CN114069563B - Test method for forced inverter protection - Google Patents
Test method for forced inverter protection Download PDFInfo
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- CN114069563B CN114069563B CN202111350088.6A CN202111350088A CN114069563B CN 114069563 B CN114069563 B CN 114069563B CN 202111350088 A CN202111350088 A CN 202111350088A CN 114069563 B CN114069563 B CN 114069563B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. DC/AC converters
- H02H7/1222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. DC/AC converters responsive to abnormalities in the input circuit, e.g. transients in the DC input
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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Abstract
本发明实施例公开了一种强制逆变保护的测试方法。该强制逆变保护的测试方法包括：将交流电压接入变压器的交流输入端；将直流电压接入变压器的第一直流输入端和/或第二直流输入端；将直流负载接入第二直流输入端；调节变压器的整流模块的触发角；根据交流输入端、第一直流输入端或第二直流输入端的电压波形变化，获取变压器的强制逆变性能。本方案通过交流输入端、第一直流输入端或第二直流输入端的电压波形变化，可以得出变压器强制逆变时直流电流的衰减速度和逆变开始后电压电流波动的大小和阈值，从而分析变压器的强制逆变性能，从而解决变压器直流系统突然发生故障时直流电流无法迅速降低及无法断开短路支线的问题。
The embodiment of the present invention discloses a test method for forced inversion protection. The test method for forced inversion protection includes: connecting an AC voltage to the AC input terminal of a transformer; connecting a DC voltage to the first DC input terminal and/or the second DC input terminal of the transformer; connecting a DC load to the second DC input terminal; adjusting the trigger angle of the rectifier module of the transformer; and obtaining the forced inversion performance of the transformer according to the voltage waveform changes at the AC input terminal, the first DC input terminal or the second DC input terminal. This scheme can obtain the attenuation rate of the DC current during forced inversion of the transformer and the magnitude and threshold of the voltage and current fluctuations after the inversion starts through the voltage waveform changes at the AC input terminal, the first DC input terminal or the second DC input terminal, thereby analyzing the forced inversion performance of the transformer, thereby solving the problem that the DC current cannot be quickly reduced and the short-circuit branch cannot be disconnected when a sudden fault occurs in the DC system of the transformer.
Description
Technical Field
The embodiment of the invention relates to the technical field of power electronics, in particular to a test method for forced inversion protection.
Background
In the power electronics technology, rectification is defined as converting sinusoidal alternating current into direct current by turning on and off power electronic components (high-speed switches made by using power transistors and the like as basic elements), and inversion is defined as converting direct current into sinusoidal alternating current by using power electronic components and filtering devices.
When the traditional alternating current transformer breaks down at the load side, a method for cutting off and isolating the fault position is generally adopted to protect the circuit and the transformer, and the main mode for realizing the functions is to disconnect the circuit breaker when the current passes through the zero point so as to achieve the arc extinguishing effect. However, in a system with ac-dc conversion, when a fault occurs in a dc line, a large amount of residual electromagnetic energy remains in a short time in the line, and the current in the dc line has no zero crossing point, so that the normal operating current and fault current of the dc system cannot effectively break off the current in a short time through the circuit breaker, and at present, there is no dc circuit breaker with good arc quenching capability, so that a novel method is needed to solve the problem.
Disclosure of Invention
The embodiment of the invention provides a test method for forced inversion protection, which is used for detecting the performance of an electronic transformer and solving the problems that the direct current cannot be rapidly reduced and a short circuit branch cannot be disconnected when a transformer direct current system suddenly fails.
In a first aspect, an embodiment of the present invention provides a test method for forced inversion protection, including:
Connecting the alternating current voltage to the alternating current input end of the transformer;
connecting the direct current voltage to a first direct current input end and/or a second direct current input end of the transformer;
connecting a direct current load to a second direct current input end;
adjusting the triggering angle of a rectifying module of the transformer;
and obtaining the forced inversion performance of the transformer according to the voltage waveform change of the alternating current input end, the first direct current input end or the second direct current input end.
Optionally, the test method of forced inversion protection further includes:
And acquiring the harmonic pollution degree of forced inversion according to the voltage harmonic variation of the alternating current input end, the first direct current input end or the second direct current input end.
Optionally, the ac input of the transformer includes a first ac input and a second ac input;
the alternating voltage comprises a first-level alternating voltage and a second-level alternating voltage, and the first-level alternating voltage is unequal to the second-level alternating voltage;
The direct current voltage comprises a first-level direct current voltage and a second-level direct current voltage, and the first-level direct current voltage and the second-level direct current voltage are unequal;
adjusting the firing angle of the rectifier module of the transformer includes:
and adjusting the triggering angle of the rectifying side of the transformer to 150 degrees.
Optionally, the step of connecting an ac voltage to an ac input of the transformer comprises:
Inputting a first-level alternating current voltage into a first alternating current input end;
connecting the direct current voltage to the first direct current input end and/or the second direct current input end of the transformer, wherein the method comprises the following steps:
Inputting a first-level direct current voltage into a first direct current input end;
and obtaining the performance of forced inversion according to the voltage waveform change of the first direct current input end.
Optionally, the step of connecting an ac voltage to an ac input of the transformer comprises:
inputting a second-level alternating current voltage into a second alternating current input end;
connecting the direct current voltage to the first direct current input end and/or the second direct current input end of the transformer, wherein the method comprises the following steps:
Inputting a first-level direct current voltage into a first direct current input end;
and obtaining the performance of forced inversion according to the voltage waveform change of the first direct current input end.
Optionally, the step of connecting an ac voltage to an ac input of the transformer comprises:
Inputting a first-level alternating current voltage into a first alternating current input end;
connecting the direct current voltage to the first direct current input end and/or the second direct current input end of the transformer, wherein the method comprises the following steps:
inputting a second-level direct current voltage into a second direct current input end;
and obtaining the performance of forced inversion according to the voltage waveform change of the second direct current input end.
Optionally, the step of connecting an ac voltage to an ac input of the transformer comprises:
inputting a second-level alternating current voltage into a second alternating current input end;
connecting the direct current voltage to the first direct current input end and/or the second direct current input end of the transformer, wherein the method comprises the following steps:
inputting a second-level direct current voltage into a second direct current input end;
and obtaining the performance of forced inversion according to the voltage waveform change of the second direct current input end.
Optionally, the step of connecting an ac voltage to an ac input of the transformer comprises:
Inputting a first-level alternating current voltage into a first alternating current input end;
inputting a second-level alternating current voltage into a second alternating current input end;
and obtaining the performance of forced inversion according to the voltage waveform change of the first alternating current input end or the second alternating current input end.
Optionally, the step of connecting an ac voltage to an ac input of the transformer comprises:
Inputting a first-level alternating current voltage into a first alternating current input end;
connecting the direct current voltage to the first direct current input end and/or the second direct current input end of the transformer, wherein the method comprises the following steps:
Inputting a first-level direct current voltage into a first direct current input end;
inputting a second-level direct current voltage into a second direct current input end;
And obtaining the performance of forced inversion according to the voltage waveform changes of the first alternating current input end, the first direct current input end and the second direct current input end.
Optionally, the step of connecting an ac voltage to an ac input of the transformer comprises:
inputting a second-level alternating current voltage into a second alternating current input end;
connecting the direct current voltage to the first direct current input end and/or the second direct current input end of the transformer, wherein the method comprises the following steps:
Inputting a first-level direct current voltage into a first direct current input end;
inputting a second-level direct current voltage into a second direct current input end;
And obtaining the performance of forced inversion according to the voltage waveform changes of the second alternating current input end, the first direct current input end and the second direct current input end.
The embodiment of the invention is characterized in that an alternating voltage is connected to an alternating input end of a transformer, a direct voltage is connected to a first direct current input end and/or a second direct current input end of the transformer, a direct current load is connected to a second direct current input end, the triggering angle of a rectifying module of the transformer is regulated, and the attenuation speed of direct current and the magnitude and threshold value of voltage and current fluctuation after the inversion is forced to be inverted are obtained according to the voltage waveform change of the alternating current input end, the first direct current input end or the second direct current input end, so that the usability of the transformer and the influence on equipment, namely the forced inversion performance of the transformer are analyzed. In addition, the optimal forced inversion trigger angle of the transformer under the load can be obtained according to the specific measured direct current voltage and current, so that the problems that the direct current cannot be rapidly reduced and a short circuit branch cannot be disconnected when a direct current system of the transformer suddenly breaks down are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, a brief description will be given below of the drawings required for the embodiments or the description of the prior art, and it is obvious that although the drawings in the following description are specific embodiments of the present invention, it is obvious to those skilled in the art that the basic concepts of the device structure, the driving method and the manufacturing method, which are disclosed and suggested according to the various embodiments of the present invention, are extended and extended to other structures and drawings, and it is needless to say that these should be within the scope of the claims of the present invention.
Fig. 1 is a flow chart of a testing method for forced inversion protection according to an embodiment of the present invention;
fig. 2 is a voltage value change chart of a three-phase ac voltage according to an embodiment of the present invention;
Fig. 3 is a diagram showing an instantaneous voltage value change of a dc voltage when a triggering angle of a rectifying side is 60 degrees in a rectifying process of a transformer according to an embodiment of the present invention;
Fig. 4 is a diagram showing the instantaneous voltage value of the dc voltage when the triggering angle of the rectifying side is 90 degrees in the rectifying process of the transformer according to the embodiment of the present invention;
Fig. 5 is a schematic structural diagram of a test device for simulating forced inversion protection according to an embodiment of the present invention;
Fig. 6 is a decay diagram of dc current during forced inversion according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The inherent circuit structure and rectification-inversion characteristics of the transformer can change an alternating voltage (current) with a certain value into another device with the same frequency or different voltages (currents). When the direct current line faults occur, the fault current in the direct current line can be reduced rapidly by utilizing the rectification characteristic of the transformer, namely, the triggering characteristic of the rectification side is changed by adjusting the control parameter in the direct current controller of the transformer, so that the fault current is reduced rapidly, namely, forced inversion is realized. The forced inversion is used for solving the problem that the direct current cannot be rapidly reduced and the short circuit branch cannot be disconnected when the direct current system connected with the transformer suddenly fails. The transformer can quickly reduce the current in the direct current line to 0 without using a breaker through forced inversion, which is equivalent to breaking the breaker. The forced inversion of the transformer prolongs the service life of the cabinet type breaker of the direct current system through a soft regulation mode, reduces the damage of complete set of switch equipment, and improves the hot standby speed of the system, thereby achieving the purpose of improving the economy and the safety.
Fig. 1 is a flow chart of a testing method for forced inversion protection according to an embodiment of the present invention, which is applicable to testing forced inversion performance of a transformer. The method specifically comprises the following steps:
S110, connecting the alternating voltage to the alternating input end of the transformer.
The transformer is provided with a plurality of alternating current input ends which can be used as a power supply input and a power supply output, and the voltage level of each alternating current input end is different. When the DC system of the transformer suddenly fails, the transformer is forced to invert, the AC input end of the transformer is used as the power input end, and at the moment, the electric energy of the DC system can reversely flow into the AC system connected with the AC input end of the transformer through the transformer.
And S120, connecting the direct current voltage to the first direct current input end and/or the second direct current input end of the transformer.
The first direct current input end and the second direct current input end of the transformer can be used as both a power supply input end and a direct current input end of a power supply output end, and the voltage levels input by the first direct current input end and the second direct current input end are different. When the DC system of the transformer suddenly fails, the transformer is forced to invert, the first DC input end and the second DC input end of the transformer can be used as power output ends, and at the moment, the electric energy of the DC system can reversely flow into an AC system connected with the AC input end of the transformer through the transformer.
S130, connecting the direct current load to the second direct current input end.
The DC load is an adjustable DC load and is used for simulating the work load of the transformer when the transformer works normally after the AC input end of the transformer is connected with the AC voltage and the first DC input end and/or the second DC input end of the transformer are connected with the DC voltage.
S140, adjusting the triggering angle of the rectifying module of the transformer.
The direct current system can work under an active inversion working condition briefly by increasing the triggering angle alpha of the rectifying side of the transformer (or reducing the triggering angle beta of the inversion side), and the energy of the direct current system can be fed into the alternating current system rapidly, so that the purpose of reducing the current of the direct current system rapidly is achieved, and the internal devices of the circuit and the power electronic transformer are protected.
Fig. 2 is a voltage value change chart of a three-phase ac voltage provided by an embodiment of the present invention, fig. 3 is an instantaneous voltage value change chart of a dc voltage when a trigger angle of a rectifying side is 60 degrees in a rectifying process of a transformer provided by an embodiment of the present invention, fig. 4 is an instantaneous voltage value change chart of a dc voltage when a trigger angle of a rectifying side is 90 degrees in a rectifying process of a transformer provided by an embodiment of the present invention, and fig. 2 is a voltage value change chart of a three-phase ac phase voltage in two periods. As shown in fig. 3, when the trigger angle of the transformer at the rectifying side is 60 degrees, the instantaneous value function chart of the rectified dc voltage can be obtained by calculating the effective value, and the effective value of the dc output voltage is at the critical point of starting to decrease. Fig. 4 is a graph of instantaneous value function of the rectified dc voltage when the trigger angle of the rectifying side of the transformer is 90 degrees, and at this time, it can be found that the effective value of the dc voltage is calculated, and at this time, the instantaneous value of the dc voltage output has a negative value, that is, a part of power in the inter-circuit is reverse power, so that in the dc system operating under the working condition of 90 degrees, the effective value of the dc voltage is 0.
By comparing fig. 2-4, it can be known that the triggering angle of the rectifying module of the regulating transformer can be increased to more than 150 degrees by breaking the theoretical triggering angle limit (90 degrees), and the inherent system of the transformer is utilized to make the direct-current voltage completely in the maximum effective value of the reverse power operation, so that the residual energy in the direct-current system is fed back to the alternating-current system quickly through the reverse power mode, thereby quickly reducing the direct-current, enabling the equipment to quickly respond to the fault current without using the circuit breaker to open and close, and effectively prolonging the service life of the cabinet circuit breaker.
S150, obtaining the forced inversion performance of the transformer according to the voltage waveform change of the alternating current input end, the first direct current input end or the second direct current input end.
The voltage waveform change of the alternating current input end, the first direct current input end or the second direct current input end is obtained, the voltage and current waveform condition on the direct current system bus at the beginning of forced inversion can be recorded by utilizing an oscilloscope, the attenuation speed of direct current at the beginning of forced inversion and the magnitude and threshold value of voltage and current fluctuation after the beginning of inversion are obtained according to the voltage and current waveform on the direct current system bus, and therefore the availability of the transformer, namely the forced inversion performance of the transformer, is analyzed. In addition, the optimal forced inversion trigger angle of the transformer under different loads can be obtained according to the specific measured direct current voltage and current.
The embodiment of the invention is characterized in that an alternating voltage is connected to an alternating input end of a transformer, a direct voltage is connected to a first direct current input end and/or a second direct current input end of the transformer, a direct current load is connected to a second direct current input end, the triggering angle of a rectifying module of the transformer is regulated, and the attenuation speed of direct current and the magnitude and threshold value of voltage and current fluctuation after the inversion is started in forced inversion are obtained according to the voltage waveform change of the alternating current input end, the first direct current input end or the second direct current input end, so that the usability of the transformer, namely the forced inversion performance of the transformer is analyzed. In addition, the optimal forced inversion trigger angle of the transformer under different loads can be obtained according to the specific measured direct current voltage and current, so that the problems that the direct current cannot be rapidly reduced and a short circuit branch cannot be disconnected when a direct current system of the transformer suddenly breaks down are solved.
Optionally, the testing method of the forced inversion protection further comprises the step of obtaining the harmonic pollution degree of forced inversion according to the voltage harmonic variation of the alternating current input end, the first direct current input end or the second direct current input end.
The power quality detector can be used for recording voltage harmonic changes of an alternating current input end, a first direct current input end or a second direct current input end so as to determine the harmonic pollution degree of forced inversion of the transformer on surrounding power equipment, thereby protecting the equipment around the transformer and cleaning the electric energy of a power grid timely and effectively.
Optionally, the alternating current input end of the transformer comprises a first alternating current input end and a second alternating current input end, the alternating current voltage comprises a first-level alternating current voltage and a second-level alternating current voltage, the first-level alternating current voltage is unequal to the second-level alternating current voltage, the direct current voltage comprises a first-level direct current voltage and a second-level direct current voltage, the first-level direct current voltage and the second-level direct current voltage are unequal, and adjusting the triggering angle of the rectifying module of the transformer comprises adjusting the triggering angle of the rectifying side of the transformer to 150 degrees.
The first-level alternating-current voltage can be input into a first alternating-current input end of the transformer, the second-level alternating-current voltage can be input into a second alternating-current input end of the transformer, the first-level direct-current voltage can be input into a first direct-current input end of the transformer, and the second-level direct-current voltage can be input into a second direct-current input end of the transformer. The first-level alternating-current voltage is not equal to the second-level alternating-current voltage, and the first-level direct-current voltage is not equal to the second-level direct-current voltage. It can be seen that ac voltages of different grades can only be connected to the ac input of the transformer to which they are matched, and dc voltages of different grades can only be connected to the dc input of the transformer to which they are matched.
The trigger angle of the rectifying side of the transformer is adjusted to 150 ℃ to enable the direct current voltage to be completely in the maximum effective value of reverse power operation, residual energy in the direct current system is fed back to the alternating current system in a reverse power mode, so that direct current is reduced rapidly, equipment can respond to fault current rapidly without using a breaker to break, and the service life of the cabinet type breaker is prolonged effectively.
Fig. 5 is a schematic structural diagram of a test device for simulating forced inversion protection according to an embodiment of the present invention, and as shown in fig. 5, a transformer has 4 ports, which are respectively a 10kV ac input end a (first ac input end), a 380V ac input end B (second ac input end), a 10kV dc input end C (first dc input end), and a 375V dc input end D (second dc input end). Among the four ports, by controlling the rectification-inversion control of the power electronic transformer, power flow between any two ports can be made. The power supply can perform AC-AC conversion, AC-DC conversion and DC-DC conversion, and can freely convert high voltage and low voltage from the aspect of voltage class.
Optionally, the step of connecting an ac voltage to an ac input of the transformer includes:
Inputting a first-level alternating current voltage into a first alternating current input end;
connecting the direct current voltage to the first direct current input end and/or the second direct current input end of the transformer, wherein the method comprises the following steps:
Inputting a first-level direct current voltage into a first direct current input end;
and obtaining the performance of forced inversion according to the voltage waveform change of the first direct current input end.
Illustratively, with continued reference to fig. 5, a 10kV ac input a (first ac input) is connected to the 10kV power grid, i.e., a 10kV ac voltage (first level ac voltage) is input to the 10kV ac input a. The 10KV direct-current input end C is connected with a photovoltaic panel, and the photovoltaic panel can generate 10KV direct-current voltage, namely, the 10KV direct-current voltage (first-level direct-current voltage) can be input into the 10KV direct-current input end C. The transformer is in a dual port mode of operation. The triggering angle of the rectifying module of the transformer is adjusted, and an oscilloscope is arranged at the first direct current input end, so that the voltage waveform change of the electric energy fed into the 10KV alternating current input end A by the 10KV direct current input end C can be measured, and the forced inversion capability of the electric energy fed into the 10KV alternating current input end A by the 10KV direct current input end C is obtained.
Fig. 6 is a graph of attenuation of direct current during forced inversion according to an embodiment of the present invention, as shown in fig. 6, the ordinate is the attenuation rate of direct current during forced inversion, and the abscissa is the time of forced inversion. The performance of forced inversion was evaluated according to fig. 6, and the time difference between the current decay of 10% and 90% was selected to evaluate the performance of forced inversion. When a direct current system fault occurs, the time difference between the current attenuation of 10% and the time difference of 90% intuitively reflects the speed of fault current attenuation, and if the time difference between the current attenuation of 10% and the time difference of 90% are smaller, the effect of forced inversion of the transformer is better, and the protection effect of the circuit is also better.
Optionally, the step of connecting an ac voltage to an ac input of the transformer comprises:
inputting a second-level alternating current voltage into a second alternating current input end;
connecting the direct current voltage to the first direct current input end and/or the second direct current input end of the transformer, wherein the method comprises the following steps:
Inputting a first-level direct current voltage into a first direct current input end;
and obtaining the performance of forced inversion according to the voltage waveform change of the first direct current input end.
Illustratively, with continued reference to fig. 5, a 380V ac input B (second ac input) is connected to the 380V grid, i.e., a 380V ac voltage (second level ac voltage) is input to the 380V ac input B. The 10KV direct current input end C is connected with a photovoltaic panel, and then 10KV direct current voltage (first-level direct current voltage) can be input into the 10KV direct current input end C. The transformer is in a dual port mode of operation. The triggering angle of the rectifying module of the transformer is adjusted, and an oscilloscope is arranged at the first direct current input end, so that the voltage waveform change of the electric energy fed from the 10KV direct current input end C to the 380V alternating current input end B can be measured, and the forced inversion capability of the electric energy fed from the 10KV direct current input end C to the 380V alternating current input end B is obtained.
The forced inversion performance from the DC input end C of the transformer 10KV to the AC input end B of 380V is evaluated, and is the same as that of the embodiment, and the description is omitted here.
Optionally, the step of connecting an ac voltage to an ac input of the transformer comprises:
Inputting a first-level alternating current voltage into a first alternating current input end;
connecting the direct current voltage to the first direct current input end and/or the second direct current input end of the transformer, wherein the method comprises the following steps:
inputting a second-level direct current voltage into a second direct current input end;
and obtaining the performance of forced inversion according to the voltage waveform change of the second direct current input end.
Illustratively, with continued reference to fig. 5, a 10kV ac input a (first ac input) is connected to the 10kV power grid, i.e., a 10kV ac voltage (first level ac voltage) is input to the 10kV ac input a. The direct current input end D of +/-375V is connected to the photovoltaic panel, and the direct current voltage of +/-375V (second level direct current voltage) can be input into the direct current input end D of +/-375V. The transformer is in a dual port mode of operation. The triggering angle of the rectifying module of the transformer is adjusted, and an oscilloscope is arranged at the second direct current input end, so that the voltage waveform change of the electric energy fed into the 10KV alternating current input end A by the direct current input end D with the voltage of +/-375V can be measured, and the forced inversion capability of the electric energy fed into the 10KV alternating current input end A by the direct current input end D with the voltage of +/-375V can be obtained.
The forced inversion performance from the DC input end D of the transformer +/-375V to the AC input end A of 10KV is evaluated, and is the same as that of the embodiment, and the description is omitted here.
Optionally, the step of connecting an ac voltage to an ac input of the transformer comprises:
inputting a second-level alternating current voltage into a second alternating current input end;
connecting the direct current voltage to the first direct current input end and/or the second direct current input end of the transformer, wherein the method comprises the following steps:
inputting a second-level direct current voltage into a second direct current input end;
and obtaining the performance of forced inversion according to the voltage waveform change of the second direct current input end.
Illustratively, with continued reference to fig. 5, a 380V ac input B (second ac input) is connected to the 380V grid, i.e., a 380V ac voltage (second level ac voltage) is input to the 380V ac input B. The direct current input end D of +/-375V is connected to the photovoltaic panel, and the direct current voltage of +/-375V (second level direct current voltage) can be input into the direct current input end D of +/-375V. The transformer is in a dual port mode of operation. The triggering angle of the rectifying module of the transformer is adjusted, and an oscilloscope is arranged at the second direct current input end, so that the voltage waveform change of the electric energy fed from the direct current input end D of +/-375V to the alternating current input end B of 380V can be measured, and the forced inversion capability of the electric energy fed from the direct current input end D of +/-375V to the alternating current input end B of 380V is obtained.
The forced inversion performance from the dc input D of ±375V to the ac input B of 380V of the transformer is evaluated, and is the same as that of the above embodiment, and will not be repeated here.
Optionally, the step of switching the dc voltage to the first dc input and/or the second dc input of the transformer comprises:
Inputting a first-level direct current voltage into a first direct current input end;
inputting a second-level direct current voltage into a second direct current input end;
And obtaining the performance of forced inversion according to the voltage waveform change of the first direct current input end or the second direct current input end.
For example, with continued reference to fig. 5, the 10KV dc input terminal C is connected to the photovoltaic panel, i.e., the 10KV dc voltage (first level dc voltage) may be input to the 10KV dc input terminal C. The direct current input end D of +/-375V is connected to the photovoltaic panel, and the direct current voltage of +/-375V (second level direct current voltage) can be input into the direct current input end D of +/-375V. In this case, the capability of mutually forced inversion in direct current systems of different voltage classes can be detected. If the triggering angle of the rectifying module of the transformer is adjusted and an oscilloscope is arranged at the first direct current input end, the voltage waveform change of the electric energy fed into the direct current input end D of +/-375V from the direct current input end C of 10KV can be measured, and therefore the forced inversion capability of the electric energy fed into the direct current input end D of +/-375V from the direct current input end D of 10KV is obtained. If the triggering angle of the rectifying module of the transformer is adjusted and an oscilloscope is arranged at the second direct current input end, the voltage waveform change of the electric energy fed from the direct current input end D of +/-375V to the direct current input end C of 10KV can be measured, and therefore the forced inversion capability of the direct current input end D of +/-375V for feeding the electric energy to the direct current input end C of 10KV is obtained.
The forced inversion performance of the 10KV direct current input end C of the transformer to the 10KV direct current input end D of +/-375V is evaluated, and the forced inversion performance of the 10KV direct current input end C of the transformer to the 10KV direct current input end D of the transformer is evaluated, and is the same as that of the embodiment, and is not repeated here.
Optionally, the step of connecting an ac voltage to an ac input of the transformer comprises:
Inputting a first-level alternating current voltage into a first alternating current input end;
inputting a second-level alternating current voltage into a second alternating current input end;
and obtaining the performance of forced inversion according to the voltage waveform change of the first alternating current input end or the second alternating current input end.
Illustratively, with continued reference to fig. 5, a 10kV ac input a (first ac input) is connected to the 10kV power grid, i.e., a 10kV ac voltage (first level ac voltage) is input to the 10kV ac input a. The 380V alternating current input end B (second alternating current input end) is connected into a 380V power grid, namely 380V alternating current voltage (second grade alternating current voltage) is input into the 380V alternating current input end B. The ability to force the inversion to each other in ac systems of different voltage classes can be detected at this time. If the triggering angle of the rectifying module of the transformer is adjusted and an oscilloscope is arranged at the first alternating current input end, the voltage waveform change of the electric energy fed from the 10KV alternating current input end A to the 380V alternating current input end B can be measured, and therefore the forced inversion capability of the electric energy fed from the 10KV alternating current input end A to the 380V alternating current input end B is obtained. If the triggering angle of the rectifying module of the transformer is adjusted and an oscilloscope is arranged at the second direct current input end, the voltage waveform change of the electric energy fed into the 10KV alternating current input end A by the 380V alternating current input end B can be measured, and therefore the forced inversion capability of the electric energy fed into the 10KV alternating current input end A by the 380V alternating current input end B is obtained.
The evaluation of the forced inversion performance from the 10KV ac input end a to the 380V ac input end B of the transformer, and the evaluation of the forced inversion performance from the 380V ac input end B to the 10KV ac input end a of the transformer are the same as those of the above embodiments, and are not repeated here.
Optionally, the step of connecting an ac voltage to an ac input of the transformer comprises:
Inputting a first-level alternating current voltage into a first alternating current input end;
connecting the direct current voltage to the first direct current input end and/or the second direct current input end of the transformer, wherein the method comprises the following steps:
Inputting a first-level direct current voltage into a first direct current input end;
inputting a second-level direct current voltage into a second direct current input end;
And obtaining the performance of forced inversion according to the voltage waveform changes of the first alternating current input end, the first direct current input end and the second direct current input end.
Illustratively, with continued reference to fig. 5, a10 kV ac input a (first ac input) is connected to the 10kV power grid, i.e., a10 kV ac voltage (first level ac voltage) is input to the 10kV ac input a. The 10KV direct current input end C is connected with a photovoltaic panel, and then 10KV direct current voltage (first-level direct current voltage) can be input into the 10KV direct current input end C. The direct current input end D of +/-375V is connected to the photovoltaic panel, and the direct current voltage of +/-375V (second level direct current voltage) can be input into the direct current input end D of +/-375V. The transformer is now in a multiport mode of operation. The triggering angle of the rectifying module of the transformer is regulated, oscilloscopes are arranged at the first alternating current input end, the first direct current input end and the second direct current input end, so that the voltage waveform changes of the first alternating current input end, the first direct current input end and the second direct current input end can be measured, and the forced inversion performance of the transformer is obtained.
Optionally, the step of connecting an ac voltage to an ac input of the transformer includes:
inputting a second-level alternating current voltage into a second alternating current input end;
connecting the direct current voltage to the first direct current input end and/or the second direct current input end of the transformer, wherein the method comprises the following steps:
Inputting a first-level direct current voltage into a first direct current input end;
inputting a second-level direct current voltage into a second direct current input end;
And obtaining the performance of forced inversion according to the voltage waveform changes of the second alternating current input end, the first direct current input end and the second direct current input end.
Illustratively, with continued reference to fig. 5, a 380V ac input B (second ac input) is connected to the 380V grid, i.e., a 380V ac voltage (second level ac voltage) is input to the 380V ac input B. The 10KV direct current input end C is connected with a photovoltaic panel, and then 10KV direct current voltage (first-level direct current voltage) can be input into the 10KV direct current input end C. The direct current input end D of +/-375V is connected to the photovoltaic panel, and the direct current voltage of +/-375V (second level direct current voltage) can be input into the direct current input end D of +/-375V. The transformer is now in a multiport mode of operation. The triggering angle of the rectifying module of the transformer is regulated, oscilloscopes are arranged at the second alternating current input end, the first direct current input end and the second direct current input end, so that the voltage waveform changes of the second alternating current input end, the first direct current input end and the second direct current input end can be measured, and the forced inversion performance of the transformer is obtained.
It should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the technical solution described in the above-mentioned embodiments may be modified or some technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiments of the present invention.
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