CN110718418A - Switch parallel capacity expansion operation control method based on single-pole contactor - Google Patents
Switch parallel capacity expansion operation control method based on single-pole contactor Download PDFInfo
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- CN110718418A CN110718418A CN201911015436.7A CN201911015436A CN110718418A CN 110718418 A CN110718418 A CN 110718418A CN 201911015436 A CN201911015436 A CN 201911015436A CN 110718418 A CN110718418 A CN 110718418A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
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Abstract
The invention provides a switch parallel capacity expansion operation control method based on a single-pole contactor, which comprises two-phase intelligent electromagnetic switches operating in a parallel mode; the electromagnetic switch comprises an intelligent control module and two single-pole contactors; the intelligent control module comprises a synchronous control module, a contact state monitoring module, a coil current controller, a contact sampling circuit and a coil voltage sampling circuit; the contact state monitoring module judges the working condition of a contact; when the switch needs to be switched on, the synchronous control module enables the switch to be switched on under the working condition of synchronous phasing; when the brake is required to be opened, the synchronous control module enables the switches to be coordinated and matched with each other to open the brake under the working condition of synchronous zero current; the invention designs two coil current self-adaptive control modes of a normal state and an abnormal state, realizes stable holding when two switches are connected in parallel and expand capacity, performs closed-loop control in the whole process of the parallel operation of two-phase switches, realizes the synchronism of switch opening and closing actions and the self-adaptive control of the holding process, can effectively improve the switch capacity and widen the application range.
Description
Technical Field
The invention relates to the technical field of electric power facilities, in particular to a switch parallel capacity expansion operation control method based on a single-pole contactor.
Background
Along with the continuous development of national economy, the increase of industrial and residential electric loads drives the continuous expansion of the scale of a power grid, a power system is subjected to self capacity expansion and internet interconnection, the system structure is more complicated, the load is larger and larger, the current passing under normal conditions is increased, the frequency of short-circuit faults and the numerical value of short-circuit fault current are improved, the bottleneck problem in the aspects of contact materials and contact structures of contactors is difficult to break through, the rated through-current capacity and breaking capacity of a contactor with a single fracture cannot meet the requirement of the increasing power grid capacity, and therefore capacity expansion operation research of a high-capacity switch is highly concerned by domestic and foreign scholars.
When the through-current capacity and the breaking capacity of the contactor cannot be effectively improved in the aspects of the existing materials and structural conditions, the parallel operation is one of the ways of solving the problem of capacity expansion operation of the switch and completing large-current breaking. Siemens corporation has designed three-phase parallel vacuum circuit breakers to be used in one phase to increase rated breaking short-circuit current, but the scheme cost is high and synchronous operation is not easy to realize. In order to meet the application requirements of high current carrying and large current breaking, a student puts forward a mode of switching off two arc-extinguishing chambers in parallel, and the problem that the requirement on the synchronism of an operating mechanism is high, the influence of the dispersibility of the mechanism is easily caused, and a good synchronous breaking effect cannot be achieved is solved. The contactor is used as a frequently-operated control electrical appliance, if the action synchronism during time division and closing of parallel operation cannot be guaranteed, the main loop current of one phase which exceeds the rated current level is required to be switched on and off, the service life of the electrical appliance is influenced, and even the switching-on and switching-off failure is caused.
The contact system adopts a three-pole moving and static contact parallel mode to realize capacity expansion, a Schneider LC1 series large-capacity alternating current contactor product adopts a double-coil parallel connection mode to increase the electromagnetic attraction in the attraction process of the contactor, the coils are switched to the series connection mode to reduce the attraction power consumption when the attraction process is converted into the attraction process, and the contact system adopts a connecting terminal to carry out parallel connection and capacity expansion for the contact terminal, so that the condition that the two ends of the two-phase contact have larger difference in resistance and cause uneven current distribution is easily caused.
The existing contactors and products which run in parallel and expand capacity on the market are not effectively controlled on the synchronism of on-off operation, depend on a contact mechanism and a parallel connection form of the contactor, and are easily influenced by mechanism abrasion and dispersity. For the frequently operated electromagnetic switch, the synchronization of the opening and closing actions is especially important in the whole process of the parallel operation of the two-phase switches, and the two single-pole contactors have the electromagnetic system and the contact system which are mutually independent, so that the dispersion and the action characteristic difference of the contact mechanism are brought while the phase separation control is conveniently carried out, and certain difficulty is brought to the synchronous control of the opening and closing actions. In addition, when the current equalizing effect of the two-phase switches is poor, or the heavy current abnormal conditions such as overload, short-circuit fault, short-time tolerance experiment and the like occur in a main circuit, a certain phase or two-phase switch simultaneously bears the main circuit current which exceeds the rated current of the phase or two-phase switch by multiple times, in order to prevent the mistaken breaking of each phase switch caused by the sudden increase of the electric repulsive force of the contact, the coil current can be self-adjusted along with the change of the working condition state of the contact, and the holding reliability of each phase switch during parallel operation is ensured.
Disclosure of Invention
The invention provides a control method for switch parallel connection capacity expansion operation based on a single-pole contactor, and provides an optimization control scheme for the whole process of switch parallel connection capacity expansion operation based on the single-pole contactor.
The invention adopts the following technical scheme.
A switch parallel connection capacity expansion operation control method based on a single-pole contactor is used for synchronously controlling a plurality of switches which are expanded in a parallel connection mode, and comprises two-phase intelligent electromagnetic switches which are operated in the parallel connection mode; the two-phase intelligent electromagnetic switch comprises an intelligent control module and two single-pole contactors; the intelligent control module comprises a synchronous control module and a contact state monitoring module, a coil current controller, a contact sampling circuit and a coil voltage sampling circuit which are connected with the synchronous control module; the contact state monitoring module collects contact signals through a contact sampling circuit and judges the working condition of a contact; when the switch needs to be switched on, the synchronous control module sends a synchronous switch-on instruction according to the contact signal, so that the two-phase intelligent electromagnetic switches which operate in parallel are switched on under the working condition of synchronous phasing; when the brake is required to be opened, the synchronous control module sends out a synchronous opening instruction according to the contact signal, so that the two-phase intelligent electromagnetic switches which are operated in parallel are mutually coordinated and matched, and the brake is opened under the working condition of synchronous zero current.
The single-pole contactor is arranged on two parallel branchesK 1、K 2。
The single-pole contactorK 1、K 2Each comprises a coil;
when the intelligent electromagnetic switch is in operation,i coil1andi coil2the coil currents of the two single-pole contactors are respectively,I 1、I 2respectively the contact current of each single-pole contactor,U 1、U 2respectively the voltage across the contacts of each single-pole contactor,Iis the total current of the main circuit;
the contact action time of each single-pole contactor is the contact attraction and contact breaking time of each phase of switch contact which can be measured off-line in advance.
When the intelligent electromagnetic switch needs to be switched on, if the coil voltage is detected to accord with the electrifying range through the coil voltage sampling circuit, the synchronous control module firstly receives electrifying preparation signals of switch contacts of each phase(ii) a Then, the zero point detection is carried out on the voltage signals at the two ends of each phase of switch contact, because the switches are operated in parallel, the amplitude and the phase of the voltage signals at the two ends of the two phases of switch contacts are theoretically the same, and after the zero point is detected, the switch pull-in time measured in advance in an off-line mode is combinedt 1Then the required closing phase
Determining software delay timet 2So that
；
Software delay time is passed through at each phase switch contactt 2And then, the synchronous control module receives the electrifying completion signal of each phase of switch contact, the synchronous control module sends a synchronous closing instruction to each phase of switch contact, the given value of the coil current is set as a larger attracting current value, strong excitation control is carried out, the switch contact can rapidly act, and after the action time of the switch contact mechanism, each phase of switch contact can be closed at the selected phase.
In order to eliminate errors caused by the response difference of the hardware circuit of each phase of switch, the power-on preparation signal and the power-on completion signal of each phase of switch contact are processed by a logic gate circuit in the synchronous control module, and the synchronous control module can send out a synchronous closing instruction only under the condition that the power-on completion signals of each phase of switch are sent out.
In the control method, the
The following can be obtained:
；
by the mutual coordination and matching of the software delay time and the switch contact attraction time, the switch contacts of each phase are controlled in a split-phase mode, and synchronous closing signal processing is performed through the synchronous control module, so that synchronous control of closing actions of two-phase intelligent electromagnetic switches operating in a parallel mode is completed, the closing phases of the two-phase switch contacts are ensured to be consistent, and synchronous phased closing of the two-phase switch contacts is realized.
When the two-phase intelligent electromagnetic switch is switched from the attraction process to the attraction state, the control method uses a coil current self-adjusting control scheme containing contact state feedback;
the self-adjusting control scheme of the coil current is as follows: a sampling circuit in an intelligent control module collects switch contact circuit signals in real time, and meanwhile, the amplitude and the slope of contact current signals are rapidly calculated, the judgment speed of the magnitude of contact current is accelerated by the simultaneous calculation of the amplitude and the slope, so that a contact state detection module in the scheme is formed, a double closed-loop control system containing contact state feedback is established, two coil current control modes of a normal state and an abnormal state are designed, an outer loop feedback of the contact state is transmitted to a coil current controller by the collecting circuit, the coil current controller changes a given value of an inner loop of the coil current, the coil current controller adopts hysteresis comparison control, and the given value of the coil current is compared with an actual coil current value of each phase switch to realize closed-loop control.
When the coil current controller judges that the contact current is abnormal current larger than a rated value, the coil current given value is rapidly increased to attracting current, the attracting current is converted into strong excitation control, attracting time is set to be strong excitation control time, when a large current condition is generated, the coil current is rapidly adjusted to a safe current value which is enough to enable the switch contact to generate large attraction force so as to ensure that the switch contact keeps the attracting state, and after the strong excitation control is finished, the coil current controller reduces the coil current given value to a coil current value which enables an iron core to work in critical saturation, so that the iron core utilization rate is fully increased while the strong magnetic attraction force of the switch contact is ensured; when the current of the switch contact returns to normal state, the coil current controller reduces the given value of the coil current to a smaller value, so that each phase switch keeps energy-saving operation.
When the intelligent electromagnetic switch needs to perform synchronous zero-current switching-off operation, the contact state monitoring module firstly performs zero detection on the contact current of each phase and transmits an actual current signal to the intelligent control module through the contact current signal acquisition circuit, and the intelligent control module performs software filtering processing on the current signal by adopting a sliding average filtering algorithm;
the intelligent control module directly sends a power-off preparation signal to the synchronous control module for the one-phase switch contact which firstly detects the zero point, and transmits the phase zero point detection condition to the synchronous signal conditioning circuit of the other-phase switch contact through the logic circuit, so that the other-phase switch contact does not perform zero point detection on the current of the phase switch contact any more, but directly generates the power-off preparation signal, thereby eliminating the influence of zero detection errors of the zero point detection circuit on each-phase switch contact and further ensuring the consistency of power-off instructions of each-phase switch;
and then the intelligent control module combines the switching contact breaking time measured in advance, coordinates with the software delay time of each phase of switching contact, and sends a power-off completion signal to each phase of switching contact after software delay, so that the coil current given value of each switching contact is set to be zero, and the rapid breaking control is carried out.
In the quick breaking control, a coil current controller is used for controlling the current of the coil to be quickly reduced to zero, and the voltage at two ends of the coil is kept to be negative; after the breaking time of each phase switch mechanism, each phase switch is completely broken at the zero phase, so that the synchronism of the breaking moment is ensured, and the breaking process of each phase switch basically keeps the synchronous state of parallel operation all the time.
The invention has the advantages that:
1. when the switch is switched on, the synchronous phased switch-on control is carried out on the two-phase switch which is in parallel connection and capacity expansion operation, the synchronous switch-on signal is divided into a power-on preparation signal and a power-on completion signal which are respectively used for zero point detection of voltages at two ends of a contact and selection of a switch-on phase position, the switch-on process of two independent single-pole contactors is synchronously controlled through a synchronous control module, the power-on preparation signal is processed through a logic circuit in the synchronous control module, the synchronous control module sends out the synchronous switch-on signal, and errors caused by corresponding differences of hardware circuits can be eliminated.
2. When the switch is held, the invention designs two normal and abnormal current control modes, constantly monitors the working condition state of the electromagnetic switch contact in the holding process, adaptively adjusts the coil current control mode, and changes the single energy-saving control mode that the coil current reference value is not changed in the holding process. The electromagnetic switch is kept in an energy-saving operation state in a normal state control mode, a double closed loop control system containing contact state feedback is established, when overload and short-circuit faults occur in a contact and a short-time current tolerance experiment occurs in the contact or serious non-uniform current occurs in a parallel two-phase switch, when a contact of one phase of switch bears main loop current which exceeds rated current of the switch by multiple times, a coil current control mode is changed into an abnormal state control mode, electromagnetic attraction is rapidly improved, the contact is prevented from being broken by mistake, and stable attraction of the electromagnetic switch is realized.
3. When synchronous zero-current switching-off control is carried out on two-phase switches which are in parallel connection and capacity expansion operation, if one phase switch detects a contact current zero point firstly, the other phase switch acquires the phase zero point detection condition through a synchronous control module and immediately generates a power-off preparation signal, so that the influence caused by error zero-detection errors of various switches is eliminated, the synchronous zero-current switching-off of the various phase switches is realized by mutually coordinating software delay and the section time of the various phase switches, and the synchronous control module sends out the same-phase and switching-off instructions to ensure that the various phase switches are basically in a parallel connection state in the whole switching-off process.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic diagram of the present invention.
Detailed Description
As shown in fig. 1, a control method for parallel connection expansion operation of switches based on a single-pole contactor is used for synchronously controlling a plurality of switches expanded in a parallel connection manner, and the control method includes two-phase intelligent electromagnetic switches operated in a parallel connection manner; the two-phase intelligent electromagnetic switch comprises an intelligent control module and two single-pole contactors; the intelligent control module comprises a synchronous control module and a contact state monitoring module, a coil current controller, a contact sampling circuit and a coil voltage sampling circuit which are connected with the synchronous control module; the contact state monitoring module collects contact signals through a contact sampling circuit and judges the working condition of a contact; when the switch needs to be switched on, the synchronous control module sends a synchronous switch-on instruction according to the contact signal, so that the two-phase intelligent electromagnetic switches which operate in parallel are switched on under the working condition of synchronous phasing; when the brake is required to be opened, the synchronous control module sends out a synchronous opening instruction according to the contact signal, so that the two-phase intelligent electromagnetic switches which are operated in parallel are mutually coordinated and matched, and the brake is opened under the working condition of synchronous zero current.
The single-pole contactor is arranged on two parallel branchesK 1、K 2。
The single-pole contactorK 1、K 2Each comprises a coil;
when the intelligent electromagnetic switch is in operation,i coil1andi coil2the coil currents of the two single-pole contactors are respectively,I 1、I 2respectively the contact current of each single-pole contactor,U 1、U 2respectively the voltage across the contacts of each single-pole contactor,Iis the total current of the main circuit;
the contact action time of each single-pole contactor is the contact attraction and contact breaking time of each phase of switch contact which can be measured off-line in advance.
When the intelligent electromagnetic switch needs to be switched on, if the coil voltage is detected to be in accordance with the electrifying range through the coil voltage sampling circuit, the synchronous control module firstly receives electrifying preparation signals of switch contacts of each phase; then, the zero point detection is carried out on the voltage signals at the two ends of each phase of switch contact, because the switches are operated in parallel, the amplitude and the phase of the voltage signals at the two ends of the two phases of switch contacts are theoretically the same, and after the zero point is detected, the switch pull-in time measured in advance in an off-line mode is combinedt 1Then the required closing phase
Determining software delay timet 2So that；
Software delay time is passed through at each phase switch contactt 2And then, the synchronous control module receives the electrifying completion signal of each phase of switch contact, the synchronous control module sends a synchronous closing instruction to each phase of switch contact, the given value of the coil current is set as a larger attracting current value, strong excitation control is carried out, the switch contact can rapidly act, and after the action time of the switch contact mechanism, each phase of switch contact can be closed at the selected phase.
In order to eliminate errors caused by the response difference of the hardware circuit of each phase of switch, the power-on preparation signal and the power-on completion signal of each phase of switch contact are processed by a logic gate circuit in the synchronous control module, and the synchronous control module can send out a synchronous closing instruction only under the condition that the power-on completion signals of each phase of switch are sent out.
In the control method, the
The following can be obtained:
；
by the mutual coordination and matching of the software delay time and the switch contact attraction time, the switch contacts of each phase are controlled in a split-phase mode, and synchronous closing signal processing is performed through the synchronous control module, so that synchronous control of closing actions of two-phase intelligent electromagnetic switches operating in a parallel mode is completed, the closing phases of the two-phase switch contacts are ensured to be consistent, and synchronous phased closing of the two-phase switch contacts is realized.
When the two-phase intelligent electromagnetic switch is switched from the attraction process to the attraction state, the control method uses a coil current self-adjusting control scheme containing contact state feedback;
the self-adjusting control scheme of the coil current is as follows: a sampling circuit in an intelligent control module collects switch contact circuit signals in real time, and meanwhile, the amplitude and the slope of contact current signals are rapidly calculated, the judgment speed of the magnitude of contact current is accelerated by the simultaneous calculation of the amplitude and the slope, so that a contact state detection module in the scheme is formed, a double closed-loop control system containing contact state feedback is established, two coil current control modes of a normal state and an abnormal state are designed, an outer loop feedback of the contact state is transmitted to a coil current controller by the collecting circuit, the coil current controller changes a given value of an inner loop of the coil current, the coil current controller adopts hysteresis comparison control, and the given value of the coil current is compared with an actual coil current value of each phase switch to realize closed-loop control.
When the coil current controller judges that the contact current is abnormal current larger than a rated value, the coil current given value is rapidly increased to attracting current, the attracting current is converted into strong excitation control, attracting time is set to be strong excitation control time, when a large current condition is generated, the coil current is rapidly adjusted to a safe current value which is enough to enable the switch contact to generate large attraction force so as to ensure that the switch contact keeps the attracting state, and after the strong excitation control is finished, the coil current controller reduces the coil current given value to a coil current value which enables an iron core to work in critical saturation, so that the iron core utilization rate is fully increased while the strong magnetic attraction force of the switch contact is ensured; when the current of the switch contact returns to normal state, the coil current controller reduces the given value of the coil current to a smaller value, so that each phase switch keeps energy-saving operation.
When the intelligent electromagnetic switch needs to perform synchronous zero-current switching-off operation, the contact state monitoring module firstly performs zero detection on the contact current of each phase and transmits an actual current signal to the intelligent control module through the contact current signal acquisition circuit, and the intelligent control module performs software filtering processing on the current signal by adopting a sliding average filtering algorithm;
the intelligent control module directly sends a power-off preparation signal to the synchronous control module for the one-phase switch contact which firstly detects the zero point, and transmits the phase zero point detection condition to the synchronous signal conditioning circuit of the other-phase switch contact through the logic circuit, so that the other-phase switch contact does not perform zero point detection on the current of the phase switch contact any more, but directly generates the power-off preparation signal, thereby eliminating the influence of zero detection errors of the zero point detection circuit on each-phase switch contact and further ensuring the consistency of power-off instructions of each-phase switch;
and then the intelligent control module combines the switching contact breaking time measured in advance, coordinates with the software delay time of each phase of switching contact, and sends a power-off completion signal to each phase of switching contact after software delay, so that the coil current given value of each switching contact is set to be zero, and the rapid breaking control is carried out.
In the quick breaking control, a coil current controller is used for controlling the current of the coil to be quickly reduced to zero, and the voltage at two ends of the coil is kept to be negative; after the breaking time of each phase switch mechanism, each phase switch is completely broken at the zero phase, so that the synchronism of the breaking moment is ensured, and the breaking process of each phase switch basically keeps the synchronous state of parallel operation all the time.
Claims (10)
1. The utility model provides a switch is parallelly connected dilatation operation control method based on unipolar contactor for carry out synchronous control to a plurality of switches through parallelly connected mode dilatation, its characterized in that: the control method comprises two-phase intelligent electromagnetic switches which are operated in a parallel mode; the two-phase intelligent electromagnetic switch comprises an intelligent control module and two single-pole contactors; the intelligent control module comprises a synchronous control module and a contact state monitoring module, a coil current controller, a contact sampling circuit and a coil voltage sampling circuit which are connected with the synchronous control module; the contact state monitoring module collects contact signals through a contact sampling circuit and judges the working condition of a contact; when the switch needs to be switched on, the synchronous control module sends a synchronous switch-on instruction according to the contact signal, so that the two-phase intelligent electromagnetic switches which operate in parallel are switched on under the working condition of synchronous phasing; when the brake is required to be opened, the synchronous control module sends out a synchronous opening instruction according to the contact signal, so that the two-phase intelligent electromagnetic switches which are operated in parallel are mutually coordinated and matched, and the brake is opened under the working condition of synchronous zero current.
2. The method for controlling the parallel connection capacity-extended operation of the switch based on the single-pole contactor as claimed in claim 1, wherein: the single-pole contactor is arranged on two parallel branchesK 1、K 2。
3. The method for controlling the parallel connection capacity-extended operation of the switch based on the single-pole contactor as claimed in claim 2, wherein: the single-pole contactorK 1、K 2Each comprises a coil;
when the intelligent electromagnetic switch is in operation,i coil1andi coil2the coil currents of the two single-pole contactors are respectively,I 1、I 2respectively the contact current of each single-pole contactor,U 1、U 2respectively the voltage across the contacts of each single-pole contactor,Iis the total current of the main circuit;
the contact action time of each single-pole contactor is the contact attraction and contact breaking time of each phase of switch contact which can be measured off-line in advance.
4. The method for controlling the parallel connection capacity-extended operation of the switch based on the single-pole contactor as claimed in claim 3, wherein: when the intelligent electromagnetic switch needs to be switched on, if the coil voltage is detected to be in accordance with the electrifying range through the coil voltage sampling circuit, the synchronous control module firstly receives electrifying preparation signals of switch contacts of each phase; then, the zero point detection is carried out on the voltage signals at the two ends of each phase of switch contact, because the switches are operated in parallel, the amplitude and the phase of the voltage signals at the two ends of the two phases of switch contacts are theoretically the same, and after the zero point is detected, the switch pull-in time measured in advance in an off-line mode is combinedt 1Then the required closing phase
Determining software delay timet 2So that
；
Software delay time is passed through at each phase switch contactt 2Then, the synchronous control module receives the power-on completion signal of each phase switch contact, and sends a synchronous closing instruction to each phase switch contact, andthe given value of the coil current is set as a larger attracting current value, strong excitation control is carried out, so that the switch contacts can act quickly, and after the action time of the switch contact mechanism, the switch contacts of each phase can be closed at the selected phase.
5. The method for controlling the parallel connection capacity-extended operation of the switch based on the single-pole contactor as claimed in claim 4, wherein: in order to eliminate errors caused by the response difference of the hardware circuit of each phase of switch, the power-on preparation signal and the power-on completion signal of each phase of switch contact are processed by a logic gate circuit in the synchronous control module, and the synchronous control module can send out a synchronous closing instruction only under the condition that the power-on completion signals of each phase of switch are sent out.
6. The method for controlling the parallel connection capacity-extended operation of the switch based on the single-pole contactor as claimed in claim 5, wherein: in the control method, the
The following can be obtained:
；
by the mutual coordination and matching of the software delay time and the switch contact attraction time, the switch contacts of each phase are controlled in a split-phase mode, and synchronous closing signal processing is performed through the synchronous control module, so that synchronous control of closing actions of two-phase intelligent electromagnetic switches operating in a parallel mode is completed, the closing phases of the two-phase switch contacts are ensured to be consistent, and synchronous phased closing of the two-phase switch contacts is realized.
7. The method for controlling the parallel connection capacity-extended operation of the switch based on the single-pole contactor as claimed in claim 3, wherein: when the two-phase intelligent electromagnetic switch is switched from the attraction process to the attraction state, the control method uses a coil current self-adjusting control scheme containing contact state feedback;
the self-adjusting control scheme of the coil current is as follows: a sampling circuit in an intelligent control module collects switch contact circuit signals in real time, and meanwhile, the amplitude and the slope of contact current signals are rapidly calculated, the judgment speed of the magnitude of contact current is accelerated by the simultaneous calculation of the amplitude and the slope, so that a contact state detection module in the scheme is formed, a double closed-loop control system containing contact state feedback is established, two coil current control modes of a normal state and an abnormal state are designed, an outer loop feedback of the contact state is transmitted to a coil current controller by the collecting circuit, the coil current controller changes a given value of an inner loop of the coil current, the coil current controller adopts hysteresis comparison control, and the given value of the coil current is compared with an actual coil current value of each phase switch to realize closed-loop control.
8. The method for controlling the parallel connection capacity-extended operation of the switch based on the single-pole contactor as claimed in claim 7, wherein: when the coil current controller judges that the contact current is abnormal current larger than a rated value, the coil current given value is rapidly increased to attracting current, the attracting current is converted into strong excitation control, attracting time is set to be strong excitation control time, when a large current condition is generated, the coil current is rapidly adjusted to a safe current value which is enough to enable the switch contact to generate large attraction force so as to ensure that the switch contact keeps the attracting state, and after the strong excitation control is finished, the coil current controller reduces the coil current given value to a coil current value which enables an iron core to work in critical saturation, so that the iron core utilization rate is fully increased while the strong magnetic attraction force of the switch contact is ensured; when the current of the switch contact returns to normal state, the coil current controller reduces the given value of the coil current to a smaller value, so that each phase switch keeps energy-saving operation.
9. The method for controlling the parallel connection capacity-extended operation of the switch based on the single-pole contactor as claimed in claim 3, wherein: when the intelligent electromagnetic switch needs to perform synchronous zero-current switching-off operation, the contact state monitoring module firstly performs zero detection on the contact current of each phase and transmits an actual current signal to the intelligent control module through the contact current signal acquisition circuit, and the intelligent control module performs software filtering processing on the current signal by adopting a sliding average filtering algorithm;
the intelligent control module directly sends a power-off preparation signal to the synchronous control module for the one-phase switch contact which firstly detects the zero point, and transmits the phase zero point detection condition to the synchronous signal conditioning circuit of the other-phase switch contact through the logic circuit, so that the other-phase switch contact does not perform zero point detection on the current of the phase switch contact any more, but directly generates the power-off preparation signal, thereby eliminating the influence of zero detection errors of the zero point detection circuit on each-phase switch contact and further ensuring the consistency of power-off instructions of each-phase switch;
and then the intelligent control module combines the switching contact breaking time measured in advance, coordinates with the software delay time of each phase of switching contact, and sends a power-off completion signal to each phase of switching contact after software delay, so that the coil current given value of each switching contact is set to be zero, and the rapid breaking control is carried out.
10. The method for controlling the parallel connection capacity-extended operation of the switch based on the single-pole contactor as claimed in claim 9, wherein: in the quick breaking control, a coil current controller is used for controlling the current of the coil to be quickly reduced to zero, and the voltage at two ends of the coil is kept to be negative; after the breaking time of each phase switch mechanism, each phase switch is completely broken at the zero phase, so that the synchronism of the breaking moment is ensured, and the breaking process of each phase switch basically keeps the synchronous state of parallel operation all the time.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112965401A (en) * | 2021-02-08 | 2021-06-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Large-current control device and method for transformer fireproof and explosion-proof physical check test |
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| CN114237075B (en) * | 2021-12-17 | 2024-03-29 | 福州大学 | Electromagnetic switch closing control method for intelligently identifying load |
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