Voltage-controlled negative resistor implementation system for guaranteeing power supply safety

Abstract

The invention provides a voltage-controlled negative resistor implementation system and implementation method for guaranteeing power supply safety, and the system comprises a negative resistor which is connected in series in an excitation winding of a generator, and collects the voltage of the excitation winding of the generator, the current of the excitation winding of the generator, and the operation state parameters of the generator; generating a control signal according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operation state parameter of the generator; and controlling the output of the negative resistor based on the control signal, and loading the output of the negative resistor on the excitation power supply of the generator to realize the negative resistance control of the excitation power supply of the generator. The invention provides a voltage-controlled negative resistor implementation system which can be connected in series with a generator excitation system, dynamically adjust the generator excitation resistance and cope with the change of the generator load by adjusting the excitation current, thereby greatly improving the stability of the voltage, frequency and power of the power generation system, avoiding the risks of overvoltage, overcurrent and oscillation of the system, and improving the reliability of the system. And the power supply safety is ensured.

Description

Technical Field

[0001] The present invention relates to the field of power supply safety, and more specifically, to a voltage-controlled negative resistor implementation system for ensuring power supply safety. Background Art

[0002] With the development of science and technology, enterprises have higher and higher demands for power supply and power supply quality, and diversified energy structures have made it possible for enterprises to supply power. Micro and small power generation systems are widely used in various scenarios such as industrial and agricultural production and urban construction. The distributed characteristics of these micro power supply systems reduce the risk of single-point failures in the power grid and improve the reliability of power supply. Microgrids can operate independently and optimize energy utilization efficiency. They can perform comprehensive operation control and optimization according to user needs to maximize energy utilization efficiency. By adopting a variety of distributed power sources and energy storage equipment, they reduce dependence on traditional power grids and enhance the security of energy supply. Micro power supply systems can provide stable power supply to specific areas such as hospitals, schools and other supply guarantee departments to prevent power outages and accidents, achieve energy self-sufficiency, reduce energy dependence on power companies, and also enable the system to have multiple backups and redundancy, improve power supply reliability, and reduce the risk of power outages.

[0003] The active power of the micro-generation system is mainly consumed by the electrical equipment. The adequacy of active power directly affects the frequency change of the power system. Reactive power is used to exchange the electric field and magnetic field in the circuit and to establish and maintain the magnetic field in the electrical equipment. It does not work externally, but is converted into other forms of energy. The balance of reactive power is crucial to maintaining the terminal voltage of the generator. The excitation resistance is directly related to the reactive power and the terminal voltage of the generator. When the inductive reactive load increases, the demagnetization effect is enhanced, and the terminal voltage of the generator decreases. In order to maintain the terminal voltage unchanged, the excitation current needs to be increased. Under the condition of a certain active power, changing the magnitude of the excitation current can adjust the reactive load of the generator and meet the change of the terminal voltage. The time constant of the excitation winding of the synchronous generator is determined by the inductance and resistance. Due to the influence of magnetic circuit saturation, the inductance values ​​corresponding to different excitation currents will be different. In addition, due to the influence of residual magnetism, even the same excitation current may correspond to different inductance values. The change in the working winding temperature is affected by the magnitude of the excitation current, the duration of the working time, the change in ambient temperature, etc., which in turn affects the magnitude of the winding DC resistance. All of these will eventually affect the size of the time constant, causing the time constant to drift. The time constant of the excitation winding is actually a function of multiple variables, rather than a constant that is usually believed.

[0004] Compared with large generators, the micro-generator excitation coil has a relatively large resistance per unit length. The large resistance makes the time constant of the excitation winding small, which will reduce the excitation current and affect the excitation effect, and then affect the generation and maintenance of the magnetic field, which will have an adverse effect on the operating efficiency and stability of the generator. At the same time, it will increase the risk of failure of the entire power generation system, which may lead to more serious electrical failures and safety risks. Summary of the invention

[0005] In view of the technical problems existing in the prior art, the present invention provides a voltage-controlled negative resistor implementation system and implementation method for ensuring power supply safety. The system can be connected in series with the generator excitation system and dynamically adjust the generator excitation resistance. By adjusting the excitation current to cope with changes in the generator load, the stability of the voltage, frequency and power of the power generation system can be greatly improved, the risks of overvoltage, overcurrent and oscillation in the system can be avoided, and the power supply safety can be ensured.

[0006] According to a first aspect of the present invention, a voltage-controlled negative resistor implementation system for ensuring power supply safety is provided, comprising a negative resistor, the negative resistor being connected in series in an excitation winding of a generator, the negative resistor comprising an electrical parameter detection module, a negative resistor control module and a negative resistance driving module, the electrical parameter detection module comprising a voltage sensor, a current sensor and a generator parameter measurement unit;

[0007] The voltage sensor is used to collect the voltage of the generator excitation winding;

[0008] The current sensor is used to collect the current of the generator excitation winding;

[0009] The generator parameter measurement unit is used to collect the operating state parameters of the generator, and the operating state parameters of the generator at least include the operating voltage, operating current, active power and reactive power of the generator;

[0010] The negative resistor control module is used to generate a control signal according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating state parameters of the generator;

[0011] The negative resistance driving module is used to control the output of the negative resistor based on the control signal, and load the output of the negative resistor on the excitation power supply of the generator.

[0012] Based on the above technical solution, the present invention can also make the following improvements.

[0013] Optionally, the electrical parameter detection module includes a first signal conditioning circuit and a second signal conditioning circuit, the first signal conditioning circuit includes a first amplifier and a first filter circuit, and the second signal conditioning circuit includes a second amplifier and a second filter circuit;

[0014] The first amplifier and the first filter are used to amplify or reduce the voltage of the generator excitation winding collected by the voltage sensor to a voltage range that can be processed by the negative resistor control module, and filter it, and transmit the filtered voltage signal of the generator excitation winding to the negative resistor control module;

[0015] The second amplifier and the second filter are used to amplify or reduce the current of the generator excitation winding collected by the current sensor to a current range that the negative resistor control module can handle, and filter it, and transmit the filtered current signal of the generator excitation winding to the negative resistor control module.

[0016] Optionally, the negative resistor control module includes a digital signal processor, and a communication port is integrated in the digital signal processor;

[0017] The digital signal processor is used to generate a voltage control signal according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating state parameters of the generator, and send the voltage control signal to the load driving module through the communication port.

[0018] Optionally, the digital signal processor is used to generate a voltage control signal according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating state parameter of the generator, including:

[0019] When operating in the current control mode, the digital signal processor generates a first value proportional to the current of the generator excitation winding, and generates a voltage control signal based on the first value;

[0020] When operating in the voltage control mode, the digital signal processor generates a second value proportional to the voltage of the generator excitation winding, and generates a voltage control signal based on the second value;

[0021] Wherein, the maximum value of the voltage control signal is limited according to the operating state parameters of the generator.

[0022] Optionally, limiting the maximum value of the voltage control signal according to the operating state parameter of the generator includes:

[0023] Calculate the maximum value of the voltage control signal according to the safety range of the state parameters that make the generator in a stable operating state;

[0024] If the first value is less than or equal to the maximum value, a voltage control signal is generated based on the first value; if the first value is greater than the maximum value, a voltage control signal is generated based on the maximum value;

[0025] If the second value is less than or equal to the maximum value, a voltage control signal is generated based on the second value; if the second value is greater than the maximum value, a voltage control signal is generated based on the maximum value.

[0026] Optionally, the load driving module includes a pulse width modulation signal generator and a rectifier circuit;

[0027] The pulse width modulation signal generator is used to generate a square wave pulse signal with adjustable frequency, amplitude and waveform according to the control signal, wherein the duty cycle of the square wave pulse signal is determined according to the control signal;

[0028] The rectifier circuit is used to convert the AC square wave pulse signal into a DC and load the DC onto the excitation power supply of the generator.

[0029] Optionally, the output positive pole of the rectifier circuit is loaded on the negative pole of the generator excitation power supply, and the output negative pole of the rectifier circuit is loaded on the positive pole of the generator excitation power supply.

[0030] Optionally, the negative resistor control module is further used to:

[0031] According to the voltage of the generator excitation winding and the current of the generator excitation winding, the actual negative resistance value of the generator excitation winding is calculated, and it is determined whether the actual negative resistance value of the generator excitation winding exceeds the preset negative resistance value. If it exceeds, no control signal is generated; if it does not exceed, a control signal is generated according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating status parameters of the generator to control the negative resistance drive module.

[0032] Optionally, the voltage sensor and the current sensor are Hall effect sensors, which are contactless measurements.

[0033] According to a second aspect of the present invention, there is provided a method for implementing a voltage-controlled negative resistor for ensuring power supply safety, comprising:

[0034] Collect the voltage of the generator excitation winding, the current of the generator excitation winding and the operating status parameters of the generator;

[0035] Generate a control signal according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating state parameters of the generator;

[0036] Based on the control signal, the output of the negative resistor is controlled, and the output of the negative resistor is loaded on the excitation power supply of the generator to achieve negative resistance control of the excitation power supply of the generator.

[0037] The present invention provides a voltage-controlled negative resistor implementation system and implementation method for ensuring power supply safety, including a negative resistor, which is connected in series in the excitation winding of the generator to collect the voltage of the excitation winding of the generator, the current of the excitation winding of the generator and the operating state parameters of the generator; a control signal is generated according to the voltage of the excitation winding of the generator, the current of the excitation winding of the generator and the operating state parameters of the generator; based on the control signal, the output of the negative resistor is controlled, and the output of the negative resistor is loaded on the excitation power supply of the generator to achieve negative resistance control of the excitation power supply of the generator. The present invention proposes a voltage-controlled negative resistor implementation system, which can be connected in series with the excitation system of the generator and dynamically adjust the excitation resistance of the generator, and respond to changes in the generator load by adjusting the excitation current, greatly improving the stability of the voltage, frequency and power of the power generation system, avoiding the risks of overvoltage, overcurrent and oscillation in the system, and ensuring power supply safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A structural block diagram of a voltage-controlled negative resistor implementation system for ensuring power supply safety provided by the present invention;

[0039] Figure 2 A schematic diagram of the internal modules of a voltage-controlled negative resistor implementation system for ensuring power supply safety provided by the present invention;

[0040] Figure 3 This is a schematic diagram for setting and judging the negative resistance value of the generator excitation winding. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, the technical features in the various embodiments or single embodiments provided by the present invention can be arbitrarily combined with each other to form a feasible technical solution. This combination is not subject to the constraints of the sequence of steps and / or the structural composition mode, but must be based on the ability of ordinary technicians in this field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] The problem of small time constant of the excitation winding of the micro-generator system can be solved by connecting a negative resistor in series to reduce the equivalent resistance of the excitation circuit to increase the time constant of the excitation winding. The time constant of the excitation winding of the model unit can be flexibly adjusted to meet the needs of different scenarios. The maximum excitation current in the generator excitation system is limited by the resistance of the excitation winding. To reduce the excitation resistance, a negative resistor can be connected in series. This can be achieved by connecting a negative resistor in series. Reducing the resistance of the excitation coil by connecting a negative resistor in series and improving the dynamic characteristics of the excitation circuit play a very important role in the generator excitation system.

[0043] Figure 1 The present invention provides a voltage-controlled negative resistor implementation system for ensuring power supply safety, such as Figure 1 As shown, the voltage-controlled negative resistor implementation system mainly includes a negative resistor, which is connected in series in the excitation winding of the generator to change the resistance of the excitation winding. The negative resistor includes an electrical parameter detection module, a negative resistor control module and a negative resistance drive module, and the electrical parameter detection module includes a voltage sensor, a current sensor and a generator parameter measurement unit.

[0044] The working principle of negative resistor is:

[0045] The voltage sensor is used to collect the voltage of the generator excitation winding;

[0046] The current sensor is used to collect the current of the generator excitation winding;

[0047] The generator parameter measurement unit is used to collect the operating state parameters of the generator, and the operating state parameters of the generator at least include the operating voltage, operating current, active power and reactive power of the generator;

[0048] The negative resistor control module is used to generate a control signal according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating state parameters of the generator;

[0049] The negative resistance driving module is used to control the output of the negative resistor based on the control signal, and load the output of the negative resistor on the excitation power supply of the generator.

[0050] It is understandable that the working voltage and working current of the generator excitation winding are collected, and the operating status parameters of the generator are collected. The operating status parameters of the generator mainly include the working voltage, working current, active power, reactive power, etc. of the generator.

[0051] The negative resistor control module pre-processes the voltage of the generator excitation winding, the current of the generator excitation winding and the operating status parameters of the generator, and generates a corresponding control signal. The negative resistance drive module controls the output of the negative resistor according to the control signal and loads the output of the negative resistor on the excitation power supply of the generator.

[0052] In the excitation circuit of the synchronous motor, the present invention connects in series an additional potential in the same direction as the excitation power supply potential of the synchronous motor and proportional to the excitation current, that is, a reverse voltage source controlled by the excitation current is required, and the ratio of current to voltage, that is, the resistance value of the negative resistor, remains constant and can be adjusted as needed. According to the characteristic that the negative resistor is used in series in the excitation circuit, it can be known that the required negative resistor should be a current-controlled voltage source, which plays the role of current-controlled voltage output. The output voltage is automatically adjusted by using the positive feedback of the load current, and the negative resistance value can be changed by changing the feedback amount of the output current.

[0053] The present invention realizes negative resistance and adopts a feedback system to control the voltage and current of the terminal. The scheme of voltage and current controlling the voltage source can rely on the feedback system composed of an operational amplifier, and the current and voltage sensors can be connected to the circuit to convert the current and voltage signals into voltage signals, and then the voltage signals are processed by the operational amplifier, and finally the voltage proportional to the input is output, and the digital control technology is adopted to realize the precise control of the current and voltage through the digital signal processor and the high-power power electronic device.

[0054] Among them, the voltage sensor and current sensor are Hall effect sensors, which are non-contact measurements. The voltage sensor and current sensor proportionally reduce high voltage and large current to a safe measurable range, and use Hall effect sensors to achieve non-contact measurement, improving safety and measurement accuracy. High-precision voltage sensors and current sensors are used in the measurement, and the voltage and current of the excitation winding during the operation of the generator are measured through external voltage and current transformers, and transmitted to the negative resistor control module.

[0055] See also Figure 2 The electrical parameter detection module also includes a first signal conditioning circuit and a second signal conditioning circuit. The first signal conditioning circuit includes a first amplifier and a first filter circuit. The second signal conditioning circuit includes a second amplifier and a second filter circuit.

[0056] The first amplifier and the first filter are used to amplify or reduce the voltage of the generator excitation winding collected by the voltage sensor to a voltage range that can be processed by the negative resistor control module, and filter it, and transmit the filtered voltage signal of the generator excitation winding to the negative resistor control module;

[0057] The second amplifier and the second filter are used to amplify or reduce the current of the generator excitation winding collected by the current sensor to a current range that the negative resistor control module can handle, and filter it, and transmit the filtered current signal of the generator excitation winding to the negative resistor control module.

[0058] Among them, the negative resistor control module includes a digital signal processor, which is integrated with a communication port; the digital signal processor is used to generate a voltage control signal according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating status parameters of the generator, and send the voltage control signal to the load driving module through the communication port.

[0059] It is understandable that the negative resistor control module mainly uses a digital signal processor to operate the voltage and current signals. Among them, the voltage and current that the digital signal processor can process have a certain range. Therefore, it is necessary to process the voltage of the generator excitation winding collected by the voltage sensor and the current of the generator excitation winding collected by the current sensor so that the voltage and current are within the range that the subsequent digital signal processor can process. The present invention uses a signal conditioning circuit to amplify and filter the voltage and current of the generator excitation winding respectively, so that it is suitable for the input of the digital signal processor and converted into analog and digital signals for data acquisition, control process, execution or other purposes. The signal conditioning circuit amplifies, filters and adjusts the signal output by the sensor to ensure the accuracy of the measurement result. The filtering circuit performs filtering processing on the collected data. The signal conditioning circuit includes components such as amplifiers and filters. The amplifier is used to adjust the input signal level to better match the voltage range, and the filter is used to remove noise and interference in the signal. At the same time, the collected data is calibrated to eliminate the nonlinear error and temperature drift error of the sensor circuit. The electrical parameter detection module realizes high-precision electrical parameter detection through sensors, signal conditioning, filtering and other modules.

[0060] The scheme of realizing the current control current source by using the analog system to realize the negative resistor control module mainly relies on the voltage and current detection and feedback control strategy. First, the voltage and current values ​​of the generator excitation winding are collected. The circuit can work under high common mode voltage and provide a current output proportional to the current and with the ground level as the reference point. This output is used for feedback control to accurately adjust the current source output. The detected current signal is processed to generate a feedback signal to act on the input end. The voltage and current values ​​at the output end are compared with the set value using analog devices such as operational amplifiers and comparators to form a feedback control system. An error signal is generated to adjust the pulse width modulation parameters for power supply output. The calculated reference voltage value is input to the negative resistor rectifier control end through pulse width modulation to simulate the electrical characteristics of the negative resistor to realize closed-loop control, realizing accurate control of the voltage source, and having the advantages of fast response speed and high control accuracy. The feedback circuit used has the characteristics of low distortion, high stability, and low ripple. This scheme realizes accurate control of the power supply through the design and control of analog circuits.

[0061] Exemplarily, the digital signal processor is used to generate a voltage control signal according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating state parameter of the generator, including:

[0062] When operating in the current control mode, the digital signal processor generates a first value proportional to the current of the generator excitation winding, and generates a voltage control signal based on the first value; when operating in the voltage control mode, the digital signal processor generates a second value proportional to the voltage of the generator excitation winding, and generates a voltage control signal based on the second value; wherein the maximum value of the voltage control signal is limited according to the operating state parameters of the generator.

[0063] It is understandable that the digital signal processor in the negative resistor control module generates a voltage control signal according to the voltage and current of the generator excitation winding and the operating state parameters of the generator, and the voltage control signal controls the subsequent load driving module.

[0064] Among them, when generating a voltage control signal according to the voltage and current of the generator excitation winding, the digital signal processor can generate the voltage control signal by different operation methods according to different control modes. The control mode mainly includes a voltage control mode and a current control mode. When the voltage control mode is adopted, the digital signal processor multiplies the voltage of the generator excitation winding by a coefficient to obtain a value (called the first value), and generates the voltage control signal according to the first value. When the current control mode is adopted, the digital signal processor multiplies the current of the generator excitation winding by a coefficient to obtain a value (called the second value), and generates the voltage control signal according to the second value.

[0065] Among them, in order to ensure that the generator operates in a stable state, the operating state parameters of the generator need to be maintained within a stable range. For example, the reactive power of the generator needs to be maintained within a stable range. According to the need for the operating state parameters of the generator to be maintained within a stable range, the maximum value of the generated voltage control signal can be calculated, that is, the first value and the second value cannot exceed this maximum value.

[0066] Exemplarily, if the first value is less than or equal to a maximum value, a voltage control signal is generated based on the first value; if the first value is greater than the maximum value, a voltage control signal is generated based on the maximum value; if the second value is less than or equal to the maximum value, a voltage control signal is generated based on the second value; if the second value is greater than the maximum value, a voltage control signal is generated based on the maximum value.

[0067] It is understandable that when the first value or the second value is less than or equal to the maximum value, a voltage control signal can be generated based on the first value or the second value; if the first value or the second value is greater than the maximum value, the first value or the second value can only take the maximum value, and at this time, a voltage control signal is generated based on the maximum value.

[0068] Exemplarily, the load driving module includes a pulse width modulation signal generator and a rectifier circuit; the pulse width modulation signal generator is used to generate a square wave pulse signal with adjustable frequency, amplitude and waveform according to the control signal, wherein the duty cycle of the square wave pulse signal is determined according to the control signal; the rectifier circuit is used to convert the AC square wave pulse signal into DC and load the DC onto the excitation power supply of the generator.

[0069] Understandably, see Figure 2 ,The negative resistance driving module mainly includes a pulse width modulation signal generator and a rectifier circuit.

[0070] The negative resistance voltage and current control process is implemented in the negative resistance drive module. The main function of the negative resistance voltage and current control is to adjust the feedback parameters of the system according to the working conditions. Its control logic is based on the input current to regulate the output voltage of the rectifier circuit, and there is a certain proportional relationship between its output voltage and input current. The negative resistance voltage and current control process is as follows: the voltage and current transformers detect the magnitude of the input voltage and current, the generator parameter measurement unit measures the basic electrical parameters of the generator, and the output voltage and current are controlled by the measurement results to achieve negative resistance. The implementation process includes a feedback mechanism. In the current control mode, the output current is monitored and the output voltage is fed back and adjusted to ensure that the proportional relationship between it and the input current, that is, the gain is constant. The gain can be automatically adjusted according to the test data and user input, and the corresponding output voltage is generated according to the detected input electrical parameters and the user-preset proportional coefficient, and the output voltage is precisely controlled through the feedback and adjustment mechanism. The resistance value can be adjusted and modified in real time according to system requirements to maintain the high-precision operation of the negative resistor and the power generation system.

[0071] The voltage and current control of the voltage-controlled negative resistor has excellent static and dynamic characteristics. The static characteristics are mainly manifested in the relatively constant negative resistance value. The current flowing through the negative resistor and the corresponding data of the voltage across the negative resistor are measured by the impressed current method to draw a curve. The curve is a straight line passing through the zero point, and its straight line slope is the set negative resistance value. The dynamic characteristics are manifested in the response characteristics of the output voltage of the negative resistor to the input current. In the dynamic state, if the voltage suddenly increases or decreases, the voltage and current of the negative resistor change synchronously, the waveform is basically the same, and there is no time lag. When the excitation winding with the negative resistor operates in a high compensation state, the negative resistor still maintains good operating stability. The high-power negative resistor has a nearly ideal negative resistance characteristic, a large adjustment range, and stable operation, especially under high compensation conditions. It can still maintain stable operation.

[0072] In order to realize the negative resistor, the positive output of the rectifier circuit is loaded on the negative pole of the generator excitation power supply, and the negative output of the rectifier circuit is loaded on the positive pole of the generator excitation power supply to reduce the resistance of the generator excitation winding.

[0073] Among them, see Figure 3 , the negative resistor control module is also used for:

[0074] According to the voltage of the generator excitation winding and the current of the generator excitation winding, the actual negative resistance value of the generator excitation winding is calculated, and it is determined whether the actual negative resistance value of the generator excitation winding exceeds the preset negative resistance value. If it exceeds, no control signal is generated; if it does not exceed, a control signal is generated according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating status parameters of the generator to control the negative resistance drive module.

[0075] It is understandable that the maximum value of the negative resistance value can be set through the interface, and the actual negative resistance value of the excitation winding can be calculated based on the voltage of the generator excitation winding collected by the voltage sensor and the current of the generator excitation winding collected by the current sensor. If the actual negative resistance value of the excitation winding is greater than the set maximum value, the digital signal processor will not generate a control signal and will not perform negative resistance control on the excitation power supply. If the actual negative resistance value of the excitation winding is less than the set maximum value, the digital signal processor will generate a control signal and control the negative resistance drive module to drive the rectifier circuit to perform negative feedback on the generator excitation power supply.

[0076] The present invention also provides a method for realizing a voltage-controlled negative resistor for ensuring power supply safety, the method comprising:

[0077] Step 1, collecting the voltage of the generator excitation winding, the current of the generator excitation winding and the operating state parameters of the generator;

[0078] Step 2, generating a control signal according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating state parameters of the generator;

[0079] Step 3: Based on the control signal, control the output of the negative resistor, load the output of the negative resistor on the excitation power supply of the generator, and realize negative resistance control of the excitation power supply of the generator.

[0080] It is understandable that the working voltage and working current of the generator excitation winding are collected, and the operating status parameters of the generator are collected. The operating status parameters of the generator mainly include the working voltage, working current, active power, reactive power, etc. of the generator.

[0081] After preprocessing the voltage of the generator excitation winding, the current of the generator excitation winding and the operating status parameters of the generator, a corresponding control signal is generated. According to the control signal, the output of the negative resistor is controlled and loaded on the excitation power supply of the generator.

[0082] It can be understood that the voltage-controlled negative resistor implementation method for ensuring power supply safety provided by the present invention corresponds to the voltage-controlled negative resistor implementation system for ensuring power supply safety provided by the aforementioned embodiments. The relevant technical features of the voltage-controlled negative resistor implementation system for ensuring power supply safety can refer to the relevant technical features of the voltage-controlled negative resistor implementation system for ensuring power supply safety, which will not be repeated here.

[0083] The embodiment of the present invention provides a voltage-controlled negative resistor implementation system and implementation method for ensuring power supply safety, which has the following advantages:

[0084] (1) The voltage-controlled negative resistor can obtain accurate reference current and reference voltage values ​​by collecting the voltage and current values ​​at the output end of the generator excitation winding, thereby achieving precise control of the negative resistance value.

[0085] (2) The voltage-controlled negative resistor can be simply modified to adjust the control strategy as needed to achieve a variety of control modes, such as voltage control and flow control.

[0086] (3) The system has a fast response speed and can quickly respond to changes in voltage and current and adjust the output of the voltage source in real time to ensure the stability and accuracy of the system output.

[0087] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0088] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0089] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0090] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0091] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0092] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0093] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A voltage-controlled negative resistor implementation system for ensuring power supply safety, characterized in that: It includes a negative resistor, which is connected in series in the excitation winding of the generator. The negative resistor includes an electric parameter detection module, a negative resistor control module and a negative resistance driving module. The electric parameter detection module includes a voltage sensor, a current sensor and a generator parameter measurement unit; The voltage sensor is used to collect the voltage of the generator excitation winding; The current sensor is used to collect the current of the generator excitation winding; The generator parameter measurement unit is used to collect the operating state parameters of the generator, and the operating state parameters of the generator at least include the operating voltage, operating current, active power and reactive power of the generator; The negative resistor control module is used to generate a control signal according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating state parameters of the generator; The negative resistance driving module is used to control the output of the negative resistor based on the control signal, and load the output of the negative resistor on the excitation power supply of the generator.

2. The voltage-controlled negative resistor implementation system according to claim 1, characterized in that: The electrical parameter detection module includes a first signal conditioning circuit and a second signal conditioning circuit, the first signal conditioning circuit includes a first amplifier and a first filter circuit, and the second signal conditioning circuit includes a second amplifier and a second filter circuit; The first amplifier and the first filter are used to amplify or reduce the voltage of the generator excitation winding collected by the voltage sensor to a voltage range that can be processed by the negative resistor control module, and filter it, and transmit the filtered voltage signal of the generator excitation winding to the negative resistor control module; The second amplifier and the second filter are used to amplify or reduce the current of the generator excitation winding collected by the current sensor to a current range that the negative resistor control module can handle, and filter it, and transmit the filtered current signal of the generator excitation winding to the negative resistor control module.

3. The voltage-controlled negative resistor implementation system according to claim 1 or 2, characterized in that: The negative resistor control module includes a digital signal processor, and a communication port is integrated in the digital signal processor; The digital signal processor is used to generate a voltage control signal according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating state parameters of the generator, and send the voltage control signal to the load driving module through the communication port.

4. The voltage-controlled negative resistor implementation system according to claim 3, characterized in that: The digital signal processor is used to generate a voltage control signal according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating state parameter of the generator, including: When operating in the current control mode, the digital signal processor generates a first value proportional to the current of the generator excitation winding, and generates a voltage control signal based on the first value; When operating in the voltage control mode, the digital signal processor generates a second value proportional to the voltage of the generator excitation winding, and generates a voltage control signal based on the second value; Wherein, the maximum value of the voltage control signal is limited according to the operating state parameters of the generator.

5. The voltage-controlled negative resistor implementation system according to claim 4, characterized in that: The limiting the maximum value of the voltage control signal according to the operating state parameter of the generator comprises: Calculate the maximum value of the voltage control signal according to the safety range of the state parameters that make the generator in a stable operating state; If the first value is less than or equal to the maximum value, a voltage control signal is generated based on the first value; if the first value is greater than the maximum value, a voltage control signal is generated based on the maximum value; If the second value is less than or equal to the maximum value, a voltage control signal is generated based on the second value; if the second value is greater than the maximum value, a voltage control signal is generated based on the maximum value.

6. The voltage-controlled negative resistor implementation system according to claim 1, characterized in that: The load driving module includes a pulse width modulation signal generator and a rectifier circuit; The pulse width modulation signal generator is used to generate a square wave pulse signal with adjustable frequency, amplitude and waveform according to the control signal, wherein the duty cycle of the square wave pulse signal is determined according to the control signal; The rectifier circuit is used to convert the AC square wave pulse signal into a DC and load the DC onto the excitation power supply of the generator.

7. The voltage-controlled negative resistor implementation system according to claim 6, characterized in that: The positive output electrode of the rectifier circuit is loaded on the negative electrode of the generator excitation power supply, and the negative output electrode of the rectifier circuit is loaded on the positive electrode of the generator excitation power supply.

8. The voltage-controlled negative resistor implementation system according to claim 1, characterized in that: The negative resistor control module is also used for: Calculating the actual negative resistance value of the generator excitation winding according to the voltage of the generator excitation winding and the current of the generator excitation winding, and determining whether the actual negative resistance value of the generator excitation winding exceeds the preset negative resistance value, and if so, not generating a control signal; If it does not exceed, a control signal is generated according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating state parameters of the generator to control the negative resistance drive module.

9. The voltage-controlled negative resistor implementation system according to claim 1, characterized in that: The voltage sensor and the current sensor are Hall effect sensors and are non-contact measurement sensors.

10. A method for implementing a voltage-controlled negative resistor for ensuring power supply safety, characterized in that: include: Collect the voltage of the generator excitation winding, the current of the generator excitation winding and the operating status parameters of the generator; Generate a control signal according to the voltage of the generator excitation winding, the current of the generator excitation winding and the operating state parameters of the generator; Based on the control signal, the output of the negative resistor is controlled, and the output of the negative resistor is loaded on the excitation power supply of the generator to achieve negative resistance control of the excitation power supply of the generator.

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