CN114050641A - Rapid switching-on method of power supply rapid switching-off device based on healthy and complete phases - Google Patents
Rapid switching-on method of power supply rapid switching-off device based on healthy and complete phases Download PDFInfo
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- CN114050641A CN114050641A CN202111389315.6A CN202111389315A CN114050641A CN 114050641 A CN114050641 A CN 114050641A CN 202111389315 A CN202111389315 A CN 202111389315A CN 114050641 A CN114050641 A CN 114050641A
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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Abstract
The invention discloses a fast switching-on method of a power supply fast switching device based on a healthy phase, which comprises the following steps: measuring the frequency and the phase of the three-phase voltage of the bus: separately store t0、t1、t2Frequency difference and phase difference corresponding to the three moments; and selecting the phase with the maximum amplitude from three-phase voltages of the bus Ua, Ub and Uc as a healthy phase. And (3) taking a 2-out-of-3 rapid switching-on decision based on the healthy phase, namely taking frequency difference data of 0ms, 10ms and 15ms on a healthy phase channel, respectively carrying out basic rapid switching-on logic judgment, and judging that the final rapid switching-on logic is satisfied if two of the 3 results meet the conditions. The invention can avoid the influence of the voltage waveform distortion on the rapid switching-on success rate of the rapid switching-off device to the maximum extent during short circuit, and improves the success rate of power supply switching.
Description
Technical Field
The invention relates to a fast switching-on method of a power supply fast switching device based on a healthy and complete phase, and belongs to the technical field of relay protection of a power system.
Background
The power supply quick switching device is suitable for switching station service power of a power plant or switching power supplies of other industrial users, such as chemical industry, metallurgy, coal and other occasions with more high and low voltage motor loads. When the standby switch is switched on, the current impact problem caused by the frequency difference between the bus feedback voltage and the standby power supply voltage must be considered, so that the consequences of equipment tripping, equipment damage or service life shortening and the like are avoided.
DL/T1073 general technical Condition of Power plant Power supply fast switching device, the power supply fast switching device should have fast switching-on function, the basic criteria is as shown in FIG. 1.
The rapid switching-on is a switching-on mode with the fastest speed and the optimal effect. However, in engineering, the phenomenon that the quick closing is easy to cause misoperation and failure is also found. The main reason for this phenomenon is that the conventional fast switching method generally fixedly adopts frequency difference and phase difference data of a certain phase voltage to perform logic judgment. If the phase is a short-circuit fault phase, the waveform distortion causes a large frequency difference measurement error, and as a result, the quick switching-on is mistaken or refused.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a method for quickly switching on a power supply quick switching device based on a healthy phase, the principle of the method conforms to the requirement of a DL/T1073 standard on quick switching on, and the probability of misoperation and operation rejection of quick switching on can be effectively reduced.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a fast switching-on method of a power supply fast switching-off device based on a healthy phase comprises the following steps:
step 1, measuring the frequency and the phase of three-phase voltage of a bus: separately store t0、t1、t2Frequency difference and phase difference corresponding to the three moments. Wherein, t0For the moment of tripping of the operating switch, t1At the moment when the working switch is tripped, the push-forward operation is carried out2And pushing forward at the tripping moment of the working switch.
Step 2, selection of a healthy phase: and selecting the phase with the maximum amplitude from three-phase voltages of the buses Ua, Ub and Uc as a healthy phase, wherein the healthy phase is marked as x, and a, b and c represent the phase class of the three phases of the buses.
And 3, a 3-out-of-2 rapid switching-on decision based on a healthy phase: taking a robust phase x channel at t0、t1、t2The frequency difference and the phase difference corresponding to the three moments are respectively recorded as the x-phase voltage at t0Time difference of frequency df _ x _ t0X phase voltage at t0The time difference dq _ x _ t0X phase voltage at t1Time difference of frequency df _ x _ t1X phase voltage at t1The time difference dq _ x _ t1X phase voltage at t2Time difference of frequency df _ x _ t2X phase voltage at t2The time difference dq _ x _ t2Wherein df represents a frequency difference, dq represents a phase difference, and x is a phase, b phase or c phase.
And the & represents a logic AND, wherein df _ set is a rapid switching-on frequency difference constant value, dq _ set is a rapid switching-on phase difference constant value.
The robust phase x channel is at t0、t1、t2And substituting the frequency difference and the phase difference corresponding to the three moments into an equation (1), an equation (2) and an equation (3), and if at least two equations of the equation (1), the equation (2) and the equation (3) are satisfied, indicating that the healthy phase x meets the closing condition and executing closing.
Preferably: the trip time of the working switch is 0 time.
Preferably: the time when the working switch is pushed forward when jumping off is 10 ms.
Preferably: and the second moment when the working switch is pushed forward at the tripping moment is 15 ms.
Compared with the prior art, the invention has the following beneficial effects:
(1) and selecting the phase which is not influenced by the short-circuit fault or the phase which is influenced the least as a healthy phase, and reducing the measurement error of the frequency difference and the phase difference from the source.
(2) And the healthy phase algorithm is simple and efficient, and has little influence on the overall time characteristic of the rapid switch-on. The algorithm is a main calculation type in size ratio, and the calculation amount is very small.
(3) And the rapid switching-on decision based on the principle of '2 out of 3' adopts the frequency difference of 3 times of the healthy phase to carry out rapid switching-on judgment, so that the misoperation and the operation rejection caused by the calculation error of one point can be effectively avoided.
Drawings
Fig. 1 shows the existing basic criteria. In the figure, df is the frequency difference between the bus and the standby power supply at the current moment, and dq is the phase difference between the bus and the standby power supply at the current moment; df _ set is a fixed value of a rapid switching-on frequency difference; and dq _ set is a constant fast switching-on phase difference value.
Fig. 2 is a schematic diagram of storing frequency difference and phase difference of three-phase voltages, wherein a dotted line part represents a time point of storing the frequency difference and the time point of jumping on the working switch is 0 ms. The specific frequency measurement and phase measurement algorithm can be freely selected without special restriction.
Fig. 3 shows the selection of the healthy phase.
Fig. 4 is a "2 out of 3" fast switching decision based on healthy phases, where x is the phase corresponding to healthy phase, and x is a phase, b phase, or c phase. df _ x _0\ dq _ x _0 represents the frequency difference phase difference corresponding to the time of 0 ms; df _ x _10\ dq _ x _10 represents the frequency difference phase difference corresponding to the time of 10 ms; df _ x _15\ dq _ x _15 represents the frequency difference corresponding to the 15ms moment. df _ set is a fixed value of a rapid switching-on frequency difference; and dq _ set is a constant fast switching-on phase difference value. "&" represents a logical AND. "≧ 2" means "2 out of 3 conditions are true".
Fig. 5 is an overall flow chart of the present invention.
Detailed Description
The present invention is further illustrated by the following description in conjunction with the accompanying drawings and the specific embodiments, it is to be understood that these examples are given solely for the purpose of illustration and are not intended as a definition of the limits of the invention, since various equivalent modifications will occur to those skilled in the art upon reading the present invention and fall within the limits of the appended claims.
A fast switching method of a power source fast switching device based on a healthy phase, as shown in fig. 2-5, includes the following steps:
step 1, measuring the frequency and the phase of three-phase voltage of a bus: separately store t0、t1、t2Frequency difference and phase difference corresponding to the three moments. Wherein, t0For the moment of tripping of the operating switch, t1At the moment when the working switch is tripped, the push-forward operation is carried out2And pushing forward at the tripping moment of the working switch.
Step 2, selection of a healthy phase: and selecting the phase with the maximum amplitude from three-phase voltages of the buses Ua, Ub and Uc as a healthy phase, wherein the healthy phase is marked as x, and a, b and c represent the phase class of the three phases of the buses.
And 3, a 3-out-of-2 rapid switching-on decision based on a healthy phase: taking a robust phase x channel at t0、t1、t2The frequency difference and the phase difference corresponding to the three moments are respectively recorded as the x-phase voltage at t0Time difference of frequency df _ x _ t0X phase voltage at t0The time difference dq _ x _ t0X phase voltage at t1Time difference of frequency df _ x _ t1X phase voltage at t1The time difference dq _ x _ t1X phase voltage at t2Time difference of frequency df _ x _ t2X phase voltage at t2The time difference dq _ x _ t2Wherein df represents a frequency difference, dq represents a phase difference, and x is a phase, b phase or c phase.
And the & represents a logic AND, wherein df _ set is a rapid switching-on frequency difference constant value, dq _ set is a rapid switching-on phase difference constant value.
The robust phase x channel is at t0、t1、t2And substituting the frequency difference and the phase difference corresponding to the three moments into an equation (1), an equation (2) and an equation (3), and if at least two equations of the equation (1), the equation (2) and the equation (3) are satisfied, indicating that the healthy phase x meets the closing condition and executing closing.
As shown in fig. 2, the main content of the frequency measurement and phase measurement for the three-phase voltage of the bus is to continuously store the frequency difference and the phase difference value corresponding to the three moments of 0ms, 10ms and 15ms of the three-phase voltage of the bus (the working switch tripping moment is the moment of 0ms and is pushed forward by 10ms and 15 ms). The calculated frequency difference names of the three-phase voltages are shown in the following table 1. Wherein "df, dq" denotes frequency difference and phase difference; "0, 10, 15" represents a time point; "a, b, c" indicates the phase difference. For example, "df _ a _ 10" indicates the frequency difference of the a-phase voltage at the time of 10 ms.
TABLE 1 frequency difference phase difference name calculated from three-phase voltage
| Frequency difference phase difference at 0ms moment | Frequency difference phase difference at 10ms moment | Frequency difference phase difference at 15ms moment | |
| a phase data | df_a_0\dq_a_0 | df_a_10\dq_a_10 | df_a_15\dq_a_15 |
| b phase data | df_b_0\dq_b_0 | df_b_10\dq_b_10 | df_b_15\dq_b_15 |
| c phase data | df_c_0\dq_c_0 | df_c_10\dq_c_10 | df_c_15\dq_c_15 |
The selection of the healthy phase mainly comprises the step of selecting the phase with the largest amplitude from three-phase voltages of the bus Ua, Ub and Uc as the healthy phase, and assuming that the healthy phase is x, wherein x is a phase a, a phase b or a phase c, and the selection logic of the healthy phase is shown in figure 3.
Based on a healthy phase '2 out of 3' quick switching-on decision, the decision is judged according to the following logic:
the frequency difference phase difference corresponding to the robust phase x is respectively denoted as df _ x _0, dq _ x _0, df _ x _10, dq _ x _10, df _ x _15, and dq _ x _15, where x is a phase, b phase, or c phase.
And respectively carrying out basic quick switching-on logic judgment on the 3 time points, and judging that the final quick switching-on logic is satisfied if two of the 3 results satisfy the conditions. The specific judgment logic is shown in fig. 4, that is, the frequency difference data of 0ms, 10ms and 15ms on the healthy full-phase channel is taken, the basic fast switching-on logic judgment is respectively carried out, and if two of the 3 results meet the condition, the final fast switching-on logic is judged to meet the condition.
The method takes the frequency difference of 3 different moments on a channel of the power supply as a data set on the basis of the voltage of a healthy phase, carries out basic rapid switching-on logic judgment on the data of 3 moments on the data set, and finally determines whether the final rapid switching-on logic is met or not by adopting a decision mechanism of '2 from 3' on 3 results. The invention can avoid the influence of the voltage waveform distortion on the rapid switching-on success rate of the rapid switching-off device to the maximum extent during short circuit, and improves the success rate of power supply switching.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (4)
1. A fast switching-on method of a power supply fast switching-off device based on a healthy phase is characterized by comprising the following steps:
step 1, measuring the frequency and the phase of three-phase voltage of a bus: separately store t0、t1、t2Frequency difference and phase difference corresponding to the three moments; wherein, t0For the moment of tripping of the operating switch, t1At the moment when the working switch is tripped, the push-forward operation is carried out2Pushing forward at the tripping moment of the working switch;
step 2, selection of a healthy phase: selecting a phase with the maximum amplitude from three-phase voltages of a bus Ua, Ub and Uc as a healthy phase, wherein the healthy phase is marked as x, and a, b and c represent the phase class of the three phases of the bus;
and 3, a 3-out-of-2 rapid switching-on decision based on a healthy phase: taking a robust phase x channel at t0、t1、t2The frequency difference and the phase difference corresponding to the three moments are respectively recorded as the x-phase voltage at t0Time difference of frequency df _ x _ t0X phase voltage at t0The time difference dq _ x _ t0X phase voltage at t1Time difference of frequency df _ x _ t1X phase voltage at t1The time difference dq _ x _ t1X phase voltage at t2Time difference of frequency df _ x _ t2X phase voltage at t2The time difference dq _ x _ t2Wherein df represents a frequency difference, dq represents a phase difference, and x is a phase or b phase or c phase;
wherein df _ set is a fast switching-on frequency difference constant value, dq _ set is a fast switching-on phase difference constant value, and & represents a logic AND;
the robust phase x channel is at t0、t1、t2And substituting the frequency difference and the phase difference corresponding to the three moments into an equation (1), an equation (2) and an equation (3), and if at least two equations of the equation (1), the equation (2) and the equation (3) are satisfied, indicating that the healthy phase x meets the closing condition and executing closing.
2. The method for quickly switching on the power supply quick switching device based on the healthy phase according to claim 1, characterized in that: the trip time of the working switch is 0 time.
3. The method for quickly switching on the power supply quick switching device based on the healthy phase according to claim 2, characterized in that: the time when the working switch is pushed forward when jumping off is 10 ms.
4. The method for quickly switching on the power supply quick switching device based on the healthy phase according to claim 3, characterized in that: and the second moment when the working switch is pushed forward at the tripping moment is 15 ms.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465560A (en) * | 2008-12-29 | 2009-06-24 | 南京南瑞继保电气有限公司 | Method for rapidly switching power supply |
| CN103595120A (en) * | 2013-11-21 | 2014-02-19 | 长园深瑞继保自动化有限公司 | Multi-incoming-line standby power supply automatic switching-in method |
| CN109742845A (en) * | 2018-12-28 | 2019-05-10 | 江苏金智科技股份有限公司 | A kind of power supply fast switching device rapid closing method based on optimal phase |
| CN111817429A (en) * | 2020-07-23 | 2020-10-23 | 西门子股份公司 | Method and apparatus for power supply switching in power system |
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- 2021-11-22 CN CN202111389315.6A patent/CN114050641A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465560A (en) * | 2008-12-29 | 2009-06-24 | 南京南瑞继保电气有限公司 | Method for rapidly switching power supply |
| CN103595120A (en) * | 2013-11-21 | 2014-02-19 | 长园深瑞继保自动化有限公司 | Multi-incoming-line standby power supply automatic switching-in method |
| CN109742845A (en) * | 2018-12-28 | 2019-05-10 | 江苏金智科技股份有限公司 | A kind of power supply fast switching device rapid closing method based on optimal phase |
| CN111817429A (en) * | 2020-07-23 | 2020-10-23 | 西门子股份公司 | Method and apparatus for power supply switching in power system |
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