Multi-power-station interconnection simulation test device and building method

Abstract

The invention discloses a multi-power-station interconnection simulation test device and a building method. The method comprises the following steps: S1, designing simulation components required by a multi-power-station interconnection simulation test by analyzing a topological structure of a multi-power-station interconnection system; s2, performing function design on the multi-power-station interconnection simulation test based on the function of the multi-power-station interconnection system; s3, analog components are integrated into a GGD standard cabinet body according to modular layout, and electrical connection and signal interaction are achieved through hard wiring and a communication bus; and S4, verifying control logic and communication reliability in each operation mode by simulating a mains supply fault signal and load change. According to the invention, the power supply reliability, the protection logic and the power distribution performance under the multi-power-station interconnection scene can be accurately verified.

Description

Technical Field

[0001] This document relates to the technical field of multi-power station interconnected simulation tests, and particularly to a multi-power station interconnected simulation test device and a building method thereof. Background Art

[0002] With the expansion of the scale and the improvement of the complexity of modern power systems, the multi-power station interconnected power supply and distribution technology has gradually become an important means to ensure the reliability of regional power supply. Traditional power supply and distribution systems mostly adopt the split operation mode, where each power station operates independently and supplies power through the switching between the commercial power and diesel generator sets. However, the existing technologies have significant deficiencies in multi-power station collaborative control, long-distance communication, and dynamic load management:

[0003] Low communication and switching efficiency: Existing systems rely on conventional cables or wireless communication, which are vulnerable to interference during long-distance transmission, resulting in delays in the switching between commercial power and diesel generator sets and affecting the continuity of power supply. Especially in the scenario of multi-power station interconnection, there is a lack of efficient communication protocols and synchronization mechanisms, making it difficult to achieve rapid fault isolation and power source switching.

[0004] Uneven power distribution: Traditional systems rely on manual intervention or simple priority strategies to distribute loads, making it difficult to dynamically respond to load changes, easily leading to overload or redundant operation of some generator sets and reducing the overall energy efficiency.

[0005] Limitations of simulation test devices: Existing simulation devices mostly use real high-voltage equipment, which is costly and has potential safety hazards, and cannot flexibly simulate complex working conditions (such as multi-power station parallel connection, long-distance synchronization). In addition, there is a lack of an integrated control logic verification platform, making it difficult to comprehensively test the reliability of the interconnected system.

[0006] In response to the above problems, the existing technologies have not proposed a solution that can efficiently simulate the multi-power station interconnected scenario and achieve intelligent power management and rapid fault response. Therefore, there is an urgent need for a simulation test device with low cost, high safety, and support for multiple operation modes to provide a reliable technical verification means for actual engineering deployment. Summary of the Invention

[0007] The present invention aims to provide a multi-power station interconnected simulation test device and a building method thereof, which can simulate various operation modes of a multi-power station interconnected power supply and distribution system, verify the feasibility of related technologies, including functions such as logical control of various operation modes, long-distance communication, control of bus coupler switchgear, and status display and power management of diesel generator sets, and provide a reliable test platform for the design, optimization, and improvement of multi-power station interconnected systems.

[0008] According to an embodiment of the present invention, a method for building a multi-power station interconnected simulation test device is provided, including:

[0009] S1. Design the simulation components required for the multi-power-station interconnected simulation test by analyzing the topological structure of the multi-power-station interconnected system;

[0010] S2. Conduct functional design for the multi-power-station interconnected simulation test based on the functions of the multi-power-station interconnected system;

[0011] S3. Integrate the simulation components into the GGD standard cabinet in a modular layout, and achieve electrical connection and signal interaction through hard wiring and communication buses;

[0012] S4. Verify the control logic and communication reliability under various operating modes by simulating the municipal power failure signal and load changes.

[0013] According to the embodiments of the present invention, a multi-power-station interconnected simulation test device is provided, including:

[0014] The bus-coupler cabinet simulation panel, which is internally provided with 2 bus-coupler controllers, 1 touch screen, a PLC module and 28 groups of relays, and is used for simulating the closing and opening logic of the high-voltage bus-coupler switch and displaying system parameters;

[0015] The power station system simulation panel, which is configured with 8 diesel generator set controllers, CAN fiber converters and 18 groups of relays, and is used for simulating the unit control and status feedback of the power supply units in Area A and Area B;

[0016] The communication system, which realizes data interaction between the PLC, the touch screen and the controller through a switch and an Ethernet interface.

[0017] By adopting the embodiments of the present invention, the following beneficial effects are achieved:

[0018] The simulation test device and construction method of the present invention can comprehensively simulate various operating modes of the multi-power-station interconnected power supply and distribution system, provide an effective test means for researching the remote parallel operation and power distribution control technology of diesel generator sets with different capacities in power stations, and contribute to optimizing the design and operation strategy of the multi-power-station interconnected system. Through the verification of key technologies, such as long-distance communication and bus-coupler switchgear control, the reliability and stability of the multi-power-station interconnected system are improved, and the risks in practical applications are reduced. The device adopts a simplified design, uses controllers and relays with simulation functions to replace some real devices, reduces the test cost, and improves the safety and operability of the test. It has various function display and operating mode switching functions, which is convenient for operators to intuitively understand the system operating status, discover and solve problems in a timely manner, and improve the test efficiency. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in one or more embodiments of this specification or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments recorded in this specification. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0020] Figure 1 Flowchart of the method for building a multi-power-station interconnected simulation test device according to an embodiment of the present invention;

[0021] Figure 2 Operation logic block diagram of a multi-power-station interconnected power supply and distribution system according to an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the working process of the independent operation mode of each power station according to an embodiment of the present invention;

[0023] Figure 4 Working process of the multi-power-station interconnected operation mode according to an embodiment of the present invention;

[0024] Figure 5 Simplified design schematic diagram of the generator set and circuit breaker according to an embodiment of the present invention;

[0025] Figure 6 Simplified design schematic diagram of the diesel generator-mother connection device and the mains-mother connection device according to an embodiment of the present invention;

[0026] Figure 7 Simplified design schematic diagram of the mains outgoing cabinet / diesel generator outgoing cabinet / mother connection switch cabinet according to an embodiment of the present invention;

[0027] Figure 8 Schematic diagram of multi-power-station interconnected power transmission of the simulation device according to an embodiment of the present invention;

[0028] Figure 9 Schematic diagram of line protection of the high-voltage cabinet of the simulation device according to an embodiment of the present invention;

[0029] Figure 10 Schematic diagram of the application mode of the unit controller and the mother connection controller according to an embodiment of the present invention;

[0030] Figure 11 Schematic diagram of the communication loop of the simulation device according to an embodiment of the present invention;

[0031] Figure 12 Schematic diagram of the structure of the simulation device according to an embodiment of the present invention;

[0032] Figure 13 Schematic diagram of the structural layout of the mother connection cabinet simulation panel according to an embodiment of the present invention;

[0033] Figure 14 This is a schematic diagram of the structure layout of the power station system simulation screen according to an embodiment of the present invention;

[0034] Figure 15 A network diagram showing the main components of the simulation device according to an embodiment of the present invention;

[0035] Figure 16 This is a schematic diagram of the primary circuit of a multi-station interconnection simulation test device according to an embodiment of the present invention;

[0036] Figure 17 This is a schematic diagram of the flow chart of the separate operation modes of each power station according to an embodiment of the present invention;

[0037] Figure 18 This is a schematic diagram of the mains power connection operation process according to an embodiment of the present invention;

[0038] Figure 19 This is a schematic diagram of the diesel-generator set coordinated operation flow according to an embodiment of the present invention;

[0039] Figure 20 This is a communication diagram of a diesel generator set controller of a simulation device according to an embodiment of the present invention;

[0040] Figure 21 This is a schematic diagram of the diesel-generator busbar control logic of an embodiment of the present invention;

[0041] Figure 22 A schematic diagram of touch screen communication according to an embodiment of the present invention;

[0042] Figure 23 A schematic diagram of setting an application mode of a unit controller software tool according to an embodiment of the present invention;

[0043] Figure 24 Schematic diagram of the generator set operating mode indication according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below in conjunction with the drawings in one or more embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this document.

[0045] First, the current power supply and distribution system is introduced. The power supply and distribution system is divided into two power supply and distribution units, namely Area A and Area B. Each power supply and distribution unit consists of two independent power sources, namely the commercial power and the diesel generator set. The power supply systems are connected through the high-voltage bus-tie switchgear, long-distance communication is achieved through optical fibers (when the distance is far), and the high-voltage switch logic control between systems is achieved through control lines. The operation logic block diagram of the multi-power station interconnected power supply and distribution system is as shown in Figure 2 shown.

[0046] Each power supply system operates independently. When the commercial power is normal, the load is powered by the commercial power; when the commercial power is abnormal, the commercial power incoming switchgear trips, the generator set starts and closes the switch, and the power supply is switched to the diesel generator set; after the commercial power is restored, the generator set opens the switch and shuts down, and the commercial power incoming circuit breaker closes to supply power. The switching between the commercial power and the unit power supply can be carried out manually or automatically. The working process of the independent operation mode of each power station is shown in Figure 3 shown.

[0047] When the power supply systems of each power station are interconnected and operated, the commercial power is given priority for power supply. After a fault occurs in the commercial power of one of the power supply systems, the commercial power incoming circuit breaker of this system trips, and the commercial power bus-tie switch between the power supply systems closes, and the load is powered by the commercial power of the other power supply system. If both commercial power supplies fail, the diesel generator set of the power station with a higher set priority is used for power supply, the diesel generator set bus-tie switch between the power supply systems closes, and power is supplied to the load. If the load power is greater than the total output power of the diesel generator set of this power station, the diesel generator set of another power station is started for remote parallel power supply. The working process of the multi-power station interconnected operation mode is shown in Figure 4 shown.

[0048] The number of operating units of the diesel generator sets in each power station can be automatically increased or decreased according to the load demand, or can be manually put into or withdrawn from the unit in real time without affecting the normal operation of other units. After the unit is put into the system, the system automatically adjusts the load to achieve balanced distribution. After receiving the withdrawal instruction, the system automatically unloads the load, and when the set lower limit value is reached, it automatically disconnects and executes the shutdown procedure. Based on the existing power supply system, a multi-power station interconnected simulation test device and a building method are provided to simulate the operation of the power supply system.

[0049] After analyzing the functions and performance indicators of the multi-power station interconnected power supply and distribution system, the relevant equipment and components are simplified in design. The simulation device takes the generator set controller, the bus-tie controller, and the touch screen as the core, and combines components such as PLC, switch, and relay for functional design, and completes the building of the simulation device with a reasonable structural design and a matching software design. The multi-power station interconnected simulation test building method in the embodiment of the present invention specifically includes: component simplification design, functional design, structural design, and software design.

[0050] Method Embodiment

[0051] According to an embodiment of the present invention, a method for building a multi-power-station interconnected simulation test device is provided. Figure 1 It is a schematic diagram of the method for building a multi-power-station interconnected simulation test device according to an embodiment of the present invention. According to Figure 1 As shown, the method for building a multi-power-station interconnected simulation test device according to an embodiment of the present invention specifically includes:

[0052] S1. Analyze the topological structure of the multi-power-station interconnected system to design the simulation components required for the multi-power-station interconnected simulation test;

[0053] In a specific implementation of an embodiment of the present invention, there are 5 units in the power supply unit in area A and 3 units in the power supply unit in area B in the power supply and distribution system. Each unit is generally composed of 1 controller, 1 output circuit breaker, and 1 cabinet, etc. When building a simulation device, a simplified design can be carried out for the power supply unit. Figure 4 It is a flowchart of the method for building a multi-power-station interconnected simulation test device according to an embodiment of the present invention.

[0054] First, analyze the topological structure of the multi-power-station system and then carry out a simplified design of the components. Specifically as follows:

[0055] (1) Simplified design of the generator set and the circuit breaker: When building the multi-power-station interconnected simulation test device according to an embodiment of the present invention, an AGC-4 controller with simulation function is selected to replace the real generator set and controller. The AGC-4 controller has a powerful simulation function and can simulate the start, operation, closing, tripping, parallel connection, etc. of the generator set, and can truly output programmable signals through the controller output port. The overcurrent and instantaneous trip protection of the circuit breaker are mature technologies and do not involve the functional requirements of this time. The simulation device mainly verifies the closing and opening functions of the circuit breaker. Therefore, when building the multi-power-station interconnected simulation test device according to an embodiment of the present invention, a relay is used to replace the circuit breaker to verify the line on-off function. The simplified design of the generator set and the circuit breaker is shown in Figure 5 ;

[0056] (2) Simplified design of the diesel generator set bus-tie device and the utility power bus-tie device: The main components of the diesel generator set bus-tie device are the bus-tie controller and the circuit breaker. The control function of the diesel generator set bus-tie device is simulated by controlling the relay through the bus-tie controller. The utility power bus-tie device is generally controlled by the comprehensive protection device of the high-voltage cabinet to realize the bus-tie switch. The simulation device mainly simulates the closing and opening sequence logic of the bus-tie switch, and uses a PLC and a relay to complete the control function of the utility power bus-tie device. The simplified design of the diesel generator set bus-tie device and the utility power bus-tie device is shown in Figure 6 ;

[0057] (3) Simplified design of the mains power outlet cabinet / diesel generator outlet cabinet / bus-coupler switchgear: The mains power and mechanical power within the power supply unit have their own independent busbars, which are connected by the bus-coupler switchgear. Only two switches of the mains power outlet cabinet, diesel generator outlet cabinet, and bus-coupler switchgear are allowed to be closed. The control of this function is completed by the comprehensive protection device in the high-voltage cabinet, mainly simulating the closing and opening sequence control of the switches. After the simplified design, this function is completed by the cooperation of the PLC and the relay. For the simplified design of the mains power outlet cabinet / diesel generator outlet cabinet / bus-coupler switchgear, see Figure 7 ;

[0058] (4) Simplified design of the power supply line and power source: The power supply line of the lower-level substation is a conventional and mature design. Each substation can be regarded as a load device, and 1 indicator light is used in the simulation device to simulate one substation. Since the mains power and the generator set power source are 10 kV high-voltage power sources, which are not suitable for direct application in the simulation device, a safer DC24V (composed of 2 series-connected storage batteries) is used as the mains power and the unit power source. After the simplification, it can effectively protect personal safety and facilitate the function test of the simulation device.

[0059] In summary, in the embodiments of the present invention, a controller with a simulation function is used as the simulation component of the mains power unit and the mains power controller; a controller with a simulation function is used as the simulation component of the diesel generator set and the diesel power controller; a relay is used as the simulation component of the mains power circuit breaker; a relay is used as the simulation component of the diesel power circuit breaker; a PLC and a relay are used as the simulation component of the mains power bus-coupler device; a bus-coupler controller and a relay are used as the simulation component of the diesel generator bus-coupler device; a PLC and a relay are used as the simulation component of the mains power outlet cabinet; a PLC and a relay are used as the simulation component of the mechanical and electrical outlet cabinet; a PLC and a relay are used as the simulation component of the bus-coupler switchgear.

[0060] S2. Based on the functions of the multi-station interconnection system, the function design of the multi-station interconnection simulation test is carried out. S2 is specifically as follows:

[0061] (1) Carry out the function design of multi-station interconnection power supply, Figure 9 is the schematic diagram of multi-station interconnection power transmission of the simulation device in the embodiments of the present invention;

[0062] Taking Figure 9 as an example, the simulation function design of mains power supply is carried out: The simulation device controls the on-off of the mains power bus-coupler switch (relay) of Substation 1#-1 and the mains power bus-coupler switch (relay) of Substation 2#-1 through the logic control program of the mains power bus-coupler control device (PLC), and the simulation test of the interconnection and mutual supply function of the two mains power circuits can be realized.

[0063] Design the power supply simulation function of the diesel generator set: The simulation device controls the on / off of the diesel generator set bus tie switch (relay) of Substation 1#-1 and the municipal power supply bus tie switch (relay) of Substation 2#-1 through the bus tie controller, and can realize the simulation test of the interconnected power supply function of the two-way municipal power supply. Information is exchanged between the bus tie controllers and between the controllers through CAN communication. Through simulation, the interconnected power supply function of multiple power stations in various situations can be simulated.

[0064] (2) Design the line protection function, Figure 10 Schematic diagram of the line protection of the high-voltage cabinet of the simulation device for the embodiment of the present invention; Figure 11 Schematic diagram of the application mode of the unit controller and the bus tie controller for the embodiment of the present invention;

[0065] The line protection function of the high-voltage switch cabinet is mainly overcurrent and instantaneous trip protection, which belongs to mature technology. Generally, it has the main protection of the circuit breaker and the backup protection of the comprehensive protection device. The simulation device uses PLC and relays to cooperate to complete overcurrent and instantaneous trip protection. The PLC collects the simulated current signal of the controller. When the current is greater than a certain value, it controls the relay coil to disconnect, so as to realize the simulation of overcurrent and instantaneous trip protection functions.

[0066] The bus tie controller and the unit controller exchange information through CAN communication. The controller has alarm functions such as overcurrent, busbar over / under voltage, unbalanced voltage, unbalanced current, over / under excitation or reactive power input, busbar over / under frequency, auxiliary power supply voltage low / high, bus tie switch trip, synchronization failure alarm, bus tie switch opening failure alarm, bus tie switch closing failure alarm, switch position error, phase sequence error, etc.

[0067] (3) Design the manual and remote control modes of the bus tie, specifically including:

[0068] The bus tie controller in the high-voltage cabinet of the tie line has manual and automatic (remote control) working modes. In the manual working mode, the bus tie controller is set to the "manual" mode, and the bus tie switch can be operated to close and open through the panel buttons. The bus tie controller automatically detects whether the upper and lower busbars of the bus tie switch are in synchronization, and sends it to the controller of the generator set through CAN communication, and it adjusts the voltage and speed of the generator set to make the busbars in synchronization. After the busbars are in synchronization, the bus tie switch automatically closes. Operating the panel buttons again, the bus tie switch can open.

[0069] In the remote control working mode, the bus tie controller in the high-voltage cabinet of the tie line is set to the "automatic" mode. The bus tie controller automatically receives the external input contact signal, automatically detects whether the upper and lower busbars of the bus tie switch are in synchronization, and sends it to the controller of the generator set through CAN communication, and it adjusts the voltage and speed of the generator set to make the busbars in synchronization. After the busbars are in synchronization, it automatically controls the bus tie switch to close. After the external input contact signal disappears, it automatically controls the bus tie switch to open.

[0070] (4) Design the communication function, specifically including:

[0071] CAN communication is used between the diesel generator set controllers, which has high reliability. At the same time, an Ethernet communication interface is reserved. The touch screen and PLC both reserve Ethernet interfaces. Through the switch, the information exchange between the unit controller, touch screen and PLC can be realized by using the Ethernet communication method. The schematic diagram of the communication loop of the simulation device is as Figure 12 shown.

[0072] (5) Design the parallel connection and power distribution control, specifically including:

[0073] The unit controller has the functions of parallel connection and power distribution control. One set of power stations can be set as the main power station to give priority to power supply. When the total output power reaches the rated value of the power station, another set of power stations is started to supply power in parallel. When the load is small and reaches the unit disconnection condition, the power station unit with lower priority is disconnected first.

[0074] (6) Design the operation mode of the interconnected system, specifically including:

[0075] The operation of the multi-power station interconnected system includes three modes: split operation, mains connection operation, and diesel generator set connection operation. By setting the "operation mode" selection switch of the power station on the simulation device touch screen, the three operation modes can be switched with each other.

[0076] a) Split operation mode

[0077] Each power station operates independently, and the circuit breakers of the mains and diesel generator connections are in the open state.

[0078] b) Mains connection operation mode

[0079] When the mains external power supply of a certain power station fails, the main incoming line breaker of the mains is tripped, the mains connection line breaker is closed, and the diesel generator connection line breaker is in the open state. The power station with the mains failure is powered by the mains external power supply of another power station through the mains connection line. In this mode, the interconnection of the mains can be realized.

[0080] c) Diesel generator set connection operation mode

[0081] When the mains external power supplies of both sets of power stations fail, the main incoming line breakers of each power station are tripped, and the mains connection line breaker is tripped. Set a certain power station to start the diesel generator set to supply power, the diesel generator connection line breaker is closed, and the units are automatically paralleled or disconnected according to the size of the power consumption load (the units of this power station are preferentially paralleled, and the units of other power stations are preferentially disconnected).

[0082] (7) Design the display function, specifically including:

[0083] The display function of the simulation device mainly focuses on touch - screen display, which is configured according to the specific number of units and voltage levels of the interconnected power stations; it displays the single - line diagram of the current power station interconnection relationship, the status of each unit in each power station, and the status of the bus - tie switch; at the same time, it can display the operating parameters of each unit and the parallel - operation parameters, etc. At the same time, the selected bus - tie controller has the following display functions: daily / weekly / monthly / total kWh meter; daily / weekly / monthly / total kVarh meter; circuit - breaker operation counter; custom display view function; command timer; event log and alarm log with real - time clock; programmable logic configuration tool, etc.

[0084] S3. Integrate the analog components into the GGD standard cabinet in a modular layout, and achieve electrical connection and signal interaction through hard - wiring and communication bus. S3 specifically includes:

[0085] The simulation device in the embodiment of the present invention is composed of a standard screen body formed by two GGD frames. The screen - body size is (width × depth × height): 800×800×2200mm, which are the bus - tie cabinet simulation screen and the power - station system simulation screen respectively. The two screen bodies are arranged side by side. The structural schematic diagram of the simulation device is as Figure 13 shown.

[0086] The bus - tie cabinet simulation screen mainly consists of a GGD screen body, 2 bus - tie controllers, 1 touch - screen, emergency stop buttons, indicator lights, working - mode switches, etc. The specific configuration and description are shown in Table 1. It mainly realizes the centralized display of the operating parameters of the power - supply system, and the simulation of the control, display, protection and other functions of the two bus - tie cabinets. At the same time, it can communicate with a remote computer to realize the remote control function of the simulation device. The screen body of the bus - tie cabinet simulation screen in the embodiment of the present invention is composed of GGD profiles welded together. The front and rear cabinet doors can be opened freely, which is convenient for operation and maintenance. The upper cabinet door and the lower cabinet door are provided with heat - dissipation ventilation openings; the upper cabinet door is provided with working indicator lights, bus - tie cabinet closing and opening indicator lights, bus - tie cabinet fault alarm indicator lights, etc.; on the upper part of the middle cabinet door, there are working - mode switching switches, touch - screens, emergency stop buttons, and on the lower part, there are display operation interfaces of 2 bus - tie controllers; the lower cabinet door is arranged as a nameplate installation area; component boards are arranged inside the cabinet, mainly assembling components such as PLC modules, relays, miniature circuit breakers, etc. Maintenance can be carried out by opening the cabinet door. Through reasonable structural layout, the bus - tie cabinet simulation screen is convenient to operate, with a user - friendly human - machine interface design, easy to use and easy to maintain. The structural layout schematic diagram of the bus - tie cabinet simulation screen panel is as Figure 14 shown, and Table 1 is the configuration and description of the bus - tie cabinet simulation screen in the embodiment of the present invention.

[0087] Table 1 Configuration and description of the bus - tie cabinet simulation screen

[0088]

[0089]

[0090] The simulation panel of the power station diesel generator system control cabinet in the embodiment of the present invention mainly consists of a GGD panel, 8 controllers, several indicator lights, relays, miniature circuit breakers, etc. (the information of the main components is shown in Table 2). It mainly realizes the simulation of the control, display, protection and other functions of the power supply unit simulation device in Area A and the power supply unit simulation device in Area B. The panel is composed of GGD profiles by welding, and the front and rear cabinet doors can be freely opened for convenient operation and maintenance. The upper cabinet door and the lower cabinet door are provided with heat dissipation vents; the upper cabinet door is provided with working indicator lights, generator combination closing and opening indicator lights, fault alarm indicator lights, etc.; on the upper part of the middle cabinet door, 3 controller display panels are provided to simulate the power supply unit simulation device in Area B, and on the lower part, 5 controller display panels are provided to simulate the power supply unit simulation device in Area A; the lower cabinet door is arranged as a nameplate installation area; component boards are arranged in the cabinet, mainly assembling components such as controller main control modules, relays, and miniature circuit breakers, and maintenance can be carried out by opening the cabinet door. Table 2 is the configuration and description of the simulation panel of the power station diesel generator system control cabinet in the embodiment of the present invention.

[0091] Table 2 Configuration and description of the simulation panel of the power station diesel generator system control cabinet

[0092]

[0093]

[0094] In a specific implementation of the embodiment of the present invention, the simulation device includes 5 diesel generator set controllers in the power supply unit of Area A and 3 diesel generator set controllers in the power supply unit of Area B. The controllers have simulation functions and can simulate the operation of the generator sets.

[0095] The simulation device is configured with a touch screen, 1 PLC module (including extended input and output modules), and several relays. The relays can simulate the on-off states of switches. The PLC can collect the on-off state signals of the relays and control the actions of the relays to simulate the closing and opening logic of high-voltage switches. The touch screen can read the information of the PLC and the controllers through Ethernet communication. After configuration programming, it can display the single-line diagram of the current power station interconnection relationship, the states of each unit in each power station and the state of the bus tie switch, as well as the parameter information of the operation of each controller.

[0096] The simulation device uses a 16-port switch and reserves a test computer interface. The test computer can change the parameters of the PLC, the touch screen and the controllers, or simulate various operating states of the power supply system by connecting to the switch through a network cable, which is convenient for verifying the functions and performance of the power supply system. The schematic diagram of the network built by the main components of the simulation device is as Figure 16 shown. The multi-power-station interconnection technology simulation test device consists of 1 bus tie cabinet simulation panel and 1 power station system simulation panel, and is mainly used for researching the remote parallel operation and power distribution control technology of diesel generator set power stations with different capacities, and the reliability analysis and verification of multi-power-station interconnection technology.

[0097] S4. Verify the control logic and communication reliability under each operating mode by simulating the utility power failure signal and load changes.

[0098] Verify the simulation device built in S3, mainly verify the feasibility of the technologies related to the interconnection and interoperability of the multi-power station interconnected power supply and distribution system, including the logical control of various operating modes, long-distance communication, the control of the bus-tie switchgear, etc. The schematic diagram of the primary circuit of the power supply system is as Figure 17 shown;

[0099] In a specific implementation of the embodiment of the present invention, the split operation mode test, the interconnected operation mode test, the diesel generator set connection operation mode test are respectively carried out, the long-distance CAN / fiber optic communication is verified, the long-distance parallel function of the diesel generator is verified, the bus-tie switch control test is carried out, the status display test of the diesel generator set is carried out, the operation mode switching test is carried out, and the operation mode switching test of the generator set inside the power station is carried out. Specifically as follows:

[0100] Carry out the test of the split operation mode: In the split operation mode, the power supply and distribution systems in Area A and Area B operate independently, and the breakers of the utility power and diesel generator connection lines (1-1AH2 / 2-1AH2 / 1-1AH5 / 2-1AH5) are in the off state.

[0101] The automatic mode control process of the power supply and distribution system in Area A is as follows:

[0102] When the utility power is normal, the utility power incoming cabinet (1-1AH1) is closed, the utility power outgoing cabinet (1-1AH3) is closed. At this time, the bus-tie cabinet (1-1AH6) is in the closed state, and the generator set output cabinet (1-1AH6) is in the off state. The utility power supplies power to the loads in Area A, and the generator set is in the standby state; after the utility power fails, the utility power incoming cabinet (1-1AH1) trips, and one or more generator sets start and close automatically (one or more of 1-DAH1 to 1-DAH1 close according to the load power), the diesel generator outgoing cabinet (1-1AH4) is closed, and the utility power outgoing cabinet (1-1AH3) is opened, switching to the diesel generator set for power supply; after the utility power is restored, the utility power incoming cabinet (1-1AH1) is closed, the diesel generator outgoing cabinet (1-1AH4) is opened, and the utility power outgoing cabinet (1-1AH3) is closed. The power supply system switches to the utility power supply, and the diesel generator sets open (1-DAH1 to 1-DAH1) and stop. The switching between the utility power and the generator set power can also be carried out manually or automatically. Verification conclusion: Set the unit controller of the simulation device to the simulation automatic mode, use the PLC to simulate the utility power failure signal, and verify that the automatic mode control process of the power supply system in Area A is consistent with the process Figure 1 and this control mode is feasible.

[0103] Carry out the verification of the multi-power station interconnected operation mode, specifically including:

[0104] Verify the grid-connected mode of the commercial power: In the grid-connected operation mode of the commercial power, when the external commercial power supply of a certain power station fails, the main incoming breaker of the commercial power trips, the grid-connected breaker of the commercial power closes, and the breaker of the diesel generator connection line is in the tripped state. The power station with the commercial power failure is powered by the external commercial power supply of another power station through the grid-connected line of the commercial power. In this mode, the interconnection and interoperability of the commercial power can be achieved.

[0105] a) The control process of the grid-connected operation mode of the commercial power is as follows:

[0106] 1) The power supply systems (commercial power) of Area A and Area B are interconnected and operate. The commercial power is given priority. When the commercial power supplies in both Area A and Area B are normal, the bus coupler cabinets of the commercial power (1-1AH2, 2-1AH2) and the bus coupler cabinets of the diesel generators (1-1AH5, 2-1AH5) are in the tripped state and closing is prohibited. If the commercial power in Area A fails, the incoming breaker of the commercial power (1-1AH1) trips, and the bus coupler cabinets of the commercial power (1-1AH2, 2-1AH2) close. If the closing of the bus coupler cabinets of the commercial power is successful, the commercial power in Area B supplies power to the loads in Area A and Area B. If the closing of the bus coupler cabinets of the commercial power fails, the generator set in Area A starts automatically and closes to supply power to the loads in Area A. If the commercial power in Area B fails, the incoming breaker of the commercial power (2-1AH1) trips, and the bus coupler cabinets of the commercial power (1-1AH2, 2-1AH2) close. The commercial power in Area A supplies power to the loads in Area A and Area B. If the closing of the bus coupler cabinets of the commercial power fails, the generator set in Area B starts automatically and closes to supply power to the loads in Area B. If both commercial power supplies fail, the incoming breaker of the commercial power (1-1AH1) trips, the incoming breaker of the commercial power (2-1AH1) trips, the bus coupler cabinets of the commercial power (1-1AH2, 2-1AH2) trip, the generator set in Area A starts automatically and closes to supply power to the loads in Area A, and the generator set in Area B starts automatically and closes to supply power to the loads in Area B.

[0107] 2) If the commercial power in Area A is restored, the incoming breaker of the commercial power (1-1AH1) closes, the bus coupler cabinets of the commercial power (1-1AH2, 2-1AH2) close, and the outgoing breakers of the diesel generators 1-1AH4 / 2-1AH4 trip. At this time, if the outgoing breaker of the commercial power 1-1AH3 closes successfully, the commercial power in Area A supplies power to the loads in Area A. If the closing of the outgoing breaker of the commercial power 1-1AH3 fails, the generator set in Area A continues to supply power to the loads in Area A. If the outgoing breaker of the commercial power 2-1AH3 closes successfully, the commercial power in Area A supplies power to the loads in Area B. If the closing of the outgoing breaker of the commercial power 2-1AH3 fails, the generator set in Area B continues to supply power to the loads in Area B. If both the outgoing breakers of the commercial power 1-1AH3 and 2-1AH3 close successfully, the commercial power in Area A supplies power to the loads in Area A and Area B.

[0108] 3) If the mains power in Area B is restored, the mains power incoming switchgear (2-1AH1) closes, the mains power bus-tie switchgear (1-1AH2, 2-1AH2) closes, and the diesel generator outgoing switchgear 1-1AH4 / 2-1AH4 opens. At this time, if the mains power outgoing switchgear 1-1AH3 closes successfully, the mains power in Area B supplies power to the loads in Area A. If the mains power outgoing switchgear 1-1AH3 fails to close, the generator set in Area A continues to supply power to the loads in Area A. If the mains power outgoing switchgear 2-1AH3 closes successfully, the mains power in Area B supplies power to the loads in Area B. If the mains power outgoing switchgear 2-1AH3 fails to close, the generator set in Area B continues to supply power to the loads in Area B. If both the mains power outgoing switchgear 1-1AH3 and 2-1AH3 close successfully, the mains power in Area B supplies power to the loads in Area A and Area B, and the generator sets in Area A and Area B open and shut down.

[0109] 4) If the mains power in both Area A and Area B is restored, the mains power incoming switchgear 1-1AH1 / 2-1AH1 closes, the mains power bus-tie switchgear (1-1AH2, 2-1AH2) opens, and the diesel generator outgoing switchgear 1-1AH4 / 2-1AH4 opens. At this time, if the mains power outgoing switchgear 1-1AH3 closes successfully, the mains power in Area A supplies power to the loads in Area A, and the generator set in Area A opens and shuts down. If the closing fails, the generator set in Area A continues to supply power to the loads in Area A. At this time, if the mains power outgoing switchgear 2-1AH3 closes successfully, the mains power in Area B supplies power to the loads in Area B, and the generator set in Area B opens and shuts down. If the closing fails, the generator set in Area B continues to supply power to the loads in Area B.

[0110] b) Verification method:

[0111] 1) Set the unit controller of the simulation device to the simulation automatic mode.

[0112] 2) Mains power incoming circuit breaker: In case of mains power failure (voltage loss), it trips automatically.

[0113] 3) Set the control logic of the mains power bus-tie switchgear (1-1AH2, 2-1AH2) as follows: In this mode, when both incoming switchgears of the two mains power lines are closed or open, the mains power bus-tie switchgear is prohibited from closing. When any one of the incoming switchgears of the mains power lines closes, the mains power bus-tie switchgear closes.

[0114] In this mode, the diesel generator bus-tie switchgear (1-1AH5, 2-1AH5) is prohibited from closing.

[0115] Simulate the mains power failures in Area A and Area B respectively in the automatic mode.

[0116] Verification conclusion: The control process is consistent with the process Figure 1 and this control mode is feasible.

[0117] Verify the diesel generator set connection operation mode: In the diesel generator set connection operation mode, when the main power supplies of both power stations fail, the main incoming circuit breakers of each power station will trip, and the circuit breaker of the main power connection line will trip. Set a certain power station's diesel generator set as the main power station to start and supply power preferentially. The circuit breaker of the diesel generator connection line will close. According to the size of the power consumption load, the units will automatically be paralleled or disconnected (the units of the main power station will be preferentially paralleled, and the units of the slave power station will be preferentially disconnected).

[0118] The diesel generator set connection operation mode adds the interconnection of generator sets on the basis of the interconnection of the main power supplies. In this mode, the unit bus coupler controller is in the closed state. When a power station in Area A or Area B has a main power failure, the operation process of the power supply system is the same as that of the main power connection operation mode.

[0119] In this system, the units in Area A are set as the main station. In the automatic mode, if all three units in Area A have been started, according to the logic set inside the controller, the other two units will be automatically prohibited from starting (using three units for backup and two units in operation). At this time, if the load still increases, the generator sets in Area B will automatically start.

[0120] If the main power supply in Area A fails, the main power incoming switchgear (1-1AH1) will trip, and the main power bus coupler switchgear (1-1AH2, 2-1AH2) will close. If the main power bus coupler switchgear closes successfully, the main power supply in Area B will supply power to the loads in Area A and Area B. If the main power bus coupler switchgear fails to close, the main station units will automatically start and close to supply power to the loads in Area A; if the main power supply in Area B fails, the main power incoming switchgear (2-1AH1) will trip, and the main power bus coupler switchgear (1-1AH2, 2-1AH2) will close. The main power supply in Area A will supply power to the loads in Area A and Area B. If the main power bus coupler switchgear fails to close, the main station units will automatically start and close to supply power to the loads in Area B; if both main power supplies fail, the main power incoming switchgear (1-1AH1) will trip, the main power incoming switchgear (2-1AH1) will trip, and the main power bus coupler switchgear (1-1AH2, 2-1AH2) will open. The main station generator sets will automatically start and close to supply power to the loads in Area A and Area B. At this time, if the load increases to require 4 or 5 units to be paralleled for power supply, the slave station units will automatically start and be paralleled. If the load decreases to require less than 4 units to be paralleled for power supply, the slave station units will automatically be disconnected and shut down.

[0121] If the mains power in Area A is restored, the mains power inlet cabinet (1-1AH1) closes, the mains power bus-coupler cabinet (1-1AH2, 2-1AH2) closes, and the unit outgoing line cabinet 1-1AH4 / 2-1AH4 opens. At this time, if the mains power outgoing line cabinet 1-1AH3 closes successfully, the mains power in Area A supplies power to the loads in Area A. If the mains power outgoing line cabinet 1-1AH3 fails to close, the unit continues to supply power to the loads in Area A. If the mains power outgoing line cabinet 2-1AH3 closes successfully, the mains power in Area A supplies power to the loads in Area B. If the mains power outgoing line cabinet 2-1AH3 fails to close, the unit continues to supply power to the loads in Area B. If both the mains power outgoing line cabinets 1-1AH3 and 2-1AH3 close successfully, the mains power in Area A supplies power to the loads in Area A and Area B, and the unit opens and shuts down.

[0122] If the mains power in Area B is restored, the mains power inlet cabinet (2-1AH1) closes, the mains power bus-coupler cabinet (1-1AH2, 2-1AH2) closes, and the unit outgoing line cabinet 1-1AH4 / 2-1AH4 opens. At this time, if the mains power outgoing line cabinet 1-1AH3 closes successfully, the mains power in Area B supplies power to the loads in Area A. If the mains power outgoing line cabinet 1-1AH3 fails to close, the unit continues to supply power to the loads in Area A. If the mains power outgoing line cabinet 2-1AH3 closes successfully, the mains power in Area B supplies power to the loads in Area B. If the mains power outgoing line cabinet 2-1AH3 fails to close, the unit continues to supply power to the loads in Area B. If both the mains power outgoing line cabinets 1-1AH3 and 2-1AH3 close successfully, the mains power in Area B supplies power to the loads in Area A and Area B, and the unit opens and shuts down.

[0123] If the mains power in both Area A and Area B is restored, the mains power inlet cabinets 1-1AH1 / 2-1AH1 close, the mains power bus-coupler cabinet (1-1AH2, 2-1AH2) opens, and the unit outgoing line cabinets 1-1AH4 / 2-1AH4 open. At this time, if the mains power outgoing line cabinet 1-1AH3 closes successfully, the mains power in Area A supplies power to the loads in Area A, and the unit in Area A opens and shuts down. If the closing fails, the unit continues to supply power to the loads in Area A. At this time, if the mains power outgoing line cabinet 2-1AH3 closes successfully, the mains power in Area B supplies power to the loads in Area B, and the unit in Area B opens and shuts down. If the closing fails, the unit continues to supply power to the loads in Area B. If both the mains power outgoing line cabinets 1-1AH3 and 2-1AH3 close successfully, the mains power in Area A supplies power to the loads in Area A, the mains power in Area B supplies power to the loads in Area B, and the unit opens and shuts down.

[0124] Verification conclusion: The control process is consistent with the process Figure 1 and this control mode is feasible.

[0125] Verify long-distance CAN / fiber optic communication as follows: CAN communication is used between the diesel generator set controllers. The signal loss of CAN communication is relatively large over long distances. To ensure the reliability of CAN communication between the simulation device controllers, the CAN-fiber optic-CAN communication method is adopted. Compared with twisted pair and coaxial cable, the low transmission loss of fiber optic increases the transmission distance significantly. In addition, the optical cable also has the characteristics of not radiating energy, not conducting electricity, and having no inductance. There is no crosstalk and interference between optical signals in the optical cable, and it has excellent anti-EMI and EMC characteristics. There will also be no safety problems caused by inductive coupling in the line, greatly improving the reliability and security of data communication. The communication scheme is feasible. The communication schematic diagram of the diesel generator set controllers of the simulation device is as Figure 23 shown. Through actual testing, two CAN / fiber optic modules are used in the simulation device to connect the CAN communication of the unit controllers in Area A and Area B.

[0126] Verify the long-distance parallel function of the diesel generator set, specifically including:

[0127] The parallel conditions for diesel generator sets are: the same voltage, frequency, and phase. In the engineering application of parallel diesel generator sets, generally one or more sets of units are switched on for power supply. Adjust the voltage of the unit to be paralleled to be the same as the bus voltage, and adjust the speed of the unit to be paralleled to be slightly faster than the unit that has been switched on for power supply to make the phase angle the same, so as to successfully achieve parallel operation.

[0128] The busbars between long-distance power stations are connected through the bus-tie switch. After the bus-tie switch is closed, each unit controller can collect the bus voltage. At the same time, the information of the generator set speed can be mutually confirmed through CAN communication between each controller, so that the system meets the parallel conditions. Through the simulation verification of the simulation device controller, the parallel connection between long-distance multiple power stations can be achieved.

[0129] The unit controller also has a power management function. After the units are successfully paralleled, the active power and reactive power are automatically balanced, and the consistency of voltage and speed is no longer emphasized. It can effectively avoid the influence of the voltage difference of the line between long-distance power stations and the influence of power distribution imbalance caused by the errors in the collection of speed and voltage between different power stations. Thus, the difference degree of active and reactive power distribution is stabilized at a relatively high value, and the difference degree of active and reactive power distribution is not greater than 3%.

[0130] After using the simulation device unit controller for simulation verification, the difference degree of active and reactive power distribution is not greater than 3%.

[0131] Control the bus-tie switch, specifically including:

[0132] Mains Power Bus-tie Cabinet Control: In the separated operation mode, the closing of the mains power bus-tie cabinet is prohibited; in the mains power connection operation mode, when both mains power supplies are normal, the bus-tie switch of the mains power bus-tie cabinet is in the open position. In case of a fault in any one of the two mains power supplies, the bus-tie switch of the mains power bus-tie cabinet closes; when both mains power supplies fail, the bus-tie switch of the mains power bus-tie cabinet opens; in the diesel generator set connection operation mode, the control logic of the mains power bus-tie cabinet is the same as that in the mains power connection operation mode.

[0133] The mains power bus-tie cabinet is equipped with a comprehensive protection device according to the conventional configuration. The closing signal forms an electrical interlock with the two mains power incoming cabinets (that is, at most two high-voltage closings are allowed among the A-area mains power incoming cabinet, the B-area mains power incoming cabinet, and the mains power bus-tie cabinet). At the same time, to ensure safety, a voltage loss relay is installed on the incoming side of the mains power incoming cabinet. When there is no mains power supply on the incoming side, it trips automatically and can be closed manually or automatically when there is mains power; voltage loss relays are installed on the incoming side and the outgoing side of the mains power bus-tie cabinet. When there is no voltage on both sides, it trips automatically.

[0134] Diesel Generator Set Bus-tie Cabinet Control: In the separated operation mode and the mains power connection operation mode, the closing of the generator set bus-tie cabinet is prohibited; in the diesel generator set connection operation mode, the bus-tie cabinet of the generator set is in the closed position. If both mains power supplies fail, the power station with a higher priority is started, and power management is automatically performed according to the load.

[0135] The bus-tie switch of the diesel generator set is controlled by a dedicated generator set bus-tie controller. The bus-tie controller can exchange information with the generator set controller through CAN communication. In the separated operation mode and the mains power connection operation mode, the bus-tie controller receives the input signal of the separated operation mode and locks the closing signal of the bus-tie switch cabinet (prohibits closing) through internal logic settings; in the diesel generator set connection operation mode, after receiving the signal, the bus-tie controller issues a closing command. If the bus-tie controller detects that there is no voltage signal at the output end of the bus at this time, the diesel generator bus-tie switch cabinet closes directly. If the bus-tie controller detects a voltage signal at the output end of the bus, it detects the power supply synchronization signal at both ends, and at the same time sends the speed regulation and voltage regulation signals to the corresponding generator set controllers to automatically synchronize the diesel generator sets of the two power stations. After the bus-tie controller detects that the power supplies on both sides are synchronized, it issues a closing command to close the bus-tie switch. At the same time, the generator set controller automatically adjusts the application mode to parallel operation of the diesel generator sets of multiple power stations. The bus-tie controller continuously detects the bus voltage of each standby power station. If there is a deviation, the speed regulation and voltage regulation signals should be sent to the corresponding generator set controllers to keep the output voltages of the diesel generator sets of the two power stations consistent.

[0136] The paralleling panel of the diesel generator set is equipped with a touch screen, which is connected to the switch via a network cable. The switch is connected to each unit controller, the touch screen and the PLC in the cabinet via network cables. The PLC receives the switch feedback signals of high-voltage cabinets such as the mains incoming cabinet and the mains outgoing cabinet through signal lines. After appropriate programming, the switch signals can be stored in the corresponding addresses. The touch screen reads the data information of each unit controller and the PLC in the cabinet through the Modbus communication protocol. Through appropriate configuration programming, the status information of each unit and the relevant high-voltage cabinet switches is displayed.

[0137] Perform operation mode switching, specifically including:

[0138] In actual projects, a mode switching control switch can be set on the diesel generator paralleling panel (or other appropriate positions). The switch has three gears: "split operation mode", "mains connection mode", and "diesel generator set connection operation mode". The operation mode information is sent to the mains bus coupler cabinet and the unit bus coupler cabinet through signal lines. The mains bus coupler cabinet and the unit bus coupler cabinet judge whether to close or open the switch based on the received operation mode information.

[0139] Generator set operation mode switching: The bus coupler cabinet of the unit is equipped with a bus coupler controller to control the bus coupler switches of the bus coupler cabinets (1-1AH5 and 2-1AH5), corresponding to Figure 23 BTB33 and BTB34 in the application mode of the corresponding unit controller. The generator set controller collects the opening and closing states of BTB33 and BTB34 through CAN communication and automatically switches the operation mode. When both BTB33 and BTB34 are closed, the generator sets in Area A and Area B automatically enter the parallel operation mode. Otherwise, the generator sets in Area A and Area B operate independently.

[0140] Perform operation mode switching of the generator sets inside the power station, specifically including:

[0141] Separate operation mode switching switches are set for the diesel generator sets in each power station. The mode switching includes five working modes: zero position, manual, automatic normal, and automatic emergency. The working mode signals are sent not only to the unit controller but also to the PLC in the paralleling panel. The PLC stores the signals in the corresponding addresses of the internal memory.

[0142] The PLCs in the paralleling panels of the generator sets in the two power stations are connected through communication lines, and each PLC reads the operation modes of the generator sets in the two power stations.

[0143] Perform logic programming on the PLC. In the connection operation mode of the diesel generator sets, if the operation modes of the generator sets in the two power stations are not unified, an alarm signal of "the operation modes of the generator sets in each power station are not unified" and the current operation mode information of each power station will be output. Perform configuration programming on the touch screen. By reading the PLC information, the operation modes of the generator sets in each power station are visually displayed.

[0144] By adopting the embodiments of the present invention, the following beneficial effects are achieved:

[0145] The simulation test device and construction method of the present invention can comprehensively simulate various operation modes of a multi-power station interconnected power supply and distribution system, providing an effective test means for studying the remote parallel operation and power distribution control technology of diesel generator set power stations with different capacities, and helping to optimize the design and operation strategies of the multi-power station interconnected system. By verifying key technologies such as long-distance communication and bus coupler switchgear control, the reliability and stability of the multi-power station interconnected system are improved, and the risks in practical applications are reduced. The device adopts a simplified design, using a controller with simulation functions and relays to replace some real devices, reducing the test cost, while improving the safety and operability of the test. It has various function displays and operation mode switching functions, which facilitate the operator to intuitively understand the system operation status, timely discover and solve problems, and improve the test efficiency.

[0146] Device embodiment

[0147] According to an embodiment of the present invention, a multi-power station interconnected simulation test device is provided, which is characterized in that it includes:

[0148] A bus coupler cabinet simulation panel, which is built-in with 2 bus coupler controllers, 1 touch screen, a PLC module and 28 groups of relays, and is used to simulate the closing and opening logic of the high-voltage bus coupler switch and display system parameters;

[0149] A power station system simulation panel, which is configured with 8 diesel generator set controllers, a CAN fiber optic converter and 18 groups of relays, and is used to simulate the unit control and status feedback of the power supply units in Area A and Area B;

[0150] A communication system, which realizes data interaction between the PLC, the touch screen and the controller through a switch and an Ethernet interface.

[0151] The bus coupler controller supports manual / auto dual modes:

[0152] In the manual mode, the bus coupler switch is operated through the panel buttons, and the bus synchronization status is automatically detected;

[0153] In the auto mode, the closing and opening are triggered by receiving an external signal, and the voltage regulation and speed regulation of the units are coordinated through CAN communication.

[0154] The diesel generator set controller has the following functions:

[0155] Simulate the start-up, parallel operation and disconnection operations of the generator sets;

[0156] Real-time collect bus voltage, frequency and phase data;

[0157] Automatically balance the active and reactive power distribution among multiple units through a power management algorithm.

[0158] The display function of the touch screen includes:

[0159] Dynamically display the single-line diagram of multi-power station interconnection and highlight the fault area;

[0160] Real-time display the output voltage, load rate of each unit and the status of the bus coupler switch;

[0161] Record and alarm events such as bus overvoltage, undervoltage, phase sequence error and communication interruption.

[0162] The embodiment of the present invention is a specific implementation of the above method embodiment. For the specific construction process, refer to the method embodiment and will not be elaborated here.

[0163] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for building a multi-power station interconnected simulation test device, characterized in that Including: S1. Design the simulation components required for the multi-power station interconnected simulation test by analyzing the topological structure of the multi-power station interconnected system; S2. Conduct functional design of the multi-power station interconnected simulation test based on the functions of the multi-power station interconnected system; S3. Integrate the simulation components into the GGD standard cabinet in a modular layout, and achieve electrical connection and signal interaction through hard wiring and communication buses; S4. Verify the control logic and communication reliability under various operating modes by simulating the mains power failure signal and load changes.

2. The method according to claim 1, wherein The simulation components for designing the multi-power station interconnected simulation test specifically include: Adopt a controller with simulation function as the simulation component for the mains power unit and the mains power controller; Adopt a controller with simulation function as the simulation component for the diesel generator set and the diesel power controller; Adopt a relay as the simulation component for the mains power circuit breaker; Adopt a relay as the simulation component for the diesel power circuit breaker; Adopt a PLC and a relay as the simulation component for the mains power bus tie device; Adopt a bus tie controller and a relay as the simulation component for the diesel power bus tie device; Adopt a PLC and a relay as the simulation component for the mains power outgoing cabinet; Adopt a PLC and a relay as the simulation component for the mechanical and electrical outgoing cabinet; Adopt a PLC and a relay as the simulation component for the bus tie switch cabinet.

3. The method according to claim 1, characterized in that The specific content of S2 includes: Design the multi-power station interconnected power supply function. Use the PLC in the simulation component of the mains power bus tie device to control the on-off of two relays to achieve the simulation test of the two-way mains power interconnection power supply for the mains power supply. Use the bus tie controller of the simulation component of the diesel power bus tie device to control the on-off of two relays to achieve the simulation test of the two-way mains power interconnection power supply for the diesel generator set; Design the line protection function, and complete the overcurrent protection, short-circuit protection and automatic locking logic of the bus tie switch cabinet through the cooperation of the PLC and the relay; Design the bus tie working mode, including manual mode and automatic mode; Design the communication function, realize the data interaction between the diesel generator set controllers through CAN communication, reserve the Ethernet interface and connect the unit controllers, touch screen and PLC through the switch; Design the parallel connection and power distribution control function, set the priority of the master and slave power stations, start parallel power supply when the total power exceeds the limit, and disconnect the units according to the priority when the load decreases; Design the operating mode of the interconnected system, including: set three modes of split operation, mains power connection operation, and diesel generator set connection operation; Design the display function, and display the system status, power distribution and fault alarm information in real time through the touch screen.

4. The method according to claim 1, wherein The specific content of S3 includes: The bus tie cabinet simulation screen integrates a touch screen, a bus tie controller, a PLC module and 28 groups of relays; The power station system simulation screen is configured with 8 diesel generator set controllers with simulation function; The cabinet adopts a design with front and rear openable doors, and is provided with heat dissipation vents and status indicators.

5. The method according to claim 1, wherein The specific content of S4 includes: Verify the automatic switching logic of the mains power and the diesel generator set in the split operation mode; Verify the automatic closing of the bus tie switch and the load transfer function when the mains power fails; Verify the power distribution accuracy of the parallel power supply of the diesel generator sets when both mains power circuits fail, and require that the difference in active and reactive power distribution is less than the preset percentage.

6. The method according to claim 1, characterized in that The analog component also includes using a DC 24V battery to replace the 10kV high-voltage power supply to simulate the power supply of the mains and diesel generator sets.

7. A multi-power-plant interconnected simulation test device based on the method for building a multi-power-plant interconnected simulation test device according to any one of claims 1-6, characterized in that, It includes: The bus-coupler cabinet analog panel, which is built-in with 2 bus-coupler controllers, 1 touch screen, a PLC module and 28 groups of relays, and is used to simulate the closing and opening logic of the high-voltage bus-coupler switch and display system parameters; The power station system analog panel, which is configured with 8 diesel generator set controllers, a CAN fiber converter and 18 groups of relays, and is used to simulate the unit control and status feedback of the power supply units in Area A and Area B; The communication system realizes data interaction between the PLC, touch screen and controller through a switch and an Ethernet interface.

8. The device according to claim 7, characterized in that, The bus-coupler controller supports manual / auto dual modes: In the manual mode, the bus-coupler switch is operated through the panel buttons, and the bus synchronization status is automatically detected; In the auto mode, it receives external signals to trigger closing and opening, and coordinates the voltage regulation and speed regulation of the units through CAN communication.

9. The device according to claim 7, characterized in that, The diesel generator set controller has the following functions: Simulating the start-up, parallel connection and disconnection operations of the generator sets; Real-time collecting bus voltage, frequency and phase data; Automatically balancing the active and reactive power distribution among multiple units through a power management algorithm.

10. The device according to claim 7, characterized in that, The display functions of the touch screen include: Dynamically displaying the interconnected single-line diagram of multiple power stations and highlighting the fault area; Real-time displaying the output voltage, load rate of each unit and the status of the bus-coupler switch; Recording and alarming events such as bus overvoltage, undervoltage, phase sequence error and communication interruption.

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