CN217036764U - Interconnection control device for series-connection type and parallel-connection type power electronic converters of power distribution network - Google Patents
Interconnection control device for series-connection type and parallel-connection type power electronic converters of power distribution network Download PDFInfo
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Abstract
The utility model provides a power distribution network series and parallel power electronic converter interconnection control device which comprises an interconnection control system, a series converter module and a parallel converter module, wherein the interconnection control system comprises a series converter control module, a parallel converter control module and a central processing unit, the central processing unit is connected with the series converter module through the series converter control module, and the central processing unit is connected with the parallel converter module through the parallel converter control module. The utility model effectively improves the power grid regulation capability.
Description
Technical Field
The utility model belongs to the technical field of power grid control, and particularly relates to a power distribution network series and parallel power electronic converter interconnection control device.
Background
With the continuous popularization of new energy power generation and the continuous promotion of flexible smart grid construction, the application of the power electronic converter in the power grid is increasingly wide. The power electronic converters are classified into a series power electronic converter (abbreviated as a series converter) and a parallel power electronic converter (abbreviated as a parallel converter) according to a structure mode of connecting the power electronic converters to a power grid. The series power electronic converter mainly injects voltage with adjustable amplitude and phase to the feeder line and has strong voltage adjusting capacity, and the parallel power electronic converter mainly injects current with adjustable amplitude and phase to the feeder line and has strong current adjusting capacity. The two converters have obvious advantages and complement each other, so that the unified power quality regulator simultaneously comprising the series-connection type converter and the parallel-connection type converter can play an important role in the aspects of improving the power grid regulation capability, improving the power quality and the like by virtue of the strong voltage and current regulation capability of the unified power quality regulator.
Although the existing unified power quality regulator has strong functions, the series-parallel converters share a direct current side, the coupling degree is high, and meanwhile, the existing unified power quality regulator comprises two sets of converters in series connection and parallel connection, so that the manufacturing cost is too high, and the existing unified power quality regulator is difficult to popularize and apply in a power grid on a large scale.
On the other hand, there is a current situation in current distribution network: a plurality of independent series converters and parallel converters are distributed in a distributed manner, but the converters with single structures are often not high in utilization efficiency and not flexible in working state due to the reasons that the designed capacity is excessive, the converters only work effectively in a power grid fault state and the like. In view of the fact that a large number of series type or parallel type converters with a single structure are distributed in a power grid at present, if the converters can be connected to establish an interconnection control system, a unified power quality regulator with stronger performance is equivalently constructed. Meanwhile, the direct current sides of the converters under the interconnection control system are mutually independent and are not coupled with each other, so that compared with the traditional unified power quality regulator, the series converters and the parallel converters under the interconnection control system are more flexible and comprehensive in control and response. Therefore, the interconnection control system can not only obviously improve the utilization efficiency of each converter, but also release the adjusting capacity of each converter, effectively broaden the working range of the converters and improve the coping capacity of the interconnection control system to complex operating conditions.
Therefore, there is a need for a power distribution network interconnection control device for series and parallel power electronic converters to solve the above-mentioned problems.
SUMMERY OF THE UTILITY MODEL
In order to avoid the defects of the prior art, the utility model provides an interconnection control device for series-type and parallel-type power electronic converters of a power distribution network, which is used for carrying out interconnection control on independent series-type and parallel-type power electronic converters in the power distribution network, better exerting the working potential and performance of each independent converter in the existing power distribution network, responding to more complex working conditions, providing high-quality electric energy service and obviously improving the utilization rate of equipment.
In particular, the utility model provides an interconnection control device for series-connection type and parallel-connection type power electronic converters of a power distribution network, which comprises an interconnection control system, a series-connection conversion module and a parallel-connection conversion module, wherein,
the interconnection control system comprises a series type converter control module, a parallel type converter control module and a central processing unit, wherein the central processing unit is connected with the series type converter control module through the series type converter control module, and the central processing unit is connected with the parallel type converter control module through the parallel type converter control module.
Furthermore, the interconnection control system also comprises a serial data acquisition processing module and a parallel data acquisition processing module, wherein,
the serial conversion module is also connected with the central processing unit through the serial data acquisition processing module;
the parallel conversion module is also connected with the central processing unit through a parallel data acquisition processing module.
Further, the series conversion module comprises a series converter and a series controller, the series converter being connected with the series controller, wherein,
the central processing unit is connected with the series controller through the series converter control module;
the series type converter is connected with the series data acquisition and processing module.
Further, the parallel conversion module includes a parallel type converter and a parallel controller, the parallel type converter is connected with the parallel controller, wherein,
the central processing unit is connected with the parallel controller through a parallel converter control module;
the parallel type converter is connected with the parallel data acquisition and processing module.
Further, the serial data acquisition processing module comprises a serial data acquisition module and a serial data processing module, wherein,
the serial data acquisition module is connected with the serial data processing module;
the serial data processing module is connected with the central processing unit;
the series type converter is connected with the series data acquisition module.
Further, the parallel data acquisition processing module comprises a parallel data acquisition module and a parallel data processing module, wherein,
the parallel data acquisition module is connected with the parallel data processing module;
the parallel data processing module is connected with the central processing unit;
the parallel type converter is connected with the parallel data acquisition module.
Further, the interconnection control system also comprises an intelligent algorithm module, wherein,
the intelligent algorithm module is connected with the central processing unit.
Further, the interconnection control system also comprises a fault identification and early warning module, wherein,
and the fault identification and early warning module is connected with the central processing unit.
The utility model has the beneficial effects that:
the interconnection control device for the series-connection type and parallel-connection type power electronic converters of the power distribution network, provided by the utility model, can effectively improve the utilization rate of a large number of dispersedly distributed converters in the existing power distribution network, excavate and exert the working potential and performance of each independent converter, and provide high-quality electric energy service in response to more complex working conditions. Because the direct current sides of the converters under the interconnection control system are mutually independent and are not coupled with each other, compared with the traditional unified power quality regulator, the series-connection and parallel-connection type power electronic converters under the control of the interconnection control system are more flexible and comprehensive in control and response.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a schematic overall structure of an apparatus according to an embodiment of the present invention.
Fig. 2 shows a detailed structural diagram of the device according to the embodiment of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1 to fig. 2, the utility model provides an interconnection control device for series-type and parallel-type power electronic converters of a power distribution network, which comprises an interconnection control system, a series conversion module and a parallel conversion module, wherein,
the interconnection control system comprises a series type converter control module, a parallel type converter control module, a central processing unit, a series data acquisition processing module and a parallel data acquisition processing module, wherein,
the central processing unit is connected with the series conversion module through the series converter control module, and the central processing unit is connected with the parallel conversion module through the parallel converter control module.
The serial conversion module is also connected with the central processing unit through the serial data acquisition processing module;
the parallel conversion module is also connected with the central processing unit through the parallel data acquisition processing module.
A detailed description is provided below.
As for the series conversion module, specifically, the series conversion module includes a series type converter and a series controller, the series type converter being connected with the series controller, wherein,
the central processing unit is connected with the series controller through the series converter control module;
the series converter is connected with the series data acquisition processing module.
As for the parallel conversion module, specifically, the parallel conversion module includes a parallel converter and a parallel controller, the parallel converter is connected with the parallel controller, wherein,
the central processing unit is connected with the parallel controller through a parallel converter control module;
the parallel type converter is connected with the parallel data acquisition and processing module.
As for the serial data acquisition processing module, specifically, the serial data acquisition processing module includes a serial data acquisition module and a serial data processing module, wherein,
the serial data acquisition module is connected with the serial data processing module;
the serial data processing module is connected with the central processing unit;
the series type converter is connected with the series data acquisition module.
As for the parallel data acquisition processing module, specifically, the parallel data acquisition processing module includes a parallel data acquisition module and a parallel data processing module, wherein,
the parallel data acquisition module is connected with the parallel data processing module;
the parallel data processing module is connected with the central processing unit;
the parallel type converter is connected with the parallel data acquisition module.
In addition, the interconnection control system also comprises an intelligent algorithm module and a fault identification and early warning module, wherein,
the intelligent algorithm module is connected with the central processing unit;
the fault identification and early warning module is connected with the central processing unit.
The operation principle of each part is explained below.
The series converter is used for acquiring power grid information (voltage signals and current signals) of a feeder line where the converter is located and injecting voltage into the feeder line where the converter is located, and further achieving a voltage regulation function; the parallel converter is used for collecting power grid information (voltage signals and current signals) of a power grid of the feeder line and injecting current into the feeder line, and therefore the function of current regulation is achieved.
For the power grid information of the feeder line where the series type converter is collected, the following processes are as follows:
the series data acquisition module is used for acquiring the power grid information of the feeder line;
the series data processing module is used for preprocessing the power grid information acquired by the series data acquisition module, wherein the preprocessing comprises the following steps: filtering the power grid information, and then performing calculation analysis on indexes such as power grid voltage sag degree, current harmonic content and the like according to the filtered power grid information so as to obtain a data result about the power grid information after calculation analysis;
the central processing unit judges the data result obtained after the preprocessing and analyzes whether data abnormity occurs or not;
if the data is abnormal, the fault recognition and early warning module can immediately respond to prompt operation and maintenance personnel to check the interconnected control system, and the fault is solved in an automatic or manual mode. If the data is abnormal, the data in the whole process is transmitted to the intelligent algorithm module, and the intelligent algorithm module calculates to give an optimal control strategy (namely, the series converter is controlled to output the injection voltage with specific magnitude and phase);
after the optimal control strategy of the intelligent algorithm system is processed by the central processing unit, a control instruction is generated and sent to the control module of the series converter;
the main circuit of the series controller receives a control instruction sent by the control module of the series converter, and then controls the series converter to operate according to the control instruction (namely the series converter modulates and generates injection voltage according with expectation, and the injection voltage is coupled to a feeder line where the series converter is located, so that the voltage regulation function can be realized);
and then, acquiring the real-time power grid information of the power grid of the feeder line in the next round to obtain the optimal control scheme of the next round, and operating according to the control instruction.
For the power grid information of the power grid of the feeder line where the parallel type converter is located, the following processes can refer to the above processes.
An optimal control strategy for two control commands (a control command for the series converter to operate and a control command for the parallel converter to operate) includes:
1) when the voltage and the current of the power grid (the power grid of the feeder line where the power grid is located) are both in a normal state, the series type converter and the parallel type converter are controlled to cooperate with each other, the power (the power of the series converter and the power of the parallel converter) is cooperatively controlled, and more generated power of new energy is used in a grid-connected mode.
2) When the voltage of a power grid has a temporary drop or temporary rise problem and the current of the power grid is normal, the series converter is controlled to compensate the voltage problem, redundant capacity (the redundant capacity comprises active power and reactive power, when the voltage compensation is carried out on the series converter, a part of active power and reactive power can be output, and the rest power is called redundant capacity) of the series converter can be cooperatively matched with the parallel converter to carry out power regulation.
3) When the voltage of a power grid is normal, the current of the power grid has the problems of harmonic wave, too low power factor and the like, the parallel type converter is controlled to solve the problems of current harmonic wave and too high reactive current, and the redundant capacity of the parallel type converter can be cooperatively matched with the series type converter to regulate and control the power.
4) When the voltage and the current of the power grid simultaneously have problems, the series type converter is controlled to compensate the voltage problem, the parallel type converter solves the current problem, and redundant capacities of the two converters are cooperatively matched to regulate and control the power.
Therefore, the utilization efficiency and the utilization degree of the two converters which are originally distributed dispersedly are effectively improved, and better electric energy service can be provided for the power grid.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (8)
1. An interconnection control device of series-connection type and parallel-connection type power electronic converters of a power distribution network is characterized by comprising an interconnection control system, a series-connection conversion module and a parallel-connection conversion module, wherein,
the interconnection control system comprises a series type converter control module, a parallel type converter control module and a central processing unit, wherein the central processing unit is connected with the series type converter control module through the series type converter control module, and the central processing unit is connected with the parallel type converter control module through the parallel type converter control module.
2. The interconnection control device of series-connected and parallel-connected power electronic converters of a power distribution network according to claim 1, wherein the interconnection control system further comprises a series data acquisition and processing module and a parallel data acquisition and processing module, wherein,
the serial conversion module is also connected with the central processing unit through the serial data acquisition processing module;
the parallel conversion module is also connected with the central processing unit through a parallel data acquisition processing module.
3. A power distribution network series and parallel power electronic converter interconnection control device according to claim 2, wherein the series conversion module comprises a series converter and a series controller, the series converter is connected with the series controller, wherein,
the central processing unit is connected with the series controller through the series converter control module;
the series converter is connected with the series data acquisition and processing module.
4. The interconnection control device for series-type and parallel-type power electronic converters of a power distribution network according to claim 2, wherein the parallel conversion module comprises a parallel-type converter and a parallel controller, the parallel-type converter is connected with the parallel controller, wherein,
the central processing unit is connected with the parallel controller through a parallel converter control module;
the parallel converter is connected with the parallel data acquisition and processing module.
5. The interconnection control device of series-connected and parallel-connected power electronic converters of a power distribution network according to claim 3, wherein the series data acquisition and processing module comprises a series data acquisition module and a series data processing module,
the serial data acquisition module is connected with the serial data processing module;
the serial data processing module is connected with the central processing unit;
the series converter is connected with the series data acquisition module.
6. The interconnection control device of series-connected and parallel-connected power electronic converters of a power distribution network according to claim 4, wherein the parallel data acquisition and processing module comprises a parallel data acquisition module and a parallel data processing module,
the parallel data acquisition module is connected with the parallel data processing module;
the parallel data processing module is connected with the central processing unit;
the parallel type converter is connected with the parallel data acquisition module.
7. The interconnection control device for series-connection and parallel-connection type power electronic converters of a power distribution network according to any one of claims 1 to 6, wherein the interconnection control system further comprises an intelligent algorithm module, wherein,
the intelligent algorithm module is connected with the central processing unit.
8. The interconnection control device of series-connected and parallel-connected power electronic converters of a power distribution network according to any one of claims 1 to 6, wherein the interconnection control system further comprises a fault recognition and early warning module, wherein,
and the fault identification and early warning module is connected with the central processing unit.
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