A high-power source-load integrated island simulation system and its control method

Abstract

The present invention discloses a high-power source-load integrated island simulation system and a control method thereof, which solves the technical problems that the existing island simulation system needs to use a high-power adjustable RLC load to build a test platform in the detection and certification scene, resulting in a large amount of energy consumption, high platform construction costs, and high-temperature environmental pollution and fire risks; in the present invention, the power supply module is set to two working modes, which can supply power to the tested equipment, and when in the island state, it acts as a PLC load to simulate the set RLC characteristics. Since the power supply module is a feedback device, a large amount of energy consumption is avoided, thereby avoiding the problem of R load generating a large amount of heat in the traditional simulation system, and avoiding environmental pollution and fire risks caused by load heat dissipation. And the use of the power supply module can compress the RLC load cost, and build a larger-scale test platform, ultimately improving the test revenue and reducing the test cost.

Description

Technical Field

[0001] The invention relates to an isolated island simulation system, and in particular to a high-power source-load integrated isolated island simulation system and a control method thereof. Background Art

[0002] In the existing island simulation system, passive components are basically used to build an RLC test platform in the identification scenario, and the anti-island simulation experiment is carried out in conjunction with the test equipment. Since a large number of handovers are used to adjust the load power during the simulation process, it is easy to cause problems such as high platform construction and maintenance costs and low control accuracy. In addition, most of the existing island simulation systems have the defects of huge size, huge heat generation of the R load, and difficulty in miniaturization; in order to overcome this defect, a heat sink is often installed on the island simulation system, but the noise pollution and fire risk caused by the heat sink cannot be ignored.

[0003] Due to the limitations of passive components, the existing island simulation system has insurmountable defects in terms of heat dissipation, cost, control accuracy, energy consumption during use, environmental pollution, etc. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems that the existing island simulation system needs to use a high-power adjustable RLC load to build a test platform in the detection and certification scenario, which leads to a large amount of energy consumption, high platform construction costs, high temperature environmental pollution and fire risks, and to provide a high-power source-load integrated island simulation system and its control method.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A high-power source-load integrated island simulation system.

[0007] It includes an RLC test power supply device and a test device with adjustable RLC parameters. The working modes of the RLC test power supply device include a power supply mode and a load mode. The RLC test power supply device includes a current sampling module, a voltage sampling module, a power supply module, a model calculation module, a given switching module, a data processing module, a power module and a power supply device basic component.

[0008] The current sampling module and the voltage sampling module are connected to the device under test and are used to collect instantaneous current information and instantaneous voltage information of the device under test;

[0009] The power supply module is connected to the current sampling module, the voltage sampling module, and the model calculation module, and the power supply module is used to supply power to the current sampling module, the voltage sampling module, and the model calculation module;

[0010] The first input end of the model calculation module is connected to the output end of the voltage sampling module, and the second input end is connected to the external RLC parameter setting. The model calculation module is used to calculate the instantaneous parameter setting corresponding to the external RLC parameter setting in the load mode;

[0011] The two input ends of the given switching module are respectively connected to the output end of the model calculation module and the external instantaneous voltage given, and are used to select the input instantaneous parameter given of the power module or the external instantaneous voltage given according to the working mode of the RLC test power supply device;

[0012] The input end of the data processing module is connected to the two input ends of the given switching module, and is used to collect the currents of the two input ends of the given switching module and calculate the difference between the two currents;

[0013] The input end of the power module is connected to the output end of a given switching module, and the output end is connected to the device under test, so as to output the external instantaneous voltage or instantaneous parameter to the device under test after power conversion;

[0014] The power supply equipment basic components are respectively connected to the test equipment and a given switching module, and are used to select a power supply mode or a load mode, and supply power to the test equipment in the power supply mode. The RLC parameters of the power supply equipment basic components are adjustable.

[0015] In the model calculation module, the external RLC parameter setting includes the resistance value, inductance value, and capacitance value of the external input.

[0016] In the model calculation module, the formula for calculating the instantaneous parameter given by the external RLC parameter is:

[0017]

[0018] Among them, T s represents the iterative calculation time constant of the model calculation module (104), I ref [0]、I ref [1] I ref [2] represent time t and tT respectively. s Time, t-2T s When the load mode is selected at any time, the instantaneous parameters corresponding to the external RLC parameters are given, where t>2T s , U in [0], U in [2] represent time t and t-2T respectively s The instantaneous voltage information of the device under test (2) at the moment, R, L, C respectively represent the resistance value, inductance value, and capacitance value in the external RLC parameter setting.

[0019] In a given switching module, the input of the power module is selected according to the working mode of the RLC test power supply device:

[0020] When the RLC test power supply device is in the power supply mode, the switching module is given to output the instantaneous voltage of the RLC test power supply device;

[0021] When the RLC test power supply device is in load mode, the instantaneous parameters of the switching module output model calculation module output are given.

[0022] The present invention also proposes a control method for the above-mentioned high-power source-load integrated island simulation system, which is also special in that it includes the following steps:

[0023] S1. Set the power point to be tested of the device under test, select the power supply mode through the basic components of the power supply device, power the device under test, collect the instantaneous current information and instantaneous voltage information of the device under test through the current sampling module and the voltage sampling module, and input the instantaneous voltage information into the model calculation module;

[0024] S2, adjusting the RLC parameters of the device under test so that the power of the device under test reaches the power point to be measured, inputting the external RLC parameter given to the model calculation module, and calculating the instantaneous parameter given corresponding to the external RLC parameter given;

[0025] S3, input the instantaneous parameter setting and the external instantaneous voltage setting into the given switching module, the given switching module outputs the external instantaneous voltage setting to the power module, and the power module performs power conversion and then inputs the test equipment; adjust the RLC parameters of the basic components of the power supply equipment to minimize the current difference between the two input terminals of the given switching module;

[0026] S4. Select the load mode through the basic components of the power supply equipment. The given switching module will give the instantaneous parameters through the power module for power conversion and then input it to the test equipment, providing an island experimental environment for the test equipment and completing the control of the high-power source-load integrated island simulation system.

[0027] The power of the device under test is calculated based on the instantaneous current information and instantaneous voltage information of the device under test.

[0028] The formula for calculating the instantaneous parameters of the RLC test power supply device in load mode described in S2 is given by:

[0029]

[0030] Among them, T s represents the iterative calculation time constant of the model calculation module (104), I ref [0]、I ref [1] I ref [2] represent time t and tT respectively.s Time, t-2T s When the load mode is selected at any time, the instantaneous parameters corresponding to the external RLC parameters are given, where t>2T s , U in [0], U in [2] represent time t and t-2T respectively s The instantaneous voltage information of the device under test (2) at the moment, R, L, C respectively represent the resistance value, inductance value, and capacitance value in the external RLC parameter setting.

[0031] Beneficial effects of the present invention:

[0032] 1. In a high-power source-load integrated island simulation system and its control method of the present invention, the power supply module is set to two working modes, which can supply power to the test equipment. In the island state, it acts as an RLC load to simulate the setting of RLC characteristics. Since the RLC test power supply equipment is a feedback device, a large amount of energy consumption is avoided, thereby avoiding the problem of R load generating a large amount of heat in the traditional simulation system, and avoiding environmental pollution and fire risks caused by load heat dissipation. It can also compress the RLC load cost and build a larger-scale test platform, ultimately improving the test revenue and reducing the test cost. It solves the technical problems of high RLC load cost, difficult heat dissipation, and small test magnitude in the existing island simulation system.

[0033] 2. The present invention provides a high-power source-load integrated island simulation system and a control method thereof. Under power supply state, instantaneous current information of the test equipment is collected through a current sampling module, and the instantaneous RLC parameter given when the power supply module is used as an RLC load is calculated through a model calculation module. The instantaneous parameter given of the external RLC parameter given or the instantaneous voltage given of the RLC test power supply equipment is output through a given switching module to simulate the RLC output characteristics under different given conditions.

[0034] 3. The high-power source-load integrated island simulation system and control method of the present invention have less environmental pollution and a compact structure, and also have certain advantages in high power density. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the connection relationship of RLC test power supply equipment in an embodiment of a high-power source-load integrated island simulation system of the present invention;

[0036] Figure 2 This is a diagram showing the connection relationship between each module in the RLC test power supply device and the device under test in an embodiment of a high-power source-load integrated island simulation system of the present invention (the voltage sampling module, power supply module, data processing module, and power supply device basic components of each module in the RLC test power supply device are not shown);

[0037] Figure 3 A schematic diagram of the connection relationship between the modules of the RLC test power supply device in an embodiment of a high-power source-load integrated island simulation system of the present invention;

[0038] Figure 4 It is a flow chart of an embodiment of a control method of a high-power source-load integrated island simulation system of the present invention;

[0039] Figure 5 It is a schematic diagram showing the variation of the pulling degree obtained by pulling test with the protection time in an embodiment of a high-power source-load integrated island simulation system of the present invention;

[0040] In the figure, the vertical axis represents the island protection time, and the horizontal axis represents the degree of pull-off;

[0041] In the figure, 1-RLC test power supply equipment, 101-current sampling module, 102-voltage sampling module, 103-power supply module, 104-model calculation module, 105-given switching module, 106-data processing module, 107-power module, 108-basic components of power supply equipment; 2-test equipment. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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.

[0043] This embodiment is a high-power source-load integrated island simulation system, such as Figure 1 As shown, it includes an RLC test power supply device 1 and a test device 2. The RLC test power supply device 1 includes a current sampling module 101, a voltage sampling module 102, a power supply module 103, a model calculation module 104, a given switching module 105, a data processing module 106, a power module 107 and a power supply device basic component 108;

[0044] The current sampling module 101 and the voltage sampling module 102 are connected to the device under test 2 and are used to collect instantaneous current information and instantaneous voltage information of the device under test 2;

[0045] The power supply module 103 is connected to the current sampling module 101, the voltage sampling module 102, and the model calculation module 104, and the power supply module 103 is used to supply power to the current sampling module 101, the voltage sampling module 102, and the model calculation module 104;

[0046] The first input terminal of the model calculation module 104 is connected to the output terminal of the voltage sampling module 102, and the second input terminal is connected to the external RLC parameter setting. The model calculation module 104 is used to calculate the instantaneous parameter setting corresponding to the external RLC parameter setting in the load mode;

[0047] In the model calculation module 104, the formula for calculating the instantaneous parameter given corresponding to the external RLC parameter given is:

[0048]

[0049] Among them, T s represents the iterative calculation time constant of the model calculation module 104, I ref [0]、I ref [1] I ref [2] represent time t and tT respectively. s Time, t-2T s When the load mode is selected at any time, the instantaneous parameters corresponding to the external RLC parameters are given, where t>2T s , U in [0], U in [2] represent time t and t-2T respectively s The instantaneous voltage information of the test device 2 at the moment, R, L, and C represent the resistance value, inductance value, and capacitance value in the external RLC parameter setting, respectively.

[0050] The two input ends of the given switching module 105 are respectively connected to the output end of the model calculation module 104 and the external instantaneous voltage given, and are used to select the input instantaneous parameter given or the external instantaneous voltage given of the power module 107 according to the working mode of the RLC test power supply device 1;

[0051] In the given switching module 105, the input of the power module is selected according to the working mode of the RLC test power supply device 1 as follows:

[0052] When the RLC test power supply device 1 is in the power supply mode, the given switching module 105 outputs an external voltage given;

[0053] When the RLC test power supply device 1 is in load mode, the instantaneous parameter output by the output model calculation module 104 is given by the given switching module 105 .

[0054] The input end of the data processing module 106 is connected to the two input ends of the given switching module 105, and is used to collect the currents of the two input ends of the given switching module 105 and calculate the difference between the two currents;

[0055] The input end of the power module 107 is connected to the output end of the given switching module 105, and the output end is connected to the test device 2, and is used to output the external instantaneous voltage or instantaneous parameter to the test device 2 after power conversion;

[0056] The power supply device basic component 108 is respectively connected to the test device 2 and the given switching module 105, and is used to select the power supply mode or the load mode, and supplies power to the test device 2 in the power supply mode. The RLC parameters of the power supply device basic component 108 are adjustable.

[0057] A control method for a high-power source-load integrated island simulation system, such as Figure 3 As shown, the following steps are included:

[0058] S1, set the power point to be tested of the device under test 2, select the power supply mode through the power supply device basic component 108, power the device under test 2, collect the instantaneous current information and instantaneous voltage information of the device under test 2 through the current sampling module 101 and the voltage sampling module 102, and input the instantaneous voltage information into the model calculation module 104;

[0059] S2, adjust the RLC parameters of the test device 2 so that the power of the test device 2 reaches the power point to be measured, input the external RLC parameter setting to the model calculation module 104, and calculate the instantaneous parameter setting corresponding to the external RLC parameter setting; the formula is:

[0060]

[0061] Among them, T s represents the iterative calculation time constant of the model calculation module (104), I ref [0]、I ref [1] I ref [2] represent time t and tT respectively. s Time, t-2T s When the load mode is selected at any time, the instantaneous parameters corresponding to the external RLC parameters are given, where t>2T s , U in [0], U in [2] represent time t and t-2T respectively s The instantaneous voltage information of the device under test (2) at the moment, R, L, C respectively represent the resistance value, inductance value, and capacitance value in the external RLC parameter setting.

[0062] S3, input the instantaneous parameter setting and the external instantaneous voltage setting into the given switching module 105, the given switching module 105 outputs the external instantaneous voltage setting to the power module 107, and inputs the test equipment 2 after power conversion by the power module 107; obtain the current difference between the two input terminals of the given switching module 105 through the data processing module 106, adjust the RLC parameters (i.e. resistance value, inductance value, capacitance value) of the power supply equipment basic component 108, so that the current difference between the two input terminals of the given switching module 105 is minimized; when the current difference between the two input terminals of the given switching module 105 is minimized, the current between the RLC test power supply equipment 1 and the test equipment 2 is closest, which can be used as an island balancing point.

[0063] S4. Select the load mode through the power supply equipment basic component 108, and give the switching module 105 to give the instantaneous parameters, and then input them to the test equipment 2 after power conversion through the power module 107, so as to provide an island experimental environment for the test equipment 2 and complete the control of the high-power source-load integrated island simulation system.

[0064] In the present embodiment, the RLC test power supply device 1 is used to form a test platform. In the test and certification of the anti-islanding function, since the test platform can be provided by only using the RLC test power supply device 1, it can be used as a voltage source and a feedback RLC load in different stages of the test. Therefore, the problems of high energy consumption, large heat dissipation and insufficient control accuracy of the passive RLC load during use are avoided. In addition, the use of this solution also solves the shortcoming that it is difficult to construct a large-scale test platform for the passive RLC load. Compared with the traditional test platform, the heat dissipation conditions in the test platform construction are smaller and the cost is lower. Therefore, the island simulation system in the present embodiment is more conducive to the miniaturization of the test platform.

[0065] The device under test in this embodiment is connected to the inverter for island protection, and a high-power source-load integrated island simulation system controlled by the control method in this embodiment is used. According to the test standard, the island simulation system is subjected to a pull-off test, and the test results are shown in Table 1, wherein the first and third rows indicate the pull-off degree, the second row indicates the island protection time corresponding to the pull-off degree of the first row, and the fourth row indicates the island protection time corresponding to the pull-off degree of the third row:

[0066] Table 1

[0067] Degree of pull 0.9 0.91 0.92 0.93 0.94 0.95 0.96 0.97 0.98 0.99 Island protection time 186 297 310 393 400 434 444 454 489.667 485 Degree of pull 1 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 Island protection time 557.5 520 510 421 442 430 392 381 370 342

[0068] Draw the curve of the pulling degree and protection time in Table 1 as shown in Figure 5 As shown, according to Figure 5 It can be seen that the protection time of the inverter for islanding will decrease as the deviation increases, and finally stabilize at a limit value of about 350ms. Compared with the pure passive load experiment, the difference in protection time is small, and it conforms to the law of the influence of bias on protection time.

[0069] Through the above tests, it can be seen that the use of a bidirectional model in this embodiment further simplifies the composition of the test platform, and only the RLC test power supply device is needed to provide an island experimental environment for the device under test. It can effectively overcome the problems of high energy consumption, large heat dissipation, and insufficient control accuracy when using passive RLC loads in the prior art, and the use of the island simulation system and its control method in this embodiment also solves the shortcoming that it is difficult to build a large-scale test platform with passive RLC loads. In the construction of the test platform, the requirements for heat dissipation conditions are smaller than those of traditional test platforms, and the cost is lower. Therefore, this embodiment is more conducive to the miniaturization of the test platform.

[0070] The above description is only a specific embodiment of the present invention, and a comparison of the effects of the specific embodiments and the related comparative examples, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high-power source-load integrated island simulation system, comprising an RLC test power supply device (1) and a test device (2) with adjustable RLC parameters, wherein the working modes of the RLC test power supply device (1) include a power supply mode and a load mode; and characterized in that: The RLC test power supply device (1) comprises a current sampling module (101), a voltage sampling module (102), a power supply module (103), a model calculation module (104), a given switching module (105), a data processing module (106), a power module (107) and a power supply device basic component (108); The current sampling module (101) and the voltage sampling module (102) are connected to the device under test (2) and are used to collect instantaneous current information and instantaneous voltage information of the device under test (2); The power supply module (103) is connected to the current sampling module (101), the voltage sampling module (102), and the model calculation module (104), and the power supply module (103) is used to supply power to the current sampling module (101), the voltage sampling module (102), and the model calculation module (104); The first input end of the model calculation module (104) is connected to the output end of the voltage sampling module (102), and the second input end is connected to the external RLC parameter setting. The model calculation module (104) is used to calculate the instantaneous parameter setting corresponding to the external RLC parameter setting in the load mode; The two input ends of the given switching module (105) are respectively connected to the output end of the model calculation module (104) and the external instantaneous voltage given, and are used to select the input instantaneous parameter given or the external instantaneous voltage given of the power module (107) according to the working mode of the RLC test power supply device (1); The input end of the data processing module (106) is connected to the two input ends of the given switching module (105), and is used to collect the currents of the two input ends of the given switching module (105) and calculate the difference between the two currents; The input end of the power module (107) is connected to the output end of the given switching module (105), and the output end is connected to the device under test (2), and is used to output the external instantaneous voltage or instantaneous parameter to the device under test (2) after power conversion; The power supply device basic component (108) is respectively connected to the test device (2) and the given switching module (105) and is used to select a power supply mode or a load mode, and supplies power to the test device (2) in the power supply mode. The RLC parameters of the power supply device basic component (108) are adjustable.

2. According to claim 1, a high-power source-load integrated island simulation system is characterized by: In the model calculation module (104), the external RLC parameter setting includes the resistance value, inductance value and capacitance value of the external input.

3. According to claim 2, a high-power source-load integrated island simulation system is characterized in that: In the model calculation module (104), the formula for calculating the instantaneous parameter given corresponding to the external RLC parameter given is: Among them, T s represents the iterative calculation time constant of the model calculation module (104), I ref [0]、I ref [1] I ref [2] represent time t and tT respectively. s Time, t-2T s When the load mode is selected at any time, the instantaneous parameters corresponding to the external RLC parameters are given, where t>2T s , U in [0], U in [2] represent time t and t-2T respectively s The instantaneous voltage information of the device under test (2) at the moment, R, L, C respectively represent the resistance value, inductance value, and capacitance value in the external RLC parameter setting.

4. According to claim 1, a high-power source-load integrated island simulation system is characterized by: The switching module (105) selects the input of the power module (107) according to the working mode of the RLC test power supply device (1), specifically: When the RLC test power supply device (1) is in the power supply mode, the given switching module (105) outputs an external instantaneous voltage given; When the RLC test power supply device (1) is in load mode, the instantaneous parameter output by the given switching module (105) output model calculation module (104) is given.

5. A control method for a high-power source-load integrated island simulation system according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, setting the power point to be tested of the device under test (2), selecting the power supply mode through the power supply device basic component (108), supplying power to the device under test (2), collecting instantaneous current information and instantaneous voltage information of the device under test (2) through the current sampling module (101) and the voltage sampling module (102), and inputting the instantaneous voltage information into the model calculation module (104); S2, adjusting the RLC parameters of the device under test (2) so that the power of the device under test (2) reaches the power point to be measured, inputting the external RLC parameter given to the model calculation module (104), and calculating the instantaneous parameter given corresponding to the external RLC parameter given; S3, inputting the instantaneous parameter setting and the external instantaneous voltage setting into the given switching module (105), the given switching module (105) outputting the external instantaneous voltage setting to the power module (107), and inputting the external instantaneous voltage setting into the test equipment (2) after power conversion by the power module (107); adjusting the RLC parameters of the power supply equipment basic component (108) so that the current difference between the two input terminals of the given switching module (105) is minimized; S4. Select the load mode through the power supply equipment basic component (108), and give the switching module (105) to give the instantaneous parameter, and then input it to the test equipment (2) after power conversion through the power module (107), so as to provide an island experimental environment for the test equipment (2) and complete the control of the high-power source-load integrated island simulation system.

6. The control method of a high-power source-load integrated island simulation system according to claim 5, characterized in that: In S2, the power of the device under test (2) is calculated based on the instantaneous current information and instantaneous voltage information of the device under test (2).

7. The control method of a high-power source-load integrated island simulation system according to claim 5, characterized in that: The formula for calculating the instantaneous parameters of the RLC test power supply device (1) in load mode described in S2 is given by: Among them, T s represents the iterative calculation time constant of the model calculation module (104), I ref [0]、I ref [1] I ref [2] represent time t and tT respectively. s Time, t-2T s When the load mode is selected at any time, the instantaneous parameters corresponding to the external RLC parameters are given, where t>2T s , U in [0], U in [2] represent time t and t-2T respectively s The instantaneous voltage information of the device under test (2) at the moment, R, L, C respectively represent the resistance value, inductance value, and capacitance value in the external RLC parameter setting.

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