CN110854857A - Oscillation starting loop and control method thereof - Google Patents
Oscillation starting loop and control method thereof Download PDFInfo
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- CN110854857A CN110854857A CN201910941159.6A CN201910941159A CN110854857A CN 110854857 A CN110854857 A CN 110854857A CN 201910941159 A CN201910941159 A CN 201910941159A CN 110854857 A CN110854857 A CN 110854857A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
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- H03H7/38—Impedance-matching networks
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention provides a starting oscillation loop and a control method thereof, wherein the starting oscillation loop comprises a parallel starting oscillation loop, a series starting oscillation loop, a switch K1 and a switch K2; the series oscillation starting circuit is connected with the switch K1 in parallel and then connected with the microgrid system in series, and the parallel oscillation starting circuit is connected with the switch K2 in series and then connected with the microgrid system in parallel; the parallel oscillation starting circuit and the series oscillation starting circuit are both reactance value adjustable circuits, the oscillation starting circuit and the tested power electronic equipment cannot be coupled, interference on the tested power electronic equipment is avoided, and accuracy and stability of the tested power electronic equipment are improved; the devices adopted by the oscillation starting loop provided by the invention are all passive devices, so that the interference on the tested power electronic equipment can be avoided, the topological structure is simple, and the expansion is easy; the control method of the oscillation starting loop provided by the invention can accurately realize control of each device in the oscillation starting loop, and is simple in control process, easy to realize and easy to popularize.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to a starting oscillation circuit and a control method thereof.
Background
With the rapid development of distributed power supplies, distributed energy storage and micro-grids, the problems of voltage out-of-limit, power quality and the like are brought or aggravated to power grids (especially weak county power grids) after the high-density distributed power supplies are accessed, so that control technologies such as self-adaptive power grid impedance, active power quality control, virtual synchronization and the like are applied; distributed power grid-connected equipment and micro-grid equipment are mostly power electronic devices, are flexible and controllable, but have the characteristics of low damping and weak inertia, and low-frequency oscillation, high-frequency resonance or dispersion instability can occur due to overlarge impedance of terminal weak grid systems such as county power grids and the like and mutual coupling among the power electronic devices. Therefore, no matter the application test of a new technology is carried out, the capability of adapting the distributed power supply and the microgrid to the power grid and the evaluation of the stable boundary of the power grid accessed by the multi-distributed power supply and the multi-microgrid group need to be realized through related test equipment.
And the power frequency withstand voltage tester, the leakage current tester, the power analyzer, the electric energy quality tester, the power grid simulator, the load disturbance device and other detection equipment can only meet the tests of the functions and performances of the power frequency withstand voltage test, the fault recovery grid-connected test, the grid-connected switching test, the exchange power control function test, the anti-islanding protection function test, the electric energy quality test and the like, can not reproduce the problems of oscillation, resonance and the like under complex working conditions, and can not test the boundary of oscillation or dispersion instability of the tested equipment or the tested system.
The American electric energy standard laboratory provides an active oscillation starting circuit, which adopts a full-control power switch device, and because the tested equipment and the testing equipment are active devices, the oscillation starting circuit and the tested power electronic equipment are easy to generate a coupling phenomenon, so that the oscillation starting circuit generates interference on the tested power electronic equipment and influences the normal work of the tested power electronic equipment.
Disclosure of Invention
In order to overcome the defect that the coupling phenomenon is easy to occur between the oscillation starting loop and the tested power electronic equipment in the prior art, the invention provides the oscillation starting loop and a control method thereof, wherein the oscillation starting loop comprises a parallel oscillation starting loop, a series oscillation starting loop, a switch K1 and a switch K2; the series oscillation starting circuit is connected with the switch K1 in parallel and then connected with the microgrid system in series, and the parallel oscillation starting circuit is connected with the switch K2 in series and then connected with the microgrid system in parallel; the parallel oscillation starting circuit and the series oscillation starting circuit are both circuits with adjustable reactance values, the oscillation starting circuit and the tested power electronic equipment cannot be coupled, interference on the tested power electronic equipment is avoided, and accuracy of the tested power electronic equipment cannot be influenced.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
in one aspect, the present invention provides a start-up loop, which includes a parallel start-up loop and a series start-up loop, a switch K1 and a switch K2; the series oscillation starting circuit is connected with the switch K1 in parallel and then connected with the microgrid system in series, and the parallel oscillation starting circuit is connected with the switch K2 in series and then connected with the microgrid system in parallel; the parallel oscillation starting circuit and the series oscillation starting circuit are both reactance value adjustable circuits.
The series oscillation starting circuit comprises a plurality of first oscillation starting units which are connected in parallel.
The parallel oscillation starting circuit comprises a capacitor and a plurality of second oscillation starting units;
and the plurality of second oscillation starting units are connected in parallel and then are connected in series with the capacitor.
The first resonant unit comprises a series connection of reactance and switch KNi, i is 1, 2, …, n is the number of the first resonant unit;
the second oscillation starting unit comprises a series connection of a reactance and a switch KNj, j is 1, 2, … and m, and m is the number of the second oscillation starting units.
The switch K1, the switch K2, the switch KNi, and the switch KNj employ a circuit breaker, a contactor, or a semiconductor switch.
The oscillation starting circuit also comprises a first alternating current interface and a second alternating current interface;
the oscillation starting loop is connected to the microgrid system through a first alternating current interface and a second alternating current interface
The invention also provides a control method of the oscillation starting loop, which comprises the following steps:
when the microgrid system does not need oscillation, the switch K1 is controlled to be closed, the switch K2 is controlled to be opened, and the oscillation starting loop is bypassed;
otherwise, based on the working condition needing to be simulated, the on/off of the switch K1 and the switch K2 are controlled, and the magnitude of the reactance value in the series oscillation starting loop and/or the parallel oscillation starting loop is controlled.
Controlling the on/off of the switch K1 and the switch K2, and causing the microgrid system to oscillate by controlling the reactance value of the series oscillation starting loop, wherein the microgrid system comprises:
when the series oscillation starting loop is only required to be connected into the microgrid system to simulate various strong and weak levels, the switch K1 and the switch K2 are controlled to be switched off, the first oscillation starting units corresponding to the corresponding reactance values are determined from the preset first reactance value combination, the corresponding first oscillation starting units are controlled to be switched on, and other first oscillation starting units are switched off;
when the parallel oscillation starting loop is only required to be connected into the microgrid system to simulate various strong and weak levels, the switch K1 and the switch K2 are controlled to be closed, a second oscillation starting unit corresponding to a corresponding reactance value is determined from a preset second reactance value combination, the corresponding second oscillation starting unit is controlled to be closed, and other second oscillation starting units are controlled to be opened;
when the parallel oscillation starting loop and the series oscillation starting loop are required to be simultaneously connected into the microgrid system to simulate various strong and weak levels, the switch K1 is controlled to be switched off and the switch K2 is controlled to be switched on, the first oscillation starting unit and the second oscillation starting unit corresponding to the corresponding reactance values are determined from the preset third reactance value combination, the corresponding first oscillation starting unit is controlled to be switched on, other first oscillation starting units are switched off, the corresponding second oscillation starting units are controlled to be switched on, and other second oscillation starting units are switched off.
Determination of a first reactance value combination, comprising:
when reactance values of all reactances in the series oscillation starting loop are equal, determining the number of the reactances of the micro-grid system connected into the series oscillation starting loop to obtain n reactance value combinations;
when reactance values of all the reactances in the series oscillation starting loop are not equal to each other, determining the number of the reactances connected into the microgrid system in the series oscillation starting loop to obtain
A combination of reactance values;
when reactance values of all reactances in the series oscillation starting loop are not equal completely, determining the number of the reactances which are connected into the microgrid system in the series oscillation starting loop to obtain the reactance value which is less than that of the microgrid system
A combination of reactance values;
wherein n is the number of switches in the series oscillation starting circuit, and i is the switch index in the series oscillation starting circuit.
Determination of a second reactance value combination, comprising:
when reactance values of all reactances in the parallel oscillation starting loop are equal, determining the number of the reactances connected into the micro-grid system in the parallel oscillation starting loop to obtain m reactance value combinations;
when reactance values of all reactances in the parallel oscillation starting loops are not equal to each other, determining the number of the reactance values of the micro-grid system connected into the parallel oscillation starting loops to obtain
A combination of reactance values;
when reactance values of all reactances in the parallel oscillation starting loop are not equal completely, determining the number of the reactance values of the micro-grid system connected into the parallel oscillation starting loop, and obtaining the reactance values less than or equal to that of the micro-grid system
A combination of reactance values;
wherein m is the number of switches in the parallel oscillation starting circuit, and j is the switch index in the parallel oscillation starting circuit.
Determination of a third reactance value combination, comprising:
when the reactance values of all the reactances in the series oscillation starting loop are equal and the reactance values of all the reactances in the parallel oscillation starting loop are equal, determining the number of the reactances connected into the microgrid system in the series oscillation starting loop and the parallel oscillation starting loop to obtain n multiplied by m reactance value combinations;
when the reactance values of all the reactances in the series oscillation starting loop are equal and the reactance values of all the reactances in the parallel oscillation starting loop are not equal, or the reactance values of all the reactances in the series oscillation starting loop are not equal and the reactance values of all the reactances in the parallel oscillation starting loop are equal, determining the number of the reactances which are connected into the microgrid system in the series oscillation starting loop and the parallel oscillation starting loop, and obtaining the number of the reactances
A combination of reactance values;
when the reactance values of all the reactances in the series oscillation starting loop are equal and the reactance values of all the reactances in the parallel oscillation starting loop are not equal completely, or the reactance values of all the reactances in the series oscillation starting loop are not equal completely and the reactance values of all the reactances in the parallel oscillation starting loop are equal, determining the number of the reactances which are connected into the microgrid system in the series oscillation starting loop and the parallel oscillation starting loop, and obtaining the reactance which is less than or equal to that of the microgrid system in the series oscillation starting loop
A combination of reactance values;
when the reactance values of all the reactances in the series oscillation starting loop and the reactance values of all the reactances in the parallel oscillation starting loop are not equal to each other, determining the number of the reactances connected into the micro-grid system in the series oscillation starting loop and the parallel oscillation starting loop to obtain the number of the reactances
A combination of reactance values;
when the reactance values of all the reactances in the series oscillation starting loop and the reactance values of all the reactances in the parallel oscillation starting loop are not completely equal, determining the number of the reactances which are connected into the micro-grid system in the series oscillation starting loop and the parallel oscillation starting loop, and obtaining the reactance number which is less than that of the micro-grid system
A combination of reactance values.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
the oscillation starting loop provided by the invention comprises a parallel oscillation starting loop, a series oscillation starting loop, a switch K1 and a switch K2; the series oscillation starting circuit is connected with the switch K1 in parallel and then connected with the microgrid system in series, and the parallel oscillation starting circuit is connected with the switch K2 in series and then connected with the microgrid system in parallel; the parallel oscillation starting circuit and the series oscillation starting circuit are both reactance value adjustable circuits, the oscillation starting circuit and the tested power electronic equipment cannot be coupled, interference on the tested power electronic equipment is avoided, and accuracy and stability of the tested power electronic equipment are improved;
the devices adopted by the oscillation starting loop provided by the invention are all passive devices, so that the interference on the tested power electronic equipment can be avoided, the topological structure is simple, and the expansion is easy;
the oscillation starting loop provided by the invention can change the impedance of the microgrid system, and simultaneously causes the microgrid system to oscillate or resonate so as to establish conditions for the stable boundary test of the tested equipment;
the control method of the oscillation starting loop provided by the invention can accurately realize control of each device in the oscillation starting loop, and is simple in control process, easy to realize and easy to popularize.
Drawings
FIG. 1 is a first topology structure diagram of a start-up loop in an embodiment of the present invention;
FIG. 2 is a diagram of a second topology of a start-up loop in an embodiment of the present invention;
FIG. 3 is a third topology structure diagram of the oscillation starting circuit in the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
Embodiment 1 of the present invention provides a vibration starting circuit, and the following describes in detail a specific structure of the vibration starting circuit:
as shown in fig. 1 and fig. 2, the oscillation starting circuit comprises a parallel oscillation starting circuit and a series oscillation starting circuit, a switch K1 and a switch K2; the series oscillation starting circuit is connected with the switch K1 in parallel and then connected with the microgrid system in series, and the parallel oscillation starting circuit is connected with the switch K2 in series and then connected with the microgrid system in parallel; the parallel oscillation starting circuit and the series oscillation starting circuit are both reactance value adjustable circuits.
The series oscillation starting circuit comprises a plurality of first oscillation starting units which are connected in parallel.
The parallel oscillation starting circuit comprises a capacitor and a plurality of second oscillation starting units;
and the plurality of second oscillation starting units are connected in parallel and then are connected in series with the capacitor.
The first resonant unit comprises a series connection of reactance and switch KNi, i is 1, 2, …, n is the number of the first resonant unit;
the second oscillation starting unit comprises a reactance and a switch KNj which are connected in series, wherein j is 1, 2, … and m, and m is the number of the second oscillation starting units.
The switch K1, the switch K2, the switch KNi, and the switch KNj employ a circuit breaker, a contactor, or a semiconductor switch.
The oscillation starting circuit further comprises a first alternating current interface (A1/B1/C1) and a second alternating current interface (A2/B2/C2);
the oscillation starting loop is connected to the microgrid system through the first alternating current interface and the second alternating current interface.
Example 2
Embodiment 2 of the present invention provides a method for controlling a start-oscillation loop, which specifically includes the following steps:
when the microgrid system does not need oscillation, the switch K1 is controlled to be closed, the switch K2 is controlled to be opened, and the oscillation starting loop is bypassed;
otherwise, based on the working condition needing to be simulated, the on/off of the switch K1 and the switch K2 are controlled, and the magnitude of the reactance value in the series oscillation starting loop and/or the parallel oscillation starting loop is controlled.
Controlling the on/off of the switch K1 and the switch K2, and causing the microgrid system to oscillate by controlling the reactance value of the series oscillation starting loop, wherein the microgrid system comprises:
when the series oscillation starting loop is only required to be connected into the microgrid system to simulate various strong and weak levels, the switch K1 and the switch K2 are controlled to be switched off, the first oscillation starting units corresponding to the corresponding reactance values are determined from the preset first reactance value combination, the corresponding first oscillation starting units are controlled to be switched on, and other first oscillation starting units are switched off;
when the parallel oscillation starting loop is only required to be connected into the microgrid system to simulate various strong and weak levels, the switch K1 and the switch K2 are controlled to be closed, a second oscillation starting unit corresponding to a corresponding reactance value is determined from a preset second reactance value combination, the corresponding second oscillation starting unit is controlled to be closed, and other second oscillation starting units are controlled to be opened;
when the parallel oscillation starting loop and the series oscillation starting loop are required to be simultaneously connected into the microgrid system to simulate various strong and weak levels, the switch K1 is controlled to be switched off and the switch K2 is controlled to be switched on, the first oscillation starting unit and the second oscillation starting unit corresponding to the corresponding reactance values are determined from the preset third reactance value combination, the corresponding first oscillation starting unit is controlled to be switched on, other first oscillation starting units are switched off, the corresponding second oscillation starting units are controlled to be switched on, and other second oscillation starting units are switched off.
Determination of a first reactance value combination, comprising:
when reactance values of all reactances in the series oscillation starting loop are equal, determining the number of the reactances of the micro-grid system connected into the series oscillation starting loop to obtain n reactance value combinations;
when reactance values of all the reactances in the series oscillation starting loop are not equal to each other, determining the number of the reactances connected into the microgrid system in the series oscillation starting loop to obtain
A combination of reactance values;
when reactance values of all reactances in the series oscillation starting loop are not equal completely, determining the number of the reactances which are connected into the microgrid system in the series oscillation starting loop to obtain the reactance value which is less than that of the microgrid system
A combination of reactance values;
wherein n is the number of switches in the series oscillation starting circuit, and i is the switch index in the series oscillation starting circuit.
Determination of a second reactance value combination, comprising:
when reactance values of all reactances in the parallel oscillation starting loop are equal, determining the number of the reactances connected into the micro-grid system in the parallel oscillation starting loop to obtain m reactance value combinations;
when reactance values of all reactances in the parallel oscillation starting loops are not equal to each other, determining the number of the reactance values of the micro-grid system connected into the parallel oscillation starting loops to obtain
A combination of reactance values;
when reactance values of all reactances in the parallel oscillation starting loop are not equal completely, determining the number of the reactance values of the micro-grid system connected into the parallel oscillation starting loop, and obtaining the reactance values less than or equal to that of the micro-grid systemA combination of reactance values;
wherein m is the number of switches in the parallel oscillation starting circuit, and j is the switch index in the parallel oscillation starting circuit.
Determination of a third reactance value combination, comprising:
when the reactance values of all the reactances in the series oscillation starting loop are equal and the reactance values of all the reactances in the parallel oscillation starting loop are equal, determining the number of the reactances connected into the microgrid system in the series oscillation starting loop and the parallel oscillation starting loop to obtain n multiplied by m reactance value combinations;
when the reactance values of all the reactances in the series oscillation starting loop are equal and the reactance values of all the reactances in the parallel oscillation starting loop are not equal, or the reactance values of all the reactances in the series oscillation starting loop are not equal and the reactance values of all the reactances in the parallel oscillation starting loop are equal, determining the number of the reactances which are connected into the microgrid system in the series oscillation starting loop and the parallel oscillation starting loop, and obtaining the number of the reactances
A combination of reactance values;
when the reactance values of all the reactances in the series oscillation starting loop are equal and the reactance values of all the reactances in the parallel oscillation starting loop are not equal completely, or the reactance values of all the reactances in the series oscillation starting loop are not equal completely and are connected in parallelWhen the reactance values of all the reactances in the oscillation loops are equal, determining the number of the reactances connected into the microgrid system in the series oscillation starting loop and the parallel oscillation starting loop to obtain the reactance value less than that of the microgrid systemA combination of reactance values;
when the reactance values of all the reactances in the series oscillation starting loop and the reactance values of all the reactances in the parallel oscillation starting loop are not equal to each other, determining the number of the reactances connected into the micro-grid system in the series oscillation starting loop and the parallel oscillation starting loop to obtain the number of the reactancesA combination of reactance values;
when the reactance values of all the reactances in the series oscillation starting loop and the reactance values of all the reactances in the parallel oscillation starting loop are not completely equal, determining the number of the reactances which are connected into the micro-grid system in the series oscillation starting loop and the parallel oscillation starting loop, and obtaining the reactance number which is less than that of the micro-grid system
A combination of reactance values.
The specific relationship between the switch state and the reactance value of the inductor is shown in table 1, where the inductive reactance value ZL of the inductor is 2 pi f · L, and the capacitive reactance value ZC of the capacitor is 1/(2 pi f · C), where f is the operating frequency.
TABLE 1
Example 3
As shown in fig. 3, embodiment 3 of the present invention provides a start-up loop, where the start-up loop includes a parallel start-up loop and a series start-up loop, a switch K1 and a switch K2; the series oscillation starting circuit is connected with the switch K1 in parallel and then connected with the microgrid system in series, and the parallel oscillation starting circuit is connected with the switch K2 in series and then connected with the microgrid system in parallel; the parallel oscillation starting circuit and the series oscillation starting circuit are both reactance value adjustable circuits.
The series oscillation starting circuit comprises 4 first oscillation starting units, and the 4 first oscillation starting units are connected in parallel.
The parallel oscillation starting circuit comprises a capacitor and 4 second oscillation starting units;
and the plurality of second oscillation starting units are connected in parallel and then are connected in series with the capacitor.
The first oscillating unit comprises a series connection of a reactance and a switch KNi, i being 1, 2, …, 4, and the second oscillating unit comprises a series connection of a reactance and a switch KNj, j being 1, 2, …, 4.
The switch K1, the switch K2, the switch KNi, and the switch KNj employ a circuit breaker, a contactor, or a semiconductor switch.
The oscillation starting circuit further comprises a first alternating current interface (A1/B1/C1) and a second alternating current interface (A2/B2/C2);
the oscillation starting loop is connected to the microgrid system through the first alternating current interface and the second alternating current interface.
Example 4
Embodiment 4 of the present invention provides a method for controlling a start-up loop in embodiment 3, which includes the following specific steps:
when the microgrid system does not need oscillation, the switch K1 is controlled to be closed, the switch K2 is controlled to be opened, and the oscillation starting loop is bypassed;
otherwise, based on the working condition needing to be simulated, the on/off of the switch K1 and the switch K2 are controlled, and the magnitude of the reactance value in the series oscillation starting loop and/or the parallel oscillation starting loop is controlled.
Controlling the on/off of the switch K1 and the switch K2, and causing the microgrid system to oscillate by controlling the reactance value of the series oscillation starting loop, wherein the microgrid system comprises:
when the series oscillation starting loop is only required to be connected into the microgrid system to simulate various strong and weak levels, the switch K1 and the switch K2 are controlled to be switched off, the first oscillation starting units corresponding to the corresponding reactance values are determined from the preset first reactance value combination, the corresponding first oscillation starting units are controlled to be switched on, and other first oscillation starting units are switched off;
when the parallel oscillation starting loop is only required to be connected into the microgrid system to simulate various strong and weak levels, the switch K1 and the switch K2 are controlled to be closed, a second oscillation starting unit corresponding to a corresponding reactance value is determined from a preset second reactance value combination, the corresponding second oscillation starting unit is controlled to be closed, and other second oscillation starting units are controlled to be opened;
when the parallel oscillation starting loop and the series oscillation starting loop are required to be simultaneously connected into the microgrid system to simulate various strong and weak levels, the switch K1 is controlled to be switched off and the switch K2 is controlled to be switched on, the first oscillation starting unit and the second oscillation starting unit corresponding to the corresponding reactance values are determined from the preset third reactance value combination, the corresponding first oscillation starting unit is controlled to be switched on, other first oscillation starting units are switched off, the corresponding second oscillation starting units are controlled to be switched on, and other second oscillation starting units are switched off.
Determination of a first reactance value combination, comprising:
when reactance values of all reactances in the series oscillation starting loop are equal, determining the number of the reactances of the micro-grid system connected into the series oscillation starting loop to obtain 4 reactance value combinations;
when reactance values of all the reactances in the series oscillation starting loop are not equal to each other, determining the number of the reactances connected into the micro-grid system in the series oscillation starting loop to obtain 15 reactance value combinations;
when reactance values of all reactances in the series oscillation starting loop are not equal completely, determining the number of the reactances connected into the microgrid system in the series oscillation starting loop to obtain less than 15 reactance value combinations;
determination of a second reactance value combination, comprising:
when reactance values of all reactances in the parallel oscillation starting loop are equal, determining the number of the reactances connected into the micro-grid system in the parallel oscillation starting loop to obtain 4 reactance value combinations;
when reactance values of all reactances in the parallel oscillation starting loops are different from each other, determining the number of the reactance values of the micro-grid system connected into the parallel oscillation starting loops to obtain 15 reactance value combinations;
when reactance values of all reactances in the parallel oscillation starting loops are not equal completely, determining the number of the reactance values of the micro-grid system connected into the parallel oscillation starting loops, and obtaining less than 15 reactance value combinations;
determination of a third reactance value combination, comprising:
when the reactance values of all the reactances in the series oscillation starting loop are equal and the reactance values of all the reactances in the parallel oscillation starting loop are equal, determining the number of the reactances connected into the micro-grid system in the series oscillation starting loop and the parallel oscillation starting loop to obtain 16 reactance value combinations;
when reactance values of all reactances in the series oscillation starting loop are equal and reactance values of all reactances in the parallel oscillation starting loop are not equal, or reactance values of all reactances in the series oscillation starting loop are not equal and reactance values of all reactances in the parallel oscillation starting loop are equal, determining the number of the reactances connected into the micro-grid system in the series oscillation starting loop and the parallel oscillation starting loop, and obtaining 60 reactance value combinations;
when the reactance values of all the reactances in the series oscillation starting loop are equal and the reactance values of all the reactances in the parallel oscillation starting loop are not equal completely, or the reactance values of all the reactances in the series oscillation starting loop are not equal completely and the reactance values of all the reactances in the parallel oscillation starting loop are equal, determining the number of the reactances which are connected into the micro-grid system in the series oscillation starting loop and the parallel oscillation starting loop, and obtaining less than 60 reactance value combinations;
when reactance values of all reactances in the series oscillation starting loop and all reactances in the parallel oscillation starting loop are not equal to each other, determining the number of the reactances connected into the microgrid system in the series oscillation starting loop and the parallel oscillation starting loop to obtain 225 reactance value combinations;
and when the reactance values of all the reactances in the series oscillation starting loop and the reactance values of all the reactances in the parallel oscillation starting loop are not completely equal, determining the number of the reactances connected into the microgrid system in the series oscillation starting loop and the parallel oscillation starting loop, and obtaining less than 225 reactance value combinations.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware when implementing the present application.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.
Claims (11)
1. A start-up circuit, comprising: the parallel oscillation starting circuit and the series oscillation starting circuit are connected with a switch K1 and a switch K2;
the series oscillation starting circuit is connected with the switch K1 in parallel and then connected with the microgrid system in series, and the parallel oscillation starting circuit is connected with the switch K2 in series and then connected with the microgrid system in parallel;
and the parallel oscillation starting circuit and the series oscillation starting circuit are both reactance value adjustable circuits.
2. The starting circuit according to claim 1, wherein the series starting circuit comprises a plurality of first starting units, and the plurality of first starting units are connected in parallel.
3. The oscillation starting circuit of claim 2, wherein the parallel oscillation starting circuit comprises a capacitor and a plurality of second oscillation starting units;
and the plurality of second oscillation starting units are connected in parallel and then are connected in series with the capacitor.
4. The oscillating circuit according to claim 3, wherein the first oscillating unit comprises a series connection of reactance and switch KNi, i-1, 2, …, n being the number of first oscillating units;
the second oscillation starting unit comprises a reactance and a switch KNj which are connected in series, wherein j is 1, 2, … and m, and m is the number of the second oscillation starting units.
5. The oscillating circuit according to claim 4, characterized in that the switches K1, K2, KNi and KNj are circuit breakers, contactors or semiconductor switches.
6. The excitation circuit of claim 1, further comprising a first ac interface and a second ac interface;
the oscillation starting loop is connected to the microgrid system through the first alternating current interface and the second alternating current interface.
7. A method of controlling the start-up loop of any of claims 1 to 6, comprising:
when the microgrid system does not need oscillation, the switch K1 is controlled to be closed, the switch K2 is controlled to be opened, and the oscillation starting loop is bypassed;
otherwise, based on the working condition needing to be simulated, the on/off of the switch K1 and the switch K2 are controlled, and the magnitude of the reactance value in the series oscillation starting loop and/or the parallel oscillation starting loop is controlled.
8. The method for controlling the oscillation starting circuit of claim 7, wherein the controlling the on/off of the switch K1 and the switch K2 and the inducing the microgrid system to oscillate by controlling the magnitude of the reactance of the series oscillation starting circuit comprises:
when the series oscillation starting loop is only required to be connected into the microgrid system to simulate various strong and weak levels, the switch K1 and the switch K2 are controlled to be switched off, the first oscillation starting units corresponding to the corresponding reactance values are determined from the preset first reactance value combination, the corresponding first oscillation starting units are controlled to be switched on, and other first oscillation starting units are switched off;
when the parallel oscillation starting loop is only required to be connected into the microgrid system to simulate various strong and weak levels, the switch K1 and the switch K2 are controlled to be closed, a second oscillation starting unit corresponding to a corresponding reactance value is determined from a preset second reactance value combination, the corresponding second oscillation starting unit is controlled to be closed, and other second oscillation starting units are controlled to be opened;
when the parallel oscillation starting loop and the series oscillation starting loop are required to be simultaneously connected into the microgrid system to simulate various strong and weak levels, the switch K1 is controlled to be switched off and the switch K2 is controlled to be switched on, the first oscillation starting unit and the second oscillation starting unit corresponding to the corresponding reactance values are determined from the preset third reactance value combination, the corresponding first oscillation starting unit is controlled to be switched on, other first oscillation starting units are switched off, the corresponding second oscillation starting units are controlled to be switched on, and other second oscillation starting units are switched off.
9. The method of controlling a start-up loop of claim 8, wherein the determining of the first reactance value combination comprises:
when reactance values of all reactances in the series oscillation starting loop are equal, determining the number of the reactances of the micro-grid system connected into the series oscillation starting loop to obtain n reactance value combinations;
when reactance values of all the reactances in the series oscillation starting loop are not equal to each other, determining the number of the reactances connected into the microgrid system in the series oscillation starting loop to obtain
A combination of reactance values;
when reactance values of all reactances in the series oscillation starting loop are not equal completely, determining the number of the reactances which are connected into the microgrid system in the series oscillation starting loop to obtain the reactance value which is less than that of the microgrid system
A combination of reactance values;
wherein n is the number of switches in the series oscillation starting circuit, and i is the switch index in the series oscillation starting circuit.
10. The method of controlling a start-up loop of claim 9, wherein the determining of the second reactance value combination comprises:
when reactance values of all reactances in the parallel oscillation starting loop are equal, determining the number of the reactances connected into the micro-grid system in the parallel oscillation starting loop to obtain m reactance value combinations;
when reactance values of all reactances in the parallel oscillation starting loops are not equal to each other, determining the number of the reactance values of the micro-grid system connected into the parallel oscillation starting loops to obtain
A combination of reactance values;
when all the reactance in the parallel oscillation starting loop is electrifiedWhen the reactance values are not completely equal, determining the number of the reactance values of the micro-grid system connected into the parallel oscillation starting loop to obtain the reactance values less than or equal to that of the micro-grid system
A combination of reactance values;
wherein m is the number of switches in the parallel oscillation starting circuit, and j is the switch index in the parallel oscillation starting circuit.
11. The method of controlling a start-up loop of claim 10, wherein the determination of the third reactance value combination comprises:
when the reactance values of all the reactances in the series oscillation starting loop are equal and the reactance values of all the reactances in the parallel oscillation starting loop are equal, determining the number of the reactances connected into the microgrid system in the series oscillation starting loop and the parallel oscillation starting loop to obtain n multiplied by m reactance value combinations;
when the reactance values of all the reactances in the series oscillation starting loop are equal and the reactance values of all the reactances in the parallel oscillation starting loop are not equal, or the reactance values of all the reactances in the series oscillation starting loop are not equal and the reactance values of all the reactances in the parallel oscillation starting loop are equal, determining the number of the reactances which are connected into the microgrid system in the series oscillation starting loop and the parallel oscillation starting loop, and obtaining the number of the reactances
A combination of reactance values;
when the reactance values of all the reactances in the series oscillation starting loop are equal and the reactance values of all the reactances in the parallel oscillation starting loop are not equal completely, or the reactance values of all the reactances in the series oscillation starting loop are not equal completely and the reactance values of all the reactances in the parallel oscillation starting loop are equal, determining the number of the reactances which are connected into the microgrid system in the series oscillation starting loop and the parallel oscillation starting loop, and obtaining the reactance which is less than or equal to that of the microgrid system in the series oscillation starting loop
A combination of reactance values;
when the reactance values of all the reactances in the series oscillation starting loop and all the reactances in the parallel oscillation starting loopWhen reactance values of the reactances are not equal to each other, determining the number of the reactances connected into the microgrid system in the series oscillation starting loop and the parallel oscillation starting loop to obtain
A combination of reactance values;
when the reactance values of all the reactances in the series oscillation starting loop and the reactance values of all the reactances in the parallel oscillation starting loop are not completely equal, determining the number of the reactances which are connected into the micro-grid system in the series oscillation starting loop and the parallel oscillation starting loop, and obtaining the reactance number which is less than that of the micro-grid system
A combination of reactance values.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0864873A1 (en) * | 1997-03-12 | 1998-09-16 | Siemens Aktiengesellschaft | Procedure for determining the grounding resistance and house wiring adapted for same |
| CN102129036A (en) * | 2011-01-07 | 2011-07-20 | 中电普瑞科技有限公司 | Movable low-voltage ride-through testing device for wind generating set |
| CN102684225A (en) * | 2012-05-25 | 2012-09-19 | 武汉大学 | Controllable electric reactor based low-voltage ride through system and test method thereof |
| CN104034982A (en) * | 2014-06-19 | 2014-09-10 | 国家电网公司 | Electric energy quality harmonic disturbance source platform |
| CN105548741A (en) * | 2015-12-04 | 2016-05-04 | 中国电力科学研究院 | Method used for detecting low voltage operation capability of reactive power compensator in wind power field |
| CN208334556U (en) * | 2018-07-17 | 2019-01-04 | 云南电网有限责任公司红河供电局 | High pressure ferromagnetic resonance analogue test platform |
-
2019
- 2019-09-30 CN CN201910941159.6A patent/CN110854857A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0864873A1 (en) * | 1997-03-12 | 1998-09-16 | Siemens Aktiengesellschaft | Procedure for determining the grounding resistance and house wiring adapted for same |
| CN102129036A (en) * | 2011-01-07 | 2011-07-20 | 中电普瑞科技有限公司 | Movable low-voltage ride-through testing device for wind generating set |
| CN102684225A (en) * | 2012-05-25 | 2012-09-19 | 武汉大学 | Controllable electric reactor based low-voltage ride through system and test method thereof |
| CN104034982A (en) * | 2014-06-19 | 2014-09-10 | 国家电网公司 | Electric energy quality harmonic disturbance source platform |
| CN105548741A (en) * | 2015-12-04 | 2016-05-04 | 中国电力科学研究院 | Method used for detecting low voltage operation capability of reactive power compensator in wind power field |
| CN208334556U (en) * | 2018-07-17 | 2019-01-04 | 云南电网有限责任公司红河供电局 | High pressure ferromagnetic resonance analogue test platform |
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