CN100491749C - Power generating equipment regulating valve oil motor servo control system - Google Patents
Power generating equipment regulating valve oil motor servo control system Download PDFInfo
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- CN100491749C CN100491749C CNB2006100213978A CN200610021397A CN100491749C CN 100491749 C CN100491749 C CN 100491749C CN B2006100213978 A CNB2006100213978 A CN B2006100213978A CN 200610021397 A CN200610021397 A CN 200610021397A CN 100491749 C CN100491749 C CN 100491749C
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Abstract
The present invention relates to a power generation equipment regulation valve oil-motor servo control system of steam turbine, gas turbine and hydroturbine, etc. It has a closed-cycle control loop formed from successively connected servo control card, servo valve, oil-motor and stroke converter LVDT. It is characterized by that it has two servo control cards and two LVDT stroke converters, the described servo valve adopts double-coil electromagnetic valve, every coil is combined with one servo control card and one LVDT stroke converter, so that two control loops with identical structure can be formed, said two control loops are parallel connected.
Description
Technical field
The present invention relates to be used for the regulating valve oil motor servo control system of power generating equipments such as steam turbine, gas turbine, water turbine.
Background technique
The reliability requirement of power generating equipments such as steam turbine, gas turbine, water turbine is very high, the control loop of most of controll plant all adopts the redundant configuration mode in the system, to improve reliability, for example master controller, power supply, DC electrical source, important I/O signal etc., but, the Stroke Control of the modulating valve oil engine of steam, combustion gas, fuel oil, the water yield but remains single loop control, becomes the weak link in the above-mentioned control system, and very big potential safety hazard lies dormant.In China, control system shown in Figure 1 is arranged at present, adopt two LVDT feedbacks, single servo controlling card, unicoil solenoid valve, though the LVDT of this system feedback is a redundant configuration, but two feedback signals are only got one, select circuit (HS) to choose high-value signal by height and participate in control, when servo controlling card, height selected circuit, the arbitrary element fault of servovalve coil, control loop was with malfunctioning.Abroad, companies such as Hitachi adopt control system shown in Figure 2, constitute two control loops with two servo controlling cards, article two, the working state of control loop be " or " logical relation, have only one to put into operation, when the servocontrol card failure of operating loop, detect and switch to another loop by automatic switch-over circuit.Its shortcoming is: LVDT is single feedback, and when the LVDT fault, control loop is with malfunctioning.And, this double loop control is essential to be considered self diagnosis and follows the tracks of the problem of switching, automatic switch-over circuit is set makes the system architecture complexity, probability of failure increases, and the rate of fault of diverter circuit itself will further reduce the reliability of system, and servo controlling card switches the possibility that there is fault in moment, as it is big to switch disturbance, can't switch, control loop is also with malfunctioning, and reliability can not guarantee.
In sum, existing power generating equipment regulating valve oil motor servo control system, having only subelement is redundant configuration, having an element at least is that two control loops are shared, thereby do not have really to realize the redundant configuration of control loop, can not obtain very high reliability.
Summary of the invention
Purpose of the present invention provides the higher power generating equipment regulating valve oil motor servo control system of a kind of reliability, and its technological scheme is:
A kind of power generating equipment regulating valve oil motor servo control system connects to form close loop control circuit in regular turn by servo controlling card, servovalve, oil engine, stroke transducer LVDT, and described servo controlling card has regulator; It is characterized in that: described servo controlling card, LVDT stroke transducer are two, described servovalve adopts the dual coil electromagnetic valve, each coil and a servo controlling card and a LVDT stroke transducer combination constitute the identical control loop of two-strip structure, and two control loops are connected in parallel.
Described regulator adopts proportioner.
Also be provided with fault loop self diagnosis and servo card electric current output shut-off means, this device be located in the servo card or the power generating equipment control system in.
The oil motor servo control system of said structure, have two control loops complete, that be connected in parallel, there is not shared element in two loops, that is to say that control loop is a redundant configuration, two control loops move simultaneously, wherein arbitrary loop fault, another loop is still in running order, and therefore, system has high reliability.Compare with external system, do not have automatic switch-over circuit, structure is simpler, has not only reduced probability of failure, has also reduced system cost.
Description of drawings
Fig. 1 is a kind of structured flowchart of existing regulating valve oil motor servo control system
Fig. 2 is the structured flowchart of another kind of existing regulating valve oil motor servo control system
Fig. 3 is the structured flowchart of this regulating valve oil motor servo control system
Embodiment
This power generating equipment regulating valve oil motor servo control system, have two control loops that configuration is identical, each control loop has a servo controlling card and a stroke transducer LVDT, servovalve adopts the dual coil electromagnetic valve, servovalve coil of each control loop control, as shown in Figure 3, wherein servo controlling card 1, stroke transducer LVDT1, servovalve coil 1 constitutes a control loop, servo controlling card 2, stroke transducer LVDT2, servovalve coil 2 constitutes another control loop, article two, control loop redundant configuration, the continuous operation separately of each control loop.
The working principle of this control system is: stroke transducer LVDT converts oil engine piston stroke displacement amount to electrical signal, feed back to servo controlling card, compare with default valve specified rate, calculate through servo controlling card, the output control signal corresponding is given the servovalve coil, thereby change the open degree of servovalve, realize control the oil engine piston stroke.Under normal state, two control loop parallel runnings are worked simultaneously, the current energy stack of two coils, and acting in conjunction is controlled the oil engine piston stroke in servovalve; When control loop fault wherein, another road is still moved, and works independently, and can guarantee the stable control to the oil engine piston stroke.
In this control system, regulator in the servo controlling card adopts proportioner (P), and is stable to guarantee control system, this be because:
If two stroke transducer LVDT feedback characteristicss are just the same, theoretically, adopt proportional and integral controller (PI), control loop can be stable, but in fact, owing to making reason, the feedback characteristics of two stroke transducer LVDT can not be just the same, the difference at zero point of two LVDT, with this understanding, the output signal of two proportional and integral controllers changes round about, is divergent trend, so this system is unsettled.
The present invention adopts proportioner (P), and the output signal of two regulators is convergent tendency, the trend certain value, and system is stable.
More than be the stability analysis of system when normally moving, when control loop fault, a system in the control system are adjusted into when being controlled separately by another control loop automatically, there are two kinds of possibilities in the stability of system:
-fault loop regulator is output as zero, and signal code disappears, and it is stable that system remains.
The output signal electric current of-fault loop regulator is very big, surpasses the upper limit of signal code value, system's instability.
As seen, when control loop fault in the control system, when system is controlled separately by another control loop, the stability of system is uncertain, therefore, system must have the function of the servo card signal electric current output of self diagnosis and automatic disengagement failure loop, just can guarantee system stability.Self diagnosis, cut-out function can take following technological means to realize:
-in servo card, set up self diagnosis, shut-off means; Or
-in the power generating equipment control system, set up self diagnosis, shut-off means.
This self diagnosis, shut-off means can be hardware circuits, also software program, or the device of software and hardware combining, and these concrete technological means are known general knowledge for a person skilled in the art, so do not describe in detail.
Because it is poor that the feedback signal value of ratio regulating system and the given signal value of valve have, therefore, in actual engineering, article two, the proportioner of control loop (P) must be through site test, make the parameter matching of two regulators suitable, the steady-state error of valve specified rate and feedback quantity is as far as possible little, could guarantee that the control system response is quick, reliable, stable.
Claims (3)
1. a power generating equipment regulating valve oil motor servo control system connects to form close loop control circuit in regular turn by servo controlling card, servovalve, oil engine and stroke transducer LVDT, and described servo controlling card has regulator; It is characterized in that: described servo controlling card, LVDT stroke transducer are two, described servovalve adopts the dual coil electromagnetic valve, each coil and a servo controlling card and a LVDT stroke transducer combination constitute the identical control loop of two-strip structure, and two control loops are connected in parallel.
2. power generating equipment regulating valve oil motor servo control system according to claim 1 is characterized in that: described regulator adopts proportioner.
3. power generating equipment regulating valve oil motor servo control system according to claim 1 is characterized in that: also be provided with fault loop self diagnosis and servo card electric current output shut-off means, this device be located in the servo controlling card or the control system of power generating equipment in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100213978A CN100491749C (en) | 2006-07-14 | 2006-07-14 | Power generating equipment regulating valve oil motor servo control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100213978A CN100491749C (en) | 2006-07-14 | 2006-07-14 | Power generating equipment regulating valve oil motor servo control system |
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| Publication Number | Publication Date |
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| CN1888455A CN1888455A (en) | 2007-01-03 |
| CN100491749C true CN100491749C (en) | 2009-05-27 |
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| CNB2006100213978A Active CN100491749C (en) | 2006-07-14 | 2006-07-14 | Power generating equipment regulating valve oil motor servo control system |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103838138A (en) * | 2014-03-21 | 2014-06-04 | 哈尔滨电气股份有限公司 | Triple-redundancy servo control card |
| CN106705822A (en) * | 2016-11-29 | 2017-05-24 | 中国神华能源股份有限公司 | Turbine valve stroke measuring device, turbine valve stroke monitoring system and turbine valve stroke monitoring method |
| CN112696525B (en) * | 2020-12-25 | 2023-04-28 | 国能神福(石狮)发电有限公司 | Valve control system and control method |
| CN112727819B (en) * | 2020-12-28 | 2023-02-03 | 浙江汽轮成套技术开发有限公司 | Servo redundant control system of steam turbine |
| CN113431820B (en) * | 2021-06-17 | 2024-01-30 | 浙江中控技术股份有限公司 | Redundant servo control system and method supporting online replacement |
| CN113719357B (en) * | 2021-07-30 | 2022-12-09 | 南京国电南自维美德自动化有限公司 | Control system of heavy gas turbine regulating valve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4737655A (en) * | 1986-06-26 | 1988-04-12 | General Electric Company | Prime mover control |
| US4814680A (en) * | 1987-08-21 | 1989-03-21 | Sundstrand Corporation | Servo loop control for a coriolis rate sensor dither drive |
| CN2500809Y (en) * | 2001-11-12 | 2002-07-17 | 北京和利时系统工程股份有限公司 | High-pressure fire resistant oil type direct feedback electric hydraulic oil moving equipment |
| US6810906B2 (en) * | 2002-07-30 | 2004-11-02 | Mitsubishi Heavy Industries, Ltd. | Flow control device |
-
2006
- 2006-07-14 CN CNB2006100213978A patent/CN100491749C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4737655A (en) * | 1986-06-26 | 1988-04-12 | General Electric Company | Prime mover control |
| US4814680A (en) * | 1987-08-21 | 1989-03-21 | Sundstrand Corporation | Servo loop control for a coriolis rate sensor dither drive |
| CN2500809Y (en) * | 2001-11-12 | 2002-07-17 | 北京和利时系统工程股份有限公司 | High-pressure fire resistant oil type direct feedback electric hydraulic oil moving equipment |
| US6810906B2 (en) * | 2002-07-30 | 2004-11-02 | Mitsubishi Heavy Industries, Ltd. | Flow control device |
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| CN1888455A (en) | 2007-01-03 |
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Owner name: SICHUAN ORIENT ELECTRIC AUTOMATIC CONTROL ENGINEER Effective date: 20121112 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121112 Address after: 618201 Deyang City, Sichuan Province town of Hanwang Patentee after: Dongfang Turbine Co., Ltd., Dongfang Electric Group Patentee after: Sichuan Orient Electric Automatic Control Engineering Co., Ltd. Address before: 618201 Deyang City, Sichuan Province town of Hanwang Patentee before: Dongfang Turbine Co., Ltd., Dongfang Electric Group |
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| CP03 | Change of name, title or address |
Address after: 618000 Jinsha Jiangxi Road, high tech Industrial Park, Deyang, Sichuan, 666 Co-patentee after: Dongfang Electric Automatic Control Engineering Co., Ltd. Patentee after: Dongfang Turbine Co., Ltd., Dongfang Electric Group Address before: 618201 Deyang City, Sichuan Province town of Hanwang Co-patentee before: Sichuan Orient Electric Automatic Control Engineering Co., Ltd. Patentee before: Dongfang Turbine Co., Ltd., Dongfang Electric Group |
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