Distributed control system for combined cooling heating and power

Abstract

The utility model relates to a distributed control system for combined cooling heating and power, which comprises a master control system and a sub-control system, and data between the sub-control system and the master control system are interacted through a bus. The sub-control systems are used for executing instructions sent by the master control system and respectively acquiring power supply system operation data, gas turbine operation data, generator operation data, environment parameters, fire extinguishing system operation parameters and waste heat utilization device operation parameters; the master control system issues an instruction to the sub-control system according to the received data sent by the sub-control system; according to the utility model, a distributed architecture is adopted, a control function is distributed to each sub-control system, the coupling of the system is reduced, automatic redundancy switching and system reconstruction functions can be realized among the sub-control systems, the continuous operation of the whole system is ensured, meanwhile, the main control system can be set remotely, and the system is convenient to use. And remote monitoring and control of the combined cooling heating and power system are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a distributed control system for combined cooling, heating and power generation and a control method thereof. Background Art

[0002] With the increasing demand for energy, efficient and environmentally friendly energy supply systems have become the focus of research. As an efficient and clean energy conversion device, ground-mounted gas turbines have significant advantages in the trigeneration system of cooling, heating and power. However, the control system of the existing trigeneration system usually adopts a centralized architecture, the main control computer is busy, and the coupling degree between sub-nodes is high, resulting in low control efficiency, electromagnetic compatibility problems and insufficient reliability. Utility Model Content

[0003] In view of the problems existing in the prior art, the utility model proposes a distributed control system for trigeneration of cooling, heating and power, which adopts a distributed architecture and connects each sub-node with the main node through a high-speed bus data network, thereby realizing distributed allocation of control functions and improving control efficiency and reliability.

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

[0005] The utility model proposes a distributed control system for trigeneration of cooling, heating and power, comprising a main control system and a sub-control system. Data between the sub-control system and the main control system are exchanged through a bus. The sub-control system is used to execute instructions sent by the main control system and respectively obtain power system operating data, gas turbine operating data, generator operating data, environmental parameters, fire protection system operating parameters and waste heat utilization device operating parameters. The main control system sends instructions to the sub-control system based on the data sent by the sub-control system.

[0006] Furthermore, the sub-control system includes a power supply measurement and control system, a gas turbine measurement and control system, a generator measurement and control system, an environmental parameter measurement and control system, a fire protection measurement and control system, and a waste heat utilization device measurement and control system;

[0007] The power supply measurement and control system is used to obtain the power supply system operation data and control the power supply system to power on the other sub-control systems;

[0008] The gas engine measurement and control system is used to obtain gas engine operation data and control the start and stop of the gas engine;

[0009] The generator measurement and control system is used to obtain generator operation data and control the start and stop of the generator;

[0010] The environmental parameter measurement and control system is used to obtain environmental parameters;

[0011] The fire control system is used to obtain the operating parameters of the fire protection system and control the fire sprinklers to spray water or stop spraying water;

[0012] The waste heat utilization device measurement and control system is used to obtain the operating parameters of the waste heat utilization device and control the start and stop and working mode of the waste heat utilization device.

[0013] Furthermore, the power system operation data includes power supply voltage, operating current, remaining power, charging time, and charging current;

[0014] The engine operation data includes gas generator operation data, intake valve operation data, exhaust valve operation data, power turbine gearbox lubricating oil supply pressure, lubricating oil temperature, lubricating oil tank level, and starter operation data;

[0015] The environmental parameters include ambient temperature, ambient pressure, and ambient humidity;

[0016] The fire protection system operating parameters include smoke concentration, water spray pressure of fire sprinklers, and alarm device operating current;

[0017] The operating parameters of the waste heat utilization device include cold water inlet / inlet temperature, cooling water inlet / inlet temperature, high temperature, exhaust temperature, and pump frequency.

[0018] Furthermore, the gas turbine measurement and control system includes a gas turbine full authority digital control system, an intake and exhaust measurement and control system, a power turbine measurement and control system, a generator measurement and control system, and a starting control system;

[0019] The gas engine authority digital control system is used to obtain the gas generator operation data and control the start and stop of the gas generator;

[0020] The intake and exhaust measurement and control system obtains the operation data of the intake valve and the exhaust valve of the combustion engine and controls the opening and closing degree of the intake valve and the exhaust valve;

[0021] The power turbine measurement and control system is used to obtain the lubricating oil supply pressure, lubricating oil temperature and lubricating oil tank liquid level of the power turbine gearbox and control the opening and closing of the oil supply pump and the oil return pump;

[0022] The start control system is used to obtain starter operation data and control the start and stop of the starter.

[0023] Further, the gas generator operation data includes the gas generator speed, the power turbine speed, the theoretical fuel supply, the gas generator exhaust temperature, the lubricating oil temperature, the lubricating oil pressure, and the intake pressure difference;

[0024] The intake valve operation data include intake temperature and intake pressure, and the exhaust valve operation data include exhaust temperature and exhaust pressure;

[0025] The generator operation data includes the generated voltage, generated current and power factor;

[0026] The starter operation data includes starting voltage, starting current, and motor speed;

[0027] The operating data of the waste heat utilization device includes cold water inlet / inlet temperature, cooling water inlet / inlet temperature, high temperature, exhaust temperature, pump frequency, refrigerant temperature, and set temperature.

[0028] Furthermore, the starting control system includes a speed monitoring module and a power adjustment module, wherein the speed monitoring module is used to monitor the speed of the starter motor, and the power adjustment module is used to monitor and adjust the starting voltage and starting current of the starter.

[0029] Furthermore, the self-control system sends data to the bus via RS485 communication protocol.

[0030] The control method of the distributed control system for the above-mentioned combined cooling, heating and power generation comprises the following steps:

[0031] (1) CCHP system standby: The sub-control system performs self-inspection and transmits the self-inspection results to the main control system, and the gas generator is in a static state;

[0032] (2) Startup of the CCHP system: The master control system sends a command to the start control system, which controls the starter motor to start, driving the gas generator to start rotating. The gas turbine authority digital control system monitors that the gas generator speed reaches the ignition speed, and the gas turbine full authority digital control system controls the gas generator ignition system to ignite, and the oil supply system to supply oil. After 40 seconds or when the gas generator speed reaches 9000r / min, the master control system sends a command to the start control system to disconnect the starter motor and sends a command to the gas turbine authority digital control system to disconnect the power supply of the ignition system, and the gas generator stops working. The gas generator starts successfully.

[0033] (3) Power generation of the combined cooling, heating and power system: The master control system sends a power generation command to the full-authority digital control system of the gas turbine. The full-authority digital control system of the gas turbine adjusts the speed of the power turbine by controlling the oil supply, and the generator enters the power generation state;

[0034] (4) Cooling or heating of the CCHP system: The master control system sends a cooling command to the waste heat utilization device measurement and control system through the bus. The waste heat utilization device measurement and control system controls the waste heat utilization device to start and enter the cooling mode. After the waste heat utilization device is successfully started, the master control system sends a command to the waste heat utilization device measurement and control system to control the waste heat utilization device to start and open the heat source valve. The main control system sends a command to the intake and exhaust measurement and control system to control the opening and closing degree of the drain valve according to the difference between the refrigerant temperature sent back by the waste heat utilization measurement and control system and the set temperature;

[0035] (5) Shutdown of the combined heat, cooling and power system: After the refrigeration task is completed, the main control system sends a command to the waste heat utilization device control system to control the waste heat utilization device to shut down the refrigeration function. The main control system then sends a command to the waste heat utilization measurement and control system to control the waste heat utilization device to shut down. At the same time, the main control system sends a command to the intake and exhaust measurement and control system to control the exhaust valve to gradually open to the maximum. Finally, the main control system sends commands to the gas turbine full authority digital control system and the generator measurement and control system to control the generator to stop generating electricity, the gas generator to stop rotating, and the system to shut down.

[0036] Furthermore, the ignition speed is 900r / min.

[0037] Furthermore, after the gas generator is successfully started, the rotation speed is 10500±300r / min.

[0038] Compared with the prior art, the beneficial effects of the utility model are:

[0039] (1) The control system of the utility model adopts a distributed architecture, including a sub-control system and a master control system. Each sub-control system monitors a module of the CCHP system, realizing the distributed allocation of control functions, so that the control efficiency and electromagnetic compatibility of the whole system are significantly improved;

[0040] (2) The distributed allocation of control functions in the control system of the utility model reduces the coupling of the system and improves the reliability of the system;

[0041] (3) The control system of the utility model can remotely access and monitor the CCHP system through the main control system, making the maintenance of the equipment more convenient;

[0042] (4) The sub-control systems and the overall control system of the utility model exchange data via a bus, and redundancy management and system reconstruction can be achieved between the sub-control systems, thereby ensuring the continuous operation and stability of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings herein are incorporated into and constitute a part of this specification, and together with the description, are used to explain the principles of the present utility model.

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0045] Figure 1 This is a schematic diagram of the structure of the distributed control system of the utility model;

[0046] Figure 2 This is a control flow chart of the distributed control system of the utility model. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] refer to Figure 1 This embodiment proposes a distributed control system for trigeneration of cooling, heating and power, including a main control system and a sub-control system. The data between the sub-control system and the main control system are exchanged through a bus. The sub-control system is used to execute instructions sent by the main control system and respectively obtain power system operating data, gas turbine operating data, generator operating data, environmental parameters, fire protection system operating parameters and waste heat utilization device operating parameters. The main control system sends instructions to the sub-control system based on the data sent by the sub-control system.

[0049] This embodiment adopts a distributed architecture, and the control functions are distributed to each sub-control system. Automatic redundancy switching and system reconstruction functions can be realized between each sub-control system. When a sub-control system fails, other sub-control systems can automatically take over its tasks to ensure the continuous operation of the entire system. At the same time, the main control system of this embodiment can be remotely set to realize remote monitoring and control of the trigeneration system.

[0050] Furthermore, the sub-control system includes a power supply measurement and control system, a gas turbine measurement and control system, a generator measurement and control system, an environmental parameter measurement and control system, a fire protection measurement and control system and a waste heat utilization device measurement and control system; the gas turbine measurement and control system includes a gas turbine full authority digital control system, an intake and exhaust measurement and control system, a power turbine measurement and control system, a generator measurement and control system and a starting control system.

[0051] The power supply measurement and control system is used to obtain the power supply system operation data and control the power supply system to power on the other sub-control systems; the power supply measurement and control system transmits the power supply voltage, working current, remaining power, charging time, and charging current to the bus according to the RS485 communication protocol, and can also transmit information such as the internal temperature of the chassis to the bus. The overall control system judges the information sent by the power supply measurement and control system and sends instructions to the power supply measurement and control system, including whether to power each sub-control system, and the power supply measurement and control system receives and executes the instructions.

[0052] The gas engine authority digital control system is used to obtain the gas generator operation data and control the start and stop of the gas generator; the gas engine authority digital control system transmits the gas engine working status, gas generator speed, power turbine speed, theoretical fuel supply, gas generator exhaust temperature, lubricating oil temperature, lubricating oil pressure, intake pressure difference to the bus according to the RS422 communication protocol, and can also transmit gas status information to the bus. The information transmitted by the gas engine authority digital control system is judged by the main control system of the combined heat and power system and then issued to the gas engine full authority digital control system. The instructions include starting, ignition, mode conversion, parking, etc. The gas engine full authority digital control system receives and executes the instructions.

[0053] The intake and exhaust measurement and control system obtains the operating data of the intake valve and the exhaust valve of the combustion engine and controls the opening and closing degree of the intake valve and the exhaust valve; the intake and exhaust measurement and control system transmits the intake temperature, intake pressure, exhaust temperature, exhaust pressure, and exhaust valve opening to the bus according to the RS485 communication protocol. The information transmitted by the intake and exhaust measurement and control system is judged by the main control system of the trigeneration system, and an instruction is issued to the intake and exhaust measurement and control system, the instruction including the exhaust valve opening, and the intake and exhaust measurement and control system receives and executes the instruction.

[0054] The power turbine measurement and control system is used to obtain the lubricating oil supply pressure, lubricating oil temperature and lubricating oil tank level of the power turbine gearbox and control the opening and closing of the oil supply pump and the return oil pump; the power turbine measurement and control system transmits the lubricating oil supply pressure, lubricating oil temperature and lubricating oil tank level of the power turbine gearbox to the bus according to the RS485 communication protocol. The information transmitted by the power turbine measurement and control system is judged by the main control system of the combined heating, cooling and power supply system, and then instructions are issued to the power turbine measurement and control system. The instructions include opening / closing the oil supply pump, opening / closing the return oil pump, etc. The power turbine measurement and control system receives and executes the instructions.

[0055] The starting control system is used to obtain the starter operation data and control the start and stop of the starter; the starting control system transmits the starting voltage and starting current to the bus according to the RS485 communication protocol, and can also transmit the starter fault status to the bus. The information transmitted by the starting control system is judged by the main control system of the trigeneration system, and then an instruction is issued to the starting control system, including the starting voltage output, etc. The starting control system receives and executes the instruction.

[0056] The generator measurement and control system is used to obtain the generator operation data and control the start and stop of the generator; the generator measurement and control system transmits the power generation voltage, power generation current, and power factor to the bus system according to the RS485 communication protocol, and can also transmit the generator fault status to the bus. The information transmitted by the generator measurement and control system is judged by the main control system of the trigeneration system, and instructions are issued to the generator measurement and control system. The instructions include closing / opening the switch, etc. The generator measurement and control system receives and executes the instructions.

[0057] The environmental parameter measurement and control system is used to obtain environmental parameters; the environmental parameter measurement and control system transmits the ambient temperature, ambient pressure, and ambient humidity to the bus system according to the RS485 communication protocol. The main control system determines whether to send instructions to other automatic control systems based on the information transmitted by the environmental parameter measurement and control system. For example, the ambient temperature affects the ignition speed of the gas generator. When the speed of the gas generator reaches the speed corresponding to the current ambient temperature, the main control system will send an ignition instruction to the gas turbine authority digital control system.

[0058] The fire measurement and control system is used to obtain the operating parameters of the fire protection system and control the fire sprinklers to spray water or stop spraying water; the fire measurement and control system transmits the smoke concentration, the water spraying pressure of the fire sprinklers, and the working current of the alarm device to the bus according to the RS485 communication protocol. The fire measurement and control system is judged by the main control system of the trigeneration system and then sends instructions to the fire measurement and control system. The instructions include whether the fire sprinklers spray water or stop spraying water. The fire measurement and control system receives the instructions and executes them. For example, when the smoke concentration is greater than the set value, the main control system sends the fire measurement and control system an instruction to spray water from the fire sprinklers. The fire measurement and control system receives the instruction and controls the fire sprinklers of the fire protection system to spray water.

[0059] The waste heat utilization device measurement and control system is used to obtain the operating parameters of the waste heat utilization device and control the start and stop and working mode of the waste heat utilization device; the waste heat utilization device measurement and control system transmits the cold water inlet and inlet temperature, cooling water inlet and inlet temperature, high temperature, exhaust temperature, pump frequency, refrigerant temperature, set temperature to the bus according to the RS485 communication protocol, and can also send the fault status of the waste heat utilization device to the bus. The information transmitted by the waste heat utilization device measurement and control system is judged by the main control system of the combined heat, cooling and power supply system, and instructions are issued to the waste heat utilization device measurement and control system. The instructions include given temperature, shutdown / startup, working mode, etc. The waste heat utilization device measurement and control system receives and executes the instructions.

[0060] Furthermore, the starting control system includes a speed monitoring module and a power adjustment module, wherein the speed monitoring module is used to monitor the speed of the starter motor, and the power adjustment module is used to monitor and adjust the starting voltage and starting current of the starter.

[0061] refer to Figure 2 The control method of the distributed control system for the above-mentioned trigeneration of cooling, heating and power specifically includes the following steps:

[0062] (1) CCHP system standby: The power system powers on each sub-control system, each sub-control system performs self-test and transmits the self-test results to the main control system, and the gas generator is in a static state;

[0063] (2) Starting the CCHP system: the master control system sends a command to the starting control system, and the starting control system controls the starter to enter the starting state. The starter drives the gas generator to start rotating. The master control system monitors that the gas generator speed reaches the ignition speed. In this embodiment, the ignition speed is set to 900 r / min. The master control system instructs the full authority digital control system of the gas generator to control the ignition system of the gas generator to ignite, and the oil supply system to supply oil. After 40 seconds or when the gas generator speed reaches 9000 r / min, the master control system sends a command to disconnect the starter motor to the starting control system and sends a command to disconnect the power supply of the ignition system to the gas generator authority digital control system, and the gas generator stops working. When the gas generator speed reaches the ground slow steady-state limit (10500±300) r / min, the gas generator starts successfully, and the CCHP system enters the gas generator slow steady-state control state.

[0064] (3) Power generation of the combined cooling, heating and power system: The overall control system sends a power generation command to the full-authority digital control system of the gas turbine. The full-authority digital control system of the gas turbine adjusts the speed of the power turbine by controlling the oil supply, and the generator enters the power generation state; when the user's power consumption changes, the full-authority digital control system of the gas turbine performs feedforward control according to the power transmitted by the generator measurement and control system, and the throttle quickly responds to the value calculated by the mathematical model of the gas turbine to avoid the power turbine speed from exceeding the limit; at the same time, the full-authority digital control system of the gas turbine steadily controls the throttle according to the deviation between the actual speed of the power turbine and the expected speed, so that the power turbine speed is adjusted to the qualified range of 12900±65r / min, and the stabilization time is no more than 7s, to ensure the steady-state and transient characteristics of the power turbine speed (generation frequency);

[0065] (4) Cooling or heating of the combined heat and power system: The waste heat utilization device measurement and control system performs self-test. If the self-test result is normal, the main control system sends a cooling command to the waste heat utilization device measurement and control system through the bus. The waste heat utilization device measurement and control system controls the waste heat utilization device to start and enter the cooling mode. After the waste heat utilization device starts successfully, the main control system sends a command to the waste heat utilization device measurement and control system to control the waste heat utilization device to start and open the heat source valve. The main control system sends a command to the intake and exhaust measurement and control system to control the opening and closing degree of the drain valve according to the difference between the refrigerant temperature sent back by the waste heat utilization measurement and control system and the set temperature;

[0066] (5) Shutdown of the combined heat, cooling and power system: After the refrigeration task is completed, the main control system sends a command to the waste heat utilization device control system to control the waste heat utilization device to shut down the refrigeration function. The main control system then sends a command to the waste heat utilization measurement and control system to control the waste heat utilization device to shut down. At the same time, the main control system sends a command to the intake and exhaust measurement and control system to control the exhaust valve to gradually open to the maximum. Finally, the main control system sends commands to the gas turbine full authority digital control system and the generator measurement and control system to control the generator to stop generating electricity, the gas generator to stop rotating, and the system to shut down.

[0067] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A distributed control system for combined cooling, heating and power generation, characterized in that: It includes a general control system and a sub-control system. The data between the sub-control system and the general control system are exchanged through a bus. The sub-control system is used to execute the instructions sent by the general control system and respectively obtain the power system operation data, gas turbine operation data, generator operation data, environmental parameters, fire protection system operation parameters and waste heat utilization device operation parameters. The general control system sends instructions to the sub-control system according to the data sent by the sub-control system.

2. The distributed control system for combined cooling, heating and power generation according to claim 1, characterized in that: The sub-control system includes a power supply measurement and control system, a gas turbine measurement and control system, a generator measurement and control system, an environmental parameter measurement and control system, a fire protection measurement and control system, and a waste heat utilization device measurement and control system; The power supply measurement and control system is used to obtain the power supply system operation data and control the power supply system to power on the other sub-control systems; The gas engine measurement and control system is used to obtain gas engine operation data and control the start and stop of the gas engine; The generator measurement and control system is used to obtain generator operation data and control the start and stop of the generator; The environmental parameter measurement and control system is used to obtain environmental parameters; The fire control system is used to obtain the operating parameters of the fire protection system and control the fire sprinklers to spray water or stop spraying water; The waste heat utilization device measurement and control system is used to obtain the operating parameters of the waste heat utilization device and control the start and stop and working mode of the waste heat utilization device.

3. The distributed control system for combined cooling, heating and power generation according to claim 1, characterized in that: The power system operation data includes power supply voltage, operating current, remaining power, charging time, and charging current; The engine operation data includes gas generator operation data, intake valve operation data, exhaust valve operation data, power turbine gearbox lubricating oil supply pressure, lubricating oil temperature, lubricating oil tank level, and starter operation data; The environmental parameters include ambient temperature, ambient pressure, and ambient humidity; The fire protection system operating parameters include smoke concentration, water spray pressure of fire sprinklers, and alarm device operating current; The operating parameters of the waste heat utilization device include cold water inlet / inlet temperature, cooling water inlet / inlet temperature, high temperature, exhaust temperature, and pump frequency.

4. The distributed control system for combined cooling, heating and power generation according to claim 2, characterized in that: The gas turbine measurement and control system includes a gas turbine authority digital control system, an intake and exhaust measurement and control system, a power turbine measurement and control system, a generator measurement and control system, and a starting control system; The gas engine authority digital control system is used to obtain the gas generator operation data and control the start and stop of the gas generator; The intake and exhaust measurement and control system obtains the operation data of the intake valve and the exhaust valve of the combustion engine and controls the opening and closing degree of the intake valve and the exhaust valve; The power turbine measurement and control system is used to obtain the lubricating oil supply pressure, lubricating oil temperature and lubricating oil tank liquid level of the power turbine gearbox and control the opening and closing of the oil supply pump and the oil return pump; The start control system is used to obtain starter operation data and control the start and stop of the starter.

5. The distributed control system for combined cooling, heating and power generation according to claim 4, characterized in that: The gas generator operation data includes the gas generator speed, the power turbine speed, the theoretical fuel supply, the gas generator exhaust temperature, the lubricating oil temperature, the lubricating oil pressure, and the intake pressure difference; The intake valve operation data include intake temperature and intake pressure, and the exhaust valve operation data include exhaust temperature and exhaust pressure; The generator operation data includes the generated voltage, generated current and power factor; The starter operation data includes starting voltage, starting current, and motor speed; The operating data of the waste heat utilization device includes cold water inlet / inlet temperature, cooling water inlet / inlet temperature, high temperature, exhaust temperature, pump frequency, refrigerant temperature, and set temperature.

6. The distributed control system for combined cooling, heating and power generation according to claim 4, characterized in that: The starting control system includes a speed monitoring module and a power adjustment module. The speed monitoring module is used to monitor the speed of the starter motor, and the power adjustment module is used to monitor and adjust the starting voltage and starting current of the starter.

7. The distributed control system for combined cooling, heating and power generation according to claim 1, characterized in that: The sub-control system sends data to the bus via the RS485 communication protocol.

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