李琼;《当代化工》;20160831;第45卷(第8期);第2003-2005页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108347211A (en) | 2018-07-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104362654B (en) | Three-phase equilibrium electric power system and method and the modularization power distribution cabinet provided with the system | |
| CN105406580B (en) | A kind of electric power system and method | |
| US20170005510A1 (en) | Maintenance transfer switch | |
| CN201533194U (en) | Automatic on/off switching electric appliance | |
| CN104599901A (en) | Detection circuit used for contactor | |
| CN109638809B (en) | Low-voltage direct-current expansion power supply system and method for long marshalling train | |
| EP2798721B1 (en) | System and method for maintaining proper phase neutral wiring in a power system | |
| JP2021536217A (en) | Power supply device and power supply system | |
| JP2002044869A (en) | Power conversion device | |
| CN108347211B (en) | Motor reactive compensation system and method | |
| CN106353646A (en) | Insulation detection and control method based on high-voltage DC power supply system | |
| KR101050202B1 (en) | Emergency lighting control circuit and its control method | |
| KR101430577B1 (en) | Voltage sag protector for three phase servo driver | |
| CN111319747A (en) | Ship direct-current networking management control system based on industrial Ethernet ring and power management method thereof | |
| JP2009124911A (en) | Power-feeding controller | |
| CN105932927A (en) | Automatic control device for AC power phase sequence of air compressor | |
| CN102832700A (en) | Power supply device with multi-power input and power supply method thereof | |
| KR20120086973A (en) | motor controlling board and auto controlling board with neutral line replacement and method thereof | |
| CN211470419U (en) | Redundant intelligent control system of double control cabinet | |
| CN115280630A (en) | Conversion device, retrofit kit and method for supplying power to a load | |
| JP2022500981A (en) | Power supply device and power supply system | |
| CN112134360A (en) | Control method, device and equipment of elevator power supply circuit and storage medium | |
| CN112689936A (en) | Power supply system | |
| JP2021536219A (en) | Power supply system | |
| CN216086256U (en) | Automatic power switching system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |