Speed regulator electrical control system based on redundant hot standby

Abstract

The utility model discloses a speed regulator electrical control system based on redundant hot standby, comprising a PLC module, a communication module, a power supply module, a PID control module and a frequency measurement module, the communication module is used for data transmission among the PID control module, the communication module and the PLC module, the PID control module generates a PID control signal according to a current operation state and external sensor parameters, and the frequency measurement module is used for measuring the frequency of the PLC module. The frequency measurement module is used for detecting the unit frequency and the power grid frequency of the first PLC unit and the second PLC unit, when at least one of the unit frequency and the power grid frequency breaks down, a fault signal is generated, the PLC module adopts a redundant hot standby mode of double PLC units, the first PLC unit or the second PLC unit is preset to serve as a main PLC unit, and during operation, the main PLC unit is connected with the frequency measurement module. And the main PLC unit switches the PLC unit in a normal state as the main PLC unit according to the fault signal, so that a channel of the quitted fault PLC unit can be subjected to power-off maintenance, a dual-machine cross redundancy fault-tolerant full-digital electro-hydraulic speed regulator is formed, and the controllability and reliability of the system are effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of governor control systems, and particularly relates to a governor electrical control system based on redundant hot standby. Background Art

[0002] The water turbine governing system consists of a water turbine control system and a controlled system. Sensors such as water level, frequency, active power, and guide vane opening outside the governor transmit the information of the unit to the Programmable Logic Controller (PLC) module. The PLC module synthesizes this information with the control instructions on the monitoring system or the governor panel, generates a control signal according to the current working state and control target of the unit, transmits the control signal to the actuator, and after electro-hydraulic conversion, the control instruction finally acts on the guide vane (blade) servomotor, thereby changing the operating state of the unit and achieving the expected control target. However, all current water turbine governing systems use a single governor to control the generator set through a mechanical hydraulic structure. However, when the governor equipment needs to be overhauled, it will cause great inconvenience to the operation of the unit. Content of the Utility Model

[0003] In order to solve the above problems existing in the prior art, the utility model is realized through the following technical solutions:

[0004] The utility model provides a governor electrical control system based on redundant hot standby, which includes a PLC module, a communication module, a power supply module, a PID control module and a frequency measurement module. Among them, the PLC module includes a first PLC unit and a second PLC unit connected to each other. The first PLC unit and the second PLC unit are respectively connected to the communication module. The first PLC unit and the second PLC unit are also respectively connected to the blade servomotor. Both the first PLC unit and the second PLC unit can receive external sensor parameters and perform data transmission. One of the first PLC unit and the second PLC unit is preset as the main PLC unit. The main PLC unit selects and switches the PLC unit in the normal state in the first PLC unit and the second PLC unit as the main PLC unit according to the received fault signal. The main PLC unit controls the operation state of the blade servomotor according to the received PID control signal. The communication module is also respectively connected to the PID control module and the frequency measurement module. The communication module is used for data transmission. The PID control module generates the PID control signal according to the current operation state and the external sensor parameters. The frequency measurement module can detect whether the first PLC unit and the second PLC unit fail. When the first PLC unit and / or the second PLC unit fails, the fault signal is generated. The fault signal is used to indicate that the first PLC unit and / or the second PLC unit fails. The power supply module is respectively connected to the communication module, the PID control module and the frequency measurement module.

[0005] In an embodiment of the utility model, the first PLC unit includes a first control unit, a first communication unit and a first power supply unit. The second PLC unit includes a second control unit, a second communication unit and a second power supply unit. The first power supply unit is respectively connected to the first control unit and the first communication unit. The second power supply unit is respectively connected to the second control unit and the second communication unit. The first communication unit is respectively connected to the first control unit, the second control unit, the communication module and the blade servomotor. The second communication unit is respectively connected to the first control unit, the second control unit, the communication module and the blade servomotor.

[0006] In an embodiment of the utility model, the main PLC unit selects and switches the PLC unit in the normal state in the first PLC unit and the second PLC unit as the main PLC unit according to the received fault signal, including that when the fault signal indicates that the main PLC unit fails, the main PLC unit switches the PLC unit in the normal state in the first PLC unit and the second PLC unit as the main PLC unit.

[0007] In an embodiment of the present utility model, the frequency measurement module can detect whether the first PLC unit and the second PLC unit fail, including that the frequency measurement module detects the unit frequency and grid frequency of the first PLC unit and the second PLC unit, and generates the failure signal when at least one of the unit frequency and grid frequency in the first PLC unit and the second PLC unit fails.

[0008] In an embodiment of the present utility model, the frequency measurement module adopts a dual-channel redundant hot standby method of PT residual voltage frequency measurement and gear disk frequency measurement.

[0009] In an embodiment of the present utility model, the PID control module generates the PID control signal according to the current operating state and the external sensor parameters by using the PID control algorithm.

[0010] In an embodiment of the present utility model, the PID control signal includes a PID control mode, an optimal value of PID parameters, and a gain of the optimal value of the PID parameters.

[0011] In an embodiment of the present utility model, the PID control module generates a PI control signal according to the current operating state and the external sensor parameters, and the main PLC unit controls the operating state of the blade servomotor according to the received PI control signal.

[0012] In an embodiment of the present utility model, the PI control signal includes a PI control mode, an optimal value of PI parameters, and a gain of the optimal value of the PI parameters.

[0013] In an embodiment of the present utility model, the external sensor parameters include guide vane opening, water head, load, frequency, and active power.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The speed governor electrical control system based on redundant hot standby provided by the present utility model adopts a redundant hot standby method with dual PLC units for the PLC module. During the operation of the speed regulation system, the standby PLC unit that is not participating in the control only shields its output channels and exits, while the CPU, digital input / output module, and analog input module are still operating normally. Once the standby PLC unit obtains the primary right and becomes the primary PLC unit, the output channels of the previous standby PLC unit are released from restrictions and operate normally, thus achieving the effective control of the speed governor actuator unit immediately without affecting the normal operation of the speed regulation system. The PLC unit that obtains the primary right has a control output restoration to zero during the stable operation of the speed regulation system without regulation. Once the primary PLC unit determines that it has a serious fault or cannot control normally based on the fault signal transmitted by the frequency measurement module, the primary PLC unit alarms and relinquishes the primary right, and at the same time exits all output channels, realizing that when one PLC unit fails, another PLC unit can automatically obtain the speed regulation control right, thereby ensuring the stable operation of the hydropower station. By adopting industrial Ethernet or wireless network technology, real-time data exchange between various modules of the system is achieved, solving the unit operation problems caused when the speed governor control equipment needs to be overhauled, improving the reliability and stability of the hydropower station, and reducing the operation and maintenance costs.

[0016] The following will further elaborate on the present utility model in detail with reference to the accompanying drawings and embodiments. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of a speed governor electrical control system based on redundant hot standby provided by an embodiment of the present utility model;

[0018] Figure 2 is Figure 1 the internal structure connection schematic diagram of the PLC module in

[0019] Description of the Reference Numerals:

[0020] 1 - PLC module; 2 - communication module; 3 - power supply module; 4 - PID control module; 5 - frequency measurement module. Detailed Embodiment

[0021] In order to further elaborate on the technical means and effects adopted by the present utility model to achieve the predetermined utility model purpose, the following will detail the solution according to the present utility model with reference to the accompanying drawings and specific embodiments.

[0022] The foregoing and other technical contents, features and effects of the present utility model will be clearly presented in the following detailed description in conjunction with the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding of the technical means and effects adopted by the present utility model to achieve the predetermined purpose can be obtained. However, the attached drawings are only for reference and illustration, and are not used to limit the technical solution of the present utility model.

[0023] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant are intended to cover non-exclusive inclusion, so that an article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the article or device including the said element.

[0024] Please refer to Figure 1 , Figure 1 FIG. is a schematic structural diagram of a speed governor electrical control system based on redundant hot standby provided by an embodiment of the present utility model. The speed governor electrical control system based on redundant hot standby includes a PLC module 1, a communication module 2, a power supply module 3, a Proportion Integration Differentiation (PID) control module 4, and a frequency measurement module 5.

[0025] Further, the PLC module 1 is connected to the communication module 2, and the PLC module 1 performs data transmission through the communication module 2. Specifically, the PLC module 1 includes a first PLC unit and a second PLC unit connected to each other. The first PLC unit and the second PLC unit are respectively connected to the communication module 2, and the first PLC unit and the second PLC unit are also respectively connected to the blade servomotor. Both the first PLC unit and the second PLC unit can receive external sensor parameters and perform data transmission. One of the first PLC unit and the second PLC unit is preset as the main PLC unit. The main PLC unit selects and switches the PLC unit in the normal state between the first PLC unit and the second PLC unit as the main PLC unit according to the received fault signal. The main PLC unit controls the operating state of the blade servomotor according to the received PID control signal. The communication module 2 is also respectively connected to the PID control module 4 and the frequency measurement module 5. The communication module 2 is used for data transmission. Specifically, the communication module 2 is used for data transmission between the PID control module 4 and the frequency measurement module 5 and the PLC module 1 respectively. The PID control module 4 generates the above-mentioned PID control signal according to the current operating state and the external sensor parameters. The frequency measurement module 5 can detect whether the first PLC unit and the second PLC unit fail, and generates a fault signal when the first PLC unit and / or the second PLC unit fails. The fault signal is used to indicate that the first PLC unit and / or the second PLC unit fails. In other words, when the first PLC unit fails, or the second PLC unit fails, or both the first PLC unit and the second PLC unit fail, a fault signal is generated. The power supply module 3 is respectively connected to the PLC module 1, the communication module 2, the PID control module 4 and the frequency measurement module 5. The power supply module 3 provides voltage for the PLC module 1, the communication module 2, the frequency measurement module 5 and the PID control module 4.

[0026] Please refer to Figure 2 , Figure 2 is Figure 1Schematic diagram of the internal structure connection of the PLC module in it. The first PLC unit and the second PLC unit both include independent control units, communication units and power supply units. Specifically, the first PLC unit includes a first control unit, a first communication unit and a first power supply unit, and the second PLC unit includes a second control unit, a second communication unit and a second power supply unit. The first power supply unit is respectively connected to the first control unit and the first communication unit, and the second power supply unit is respectively connected to the second control unit and the second communication unit. The first communication unit is respectively connected to the first control unit, the second control unit, communication module 2 and the blade servomotor, and the second communication unit is respectively connected to the first control unit, the second control unit, communication module 2 and the blade servomotor. The governor electrical control system based on redundant hot standby provided in this embodiment, by setting the first PLC unit and the second PLC unit for the PLC module 1, and setting independent power supply units for each PLC unit to supply power to the control unit and the communication unit within their respective units, thus avoiding the influence of the power supply failure of the power supply module 3 on the PLC unit, reducing the coupling of the governor electrical control system. Each communication unit can realize signal transmission with all control units, communication module 2 and the blade servomotor, thus realizing the function of redundant fault tolerance.

[0027] Further, the main PLC unit selects and switches the PLC unit in the normal state in the first PLC unit and the second PLC unit as the main PLC unit according to the received fault signal. Specifically, when the fault signal indicates that the main PLC unit has a fault, the main PLC unit switches the PLC unit in the normal state in the first PLC unit and the second PLC unit as the main PLC unit. When the fault signal indicates that another PLC unit other than the main PLC unit has a fault, the main PLC unit does not perform a switching operation, and the staff repairs the faulty PLC unit according to this fault information.

[0028] Further, the frequency measurement module 5 can detect whether the first PLC unit and the second PLC unit have faults. Specifically, the frequency measurement module 5 detects the unit frequency and the grid frequency of the first PLC unit and the second PLC unit. When at least one of the unit frequency and the grid frequency in the first PLC unit and the second PLC unit has a fault, the fault signal is generated.

[0029] Preferably, the frequency measurement module 5 adopts a dual-channel redundant hot standby method of PT residual voltage frequency measurement and tooth disc frequency measurement. The governor electrical control system based on redundant hot standby provided in this embodiment sets the frequency measurement module 5 to adopt a dual-channel redundant hot standby method of PT residual voltage frequency measurement and tooth disc frequency measurement. The two-channel frequency measurements are hot standby for each other. Once a certain channel fails, it immediately switches to the other channel without disturbance, improving the reliability of the frequency measurement scheme. The frequency measurement module 5 can detect faults of the first PLC unit and the second PLC unit, and is a very critical component for determining the safe and stable operation of the hydro-generating unit and the governor.

[0030] In this embodiment, the PID control module 4 uses a PID control algorithm to generate a PID control signal or a PI control signal according to the current operating state and the external sensor parameters. The main PLC unit controls the blade servomotor to operate at the optimal PID parameter value based on the PID control mode with the gain of the optimal PID parameter value, or the main PLC unit controls the blade servomotor to operate at the optimal PI parameter value based on the PI control mode with the gain of the optimal PI parameter value, so as to realize the signal control for the precise speed regulation of the prime mover.

[0031] Preferably, the PID control signal includes a PID control mode, an optimal PID parameter value, and the gain of the optimal PID parameter value.

[0032] Further, in addition to controlling the operating state of the blade servomotor by means of the PID control signal, the PID control module 4 can also generate a proportional-integral (PI) control signal according to the current operating state and the external sensor parameters, and the main PLC unit controls the operating state of the blade servomotor according to the received PI control signal.

[0033] Preferably, the PI control signal includes a PI control mode, an optimal PI parameter value, and the gain of the optimal PI parameter value.

[0034] Further, the external sensor parameters include guide vane opening, water head, load, frequency, and active power.

[0035] In this embodiment, the communication module 2 realizes the connection between the PLC module 1 in the governor electrical control system and the power station computer monitoring system through hard wiring and Ethernet data communication. All signals and data can be communicated in real time through the MODBUS / TCP protocol. For important signals, such as power and guide vane opening, secondary confirmation is carried out through hard wiring. The power supply module 3 is connected in parallel to two power supplies, namely, an AC voltage of 220V and a DC voltage of 220V. The specific power supply method is that the AC voltage of 220V power supply is directly connected to an AC high-frequency switching power supply with an input voltage level of 220V ± 20% AC voltage, and the DC power supply is connected to a DC switching power supply with an input voltage level of 220V ± 20% DC voltage. Then, the DC 24V outputs of the two switching power supplies are respectively sent to a dual-power redundant integrated module with a filter and an anti-interference device, and the dual-power redundant integrated module delivers the synthesized 24V DC voltage to provide independent power supply circuits for the PLC microcomputer governor system, the speed detection and speed monitoring system, and the emergency shutdown operating system in the external circuit.

[0036] In the governor electrical control system based on redundant hot standby provided in this embodiment, the PLC module adopts the redundant hot standby method of dual PLC units. During the operation of the speed regulation system, the standby PLC unit that does not participate in the control only shields its output channels and exits, while the CPU, digital input module, and analog input module are still operating normally. Once the standby PLC unit obtains the primary right and becomes the primary PLC unit, the output channels of the previous standby PLC unit are released from restrictions and operate normally, so as to achieve taking over the effective control of the governor actuator unit immediately without affecting the normal operation of the speed regulation system. The PLC unit that obtains the primary right has a control output restoration of zero when the speed regulation system operates stably without regulation. Once the primary PLC unit determines that it has a serious fault or cannot control normally based on the fault signal transmitted by the frequency measurement module, the primary PLC unit alarms and relinquishes the primary right, and at the same time exits all output channels, realizing that when one PLC unit fails, another PLC unit can automatically obtain the speed regulation control right, thus ensuring the stable operation of the hydropower station. By adopting industrial Ethernet or wireless network technology, real-time data exchange between two generator sets and the control system is realized, solving the problem of unit operation caused by the need for maintenance of the governor control equipment, improving the reliability and stability of the hydropower station, and reducing the operation and maintenance costs.

[0037] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A speed regulator electrical control system based on redundant hot standby, characterized in that: It comprises a PLC module (1), a communication module (2), a power module (3), a PID control module (4) and a frequency measurement module (5), wherein: The PLC module (1) comprises a first PLC unit and a second PLC unit connected to each other, the first PLC unit and the second PLC unit are respectively connected to the communication module (2), the first PLC unit and the second PLC unit are also respectively connected to a blade relay, the first PLC unit and the second PLC unit are both capable of receiving external sensor parameters and performing data transmission, one of the first PLC unit and the second PLC unit is pre-set as a main PLC unit, the main PLC unit selects and switches a normal PLC unit of the first PLC unit and the second PLC unit as the main PLC unit according to a received fault signal, and the main PLC unit controls the blade relay according to the received PID control signal. The communication module (2) is also connected to the PID control module (4) and the frequency measurement module (5) respectively. The communication module (2) is used for data transmission. The PID control module (4) generates the PID control signal according to the current operating state and the external sensor parameter. The frequency measurement module (5) can detect whether the first PLC unit and the second PLC unit have a fault. When the first PLC unit and / or the second PLC unit has a fault, the fault signal is generated. The fault signal is used to indicate that the first PLC unit and / or the second PLC unit has a fault. The power supply module (3) is connected to the communication module (2), the PID control module (4) and the frequency measurement module (5) respectively.

2. The speed regulator electrical control system based on redundant hot standby according to claim 1 is characterized in that: The first PLC unit comprises a first control unit, a first communication unit and a first power supply unit, and the second PLC unit comprises a second control unit, a second communication unit and a second power supply unit, the first power supply unit is respectively connected to the first control unit and the first communication unit, the second power supply unit is respectively connected to the second control unit and the second communication unit, the first communication unit is respectively connected to the first control unit, the second control unit, the communication module (2) and the blade relay, and the second communication unit is respectively connected to the first control unit, the second control unit, the communication module (2) and the blade relay.

3. The speed regulator electrical control system based on redundant hot standby according to claim 1, characterized in that: The main PLC unit selects and switches the PLC unit in a normal state between the first PLC unit and the second PLC unit as the main PLC unit according to the received fault signal, including, when the fault signal indicates that a fault has occurred in the main PLC unit, the main PLC unit switches the PLC unit in a normal state between the first PLC unit and the second PLC unit as the main PLC unit.

4. The speed regulator electrical control system based on redundant hot standby according to claim 1, characterized in that: The frequency measurement module (5) is capable of detecting whether a fault occurs in the first PLC unit and the second PLC unit, comprising: the frequency measurement module (5) detects the unit frequency and the grid frequency of the first PLC unit and the second PLC unit, and generates the fault signal when at least one of the unit frequency and the grid frequency in the first PLC unit and the second PLC unit fails.

5. The speed regulator electrical control system based on redundant hot standby according to claim 1, characterized in that: The frequency measurement module (5) adopts a dual-path redundant hot standby mode of PT residual pressure frequency measurement and gear disc frequency measurement.

6. The speed regulator electrical control system based on redundant hot standby according to claim 1, characterized in that: The PID control module (4) generates the PID control signal according to the current operating state and the external sensor parameters using a PID control algorithm.

7. The speed regulator electrical control system based on redundant hot standby according to claim 1, characterized in that: The PID control signal includes a PID control mode, an optimal value of a PID parameter, and a gain of the optimal value of the PID parameter.

8. The speed regulator electrical control system based on redundant hot standby according to claim 1, characterized in that: The PID control module (4) generates a PI control signal according to the current operating state and the external sensor parameters, and the main PLC unit controls the operating state of the blade servomotor according to the received PI control signal.

9. The speed regulator electrical control system based on redundant hot standby according to claim 8, characterized in that: The PI control signal includes a PI control mode, an optimal value of a PI parameter, and a gain of the optimal value of the PI parameter.

10. The speed regulator electrical control system based on redundant hot standby according to claim 1, characterized in that: The external sensor parameters include guide vane opening, water head, load, frequency, and active power.

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