A method and system for voltage effective value protection for onboard power distribution systems

Abstract

The application discloses a kind of voltage effective value protection method and system for airborne power distribution system, belong to airborne high-power solid-state power controller technical field.The method of the present application comprises: by the airborne high-power solid-state power controller SSPC installed in airborne power distribution system, the real-time voltage effective value of aircraft AC voltage is determined;When the voltage fault of the airborne power distribution system occurs, the power supply of the airborne power distribution system is switched from aircraft AC power supply to standby power supply by SSPC in a preset period;And the voltage effective value output by the standby power supply is adjusted to be consistent with the real-time voltage effective value.The real-time voltage effective value of aircraft AC voltage is determined by SSPC, which greatly improves the effective value calculation speed and effectively improves the sensitivity of protection action.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of airborne high-power solid-state power controller, and more particularly, to a voltage effective value protection method and system for an airborne power distribution system. BACKGROUND

[0002] With the rapid development of more electric aircraft technology, the types of airborne electrical equipment are more and more miscellaneous, the tasks to be performed are more and more heavy, and the voltage frequency output by the airborne generator is high and has a wide frequency range (360Hz-800Hz). In order to improve the safety and reliability of the airborne electrical equipment, a high-power solid-state power controller (SSPC) is designed for the power distribution system of the aircraft.

[0003] The SSPC is a solid-state device integrating the conversion function of a relay and the protection function of a circuit breaker, and is a switching device matched with an intelligent power distribution system. The SSPC is greatly superior to the traditional relay and contactor in function and performance, has the advantages of no contact, no arc, no noise, fast response, small electromagnetic interference, long service life, high reliability, and easy computer remote control, and meets the requirement of the advanced aircraft electrical system for the simplification of the power distribution device, and is particularly suitable for aviation applications.

[0004] In the embedded control program of the SSPC system, after sampling the data such as the AC voltage and current of the carrier aircraft, the effective value thereof needs to be calculated in real time, so that the effective value protection is performed according to the inverse time curve specified in the national military standard GJB 181B-2012.

[0005] In some special application occasions, part of the sensitive airborne electrical equipment plays a vital role in the safe flight of the aircraft and the successful execution of the task. In order to ensure the safe operation thereof, the SSPC needs to rapidly disconnect the AC power supply of the carrier aircraft and simultaneously switch to the standby power supply within 1.25ms after the occurrence of an under-voltage or power loss fault of the AC power supply of the carrier aircraft, so as to realize uninterrupted power supply to the load. This puts forward higher requirements on the effective value calculation speed of the embedded program in the SSPC.

[0006] Common sinusoidal voltage and current effective value calculation methods include a digital period sampling calculation method and an analog circuit calculation method.

[0007] For the traditional digital period sampling calculation method, the effective value of the sinusoidal voltage or current is obtained by calculating the square root of the average of the squares of the instantaneous values in one period. The specific program implementation method is to calculate the half-wave root mean square value of the collected data, and the specific flow is as shown in Figure 1 The method needs to store the voltage instantaneous values of m sampling points in half a period, calculate the sum of squares of the instantaneous values of the m points, and calculate the average of the sum of squares, and then take the square root of the result. This method stores a large amount of data (m sampling values) and has a long calculation delay (half a period), and the program operation is cumbersome.

[0008] Another method using analog circuit to obtain RMS value, first using analog multiplier to calculate the square value of input signal, second using low pass filter to obtain its average value, and finally taking its square root through operational amplifier with second square in feedback loop, thereby obtaining RMS value, its circuit diagram is shown as Figure 2 This method has slow calculation speed and waveform error. SUMMARY

[0009] In view of the above problems, the present application provides a voltage RMS protection method for airborne power distribution system, comprising:

[0010] The real-time voltage RMS of aircraft AC voltage is determined through the airborne high-power solid-state power controller (SSPC) installed in the airborne power distribution system.

[0011] When the voltage fault occurs in the airborne power distribution system, the power supply of the airborne power distribution system is switched from aircraft AC power supply to standby power supply through the SSPC in a preset period.

[0012] And the voltage RMS output by the standby power supply is adjusted to be consistent with the real-time voltage RMS.

[0013] Optionally, the voltage fault includes under-voltage fault and loss-of-power fault.

[0014] Optionally, the SSPC is installed with an embedded program, and the embedded program includes an RMS calculation subprogram for determining the real-time voltage RMS of aircraft AC voltage.

[0015] Optionally, the calculation process for determining the real-time voltage RMS of aircraft AC voltage is as follows:

[0016] The frequency of the AC sinusoidal voltage signal controlled by the SSPC is detected to determine the signal frequency and sampling frequency in a period, and the sampling number is determined according to the signal frequency and sampling frequency in the period.

[0017] Two arrays test1 and test2 with length N are set, and the N is one fourth of the sampling number.

[0018] The sampling values in the first quarter period in the period are obtained, and the singular values in the sampling values are removed through oversampling, and the sampling values after removing the singular values are put into test1 and test2.

[0019] In the next quarter cycle of the first quarter cycle in the cycle, if the sampling number index in the next quarter cycle is less than N, then empty test1, and store the voltage instantaneous value sampled in the next quarter cycle in test1, and perform square and square root calculation on test1 and test2 not emptied to determine the real-time voltage effective value of the aircraft alternating voltage, if the sampling number index in the next quarter cycle is greater than N, then empty test2, and store the voltage instantaneous value sampled in the next quarter cycle in test2, and perform square and square root calculation on test2 and test1 not emptied to determine the real-time voltage effective value of the aircraft alternating voltage.

[0020] The application further provides a voltage effective value protection system for an airborne power distribution system, comprising:

[0021] A calculation unit controls an airborne high-power solid-state power controller (SSPC) installed in the airborne power distribution system, and determines the real-time voltage effective value of the aircraft alternating voltage.

[0022] A power switching unit controls the SSPC to switch the power source of the airborne power distribution system from the aircraft alternating power source to the standby power source in a preset period when a voltage fault occurs in the airborne power distribution system.

[0023] An effective value protection unit adjusts the voltage effective value output by the standby power source to be consistent with the real-time voltage effective value.

[0024] Optionally, the voltage fault includes an under-voltage fault and a loss-of-power fault.

[0025] Optionally, the SSPC is installed with an embedded program, and the embedded program comprises an effective value calculation subprogram used to determine the real-time voltage effective value of the aircraft alternating voltage.

[0026] Optionally, the calculation process for determining the real-time voltage effective value of the aircraft alternating voltage is as follows:

[0027] The frequency of an alternating sinusoidal voltage signal controlled by the SSPC is detected to determine the signal frequency and the sampling frequency in a cycle, and the sampling number is determined according to the signal frequency and the sampling frequency in the cycle.

[0028] Two arrays test1 and test2 with a length of N are set, and the N is one quarter of the sampling number.

[0029] The sampling value of the first quarter cycle in the cycle is obtained, and the singular value in the sampling value is removed through oversampling, and the sampling value after removing the singular value is put into test1 and test2.

[0030] In the next quarter cycle of the first quarter cycle in the cycle, if the sampling number index in the next quarter cycle is less than N, then empty test1 and store the voltage instantaneous value sampled in the next quarter cycle in test1; carry out square and root calculation on test1 and the not emptied test2 to determine the real-time voltage effective value of the carrier AC voltage; if the sampling number index in the next quarter cycle is greater than N, then empty test2 and store the voltage instantaneous value sampled in the next quarter cycle in test2; carry out square and root calculation on test2 and the not emptied test1 to determine the real-time voltage effective value of the carrier AC voltage.

[0031] The present application determines the real-time voltage effective value of the carrier AC voltage through SSPC, greatly improves the effective value calculation speed, and effectively improves the sensitivity of protection action. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The flow chart for the present application to obtain effective value by digital period sampling calculation method,

[0033] Figure 2 The circuit diagram for the present application to obtain effective value by analog circuit calculation method;

[0034] Figure 3 The flow chart for the present application method;

[0035] Figure 4 The flow chart for the present application method to determine the real-time voltage effective value D of the carrier AC voltage through SSPC;

[0036] Figure 5 The structure diagram for the present application system. DETAILED DESCRIPTION

[0037] Reference will now be made to the drawings to describe the exemplary embodiments of the present application in detail. The present application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art. Like reference numerals refer to like elements throughout the specification. It will be understood that when an element or layer is referred to as being "on" another element or substrate, it can be directly on the element or substrate or intervening layers can also be present. In addition, it will also be understood that when an element is referred to as being "coupled" to another element, it can be directly coupled to the other element or intervening elements can also be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0038] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0039] The application provides a voltage effective value protection method for an airborne power distribution system, which comprises the following steps of Figure 3 as shown in the figure, comprising:

[0040] Determining a real-time voltage effective value of an aircraft AC voltage through an airborne high-power solid-state power controller (SSPC) installed in the airborne power distribution system;

[0041] When a voltage fault occurs in the airborne power distribution system, switching a power supply of the airborne power distribution system from an aircraft AC power supply to a standby power supply through the SSPC in a preset period;

[0042] And adjusting the voltage effective value output by the standby power supply to be consistent with the real-time voltage effective value.

[0043] The SSPC is a solid-state power distribution device integrating the switching function of a set relay and the protection function of a circuit breaker, and is a switching device matched with an intelligent power distribution system, and the SSPC embedded program needs to calculate the real-time effective value of the aircraft AC voltage, and when the system is in an under-voltage or over-voltage or power loss fault, the SSPC needs to disconnect the aircraft AC power supply in half a period (1.25 ms for the aircraft power supply system) and simultaneously switch to the standby power supply, so as to realize uninterrupted power supply to the load.

[0044] The application is applied to the high-frequency wide-band airborne power distribution system, improves the safety and reliability of the aircraft, and meets the performance requirements of the development of the new generation of advanced aircraft.

[0045] The effective value calculation subprogram in the SSPC embedded program comprises the following steps of determining the real-time voltage effective value of the aircraft AC voltage, as shown in the figure, comprising: Figure 4

[0046] The phase-locked loop module in the SSPC detects the frequency of the AC sinusoidal voltage controlled by the SSPC to obtain a signal frequency f signal , and the sampling frequency is f sample , so that the sampling times are calculated; the frequency f signal of the output sinusoidal voltage controlled by the SSPC ranges from 360 Hz to 800 Hz.

[0047] Two arrays test1 and test2 with a length of N are set, through oversampling, singular values are removed, and the sampling values are put into the current empty array.

[0048] Wherein,

[0049] In the current quarter period, N sampling values in the previous quarter period have been stored in the array test2.

[0050] ​If the sampling number index in the current quarter period is less than N, the instantaneous voltage value V i The test1[index] is stored.

[0051] The instantaneous voltage value V i The element test2[index] in the array test2 is calculated by square and square root, and

[0052] When the sampling number index is greater than N, the index is cleared, and the latest sampled voltage instantaneous value is stored in the array test2, and the voltage instantaneous value stored in the corresponding position in the array test1 is calculated by square and square root.

[0053] Through the phase-locked loop module, the SSPC system has the frequency adaptive function, in the high frequency wide frequency airborne application, the sampling value N can be updated in time, and the voltage in the quarter period is sampled.

[0054] The effective value calculation subroutine fully utilizes the periodicity of the sine wave, that is:

[0055]

[0056] The sine voltage waveform is delayed by one quarter of a period, and then sampled and calculated, which can complete the sampling and effective value calculation in one quarter of a period, effectively shortens the calculation delay, greatly improves the sensitivity and reliability of the SSPC system protection.

[0057] By storing the voltage instantaneous value in the array for the first quarter of a period, the voltage instantaneous value in the corresponding position in the two arrays is different by one quarter of a period, which simplifies the operation program and reduces the required storage space.

[0058] The present application only samples and calculates the voltage instantaneous value in 1 / 4 period, the required storage space is small, the calculation amount of the SSPC program is reduced, the voltage effective value calculation time can be shortened to T / 4, the effective value calculation speed is greatly improved, and the sensitivity of the protection action is effectively improved.

[0059] The present application is based on the periodicity of the sine wave, that is:

[0060]

[0061] According to the effective value calculation formula:

[0062]

[0063] It is known that only the voltage instantaneous value in 1 / 4 period is needed to calculate the voltage effective value.

[0064] This invention can achieve frequency adaptation by detecting the voltage frequency through a phase-locked loop module and updating the sampling number in real time, making it suitable for high-frequency and wide-bandwidth airborne operating environments (360-800Hz).

[0065] The present invention also proposes a voltage RMS protection system 200 for airborne power distribution systems, such as... Figure 5 As shown, it includes:

[0066] The calculation unit 201 controls the airborne high-power solid-state power controller (SSPC) installed in the airborne power distribution system to determine the real-time effective value of the AC voltage of the carrier aircraft.

[0067] The power switching unit 202 controls the SSPC to switch the power supply of the airborne power distribution system from the aircraft's AC power supply to the backup power supply within a preset period when a voltage fault occurs in the airborne power distribution system.

[0068] The effective value protection unit 203 adjusts the effective value of the voltage output by the backup power supply to be consistent with the real-time effective value of the voltage.

[0069] The SSPC is equipped with an embedded program, which includes an RMS value calculation subroutine used to determine the real-time RMS value of the carrier's AC voltage.

[0070] The calculation process for determining the real-time effective value of the carrier's AC voltage is as follows:

[0071] Frequency detection is performed on the AC sinusoidal voltage signal controlled by SSPC to determine the signal frequency and sampling frequency within the period, and the number of sampling times is determined based on the signal frequency and sampling frequency within the period.

[0072] Set up two arrays test1 and test2 of length N, where N is one-quarter of the number of samples;

[0073] Obtain the sampled values ​​of the first quarter period within the period, and remove outliers from the sampled values ​​through oversampling. Then, put the sampled values ​​after removing outliers into test1 and test2.

[0074] In the next quarter cycle of the first quarter cycle in the cycle, if the sampling number index in the next quarter cycle is less than N, then empty test1 and store the voltage instantaneous value sampled in the next quarter cycle in test1; perform square and then square root calculation on test1 and test2 not emptied to determine the real-time voltage effective value of the carrier AC voltage; if the sampling number index in the next quarter cycle is greater than N, then empty test2 and store the voltage instantaneous value sampled in the next quarter cycle in test2; perform square and then square root calculation on test2 and test1 not emptied to determine the real-time voltage effective value of the carrier AC voltage.

[0075] The present application determines the real-time voltage effective value of the carrier AC voltage through SSPC, greatly improves the effective value calculation speed, and effectively improves the sensitivity of protection action.

[0076] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt a computer program product in the form of being implemented on one or more computer usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer usable program codes. The solutions in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and direct interpretation script language JavaScript, etc.

[0077] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system), and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocks Figure 1 The means for performing the functions specified in one block or multiple blocks.

[0078] These computer program instructions can also be stored in a computer readable memory capable of guiding the computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer readable memory produce a product including instruction means, which implements the functions specified in the flowcharts and / or block diagrams. Figure 1one or more processes and / or blocks Figure 1 the function specified in the one or more blocks or blocks.

[0079] These computer program instructions can also be loaded into computer or other programmable data processing devices to cause a series of operational steps to be performed on the computer or other programmable devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable devices provide steps for implementing the process Figure 1 one or more processes and / or blocks Figure 1 the function specified in the one or more blocks or blocks.

[0080] While the preferred embodiments of the application have been described, additional variations and modifications can be made to the preferred embodiments by those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to cover all such additional variations and modifications as fall within the scope of the application. What is claimed is:

[0081] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A method for protecting the effective voltage value of an airborne power distribution system, characterized in that, The method includes: The real-time effective value of the AC voltage of the carrier aircraft is determined by the airborne high-power solid-state power controller (SSPC) installed in the airborne power distribution system. When a voltage fault occurs in the airborne power distribution system, the SSPC switches the power supply of the airborne power distribution system from the aircraft's AC power supply to the backup power supply within a preset period. And adjust the effective value of the voltage output by the backup power supply to be consistent with the effective value of the real-time voltage; The calculation process for determining the real-time effective value of the carrier's AC voltage is as follows: Frequency detection is performed on the AC sinusoidal voltage signal controlled by SSPC to determine the signal frequency and sampling frequency within the period, and the number of sampling times is determined based on the signal frequency and sampling frequency within the period. Set up two arrays test1 and test2 of length N, where N is one-quarter of the number of samples; Obtain the sampled values ​​of the first quarter period within the period, and remove outliers from the sampled values ​​through oversampling. Then, put the sampled values ​​after removing outliers into test1 and test2. In the next quarter-cycle of the first quarter-cycle within the cycle, if the sampling count index in the next quarter-cycle is less than N, then test1 is cleared, and the instantaneous voltage value sampled in the next quarter-cycle is stored in test1; the sum of squares and square root calculations are performed on test1 and the not-cleared test2 to determine the real-time effective value of the carrier's AC voltage; if the sampling count index in the next quarter-cycle is greater than N, then test2 is cleared, and the instantaneous voltage value sampled in the next quarter-cycle is stored in test2; the sum of squares and square root calculations are performed on test2 and the not-cleared test1 to determine the real-time effective value of the carrier's AC voltage.

2. The method according to claim 1, characterized in that, The voltage faults include: undervoltage and overvoltage faults and power failure faults.

3. The method according to claim 1, characterized in that, The SSPC is equipped with an embedded program, which includes an RMS value calculation subroutine for determining the real-time RMS value of the carrier's AC voltage.

4. A voltage RMS protection system for airborne power distribution systems, characterized in that, The system includes: The computing unit controls the airborne high-power solid-state power controller (SSPC) installed in the airborne power distribution system to determine the real-time effective value of the aircraft's AC voltage. The power switching unit controls the SSPC to switch the power supply of the airborne power distribution system from the aircraft's AC power supply to the backup power supply within a preset period when a voltage fault occurs in the airborne power distribution system. The effective value protection unit adjusts the effective value of the voltage output by the backup power supply to be consistent with the real-time effective value of the voltage. The calculation process for determining the real-time effective value of the carrier's AC voltage is as follows: Frequency detection is performed on the AC sinusoidal voltage signal controlled by SSPC to determine the signal frequency and sampling frequency within the period, and the number of sampling times is determined based on the signal frequency and sampling frequency within the period. Set up two arrays test1 and test2 of length N, where N is one-quarter of the number of samples; Obtain the sampled values ​​of the first quarter period within the period, and remove outliers from the sampled values ​​through oversampling. Then, put the sampled values ​​after removing outliers into test1 and test2. In the next quarter-cycle of the first quarter-cycle within the cycle, if the sampling count index in the next quarter-cycle is less than N, then test1 is cleared, and the instantaneous voltage value sampled in the next quarter-cycle is stored in test1; the sum of squares and square root calculations are performed on test1 and the not-cleared test2 to determine the real-time effective value of the carrier's AC voltage; if the sampling count index in the next quarter-cycle is greater than N, then test2 is cleared, and the instantaneous voltage value sampled in the next quarter-cycle is stored in test2; the sum of squares and square root calculations are performed on test2 and the not-cleared test1 to determine the real-time effective value of the carrier's AC voltage.

5. The system according to claim 4, characterized in that, The voltage faults include: undervoltage and overvoltage faults and power failure faults.

6. The system according to claim 4, characterized in that, The SSPC is equipped with an embedded program, which includes an RMS value calculation subroutine for determining the real-time RMS value of the carrier's AC voltage.

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