A hybrid compensation cabinet combining SVG and APF

Abstract

A kind of hybrid compensation cabinet of SVG and APF, including cabinet, circuit system is equipped in the cabinet, it includes circuit breaker QF, one end of the circuit breaker QF is connected with commercial power, and the other end is connected with multiple APF modules and SVG module;It further includes filter compensation controller LSVG, and the signal receiving end of the APF module and SVG module is connected with the control end of the filter compensation controller LSVG, the present application is integrated with APF module and SVG module, realizes from inductive to capacitive continuous reactive power regulation, and quickly compensates the demand of system to reactive power.

Description

Technical Field

[0001] This utility model relates to the field of compensation cabinets, and more particularly to a hybrid compensation cabinet that integrates SVG and APF. Background Technology

[0002] Currently, there are three main reactive power compensation schemes for power grids: capacitor compensation, SVG reactive power compensation, and APF filter compensation. These are all individual compensation schemes with limited effectiveness and poor overall performance. Utility Model Content

[0003] To address the aforementioned issues, this technical solution provides a hybrid compensation cabinet integrating SVG and APF, combining the functions of a Static Var Generator (SVG) and an Active Power Filter (APF) in a single modular switchgear to achieve comprehensive compensation for the power system.

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

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

[0006] It also includes a filter compensation controller (LSVG), whose control terminal is connected to the signal receiving terminals of the APF module and the SVG module.

[0007] In some embodiments, both the APF module and the SVG module are provided with multiple current acquisition terminals, and each current acquisition terminal corresponds to a current transformer TA.

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

[0009] In some embodiments, the communication terminal of the filter compensation controller LSVG communicates with the switch via an RJ45 network cable.

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

[0011] The beneficial effects of this application are:

[0012] This application integrates an APF module and an SVG module to achieve continuous reactive power regulation from inductive to capacitive and quickly compensate for the system's reactive power demand. Attached Figure Description

[0013] 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.

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ;

[0015] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 . Detailed Implementation

[0016] 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.

[0017] Please refer to Figure 1-2 As shown, a hybrid compensation cabinet integrating SVG and APF includes a cabinet body, and the cabinet body is equipped with a circuit system, which includes a circuit breaker QF. One end of the circuit breaker QF is connected to the mains power, and the other end is connected to multiple APF modules and SVG modules.

[0018] It also includes a filter compensation controller (LSVG), whose control terminal is connected to the signal receiving terminals of the APF module and the SVG module.

[0019] In this embodiment, both the APF module and the SVG module are equipped with multiple current acquisition terminals, and each current acquisition terminal corresponds to a current transformer TA.

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

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

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

[0023] SVG (Variable Reactive Power) acquires system current signals in real time through an external current transformer, constructs a self-commutated bridge circuit using switchable power electronic devices (such as IGBTs), and connects to the grid in parallel through a reactor. SVG achieves dynamic reactive power compensation by precisely controlling the amplitude and phase of the output voltage, rapidly absorbing or releasing reactive power. Its core lies in controlling the switching state of the IGBTs through the inverter bridge, thereby adjusting the amplitude and phase of the DC-to-AC voltage to ensure the system always maintains a high power factor.

[0024] An APF (Automatic Power Supply) acquires the system current signal through an external current transformer, separates the harmonic components using internal detection circuitry, and generates a compensation current with the same magnitude but opposite phase to the system harmonics via an IGBT power converter, thereby achieving harmonic suppression. The APF's output compensation current dynamically changes according to the system harmonic quantity, preventing overcompensation and providing overload protection.

[0025] Integrated into a single module, this system simultaneously controls reactive power and harmonic output via a single controller. By controlling the phase of the output current, it achieves continuous reactive power regulation from inductive to capacitive, rapidly compensating for the system's reactive power demands. Simultaneously, it can collect and calculate harmonic current components in the line, achieving harmonic mitigation by adjusting the AC output of the three-phase bridge circuit to produce a compensation current with equal amplitude but opposite direction to the harmonics in the grid. This hybrid compensation cabinet overcomes the shortcomings of traditional compensators, such as slow response speed, poor compensation effect, and susceptibility to parallel resonance with the grid, thus improving overall compensation efficiency and effectiveness.

[0026] During implementation, a circuit breaker (QF) is installed as the main power switch in the cabinet, a set of current transformers (TA1~TA3) are 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 connection and disconnection of the APF modules and SVG modules.

[0027] Ultimately, the cabinet structure of this application supports quick insertion and removal of APF and SVG modules without power interruption, greatly facilitating maintenance and replacement. Each SVG and APF module has three limit switches installed on the rear cabinet. When a module needs to be removed for replacement, the limit switches automatically close, short-circuiting the A, B, and C phase secondary sampling current lines on the module's terminal block to prevent high voltage and accidents caused by open current. When the module is reinserted, the limit switches automatically open, allowing current to resume operation. No additional wiring disconnection is required.

[0028] 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 hybrid compensation cabinet integrating SVG and APF, characterized in that, The system includes a cabinet, which contains an electrical system 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 multiple APF modules and an SVG module. It also includes a filter compensation controller (LSVG), whose control terminal is connected to the signal receiving terminals of the APF module and the SVG module; Both the APF module and the SVG module are equipped with multiple current acquisition terminals, each current acquisition terminal is connected in series, and each current acquisition terminal corresponds to a current transformer TA. A limit switch XK is connected between the two endpoints of the current acquisition terminal. The limit switch XK is installed inside the cabinet. When the APF module and SVG module are pulled out, the limit switch XK is closed. The communication terminal of the LSVG (Low Var Generator Filter) communicates with the switch via an RJ45 network cable. The voltage terminal of the LSVG filter compensation controller is connected to a DC module DY, which receives mains power.

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