CN105226710A - Based on the generating set under-excitation ability dynamical min method of measured data - Google Patents
Based on the generating set under-excitation ability dynamical min method of measured data Download PDFInfo
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Abstract
The invention discloses a kind of generating set under-excitation ability dynamical min method based on measured data, by carrying out leading phase test having switched on standby change, get rid of the limiting factor with system voltage strong correlation, obtain the under-excitation ability of generating set itself, as automatic voltage adjusting device and the low boundary condition of encouraging restriction and adjusting of field regulator, guarantee generating set safe operation under this condition, then the limiting factor with system voltage strong correlation is accessed automatic voltage adjusting device, make generating set under-excitation ability according to the limiting factor data acquisition of actual measurement, thus reach the object of dynamic conditioning unit under-excitation ability.
Description
Technical field
The present invention relates to a kind of generating set under-excitation ability dynamical min method based on measured data, belong to net coordination technique field, source.
Background technology
Along with a large amount of inputs of extra-high voltage alternating current-direct current long distance transmission line, the capacitive reactive power of electrical network constantly increases, and especially between low-load period, high voltage problem becomes increasingly conspicuous, it is idle that Generation in Leading Phase Operation then can absorb grid excess in a large number, greatly alleviates system high voltage problem.But enter phase situation analysis from Spring Festival unit in recent years, nearest three annuals of generating set are entered the phase degree of depth and are constantly deepened, but line voltage is increasing higher than the situation of limit value, the idle situation of current electric grid is more and more severeer as can be seen here, and current electrical network proposes higher requirement to unit under-excitation ability.
At present, the under-excitation ability of generating set is obtained by leading phase test, although be pass through set end voltage in leading phase test, machine end electric current, merit angle, station-service voltage, the limiting factors such as temperature determine the under-excitation ability of unit, but shown by many experimental results, in leading phase test process, final nearly all test is all limited to station-service voltage, station-service voltage is then by the low change of factory, factory's height becomes and main transformer is connected with system, station-service voltage fluctuates along with the fluctuation of system voltage, therefore, the unit under-excitation ability obtained by leading phase test is the under-excitation ability of unit actual motion under reflection current system voltage, along with the reduction of system voltage, unit under-excitation ability weakens, system voltage raises, and unit under-excitation ability then strengthens.So when between electrical network low-load period, system voltage is in a high position, now the under-excitation ability of generating set is far longer than the under-excitation ability that leading phase test obtains.
In sum, on the one hand, electric network reactive-load situation is more and more severeer, while continuing to increase the input of reactor, increasing to the demand of unit under-excitation ability between low-load period; Electric network state restriction when the under-excitation ability of generating set is put to the test on the one hand, the under-excitation ability that test obtains, relative to under-excitation ability between electrical network low-load period, is in relatively more conservative state.It may be necessary technological means, excavate unit under-excitation ability, between electrical network low-load period, give full play to unit under-excitation ability, solve the problem that line voltage is higher, improve safe operation of electric network.
In addition, during owing to previously carrying out leading phase test, the low definite value of encouraging restriction and automatism voltage control device (AVC) of part of generating units is according to the under-excitation ability setting of the unit switched after station service own, between low-load period in the Spring Festival, AVC device is generally out of service, the exterior domain of the under-excitation ability avoiding the automatic regulation voltage of AVC device to run at that time to unit thus cause unit chaser accident.AVC device is out of service, power plant is idle according to the voltage limits adjustment unit that scheduling is given, this operation is unfavorable for the development of grid automation, and for various reasons, a lot of unit is reluctant participate in leading phase operation or participate in unit leading phase operation less, exacerbate the situation of electric network reactive-load surplus, what increase scheduling enters phase management difficulty simultaneously.。
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of generating set under-excitation ability dynamical min method based on measured data.
In order to achieve the above object, the technical solution adopted in the present invention is:
Based on the generating set under-excitation ability dynamical min method of measured data, comprise the following steps,
Step one, carries out generating set leading phase test, generating set under-excitation ability and limiting factor under acquisition accidental conditions;
Step 2, if limiting factor and system voltage strong correlation, then the generating set under-excitation ability that current test obtains fluctuates with electric network state, goes to step three; Set end voltage, station-service voltage and system voltage is comprised with the limiting factor of system voltage strong correlation;
If limiting factor is weak relevant to system voltage, then the generating set under-excitation ability that current test obtains is the under-excitation ability of generating set itself, does not possess dynamical min space, then terminate to excavate; Merit angle, temperature and stator current is comprised to the weak relevant limiting factor of system voltage;
Step 3, switching station service to playing standby change, getting rid of the limiting factor with system voltage strong correlation, carrying out leading phase test, according to relevant limiting factor weak to system voltage, obtaining the under-excitation ability of generating set itself;
Step 4, encourages limiting parameter according to the relevant parameter of the under-excitation ability of generating set setting automatism voltage control device itself and the low of field regulator;
Step 5, accesses automatism voltage control device by the limiting factor with system voltage strong correlation, design logic in automatism voltage control device, to determine increasing magnetic and the demagnetize operation of generating set.
The logic of design is that, when limiting factor is higher than permissible value, the order of generating set demagnetize is effective; When limiting factor encounters permissible value, generating set demagnetize command expiration; When limiting factor is lower than permissible value, generating set automatically increases magnetic until limiting factor is higher than permissible value.
The beneficial effect that the present invention reaches: the present invention is by carrying out leading phase test having switched in standby change, get rid of the limiting factor with system voltage strong correlation, obtain the under-excitation ability of generating set itself, as automatic voltage adjusting device and the low boundary condition of encouraging restriction and adjusting of field regulator, guarantee generating set safe operation under this condition, then the limiting factor with system voltage strong correlation is accessed automatic voltage adjusting device, make generating set under-excitation ability according to the limiting factor data acquisition of actual measurement, thus reach the object of dynamic conditioning unit under-excitation ability, more and more severeer in the superfluous situation of electric network reactive-load, electrical network continues to increase today that reactor drops into, dynamical min unit under-excitation ability, not only can give full play to generating set under-excitation ability when system voltage is higher, absorption grid excess is idle, improve safe operation of electric network level, decrease reactor input cost and O&M cost simultaneously, this kind of beyond doubt very meaningful thing with having economic worth, automatic voltage adjusting device out of servicely can need not can increase operation of power networks intelligent level and electric power netting safe running level between electrical network low-load period under the prerequisite of safe operation in addition.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention.
Fig. 2 is the logical design schematic diagram of automatism voltage control device.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
Based on the generating set under-excitation ability dynamical min method of measured data, comprise the following steps:
Step one, carries out generating set leading phase test, generating set under-excitation ability and limiting factor under acquisition accidental conditions.
Step 2, if limiting factor and system voltage strong correlation, then the generating set under-excitation ability that current test obtains fluctuates with electric network state, goes to step three; Set end voltage, station-service voltage and system voltage is comprised with the limiting factor of system voltage strong correlation;
If limiting factor is weak relevant to system voltage, then the generating set under-excitation ability that current test obtains is the under-excitation ability of generating set itself, does not possess dynamical min space, then terminate to excavate; Merit angle, temperature and stator current is comprised to the weak relevant limiting factor of system voltage.
Step 3, switching station service to playing standby change, getting rid of the limiting factor with system voltage strong correlation, carrying out leading phase test, according to relevant limiting factor weak to system voltage, obtaining the under-excitation ability of generating set itself.
Step 4, encourages limiting parameter according to the relevant parameter of the under-excitation ability of generating set setting automatism voltage control device itself and the low of field regulator.
Step 5, accesses automatism voltage control device by the limiting factor with system voltage strong correlation, design logic in automatism voltage control device, to determine increasing magnetic and the demagnetize operation of generating set.
The logic of design can refer to but is not limited to the logic of Fig. 2 display, is specially: when limiting factor is higher than permissible value, the order of generating set demagnetize is effective; When limiting factor encounters permissible value, generating set demagnetize command expiration; When limiting factor is lower than permissible value, generating set automatically increases magnetic until limiting factor is higher than permissible value.Automatism voltage control device (AVC) carries out the operation of increase and decrease magnetic according to the limiting factor of actual measurement, thus realizes the object of dynamical min unit under-excitation ability.
Such as: limiting factor is the 400V busbar voltage of Auxiliary System in Power Plant, when the bus voltage value that this 400V bus voltage value allows safely higher than generating set, the order of generating set demagnetize is effective; When this 400V bus voltage value encounters permissible value, the demagnetize command expiration of generating set; When this 400V bus voltage value is lower than permissible value, generating set automatically increases magnetic until this 400V bus voltage value is higher than permissible value.
Above-mentioned method is by carrying out leading phase test having switched in standby change, get rid of the limiting factor with system voltage strong correlation, obtain the under-excitation ability of generating set itself, as automatic voltage adjusting device and the low boundary condition of encouraging restriction and adjusting of field regulator, guarantee generating set safe operation under this condition, then the limiting factor with system voltage strong correlation is accessed automatic voltage adjusting device, make generating set under-excitation ability according to the limiting factor data acquisition of actual measurement, thus reach the object of dynamic conditioning unit under-excitation ability.
More and more severeer in the superfluous situation of electric network reactive-load, electrical network continues to increase today that reactor drops into, dynamical min unit under-excitation ability, not only can give full play to generating set under-excitation ability when system voltage is higher, absorption grid excess is idle, improve safe operation of electric network level, decrease reactor input cost and O&M cost simultaneously, this kind of beyond doubt very meaningful thing with having economic worth; Automatic voltage adjusting device out of servicely can need not can increase operation of power networks intelligent level and electric power netting safe running level between electrical network low-load period under the prerequisite of safe operation in addition.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (2)
1., based on the generating set under-excitation ability dynamical min method of measured data, it is characterized in that: comprise the following steps,
Step one, carries out generating set leading phase test, generating set under-excitation ability and limiting factor under acquisition accidental conditions;
Step 2, if limiting factor and system voltage strong correlation, then the generating set under-excitation ability that current test obtains fluctuates with electric network state, goes to step three; Set end voltage, station-service voltage and system voltage is comprised with the limiting factor of system voltage strong correlation;
If limiting factor is weak relevant to system voltage, then the generating set under-excitation ability that current test obtains is the under-excitation ability of generating set itself, does not possess dynamical min space, then terminate to excavate; Merit angle, temperature and stator current is comprised to the weak relevant limiting factor of system voltage;
Step 3, switching station service to playing standby change, getting rid of the limiting factor with system voltage strong correlation, carrying out leading phase test, according to relevant limiting factor weak to system voltage, obtaining the under-excitation ability of generating set itself;
Step 4, encourages limiting parameter according to the relevant parameter of the under-excitation ability of generating set setting automatism voltage control device itself and the low of field regulator;
Step 5, accesses automatism voltage control device by the limiting factor with system voltage strong correlation, design logic in automatism voltage control device, to determine increasing magnetic and the demagnetize operation of generating set.
2. the generating set under-excitation ability dynamical min method based on measured data according to claim 1, is characterized in that: the logic of design is, when limiting factor is higher than permissible value, the order of generating set demagnetize is effective; When limiting factor encounters permissible value, generating set demagnetize command expiration; When limiting factor is lower than permissible value, generating set automatically increases magnetic until limiting factor is higher than permissible value.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105785188A (en) * | 2016-04-12 | 2016-07-20 | 国网江苏省电力公司电力科学研究院 | High-capacity phase modifier test method with small power grid influence |
| CN106099979A (en) * | 2016-07-19 | 2016-11-09 | 国网河北省电力公司电力科学研究院 | A kind of unit under-excitation ability considering that the stabilization of power grids limits analyzes method |
| CN106842022A (en) * | 2017-01-16 | 2017-06-13 | 国网江苏省电力公司电力科学研究院 | A kind of test method for lifting generating set under-excitation ability |
| CN106849059A (en) * | 2017-01-16 | 2017-06-13 | 国网江苏省电力公司电力科学研究院 | Generating set under-excitation ability method for digging based on analog simulation |
| CN111697632A (en) * | 2020-07-07 | 2020-09-22 | 北京京能高安屯燃气热电有限责任公司 | Generator reactive power control method and device based on automatic voltage control substation |
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| CN105785188A (en) * | 2016-04-12 | 2016-07-20 | 国网江苏省电力公司电力科学研究院 | High-capacity phase modifier test method with small power grid influence |
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| CN106099979A (en) * | 2016-07-19 | 2016-11-09 | 国网河北省电力公司电力科学研究院 | A kind of unit under-excitation ability considering that the stabilization of power grids limits analyzes method |
| CN106842022A (en) * | 2017-01-16 | 2017-06-13 | 国网江苏省电力公司电力科学研究院 | A kind of test method for lifting generating set under-excitation ability |
| CN106849059A (en) * | 2017-01-16 | 2017-06-13 | 国网江苏省电力公司电力科学研究院 | Generating set under-excitation ability method for digging based on analog simulation |
| CN106842022B (en) * | 2017-01-16 | 2019-03-19 | 国网江苏省电力公司电力科学研究院 | A kind of test method promoting generating set under-excitation ability |
| CN111697632A (en) * | 2020-07-07 | 2020-09-22 | 北京京能高安屯燃气热电有限责任公司 | Generator reactive power control method and device based on automatic voltage control substation |
| CN111697632B (en) * | 2020-07-07 | 2023-06-09 | 北京京能高安屯燃气热电有限责任公司 | Generator reactive power control method and device based on automatic voltage control substation |
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