CN105353211B - A kind of test method of load cell frequency characteristic - Google Patents
A kind of test method of load cell frequency characteristic Download PDFInfo
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- CN105353211B CN105353211B CN201510794502.0A CN201510794502A CN105353211B CN 105353211 B CN105353211 B CN 105353211B CN 201510794502 A CN201510794502 A CN 201510794502A CN 105353211 B CN105353211 B CN 105353211B
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- 238000010998 test method Methods 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 32
- 238000005406 washing Methods 0.000 claims description 9
- 238000004088 simulation Methods 0.000 claims description 7
- 238000004378 air conditioning Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 240000002853 Nelumbo nucifera Species 0.000 claims 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 7
- 229910052708 sodium Inorganic materials 0.000 description 7
- 239000011734 sodium Substances 0.000 description 7
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- 238000012544 monitoring process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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Abstract
The present invention provides a kind of test method of load cell frequency characteristic, comprising the following steps: builds the valve systems such as practical；Using the frequency characteristic of practical equivalent system testing load cell；Analyze test result.The test method of load cell frequency characteristic provided by the invention overcomes actual power system frequency and fluctuates the small difficulty for being not easy to survey, can keep load cell busbar voltage it is constant in the case where making frequency adjustment, simultaneously, the variation of frequency can be adjusted in a big way, and then obtain the frequency characteristic of load cell.Test method provided by the invention is easily achieved, and is widely used.
Description
Technical field
The present invention relates to a kind of test methods, and in particular to a kind of test method of load cell frequency characteristic.
Background technique
Power system frequency is one of most important operation data in Operation of Electric Systems, and the exception of frequency can give generator
Serious consequence is brought with the safe and stable operation of system, while damaging electrical equipment.Therefore it on the one hand needs to run in system
Carrying out dynamic monitoring to frequency in the process makes it as the important state of implementation system security and stability control, on the other hand necessary
The frequency of system is controlled, maintains system frequency for example, by using automatic control devices such as LOAD FREQUENCY control, low-frequency load shedding
Stabilization.During such frequency control apparatus is configured and is adjusted, need to the dynamic frequency characteristic of power grid into
Accurately analysis, load model have very important influence to the dynamic frequency simulation curve of electric system again to row.Traditional
In load modeling research, due to consideration that the scale of targeted power grid is all very big, the capacity of ac synchronous motor is big, rotary inertia
Greatly, this varies less the frequency of system, therefore the frequency variation of system is often had ignored during load modeling.In recent years
Come, the considerations of with various countries to environment and energy security problem, extensive as the generation of electricity by new energy mode of representative using wind-power electricity generation
Application is arrived.As being continuously increased for wind-power electricity generation capacity is continuously improved with ratio of the wind-powered electricity generation capacity in power grid, wind power output
Fluctuation the frequency characteristic of power grid is had an impact, may cause biggish frequency fluctuation.Meanwhile being with power electronic technique
Micro-capacitance sensor technology based on core, distributed generation resource is increasingly mature, and the development of micro-capacitance sensor has become trend.For micro-capacitance sensor
Perhaps the weaker small electrical system (such as Tibet Power Grid) of network structure after breaking down or encounters greater impact
It when load, will lead to that local system power is seriously uneven, and frequency also will appear biggish fluctuation, even result in the frequency of system
It is unstable.Therefore, frequency bring cannot be ignored when carrying out load modeling for electric system as described above influences, it is necessary to
Consider the frequency characteristic of load.If studying the frequency characteristic of load it is necessary to grasp the frequency characteristic of main loads element.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of test method of load cell frequency characteristic,
By building test of the valve systems completion such as practical to load cell frequency characteristic.
In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme that:
The present invention provides a kind of test method of load cell frequency characteristic, the test method the following steps are included:
Step 1: building the valve systems such as practical；
Step 2: using the frequency characteristic of practical equivalent system testing load cell；
Step 3: analysis test result.
In the step 1, the valve systems such as practical include infinitely great equivalent AC system, equivalent generator, step-down transformer,
Distribution transformer, route, 220kV bus, 110kV bus, 10.5kV bus, breaker and load cell；
The infinitely great equivalent AC system and equivalent generator are connect by route with 220kV bus, step-down transformer
High-pressure side connect 220kV bus, low-pressure side connect 110kV bus；110kV bus connects distribution transformer by breaker
High-pressure side, the low-pressure side 10.5kV bus connected load element of distribution transformer.
The load cell includes computer, electric oven, micro-wave oven, refrigerator, washing machine, air-conditioning and industrial motor.
The frequency change step of the valve systems such as practical is set as 0.5Hz, the step 2 the following steps are included:
Step 2-1: keeping the voltage V of 10.5kV bus constant, will be practical by adjusting the active power of equivalent generator
The frequency f of equal valve systems is adjusted to 47Hz, tests and save the active power and reactive power of load cell；
Step 2-2: keeping the voltage V of 10.5kV bus constant, will be practical by adjusting the active power of equivalent generator
The frequency f of equal valve systems is adjusted to 47.5Hz, tests and save the active power and reactive power of load cell；
Step 2-3: and so on, it according to the frequency change step of 0.5Hz, keeps the voltage V of 10.5kV bus constant, leads to
It crosses and adjusts the active power of equivalent generator and successively adjusts the frequency f of the valve systems such as practical, until by the frequency of the valve systems such as actually
Rate f is adjusted to 53Hz, tests and save the active power and reactive power of load cell；
Step 2-4: keeping the voltage V of 10.5kV bus constant, will be by reality by adjusting the active power of equivalent generator
The frequency f of the valve systems such as border is adjusted to 52.5Hz, tests and save the active power and reactive power of load cell；
Step 2-5: keeping the voltage V of 10.5kV bus constant, will be by reality by adjusting the active power of equivalent generator
The frequency f of the valve systems such as border is adjusted to 52Hz, tests and save the active power and reactive power of load cell；
Step 2-6: and so on, it according to the frequency change step of 0.5Hz, keeps the voltage V of 10.5kV bus constant, leads to
It crosses and adjusts the active power of equivalent generator and successively adjusts the frequency f of the valve systems such as practical, until by the frequency of the valve systems such as actually
Rate f is adjusted to 47Hz, tests and save the active power and reactive power of load cell.
In the step 3, test result include the valve systems such as different reality frequency f under load cell active power and
Reactive power, carrying out analysis to test result includes:
Step 3-1: active power simulation than using K with reactive power simulation ratio respectivelyPAnd KQIt indicates, and KP=KQ, have:
Wherein, SPyIndicate the famous value of active power of load cell in practical power systems, SPmIndicate the valve systems such as practical
The famous value of the active power of middle load cell, SQyIndicate the famous value of reactive power of load cell in practical power systems, SQmTable
Show the famous value of reactive power of load cell in the valve systems such as practical；
The famous value S of active power for respectively obtaining load cell in practical power systems according to formula (1) and (2)PyAnd reality
The famous value S of the reactive power of load cell in electric systemQy；
Step 3-2: formed practical power systems in load cell active power tables of data varying with frequency and and
Reactive power tables of data varying with frequency；
Step 3-3: according to the active power of load cell in the practical power systems of formation tables of data varying with frequency
And the frequency characteristic of load cell is drawn with reactive power tables of data varying with frequency.
Compared with the immediate prior art, technical solution provided by the invention is had the advantages that
1) it is small to overcome actual power system frequency fluctuation for the test method of load cell frequency characteristic provided by the invention
Be not easy the difficulty surveyed, can keep load cell busbar voltage it is constant in the case where making frequency adjustment；
2) test method of load cell frequency characteristic provided by the invention can adjust the change of frequency in a big way
Change, and then obtains the frequency characteristic of load cell；
3) test method of load cell frequency characteristic provided by the invention is to establish the load for considering frequency character of load
Model modeling provides technical support；
4) test method of load cell frequency characteristic provided by the invention is easily achieved, and is widely used.
Detailed description of the invention
Fig. 1 is practical equivalence system construction drawing in the embodiment of the present invention；
Fig. 2 is washing machine active power-frequency characteristic schematic diagram in the embodiment of the present invention；
Fig. 3 is washing machine reactive power-frequency characteristic schematic diagram in the embodiment of the present invention；
Fig. 4 is sodium vapor lamp active power-frequency characteristic schematic diagram in the embodiment of the present invention；
Fig. 5 is sodium vapor lamp reactive power-frequency characteristic schematic diagram in the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
The present invention provides a kind of test method of load cell frequency characteristic, the test method the following steps are included:
Step 1: building the valve systems such as practical；
Step 2: using the frequency characteristic of practical equivalent system testing load cell；
Step 3: analysis test result.
The load cell includes computer, electric oven, micro-wave oven, refrigerator, washing machine, air-conditioning and industrial motor.
In the step 1, the valve systems such as practical include infinitely great equivalent AC system, equivalent generator, step-down transformer,
Distribution transformer, route, 220kV bus, 110kV bus, 10.5kV bus, breaker and load cell；
The infinitely great equivalent AC system and equivalent generator are connect by route with 220kV bus, step-down transformer
High-pressure side connect 220kV bus, low-pressure side connect 110kV bus；110kV bus connects distribution transformer by breaker
High-pressure side, the low-pressure side 10.5kV bus connected load element of distribution transformer.
The frequency change step of the valve systems such as practical is set as 0.5Hz, the step 2 the following steps are included:
Step 2-1: keeping the voltage V of 10.5kV bus constant, will be practical by adjusting the active power of equivalent generator
The frequency f of equal valve systems is adjusted to 47Hz, tests and save the active power and reactive power of load cell；
Step 2-2: keeping the voltage V of 10.5kV bus constant, will be practical by adjusting the active power of equivalent generator
The frequency f of equal valve systems is adjusted to 47.5Hz, tests and save the active power and reactive power of load cell；
Step 2-3: and so on, it according to the frequency change step of 0.5Hz, keeps the voltage V of 10.5kV bus constant, leads to
It crosses and adjusts the active power of equivalent generator and successively adjusts the frequency f of the valve systems such as practical, until by the frequency of the valve systems such as actually
Rate f is adjusted to 53Hz, tests and save the active power and reactive power of load cell；
Step 2-4: keeping the voltage V of 10.5kV bus constant, will be by reality by adjusting the active power of equivalent generator
The frequency f of the valve systems such as border is adjusted to 52.5Hz, tests and save the active power and reactive power of load cell；
Step 2-5: keeping the voltage V of 10.5kV bus constant, will be by reality by adjusting the active power of equivalent generator
The frequency f of the valve systems such as border is adjusted to 52Hz, tests and save the active power and reactive power of load cell；
Step 2-6: and so on, it according to the frequency change step of 0.5Hz, keeps the voltage V of 10.5kV bus constant, leads to
It crosses and adjusts the active power of equivalent generator and successively adjusts the frequency f of the valve systems such as practical, until by the frequency of the valve systems such as actually
Rate f is adjusted to 47Hz, tests and save the active power and reactive power of load cell.
In the step 3, test result include the valve systems such as different reality frequency f under load cell active power and
Reactive power, carrying out analysis to test result includes:
Step 3-1: active power simulation than using K with reactive power simulation ratio respectivelyPAnd KQIt indicates, and KP=KQ, have:
Wherein, SPyIndicate the famous value of active power of load cell in practical power systems, SPmIndicate the valve systems such as practical
The famous value of the active power of middle load cell, SQyIndicate the famous value of reactive power of load cell in practical power systems, SQmTable
Show the famous value of reactive power of load cell in the valve systems such as practical；
The famous value S of active power for respectively obtaining load cell in practical power systems according to formula (1) and (2)PyAnd reality
The famous value S of the reactive power of load cell in electric systemQy；
Step 3-2: formed practical power systems in load cell active power tables of data varying with frequency and and
Reactive power tables of data varying with frequency；
Step 3-3: according to the active power of load cell in the practical power systems of formation tables of data varying with frequency
And the frequency characteristic of load cell is drawn with reactive power tables of data varying with frequency.
Embodiment 1
The valve systems such as practical are built, as shown in Fig. 1, using tertiary voltage system, respectively 220kV, 110kV,
10.5kV electrical voltage system, infinitely great equivalence AC system by 220kV route L2 through 220kV/110kV step-down transformer (T1,
T2) 220kV is depressured as 110kV voltage.110kV electrical voltage system respectively through 4 110kV/10.5kV distribution transformers (B3, B4,
B5, B6) it is connect with different load element, equivalent generator G1, equivalence generator G2 access 220kV bus.
K1, K2, K3, K4 are low-voltage protective switch in Fig. 1, and load transformer B3 is accessed through 10kV route L3 and Switch K1
Induction-motor load；Load transformer B4 is successively respectively connected to incandescent lamp, fluorescent lamp and sodium vapor lamp etc. through 10kV route L4 and switch K2
Load cell；Load transformer B5 is successively respectively connected to the loads such as washing machine, air-conditioning, refrigerator member through 10kV route L5 and switch K3
Part；Load transformer B6 is respectively connected to the loads such as electromagnetic oven, micro-wave oven, electric oven, computer through 10kV route L6 and switch K4
Element.
Washing machine is accessed in K3, the input power of washing machine is 450W；
Close K3 and BK7, the valve systems such as washing machine access reality.Under the conditions of the voltage of 10.5kV bus remains unchanged,
Data measured and being converted into is shown in Table 1 after the famous value of practical power systems, active power frequency characteristic and reactive power frequency
Rate characteristic curve is respectively such as attached drawing 2 and Fig. 3.
Table 1
Sodium vapor lamp is accessed in K3, the power of sodium vapor lamp is 1000W.Close K2 and BK6, the valve systems such as sodium lamp access reality.?
Under the conditions of the voltage of 10.5kV bus remains unchanged, data measured is simultaneously converted into sodium vapor lamp static frequency attribute testing portion after famous value
Divided data is shown in Table 2, and frequency characteristic is shown in attached drawing 4 and Fig. 5.
Table 2
| Frequency (Hz) | 53 | 52 | 51 | 50 | 49 | 48 | 47.5 | 47.1 |
| Active power (W) | 1398 | 1435 | 1453 | 1480 | 1510 | 1550 | 1579 | 1592 |
| Reactive power (Var) | 976 | 1060 | 1170 | 1220 | 1280 | 1310 | 1334 | 1364 |
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field can still modify to a specific embodiment of the invention referring to above-described embodiment or
Equivalent replacement, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent replacement
Within bright claims.
Claims (1)
1. a kind of test method of load cell frequency characteristic, it is characterised in that: the test method the following steps are included:
Step 1: building the valve systems such as practical；
Step 2: using the frequency characteristic of practical equivalent system testing load cell；
Step 3: analysis test result；
In the step 1, the valve systems such as practical include infinitely great equivalent AC system, equivalent generator, step-down transformer, distribution
Transformer, route, 220kV bus, 110kV bus, 10.5kV bus, breaker and load cell；
The infinitely great equivalent AC system and equivalent generator are connect by route with 220kV bus, the height of step-down transformer
Side is pressed to connect 220kV bus, low-pressure side connects 110kV bus；110kV bus connects the height of distribution transformer by breaker
Press side, the low-pressure side 10.5kV bus connected load element of distribution transformer；
The load cell includes computer, electric oven, micro-wave oven, refrigerator, washing machine, air-conditioning and industrial motor；
The frequency change step of the valve systems such as practical is set as 0.5Hz, the step 2 the following steps are included:
Step 2-1: keeping the voltage V of 10.5kV bus constant, will be practical equivalent by adjusting the active power of equivalent generator
The frequency f of system is adjusted to 47Hz, tests and save the active power and reactive power of load cell；
Step 2-2: keeping the voltage V of 10.5kV bus constant, will be practical equivalent by adjusting the active power of equivalent generator
The frequency f of system is adjusted to 47.5Hz, tests and save the active power and reactive power of load cell；
Step 2-3: and so on, according to the frequency change step of 0.5Hz, keeps the voltage V of 10.5kV bus constant, pass through tune
The active power of whole equivalence generator successively adjusts the frequency f of the valve systems such as practical, until by the frequency f tune of the valve systems such as actually
The active power and reactive power of load cell are tested and saved to section to 53Hz；
Step 2-4: keeping the voltage V of 10.5kV bus constant, will will be practical etc. by adjusting the active power of equivalent generator
The frequency f of valve system is adjusted to 52.5Hz, tests and save the active power and reactive power of load cell；
Step 2-5: keeping the voltage V of 10.5kV bus constant, will will be practical etc. by adjusting the active power of equivalent generator
The frequency f of valve system is adjusted to 52Hz, tests and save the active power and reactive power of load cell；
Step 2-6: and so on, according to the frequency change step of 0.5Hz, keeps the voltage V of 10.5kV bus constant, pass through tune
The active power of whole equivalence generator successively adjusts the frequency f of the valve systems such as practical, until by the frequency f tune of the valve systems such as actually
The active power and reactive power of load cell are tested and saved to section to 47Hz；
In the step 3, test result include the valve systems such as different reality frequency f under the active power of load cell and idle
Power, carrying out analysis to test result includes:
Step 3-1: active power simulation than using K with reactive power simulation ratio respectivelyPAnd KQIt indicates, and KP=KQ, have:
Wherein, SPyIndicate the famous value of active power of load cell in practical power systems, SPmIt indicates to bear in the valve systems such as practical
The famous value of the active power of lotus element, SQyIndicate the famous value of reactive power of load cell in practical power systems, SQmIndicate real
The famous value of the reactive power of load cell in the valve systems such as border；
The famous value S of active power for respectively obtaining load cell in practical power systems according to formula (1) and (2)PyWith practical electric power
The famous value S of the reactive power of load cell in systemQy；
Step 3-2: formed practical power systems in load cell active power tables of data varying with frequency and with it is idle
The tables of data of power with frequency variation；
Step 3-3: according to the active power of load cell in the practical power systems of formation tables of data varying with frequency and
The frequency characteristic of load cell is drawn with reactive power tables of data varying with frequency.
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| CN103501007A (en) * | 2013-09-30 | 2014-01-08 | 南京南瑞集团公司 | Low-frequency and low-voltage load reduction control method considering comprehensive load regulation characteristic |
| CN103595040A (en) * | 2013-11-21 | 2014-02-19 | 国网上海市电力公司 | Power distribution network comprising direct-current distributed power supply and analysis method of comprehensive load characteristics of power distribution network |
| CN104897956A (en) * | 2015-05-18 | 2015-09-09 | 华南理工大学 | Method for online actively measuring active power and frequency characteristic factors of power grid |
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| US20100070227A1 (en) * | 2008-09-18 | 2010-03-18 | Searete Llc, A Limited Liability Corporation Of The State Of Delaware | System and method for identifying appliances by electrical characteristics |
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| CN103501007A (en) * | 2013-09-30 | 2014-01-08 | 南京南瑞集团公司 | Low-frequency and low-voltage load reduction control method considering comprehensive load regulation characteristic |
| CN103595040A (en) * | 2013-11-21 | 2014-02-19 | 国网上海市电力公司 | Power distribution network comprising direct-current distributed power supply and analysis method of comprehensive load characteristics of power distribution network |
| CN104897956A (en) * | 2015-05-18 | 2015-09-09 | 华南理工大学 | Method for online actively measuring active power and frequency characteristic factors of power grid |
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