An end voltage sampling control circuit for a thermionic power generation system

Abstract

The application discloses an end voltage sampling control circuit of a thermionic power generation system, and relates to the technical field of thermionic power generation systems, in particular to an end voltage sampling control circuit of a thermionic power generation system. The thermionic power generation system is connected with a load through a power electronic converter, and comprises a reference voltage source, a voltage compensation module, an addition module and a voltage sampling module. The reference voltage source is used for outputting a preset reference voltage. The voltage compensation module is used for generating a voltage correction amount according to a current output by the thermionic power generation system. The addition module is used for summing the preset reference voltage and the voltage correction amount to obtain a corrected reference voltage. The voltage sampling module is used for collecting an initial voltage at an input end of the power electronic converter. A control adjustment module is used for adjusting the voltage at the input end of the power electronic converter according to the initial voltage at the input end of the power electronic converter and the corrected reference voltage when the required power of the load changes. According to the application, the corrected reference voltage and the voltage at the input end of the power electronic converter, i.e. the voltage at the far end, are matched, so that the voltage at the output end of the thermionic power generation system, i.e. the voltage at the near end, can be stably controlled, and signal interference caused by long-distance sampling can be effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage sampling, and in particular to a terminal voltage sampling control circuit of a thermionic power generation system. Background Art

[0002] Thermionic power generation systems are power systems based on static thermoelectric conversion, primarily utilizing the decay energy of radioactive isotopes and nuclear fission as heat sources. They represent a form of clean energy with great potential for development. During operation, thermionic power generation systems often aim to maximize the power output and efficiency of the converted energy. The most direct and simple control method is constant voltage control, typically implemented through a control and regulation circuit.

[0003] Because thermionic power generation systems feature low-voltage, high-current outputs, with output currents reaching hundreds of amperes, the voltage drop caused by cables during long-distance power transmission can negatively impact voltage control accuracy and the thermionic power generation system's transmission efficiency. Control and regulation circuits must address this cable voltage drop to maintain a constant near-end voltage at the thermionic power generation system output. Currently, two main voltage sampling methods exist in control and regulation circuits. One employs near-end voltage sampling, directly sampling the voltage at the thermionic power generation system output. However, this near-end voltage sampling method has limitations, including low reliability and stability, and the sampling signal is highly susceptible to interference over long distances. The other approach involves directly sampling the far-end voltage at the source output, directly sampling the voltage near the input of the power electronic converter. While this far-end voltage sampling method mitigates interference caused by long-distance sampling to a certain extent, it can cause dynamic variations in the near-end voltage at the thermionic power generation system, causing it to deviate from the maximum power operating point voltage and reducing system conversion efficiency. Summary of the Invention

[0004] The present invention aims to provide a terminal voltage sampling control circuit for a thermionic power generation system. By coordinating a correction reference voltage with the voltage directly sampled by a voltage sampling module near the input terminal of a power electronic converter, stable control of the near-end voltage of the thermionic power generation system can be achieved. This effectively avoids signal interference caused by long-distance sampling and ensures that the system's energy is output at maximum power and efficiency.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A terminal voltage sampling control circuit for a thermionic power generation system, wherein the thermionic power generation system is connected to the input terminal of a power electronic converter, the output terminal of the power electronic converter is connected to a load, and the power electronic converter performs power conversion on the voltage output by the thermionic power generation system and supplies the voltage to the load; the terminal voltage sampling control circuit comprises:

[0007] A reference voltage source, used for outputting a preset reference voltage;

[0008] a voltage compensation module, connected to the thermionic power generation system, and configured to generate a voltage correction value according to the current output by the thermionic power generation system;

[0009] an adding module, connected to the reference voltage source and the voltage compensation module, and configured to sum the preset reference voltage and the voltage correction amount to obtain a correction reference voltage;

[0010] a voltage sampling module, connected to the input terminal of the power electronic converter, and configured to collect the initial voltage at the input terminal of the power electronic converter; and

[0011] A control and regulation module, whose input end is connected to the addition module and the voltage sampling module, and whose output end is connected to the control end of the power electronic converter module, is used to adjust the voltage at the input end of the power electronic converter module according to the initial voltage at the input end of the power electronic converter and the correction reference voltage when the load power demand changes, so as to achieve dynamic fine-tuning of the far-end voltage at the input end of the power electronic converter and real-time stable control of the near-end voltage at the output end of the thermionic power generation system.

[0012] Optionally, the output end of the thermionic power generation system includes a positive output end and a negative output end; the input end of the power electronic converter includes a positive input end and a negative input end; and the voltage compensation module includes:

[0013] A positive terminal sampling resistor R1, whose input end is connected to the positive output end of the thermionic power generation system, and whose output end is connected to the positive input end of the power electronic converter;

[0014] A positive terminal voltage correction module, having a first input end connected to the input end of the positive terminal sampling resistor R1, a second input end connected to the output end of the positive terminal sampling resistor R1, and an output end connected to the adding module, is configured to generate a positive terminal voltage correction value based on the current output by the thermionic power generation system and the resistance value of the positive terminal sampling resistor R1.

[0015] Optionally, the voltage compensation module further includes:

[0016] A negative terminal sampling resistor R2, whose input end is connected to the negative output end of the thermionic power generation system, and whose output end is connected to the negative input end of the power electronic converter;

[0017] A negative terminal voltage correction module, having a first input end connected to the input end of the negative terminal sampling resistor R2, a second input end connected to the output end of the negative terminal sampling resistor R2, and an output end connected to the adding module, is configured to generate a negative terminal voltage correction amount based on the current output by the thermionic power generation system and the resistance value of the negative terminal sampling resistor R2.

[0018] Optionally, the addition module includes:

[0019] a first adder, a first input end of which is connected to the output end of the positive terminal voltage correction module, and a second input end of which is connected to the output end of the negative terminal voltage correction module, for summing the positive terminal voltage correction amount and the negative terminal voltage correction amount to obtain the positive and negative terminal voltage correction amounts;

[0020] A second adder, whose first input end is connected to the output end of the first adder, whose second input end is connected to the reference voltage source, and whose output end is connected to the input end of the control and regulation module, is used to sum the positive and negative terminal voltage correction amount and the preset reference voltage to obtain the correction reference voltage.

[0021] Optionally, the control and regulation module includes a control and regulation circuit; and the correction reference voltage is a reference voltage of the control and regulation circuit.

[0022] Compared with the prior art, the present invention has at least one of the following advantages:

[0023] The present invention provides a terminal voltage sampling control circuit for a thermionic power generation system. The thermionic power generation system transmits electrical energy to a load via a power electronic converter. A voltage compensation module generates a voltage correction value based on the current output by the thermionic power generation system, and an addition module sums a preset reference voltage and the voltage correction value to obtain a correction reference voltage. When the load power demand changes, a control and regulation module adjusts the voltage at the input end of the power electronic converter module based on the correction reference voltage and the initial voltage at the input end of the power electronic converter acquired by the voltage acquisition module, thereby achieving dynamic fine-tuning of the far-end voltage at the input end of the power electronic converter. This ensures real-time and stable control of the near-end voltage at the output end of the thermionic power generation system, thereby enabling the thermionic power generation system to output energy at maximum power and efficiency.

[0024] In the present invention, the positive-end sampling resistor R1 can provide the positive-end voltage correction module with signal information (e.g., current signal) of the positive-end transmission cable output by the thermionic power generation system, so that the positive-end voltage correction module can generate a positive-end voltage correction amount to compensate for the voltage difference between the positive-end output of the thermionic power generation system and the positive-end input of the power electronic converter; the negative-end sampling resistor R2 can provide the negative-end voltage correction module with signal information (e.g., current signal) of the negative-end transmission cable output by the thermionic power generation system, so that the negative-end voltage correction module can generate a negative-end voltage correction amount to compensate for the voltage difference between the negative-end output of the thermionic power generation system and the negative-end input of the power electronic converter.

[0025] The addition module in the present invention can sum the positive terminal voltage correction amount, the negative terminal voltage correction amount and the preset reference voltage to obtain a correction reference voltage, that is, generate a new reference voltage; by coordinating the correction reference voltage with the voltage sampling module directly sampling the voltage near the input end of the power electronic converter, that is, the far end of the thermionic power generation system, dynamic fine-tuning of the voltage at the input end of the power electronic converter when the load demand power changes can be achieved, which can ensure the stability of the voltage at the output end of the thermionic power generation system, that is, the near end, while achieving maximum power transmission energy, thereby achieving stable control of the output end voltage of the thermionic power generation system.

[0026] The present invention can improve the accuracy of voltage control at the output end, i.e., the proximal end, of the thermionic power generation system, and effectively avoid signal interference caused by long-distance sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a schematic structural diagram of a terminal voltage sampling control circuit of a thermionic power generation system provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following is a further detailed description of the terminal voltage sampling control circuit of a thermionic power generation system proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will become clearer. It should be noted that the drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention, so they have no technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0029] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0030] Combined with attachment Figure 1 As shown, this embodiment provides a terminal voltage sampling control circuit for a thermionic power generation system, wherein the thermionic power generation system is connected to the input terminal of a power electronic converter, and the output terminal of the power electronic converter is connected to a load; wherein the thermionic power generation system is used to output electrical energy having voltage and current, and the thermionic power generation system transmits the electrical energy to the load through the power electronic converter; the power electronic converter can convert the voltage output by the thermionic power generation system into power and then supply it to the load, so that the load can operate normally. The terminal voltage sampling control circuit includes: a reference voltage source for outputting a preset reference voltage; a voltage compensation module connected to the thermionic power generation system for generating a voltage correction value based on the current output by the thermionic power generation system; an addition module connected to the reference voltage source and the voltage compensation module for summing the preset reference voltage and the voltage correction value to obtain a corrected reference voltage; a voltage sampling module connected to the input terminal of the power electronic converter for collecting the initial voltage at the input terminal of the power electronic converter, i.e., the far end; and a control and regulation module, whose input terminal is connected to the addition module and the voltage compensation module. The sampling module is connected to the control terminal of the power electronic converter module, and its output terminal is connected to the control terminal of the power electronic converter module. When the load power demand changes, the voltage at the input terminal of the power electronic converter module is adjusted according to the initial voltage at the input terminal of the power electronic converter and the correction reference voltage, thereby achieving dynamic fine-tuning of the voltage at the input terminal of the power electronic converter, i.e., the voltage at the far end of the thermionic power generation system. This effectively avoids signal interference caused by long-distance sampling while ensuring real-time stable control of the voltage at the output terminal of the thermionic power generation system, i.e., the near-end voltage, thereby enabling the energy of the thermionic power generation system to be output at maximum power and efficiency. Optionally, the power electronic converter is a rectifier, a chopper, an inverter, an AC controller, a cycloconverter, etc.

[0031] Please continue to refer to Figure 1The output end of the thermionic power generation system includes a positive output end and a negative output end; the input end of the power electronic converter includes a positive input end and a negative input end; the voltage compensation module includes: a positive terminal sampling resistor R1, whose input end is connected to the positive output end of the thermionic power generation system, and whose output end is connected to the positive input end of the power electronic converter; a positive terminal voltage correction module, whose first input end is connected to the input end of the positive terminal sampling resistor R1, whose second input end is connected to the output end of the positive terminal sampling resistor R1, and whose output end is connected to the adding module, for generating a positive terminal voltage correction amount according to the current output by the thermionic power generation system and the resistance value of the positive terminal sampling resistor R1.

[0032] It is understandable that the voltage compensation module further includes: a negative-end sampling resistor R2, whose input end is connected to the negative output end of the thermionic power generation system, and whose output end is connected to the negative input end of the power electronic converter; a negative-end voltage correction module, whose first input end is connected to the input end of the negative-end sampling resistor R2, whose second input end is connected to the output end of the negative-end sampling resistor R2, and whose output end is connected to the adding module, for generating a negative-end voltage correction amount according to the current output by the thermionic power generation system and the resistance value of the negative-end sampling resistor R2.

[0033] Specifically, in this embodiment, the input end of the positive-end sampling resistor R1 can be connected to the positive output end of the thermionic power generation system and the first input end of the positive-end voltage correction module via a cable, and the output end of the positive-end sampling resistor R1 can be connected to the positive input end of the power electronic converter and the second input end of the positive-end voltage correction module via a cable. The positive-end sampling resistor R1 can provide the positive-end voltage correction module with signal information (e.g., a current signal) from the positive output transmission cable of the thermionic power generation system, enabling the positive-end voltage correction module to generate the positive-end voltage correction value, where the positive-end voltage correction value is the product of the current on the positive output transmission cable of the thermionic power generation system and the resistance value of the positive-end sampling resistor R1. More specifically, the positive terminal voltage correction amount can be used to compensate for the voltage difference between the positive output terminal of the thermionic power generation system and the positive input terminal of the power electronic converter. This allows for subsequent dynamic fine-tuning of the voltage at the input terminal of the power electronic converter, i.e., the far end of the thermionic power generation system, by obtaining the correction reference voltage based on the positive terminal voltage correction amount. This avoids interference caused by the voltage difference, thereby achieving stable control of the voltage at the output terminal of the thermionic power generation system, i.e., the near end. However, the present invention is not limited to this.

[0034] Similarly, the input end of the negative-end sampling resistor R2 can be connected to the negative output terminal of the thermionic power generation system and the first input end of the negative-end voltage correction module via a cable, and the output end of the negative-end sampling resistor R2 can be connected to the negative input terminal of the power electronic converter and the second input end of the negative-end voltage correction module via a cable. The negative-end sampling resistor R2 can provide the negative-end voltage correction module with signal information (e.g., a current signal) from the transmission cable at the negative output terminal of the thermionic power generation system, enabling the negative-end voltage correction module to generate a negative-end voltage correction value, where the negative-end voltage correction value is the product of the current on the transmission cable at the negative output terminal of the thermionic power generation system and the resistance value of the negative-end sampling resistor R2. More specifically, the negative terminal voltage correction amount can be used to compensate for the voltage difference between the negative output terminal of the thermionic power generation system and the negative input terminal of the power electronic converter. This allows for subsequent dynamic fine-tuning of the voltage at the input terminal of the power electronic converter, i.e., the far end of the thermionic power generation system, by obtaining the correction reference voltage based on the negative terminal voltage correction amount. This avoids interference caused by the voltage difference, thereby achieving stable control of the voltage at the output terminal of the thermionic power generation system, i.e., the near end. However, the present invention is not limited to this.

[0035] Please continue to refer to Figure 1 The addition module includes: a first adder, whose first input end is connected to the output end of the positive terminal voltage correction module, and whose second input end is connected to the output end of the negative terminal voltage correction module, and is used to sum the positive terminal voltage correction amount and the negative terminal voltage correction amount to obtain the positive and negative terminal voltage correction amount; a second adder, whose first input end is connected to the output end of the first adder, whose second input end is connected to the reference voltage source, and whose output end is connected to the input end of the control and adjustment module, and is used to sum the positive and negative terminal voltage correction amount and the preset reference voltage to obtain the correction reference voltage.

[0036] Specifically, in this embodiment, the input end of the control and regulation module includes a reference voltage input end and a sampling voltage input end, and the output end of the second adder can be connected to the reference voltage input end of the control and regulation module, the output end of the voltage sampling module can be connected to the sampling voltage input end of the control and regulation module, and the output end of the control and regulation module is connected to the control end of the power electronic converter. More specifically, the control and regulation module is internally provided with a control and regulation circuit; the correction reference voltage is the reference voltage of the control and regulation circuit, and the initial voltage at the input end of the power electronic converter is the sampling voltage of the control and regulation circuit; in the control and regulation circuit, an error voltage can be obtained by comparing the correction reference voltage with the initial voltage at the input end of the power electronic converter; based on the error voltage, the voltage at the input end of the power electronic converter can be dynamically fine-tuned through the control end of the power electronic converter, so that when the load power demand changes, the voltage at the input end of the power electronic converter, i.e., the far-end voltage of the thermionic power generation system, is stable, thereby achieving stable control of the near-end voltage of the thermionic power generation system, and further achieving maximum power transmission energy while ensuring the near-end voltage stability of the thermionic power generation system. It is understandable that the control and regulation circuit is a commonly used or classic voltage control and regulation circuit in the prior art, such as a switching voltage regulator circuit, but the present invention is not limited thereto.

[0037] In summary, this embodiment provides a terminal voltage sampling control circuit for a thermionic power generation system. The thermionic power generation system transmits electrical energy to a load via a power electronic converter. The voltage compensation module can generate a voltage correction value based on the current output by the thermionic power generation system, and the addition module can sum a preset reference voltage and the voltage correction value to obtain a correction reference voltage. When the load power demand changes, the control and regulation module can adjust the voltage at the input end of the power electronic converter module based on the correction reference voltage and the initial voltage at the input end of the power electronic converter collected by the voltage collection module, thereby achieving dynamic fine-tuning of the voltage at the input end of the power electronic converter, i.e., the far-end voltage of the thermionic power generation system, thereby ensuring real-time stable control of the voltage at the output end of the thermionic power generation system, i.e., the near-end voltage, and thereby enabling the thermionic power generation system to output energy at maximum power and efficiency. In this embodiment, the positive-end sampling resistor R1 can provide the positive-end voltage correction module with signal information (e.g., a current signal) of the transmission cable at the positive end of the thermionic power generation system output, so that the positive-end voltage correction module can generate a positive-end voltage correction value to compensate for the voltage difference between the positive end of the thermionic power generation system output and the positive end of the power electronic converter input; the negative-end sampling resistor R2 can provide the negative-end voltage correction module with signal information (e.g., a current signal) of the transmission cable at the negative end of the thermionic power generation system output, so that the negative-end voltage correction module can generate a negative-end voltage correction value to compensate for the voltage difference between the negative end of the thermionic power generation system output and the negative end of the power electronic converter input. The addition module can sum the positive terminal voltage correction amount, the negative terminal voltage correction amount and the preset reference voltage to obtain a correction reference voltage, that is, to generate a new reference voltage; by coordinating the correction reference voltage with the voltage sampling module directly sampling the voltage close to the input terminal of the power electronic converter, dynamic fine-tuning of the input terminal voltage of the power electronic converter when the load demand power changes can be achieved, which can ensure that the output terminal of the thermionic power generation system, that is, the near-end voltage, is stable while achieving maximum power transmission energy, thereby achieving stable control of the output terminal of the thermionic power generation system, that is, the near-end voltage, and effectively avoiding signal interference caused by long-distance sampling.

[0038] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A terminal voltage sampling control circuit for a thermionic power generation system, wherein the thermionic power generation system is connected to the input terminal of a power electronic converter, the output terminal of the power electronic converter is connected to a load, and the power electronic converter performs power conversion on the voltage output by the thermionic power generation system and supplies it to the load; characterized in that: The terminal voltage sampling control circuit includes: A reference voltage source, used for outputting a preset reference voltage; a voltage compensation module, connected to the thermionic power generation system, and configured to generate a voltage correction value according to the current output by the thermionic power generation system; an adding module, connected to the reference voltage source and the voltage compensation module, and configured to sum the preset reference voltage and the voltage correction amount to obtain a correction reference voltage; a voltage sampling module, connected to the input terminal of the power electronic converter, and configured to collect the initial voltage at the input terminal of the power electronic converter; and a control and regulation module, whose input end is connected to the adding module and the voltage sampling module, and whose output end is connected to the control end of the power electronic converter module, and is used to adjust the voltage at the input end of the power electronic converter module according to the initial voltage at the input end of the power electronic converter module and the correction reference voltage when the load demand power changes; The output end of the thermionic power generation system includes a positive output end and a negative output end; the input end of the power electronic converter includes a positive input end and a negative input end; the voltage compensation module includes: A positive terminal sampling resistor R1, whose input end is connected to the positive output end of the thermionic power generation system, and whose output end is connected to the positive input end of the power electronic converter; a positive terminal voltage correction module, having a first input end connected to the input end of the positive terminal sampling resistor R1, a second input end connected to the output end of the positive terminal sampling resistor R1, and an output end connected to the adding module, for generating a positive terminal voltage correction value based on the current output by the thermionic power generation system and the resistance value of the positive terminal sampling resistor R1; The voltage compensation module further includes: A negative terminal sampling resistor R2, whose input end is connected to the negative output end of the thermionic power generation system, and whose output end is connected to the negative input end of the power electronic converter; A negative terminal voltage correction module, having a first input end connected to the input end of the negative terminal sampling resistor R2, a second input end connected to the output end of the negative terminal sampling resistor R2, and an output end connected to the adding module, is configured to generate a negative terminal voltage correction amount based on the current output by the thermionic power generation system and the resistance value of the negative terminal sampling resistor R2.

2. The terminal voltage sampling control circuit according to claim 1, characterized in that: The addition module includes: a first adder, a first input end of which is connected to the output end of the positive terminal voltage correction module, and a second input end of which is connected to the output end of the negative terminal voltage correction module, for summing the positive terminal voltage correction amount and the negative terminal voltage correction amount to obtain the positive and negative terminal voltage correction amounts; A second adder, whose first input end is connected to the output end of the first adder, whose second input end is connected to the reference voltage source, and whose output end is connected to the input end of the control and regulation module, is used to sum the positive and negative terminal voltage correction amount and the preset reference voltage to obtain the correction reference voltage.

3. The terminal voltage sampling control circuit according to claim 1, wherein: The control and regulation module includes a control and regulation circuit; and the correction reference voltage is a reference voltage of the control and regulation circuit.

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