CN102723773A - Frequency changing direction-based synchronization capturing closing method of rapid power switching apparatus - Google Patents
Frequency changing direction-based synchronization capturing closing method of rapid power switching apparatus Download PDFInfo
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- CN102723773A CN102723773A CN2011103368844A CN201110336884A CN102723773A CN 102723773 A CN102723773 A CN 102723773A CN 2011103368844 A CN2011103368844 A CN 2011103368844A CN 201110336884 A CN201110336884 A CN 201110336884A CN 102723773 A CN102723773 A CN 102723773A
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Abstract
The invention discloses a frequency changing direction-based synchronization capturing closing method of a rapid power switching apparatus. Frequency changing directions of a power-lossing bus are monitored in real time and it is monitored whether there is an ascending or descending direction; and a synchronization capturing closing calculation formula is dynamically adjusted based on the changing directions. When a corresponding formula and a corresponding condition are met, closing operation is carried out. According to the invention, beneficial effects are as follows: the method, which has advantages of simpleness, explicitness, and sensitiveness, can be easily applied to a rapid power switching apparatus; the application range is wide; and a success rate of closing is high; and a risk that a synchronous motor or a generator is shocked by heavy currents can be reduced.
Description
Technical field
The present invention relates to a kind of power supply rapid switching device and catch closing switch method the same period, be applicable to electric power systems such as thermal power plant, petrochemical industry, iron and steel, metallurgy, coal based on the frequency change direction.
Background technology
In important power supply occasion, generally adopt the dual power supply pattern to improve power supply reliability.When working power take place various have influence on the unusual or fault of producing the normal operation of load after, must apace the stand-by power supply input normally be carried out with what guarantee to produce.Usually use power supply rapid switching device to realize the switching between working power and the stand-by power supply at present.Catching the combined floodgate mode same period is the most frequently used combined floodgate mode of power supply rapid switching device.
It is narrower to catch the combined floodgate mode scope of application traditional same period, and the situation of asynchronous motor load is arranged on the only suitable bus.Yet, begin to occur electric equipments such as synchronous motor, small generator on many buses along with the improvement of the technological process of production.The Electric dynamic characteristic difference of these equipment and asynchronous motor is very big, catches the combined floodgate mode traditional same period and is difficult on the adaptation bus synchronous motor or small generator situation are arranged, and the combined floodgate success rate is low and the combined floodgate impulse current is big.
Summary of the invention
Be technical deficiency more than solving, the invention provides a kind of applied widely, can be with stand-by power supply
The power supply rapid switching device based on the frequency change direction that drops into is quickly and safely caught closing switch method the same period.
The present invention realizes through following measure:
Power supply rapid switching device based on the frequency change direction of the present invention is caught closing switch method the same period, may further comprise the steps:
A. detect the frequency f of outage back busbar voltage and the angle theta between voltage phasor in real time,, carry out step b,, carry out step c if electric voltage frequency rises if electric voltage frequency descends;
B. calculate the current formula (1) that whether satisfies, if, carry out step e, if not, then stop;
|（360－θ）－（360?*?f?*?T?+?180?*?|df/dt|?*?T?*?T）|?<?ε （1）
Wherein T is the intrinsic closing time of backup circuit breaker, the error of ε for allowing;
C. calculate the current formula (2) that whether satisfies, if, carry out steps d, if not, then stop;
|?θ－（360?*?f?*?T?+?180?*?|df/dt|?*?T?*?T）|?<?ε （2）
D. judge whether to satisfy fmin ﹤ f ﹤ fmax, if, carry out step e, if not, then stop, wherein fmin is the setpoint frequency minimum value, fmax is the setpoint frequency maximum;
E. meet the combined floodgate condition, carry out closing operation.
The adjusting range of above-mentioned fmin is 46.00Hz ~ 49.00Hz, and the adjusting range of fmax is 50.50Hz ~ 53.00Hz.
The invention has the beneficial effects as follows: 1. the major part of criterion of the present invention is based on bus frequency change direction (rising/decline); Dynamically adjust and catch the combined floodgate computing formula same period; Clear physics conception is clear and definite; Method is simple, clear and definite, sensitive, can be integrated in the power supply rapid switching device easily.2. criterion of the present invention both had been applicable to the asynchronous motor load, also was applicable to synchronous motor/gen-set, applied range, and the combined floodgate success rate is high.3. the present invention is provided with the assistant criteria of inspection safety frequency scope, reduces the risk that synchronous motor or generator receive heavy current impact effectively.
Description of drawings
Among the figure
; When 1. the busbar voltage frequency descends, busbar voltage and backup power source voltage phasor rotation tendency chart;
When 2. the busbar voltage frequency rises, busbar voltage and backup power source voltage phasor rotation tendency chart;
Fig. 2 is a combined floodgate condition block diagram;
Embodiment
Like Fig. 1, shown in 2; At first; Voltage phasor rotation signature analysis is following under the different frequency change direction: when asynchronous motor (though or synchronous motor/generator is arranged, asynchronous motor proportion is bigger) was only arranged on bus, dead electricity busbar voltage frequency was with on a declining curve.Angle between busbar voltage phasor and the backup power source voltage phasor is the change main trend.If with the stand-by power supply voltage phasor is with reference to phasor, then the busbar voltage phasor is to turn clockwise.As among Fig. 1 1., Um is the busbar voltage phasor, Uby is the backup power source voltage phasor.
When synchronous motor on the bus or generator capacity when big (being that asynchronous motor proportion is less relatively), dead electricity busbar voltage frequency maybe be in rising trend.Angle between busbar voltage phasor and the backup power source voltage phasor will be the trend of dwindling in the case.If with the stand-by power supply voltage phasor is with reference to phasor, then the busbar voltage phasor is to be rotated counterclockwise.As among Fig. 1 2., Um is the busbar voltage phasor, Uby is the backup power source voltage phasor.
Know the direction of rotation of phasor, combined the moment that the same period, point occurred that calculates that bus frequency values, bus frequency change speed, current phase angle difference (this tittle can directly measure) just can be correct again.The computational methods of the voltage phasor point same period are different under two kinds of changing patteries.The present invention adjusts the computational methods of the some same period according to bus frequency change direction (rising/decline), makes no matter the combined floodgate logic is to the asynchronous motor load, or synchronous motor/generator load, can both correctly work.
Synchronous motor or generator all are valuable equipment, and the shock resistance current capacity also can not show a candle to asynchronous motor, so the combined floodgate logic, also is provided with the assistant criteria of inspection safety frequency scope to the situation of synchronous motor or generator is arranged on the bus.
Particularly, under two kinds of frequency change patterns, to the some same period first time, the angular displacement computational methods that should pass by are different to the busbar voltage phasor from current location.As shown in Figure 1, if the busbar voltage frequency is on a declining curve, then angular displacement should be 360-θ degree; If the bus frequency is in rising trend, then angular displacement should be the θ degree.Wherein, θ representes the angle between current voltage phasor.
Criterion is following during combined floodgate.Drop to example with the busbar voltage frequency.If current bus frequency is f (unit is hertz); Bus frequency decrease speed is
(unit is a hertz/sec), and the intrinsic closing time of backup circuit breaker is T (unit is second).Then T is in the time, and the angular displacement that bus can be passed by is:
.If " angular displacement that bus should be passed by " is close with " angular displacement that bus can be passed by ", then this moment, the combined floodgate condition satisfied.That is:
In the formula:
" 360-θ " for arriving before first of some the angular displacement that the busbar voltage phasor should be passed by same period;
The error of ε for allowing.
Same derivation can get, and the combined floodgate condition was following when the busbar voltage frequency rose.
Specifically may further comprise the steps:
A. detect the frequency f of outage back busbar voltage and the angle theta between voltage phasor in real time,, carry out step b,, carry out step c if electric voltage frequency rises if electric voltage frequency descends;
B. calculate the current formula (1) that whether satisfies, if, carry out step e, if not, then stop;
（1）
Wherein T is the intrinsic closing time of backup circuit breaker, the error of ε for allowing;
C. calculate the current formula (2) that whether satisfies, if, carry out steps d, if not, then stop;
D. judge whether to satisfy fmin ﹤ f ﹤ fmax, if, carry out step e, if not, then stop, wherein fmin is the setpoint frequency minimum value, fmax is the setpoint frequency maximum;
E. meet the combined floodgate condition, carry out closing operation.
The adjusting range of fmin is 46.00Hz ~ 49.00Hz, and the adjusting range of fmax is 50.50Hz ~ 53.00Hz.The fail safe of closing a floodgate when this definite value is used for guaranteeing synchronous motor/generator can be adjusted according to actual conditions when operation.
The foregoing description is said to be in order to specify this patent; Though describe through specific term in the literary composition; But can not limit the protection range of this patent with this; The personage who is familiar with this technical field can change or revise it after the spirit of understanding this patent and principle and reach equivalent purpose, and this equivalence change and modification all should be covered by the claim scope and define in the category.
Claims (2)
1. the power supply rapid switching device based on the frequency change direction is caught closing switch method the same period, it is characterized in that, may further comprise the steps:
A. detect the frequency f of outage back busbar voltage and the angle theta between voltage phasor in real time,, carry out step b,, carry out step c if electric voltage frequency rises if electric voltage frequency descends;
B. calculate the current formula (1) that whether satisfies, if, carry out step e, if not, then stop;
Wherein T is the intrinsic closing time of backup circuit breaker, the error of ε for allowing;
C. calculate the current formula (2) that whether satisfies, if, carry out steps d, if not, then stop;
D. judge whether to satisfy fmin ﹤ f ﹤ fmax, if, carry out step e, if not, then stop, wherein fmin is the setpoint frequency minimum value, fmax is the setpoint frequency maximum;
E. meet the combined floodgate condition, carry out closing operation.
2. the power supply rapid switching device based on the frequency change direction is caught closing switch method the same period, it is characterized in that:
The adjusting range of fmin is 46.00Hz ~ 49.00Hz, and the adjusting range of fmax is 50.50Hz ~ 53.00Hz.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944762A (en) * | 2012-12-01 | 2013-02-27 | 新余钢铁集团有限公司 | Debugging method of phase sequences of loops at two sides of synchronization point before commissioning of generator set |
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| CN100397749C (en) * | 2005-08-31 | 2008-06-25 | 国电南京自动化股份有限公司 | Quick switch method of judged by current |
| CN201374585Y (en) * | 2009-01-16 | 2009-12-30 | 上海合富共展机电科技有限公司 | Undisturbed stability control device |
| CN101795017A (en) * | 2009-12-18 | 2010-08-04 | 江苏金智科技股份有限公司 | Method for quickly switching and starting power supplies of industrial enterprises based on frequency and voltage variations |
| CN101917058A (en) * | 2010-08-26 | 2010-12-15 | 深圳市国立智能电力科技有限公司 | Method and system for switching backup power supply |
| CN201690267U (en) * | 2010-06-04 | 2010-12-29 | 上海致达智利达系统控制有限责任公司 | Synthetic protective device capable of realizing power rapid-switch for nuclear power plant |
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- 2011-10-31 CN CN2011103368844A patent/CN102723773A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397749C (en) * | 2005-08-31 | 2008-06-25 | 国电南京自动化股份有限公司 | Quick switch method of judged by current |
| CN201374585Y (en) * | 2009-01-16 | 2009-12-30 | 上海合富共展机电科技有限公司 | Undisturbed stability control device |
| CN101795017A (en) * | 2009-12-18 | 2010-08-04 | 江苏金智科技股份有限公司 | Method for quickly switching and starting power supplies of industrial enterprises based on frequency and voltage variations |
| CN201690267U (en) * | 2010-06-04 | 2010-12-29 | 上海致达智利达系统控制有限责任公司 | Synthetic protective device capable of realizing power rapid-switch for nuclear power plant |
| CN101917058A (en) * | 2010-08-26 | 2010-12-15 | 深圳市国立智能电力科技有限公司 | Method and system for switching backup power supply |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944762A (en) * | 2012-12-01 | 2013-02-27 | 新余钢铁集团有限公司 | Debugging method of phase sequences of loops at two sides of synchronization point before commissioning of generator set |
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Application publication date: 20121010 |