Stepping type two-path active filtering control cabinet system

Abstract

A stepping type two-path active filtering control cabinet system comprises sampling current transformers 2TAa, 2TAb and 2TAc arranged in a capacitance compensation cabinet and sampling current transformers 1TAa, 1TAb and 1TAc arranged in an active filtering cabinet, and further comprises a plurality of active filtering modules connected in sequence, one end of each active filtering module is connected with the sampling current transformers 2TAa, 2TAb and 2TAc, and the other end of each active filtering module is connected with the sampling current transformers 1TAa, 1TAb and 1TAc. The other ends of the sampling current transformers 1TAa, 1TAb and 1TAc are connected with the sampling current transformers 1TAa, 1TAb and 1TAc; the system further comprises a centralized monitoring screen JKQ, and the signal acquisition end of the centralized monitoring screen JKQ is connected with the active filtering module. According to the application, current sampling is carried out on two paths of loads existing in a line, so that the active filtering module collects sampling current information; the centralized monitoring screen is used for performing centralized monitoring on the plurality of active filtering modules in the cabinet, thereby realizing step-by-step improvement of the electric energy quality of the line, improving the power supply reliability and protecting the equipment.

Description

Technical Field

[0001] This utility model relates to the field of active filter cabinets, and more particularly to a step-type two-way active filter control cabinet system. Background Technology

[0002] Active power filter cabinets in power distribution rooms are mainly used to improve power quality, eliminate harmonics in the power grid, reduce harmonic interference to equipment, and dynamically compensate reactive power to improve the power factor and reduce line losses. Currently, active power filter cabinets installed in power distribution rooms are generally placed close to the load side, with the sampling current transformer installed at the load-side panel. These common solutions are designed for a single load. Active power filter control cabinets designed for a single load are not conducive to harmonic mitigation and reactive power compensation under two load conditions. Furthermore, when the rated current of the active power filter modules in the cabinet is the same, it is impossible to achieve more precise and efficient control of the line to improve power quality. For example, in an active power filter control cabinet, both active power filter modules have a rated current of 100A, or both have a rated current of 200A. Utility Model Content

[0003] To address the aforementioned issues, this technical solution provides a step-type two-way active filter control cabinet system.

[0004] To achieve the above objectives, the technical solution is as follows:

[0005] A step-type two-way active filter control cabinet system includes sampling current transformers 2TAa, 2TAb, and 2TAc installed in a capacitor compensation cabinet, and sampling current transformers 1TAa, 1TAb, and 1TAc installed in an active filter cabinet. It also includes multiple active filter modules connected in sequence. One end of each active filter module is connected to the sampling current transformers 2TAa, 2TAb, and 2TAc, and the other end is connected to the sampling current transformers 1TAa, 1TAb, and 1TAc.

[0006] It also includes a centralized monitoring screen JKQ, whose signal acquisition terminal is connected to the active filtering module.

[0007] In some embodiments, a busbar connected to sampling current transformers 2TAa, 2TAb and 2TAc for supplying power to the load is also included. The busbar is connected to the upper contact of a circuit breaker, and the lower contact of the circuit breaker is connected to a step-down transformer.

[0008] In some embodiments, the busbar is connected to a fuse via a disconnecting switch, the fuse is grounded via a surge arrester, and the fuse is also connected to the active filter module.

[0009] The beneficial effects of this application are:

[0010] This application performs current sampling on two loads in the line, enabling the active filter module to collect the sampled current information. A centralized monitoring screen is used to centrally monitor multiple active filter modules in the cabinet, thereby improving the power quality of the line in a step-by-step manner and enhancing the power supply reliability protection equipment. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ;

[0013] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 ;

[0014] Figure 3 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 3 . Detailed Implementation

[0015] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0016] Please refer to Figure 1-3 As shown, a step-type two-way active filter control cabinet system includes sampling current transformers 2TAa, 2TAb, and 2TAc installed in a capacitor compensation cabinet, and sampling current transformers 1TAa, 1TAb, and 1TAc installed in an active filter cabinet. It also includes multiple active filter modules connected in sequence. One end of each active filter module is connected to the sampling current transformers 2TAa, 2TAb, and 2TAc, and the other end is connected to the sampling current transformers 1TAa, 1TAb, and 1TAc.

[0017] It also includes a centralized monitoring screen JKQ, whose signal acquisition terminal is connected to the active filtering module.

[0018] After flowing into the control cabinet, the electricity is directed to the load terminals on both sides. One side is equipped with a capacitor compensation cabinet to compensate for reactive power in the circuit, and a sampling current transformer is installed on the main busbar near the load side. The other side is equipped with a source filter cabinet to control harmonics generated in the circuit, compensate for reactive power, and improve the power factor of the line. A sampling current transformer is also installed on the main busbar near the load side.

[0019] The current information of the two load sides is sampled by the current transformer. The active filter module receives the information and then controls the operation of the active filter module through the centralized monitoring screen in the active filter cabinet so as to put the active filter module into use according to the actual line current.

[0020] Of these, 1-4M are active filter modules, and 1TAa-c and 2TAa-c are sampling current transformers. Both sets of current transformers are connected to the active filter modules to form current loops. JKQ is the centralized monitoring panel in the APF cabinet. The power supply for the centralized monitoring panel is taken from the incoming side of the main switch inside the cabinet, and connected to the power terminal after protection by a FU1 fuse. The centralized monitoring panel has communication capabilities, enabling it to connect its own information to the backend and to control the operation of the active filter modules via a double-core shielded cable.

[0021] For a power distribution system with two loads, a set of sampling current transformers is installed on the main busbars of both the capacitor compensation cabinet and the active filter cabinet near the load side to sample the load current. These two sets of current transformers then form current loops with the active filter modules in the active filter cabinet. Unlike previous schemes where the rated current of the active filter modules was kept constant, different rated current values ​​are selected to suit the actual load operation of the power distribution system. When the entire load in the power distribution system requires a 300A rated current active filter module, a high-efficiency configuration is selected, using one 25A rated current active filter module, one 50A rated current active filter module, one 75A rated current active filter module, and one 150A rated current active filter module. All active filter modules in operation can meet the needs of the power distribution system. Furthermore, when the load in the power distribution system is not operating at full load, the most efficient module operation scheme can be selected to avoid the risk of overcompensation, reduce operating costs, and improve the operating efficiency of the active filter modules. The centralized monitoring panel in the active power filter cabinet has communication terminals that connect to the backend system for monitoring. It connects to multiple active power filter modules within the cabinet via a double-core shielded cable. When a portion of the load in the power distribution system requires a 100A active power filter module for power quality improvement, the centralized monitoring panel can selectively activate the most suitable module based on the actual needs of the line. In this case, only the 25A and 75A rated active power filter modules need to be activated. These four active power filter modules with different rated currents can be activated in steps from 25A to 300A, enabling more precise and efficient improvement of the line's power quality.

[0022] In this embodiment, a busbar connected to the sampling current transformers 2TAa, 2TAb and 2TAc for supplying power to the load is also included. The busbar is connected to the upper contact of the circuit breaker and the lower contact of the circuit breaker is connected to the step-down transformer.

[0023] In this embodiment, the busbar is connected to a fuse via a disconnecting switch, the fuse is grounded via a surge arrester, and the fuse is also connected to the active filter module.

[0024] The above description is only a preferred embodiment of this application and is not intended to limit the scope of implementation of this application. Any other embodiments whose principles and basic structures are the same as or similar to those of this application are within the protection scope of this application.

Claims

1. A stepper-type two-way active filter control cabinet system, characterized in that, It includes sampling current transformers 2TAa, 2TAb, and 2TAc installed in a capacitor compensation cabinet, and sampling current transformers 1TAa, 1TAb, and 1TAc installed in an active filter cabinet. It also includes multiple active filter modules connected in sequence. One end of each active filter module is connected to the sampling current transformers 2TAa, 2TAb, and 2TAc, and the other end is connected to the sampling current transformers 1TAa, 1TAb, and 1TAc. It also includes a centralized monitoring screen JKQ, whose signal acquisition terminal is connected to the active filtering module.

2. The step-type two-way active filter control cabinet system according to claim 1, characterized in that: It also includes a busbar connected to sampling current transformers 2TAa, 2TAb and 2TAc for supplying power to the load, the busbar being connected to the upper contact of the circuit breaker and the lower contact of the circuit breaker being connected to the step-down transformer.

3. The step-type two-way active filter control cabinet system according to claim 2, characterized in that: The busbar is connected to a fuse via a disconnecting switch, the fuse is grounded via a surge arrester, and the fuse is also connected to the active filter module.

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