Hybrid compensation cabinet integrating SVG and APF

Abstract

A hybrid compensation cabinet integrating SVG and APF comprises a cabinet body, a circuit system is arranged in the cabinet body and comprises a circuit breaker QF, one end of the circuit breaker QF is connected with commercial power, and the other end of the circuit breaker QF is connected with a plurality of APF modules and SVG modules; the control end of the filtering compensation controller LSVG is connected with the APF module and the signal receiving end of the SVG module, the APF module and the SVG module are integrated, continuous reactive power regulation from inductive to capacitive is achieved, and the requirement of the system for reactive power is rapidly compensated.

Description

Technical Field

[0001] The present invention relates to the field of compensation cabinets, and in particular, to a hybrid compensation cabinet integrating SVG and APF. Background Art

[0002] At present, the power grid reactive power compensation schemes include: one is capacitor compensation, one is SVG reactive power compensation, and one is APF filtering compensation. All of the above are single compensation schemes, with single compensation effect and poor comprehensiveness. Summary of the Invention

[0003] To solve the above problems, the present technical solution provides a hybrid compensation cabinet integrating SVG and APF, which combines the functions of a static var generator (SVG) and an active power filter (APF) in a modular switch cabinet to achieve comprehensive compensation for the power system.

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

[0005] A hybrid compensation cabinet integrating SVG and APF includes a cabinet body, in which a circuit system is provided, including a circuit breaker QF. One end of the circuit breaker QF is connected to the mains power, and the other end is connected to a plurality of APF modules and SVG modules;

[0006] It further includes a filtering compensation controller LSVG, whose control end is connected to the signal receiving ends of the APF modules and SVG modules.

[0007] In some embodiments, a plurality of current acquisition ends are provided in both the APF modules and SVG modules, and each current acquisition end corresponds to a current transformer TA.

[0008] In some embodiments, a travel switch XK is connected between the two endpoints of the current acquisition end.

[0009] In some embodiments, the communication end of the filtering compensation controller LSVG communicates with a switch through an RJ45 network cable.

[0010] In some embodiments, the voltage end of the filtering compensation controller LSVG is connected to a DC module DY, and the DC module DY receives the mains power.

[0011] The beneficial effects of the present application are as follows:

[0012] The present application integrates APF modules and SVG modules, realizes continuous reactive power regulation from inductive to capacitive, and quickly compensates the system's demand for reactive power. Description of the Drawings

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments.

[0014] Figure 1 is the structural schematic of the embodiment of the present invention Figure 1 ;

[0015] Figure 2 is the structural schematic of the embodiment of the present invention Figure 2 。 Detailed implementation manners

[0016] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] Please refer to Figure 1-2 As shown, a hybrid compensation cabinet integrating SVG and APF includes a cabinet body. A circuit system is provided in the cabinet body, which includes a circuit breaker QF. One end of the circuit breaker QF is connected to the commercial power, and the other end is connected to a plurality of APF modules and SVG modules;

[0018] It further includes a filter compensation controller LSVG, whose control end is connected to the signal receiving ends of the APF module and the SVG module.

[0019] In this embodiment, a plurality of current acquisition ends are provided in both the APF module and the SVG module, and each current acquisition end corresponds to a current transformer TA.

[0020] In this embodiment, a travel switch XK is connected between the two endpoints of the current acquisition end.

[0021] In this embodiment, the communication end of the filter compensation controller LSVG communicates with a switch through an RJ45 network cable.

[0022] In this embodiment, the voltage end of the filter compensation controller LSVG is connected to a DC module DY, and the DC module DY receives the commercial power.

[0023] SVG collects the system current signal in real time through an external current transformer, constructs a self-commutated bridge circuit using turn-off power electronic devices (such as IGBTs), and is connected in parallel with the power grid through a reactor. SVG quickly absorbs or releases reactive power by accurately controlling the amplitude and phase of the output voltage to achieve dynamic reactive power compensation. The core lies in controlling the switching state of IGBTs through an inverter bridge, thereby adjusting the amplitude and phase of the DC-to-AC voltage to ensure that the system always operates at a high power factor;

[0024] The APF collects the system current signal through an external current transformer, separates the harmonic part by using an internal detection circuit, and generates a compensation current with the same magnitude and opposite phase as the system harmonic through an IGBT power converter, thereby achieving harmonic suppression. The output compensation current of the APF changes dynamically according to the system harmonic quantity, without over-compensation problems, and has an overload protection function;

[0025] After being combined into one module, the reactive power and harmonic output are simultaneously controlled by a controller. It realizes continuous reactive power regulation from inductive to capacitive by controlling the phase of the device output current, and quickly compensates the system's demand for reactive power. At the same time, it can also collect and calculate the harmonic current components in the line, and achieve the purpose of harmonic governance by adjusting the output of the three-phase bridge circuit on the AC side to generate a compensation current with the same amplitude and opposite direction as the harmonic in the power grid. This hybrid compensation cabinet can overcome the disadvantages of traditional compensators, such as slow response speed, poor compensation effect, and easy parallel resonance with the power grid, and improve the overall compensation efficiency and effect.

[0026] During implementation, a circuit breaker (QF) is installed as the main power switch in the cabinet, a set of current transformers (TA1~TA3) is installed for secondary current sampling, two APF modules and three SVG modules are installed for power filtering and reactive power compensation, and a compensation controller (LSVG-2000) is installed to control the input and output of the APF module and SVG module.

[0027] Finally, the cabinet structure of this application supports the quick plugging and unplugging of APF modules and SVG modules without power-off, which greatly facilitates maintenance and replacement; three travel switches are installed on the rear cabinet of each SVG and APF module. When the module needs to be replaced and pulled out, the travel switch will automatically close, short-circuiting the A, B, and C-phase secondary sampling current lines on the module wiring seat, which can prevent high voltage caused by current open circuit and trigger accidents; when the module is re-inserted, the travel switch will automatically open, and the current on the module can be re-connected to work. There is no need to disconnect and reconnect the wires separately.

[0028] The above are only the preferred embodiments of this application, and are not used to limit the scope of implementation of this application. Other embodiments with the same or similar principles and basic structures as this application are within the protection scope of this application.

Claims

1. A hybrid compensation cabinet integrating SVG and APF, characterized in that: It comprises a cabinet, wherein a circuit system is arranged in the cabinet, which comprises a circuit breaker QF, wherein one end of the circuit breaker QF is connected to the mains, and the other end is connected to a plurality of APF modules and an SVG module; It also includes a filter compensation controller LSVG, a control end of which is connected to the APF module and the signal receiving end of the SVG module.

2. The hybrid compensation cabinet integrating SVG and APF according to claim 1 is characterized in that: The APF module and the SVG module are both provided with a plurality of current collection terminals, each of which is connected in series in sequence, and each of the current collection terminals corresponds to a current transformer TA.

3. The hybrid compensation cabinet integrating SVG and APF according to claim 2 is characterized in that: A travel switch XK is connected between the two end points of the current collection end. The travel switch XK is arranged in the cabinet. When the APF module and the SVG module are pulled out, the travel switch XK is disconnected.

4. The hybrid compensation cabinet integrating SVG and APF according to claim 1 is characterized in that: The communication terminal of the filter compensation controller LSVG communicates with the switch via an RJ45 network cable.

5. The hybrid compensation cabinet integrating SVG and APF according to claim 1 is characterized in that: The voltage end of the filter compensation controller LSVG is connected to a DC module DY, and the DC module DY receives AC power.

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