CN214755726U

CN214755726U - Intelligent configuration control system for double main power networks

Info

Publication number: CN214755726U
Application number: CN202022758351.2U
Authority: CN
Inventors: 张守和; 刘飞; 史剑国; 周金木; 冯梁; 平原; 赵国军
Original assignee: Cggc Un Power Co ltd
Current assignee: Cggc Un Power Co ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-11-16
Anticipated expiration: 2030-11-25

Abstract

The utility model discloses a double-main-grid intelligent configuration control system of a diesel generating set power station, which comprises a main electric network controller with a CANbus communication interface, wherein the main electric network controller consists of a main module and a display screen, and the main module is connected with the display screen through a special data line; a changeover switch ZK; electronic voltage relays Y1 and Y2; contactors KM1 and KM 2; a set of storage batteries; a battery charger BC; an ac power inlet switch Q0; main grid on/off relays SR and OR; a set of fuses FU; a set of backup relays; external interface terminal rows, etc.; the utility model adopts a controller to control two main power grids by adopting an intelligent detection switching technology to complete the processing of all operation modes and operation flows of a double main power grid power station; on the basis of the reliability of the double-circuit main power network, the control system is miniaturized through the intelligent configuration technology of the single-circuit main power network, and is simple in structure, high in performance and low in cost.

Description

Intelligent configuration control system for double main power networks

Technical Field

The utility model belongs to the technical field of power station control and specifically relates to a control system, specifically speaking are intelligent configuration control system to two main electric network diesel generating set power stations.

Background

The operation process logic flow of the distributed power station mainly realizes automatic coordination control, scheduling and system operation mode conversion of various power supplies such as commercial power, a diesel generator set and the like, and the controller is used for realizing the control function of the power station through communication networking. For a power station with higher reliability requirement, an external power supply of the power station generally consists of two lines of commercial power incoming lines, namely, two main power networks generally need two independent main power network controllers, and the controllers are communicated with controllers of distributed power supplies such as a diesel generator set and the like to form a network, so that system configuration and operation control parameters are shared, and the overall control of the power station is completed.

In practical application, the intelligent switching technology design can be considered, only one controller is used for realizing detection control of two main power networks and completing various operation flows of the power station, so that the power station system has the reliability application of two mains supplies and also has simple power station configuration of a single mains supply structure, and the control technology of the diesel generator set system is optimized. The system configuration can reasonably adapt to the requirement of the reliability level of the power station, and the system has the advantages of simple control structure, high performance, low cost and small control system. To achieve this objective, it is necessary to design an intelligent configuration control system by combining the input/output structural features of the controller of the main power grid, and configure an auxiliary circuit to perform status detection and identification switching control on the main power grid, and perform corresponding wiring modification and control logic programming on the controller.

Disclosure of Invention

In order to solve the problem, the utility model designs a two main electric network intelligent configuration control systems.

The technical scheme of the utility model is that:

the double-main-grid intelligent configuration control system comprises a main grid controller with a CANbus communication interface, wherein the main grid controller consists of a main module and a display screen, and the main module is connected with the display screen through a special data line; a changeover switch ZK; electronic voltage relays Y1 and Y2; contactors KM1 and KM 2; a set of storage batteries; a battery charger BC; an ac power inlet switch Q0; main grid on/off relays SR and OR; a set of fuses FU; a set of backup relays; external interface terminal rows, etc. The above components are integrated in a control panel device with a door lock.

The utility model discloses control system is as follows to the measurement monitoring interface of power station main electric wire netting: the output of a secondary side fuse of a first main power grid voltage transformer PT1 is connected to the main power grid voltage sampling input end of a main power grid controller through a first group of normally open main contacts of a contactor KM 1; the secondary side fuse output of a second main grid voltage transformer PT2 is connected to the main grid voltage sampling input of the main grid controller through a first group of normally open main contacts of a contactor KM 2. A measuring module of the electronic voltage relay Y1 samples a voltage transformer PT1 of the first main power grid; the measuring module of the electronic voltage relay Y2 samples the voltage transformer PT2 of the second mains grid. A first normally open control point of the contactor KM1 is connected with a first normally open point of a main power grid switching-on relay SR in series and then outputs a switching-on control signal serving as a first main power grid breaker M1; and a first normally open control point of the contactor KM2 is connected with a second normally open point of the main power grid closing relay SR in series and then outputs a closing control signal serving as a second main power grid breaker M2.

The measurement monitoring interface of the control system to the main bus of the power station is as follows: the output of a secondary side fuse of a first main bus voltage transformer PT3 is connected to the main bus voltage sampling input end of a main power grid controller through a second group of normally open main contacts of a contactor KM 1; the secondary side fuse output of the second main bus voltage transformer PT4 is connected to the main bus voltage sampling input of the main power network controller through the second set of normally open main contacts of the contactor KM 2.

The main network controller is otherwise wired as follows: the storage battery pack is connected with a working power supply terminal of the main power network controller through a fuse; the external connection of a relay SR coil is connected with a normally open output point of an internal relay R2 for controlling the closing of the main power grid; the normally open output point of the internal relay R1 is connected to the signal input point of the closing position of the main power grid through an external connecting line, and the normally closed output point of the R1 is connected to the signal input point of the opening position of the main power grid through an external connecting line; inputting a switching value signal: a second normally-open control point of the contactor KM1, a second normally-open control point of the contactor KM2, an auxiliary normally-open point of a first main power grid circuit breaker M1, an auxiliary normally-open point of a second main power grid circuit breaker M2 and an auxiliary normally-open point of a bus tie circuit breaker M0 are respectively connected to a switching value signal input point of the main power grid controller; the internal relay R3 is normally open and the output point is externally connected with a relay OR coil (for standby and used according to the actual needs of users) under the control of the main grid opening; the main power network controller is connected with the loop of each generator set controller of the power station through a CANbus protocol communication cable.

The automatic main power grid state identification switching auxiliary circuit is connected as follows: the circuit working power supply is taken from the fuse protection output of the storage battery pack; the normally open point of the electronic voltage relay Y1, the normally closed point of the electronic voltage relay Y2, the normally closed control point of the contactor KM2 and the coil of the contactor KM1 are sequentially connected and then connected between a working power supply V + and a working power supply V-, and a left 45-degree turn-on point 1-2 of a change-over switch ZK is connected in parallel with a series loop of the normally closed point of the electronic voltage relay Y2 and the normally closed control point of the contactor KM 2; the normally open point of the electronic voltage relay Y2, the normally closed point of the electronic voltage relay Y1, the normally closed control point of the contactor KM1 and the coil of the contactor KM2 are sequentially connected and then connected between a direct-current power supply V + and a direct-current power supply V-, and a 45-degree switch-on point 3-4 at the right side of a change-over switch ZK is connected in parallel with a series loop of the normally closed point of the electronic voltage relay Y1 and the normally closed control point of the contactor KM 1; the power supply modules of the electronic voltage transformers Y1 and Y2 are connected between the direct current power supplies V + and V-; the loop direct current working power supply adopts a fuse protector for protection.

Connecting a direct current power supply working power supply: the commercial power auxiliary alternating current power supply is connected with a battery charger BC through a switch Q0, the battery charger BC charges a storage battery pack through a charging circuit, and the storage battery pack provides a working power supply for the control system.

According to the hardware system and the wiring, the corresponding software setting requirements are as follows:

the logical programming requirements of the main network controller are as follows: and when the voltage sampling input of the main power grid of the controller is normal, the main power grid is normal, otherwise, the main power grid fails. When the voltage sampling point input of the main bus of the controller is normal, the main bus is electrified, otherwise, the main bus is in a power failure state. When the switching value signal input KM1 is active, the first main grid is used as the controller configuration main grid, and the state of the internal relay R1 is determined by the switching value signal input point M1, that is: when the M1 signal is valid, the R1 normally open point is closed, and when the M1 signal is invalid, the R1 normally closed point is closed; the operation process of the synchronization detection of the grid connection of the power station unit, which is returned to be normal by the main power grid, is carried out aiming at the first main power grid. When the switching value signal input KM2 is active, the second main grid is used as the controller configuration main grid, and the state of the internal relay R1 is determined by the switching value signal input point M2, that is: when the M2 signal is valid, the R1 normally open point is closed, and when the M2 signal is invalid, the R1 normally closed point is closed; and the synchronous detection operation process of the grid connection of the power station unit, in which the main power grid returns to normal, is carried out aiming at the second main power grid. When the main power grid returns to normal and the unit regulation reaches the synchronous condition, the normally open output point of the relay R2 in the controller acts to close and drive the external closing relay SR; the actual main grid breaker M1 or M2 performing the contemporaneous operation is selected by the KM1 or KM2 state. When the controller switching value signal inputs KM1 and KM2 are both invalid, the main power grid in the controller configuration is in a fault state; the auxiliary circuit was designed to be impossible to be effective at the same time with KM1 and KM2 with a reliable interlocking function. The priority configuration main power grid is selectively determined by the auxiliary circuit transfer switch; after the two fault main grids return to be normal, the power station unit firstly performs a grid-connected process with the priority main grid, after synchronous switch-on is successful, a logic instruction is used for separating and disconnecting a connecting line of the grid-connected main grid, the connecting line is automatically switched to the other main grid for configuration in combination with the change of the grid structure into a logic condition, the controller still considers that the main grid is to be connected and enters a new grid-connected process, after the synchronous grid-connection is successful, the unit enters a shutdown program, and the system recovers a normal operation mode.

The auxiliary circuit functions are explained as follows:

because the main electric network controller only receives the configuration of one main electric network, an external configuration circuit is needed to perform the intelligent state detection switching control of the main electric network, and the operation is completed by matching with the main electric network controller. The auxiliary circuit functions as follows: the electronic voltage relay Y1/Y2 is provided with a working power supply to enable the electronic voltage relay to work normally; selecting an automatic priority configuration main power grid by using a change-over switch ZK; when the two main power networks are normal, the main power network controller performs configuration and detection control on the priority main power network; when the priority main power grid fails and the non-priority main power grid is normal, the configuration is automatically switched to the non-priority main power grid; when the priority main power grid returns to normal from the fault, the controller automatically returns to the configuration of the priority main power grid; when both main networks fail, the main network in the controller configuration is in a failure state. Reliable interlocking and anti-bouncing functions: on the basis of strengthening interlocking of two control cross normally closed points, the design of separately connecting the change-over switches in parallel is adopted, so that reliable interlocking and priority branch control are ensured, and the possibility of jumping of a two-circuit after the device is electrified is completely avoided.

From the logic flow inside the main network controller, the above process is completely the case of a single-circuit main network configuration, the auxiliary circuit directly faces the two main networks and provides the main network controller with information after the switching process.

The utility model has the advantages that:

(1) the intelligent control system design is adopted to realize that two main power networks are configured according to a single main power network structure, so that a complex system is simplified;

(2) the control system of the double-main-grid power station is miniaturized, an intelligent processing design is added, the control is efficient and reliable, the structure is simple, and high performance and low cost are realized;

(3) the state detection and judgment of the two main power networks are processed by an external intelligent circuit, so that the logic programming requirement space of the main power network controller is remarkably reduced;

(4) and the device is matched with a main power network controller, a simple and reliable automatic switching circuit design is provided, reliable state feedback interlocking and priority branch control are ensured, and the possibility of two-circuit jumping after the device is powered on is completely avoided.

The present invention will be further explained with reference to the drawings and examples.

Drawings

Fig. 1 is a wiring diagram of intelligent configuration control of a dual main power network according to an embodiment of the present invention;

fig. 2 is a diagram of an auxiliary circuit for monitoring the state of a dual main power network according to an embodiment of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Examples

The double-main-grid intelligent configuration control system comprises a main grid controller with a CANbus communication interface, wherein the main grid controller consists of a main module and a display screen, and the main module is connected with the display screen through a special data line; a changeover switch ZK; electronic voltage relays Y1 and Y2; contactors KM1 and KM 2; a set of storage batteries; a battery charger BC; an ac power inlet switch Q0; main grid on/off relays SR and OR; a set of fuses FU; a set of backup relays; external interface terminal rows, etc.

All the above-mentioned components are integrated in a control panel device with door lock.

The electrical connection scheme of the above structure is as follows (refer to fig. 1 and 2):

first, as shown in fig. 1:

(1) the utility model discloses control system is as follows to the measurement monitoring interface of power station main electric wire netting: the output of a secondary side fuse of a first main power grid voltage transformer PT1 is connected to the main power grid voltage sampling input end of a main power grid controller through a first group of normally open main contacts of a contactor KM 1; the secondary side fuse output of a second main grid voltage transformer PT2 is connected to the main grid voltage sampling input of the main grid controller through a first group of normally open main contacts of a contactor KM 2. A measuring module of the electronic voltage relay Y1 samples a voltage transformer PT1 of the first main power grid; the measuring module of the electronic voltage relay Y2 samples the voltage transformer PT2 of the second mains grid. A first normally open control point of the contactor KM1 is connected with a first normally open point of a main power grid switching-on relay SR in series and then outputs a switching-on control signal serving as a first main power grid breaker M1; and a first normally open control point of the contactor KM2 is connected with a second normally open point of the main power grid closing relay SR in series and then outputs a closing control signal serving as a second main power grid breaker M2.

(2) The measurement monitoring interface of the control system to the main bus of the power station is as follows: the output of a secondary side fuse of a first main bus voltage transformer PT3 is connected to the main bus voltage sampling input end of a main power grid controller through a second group of normally open main contacts of a contactor KM 1; the secondary side fuse output of the second main bus voltage transformer PT4 is connected to the main bus voltage sampling input of the main power network controller through the second set of normally open main contacts of the contactor KM 2.

(3) The main network controller is otherwise wired as follows: the storage battery pack is connected with a working power supply terminal of the main power network controller through a fuse; the external connection of a relay SR coil is connected with a normally open output point of an internal relay R2 for controlling the closing of the main power grid; the normally open output point of the internal relay R1 is connected to the signal input point of the closing position of the main power grid through an external connecting line, and the normally closed output point of the R1 is connected to the signal input point of the opening position of the main power grid through an external connecting line; inputting a switching value signal: a second normally-open control point of the contactor KM1, a second normally-open control point of the contactor KM2, an auxiliary normally-open point of a first main power grid circuit breaker M1, an auxiliary normally-open point of a second main power grid circuit breaker M2 and an auxiliary normally-open point of a bus tie circuit breaker M0 are respectively connected to a switching value signal input point of the main power grid controller; the internal relay R3 is normally open and the output point is externally connected with a relay OR coil (for standby and used according to the actual needs of users) under the control of the main grid opening; the main power network controller is connected with the loop of each generator set controller of the power station through a CANbus protocol communication cable.

Second, as shown in fig. 2:

(1) the automatic main power grid state identification switching auxiliary circuit is connected as follows: the circuit working power supply is taken from the fuse protection output of the storage battery pack; the normally open point of the electronic voltage relay Y1, the normally closed point of the electronic voltage relay Y2, the normally closed control point of the contactor KM2 and the coil of the contactor KM1 are sequentially connected and then connected between a working power supply V + and a working power supply V-, and a left 45-degree turn-on point 1-2 of a change-over switch ZK is connected in parallel with a series loop of the normally closed point of the electronic voltage relay Y2 and the normally closed control point of the contactor KM 2; the normally open point of the electronic voltage relay Y2, the normally closed point of the electronic voltage relay Y1, the normally closed control point of the contactor KM1 and the coil of the contactor KM2 are sequentially connected and then connected between a direct-current power supply V + and a direct-current power supply V-, and a 45-degree switch-on point 3-4 at the right side of a change-over switch ZK is connected in parallel with a series loop of the normally closed point of the electronic voltage relay Y1 and the normally closed control point of the contactor KM 1; the power supply modules of the electronic voltage transformers Y1 and Y2 are connected between the direct current power supplies V + and V-; the loop direct current working power supply adopts a fuse protector for protection.

(2) Connecting a direct current power supply working power supply: the commercial power auxiliary alternating current power supply is connected with a battery charger BC through a switch Q0, the battery charger BC charges a storage battery pack through a charging circuit, and the storage battery pack provides a working power supply for the control system.

The data for the application system and device model selection of this example are as follows: the voltage level of a main grid system is 35kV, and a voltage transformer PT measures the transformation ratio by adopting the line voltage of 35/0.11 kV; the technical selection of key elements and other elements is as follows:

a main electric network controller: DEIF/AGC 4-G5-N-A1-J1-Y4 (Mains);

electronic voltage relay Y1/Y2: Schneider/RM 4-UA33MW, sampling measurement AC110V, and working power supply DC 24V;

contactor KM1/KM 2: LC1D09BDC DC24V + LADN20C 3pc, and 6 main contacts and 2 groups of normally open and normally closed control points are configured;

switching-on and switching-off control relay SR/OR: OMROM/MY 2 NJ-D2/DC 24V;

reversible change-over switch ZK: K1B-011 UC/unipolar/no zero position;

miniature circuit breaker Q0: rated 6A/AC220V two poles;

a storage battery: 20Ah/12V 2;

charger BC: AC220V/DC 24V/MAX.3A;

fuse set FU: the base ABB/E91/32 is matched with the fusible core 2A-16A according to the requirements of an alternating current and direct current circuit.

According to the hardware system and the wiring, the corresponding programming is carried out by using DEIF USW3341 application software (the version number is not lower than ver.3.34.1), and the software is installed in the main power network controller. The logical programming requirements of the main network controller are as follows:

and when the voltage sampling input of the main power grid of the controller is normal, the main power grid is normal, otherwise, the main power grid fails. When the voltage sampling point input of the main bus of the controller is normal, the main bus is electrified, otherwise, the main bus is in a power failure state. When the switching value signal input KM1 is active, the first main grid is used as the controller configuration main grid, and the state of the internal relay R1 is determined by the switching value signal input point M1, that is: when the M1 signal is valid, the R1 normally open point is closed, and when the M1 signal is invalid, the R1 normally closed point is closed; the operation process of the synchronization detection of the grid connection of the power station unit, which is returned to be normal by the main power grid, is carried out aiming at the first main power grid. When the switching value signal input KM2 is active, the second main grid is used as the controller configuration main grid, and the state of the internal relay R1 is determined by the switching value signal input point M2, that is: when the M2 signal is valid, the R1 normally open point is closed, and when the M2 signal is invalid, the R1 normally closed point is closed; and the synchronous detection operation process of the grid connection of the power station unit, in which the main power grid returns to normal, is carried out aiming at the second main power grid. When the main power grid returns to normal and the unit regulation reaches the synchronous condition, the normally open output point of the relay R2 in the controller acts to close and drive the external closing relay SR; the actual main grid breaker M1 or M2 performing the contemporaneous operation is selected by the KM1 or KM2 state. When the controller switching value signal inputs KM1 and KM2 are both invalid, the main power grid in the controller configuration is in a fault state; the auxiliary circuit was designed to be impossible to be effective at the same time with KM1 and KM2 with a reliable interlocking function. The priority configuration main power grid is selectively determined by the auxiliary circuit transfer switch; after the two fault main grids return to be normal, the power station unit firstly performs a grid-connected process with the priority main grid, after synchronous switch-on is successful, a logic instruction is used for separating and disconnecting a connecting line of the grid-connected main grid, the connecting line is automatically switched to the other main grid for configuration in combination with the change of the grid structure into a logic condition, the controller still considers that the main grid is to be connected and enters a new grid-connected process, after the synchronous grid-connection is successful, the unit enters a shutdown program, and the system recovers a normal operation mode.

The auxiliary circuit functions are explained as follows:

The above disclosure is only for the purpose of illustrating particular embodiments of the present invention and is not intended to limit the invention. The technical solutions described in the embodiments can be modified by those skilled in the art, or some technical features can be replaced by equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Two main electric network intelligent configuration control system, its characterized in that: the main power network controller is composed of a main module and a display screen, and the main module is connected with the display screen through a special data line; the system also comprises a change-over switch ZK, electronic voltage relays Y1 and Y2, contactors KM1 and KM2, a group of storage batteries, a battery charger BC, an alternating current power supply incoming line switch Q0, main power grid on/off relays SR and OR, a group of fuses FU, a group of standby relays and an external interface terminal row.

2. The dual master grid intelligent configuration control system of claim 1, wherein: the output of a secondary side fuse of a first main power grid voltage transformer PT1 is connected to the main power grid voltage sampling input end of a main power grid controller through a first group of normally open main contacts of a contactor KM 1; the output of a secondary side fuse of a second main power grid voltage transformer PT2 is connected to the main power grid voltage sampling input end of the main power grid controller through a first group of normally open main contacts of a contactor KM 2; a measuring module of the electronic voltage relay Y1 samples a voltage transformer PT1 of the first main power grid; a measuring module of the electronic voltage relay Y2 samples a voltage transformer PT2 of the second main power grid; a first normally open control point of the contactor KM1 is connected with a first normally open point of a main power grid switching-on relay SR in series and then outputs a switching-on control signal serving as a first main power grid breaker M1; and a first normally open control point of the contactor KM2 is connected with a second normally open point of the main power grid closing relay SR in series and then outputs a closing control signal serving as a second main power grid breaker M2.

3. The dual master grid intelligent configuration control system of claim 1, wherein: the output of a secondary side fuse of a first main bus voltage transformer PT3 is connected to the main bus voltage sampling input end of a main power grid controller through a second group of normally open main contacts of a contactor KM 1; the secondary side fuse output of the second main bus voltage transformer PT4 is connected to the main bus voltage sampling input of the main power network controller through the second set of normally open main contacts of the contactor KM 2.

4. The dual master grid intelligent configuration control system of claim 1, wherein: the storage battery pack is connected with a working power supply terminal of the main power network controller through a fuse; the external connection of a relay SR coil is connected with a normally open output point of an internal relay R2 for controlling the closing of the main power grid; the normally open output point of the internal relay R1 is connected to the signal input point of the closing position of the main power grid through an external connecting line, and the normally closed output point of the R1 is connected to the signal input point of the opening position of the main power grid through an external connecting line; inputting a switching value signal: a second normally-open control point of the contactor KM1, a second normally-open control point of the contactor KM2, an auxiliary normally-open point of a first main power grid circuit breaker M1, an auxiliary normally-open point of a second main power grid circuit breaker M2 and an auxiliary normally-open point of a bus tie circuit breaker M0 are respectively connected to a switching value signal input point of the main power grid controller; the main power grid opening controls the normally open output point of the internal relay R3 to be externally connected with the relay OR coil; the main power network controller is connected with the loop of each generator set controller of the power station through a CANbus protocol communication cable.

5. The dual master grid intelligent configuration control system of claim 1, wherein: the circuit working power supply is taken from the fuse protection output of the storage battery pack; the normally open point of the electronic voltage relay Y1, the normally closed point of the electronic voltage relay Y2, the normally closed control point of the contactor KM2 and the coil of the contactor KM1 are sequentially connected and then connected between a working power supply V + and a working power supply V-, and a left 45-degree turn-on point 1-2 of a change-over switch ZK is connected in parallel with a series loop of the normally closed point of the electronic voltage relay Y2 and the normally closed control point of the contactor KM 2; the normally open point of the electronic voltage relay Y2, the normally closed point of the electronic voltage relay Y1, the normally closed control point of the contactor KM1 and the coil of the contactor KM2 are sequentially connected and then connected between a direct-current power supply V + and a direct-current power supply V-, and a 45-degree switch-on point 3-4 at the right side of a change-over switch ZK is connected in parallel with a series loop of the normally closed point of the electronic voltage relay Y1 and the normally closed control point of the contactor KM 1; the power supply modules of the electronic voltage transformers Y1 and Y2 are connected between the direct current power supplies V + and V-; the loop direct current working power supply adopts a fuse protector for protection.