Control device for alternating current ice melting

Abstract

The control device comprises a control module, an ice melting power supply module, a boundary switch, a short circuit switch and an ice melting switch, the boundary switch, the short circuit switch, the ice melting switch and a protection switch are arranged on a high-voltage cable, and the control module sequentially drives the boundary switch, the short circuit switch, the ice melting switch and the protection switch to execute state switching through action instructions. The conduction control of the ice melting loop is realized; the control module integrates a finite element algorithm function, collects current, voltage and temperature distribution parameters in an ice melting loop in real time, and dynamically corrects ice melting current parameters through three-dimensional electromagnetic-thermal coupling field simulation; setting a parametric modeling unit, and calculating an optimal voltage regulation gear based on a heat balance equation and a Joule heat effect to realize adaptive voltage regulation; the demarcation switch, the short circuit switch and the ice melting switch are arranged, the effect of cable short circuit heating ice melting is achieved by sequentially controlling the on-off states of all the switches, finite element real-time simulation and parameterization voltage regulation decision are combined, and the cable ice melting efficiency, reliability and safety are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of AC ice melting, and particularly relates to a control device for AC ice melting. Background Art

[0002] High-voltage cables are power facilities that meet the long-distance power transmission requirements of the power grid. Since high-voltage cables are installed outdoors, in cold weather environments, the lines of high-voltage cables are prone to icing, resulting in a decrease in the current transmission temperature of high-voltage cables and an increase in the load of high-voltage cables, affecting the stability of power transmission of high-voltage cables.

[0003] In existing AC ice melting solutions, ice melting devices mostly rely on fixed current thresholds or empirical voltage regulation gears to set fixed ice melting current outputs, apply voltages to the ice-covered sections of high-voltage cables, and the ice melting operation mainly relies on manual labor to complete a series of complex and critical steps of relevant knife switches of high-voltage cables, and finally realizes the three-phase short circuit of high-voltage cables, so that the high-voltage cables can generate heat based on the current and meet the ice melting requirements.

[0004] The above solutions have poor adaptability to environmental parameters, cannot adjust output parameters in real time according to dynamic variables such as cable diameter, ice thickness, and wind speed, have low ice melting efficiency and a risk of local overheating; in addition, the solutions do not consider the interaction between the electromagnetic field and the temperature field during the ice melting process, and there may be a mismatch of thermodynamic parameters due to uneven ice layer distribution on the cable surface, especially obvious in high-altitude and strong wind environments; at the same time, there are many manual operation links, which not only require extremely high professional skills and experience of operators, but also the whole process is relatively cumbersome, consuming a large amount of manpower and material resources, and thus limit the length of the ice melting line to a certain extent, and there are also certain safety risks during the operation process. Therefore, there is an urgent need for an AC ice melting control device that integrates real-time simulation and parametric decision-making, and realizes efficient, safe and energy consumption-optimal cable ice melting control through dynamically correcting current parameters and adaptive voltage regulation strategies, combined with automatic switch control. Summary of the Invention

[0005] Aiming at the problems of low control accuracy, lack of dynamic parameter adaptation, and cumbersome operation process of existing ice melting devices, the present invention proposes a control device for AC ice melting, which integrates finite element simulation and parametric modeling for automatic AC ice melting control. By setting a sectionalizing switch, a short-circuit switch and an ice melting switch, combining the finite element algorithm to correct the ice melting current parameters in real time and the parametric modeling unit to calculate the optimal voltage regulation gear, and by sequentially controlling the opening and closing states of each switch, the precise control of the short circuit and heat generation of high-voltage cables for ice melting is realized, significantly improving the ice melting efficiency, reliability and safety of cables.

[0006] The present invention provides a control device for AC ice melting, and the control device includes: a control module, an ice melting power supply module, a sectionalizing switch and a short-circuit switch arranged on the high-voltage cable;

[0007] The ice melting power supply module, sectionalizing switch, and short-circuit switch cooperate with the high-voltage cable to form an ice melting circuit. An ice melting switch is provided in the ice melting circuit. The control module drives the sectionalizing switch, short-circuit switch, ice melting switch, and protection switch to perform state switching in sequence through action instructions, so as to realize the on-off control of the ice melting circuit;

[0008] The control module integrates the finite element algorithm function, collects the current, voltage, and temperature distribution parameters in the ice melting circuit in real time, and dynamically corrects the ice melting current parameters through three-dimensional electromagnetic-thermal coupling field simulation, which can be expressed as:

[0009] K = f(I cal , T max , U real );

[0010] K n+1 = K n + K p · e n + K i ∑e n + K d (e n - e n-1 );

[0011] I new = K · I base ;

[0012] Among them, K is the ice melting current correction coefficient, I cal is the simulated calculation current, T max is the highest temperature of the current ice layer, U real is the measured voltage, K p , K i and K d are PID algorithm factors, e n is the temperature error, I new is the corrected ice melting current, I base is the ice melting current before correction;

[0013] The control module is built with a parametric modeling unit. Taking the cable diameter, ambient temperature, wind speed, and ice coating thickness as input variables, it calculates the optimal voltage regulation gear based on the heat balance equation and Joule heat effect to realize adaptive voltage regulation, which can be expressed as:

[0014] A ice = π(D + d ice ) 2 / 4 - A c ;

[0015]

[0016] Among them, A ice is the cross-sectional area of ice accretion, D is the wire diameter of the ice melting cable, d ice is the ice accretion thickness, A c is the cross-sectional area of the wire, ρ ice (T) is the resistivity of the ice layer, which is dynamically correlated with the temperature field, I is the corrected ice melting current, and E is the voltage regulation gear obtained by solving based on the gradient descent method;

[0017] The control module includes: a main control unit and a slave control unit. The main control unit is connected to the slave control unit based on a wireless signal. The main control unit is electrically connected to the sectionalizing switch and the ice melting switch, and the slave control unit is electrically connected to the short-circuit switch.

[0018] Furthermore, the control device further includes a voltage regulation component. The ice melting power supply module is drivingly connected to the voltage regulation component, and the output end of the voltage regulation component is connected to the high-voltage cable;

[0019] The voltage regulation component receives the optimal voltage regulation gear signal output by the parametric modeling unit, combines the ice melting current correction parameter, and dynamically adjusts the output voltage range to ensure the dynamic adaptation of the ice melting current and the ice layer heat load;

[0020] The ice melting switch is arranged on the line segment between the ice melting power supply module and the short-circuit switch.

[0021] Furthermore, the control device further includes a protection switch arranged in the ice melting circuit, and the protection switch is in a normally open state;

[0022] When the control device performs ice melting work, the protection switch switches to the closed state based on the voltage regulation stable state of the voltage regulation component.

[0023] Furthermore, the ice melting power supply module includes: a main power circuit and a backup power circuit, and the backup power circuit is connected to the main power circuit;

[0024] The input end of the main power circuit is connected to an AC power supply, and the output end of the main power circuit is connected to the voltage regulation component.

[0025] Furthermore, the backup power circuit includes a plurality of capacitor units and a plurality of equalization units. The plurality of capacitor units are connected in series to the main circuit of the backup power circuit, and the plurality of equalization units are connected in parallel to the plurality of capacitor units one by one.

[0026] Furthermore, the backup power circuit further includes a switching circuit, and the switching circuit is arranged at the connection position between the main power circuit and the backup power circuit;

[0027] The switching circuit is provided with a first diode and a second diode connected in parallel, and the conduction directions of the circuits of the first diode and the second diode are opposite.

[0028] Further, a main control board and a first switch control module are arranged in the main control unit, and the first switch control module is signal-connected to the main control board based on a connection wire;

[0029] The first switch control module is provided with at least three groups of switch control components, and any one of the switch control components includes a first switch control unit for controlling the switch to disconnect and a second switch control unit for controlling the switch to close;

[0030] The multiple switch control components of the first switch control module are respectively connected to the sectionalizing switch, the ice melting switch, and the protection switch in one-to-one correspondence.

[0031] Further, the control device is further provided with a feedback circuit, and the feedback circuit is electrically connected to the sectionalizing switch, the short-circuit switch, the ice melting switch, and the protection switch;

[0032] The feedback circuit is signal-connected to the control module, and the control module obtains an action feedback signal of any one of the sectionalizing switch, the short-circuit switch, the ice melting switch, and the protection switch based on the feedback circuit.

[0033] Further, a slave control board and a second switch control module are arranged in the slave control unit, and the second switch control module is signal-connected to the slave control board based on a connection wire;

[0034] The second switch control module is provided with more than one group of switch control components, and the switch control components are electrically connected to the short-circuit switch.

[0035] Further, the control device further includes a zero-crossing detection circuit arranged in the ice melting power supply module;

[0036] The zero-crossing detection circuit is arranged on the A-phase input circuit of the ice melting power supply module, and the zero-crossing detection circuit is electrically connected to the control module.

[0037] The present invention provides a control device for AC ice melting. By arranging a main control unit and a slave control unit based on signal connection, cooperating with the sectionalizing switch, the short-circuit switch, the ice melting switch, and the protection switch arranged in the internal circuit structure of the control device, sequential control of multiple switches is realized based on the main control unit and the slave control unit, the working signal transmission stability of the AC ice melting control device is improved, and based on the sequential control of multiple switches, efficient short-circuit ice melting operation of the ice melting device on the ice-covered section of the high-voltage cable can be realized, and the reliability and safety of the AC ice melting operation are improved. Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a schematic structural diagram of a control device for AC ice melting in an embodiment of the present invention;

[0040] Figure 2 It is a schematic framework diagram of a control device for AC ice melting in an embodiment of the present invention;

[0041] Figure 3 It is a schematic structural diagram of a main control unit in an embodiment of the present invention;

[0042] Figure 4 It is a schematic structural diagram of a first switch control module in an embodiment of the present invention;

[0043] Figure 5 It is a schematic structural diagram of a slave control unit in an embodiment of the present invention;

[0044] Figure 6 It is a schematic structural diagram of a second switch control module in an embodiment of the present invention;

[0045] Figure 7 It is a schematic structural diagram of a backup power supply circuit in an embodiment of the present invention;

[0046] Figure 8 It is a schematic structural diagram of a balancing unit in an embodiment of the present invention;

[0047] Figure 9 It is a schematic structural diagram of a feedback circuit in an embodiment of the present invention;

[0048] Figure 10 It is a schematic structural diagram of a zero-crossing detection circuit in an embodiment of the present invention.

[0049] Figure 11 It is a schematic algorithm diagram for the ice melting operation of the control device in an embodiment of the present invention. Detailed implementation manners

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, rather than all, embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0051] Figure 1 The structural schematic diagram of the control device for AC ice melting in the embodiment of the present invention is shown. Figure 2 The frame schematic diagram of the control device for AC ice melting in the embodiment of the present invention is shown. The control device includes: a control module 1, an ice melting power supply module, a sectionalizing switch 5 and a short-circuit switch 4 arranged on the high-voltage cable. For the ice-covered section of the high-voltage cable, based on the sectionalizing switch 5, the high-voltage cable can be opened for operation, so that the ice melting device can short-circuit the ice-covered section of the high-voltage cable, and the electro-thermal ice melting operation of the ice-covered section of the high-voltage cable can be realized.

[0052] The control module 1 is built-in with a data acquisition module, which can collect the current, voltage and temperature distribution parameters in the ice melting loop in real time. The collected parameters are based on the integrated finite element algorithm, and the ice melting current parameters are dynamically corrected through three-dimensional electromagnetic-thermal coupling field simulation.

[0053] Specifically, the data acquisition module includes a current transformer, a voltage transformer and a distributed temperature measurement sensor array. A three-dimensional electromagnetic model is constructed based on the collected data to solve the Joule heat distribution, which can be expressed as:

[0054] Q = I 2 R(x,T);

[0055] Among them, Q is the Joule heat distribution value, I is the current, R is the resistance, x is the position, T is the temperature, and the resistivity R(x,T) changes with the position x and the temperature T.

[0056] Based on the Joule heat distribution, through the transient heat conduction equation, combined with the convective heat dissipation boundary condition, the ice layer temperature rise process is simulated, which can be expressed as:

[0057]

[0058] Among them, ρ represents the material density, c represents the specific heat of the material, T represents the temperature, t represents the time, k represents the heat conduction coefficient, and Q represents the Joule heat distribution value.

[0059] According to the measured temperature data, the ice layer resistivity model is corrected and fed back to the electromagnetic field simulation to realize two-way coupling iteration, which can be expressed as:

[0060]

[0061] Among them, β = 0.02 °C -1 , ρ ice (T) is the ice layer resistivity.

[0062] Define the ice melting current correction coefficient as K, which can be expressed as:

[0063] K = f(I cal ,Tmax , U real );

[0064] Among them, I cal is the simulation calculation current, T max is the current highest ice layer temperature, U real is the measured voltage.

[0065] The PID control algorithm is used to dynamically adjust K to balance the ice melting efficiency and energy consumption, which can be expressed as:

[0066] K n+1 = K n + K p ·e n + K i ∑e n + K d (e n - e n-1 );

[0067] Among them, K p , K i and K d are the PID algorithm factors, and the temperature error e n = T target - T max .

[0068] Based on the ice melting current correction coefficient, the ice melting loop current can be dynamically adjusted, which can be expressed as:

[0069] I new = K·I base

[0070] Among them, I new is the corrected ice melting current, and I base is the ice melting current before correction.

[0071] The control module 1 is built-in with a parametric modeling unit, which takes the cable wire diameter, ambient temperature, wind speed, and ice thickness as input variables, calculates the optimal voltage regulation gear based on the heat balance equation and Joule heat effect, drives the adaptive voltage regulation, and realizes the optimal energy matching during the ice melting process.

[0072] Specifically, the parametric modeling unit provides the ice melting cable wire diameter D, ambient temperature T amb , wind speed v, and ice thickness d ice as variable inputs. Based on the cable wire diameter D and ice thickness d ice , the equivalent ice layer cross-sectional area can be calculated, which can be expressed as:

[0073] A c = πD 2 / 4;

[0074] A ice = π(D + d ice ) 2 / 4 - A c ;

[0075] where A ice is the ice-covered cross-sectional area, A c is the cross-sectional area of the cable, d ice is the ice thickness, and D is the cable diameter.

[0076] Based on the wind speed v, the convective heat transfer coefficient can be calculated and expressed as:

[0077] h = 12.1 + kv 0.8 ;

[0078] where h is the convective heat transfer coefficient, k is the thermal conductivity, and v is the wind speed.

[0079] Combined with the corrected ice melting current I, the minimized voltage regulation level E is solved based on the gradient descent method and can be expressed as:

[0080]

[0081] where ρ ice (T) is the ice layer resistivity, which is dynamically correlated with the temperature field.

[0082] The ice melting power supply module, the sectionalizing switch 5, and the short-circuit switch 4 cooperate with the high-voltage cable to form an ice melting circuit. The ice melting circuit is provided with an ice melting switch 3. The control module 1 drives the sectionalizing switch 5, the short-circuit switch 4, and the ice melting switch 3 to perform state switching in sequence through action instructions, realizing the on-off control of the ice melting circuit. The ice melting power supply module is used to provide a working power supply for the ice melting circuit, short-circuit the ice-covered section of the high-voltage cable based on the ice melting circuit, so that the ice-covered section of the high-voltage cable can generate heat based on the large current inside the high-voltage cable, realizing the ice melting operation of the ice-covered section of the high-voltage cable.

[0083] Furthermore, the working principle of the ice melting circuit is as follows: By driving the sectionalizing switch 5 to act through the control module 1, the sectionalizing switch 5 is switched from the closed state to the open state, realizing the open-circuit operation of the high-voltage cable, so that the ice-covered section of the high-voltage cable is in an open-circuit state. After the control device obtains the open state of the sectionalizing switch 5, the control device can drive the short-circuit switch 4 to switch from the open state to the closed state, short-circuiting the ice-covered section of the high-voltage cable and connecting it to the ice melting circuit. After the control device obtains the closed state of the short-circuit switch 4, it drives the ice melting switch 3 to switch from the open state to the closed state. By sequentially controlling the on-off states of each switch, the smooth control of the short-circuit ice melting operation of the ice-covered section of the high-voltage cable can be satisfied, and the voltage and current mutation when the high-voltage cable is switched to the ice melting circuit can be reduced, improving the safety of the high-voltage cable based on AC short-circuit ice melting.

[0084] Specifically, the control module 1 includes a main control unit 11 and a slave control unit 12. The main control unit 11 and the slave control unit 12 are connected based on a wireless signal. The main control unit 11 is electrically connected to the sectionalizing switch 5 and the ice melting switch 3, and the slave control unit 12 is electrically connected to the short - circuit switch 4. By setting the main control unit 11 and the slave control unit 12 to control different switches, switches with a relatively long set distance can be accurately controlled by different control units. Based on the wireless signal connection, the signal connection between the main control unit 11 and the slave control unit 12 can be realized, which can simplify the circuit layout structure between the main control unit 11 and the slave control unit 12, thereby simplifying the layout structure of the AC ice melting control device.

[0085] Specifically, the control device further includes a voltage regulating component 6. The ice melting power supply module is drivingly connected to the voltage regulating component 6. The output end of the voltage regulating component 6 is connected to the high - voltage cable. The voltage regulating component 6 receives the optimal voltage regulating gear signal output by the parametric modeling unit and combines the ice melting current correction parameter to adjust the working voltage of the ice melting circuit, so that the working voltage of the ice melting circuit can meet the efficient ice melting operation for the ice - covered section of the high - voltage cable, reduce the energy loss of the ice melting device, and improve the working reliability of the AC ice melting device.

[0086] The ice melting switch 3 is arranged on the line segment between the ice melting power supply module and the short - circuit switch 4. The ice melting switch 3 serves as an insurance measure for the short - circuit switch 4. Since the main control unit 11 and the slave control unit 12 are connected by a wireless signal, by setting the ice melting switch 3, it can be avoided that when a communication failure occurs between the main control unit 11 and the slave control unit 12, the conduction state of the ice melting circuit is inconsistent with the recognition state of the control module 1, that is, to ensure that the ice melting circuit is in an open - circuit state before performing the ice melting operation, thereby improving the working safety of the ice melting circuit.

[0087] Furthermore, the control device further includes a protection switch 2 disposed in the ice melting circuit. The protection switch 2 is in a normally open state. When the control device performs ice melting work, the protection switch 2 switches to a closed state based on the voltage regulation stable state of the voltage regulation component 6. By providing the protection switch 2, after the ice melting switch 3 switches to a closed state based on the control module 1, the control device can drive the voltage regulation component 6 to perform a voltage regulation operation, that is, adjust the working voltage of the ice melting circuit according to the icing state of the high-voltage cable. After the voltage regulation component 6 completes the adjustment of the working voltage of the ice melting circuit, the control module 1 switches the protection switch 2 from an open state to a closed state, thereby realizing the conduction of the ice melting circuit, so that the ice-covered section of the high-voltage cable is in a short-circuited state, so that the working current of the ice melting circuit generates heat to realize the ice melting operation of the high-voltage cable.

[0088] Specifically, please refer to Figure 2 , by arranging the main control unit 11 and the slave control unit 12 at the head and end of the ice-covered section of the high-voltage cable, cooperating with the sectionalizing switch 5 arranged at the head of the ice-covered section of the high-voltage cable and the short-circuit switch 4 arranged at the end of the ice-covered section of the high-voltage cable, it is possible to realize the state change of the ice-covered section of the high-voltage cable from open circuit to access to the ice melting circuit, and cooperate with the voltage regulation control unit to adjust the working voltage of the ice melting circuit, so as to achieve rapid ice melting adjustment of the ice-covered section of the high-voltage cable.

[0089] Furthermore, a human-machine interaction unit is provided in the working system of the ice melting device. When icing occurs on the high-voltage cable, based on the on-site staff, the ice melting device can be started to work through the human-machine interaction unit. The human-machine interaction unit generates a control signal for the main control unit 11 based on the operation instructions of the on-site staff, so that the main control unit 11 can drive the sectionalizing switch 5 to disconnect based on the control signal, so that the high-voltage cable is in an open-circuit state. The main control unit 11 generates a control signal based on the disconnection signal of the sectionalizing switch 5 and sends it to the slave control unit 12, so that the slave control unit 12 can drive the short-circuit switch 4 to close, realizing the short-circuit of the ice-covered section of the high-voltage cable. The slave control unit 12 generates a feedback signal based on the closed signal of the short-circuit switch 4 and sends it to the main control unit 11, so that the main control unit 11 can drive the ice melting switch 3 to perform a closing operation according to the feedback signal.

[0090] Furthermore, after the ice melting switch 3 completes the closing operation, the voltage transformation component of the control device can adjust the output voltage of the voltage transformation component according to the actual ice melting requirement, that is, by adjusting the coil connection state in the voltage transformation component, adjust the input voltage of the voltage transformation component to the ice melting circuit.

[0091] After the voltage transformation component completes the adjustment of voltage transformation output, the main control unit 11 drives the protection switch 2 to close based on the feedback signal of the voltage transformation component and the closed state signal of the ice melting switch 3, thereby realizing the conduction control of the ice melting circuit, so that the control device can perform ice melting operation on the ice-covered section of the high-voltage cable. The control process is realized by using a loop detection algorithm. For the algorithm implementation, please refer to Figure 11 。

[0092] Figure 3 shows a schematic structural diagram of the main control unit 11 in an embodiment of the present invention, Figure 4 shows a schematic structural diagram of the first switch control module 1 in an embodiment of the present invention. A main control board and a first switch control module 1 are arranged in the main control unit 11. The first switch control module 1 and the main control board are signal-connected based on a connection wire. Please refer to the attached Figure 3 and the attached Figure 4 . Signal ports PC0, PC1, PC2, PC3, PC4, and PC5 are arranged on the main control board of the main control unit 11, and are signal-connected to the signal ports DO-1, DO-2, DO-3, DO-4, DO-5, and DO-6 in the first switch control module 1 respectively, so that signal connection can be realized between the main control board and the first switch control module 1. And based on the six signal connection ports, the main control unit 11 and the first switch control module 1 can meet the opening and closing control of the sectionalizing switch 5, the ice melting switch 3, and the protection switch 2.

[0093] Further, in this embodiment, DO-1 and DO-2 are used to transmit the control signal of the sectionalizing switch 5, and DO-1 is used to transmit the closing signal instruction of the sectionalizing switch 5, and DO-2 is used to transmit the opening signal instruction of the sectionalizing switch 5.

[0094] DO-3 and DO-4 are used to transmit the control signal of the ice melting switch 3, and DO-3 is used to transmit the closing signal instruction of the ice melting switch 3, and DO-4 is used to transmit the opening signal instruction of the ice melting switch 3.

[0095] DO-5 and DO-6 are used to transmit the control signal of the protection switch 2, and DO-5 is used to transmit the closing signal instruction of the protection switch 2, and DO-6 is used to transmit the opening signal instruction of the protection switch 2.

[0096] Specifically, the first switch control module 1 is provided with at least three groups of switch control components. Any of the switch control components includes a first switch control unit for controlling the switch to open and a second switch control unit for controlling the switch to close. A plurality of the switch control components of the first switch control module 1 are connected to the sectionalizing switch 5, the ice melting switch 3, and the protection switch 2 in one-to-one correspondence. The first switch control module 1 obtains a signal instruction based on a signal port and controls the corresponding switch control component based on the obtained signal instruction to realize the opening and closing control of the sectionalizing switch 5, the ice melting switch 3, and the protection switch 2.

[0097] Figure 5 Fig. shows the structural schematic diagram of the slave control unit 12 in the embodiment of the present invention. Figure 6 Fig. shows the structural schematic diagram of the second switch control module 1 in the embodiment of the present invention. Further, the slave control unit 12 is provided with a slave control board and the second switch control module 1. The second switch control module 1 is signal-connected to the slave control board based on a connecting wire.

[0098] The second switch control module 1 is provided with more than one group of switch control components, and the switch control components are electrically connected to the short-circuit switch.

[0099] Specifically, in this embodiment, the slave control unit 12 correspondingly controls the opening and closing actions of the short-circuit switch 4. Based on the signal connection between the second switch control module 1 and the slave control board provided in the slave control unit 12, the transmission of the closing and opening signal instructions of the short-circuit switch 4 is realized, and in cooperation with the switch control components of the second switch control module 1, the short-circuit switch 4 is driven to realize the closing conduction operation, or based on the switch control components of the second switch control module 1, the short-circuit switch 4 is driven to realize the opening operation.

[0100] Further, based on the cooperation between the master control unit 11 of the control device and the first switch control module 1, the opening and closing control of multiple switches at the proximal end of the ice melting device can be realized. Based on the cooperation between the slave control unit 12 of the control device and the second switch control module 1, the opening and closing control of the short-circuit switch at the distal end of the ice melting device can be realized, and in cooperation with the wireless signal connection between the master control unit 11 and the slave control unit 12, the control device can meet the sequential opening and closing control of multiple switches, improving the working stability of the control device.

[0101] Specifically, Figure 7 Fig. shows the structural schematic diagram of the backup power supply circuit in the embodiment of the present invention. Figure 8The structural schematic diagram of the balancing unit in the embodiment of the present invention is shown. The ice melting power supply module includes: a main power supply circuit and a backup power supply circuit. The backup power supply circuit is connected to the main power supply circuit. The input end of the main power supply circuit is connected to an AC power supply, and the output end of the main power supply circuit is connected to the voltage regulating component 6. The control device is powered based on the main power supply circuit. Based on the cooperation of the backup power supply circuit and the main power supply circuit, the control device can maintain a stable power supply effect during the ice melting operation, ensuring the normal use of the control device.

[0102] Please refer to Figure 7 , the backup power supply circuit includes a plurality of capacitor units and a plurality of balancing units. A plurality of capacitor units are connected in series to the main circuit of the backup power supply circuit. Electrical energy can be stored based on the plurality of capacitor units, and a plurality of balancing units are connected in parallel to the plurality of capacitor units one by one. The working voltages of the plurality of capacitor units are adjusted based on the plurality of balancing units, so that the working voltages of the plurality of capacitor units are the same, avoiding the situation that the working voltages of the capacitor units are too large, and ensuring the working stability of the capacitor units.

[0103] Further, please refer to Figure 7 , the rated working voltage of the capacitor unit is 2.7V, and the working voltage connected to the backup power supply circuit is 24V. In this embodiment, 10 of the capacitor units are connected in series to the backup power supply circuit at the same time. The working voltages of the first 9 capacitor units are adjusted to 2.64V through the balancing unit. The 10th capacitor unit is used as a backup unit, which can meet the usage requirements of the capacitor units.

[0104] Further, since a plurality of capacitor units are connected in series, the voltage distribution of each capacitor unit in the backup power supply circuit is uneven, affecting the use stability of the backup power supply circuit. By connecting a balancing unit in parallel to each capacitor unit, the working voltage of each capacitor unit can be stabilized at 2.64V, thereby ensuring the working stability and reliability of the backup power supply circuit.

[0105] Specifically, please refer to Figure 8 , the balancing unit is provided with an adjustable precision shunt regulator, model: LTL431, for regulating voltage, and is cooperatively provided with a PNP type triode, model: SS8550Y2, and an NPN type triode, model: D882M200 - 400. Through the voltage stabilizing operation of closed-loop control on the input voltage of the capacitor unit, the working voltage of each capacitor unit is adjusted based on the set voltage regulation threshold, so that the working voltage of each capacitor unit can be kept the same and stabilized at a working voltage of 2.64V, meeting the working requirements of each capacitor unit.

[0106] Specifically, the backup power supply circuit further includes a switching circuit, and the switching circuit is arranged at the connection position between the main power supply circuit and the backup power supply circuit;

[0107] The switching circuit is provided with a first diode and a second diode connected in parallel, and the conduction directions of the circuits of the first diode and the second diode are opposite. The main circuit of the backup power supply circuit is connected to the input circuit of the working power supply based on the first diode. When the input voltage of the main power supply circuit is greater than the voltage of the backup power supply circuit, the main power supply circuit can input current to the backup power supply circuit, so as to charge the capacitor unit of the backup power supply circuit.

[0108] When the voltage of the backup power supply circuit is equal to the voltage of the main power supply circuit, the working current of the working power supply stops inputting to the backup power supply circuit.

[0109] When sudden situations such as a break or overcurrent occur in the main power supply circuit, the backup power supply circuit outputs current to the output end of the main power supply circuit based on the branch where the second diode is located, and supplies power to the control device based on the electric energy stored in a plurality of capacitor units, so as to ensure the working stability of the ice melting control device.

[0110] Furthermore, based on the backup power supply, the working safety and reliability of the ice melting control device can be improved, so that the ice melting control device can meet the ice melting control requirements of the actual icing section of the high-voltage cable.

[0111] Specifically, Figure 9 The structure diagram of the feedback circuit in the embodiment of the present invention is shown. The control device is further provided with a feedback circuit, and the feedback circuit is electrically connected to the sectionalizing switch 5, the short-circuit switch 4, the ice melting switch 3, and the protection switch 2;

[0112] The feedback circuit is signal-connected to the control module 1. The control module 1 obtains any action feedback signal of the sectionalizing switch 5, the short-circuit switch 4, the ice melting switch 3, and the protection switch 2 based on the feedback circuit. By arranging the feedback circuit inside the control device, the action signals of each switch can be collected and fed back through the feedback circuit, which can improve the independence and accuracy of the internal signal transmission management of the control device, and at the same time can reduce the data processing volume of the main control unit 11 and the slave control unit 12, thereby improving the working safety of the control device.

[0113] Specifically, Figure 10The structural schematic diagram of the zero-crossing detection circuit in the embodiment of the present invention is shown. The control device further includes a zero-crossing detection circuit provided in the ice melting power supply module. The zero-crossing detection circuit is provided on the A-phase input circuit of the ice melting power supply module, and the zero-crossing detection circuit is electrically connected to the control module 1. The zero-crossing detection circuit is based on a comparison circuit. By setting a fixed voltage threshold, the voltage data at the input end of the zero-crossing detection circuit is compared with the set voltage threshold, and corresponding signal data is output according to the comparison result, so that the main control unit 11 of the control device can obtain the stability state of the working voltage of the ice melting device based on the detection data of the zero-crossing detection circuit, so as to adjust the voltage in time and improve the working reliability and safety of the control device.

[0114] The present invention provides a control device for AC ice melting. By setting a main control unit 11 and a slave control unit 12 based on signal connection, cooperating with the disconnection switch 5, short-circuit switch 4, ice melting switch 3 and protection switch 2 provided in the internal circuit structure of the control device, the sequential control of multiple switches is realized based on the main control unit 11 and the slave control unit 12, improving the smoothness of the working signal transmission of the AC ice melting control device. Based on the sequential control of multiple switches, the ice melting device can perform an efficient short-circuit ice melting operation on the ice-covered section of the high-voltage cable, and improve the reliability and safety of the AC ice melting operation.

[0115] In addition, the above has introduced in detail a control device for AC ice melting provided by the embodiment of the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. At the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A control device for AC ice melting, characterized in that, The control device includes: a control module, an ice melting power supply module, a sectionalizing switch and a short-circuit switch arranged on the high-voltage cable; The ice melting power supply module, the sectionalizing switch, and the short-circuit switch cooperate with the high-voltage cable to form an ice melting loop. An ice melting switch is arranged in the ice melting loop. The control module drives the sectionalizing switch, the short-circuit switch, the ice melting switch, and the protection switch to perform state switching in sequence through action instructions, so as to realize the on-off control of the ice melting loop; The control module integrates the finite element algorithm function, and real-time collects the current, voltage, and temperature distribution parameters in the ice melting loop, and dynamically corrects the ice melting current parameters through three-dimensional electromagnetic-thermal coupling field simulation, which can be expressed as: K = f(I cal , T max , U real ); K n+1 = K n + K p · e n + K i ∑ e n + K d (e n - e n-1 ); I new = K·I base ; where K is the ice melting current correction coefficient, I cal is the simulation calculation current, T max is the highest temperature of the current ice layer, U real is the measured voltage, K p , K i and K d are the PID algorithm factors, e n is the temperature error, I new is the corrected ice melting current, I base is the ice melting current before correction; The control module is built with a parametric modeling unit, which takes the cable diameter, ambient temperature, wind speed, and ice coating thickness as input variables, and calculates the optimal voltage regulation gear based on the heat balance equation and the Joule heat effect to realize adaptive voltage regulation, which can be expressed as: A ice = π(D + d ice ) 2 / 4 - A c ; Among them, A ice is the ice-covered cross-sectional area, D is the wire diameter of the ice-melting cable, d ice is the ice thickness, A c is the cross-sectional area of the conductor, ρ ice (T) is the resistivity of the ice layer, which is dynamically correlated with the temperature field, I is the corrected ice-melting current, and E is the voltage regulation gear solved based on the gradient descent method; The control module includes: a main control unit and a slave control unit. The main control unit and the slave control unit are connected based on a wireless signal. The main control unit is electrically connected to the sectionalizing switch and the ice melting switch, and the slave control unit is electrically connected to the short-circuit switch.

2. The control device for AC ice melting according to claim 1, wherein The control device further includes a voltage regulation component. The ice melting power supply module is drivingly connected to the voltage regulation component, and the output end of the voltage regulation component is connected to the high-voltage cable; The voltage regulation component receives the optimal voltage regulation gear signal output by the parametric modeling unit, and combines the ice melting current correction parameter to adjust the ice melting output voltage; The ice melting switch is arranged on the line segment between the ice melting power supply module and the short-circuit switch.

3. The control device for AC ice melting according to claim 2, characterized in that, The control device further includes a protection switch arranged in the ice melting loop, and the protection switch is in a normally open state; When the control device performs ice melting work, the protection switch switches to the closed state based on the voltage regulation stable state of the voltage regulation component.

4. The control device for AC ice melting according to claim 3, characterized in that The ice melting power supply module includes: a main power supply circuit and a standby power supply circuit, and the standby power supply circuit is connected to the main power supply circuit; The input end of the main power supply circuit is connected to an AC power supply, and the output end of the main power supply circuit is connected to the voltage regulation component.

5. The control device for AC ice melting according to claim 4, characterized in that The standby power supply circuit includes a plurality of capacitor units and a plurality of balancing units. The plurality of capacitor units are connected in series to the main circuit of the standby power supply circuit, and the plurality of balancing units are respectively connected in parallel to the plurality of capacitor units.

6. The control device for AC ice melting according to claim 5, characterized in that, The standby power supply circuit further includes a switching circuit, and the switching circuit is arranged at the connection position between the main power supply circuit and the standby power supply circuit; The switching circuit is provided with a first diode and a second diode connected in parallel, and the conduction directions of the first diode and the second diode are opposite.

7. The control device for AC ice melting according to claim 1, characterized in that, A main control board and a first switch control module are arranged in the main control unit, and the first switch control module is connected to the main control board based on a connection wire signal; The first switch control module is provided with at least three groups of switch control components. Any one of the switch control components includes a first switch control unit for controlling the switch to disconnect and a second switch control unit for controlling the switch to close; A plurality of the switch control components of the first switch control module are respectively connected to the sectionalizing switch, the ice melting switch, and the protection switch in one-to-one correspondence.

8. The control device for AC ice melting according to claim 7, characterized in that, The control device is further provided with a feedback circuit, which is electrically connected to the sectionalizing switch, the short-circuit switch, the ice melting switch, and the protection switch; The feedback circuit is in signal connection with the control module, and the control module obtains an action feedback signal of any one of the sectionalizing switch, the short-circuit switch, the ice melting switch, and the protection switch based on the feedback circuit.

9. The control device for AC ice melting according to claim 1, characterized in that, The slave control unit is provided with a slave control board and a second switch control module, and the second switch control module is in signal connection with the slave control board based on a connection wire; The second switch control module is provided with more than one group of switch control components, and the switch control components are electrically connected to the short-circuit switch.

10. The control device for AC ice melting according to claim 1, characterized in that The control device further includes a zero-crossing detection circuit provided in the ice melting power supply module; The zero-crossing detection circuit is provided on the A-phase input circuit of the ice melting power supply module, and the zero-crossing detection circuit is electrically connected to the control module.

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