CN112398107B - Voltage sampling circuit in overvoltage suppression device of three-phase variable-frequency alternating-current power generation system - Google Patents
Voltage sampling circuit in overvoltage suppression device of three-phase variable-frequency alternating-current power generation system Download PDFInfo
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- CN112398107B CN112398107B CN202011271304.3A CN202011271304A CN112398107B CN 112398107 B CN112398107 B CN 112398107B CN 202011271304 A CN202011271304 A CN 202011271304A CN 112398107 B CN112398107 B CN 112398107B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
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Abstract
The invention provides a voltage sampling circuit in an overvoltage suppression device of a three-phase variable-frequency alternating-current power generation system, which comprises a voltage dividing circuit, an effective value calculating circuit and a subtracting circuit, wherein the voltage dividing circuit is connected with the voltage dividing circuit; the voltage dividing circuit divides the voltage of the output end of the generator to 0V-V 1 V range, where V 1 Taking a larger value in the range of the allowable working voltage of the overvoltage suppression device so as to meet the data resolution requirement of a DSP processing circuit in the overvoltage suppression device; the voltage signal POR_RMS output by the effective value calculating circuit and the introduced voltage are v 2 V voltage signal M is input into subtracting circuit, in subtracting circuit voltage signal POR_RMS minus voltage signal M is input into DSP processing circuit, wherein voltage V 2 Satisfy v 2 <v 1 * K/Q and v 1 ‑v 2 T is not more than. According to the invention, for the voltage information in the effective range of the voltage of the output end of the variable-frequency alternating-current generator in the overvoltage suppression device, the data identification degree of the voltage of the generator end of the transient overvoltage suppression device can be effectively improved by increasing the voltage division coefficient of the output voltage of the generator end and combining with reasonable control logic, so that the stable control of the system is realized.
Description
Technical Field
The invention belongs to the field of aviation variable frequency alternating current power generation systems, and relates to a voltage sampling technology of a transient overvoltage dynamic suppression device of a three-phase variable frequency alternating current power generation system.
Background
When the high-power variable-frequency alternating-current power generation system is subjected to high-capacity load switching or faults to generate overvoltage, the overvoltage suppression device of the three-phase variable-frequency alternating-current power generation system is matched with the generator controller, so that the power supply system error protection caused by overvoltage can be effectively prevented, and the damage of high voltage to rear-stage electric equipment is avoided. Such an overvoltage suppression device for a three-phase variable frequency ac power generation system is disclosed in chinese patent (ZL 2017109810898).
Disclosure of Invention
Technical problem to be solved
When the inventor uses the overvoltage suppression device of the three-phase frequency conversion alternating current power generation system disclosed by the prior art on the related model, the system is found to be unstable in the control process, and misjudgment conditions can occur, especially when the voltage of the generator terminal changes in a program period, the misjudgment conditions are more. The inventor carefully analyzes the reasons and then discovers that the prior art divides the voltage of the output end of the generator to the range of 0V to 3V through a voltage dividing resistor so as to meet the input voltage requirement of the DSP processing circuit, and then the voltage of 0V to 3V directly enters the DSP processing circuit for sampling and then realizes algorithm control; however, the voltage division coefficient generated by directly dividing the voltage of the output end of the generator to 0V to 3V is too small, so that the resolution of data obtained by sampling through a DSP processing circuit is very low, the voltage change condition of the end of the generator is difficult to identify, misjudgment is easy to generate during control, and the system is unstable.
Technical proposal
In order to solve the technical problems, the invention provides a voltage sampling circuit in an overvoltage suppression device of a three-phase variable-frequency alternating-current power generation system.
When the high-power variable-frequency alternating-current power generation system is subjected to high-capacity load switching or faults to generate overvoltage, the suppression load in the transient overvoltage suppression device is input to effectively absorb energy generated by residual excitation of the main generator, so that an overvoltage critical point and a voltage value above the critical point are effective information for realizing overvoltage suppression control. Therefore, the main idea of the invention is to expand the voltage dividing voltage range, namely, the voltage of the output end of the generator is divided to 0V-V 1 V range, where V 1 In order to allow a large value to be taken in the working voltage range in the overvoltage suppression device, the voltage division coefficient is increased, and the data resolution is improved; then a voltage v is introduced 2 V signal M, which is subtracted from the voltage signal POR_RMS calculated by voltage division and effective value of the generator output terminal voltage,to obtain valid voltage information for the high voltage range segment and discard invalid control voltage information for the low voltage range segment.
In particular, after subtracting the signal M from the signal por_rms, the effective voltage information of the high voltage range can be covered, and no erroneous judgment can be made, so that v can be obtained according to the overvoltage threshold value K (overvoltage critical point) set by the high-power variable-frequency ac power generation system and the maximum voltage Q generated by the generator 1 And v 2 Should satisfy v 2 <v 1 * K/Q; in addition, since the DSP processing circuit is solidified and cannot be changed, the signal voltage input into the DSP processing circuit cannot be greater than 3V, so V 1 And v 2 Also needs to satisfy v 1 -v 2 ≤3。
In addition, in order to ensure the reliability of judgment, a comparison circuit is also provided, the signal POR_RMS is compared with the signal M, and the comparison result is sent to a logic processing unit for processing, the sampling data of the DSP processing circuit is valid only when the voltage value of the signal POR_RMS is larger than the voltage value of the signal M, otherwise, the sampling result of the DSP processing circuit is not processed.
The technical scheme of the invention is as follows:
the voltage sampling circuit in the overvoltage suppression device of the three-phase variable-frequency alternating-current power generation system comprises a voltage dividing circuit, an effective value calculating circuit and a subtracting circuit;
the input of the voltage dividing circuit is the voltage of the output end of the main generator of the three-phase variable frequency alternating current power generation system, the output is a three-phase low-voltage alternating current signal after voltage division, and the three-phase low-voltage alternating current signal passes through the effective value calculating circuit to obtain the effective value of the three-phase low-voltage alternating current signal;
the voltage dividing circuit divides the voltage of the output end of the generator to 0V-V 1 V range, where V 1 Taking a larger value in the range of the allowable working voltage of the overvoltage suppression device so as to meet the data resolution requirement of a DSP processing circuit in the overvoltage suppression device;
the voltage signal POR_RMS output by the effective value calculating circuit and the introduced voltage are v 2 The voltage signal M of V is input to a subtracting circuit, in which,the voltage signal POR_RMS minus the voltage signal M is input into the DSP processing circuit, wherein the voltage v 2 Satisfy v 2 <v 1 * K/Q and v 1 -v 2 T, K is an overvoltage threshold value in the three-phase variable frequency alternating current power generation system, Q is the maximum voltage generated by a generator in the three-phase variable frequency alternating current power generation system, and T is the maximum voltage allowed to be input by the DSP processing circuit.
Further, the voltage sampling circuit further comprises a comparison circuit and a logic control unit; the voltage signal POR_RMS and the voltage signal M output by the effective value calculating circuit are input into the comparing circuit, the signal POR_RMS is compared with the signal M, the comparison result is sent to the logic processing unit for processing, when the voltage value of the signal POR_RMS is larger than that of the signal M, the DSP processing circuit carries out subsequent processing on the sampled data, otherwise, the DSP processing circuit does not carry out subsequent processing on the sampled result.
Advantageous effects
According to the invention, for the voltage information in the effective range of the voltage of the output end of the variable-frequency alternating-current generator in the overvoltage suppression device, the data identification degree of the voltage of the generator end of the transient overvoltage suppression device can be effectively improved by increasing the voltage division coefficient of the output voltage of the generator end and combining with reasonable control logic, so that the stability control of the system is realized.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic block diagram of a voltage sampling circuit of an overvoltage suppression device of a three-phase variable frequency alternating current power generation system.
Detailed Description
The embodiment aims at an overvoltage suppression device of a three-phase variable-frequency alternating-current power generation system disclosed in China patent (ZL 2017109810898), and correspondingly improves signal transmission from the output end voltage of a generator to a DSP processing circuit.
The voltage sampling circuit in this embodiment is composed of a voltage dividing circuit, an effective value calculating circuit, a subtracting circuit, a comparing circuit, and a logic control unit.
The input of the voltage dividing circuit is the voltage of the output end of the main generator of the three-phase variable frequency alternating current power generation system, the output is a three-phase low-voltage alternating current signal after voltage division, and the three-phase low-voltage alternating current signal passes through the effective value calculating circuit to obtain the effective value of the three-phase low-voltage alternating current signal. In chinese patent (ZL 2017109810898), since the effective value signal is directly input into the DSP processing circuit, in order to meet the input voltage requirement of the DSP processing circuit, the voltage dividing circuit divides the voltage of the output end of the main generator to a range of 0 to 3V, that is, when the voltage of the output end of the main generator is the maximum voltage, the voltage dividing circuit outputs a signal with an effective value of 3V, but such signal has low data resolution, so that it is difficult to identify the voltage change condition of the generator end after entering the DSP for sampling.
For this reason, in this embodiment, the voltage dividing circuit is adjusted to divide the voltage of the generator output terminal to 0V-V 1 V range, where V 1 In order to take a larger value in the allowed working voltage range in the overvoltage suppression device, 6V is taken in the embodiment, namely the voltage of the output end of the generator is divided to be in the range of 0V-6V, so that the data resolution is improved.
Next, based on the overvoltage critical point and the voltage value above the critical point, which is the effective information for realizing the overvoltage suppression control, the subtracting circuit, the comparing circuit and the logic control unit are set and a new voltage v is introduced 2 V voltage signal M.
In the subtracting circuit, the voltage signal POR_RMS output by the effective value calculating circuit and the voltage signal M are subtracted and input into the DSP processing circuit.
The voltage signal POR_RMS and the voltage signal M output by the effective value calculating circuit are also input into the comparing circuit, the signal POR_RMS is compared with the signal M, and the comparison result is sent to the logic processing unit for processing, and the DSP processing circuit performs subsequent processing on the sampled data only when the voltage value of the signal POR_RMS is larger than the voltage value of the signal M, otherwise, the DSP processing circuit does not perform subsequent processing on the sampled result.
As described above, after subtracting the signal M from the signal por_rms, the effective voltage information of the high voltage range can be covered, and no missed judgment can be made, so that v can be obtained according to the overvoltage threshold K (overvoltage critical point) set by the high-power variable-frequency ac power generation system and the maximum voltage Q generated by the generator 1 And v 2 Should satisfy v 2 <v 1 * K/Q. In the embodiment, the normal working voltage of the high-power variable-frequency alternating-current power generation system is 115V, the set overvoltage threshold K is 125V, the maximum voltage Q generated by the generator is 150V after test, and when V 1 When taking 6V, V 2 Less than 5V.
In addition, since the DSP processing circuit in this embodiment is already product cured and cannot be changed, the signal voltage input to the DSP processing circuit cannot be greater than 3V, so V 1 And v 2 Also needs to satisfy v 1 -v 2 Not more than 3, when v 1 When taking 6V, V 2 And cannot be less than 3V. Taken together, v in this embodiment 2 3V was taken.
As shown in fig. 1, the voltage of the output end of the main generator passes through a voltage dividing circuit and an effective value calculating circuit to obtain a direct current signal POR_RMS with the range of 0V-6V; the direct current signal POR_RMS is subtracted from the introduced 3V voltage signal through a subtracting circuit [5], meanwhile, the POR_RMS signal is compared with the introduced 3V voltage signal through a comparison voltage stabilizing circuit [4], the comparison result is sent to a logic processing unit [6], if the POR_RMS is greater than 3V, DSP sampling [7] is enabled to perform data processing [8], and data input [9] is provided for an overvoltage suppression control algorithm of the three-phase variable frequency alternating current power generation system; otherwise, the data sampled by the DSP is invalidated [7], and the subsequent data processing is not performed [8].
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention.
Claims (1)
1. The utility model provides a voltage sampling circuit in overvoltage suppression device of three-phase frequency conversion alternating current power generation system which characterized in that: the device comprises a voltage dividing circuit, an effective value calculating circuit and a subtracting circuit;
the input of the voltage dividing circuit is the voltage of the output end of the main generator of the three-phase variable frequency alternating current power generation system, the output is a three-phase low-voltage alternating current signal after voltage division, and the three-phase low-voltage alternating current signal passes through the effective value calculating circuit to obtain the effective value of the three-phase low-voltage alternating current signal;
the voltage dividing circuit divides the voltage of the output end of the generator to 0V-0Vv 1 V range, whereinv 1 The value is 6, so that the data resolution requirement of a DSP processing circuit in the overvoltage suppression device is met;
the voltage signal POR_RMS output by the effective value calculating circuit and the introduced voltage arev 2 V voltage signal M is input into subtracting circuit, in subtracting circuit voltage signal POR_RMS minus voltage signal M is input into DSP processing circuit, wherein voltage is input into DSP processing circuitv 2 Satisfy the following requirementsv 2 < v 1 * K/Qv 1 - v 2 T, K is an overvoltage threshold value in the three-phase variable-frequency alternating-current power generation system, Q is the maximum voltage generated by a generator in the three-phase variable-frequency alternating-current power generation system, and T is the maximum voltage allowed to be input by the DSP processing circuit;v 2 the value is 3;
the voltage of the output end of the main generator passes through a voltage dividing circuit and an effective value calculating circuit to obtain a direct current signal POR_RMS with the range of 0V-6V; the direct current signal POR_RMS is subjected to subtraction operation with an introduced 3V voltage signal through a subtraction circuit, meanwhile, the POR_RMS signal is compared with the introduced 3V voltage signal through a comparison voltage stabilizing circuit, the comparison result is sent to a logic processing unit, and if the POR_RMS is greater than 3V, DSP sampling is enabled to perform data processing, so that data input is provided for an overvoltage suppression control algorithm of the three-phase variable frequency alternating current power generation system; otherwise, the data obtained by sampling the DSP is invalid, and the subsequent data processing is not performed.
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