Distributed IO device for remotely monitoring medium-voltage motor of gas turbine

Abstract

A distributed IO (input / output) device for remotely monitoring a medium-voltage motor of a gas turbine comprises a controller, a switching value input module, a switching value output module, an analog input module, a terminal module and a power supply module, is mounted on a guide rail in a 10kV switch cabinet, and is characterized in that a water injection pump and a fuel pump share one set of distributed IO device; on one hand, the device is connected with a 10 kV switch cabinet I comprehensive protection device and a 10 kV switch cabinet II comprehensive protection device through hard wiring and communication lines, and meanwhile, the device accesses current and voltage information of a 10 kV switch cabinet I current transformer, a 10 kV switch cabinet II current transformer and a 10 kV bus voltage transformer in a hard wiring mode; on the other hand, the device establishes communication connection with a gas turbine control system Mark Vie in a communication mode. By adopting the device, the communication requirement of a gas turbine control system can be met, and the running state of the medium-voltage motor can be remotely monitored.

Description

Technical Field

[0001] The utility model belongs to the field of electrical system design of a combined cycle power station and relates to a distributed IO device for remote monitoring of a medium-voltage motor of a gas turbine. Background Art

[0002] In order to meet the construction requirements of digital power plants, the H-class gas turbine generator system of GE Company in the United States adopts full communication between the gas turbine control system Mark Vie and each controlled object to realize the remote monitoring and control functions of each device. Each gas turbine unit is equipped with 2 water injection pumps and 2 fuel pumps. These 4 pumps are monitored by the gas turbine control system Mark Vie. The communication protocols supported by MarkVie are Profibus DP and IEC61850. The motors of the water injection pump and the fuel pump are powered by a 10kV switch cabinet, which is equipped with a 10kV comprehensive protection device. The 10kV comprehensive protection device only supports the Modbus RTU communication protocol, but not the Profibus DP and IEC61850 protocols, which makes it impossible to communicate directly with the gas turbine control system. Summary of the invention

[0003] The purpose of the utility model is to provide a distributed IO device which can not only meet the communication requirements of the gas turbine control system, but also realize remote monitoring of the operating status of the medium voltage motor, while taking into account the rationality and economy of the equipment configuration.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A distributed IO device for remote monitoring of medium-voltage motors of gas turbines, characterized by comprising: a controller, a switch input module, a switch output module, an analog input module, a terminal module and a power module. The switch input module is connected to the 10kV switch cabinet (including the 10kV comprehensive protection device) by hard wiring, and collects the operation signals and abnormal alarm signals of the 10kV switch cabinet and the comprehensive protection device; the switch output module outputs the control command signal, which is connected to the comprehensive protection device in the 10kV switch cabinet by hard wiring, and these signals are used to start and stop the water injection pump motor and the fuel pump motor; the analog input module is used to measure the electrical quantity in the three-phase power grid, and calculate the active power, reactive power, apparent power, power factor, phase angle, and frequency according to the input voltage and current signals; the function of the terminal module is to form a complete internal data loop and ensure the accuracy of the data flow; the power module provides power for the distributed IO device; the data transmission between the controller and each module is completed through the built-in bus, and the controller is connected to the comprehensive protection device in the 10kV switch cabinet by communication, and collects other signals except the signals transmitted by hard wiring. The controller is also connected to the gas turbine control system Mark Vie establishes a communication connection, adopts ProfibusDP and IEC61850 communication protocols, uploads the information (including hard-wired information and information obtained by communication) received by the distributed IO device from the 10kV switch cabinet (including 10kV comprehensive protection device), and at the same time, receives the control command from the gas turbine control system and sends it to the comprehensive protection device in the 10kV switch cabinet through the switch quantity module. The distributed IO device plays a bridge role in uploading information and forwarding control commands.

[0006] By adopting the solution of the utility model, the gas turbine control system Mark Vie can remotely monitor the operating status and accident alarm information of the medium-voltage motor, interlock and remotely start and stop the medium-voltage motor, and through the collected power information, such as voltage, current, active power, reactive power, etc., the gas turbine control system can analyze the energy consumption data of the motor, remind of approaching maintenance and sort out maintenance items, and count the number of starts and stops, operating time, etc.

[0007] Furthermore, the controller is a PFC200 controller, which supports access to digital modules, analog modules and special function modules, and has network and field bus interfaces, including PROFIBUS: 1 x D-sub 9 socket; CANopen: 1 x D-sub 9 plug; Modbus (TCP, UDP): 2 x RJ-45; Modbus® RTU: 1 x D-sub9 socket; RS-232 serial interface: 1 x D-sub 9 socket; RS-485 serial interface: 1 x D-sub 9 socket; supports communication protocols IEC 60870-5-101 / 103 / 104, IEC 61850.

[0008] Furthermore, the switch quantity input module is two 8-channel switch quantity input modules, the power supply voltage is DC24V, each input channel is equipped with an anti-interference filter and an optocoupler isolation input.

[0009] Furthermore, the switch output module is two 2-channel switch output modules, with passive dry contact output and two pairs of conversion contacts.

[0010] Furthermore, the analog input module is a three-phase power measurement module, which is used to measure electrical quantities in a three-phase power grid, including three-phase voltage and three-phase current signals, and calculate active power, reactive power, apparent power, power factor, phase angle, and frequency based on the input voltage and current signals.

[0011] Furthermore, the terminal module is used to form a complete internal data loop and ensure the accuracy of the data flow.

[0012] Furthermore, the power module is a switching regulated power supply with an input voltage range of AC85V~264V or DC120V~300V, a rated output voltage of DC24V, and a rated output current of 5A, providing power for distributed IO devices.

[0013] The utility model has the following beneficial effects:

[0014] 1. One water injection pump and one fuel pump share one set of distributed IO devices, which saves the number of distributed IO devices and reduces the initial investment of equipment;

[0015] 2. The distributed IO device is connected to the gas turbine control system using optical cables, which reduces the number of control cables and increases the number of signals collected by the gas turbine control system, thereby achieving more comprehensive monitoring and control functions for the motor;

[0016] 3. The wiring between the distributed IO device and the two 10kV switch cabinets and the gas turbine control system is simple and has a clear structure, which is convenient for on-site commissioning and maintenance;

[0017] 4. The distributed IO device adopts a modular design for easy expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 : System block diagram of the utility model;

[0019] Attached Figure 2 : System principle diagram of the utility model;

[0020] Attached Figure 3 : Distributed IO device configuration diagram;

[0021] Attached Figure 4: Distributed IO device wiring diagram. DETAILED DESCRIPTION

[0022] Combined with the drawings of the utility model, the technical scheme of the implementation of the example new model is clearly and completely described. Obviously, the described implementation examples are only partial examples of the utility model, not all. Based on the specific implementation scheme of the utility model, other implementation examples obtained by ordinary technicians in this field without making creative improvements are all within the scope of protection of the utility model.

[0023] See attached Figure 1 and attached Figure 2 , the distributed IO device is the core of the utility model, and the device is installed in the 10kV switch cabinet I. On the one hand, the device is connected to the 10kV switch cabinet I comprehensive protection device and the 10kV switch cabinet II comprehensive protection device through hard wiring + communication line. At the same time, the device is connected to the current and voltage information of the 10kV switch cabinet I current transformer, the 10kV switch cabinet II current transformer, and the 10kV bus voltage transformer through hard wiring; on the other hand, the device establishes a communication connection with the gas turbine control system Mark Vie through communication. In order to realize the above-mentioned hard wiring and communication connection scheme, it is necessary to pay attention to the following when selecting the equipment: ① The comprehensive protection device installed in the two 10kV switch cabinets, in addition to the conventional motor protection function, must also support the RS485 communication interface and ModBus RTU communication protocol, and have at least 8 programmable input channels and 2 remote control output channels; ② The communication connection with the gas turbine control system uses the Profibus DP dedicated cable and matching plug.

[0024] See attached Figure 3 The distributed IO device consists of a controller 1, a switch input module 2, a switch output module 3, an analog input module 4, a terminal module 5 and a power module 6. The controller and modules used in this example are all mature products of WANGO Electronics (Tianjin) Co., Ltd. Figure 3The whole device is installed on the rail in the 10kV switch cabinet I. The data between modules are transmitted through the built-in bus. The switch input module consists of two 8-channel digital input modules (model 750-431), and the switch output module consists of two 2-channel output modules (model 750-517). The power supply module 6 (model 787-1622) provides power for the entire distributed IO device; the terminal module 5 (model 750-600) is a necessary component for forming a communication network and ensuring smooth communication; the switch input module 2 is hard-wired to access the external input switch signal; the switch output module 3 is hard-wired to output the control command signal; the analog input module 4 (model 750-494) is hard-wired to access the external voltage and current signal; the controller 1 (model 750-8216) has RS485 and Profibus field bus interfaces, supports IEC61850 communication protocol, and completes the management of input signals and communication protocol conversion functions.

[0025] See attached Figure 4 , the wiring of each module is described as follows:

[0026] The switch quantity input module 2 has a total of 16 switch quantity input channels, and the connected switch quantity signals include: the water injection pump motor is running, the water injection pump motor power supply circuit breaker is in the working position, the water injection pump motor power supply circuit breaker is in the test position, the water injection pump motor power supply circuit breaker fault alarm, the water injection pump motor power supply circuit breaker fault trip, the water injection pump motor power supply bus voltage is normal, the fuel pump motor is running, the fuel pump motor power supply circuit breaker is in the working position, the fuel pump motor power supply circuit breaker is in the test position, the fuel pump motor power supply circuit breaker fault alarm, the fuel pump motor power supply circuit breaker fault trip, the fuel pump motor power supply bus voltage is normal, and 4 spare input channels are reserved.

[0027] The control commands output by the switch output module 3 include: starting the water injection pump motor, stopping the water injection pump motor, starting the fuel pump motor, and stopping the fuel pump motor.

[0028] The analog signals connected to the analog input module 4 include: three-phase current of the water injection pump motor, three-phase voltage of the water injection pump motor, three-phase current of the fuel pump motor, and three-phase voltage of the fuel pump motor. Based on the collected voltage and current signals, the module can calculate electrical parameters such as active power, reactive power, apparent power, power factor, phase angle, and frequency.

[0029] Controller 1 is a programmable controller that communicates with each module through a built-in bus, processes input and output data, and controls the communication port with the gas turbine control system and the 10kV comprehensive protection device.

Claims

1. A distributed IO device for remote monitoring of medium-voltage motors of gas turbines, characterized in that include: A controller (1), a switch input module (2), a switch output module (3), an analog input module (4), a terminal module (5) and a power supply module (6), wherein the switch input module (2) is connected to two 10 kV switch cabinets by hard wiring to collect operation signals and abnormal alarm signals of the 10 kV switch cabinets and the comprehensive protection device; the switch output module (3) outputs control command signals and is connected to the comprehensive protection device in the two 10 kV switch cabinets by hard wiring, and these signals are used to start and stop the water injection pump motor and the fuel pump motor; the analog input module (4) is used to measure The electrical quantities in the three-phase power grid calculate active power, reactive power, apparent power, power factor, phase angle and frequency according to the input voltage and current signals; the terminal module (5) is used to form a complete internal data loop and ensure the accuracy of the data flow; the power module (6) provides power for the distributed IO device; the data transmission between the controller (1) and each module is completed through the built-in bus; the controller (1) is connected to the comprehensive protection device in the 10kV switch cabinet through a communication method to collect other signals except the signals transmitted by the hard wiring; the controller (1) also establishes a communication connection with the gas turbine control system Mark Vie, adopts Profibus DP and IEC61850 communication protocols, uploads the information received by the distributed IO device from the 10kV switch cabinet, and at the same time, receives the control command from the gas turbine control system and sends it to the comprehensive protection device in the 10kV switch cabinet through the switch output module (3); the distributed IO device plays a bridge role in uploading information and forwarding control commands.

2. A distributed IO device for remote monitoring of medium-voltage motors of gas turbines according to claim 1, characterized in that: The controller (1) is a PFC200 controller, which supports the access functions of digital modules, analog modules and functional modules, and has network and field bus interfaces, including PROFIBUS: 1 x D-sub 9 socket; CANopen: 1 x D-sub9 plug; Modbus TCP / UDP: 2 x RJ-45; Modbus RTU: 1 x D-sub 9 socket; RS-232 serial interface: 1x D-sub 9 socket; RS-485 serial interface: 1 x D-sub 9 socket; supports communication protocols IEC 60870-5-101 / 103 / 104, IEC 61850.

3. A distributed IO device for remote monitoring of medium-voltage motors of gas turbines according to claim 1, characterized in that: The switch quantity input module (2) comprises two 8-channel switch quantity input modules, the power supply voltage is DC24V, and each input channel is provided with an anti-interference filter and an optical coupler isolation input.

4. A distributed IO device for remote monitoring of medium-voltage motors of gas turbines according to claim 1, characterized in that: The switch quantity output module (3) comprises two 2-way switch quantity output modules with passive dry contact output, and each module has two pairs of conversion output contacts.

5. A distributed IO device for remote monitoring of medium-voltage motors of gas turbines according to claim 1, characterized in that: The terminal module (5) is used to form a complete internal data loop and ensure the accuracy of the data flow.

6. A distributed IO device for remote monitoring of medium-voltage motors of gas turbines according to claim 1, characterized in that: The power supply module (6) is a switching voltage-stabilized power supply with an input voltage range of AC85V~264V or DC120V~300V, a rated output voltage of DC24V, and a rated output current of 5A, and provides power for distributed IO devices.

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