Large-current rod control simulation test system and method

Abstract

The invention belongs to the technical field of reactor control rod power supply systems, and particularly relates to a large-current rod control simulation test system and method. The device comprises an isolation transformer, a filter, an inversion converter, a rectification converter, an AC rod power supply and a DC rod power supply, one end of the isolation transformer is connected with the filter, the other end of the isolation transformer is connected to an AC power grid through a line switch, the other end of the filter is connected with the inversion converter, and the other end of the inversion converter is connected with the rectification converter through a circuit. The AC rod power supply is connected with the rectification converter through the AC line switch, and the DC rod power supply is connected to a DC circuit between the inversion converter and the rectification converter. The device can reduce test power consumption, is used for AC / DC hybrid power supply input, is high in flexibility, can be used for simulating each load working condition of a nuclear power rod power supply system, and can meet the requirement of long-term large-current operation assessment.

Description

Technical Field

[0001] The invention belongs to the technical field of reactor control rod power supply system, and in particular relates to a large current rod control simulation test system and method. Background Art

[0002] In the load capacity simulation test of the reactor control rod power supply, a new type of high-current rod control simulation test method of energy feedback electronic load was studied for the first time. The traditional simulation test of the rod power supply system consists of an electromagnetic coil and a controller. The three electromagnetic coils simulate the lifting coil, transfer coil and holding coil of the control rod drive mechanism under the condition of the maximum rod bundle operation. The controller simulates the current timing change of the control rod drive mechanism to excite the three electromagnetic coils, thereby simulating the maximum operating condition of the multi-beam control rod drive mechanism and verifying the performance of the rod power supply system. However, since the maximum operating current can reach thousands of amperes and the current change can reach hundreds of amperes within 1 second, the circuit structure and simulated load form of the traditional simulation test method have problems such as high energy consumption, huge heat generation, and low flexibility, resulting in high energy consumption and high cost for a single test, and it is impossible to conduct long-term live test assessment of the rod power supply system. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a large current rod control simulation test system and method, which can reduce the test power consumption, and is used for AC / DC hybrid power input, has high flexibility, and can be used to simulate various load conditions of nuclear power rod power supply systems and long-term large current operation assessment requirements.

[0004] The technical solution adopted by the present invention is:

[0005] A large current rod control simulation test system includes an isolation transformer, a filter, an inverter converter, a rectifier converter, an AC rod power supply, and a DC rod power supply. One end of the isolation transformer is connected to the filter, and the other end is connected to the AC power grid through a line switch. The other end of the filter is connected to the inverter converter, and the other end of the inverter converter is connected to the rectifier converter through a circuit. The AC rod power supply is connected to the rectifier converter through an AC line switch, and the DC rod power supply is connected to the DC circuit between the inverter converter and the rectifier converter.

[0006] The DC rod power supply is connected to the DC circuit between the inverter and the rectifier converter via a DC line switch and a diode, and can isolate the DC voltage output by the rectifier converter to avoid reverse power supply to the DC rod power supply.

[0007] The inverter converter and the rectifier converter are composed of a three-phase full bridge, and the inverter converter and the rectifier converter use fully controlled switching devices to achieve current conversion, and an intermediate capacitor is arranged on the DC side.

[0008] The fully controlled switching device is an IGBT.

[0009] It also includes two controllers. A Hall sensor is respectively provided on the DC side and AC side of the inverter and rectifier converter, and the controllers are respectively connected to the two Hall sensors.

[0010] The Hall sensor collects current and voltage signals and sends them to the controller.

[0011] The controller includes a voltage regulator, a current regulator, and a power factor regulator to achieve core control of voltage, current, phase, and frequency.

[0012] The controller controls the magnitude and phase of the AC current by using a fully controlled switch device and a SVPWM mode, so that the phase difference angle between the voltage and current sinusoidal waveforms can be set within a certain range as needed.

[0013] A high current rod control simulation test method, based on a high current rod control simulation test system, comprises the following steps:

[0014] Step 1: construct a large current rod control simulation test system, and configure test parameters in the controller, wherein the test parameters include the rod control current size and timing of the test;

[0015] Step 2: Power on the AC power supply and / or DC power supply to be tested. If the controller does not detect any fault, proceed to step 3; otherwise, the test will be automatically terminated.

[0016] Step 3, close the AC line switch and the DC line switch, and the controller in the rectifier-converter determines whether there is an AC power supply input. If so, the rectifier-converter performs rectification and stabilizes the output DC voltage at a set value; if there is no AC power supply input, the rectifier-converter is stopped after a delay, and only the DC power supply is used as input to supply power to the inverter converter. If there is no AC power supply input, the test is terminated, and the loop AC line switch and DC line switch are disconnected;

[0017] Step 4: The Hall sensor on the DC side of the inverter collects the actual rod control timing current, and the controller in the AC converter compares the set timing current with the actual current, and generates a current control signal to make the DC amplitude and timing change consistent with the set simulated load;

[0018] Step 5: The Hall sensor on the AC side of the inverter collects the characteristic values ​​of the three-phase AC power supply, extracts the grid voltage, frequency, and phase values, and converts the DC power into AC power that matches the grid through controllable devices and adopts the SVPWM mode. Finally, the electric energy is sent back to the grid through the filter and isolation transformer to realize energy feedback.

[0019] Step 6: When the test reaches the preset test time, stop the current output and stop the test.

[0020] In step 5, the synchronization of the power grid is detected in real time during the process to prevent the inverter output from being out of synchronization with the power grid, thereby preventing overcurrent and overvoltage from occurring.

[0021] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0022] (1) The present invention provides a large current rod control simulation test system and method, which can flexibly simulate various operating conditions of the control rod drive mechanism in actual engineering. While providing load for the rod power system, that is, generating simulated current timing changes of the control rod drive mechanism, most of the electric energy is fed back to the AC power grid without pollution. It has low power consumption and high flexibility, and can meet the needs of AC, DC, and AC / DC hybrid rod power load tests.

[0023] (2) The present invention provides a high-current rod control simulation test system and method, which can adjust the load current with high precision and stepless operation, meeting the requirements of the project for long-term live test assessment of the rod power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of the structure of a high current rod control simulation test system provided by the present invention;

[0026] Figure 2 A topological diagram of a high current rod control simulation test system provided by the present invention;

[0027] Figure 3 A flow chart of a high current rod control simulation test system provided by the present invention;

[0028] In the figure: 1- isolation transformer, 2- filter, 3- inverter converter, 4- rectifier converter, 5- AC rod power supply, 6- DC rod power supply, 7- intermediate capacitor, 8- controller, 9- Hall sensor, 10- diode, 11- fully controlled switching device, 12- AC line switch, 13- DC line switch. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of 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.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figure 1 and Figure 2 As shown, a large current rod control simulation test system provided by the present invention includes an isolation transformer 1, a filter 2, an inverter converter 3, a rectifier converter 4, an AC rod power supply 5, a DC rod power supply 6, an intermediate capacitor 7, a controller 8, a Hall sensor 9, a diode 10, a fully controlled switch device 11, an AC line switch 12, and a DC line switch 13. One end of the isolation transformer 1 is connected to the filter 2, and the other end is connected to the AC power grid through the line switch 12. The other end of the filter 2 is connected to the inverter converter 3, and the other end of the inverter converter 3 is connected to the rectifier converter 4 through a circuit. The AC rod power supply 5 is connected to the rectifier converter 4 through the AC line switch 12, and the DC rod power supply 6 is connected to the DC circuit between the inverter converter 3 and the rectifier converter 4 through the DC line switch 13 and the diode 10;

[0033] The inverter converter 3 and the rectifier converter 4 are composed of a three-phase full bridge, and the inverter converter 3 and the rectifier converter 4 use a fully controlled switch device 11 (such as IGBT) to achieve current conversion, and an intermediate capacitor 7 is set on the DC side; it also includes a controller 8, and the DC side and AC side of the inverter converter 3 and the rectifier converter 4 are respectively provided with a Hall sensor 9, and the controller 8 is connected to two Hall sensors 9 respectively, and the Hall sensor 9 collects current and voltage signals and sends them to the controller 8; the controller 8 includes a voltage regulator, a current regulator, and a power factor regulator to achieve core control of voltage, current, phase, and frequency;

[0034] The positive electrode of the DC rod power supply 6 is provided with a diode 10, which can isolate the DC voltage output by the rectifier converter 4 to avoid reverse power supply to the DC rod power supply.

[0035] The controller 8 controls the magnitude and phase of the AC current by using the fully controlled switch device 11 in SVPWM mode, so that the phase difference angle between the voltage and current sinusoidal waveforms can be set within a certain range as needed.

[0036] The present invention provides a high current rod control simulation test method, such as Figure 3 As shown, the following steps are included:

[0037] Step 1: construct a high current rod control simulation test system, and configure test parameters in the controller 8, including the rod control current size and timing of the test;

[0038] Step 2: Power on the AC power supply 5 and / or DC power supply 6 to be tested. If the controller 8 does not detect a fault, proceed to step 3, otherwise the test will be automatically terminated;

[0039] Step 3, close the AC line switch 12 and the DC line switch 13, and the controller 8 in the rectifier inverter 4 determines whether there is an AC rod power supply 5 input. If so, the rectifier inverter 4 performs rectification and stabilizes the output DC voltage at a set value (usually the set value is slightly higher than the output voltage value of the DC rod power supply); if there is no AC rod power supply 5 input, the rectifier inverter 4 is stopped after a delay, and only the DC rod power supply 6 is used as the input to supply power to the inverter inverter 3. If there is none, the test is terminated and the loop AC line switch 12 and the DC line switch 13 are disconnected.

[0040] Step 4, the Hall sensor 9 on the DC side of the inverter 3 collects the actual rod-controlled timing current, and the controller 8 in the AC converter 4 compares the set timing current with the actual generation, and produces a current control signal to make the DC amplitude and timing changes consistent with the set simulated load.

[0041] Step 5: The Hall sensor 9 on the AC side of the inverter 4 collects the characteristic values ​​of the three-phase AC power supply, extracts the grid voltage, frequency, and phase value, and converts the DC power into AC power that matches the grid through the controllable device 11 in SVPWM mode. Finally, the electric energy is sent back to the grid through the filter 2 and the isolation transformer 1 to realize energy feedback. During the process, the grid synchronization is detected in real time to prevent the inverter output from being out of sync with the grid, resulting in overcurrent, overvoltage, etc.

[0042] Step 6: When the test reaches the preset test time, stop the current output and stop the test.

[0043] The high-current rod control simulation test method proposed in the present invention realizes an energy-feedback electronic load through two converter components, can accept mixed input of AC and DC power supplies, and can simulate various control rod operating conditions through control methods, providing test loads for AC, DC, and AC / DC hybrid rod power systems of Hualong One, Linglong One and other reactor types. It has the characteristics of low energy consumption and high flexibility, and meets the requirements of the project for long-term live test and assessment of the rod power system.

[0044] The present invention adopts a converter based on DSP / FPGA / IGBT technology, configures corresponding isolation transformers and filters on the grid side, and configures low-voltage devices such as circuit breakers and diodes on the DC side to form an AC / DC electronic load system. By configuring the corresponding interface loop, according to different operating modes, functions such as remote external start, stop, and load current setting can be realized to complete the large current rod control simulation test load.

[0045] The rectifier and inverter converter composed of power electronic power devices such as IGBT used in the present invention controls the input current to simulate various operating conditions of the reactor control rod operation, and feeds energy back to the power grid; the converter is composed of a three-phase full-bridge, and an intermediate capacitor is set on the DC side of the module. It uses a fully controlled switching device IGBT to achieve current conversion, and adopts a space voltage vector pulse width modulation mode (SVPWM). Modular converter components are used as the front and rear stages of the electronic load power conversion. The front stage is used to rectify and control the DC bus voltage, and the rear stage is used to invert and control the current amplitude and phase, so as to achieve high power factor, low harmonics and pollution-free energy feedback to the power grid;

[0046] The AC side of the inverter is connected to the AC grid through a filter, so that the current waveform injected into the AC grid is a sine waveform, which can meet the relevant national THD standards for the power injected into the grid. At the same time, it has excellent dynamic characteristics and can achieve a current change rate of 20A / ms. The inverter has a modular structure, and the inverters can be mirror-connected, paralleled, and series-connected, making it easy to form a high-power load system;

[0047] The core control function is completed by the controller, and the control structure includes voltage regulator, current regulator, and power factor regulator; Hall sensors are set on both the AC side and the DC side to collect current and voltage signals and send them to the controller. Due to the use of controllable devices IGBT, the size and phase of the AC current can be controlled through the appropriate SVPWM mode, so that the phase difference angle between the voltage and current sine waveforms can be set within a certain range as needed.

[0048] A diode is used on the DC power supply side to isolate AC and DC. No mechanical switch is required for isolation switching to avoid mutual influence between the two. It is suitable for simulating the load of AC / DC hybrid rod power supply.

[0049] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0050] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high current rod control simulation test system, characterized in that: The invention comprises an isolation transformer (1), a filter (2), an inverter (3), a rectifier (4), an AC rod power supply (5), and a DC rod power supply (6); one end of the isolation transformer (1) is connected to the filter (2), and the other end is connected to an AC power grid through a line switch (12); the other end of the filter (2) is connected to the inverter (3); the other end of the inverter (3) is connected to the rectifier (4) through a circuit; the AC rod power supply (5) is connected to the rectifier (4) through the AC line switch (12); and the DC rod power supply (6) is connected to the DC circuit between the inverter (3) and the rectifier (4).

2. The high current rod control simulation test system according to claim 1 is characterized in that: The DC rod power supply (6) is connected to the DC circuit between the inverter (3) and the rectifier (4) via a DC line switch (13) and a diode (10), and can isolate the DC voltage output by the rectifier (4) to avoid reverse power supply to the DC rod power supply.

3. The high current rod control simulation test system according to claim 1, characterized in that: The inverter converter (3) and the rectifier converter (4) are composed of a three-phase full bridge, the inverter converter (3) and the rectifier converter (4) use a fully controlled switch device (11) to achieve current conversion, and an intermediate capacitor (7) is provided on the DC side.

4. The high current rod control simulation test system according to claim 3 is characterized in that: The fully controlled switch device (11) is an IGBT.

5. The high current rod control simulation test system according to claim 3 is characterized in that: It also includes two controllers (8), the DC side and AC side of the inverter (3) and the rectifier (4) are respectively provided with a Hall sensor (9), and the controller (8) is respectively connected to the two Hall sensors (9).

6. The high current rod control simulation test system according to claim 5, characterized in that: The Hall sensor (9) collects current and voltage signals and sends them to the controller (8).

7. The high current rod control simulation test system according to claim 6, characterized in that: The controller (8) comprises a voltage regulator, a current regulator and a power factor regulator, and realizes core control of voltage, current, phase and frequency.

8. The high current rod control simulation test system according to claim 7, characterized in that: The controller (8) controls the magnitude and phase of the alternating current through a fully controlled switch device (11) in an SVPWM mode, so that the phase difference angle between the voltage and current sinusoidal waveforms can be set within a certain range as required.

9. A high current rod control simulation test method, based on a high current rod control simulation test system, characterized in that: The steps include: Step 1: construct a large current rod control simulation test system, and configure test parameters in the controller (8), wherein the test parameters include the rod control current size and timing of the test; Step 2, power on the AC power supply (5) and / or DC power supply (6) to be tested. If the controller (8) does not detect any fault, proceed to step 3, otherwise the test will be automatically terminated; Step 3, close the AC line switch (12) and the DC line switch (13), and the controller (8) in the rectifier converter (4) determines whether there is an AC rod power supply (5) input. If so, the rectifier converter (4) performs rectification and stabilizes the output DC voltage at a set value; if there is no AC rod power supply (5) input, the rectifier converter (4) is stopped after a delay, and only the DC rod power supply (6) is used as input to supply power to the inverter converter (3); if there is no AC rod power supply (5), the test is terminated, and the loop AC line switch (12) and the DC line switch (13) are disconnected; Step 4: The Hall sensor (9) on the DC side of the inverter (3) collects the rod-controlled timing current actually generated, and the controller (8) in the AC converter (4) compares the set timing current with the actual generation, and generates a current control signal to make the DC amplitude and timing change consistent with the set simulated load; Step 5: The Hall sensor (9) on the AC side of the inverter (4) collects characteristic values ​​of the three-phase AC power supply, extracts the voltage, frequency and phase value of the power grid, and converts the DC power into AC power matching the power grid through the controllable device (11) in SVPWM mode. Finally, the electric energy is sent back to the power grid through the filter (2) and the isolation transformer (1) to realize energy feedback. Step 6: When the test reaches the preset test time, stop the current output and stop the test.

10. The method according to claim 9, characterized in that: In step 5, the synchronization of the power grid is detected in real time during the process to prevent the inverter output from being out of synchronization with the power grid, thereby preventing overcurrent and overvoltage from occurring.

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