High-power combined island simulation system and control method thereof

Abstract

The invention discloses a high-power combined island simulation system and a control method thereof, and solves the technical problems that a large amount of energy consumption, high platform building cost, high-temperature environmental pollution and high fire risk are easily caused because a high-power adjustable RLC load needs to be used for building a test platform in a traditional island test and detection authentication scene. The switch KM1 and the switch KM2 are connected with the power grid and the tested equipment, the passive load RLC unit, the passive load sampling unit and the load test power supply unit are combined to form the test platform, and the main power of the whole load is output by a feedback type, so that the energy consumption, the heat dissipation and the cost can be controlled.

Description

Technical Field

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

[0002] In the current traditional island simulation system testing and certification scenarios, passive devices are basically used in combination with high-power adjustable passive RLC loads to build a test platform, so as to cooperate with the test equipment to conduct island experiments. However, due to the heat dissipation, cost, control, and energy consumption of passive RLC loads during use, it is ultimately difficult to achieve a high-precision, large-capacity, and environmentally friendly test solution.

[0003] In addition, passive devices will generate a lot of heat when working under R load, so the traditional island simulation system will not only cause energy consumption but also have certain environmental hazards and fire risks. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems that in traditional island testing, detection and certification scenarios, a high-power adjustable RLC load is needed to build a test platform, which easily leads to a large amount of energy consumption, high platform construction costs, high temperature environmental pollution and high fire risks, and to provide a high-power combined 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 combined island simulation system is special in that it includes a passive load sampling unit, a passive load RLC unit, a load test power supply unit, a test equipment sampling unit and a current acquisition unit, wherein the passive load RLC unit and the load test power supply unit are connected to one end of a switch KM2 through a wire, the other end of the switch KM2 is connected to one end of a switch KM1, the other end of the switch KM2 is also connected to a test equipment with adjustable internal parameters, and the other end of the switch KM1 is used to connect to a power grid;

[0007] The input end of the passive load sampling unit is also connected to the passive load RLC unit, and is used to collect instantaneous RLC voltage waveform data and instantaneous RLC current waveform data of the passive load RLC unit, and calculate the RLC parameters of the passive load RLC unit;

[0008] The input end of the load test power supply unit is connected to the output end of the passive load sampling unit through a high-speed optical fiber circuit, and is used to synthesize the external RLC parameter setting, the RLC parameters of the passive load RLC unit and the instantaneous RLC current waveform data into an instantaneous current setting, and amplify the instantaneous current setting;

[0009] The device under test sampling unit is connected to the device under test and is used to collect the voltage and current of the device under test;

[0010] The current acquisition unit is connected to the output end of the load test power supply unit and is used to acquire the output end current of the load test power supply unit.

[0011] Further, the passive load sampling unit includes a voltage sampling module, a current sampling module, a first data processing module and a power supply module;

[0012] The input ends of the voltage sampling module and the current sampling module are both connected to the passive load RLC unit, and the output ends are both connected to the first data processing module; they are used to collect instantaneous RLC voltage waveform data and instantaneous RLC current waveform data of the passive load RLC unit, and input them into the first data processing module to calculate the RLC parameters of the passive load RLC unit;

[0013] The power supply module is respectively connected to the voltage sampling module, the current sampling module and the first data processing module, and is used to supply power to the voltage sampling module, the current sampling module and the first data processing module.

[0014] Furthermore, the RLC parameters include resistance value, inductance value, and capacitance value.

[0015] Further, the load test power supply unit includes a second data processing unit, a power amplification module and an RLC parameter debugging module;

[0016] The input end of the second data processing unit is connected to the output end of the current sampling module, the output end of the first data processing module, and the external RLC parameter setting through a high-speed optical fiber circuit, and is used to synthesize the instantaneous current setting by the external RLC parameter setting, the RLC parameters of the passive load RLC unit and the instantaneous RLC current waveform data, and input it to the power amplifier module, and the power amplifier module is connected to one end of the switch KM2;

[0017] The RLC parameter debugging module is connected to the second data processing unit and the power amplification module, and is used to debug the RLC parameters of the second data processing unit and the power amplification module.

[0018] Furthermore, the instantaneous current setting is synthesized by combining the external RLC parameter setting, the RLC parameter of the passive load RLC unit and the instantaneous RLC current waveform data as follows:

[0019] The proportional coefficient is calculated based on the RLC parameters of the passive load RLC unit and the external RLC parameters. KR , KL , KC , the calculation formula is:

[0020]

[0021] Wherein, R, L, and C represent the resistance, inductance, and capacitance of the passive load RLC unit, respectively; RG , LG , CG They represent the resistance, inductance and capacitance values ​​given by the external RLC parameters respectively;

[0022] The proportionality coefficient KR , KL , KC Add them together, and multiply the sum with the instantaneous RLC current waveform data to obtain the instantaneous current setting.

[0023] The present invention also proposes a control method for the above-mentioned high-power combined island simulation system, which is also special in that it includes the following steps:

[0024] S1. Connect the other end of switch KM2 to the equipment under test, and the other end of switch KM1 to the power grid;

[0025] S2, set the power point to be tested of the device under test, close switch KM1, open switch KM2, collect the voltage and current of the device under test through the sampling unit of the device under test, calculate the power of the device under test, adjust the parameters of the device under test, and close switch KM2 after its power reaches the power point to be tested;

[0026] S3, sampling the instantaneous RLC voltage waveform data and the instantaneous RLC current waveform data of the passive load RLC unit through the passive load sampling unit, calculating the instantaneous power, and calculating the RLC parameters of the passive load RLC unit after the instantaneous power reaches more than one sixth of the power point to be tested of the device under test;

[0027] S4, inputting the external RLC parameter setting, the RLC parameters of the passive load RLC unit and the instantaneous RLC current waveform data into the load test power supply unit to synthesize the instantaneous current setting, and amplifying the instantaneous current setting;

[0028] S5, collecting the current of the load test power supply unit through the current collection unit, adjusting the RLC parameters of the load test power supply unit, so that the current of the load test power supply unit reaches the instantaneous current setting after amplification;

[0029] S6. Disconnect switch KM1, the equipment under test is in an island state, and the control of the high-power combined island simulation system is completed.

[0030] In S4, the process of giving the external RLC parameters, inputting the RLC parameters of the passive load RLC unit and the instantaneous RLC current waveform data into the load test power supply unit to synthesize the instantaneous current is:

[0031] Further, the proportional coefficient is calculated based on the RLC parameters of the passive load RLC unit and the external RLC parameters.KR , KL , KC , the calculation formula is:

[0032]

[0033] Wherein, R, L, and C represent the resistance, inductance, and capacitance of the passive load RLC unit, respectively; RG , LG , CG They represent the resistance, inductance and capacitance values ​​given by the external RLC parameters respectively;

[0034] The proportionality coefficient KR , KL , KC Add them together, and multiply the sum with the instantaneous RLC current waveform data to obtain the instantaneous current setting.

[0035] Beneficial effects of the present invention:

[0036] 1. In a high-power combined island simulation system and a control method thereof, switches KM1 and KM2 are used to connect the power grid and the test equipment, and a passive load RLC unit, a passive load sampling unit, and a load test power supply unit are combined to form a test platform. Since the main power of the overall load is output by the load test power supply unit, energy consumption, heat dissipation, and cost can be controlled.

[0037] 2. The high-power combined island simulation system and control method thereof of the present invention have smaller heat dissipation requirements and lower costs than traditional test platforms. Therefore, the combined island simulation system of the present invention is more conducive to the miniaturization of the test platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of an embodiment of a high-power combined island simulation system of the present invention;

[0039] Figure 2 It is a structural schematic diagram of a passive load sampling unit in an embodiment of a high-power combined island simulation system of the present invention;

[0040] Figure 3 It is a structural schematic diagram of a load test power supply unit in an embodiment of a high-power combined island simulation system of the present invention;

[0041] Figure 4 It is a flow chart of an embodiment of a control method of a high-power combined island simulation system of the present invention;

[0042] Figure 5This is a schematic diagram of the change of the port voltage of the device under test and the three currents on the ABC source side of the power grid over time during the pull-off test in an embodiment of a high-power combined island simulation system of the present invention;

[0043] In the figure, the horizontal axis represents time, the vertical axis of CH1 represents the A-phase current of the port of the tested equipment, and the vertical axes of CH2-CH4 represent the ABC three-phase currents on the grid side respectively;

[0044] Figure 6 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 combined island simulation system of the present invention;

[0045] The ordinate represents the island protection time, and the abscissa represents the degree of deviation.

[0046] In the figure, 1-passive load sampling unit, 101-voltage sampling module, 102-current sampling module, 103-first data processing module, 104-power supply module; 2-passive load RLC unit; 3-load test power supply unit, 301-second data processing unit, 302-power amplifier module, 303-RLC parameter debugging module; 4-test equipment; 5-test equipment sampling unit; 6-current acquisition unit. DETAILED DESCRIPTION

[0047] 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.

[0048] This embodiment is a high-power combined island simulation system, such as Figure 1 As shown, it includes a passive load sampling unit 1, a passive load RLC unit 2, a load test power supply unit 3, a test equipment sampling unit 5 and a current acquisition unit 6. The passive load RLC unit 2 and the load test power supply unit 3 are connected to one end of the switch KM2 through a wire, the other end of the switch KM2 is connected to one end of the switch KM1, the other end of the switch KM2 is also connected to the test equipment 4 with adjustable internal parameters, and the other end of the switch KM1 is used to connect to the power grid.

[0049] RLC parameters include resistance, inductance, and capacitance.

[0050] like Figure 2 As shown, the passive load sampling unit 1 includes a voltage sampling module 101, a current sampling module 102, a first data processing module 103 and a power supply module 104;

[0051] The input ends of the voltage sampling module 101 and the current sampling module 102 are both connected to the passive load RLC unit 2, and the output ends are both connected to the first data processing module 103; they are used to collect the instantaneous RLC voltage waveform data and the instantaneous RLC current waveform data of the passive load RLC unit 2, and input them to the first data processing module 103 to calculate the RLC parameters of the passive load RLC unit 2;

[0052] The power supply module 104 is respectively connected to the voltage sampling module 101 , the current sampling module 102 , and the first data processing module 103 , and is used to supply power to the voltage sampling module 101 , the current sampling module 102 , and the first data processing module 103 .

[0053] The load test power supply unit 3 includes a second data processing unit 301, a power amplification module 302 and an RLC parameter debugging module 303;

[0054] The input end of the second data processing unit 301 is connected to the output end of the current sampling module 102, the output end of the first data processing module 103, and the external RLC parameter setting through a high-speed optical fiber circuit, and is used to synthesize the instantaneous current setting by the external RLC parameter setting, the RLC parameters of the passive load RLC unit 2 and the instantaneous RLC current waveform data, and input it to the power amplifier module 302, and the power amplifier module 302 is connected to one end of the switch KM2;

[0055] The RLC parameter debugging module 303 is connected to the second data processing unit 301 and the power amplification module 302 and is used to debug the RLC parameters of the second data processing unit 301 and the power amplification module 302 .

[0056] The instantaneous current setting is synthesized by combining the external RLC parameter setting, the RLC parameter of the passive load RLC unit 2 and the instantaneous RLC current waveform data as follows:

[0057] The proportional coefficient is calculated based on the RLC parameters of the passive load RLC unit 2 and the external RLC parameters. KR , KL , KC , the calculation formula is:

[0058]

[0059] Wherein, R, L, and C represent the resistance value, inductance value, and capacitance value of the passive load RLC unit 2, respectively; RG , LG , CG They represent the resistance, inductance and capacitance values ​​given by the external RLC parameters respectively;

[0060] The proportionality coefficient KR , KL , KCAdd them together, and multiply the sum with the instantaneous RLC current waveform data to obtain the instantaneous current setting.

[0061] The test equipment sampling unit 5 is connected to the test equipment 4 and is used to collect the voltage and current of the test equipment 4;

[0062] The current acquisition unit 6 is connected to the output end of the load test power supply unit 3 and is used to acquire the output end current of the load test power supply unit 3 .

[0063] In this embodiment, the control method of the above-mentioned high-power combined island simulation system includes the following steps:

[0064] S1. Connect the other end of switch KM2 to the test equipment 4, and the other end of switch KM1 to the power grid;

[0065] S2, set the power point to be tested of the test device 4, close the switch KM1, open the switch KM2, collect the voltage and current of the test device 4 through the test device sampling unit 5, and calculate the power of the test device 4, adjust the parameters of the test device 4, and after the power reaches the power point to be tested, close the switch KM2;

[0066] S3, sampling the instantaneous RLC voltage waveform data and the instantaneous RLC current waveform data of the passive load RLC unit 2 through the passive load sampling unit 1, calculating the instantaneous power, and calculating the RLC parameters of the passive load RLC unit 2 after the instantaneous power reaches more than one sixth of the power point to be tested of the test device 4;

[0067] S4, inputting the external RLC parameter setting, the RLC parameters of the passive load RLC unit 2 and the instantaneous RLC current waveform data into the load test power supply unit 3 to synthesize the instantaneous current setting, and amplifying the instantaneous current setting; the process of inputting the external RLC parameter setting, the RLC parameters of the passive load RLC unit 2 and the instantaneous RLC current waveform data into the load test power supply unit 3 to synthesize the instantaneous current setting is:

[0068] The proportional coefficient is calculated based on the RLC parameters of the passive load RLC unit 2 and the external RLC parameters. KR , KL , KC , the calculation formula is:

[0069]

[0070] Wherein, R, L, and C represent the resistance value, inductance value, and capacitance value of the passive load RLC unit 2, respectively; RG , LG , CG They represent the resistance, inductance and capacitance values ​​given by the external RLC parameters respectively;

[0071] The proportionality coefficient KR , KL , KC Add them together, and multiply the sum with the instantaneous RLC current waveform data to obtain the instantaneous current setting.

[0072] The passive load RLC unit 2 and the load test power supply unit 3 as a whole present the set external RLC parameter characteristics to the outside.

[0073] S5, collecting the current of the load test power supply unit 3 through the current collection unit 6, and adjusting the RLC parameters of the load test power supply unit 3 through the RLC parameter debugging module 303, so that the current of the load test power supply unit 3 reaches the amplified instantaneous current setting;

[0074] S6. Disconnect switch KM1, and the device under test 4 is in an island state, completing the control of the high-power combined island simulation system.

[0075] The present invention can use a load test power supply unit 3 in conjunction with a passive load RLC unit 2 to simulate a set RLC characteristic. And because the load test power supply unit 3 is a feedback device, a large amount of energy consumption is avoided, thereby avoiding the problem of a large amount of heat generated by the R load in traditional testing, and avoiding environmental pollution and fire risks caused by load heat dissipation. And the use of the load test power supply unit 3 can compress the RLC load cost, and build a larger test platform, ultimately improving the test revenue and reducing the test cost. The technical problems of the original test scheme that the RLC load cost is too high, the heat dissipation is difficult, and the test magnitude is too small are solved.

[0076] The present invention also supports the upgrade function of the existing test platform, and the test capacity can be non-destructively upgraded without abandoning the original passive platform, thereby improving the test efficiency.

[0077] An islanding experiment was conducted on a high-power combined islanding simulation system of this embodiment:

[0078] Working condition description: Set the power point to be tested of the test equipment 2 to 1MW, and use the passive load RLC unit 2 plus the active load (50% each) to carry out the capacitor pull-off islanding experiment.

[0079] Channel description: The test device 2 is connected to the inverter for island protection. The port voltage of the test device 2 and the three currents on the ABC source side of the power grid change with time as shown in the following figure: Figure 5 As shown, the A phase current of the CH1 test equipment port; CH2-CH4 are the ABC three-phase currents on the grid side. Figure 5 The time between AB indicates the island protection time.

[0080] Under the same working conditions, the island protection time of different capacitors is as follows:

[0081]

[0082] Draw the curve of the pulling degree and protection time in Table 1 as shown in Figure 6 As shown, according to Figure 6 It can be seen that the protection time of the inverter for islanding will decrease as the deviation increases and finally stabilize at the limit value of about 350ms. Compared with the pure passive load experiment, the difference in protection time is small and conforms to the law of the influence of bias on protection time.

[0083] In the high-power combined island simulation system of this embodiment, the use of passive R load is reduced, which can greatly reduce heat generation.

[0084] 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 combined island simulation system, characterized by: It comprises a passive load sampling unit (1), a passive load RLC unit (2), a load test power supply unit (3), a test equipment sampling unit (5) and a current acquisition unit (6), wherein the passive load RLC unit (2) and the load test power supply unit (3) are connected to one end of a switch KM2 through a wire, the other end of the switch KM2 is connected to one end of a switch KM1, the other end of the switch KM2 is also connected to a test equipment (4) with adjustable internal parameters, and the other end of the switch KM1 is used to connect to a power grid; The input end of the passive load sampling unit (1) is also connected to the passive load RLC unit (2) for collecting instantaneous RLC voltage waveform data and instantaneous RLC current waveform data of the passive load RLC unit (2) and calculating the RLC parameters of the passive load RLC unit (2); The first input end of the load test power supply unit (3) is connected to the output end of the passive load sampling unit (1) through a high-speed optical fiber circuit, and the second input end is used to input an external RLC parameter setting; the load test power supply unit (3) is used to synthesize the external RLC parameter setting, the RLC parameters of the passive load RLC unit (2) and the instantaneous RLC current waveform data into an instantaneous current setting, and amplify the instantaneous current setting; The device under test sampling unit (5) is connected to the device under test (4) and is used to collect the voltage and current of the device under test (4); The current acquisition unit (6) is connected to the output end of the load test power supply unit (3) and is used to acquire the output end current of the load test power supply unit (3).

2. According to claim 1, a high-power combined island simulation system is characterized in that: The passive load sampling unit (1) comprises a voltage sampling module (101), a current sampling module (102), a first data processing module (103) and a power supply module (104); The input ends of the voltage sampling module (101) and the current sampling module (102) are both connected to the passive load RLC unit (2), and the output ends are both connected to the first data processing module (103); the voltage sampling module (101) and the current sampling module (102) are respectively used to collect instantaneous RLC voltage waveform data and instantaneous RLC current waveform data of the passive load RLC unit (2), and input them into the first data processing module (103); the first data processing module (103) is used to calculate the RLC parameters of the passive load RLC unit (2) according to the instantaneous RLC voltage waveform data and the instantaneous RLC current waveform data; The power supply module (104) is respectively connected to the voltage sampling module (101), the current sampling module (102), and the first data processing module (103), and is used to supply power to the voltage sampling module (101), the current sampling module (102), and the first data processing module (103).

3. A high-power combined island simulation system according to claim 1 or 2, characterized in that: The RLC parameters include resistance value, inductance value, and capacitance value.

4. According to claim 2, a high-power combined island simulation system is characterized in that: The load test power supply unit (3) comprises a second data processing unit (301), a power amplification module (302) and an RLC parameter debugging module (303); The input end of the second data processing unit (301) is connected to the output end of the current sampling module (102), the output end of the first data processing module (103), and the external RLC parameter setting through a high-speed optical fiber circuit, and is used to synthesize the instantaneous current setting by combining the external RLC parameter setting, the RLC parameters of the passive load RLC unit (2) and the instantaneous RLC current waveform data, and input it to the power amplifier module (302), and the power amplifier module (302) is connected to one end of the switch KM2; The RLC parameter debugging module (303) is used to debug the RLC parameters of the second data processing unit (301) and the power amplification module (302).

5. A high-power combined island simulation system according to claim 1 or 4, characterized in that: The instantaneous current setting is synthesized by synthesizing the external RLC parameter setting, the RLC parameter of the passive load RLC unit (2) and the instantaneous RLC current waveform data into: The proportionality coefficient is calculated based on the RLC parameters of the passive load RLC unit (2) and the external RLC parameters. KR , KL , KC , the calculation formula is: Wherein, R, L, and C represent the resistance value, inductance value, and capacitance value of the passive load RLC unit (2), respectively; RG , LG , CG They represent the resistance, inductance and capacitance values ​​given by the external RLC parameters respectively; The proportionality coefficient KR , KL , KC Add them together, and multiply the sum with the instantaneous RLC current waveform data to obtain the instantaneous current setting.

6. A control method for the high-power combined island simulation system according to claim 1, characterized in that: The following steps are involved: S1. Connect the other end of switch KM2 to the test equipment (4), and the other end of switch KM1 to the power grid; S2, setting the power point to be tested of the device under test (4), closing the switch KM1, opening the switch KM2, collecting the voltage and current of the device under test (4) through the device under test sampling unit (5), calculating the power of the device under test (4), adjusting the parameters of the device under test (4) so ​​that its power reaches the power point to be tested, and then closing the switch KM2; S3, collecting instantaneous RLC voltage waveform data and instantaneous RLC current waveform data of the passive load RLC unit (2) through the passive load sampling unit (1), calculating the instantaneous power, and calculating the RLC parameters of the passive load RLC unit (2) after the instantaneous power reaches more than one sixth of the power point to be measured of the test device (4); S4, inputting the external RLC parameter setting, the RLC parameters of the passive load RLC unit (2) and the instantaneous RLC current waveform data into the load test power supply unit (3) to synthesize the instantaneous current setting, and amplifying the instantaneous current setting; S5, collecting the current of the load test power supply unit (3) through the current collection unit (6), and adjusting the RLC parameters of the load test power supply unit (3) so that the current of the load test power supply unit (3) reaches the instantaneous current setting after amplification; S6, disconnect the switch KM1, the device under test (4) is in an island state, and the control of the high-power combined island simulation system is completed.

7. The control method of a high-power combined island simulation system as claimed in claim 6, characterized in that: In S4, the process of giving the external RLC parameters, inputting the RLC parameters of the passive load RLC unit (2) and the instantaneous RLC current waveform data into the load test power supply unit (3) to synthesize the instantaneous current is as follows: The proportionality coefficient is calculated based on the RLC parameters of the passive load RLC unit (2) and the external RLC parameters. KR , KL , KC , the calculation formula is: Wherein, R, L, and C represent the resistance value, inductance value, and capacitance value of the passive load RLC unit (2), respectively; RG , LG , CG They represent the resistance, inductance and capacitance values ​​given by the external RLC parameters respectively; The proportionality coefficient KR , KL , KC Add them together, and multiply the sum with the instantaneous RLC current waveform data to obtain the instantaneous current setting.

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