CN216599462U - Electrical control system - Google Patents
Electrical control system Download PDFInfo
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- CN216599462U CN216599462U CN202123441046.1U CN202123441046U CN216599462U CN 216599462 U CN216599462 U CN 216599462U CN 202123441046 U CN202123441046 U CN 202123441046U CN 216599462 U CN216599462 U CN 216599462U
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Abstract
The utility model discloses an electrical control system belongs to power transmission and distribution technical field, and electrical control system includes transformer T1, T2, T3 and T4, first frequency conversion unit and second frequency conversion unit, motor M1, M2, M3 and M4; the transformer T1 and the transformer T2 are respectively connected with one end of the first frequency conversion unit, the transformer T3 and the transformer T4 are respectively connected with one end of the second frequency conversion unit, and an isolating switch QS11 is connected between one end of the first frequency conversion unit and one end of the second frequency conversion unit; the motor M1 and the motor M2 are respectively connected with the other end of the first frequency conversion unit, the motor M3 and the motor M4 are respectively connected with the other end of the second frequency conversion unit, and an isolating switch QS12 is connected between the other end of the first frequency conversion unit and the other end of the second frequency conversion unit; the utility model provides a current electrical control system have the reliability lower, the relatively poor problem of practicality, through isolator QS11 and isolator QS12, realize multiple mode switching control to the effect of adaptation different work condition.
Description
Technical Field
The utility model relates to a power transmission and distribution technical field, in particular to electrical control system.
Background
In the application occasion of a high-power motor, a frequency converter is often used as a soft starter to smoothly switch to a power frequency power supply. The existing frequency converter is often provided with a one-to-one bypass cabinet, a one-to-two bypass cabinet and a one-to-n bypass cabinet, and the soft start switching process from the frequency conversion of the frequency converter to the power frequency is realized through an electrical control system arranged in the bypass cabinet.
The existing electric control system is generally configured with a drive-n electric control system aiming at a frequency converter. In the system, when the frequency converter fails to operate, all motors at the user side cannot be started to operate, and the system can be put into operation only after the frequency converter is repaired, so that the production of the user side is seriously influenced in actual use.
Therefore, the electric control system of the frequency converter bypass cabinet in the prior art has the problems of lower reliability and poorer practicability.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at: the utility model provides an electrical control system, aim at solving the electrical control system among the prior art and have the technical problem that the reliability is lower, the practicality is relatively poor.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an electrical control system, including transformer module, converter module and the load module that connects gradually, transformer module still with the load module is connected, transformer module is the power supply of load module, the load module passes through the frequency conversion voltage regulation of converter module control, realizes soft start;
the transformer module comprises a first transformer bank and a second transformer bank, the frequency converter module comprises a first frequency conversion unit and a second frequency conversion unit, and the load module comprises a first motor set and a second motor set; the first frequency conversion unit controls a first motor set, and the second frequency conversion unit controls a second motor set;
the first transformer bank is connected with one end of the first frequency conversion unit, the second transformer bank is connected with one end of the second frequency conversion unit, and an isolating switch QS11 is connected between one end of the first frequency conversion unit and one end of the second frequency conversion unit; the first motor set is connected with the other end of the first frequency conversion unit, the second motor set is connected with the other end of the second frequency conversion unit, and an isolating switch QS12 is connected between the other end of the first frequency conversion unit and the other end of the second frequency conversion unit; the isolating switches QS11 and QS12 are used for switching a motor set correspondingly controlled by the isolating switches to another frequency conversion unit for control when any one of the first frequency conversion unit or the second frequency conversion unit fails; or the isolating switches QS11 and QS12 are used for enabling the two frequency conversion units to be connected in parallel to control the motor group when the single frequency conversion unit with too large load in any one of the first motor group or the second motor group cannot drag.
Optionally, in the above electrical control system, the first transformer bank includes transformers T1, T2, the second transformer bank includes transformers T3 and T4, the first motor bank includes motors M1, M2, and the second motor bank includes motors M3 and M4;
the transformer T1 and the transformer T2 are respectively connected with one end of the first frequency conversion unit, the transformer T3 and the transformer T4 are respectively connected with one end of the second frequency conversion unit, the motor M1 and the motor M2 are respectively connected with the other end of the first frequency conversion unit, and the motor M3 and the motor M4 are respectively connected with the other end of the second frequency conversion unit.
Optionally, in the above electrical control system, the first frequency conversion unit includes a circuit breaker QF31, a frequency converter U1 and a circuit breaker QF71, which are connected in sequence;
one end of the breaker QF31, which is far away from the frequency converter U1, is connected with a common junction of the transformer T1 and the transformer T2;
one end of the breaker QF71 far away from the frequency converter U1 is connected with a common joint of the motor M1 and the motor M2.
Optionally, in the above electrical control system, the second frequency conversion unit includes a circuit breaker QF32, a frequency converter U2, and a circuit breaker QF72, which are connected in sequence;
one end of the breaker QF32, which is far away from the frequency converter U2, is connected with a common junction of the transformer T3 and the transformer T4;
one end of the breaker QF72 far away from the frequency converter U2 is connected with a common joint of the motor M3 and the motor M4.
Optionally, in the above electrical control system, the first inverter unit further includes a first pre-charging cabinet a1 connected between the circuit breaker QF31 and the inverter U1;
the first pre-charging cabinet A1 comprises circuit breakers QF41 and QF42 and a resistor R1;
one end of the breaker QF41 and one end of the breaker QF42 respectively with being close to the breaker QF31 the one end of the converter U1 is connected, the other end of the breaker QF42 with one end of the resistor R1 is connected, the other end of the breaker QF41 and the other end of the resistor R1 respectively with the converter U1 is connected.
Optionally, in the above electrical control system, the second inverter unit further includes a second pre-charging cabinet a2 connected between the circuit breaker QF32 and the inverter U2;
the second pre-charging cabinet A2 comprises circuit breakers QF43 and QF44 and a resistor R2;
one end of the breaker QF43 and one end of the breaker QF44 are respectively connected with one end of the breaker QF32 close to the frequency converter U2, the other end of the breaker QF44 is connected with one end of the resistor R2, and the other end of the breaker QF43 and the other end of the resistor R2 are respectively connected with the frequency converter U2.
Optionally, in the above electrical control system, the first inverter unit further includes a first reactor cabinet B1 connected between the inverter U1 and the breaker QF 71;
the first reactor cabinet B1 comprises a breaker QF51 and an inductor L1;
one end of the breaker QF51 and one end of the inductor L1 are respectively connected with the frequency converter U1, and the other end of the breaker QF51 and the other end of the inductor L1 are respectively connected with one end, close to the frequency converter U1, of the breaker QF 71.
Optionally, in the above electrical control system, the second inverter unit further includes a second reactor cabinet B2 connected between the inverter U2 and the breaker QF 72;
the second reactor cabinet B2 comprises a breaker QF52 and an inductor L2;
one end of the breaker QF52 and one end of the inductor L2 are respectively connected with the frequency converter U2, and the other end of the breaker QF52 and the other end of the inductor L2 are respectively connected with one end, close to the frequency converter U2, of the breaker QF 72.
Alternatively, in the above-described electric control system,
the transformer T1 is connected with one end of the first frequency conversion unit through a breaker QF 21;
the transformer T2 is connected with one end of the first frequency conversion unit through a breaker QF 22;
the transformer T3 is connected with one end of the second frequency conversion unit through a breaker QF 23;
the transformer T4 is connected with one end of the second frequency conversion unit through a breaker QF 24.
Alternatively, in the above-described electric control system,
the motor M1 is connected with the other end of the first frequency conversion unit through a breaker QF 61;
the motor M2 is connected with the other end of the first frequency conversion unit through a breaker QF 62;
the motor M3 is connected with the other end of the second frequency conversion unit through a breaker QF 63;
the motor M4 is connected with the other end of the second frequency conversion unit through a breaker QF 64.
Alternatively, in the above-described electric control system,
the transformer T1 is connected with the motor M1 through a breaker QF 11;
the transformer T2 is connected with the motor M2 through a breaker QF 12;
the transformer T3 is connected with the motor M3 through a breaker QF 13;
the transformer T4 is connected with the motor M4 through a breaker QF 14.
The utility model provides an above-mentioned one or more technical scheme can have following advantage or has realized following technological effect at least:
the utility model provides an electrical control system which is suitable for an electrical system with the number of frequency converters smaller than the number of loads, in particular to a two-to-four electrical system with two frequency converters controlling four motors to realize soft start, is connected with one end of a first frequency conversion unit through a first transformer bank, a second transformer bank is connected with one end of a second frequency conversion unit, an isolating switch QS11 is connected between one end of the first frequency conversion unit and one end of the second frequency conversion unit, a first motor group is connected with the other end of the first frequency conversion unit, a second motor group is connected with the other end of the second frequency conversion unit, an isolating switch QS12 is connected between the other end of the first frequency conversion unit and the other end of the second frequency conversion unit, through the isolating switch QS11 and the isolating switch QS12, various electrical connection modes are realized, therefore, switching control of multiple working modes is realized, different working conditions can be adapted, and higher application reliability and practicability are achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a connection block diagram of the electrical control system of the present invention;
FIG. 2 is a detailed connection block diagram of the electrical control system of the present invention;
fig. 3 is a schematic diagram of the electrical connection of the electrical control system of the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages 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 accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It is to be noted that, in the present invention, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, so that an apparatus or system including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such apparatus or system. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a device or system that comprises the element. In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "connected" may be a fixed connection or a removable connection, or may be integral therewith; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either internally or in interactive relation.
In the present invention, if there is a description referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the present invention, suffixes such as "module", "part", or "unit" used to denote elements are used only for facilitating the description of the present invention, and have no specific meaning by themselves. Thus, "module", "component" or "unit" may be used mixedly.
The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. In addition, the technical solutions of the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
The prior art is analyzed and found that in the application occasion of a high-power motor, the capacity of the power grid side is small, the motor cannot be directly started, and a frequency converter is often required to be used as a soft starter to smoothly switch to a power frequency power supply. The existing frequency converter is often provided with a one-to-one bypass cabinet, a one-to-two bypass cabinet and a one-to-n bypass cabinet, and the soft start switching process from the frequency conversion of the frequency converter to the power frequency is realized through an electrical control system arranged in the bypass cabinet.
The existing electric control system is generally configured with a drive-n electric control system aiming at a frequency converter. In the system, when the frequency converter fails to operate, all motors at the user end cannot be started to operate, and the system can be put into operation only after the frequency converter is repaired, so that the production of the user end is seriously influenced in actual use.
In view of the technical problem that the electrical control system among the prior art has the reliability lower, the practicality is relatively poor, the utility model provides an electrical control system, concrete embodiment and implementation mode are as follows:
referring to fig. 1 to 3, fig. 1 is a connection block diagram of the electrical control system of the present invention, fig. 2 is a detailed connection block diagram of the electrical control system of the present invention, and fig. 3 is an electrical connection schematic diagram of the electrical control system of the present invention; the present embodiment provides an electrical control system.
As shown in fig. 1, the electrical control system includes:
the transformer module, the frequency converter module and the load module are connected in sequence, the transformer module is further connected with the load module, the transformer module supplies power to the load module, and the load module controls frequency conversion and voltage regulation through the frequency converter module to realize soft start.
As shown in the detailed connection block diagram of fig. 2, the transformer module includes a first transformer bank and a second transformer bank, the frequency converter module includes a first frequency conversion unit and a second frequency conversion unit, and the load module includes a first motor set and a second motor set; the first frequency conversion unit controls a first motor set, and the second frequency conversion unit controls a second motor set; the first transformer bank is connected with one end of the first frequency conversion unit, the second transformer bank is connected with one end of the second frequency conversion unit, and an isolating switch QS11 is connected between one end of the first frequency conversion unit and one end of the second frequency conversion unit; the first motor set is connected with the other end of the first frequency conversion unit, the second motor set is connected with the other end of the second frequency conversion unit, and an isolating switch QS12 is connected between the other end of the first frequency conversion unit and the other end of the second frequency conversion unit;
the isolating switches QS11 and QS12 are used for switching a motor set correspondingly controlled by the isolating switches to another frequency conversion unit for control when any one of the first frequency conversion unit or the second frequency conversion unit fails; or the isolating switches QS11 and QS12 are used for enabling the two frequency conversion units to be connected in parallel to control the motor group when the single frequency conversion unit with too large load in any one of the first motor group or the second motor group cannot drag.
In the electrical control system resulting from the above connection, each of the first transformer bank and the second transformer bank may include a plurality of transformers; each of the first motor group and the second motor group may include a plurality of motors; in a normal state, both the isolating switches QS11 and QS12 are disconnected, and the system is two one-to-many electrical control connections; in a fault state, if any frequency conversion unit fails, the isolating switches QS11 and QS12 are both switched on, and the system is in one-to-many electrical control connection; in the parallel operation state, when one frequency conversion unit cannot drag a certain high-power load, the isolating switches QS11 and QS12 are both closed, the two frequency conversion units are connected in parallel, and the system is in two-to-one electrical control connection.
As shown in the electrical connection schematic of fig. 3, in a further embodiment, the first transformer bank includes transformers T1, T2, the second transformer bank includes transformers T3 and T4, the first motor group includes motors M1, M2, the second motor group includes motors M3 and M4; the transformer T1 and the transformer T2 are respectively connected with one end of the first frequency conversion unit, the transformer T3 and the transformer T4 are respectively connected with one end of the second frequency conversion unit, the motor M1 and the motor M2 are respectively connected with the other end of the first frequency conversion unit, and the motor M3 and the motor M4 are respectively connected with the other end of the second frequency conversion unit.
In the electrical control system obtained by the connection, various electrical connection modes can be realized by controlling the on-off of the isolating switches QS11 and QS12, so that the switching control of various working modes is realized. In this embodiment, taking an embodiment in which there are 4 transformers, 2 frequency converters, and 4 motors as an example, the specific control method is as follows:
in a normal state, both the isolating switches QS11 and QS12 are disconnected, and the system is in two-in-two electrical control connection;
in a fault state, if any frequency conversion unit fails, the isolating switches QS11 and QS12 are both switched on, and the system is in one-to-four electrical control connection;
in the parallel operation state, when one frequency conversion unit cannot drag a certain high-power load, the isolating switches QS11 and QS12 are both switched on, the two frequency conversion units are connected in parallel, and the system is in two-to-one electrical control connection.
The system is suitable for the electrical system with the number of the frequency converters smaller than the number of the loads, particularly suitable for a two-to-four electrical system with two frequency converters controlling four motors to realize soft start, and also provides power for the four motors through four transformers respectively so as to provide power for normal work after the motors are soft started. The system can meet the requirement of one-to-two electrical control in a normal state, can also realize one-to-four electrical control in a fault state, and can improve the application reliability of the system by using two frequency conversion units which are standby mutually, is suitable for two-to-one electrical control in a parallel operation state and improves the applicability of the system. The system can be freely switched among the normal state, the fault state and the parallel operation state, and solves the problems that the use of a user is influenced because a corresponding load cannot be started due to the fault of a certain frequency converter, and the single frequency converter with an overlarge load cannot be dragged due to insufficient capacity.
In particular, the transformer is connected to the grid, for example, directly to a bus voltage of 10 KV. The load module may also be other loads, and the multiple motors used in this embodiment may be motors with different powers, and may specifically be selected according to an actual situation, for example, any specification from 6900KW to 18000KW may be arbitrarily used, and of course, motors with other power ranges may also be selected based on the actual situation, so as to meet different actual needs.
Further, the first frequency conversion unit comprises a circuit breaker QF31, a frequency converter U1 and a circuit breaker QF71 which are connected in sequence;
one end of the breaker QF31, which is far away from the frequency converter U1, is connected with a common junction of the transformer T1 and the transformer T2;
one end of the breaker QF71 far away from the frequency converter U1 is connected with a common joint of the motor M1 and the motor M2.
The second frequency conversion unit comprises a breaker QF32, a frequency converter U2 and a breaker QF72 which are connected in sequence;
one end of the breaker QF32, which is far away from the frequency converter U2, is connected with a common junction of the transformer T3 and the transformer T4;
one end of the breaker QF72 far away from the frequency converter U2 is connected with a common joint of the motor M3 and the motor M4.
Through setting up circuit breaker QF31 and circuit breaker QF71 at converter U1 both ends to and setting up circuit breaker QF32 and circuit breaker QF72 at converter U2 both ends, can control the access state of converter, whether convenient as required control will start the converter that corresponds.
Still further, the first inverter unit further comprises a first pre-charging cabinet a1 connected between the circuit breaker QF31 and the inverter U1;
the first pre-charging cabinet A1 comprises circuit breakers QF41 and QF42 and a resistor R1;
one end of the breaker QF41 and one end of the breaker QF42 are respectively connected with one end of the breaker QF31 close to the frequency converter U1, the other end of the breaker QF42 is connected with one end of the resistor R1, and the other end of the breaker QF41 and the other end of the resistor R1 are respectively connected with the frequency converter U1.
The second inverter unit further comprises a second pre-charging cabinet A2 connected between the circuit breaker QF32 and the inverter U2;
the second pre-charging cabinet A2 comprises circuit breakers QF43 and QF44 and a resistor R2;
one end of the breaker QF43 and one end of the breaker QF44 are respectively connected with one end of the breaker QF32 close to the frequency converter U2, the other end of the breaker QF44 is connected with one end of the resistor R2, and the other end of the breaker QF43 and the other end of the resistor R2 are respectively connected with the frequency converter U2.
In this embodiment, the effect of pre-charging cabinet is can effectively protect the device in the circuit, prevents that direct power-on is in the twinkling of an eye, and the too big device that causes of electric current damages, in this embodiment, can protect devices such as converter and circuit breaker.
Still further, the first inverter unit further comprises a first reactor cabinet B1 connected between the inverter U1 and the circuit breaker QF 71;
the first reactor cabinet B1 comprises a breaker QF51 and an inductor L1;
one end of the breaker QF51 and one end of the inductor L1 are respectively connected with the frequency converter U1, and the other end of the breaker QF51 and the other end of the inductor L1 are respectively connected with one end, close to the frequency converter U1, of the breaker QF 71.
The second inverter unit further comprises a second reactor cabinet B2 connected between the inverter U2 and the circuit breaker QF 72;
the second reactor cabinet B2 comprises a breaker QF52 and an inductor L2;
one end of the breaker QF52 and one end of the inductor L2 are respectively connected with the frequency converter U2, and the other end of the breaker QF52 and the other end of the inductor L2 are respectively connected with one end, close to the frequency converter U2, of the breaker QF 72.
In this embodiment, the reactor cabinet is connected in series between the frequency converter and the motor, and can play a role in limiting short-circuit current.
Further, the transformer T1 is connected with one end of the first frequency conversion unit through a breaker QF 21; the transformer T2 is connected with one end of the first frequency conversion unit through a breaker QF 22; the transformer T3 is connected with one end of the second frequency conversion unit through a breaker QF 23; the transformer T4 is connected with one end of the second frequency conversion unit through a breaker QF 24.
In this embodiment, set up the circuit breaker between transformer and frequency conversion unit, conveniently select the corresponding transformer according to actual conditions.
Further, the motor M1 is connected with the other end of the first frequency conversion unit through a breaker QF 61; the motor M2 is connected with the other end of the first frequency conversion unit through a breaker QF 62; the motor M3 is connected with the other end of the second frequency conversion unit through a breaker QF 63; the motor M4 is connected with the other end of the second frequency conversion unit through a breaker QF 64.
In this embodiment, set up the circuit breaker between frequency conversion unit and motor, the motor of corresponding power is conveniently connected according to actual conditions.
Further, the transformer T1 is connected with the motor M1 through a breaker QF 11; the transformer T2 is connected with the motor M2 through a breaker QF 12; the transformer T3 is connected with the motor M3 through a breaker QF 13; the transformer T4 is connected with the motor M4 through a breaker QF 14.
In this embodiment, a circuit breaker is provided between the transformer and the motor, and the motor can be controlled to stop working by cutting off the power supply.
The electrical control system based on the setting has the following specific working process:
at the beginning:
the breakers QF11, QF12, QF13, QF14, QF21, QF22, QF23, QF24, QF61, QF62, QF63, QF64, QF31, QF32, QF71, QF72, QF42 and QF44 are all in an open state, and the breakers QF51 and QF52 are in a closed state.
Under the normal state:
the whole system is divided into two one-drive-two soft start systems, two one-drive-two soft start systems are disconnected by isolating switches QS11 and QS12, wherein QF21 and QF22 are electrically interlocked and cannot be closed at the same time, QF23 and QF24 are electrically interlocked and cannot be closed at the same time, QF61 and QF62 are electrically interlocked and cannot be closed at the same time, and QF63 and QF64 are electrically interlocked and cannot be closed at the same time.
Based on this, taking the soft start of the motor M1 by the inverter U1 as an example, the corresponding operations are: firstly, the circuit breakers QF21, QF31 and QF71 are closed, the frequency converter U1 is precharged, and the self-detection of the system is completed; then, the frequency converter U1 is started, the circuit breaker QF61 is closed, the circuit breaker QF51 is opened, an upcut signal is triggered to perform undisturbed synchronous switching, the frequency converter U1 accelerates to the network side frequency, the frequency locking and phase locking are completed, an unlocking signal is output to the circuit breakers QF61 and QF11, the circuit breaker QF11 is controlled to be closed, the circuit breaker QF61 is opened, the frequency converter U1 stops, the circuit breakers QF31 and QF71 are opened, the circuit breaker QF51 is closed, and the soft start of the motor M1 is completed. Then, if the motor M2 is to be continuously soft-started by the frequency converter U1, the circuit breaker QF21 is disconnected, the circuit breakers QF22, QF31 and QF71 are closed, the frequency converter U1 is pre-charged, and after the system self-inspection is completed, the corresponding circuit breaker is controlled according to the above manner to realize the soft-start of the motor M2, which is not described herein again.
Similarly, the method for soft-starting the motors M3 and M4 through the frequency converter U2 is similar to the method for soft-starting the motors M1 and M2 through the frequency converter U1, and the description is omitted here.
In a fault state:
assuming that the frequency converter U1 fails, the isolating switches QS11 and QS12 combine two-in-two soft start systems into one-in-four soft start system, wherein the QF21, the QF22, the QF23 and the QF24 are electrically interlocked and cannot be closed at the same time, and the QF61, the QF62, the QF63 and the QF64 are electrically interlocked and cannot be closed at the same time.
Based on this, taking the soft start of the motors M1 and M2 by the frequency converter U2 as an example, the corresponding operations are: firstly, the circuit breakers QF21, QF32 and QF72 are closed, the frequency converter U2 is precharged, and the self-detection of the system is completed; then, the frequency converter U2 is started, the circuit breaker QF61 is closed, the circuit breaker QF52 is opened, an upcut signal is triggered to perform undisturbed synchronous switching, the frequency converter U2 accelerates to the network side frequency, the frequency locking and phase locking are completed, an unlocking signal is output to the circuit breakers QF61 and QF11, the circuit breaker QF11 is controlled to be closed, the circuit breaker QF61 is opened, the frequency converter U2 stops, the circuit breakers QF32 and QF72 are opened, the circuit breaker QF52 is closed, and the soft start of the motor M1 is completed. Then, if the motor M2 is to be continuously soft-started through the frequency converter U2, the frequency breaker QF21 is opened, the circuit breakers QF22, QF32 and QF72 are closed, the frequency converter U2 is precharged, after the system self-check is completed, the frequency converter U2 is started, the circuit breaker QF62 is closed, the circuit breaker QF52 is opened, an up-cut signal is triggered, undisturbed synchronous switching is performed, the frequency converter U2 accelerates to a grid-side frequency, frequency locking and phase locking are completed, an unlocking signal is output to the circuit breakers QF62 and QF12, the circuit breaker QF12 is controlled to be closed, the circuit breaker QF62 is opened, the frequency converter U2 is stopped, the circuit breakers QF32 and QF72 are opened, the circuit breaker QF52 is closed, and the soft-start of the motor M2 is completed.
Similarly, the motors M3 and M4 can be subsequently soft-started in the above manner, and the specific operations are similar and will not be described again.
In the parallel operation state:
similarly, according to the above switching operation, one of the motors can be soft-started by the frequency converters U1 and U2. For a specific operation process, reference is made to the above description, and details are not repeated here.
Compared with the existing one-driving-two system electrical control, the two-driving-four electrical control system can connect two one-driving-two systems of the client, the continuous and reliable production of a user cannot be influenced by the fault of a single frequency converter, and the system can be used for application occasions where the single frequency converter cannot be driven by a large load in a double-motor parallel mode, so that the usability is improved.
The electrical control system of the embodiment is connected with one end of a first frequency conversion unit through a transformer T1 and a transformer T2, the transformer T3 and the transformer T4 are connected with one end of a second frequency conversion unit, an isolating switch QS11 is connected between one end of the first frequency conversion unit and one end of the second frequency conversion unit, a motor M1 and a motor M2 are connected with the other end of the first frequency conversion unit, a motor M3 and a motor M4 are connected with the other end of the second frequency conversion unit, and an isolating switch QS12 is connected between the other end of the first frequency conversion unit and the other end of the second frequency conversion unit, so that multiple electrical connection modes are realized, switching control of multiple working modes is realized, different working conditions can be adapted, and high application reliability and practicability are achieved.
It should be noted that the numbers of the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments. The above is only the optional embodiment of the present invention, and not therefore the patent scope of the present invention is limited, all under the idea of the present invention, the equivalent structure transformation made by the contents of the specification and the attached drawings is utilized, or directly or indirectly applied to other relevant technical fields, and all included in the patent protection scope of the present invention.
Claims (10)
1. An electrical control system comprises a transformer module, a frequency converter module and a load module which are sequentially connected, wherein the transformer module is also connected with the load module, the transformer module supplies power to the load module, and the load module controls frequency conversion and voltage regulation through the frequency converter module to realize soft start;
the transformer module comprises a first transformer bank and a second transformer bank, the frequency converter module comprises a first frequency conversion unit and a second frequency conversion unit, and the load module comprises a first motor set and a second motor set; the first frequency conversion unit controls a first motor set, and the second frequency conversion unit controls a second motor set;
the transformer is characterized in that the first transformer bank is connected with one end of the first frequency conversion unit, the second transformer bank is connected with one end of the second frequency conversion unit, and an isolating switch QS11 is connected between one end of the first frequency conversion unit and one end of the second frequency conversion unit;
the first motor set is connected with the other end of the first frequency conversion unit, the second motor set is connected with the other end of the second frequency conversion unit, and an isolating switch QS12 is connected between the other end of the first frequency conversion unit and the other end of the second frequency conversion unit;
the isolating switches QS11 and QS12 are used for switching a motor set correspondingly controlled by the isolating switches to another frequency conversion unit for control when any one of the first frequency conversion unit or the second frequency conversion unit fails;
or the isolating switches QS11 and QS12 are used for enabling the two frequency conversion units to be connected in parallel to control the motor group together when the single frequency conversion unit with too large load in any one group of the first motor group or the second motor group cannot be dragged.
2. The electrical control system of claim 1, wherein the first transformer bank comprises transformers T1, T2, the second transformer bank comprises transformers T3 and T4, the first motor bank comprises motors M1, M2, the second motor bank comprises motors M3 and M4;
the transformer T1 and the transformer T2 are respectively connected with one end of the first frequency conversion unit, the transformer T3 and the transformer T4 are respectively connected with one end of the second frequency conversion unit, the motor M1 and the motor M2 are respectively connected with the other end of the first frequency conversion unit, and the motor M3 and the motor M4 are respectively connected with the other end of the second frequency conversion unit.
3. The electrical control system of claim 2, wherein the first inverter unit comprises a circuit breaker QF31, an inverter U1, and a circuit breaker QF71 connected in series;
one end of the breaker QF31, which is far away from the frequency converter U1, is connected with a common junction of the transformer T1 and the transformer T2;
one end of the breaker QF71 far away from the frequency converter U1 is connected with a common joint of the motor M1 and the motor M2.
4. The electrical control system of claim 3, wherein the second inverter unit comprises a circuit breaker QF32, an inverter U2, and a circuit breaker QF72 connected in series;
one end of the breaker QF32, which is far away from the frequency converter U2, is connected with a common junction of the transformer T3 and the transformer T4;
one end of the breaker QF72 far away from the frequency converter U2 is connected with a common joint of the motor M3 and the motor M4.
5. The electrical control system of claim 4, wherein the first inverter unit further comprises a first pre-charging cabinet A1 connected between the circuit breaker QF31 and the inverter U1;
the first pre-charging cabinet A1 comprises circuit breakers QF41 and QF42 and a resistor R1;
one end of the breaker QF41 and one end of the breaker QF42 respectively with being close to the breaker QF31 the one end of the converter U1 is connected, the other end of the breaker QF42 with one end of the resistor R1 is connected, the other end of the breaker QF41 and the other end of the resistor R1 respectively with the converter U1 is connected.
6. The electrical control system of claim 5, wherein the second inverter unit further comprises a second pre-charging cabinet A2 connected between the circuit breaker QF32 and the inverter U2;
the second pre-charging cabinet A2 comprises circuit breakers QF43 and QF44 and a resistor R2;
one end of the breaker QF43 and one end of the breaker QF44 are respectively connected with one end of the breaker QF32 close to the frequency converter U2, the other end of the breaker QF44 is connected with one end of the resistor R2, and the other end of the breaker QF43 and the other end of the resistor R2 are respectively connected with the frequency converter U2.
7. The electrical control system of claim 4, wherein the first inverter unit further comprises a first reactor cabinet B1 connected between the inverter U1 and the circuit breaker QF 71;
the first reactor cabinet B1 comprises a breaker QF51 and an inductor L1;
one end of the breaker QF51 and one end of the inductor L1 are respectively connected with the frequency converter U1, and the other end of the breaker QF51 and the other end of the inductor L1 are respectively connected with one end, close to the frequency converter U1, of the breaker QF 71;
the second inverter unit further comprises a second reactor cabinet B2 connected between the inverter U2 and the circuit breaker QF 72;
the second reactor cabinet B2 comprises a breaker QF52 and an inductor L2;
one end of the breaker QF52 and one end of the inductor L2 are respectively connected with the frequency converter U2, and the other end of the breaker QF52 and the other end of the inductor L2 are respectively connected with one end, close to the frequency converter U2, of the breaker QF 72.
8. The electrical control system of claim 2,
the transformer T1 is connected with one end of the first frequency conversion unit through a breaker QF 21;
the transformer T2 is connected with one end of the first frequency conversion unit through a breaker QF 22;
the transformer T3 is connected with one end of the second frequency conversion unit through a breaker QF 23;
the transformer T4 is connected with one end of the second frequency conversion unit through a breaker QF 24.
9. The electrical control system of claim 2,
the motor M1 is connected with the other end of the first frequency conversion unit through a breaker QF 61;
the motor M2 is connected with the other end of the first frequency conversion unit through a breaker QF 62;
the motor M3 is connected with the other end of the second frequency conversion unit through a breaker QF 63;
the motor M4 is connected with the other end of the second frequency conversion unit through a breaker QF 64.
10. The electrical control system of claim 2,
the transformer T1 is connected with the motor M1 through a breaker QF 11;
the transformer T2 is connected with the motor M2 through a breaker QF 12;
the transformer T3 is connected with the motor M3 through a breaker QF 13;
the transformer T4 is connected with the motor M4 through a breaker QF 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123441046.1U CN216599462U (en) | 2021-12-30 | 2021-12-30 | Electrical control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123441046.1U CN216599462U (en) | 2021-12-30 | 2021-12-30 | Electrical control system |
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| CN216599462U true CN216599462U (en) | 2022-05-24 |
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| CN202123441046.1U Active CN216599462U (en) | 2021-12-30 | 2021-12-30 | Electrical control system |
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