CN110571798B - Dynamic measurement method for power feedback first-order inertia time constant of steam turbine generator unit - Google Patents
Dynamic measurement method for power feedback first-order inertia time constant of steam turbine generator unit Download PDFInfo
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- CN110571798B CN110571798B CN201910843220.3A CN201910843220A CN110571798B CN 110571798 B CN110571798 B CN 110571798B CN 201910843220 A CN201910843220 A CN 201910843220A CN 110571798 B CN110571798 B CN 110571798B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
Abstract
The invention discloses a dynamic measurement method for a first-order inertia time constant of power feedback of a steam turbine generator unit, which comprises the following steps: firstly, switching the service power of an operating unit from a high-level power station to a standby power station; step two, gradually reducing the load of the unit to a set value; thirdly, opening a grid-connected switch, acquiring a grid-connected signal and a power feedback signal, and calculating power feedback to measure pure delay time; and fourthly, constructing a transfer function model according to the power feedback signal of the actual measurement unit, and performing simulation calculation by using a least square method to obtain a power feedback first-order inertia time constant. The invention can measure the power feedback first-order inertia time constant before the machine set finishes the machine set with load warming and the mechanical overspeed test, does not additionally increase the workload of the test and the machine set working condition adjustment, can quickly stabilize the machine set to 3000r/min, is beneficial to the machine set to be quickly connected to the grid or to carry out the next test, and is beneficial to the safety and the economy of the machine set.
Description
Technical Field
The invention relates to a dynamic measurement method for a power feedback first-order inertia time constant of a steam turbine generator unit, and belongs to the technical field of measurement of the power time constant of the steam turbine generator unit.
Background
One of the characteristics of modern power systems is the introduction of modern control theory and computing technology into the system, which creates conditions for off-line computational analysis and on-line real-time control of the system. However, the calculation or control must be established on the basis of accurate and credible mathematical models, and the mathematical models comprise a generator, an excitation system, a prime motor and a speed regulation system, a comprehensive load model and the like. One of the keys of the safety and stability calculation of the power system is to acquire the dynamic parameters of the system which conform to the reality and establish an accurate mathematical model of the system.
Because most of the existing units cannot carry out static test on the power transmitter during the period of load, in the analysis and calculation of the power system, the steam turbine and the speed regulating system thereof mostly adopt the classical model and parameters, and the pure time delay and the first-order inertia link of the power feedback link are ignored, so that the deviation is brought to the calculation result, and further, various power system stability control strategies and the like based on the classical model and the parameters are also influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the dynamic measurement method for the power feedback first-order inertia time constant of the steam turbine generator unit is provided, and the problem that the static test cannot be carried out on the time constant of the power transmitter during the period of load of the steam turbine generator unit is solved.
The technical scheme of the invention is as follows: a dynamic measurement method for a first-order inertia time constant of power feedback of a steam turbine generator unit comprises the following steps:
firstly, switching the service power of an operating unit from a high-level power station to a standby power station;
step two, gradually reducing the load of the unit to a set value;
thirdly, a grid-connected switch is pulled open, a grid-connected signal and a power feedback signal are obtained, power feedback measurement pure delay time is calculated, the grid-connected signal is a unit grid-connected signal, the power feedback signal is a power signal which is sent to a DCS card by a power transmitter at an electric side and enters a power PID after being processed by a speed limiting and filtering module, and the power feedback measurement pure delay time is a time difference between the grid-connected signal and the power feedback signal;
fourthly, constructing a transfer function model according to the power feedback signal of the actual measurement unit,
in the formula: pEFor feedback of power, TPdelayMeasuring the pure delay time, T, for power feedbackRFeeding back a corresponding first-order inertia element time constant for power;
and carrying out simulation calculation by using a least square method to obtain a power feedback first-order inertia time constant.
Preferably, a unit grid-connected signal and an actual transmitting power signal are accessed to a data acquisition system, the data acquisition system is used for acquiring the grid-connected signal and a power feedback signal, the actual transmitting power signal is transmitted to a DCS card by an electric side power transmitter, and the power signal before entering a power PID is processed by a speed limiting and filtering module.
Preferably, the transfer function model is built by utilizing a Matlab software Simulink platform.
Preferably, the set value is 5% of the rated load of the unit.
The logic action principle of the invention is as follows: the DEH power control receives actual power feedback from the electrical power transmitter. It can be simplified into a pure delay element and a first-order inertia element. And after the unit parallel net belt load warming is finished, manually separating to perform a turbine mechanical overspeed test. And obtaining the delay time of a power measurement link and a power feedback inertia time constant by recording the closing signal of the generator outlet circuit breaker and the power of the generator received by the DEH side.
The invention has the beneficial effects that: the invention can measure the power feedback first-order inertia time constant before the machine set finishes the machine set with load warming and the mechanical overspeed test, does not additionally increase the workload of the test and the machine set working condition adjustment, can quickly stabilize the machine set to 3000r/min, is beneficial to the machine set to be quickly connected to the grid or to carry out the next test, and is beneficial to the safety and the economy of the machine set.
Drawings
FIG. 1 is a control logic power measurement point;
FIG. 2 is a BPA model power feedback module;
FIG. 3 is a measured grid-connected signal and a power feedback signal;
FIG. 4 shows the time constant identification of the first-order inertia element of the power feedback.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments:
in order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 4, a method for dynamically measuring a first-order inertia time constant of a turbo generator set by power feedback according to an embodiment of the present invention includes the following steps:
firstly, a unit grid-connected signal and an actual transmission power signal are accessed into a data acquisition system, the actual transmission power signal is transmitted to a DCS card by an electric side power transmitter, and the power signal before entering a power PID is processed by a speed limiting and filtering module, which is specifically shown in figure 1.
And secondly, switching the service power of the running unit from a high-power station to a standby station.
And step three, gradually reducing the load of the unit to about 5% of rated load.
And fourthly, pulling the grid-connected switch open, acquiring a grid-connected signal and a power feedback signal from the data acquisition system, and calculating power feedback measurement pure delay time, wherein the power feedback measurement pure delay time is the time difference acquired between the grid-connected signal and the power feedback signal.
Fifthly, building a transfer function model by utilizing a Matlab software Simulink platform according to the power feedback signal of the actual measurement unit,
in the formula: pEFor feedback of power, TPdelayMeasuring the pure delay time, T, for power feedbackRAnd feeding back a corresponding first-order inertia element time constant for power.
And carrying out simulation calculation by using a least square method to obtain a power feedback first-order inertia time constant.
As shown in Table 1, in one example, the PE and TP _ Delay are input, resulting in a TR of 0.043 s.
TABLE 1 Power measurement Link actual measurement model parameters
Referring to fig. 3 again, the actually measured grid-connected signal and the power feedback signal, and the time constant identification result of the power feedback first-order inertia link in fig. 4, it can be seen that the difference between the power feedback first-order inertia time constant obtained by simulation by the measurement method and the actually measured power feedback first-order inertia time constant is not large, and the accuracy is high.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (3)
1. A dynamic measurement method for a first-order inertia time constant of power feedback of a steam turbine generator unit is characterized by comprising the following steps:
firstly, a unit grid-connected signal and an actual power signal are accessed into a data acquisition system, the data acquisition system is used for acquiring the grid-connected signal and a power feedback signal, the actual power signal is sent to a DCS (distributed control system) card by an electric side power transmitter, and is processed by a speed limiting and filtering module to enter a power signal before entering a power PID (proportion integration differentiation), the DCS is a distributed control system, the DCS card is a distributed control system analog quantity input card, and the service power of a running unit is switched from a high-level power transformer to a standby power transformer;
step two, gradually reducing the load of the unit to a set value;
thirdly, a grid-connected switch is pulled open, a grid-connected signal and a power feedback signal are obtained, power feedback measurement pure delay time is calculated, the grid-connected signal is a unit grid-connected signal, the power feedback signal is a power signal which is sent to a DCS card by a power transmitter at an electric side and enters a power PID after being processed by a speed limiting and filtering module, and the power feedback measurement pure delay time is a time difference between the grid-connected signal and the power feedback signal;
fourthly, constructing a transfer function model according to the power feedback signal of the actual measurement unit,
in the formula: pEFor feedback of power, TPdelayMeasuring the pure delay time, T, for power feedbackRFeeding back a corresponding first-order inertia element time constant for power;
and carrying out simulation calculation by using a least square method to obtain a power feedback first-order inertia time constant.
2. The method for dynamically measuring the first-order inertia time constant of the power feedback of the steam turbine generator unit as claimed in claim 1, wherein the transfer function model is built by using a Matlab software Simulink platform.
3. The method of claim 1, wherein the set value is 5% of the rated load of the steam turbine generator unit.
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| SU569733A1 (en) * | 1975-05-19 | 1977-08-25 | Всесоюзный Дважды Ордена Трудового Красного Знамени Теплотехнический Научноисследовательский Институт Им. Ф.Э. Дзержинского | Device for heat control of turbine rotor |
| CN103590859A (en) * | 2013-11-19 | 2014-02-19 | 中国神华能源股份有限公司 | Steam turbine power regulation method and equipment without PID |
| CN104089270A (en) * | 2014-07-11 | 2014-10-08 | 国家电网公司 | Optimization and adjustment testing method for load control of generator set boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU569733A1 (en) * | 1975-05-19 | 1977-08-25 | Всесоюзный Дважды Ордена Трудового Красного Знамени Теплотехнический Научноисследовательский Институт Им. Ф.Э. Дзержинского | Device for heat control of turbine rotor |
| CN103590859A (en) * | 2013-11-19 | 2014-02-19 | 中国神华能源股份有限公司 | Steam turbine power regulation method and equipment without PID |
| CN104089270A (en) * | 2014-07-11 | 2014-10-08 | 国家电网公司 | Optimization and adjustment testing method for load control of generator set boiler |
| CN107317344A (en) * | 2017-07-26 | 2017-11-03 | 国网福建省电力有限公司 | A kind of generating set forced power oscillation investigates Optimum Experiment method |
| CN110021942A (en) * | 2019-04-17 | 2019-07-16 | 华能国际电力股份有限公司德州电厂 | A kind of frequency modulation control method based on DCS |
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