CN204168151U - A kind of MW class is without harmonic wave reversible unsteady flow bank electricity electric supply installation - Google Patents

Abstract

The utility model discloses a megawatt-level harmonic-free reversible rectification shore power supply device, which comprises n parallel-connected double PWM conversion reversible current modules; the double PWM conversion reversible current modules include fully controlled three A half-phase AC/DC module and a fully-controlled three-phase half-bridge DC/AC module, the fully-controlled three-phase half-bridge AC/DC module is connected in series with the fully-controlled three-phase half-bridge DC/AC module; the n The n fully-controlled three-phase half-bridge AC/DC modules of the dual-PWM conversion reversible current module are respectively connected to the AC power supply through the input filter inductor; the n fully-controlled three-phase The half-bridge DC/AC modules are respectively connected to the on-grid/off-grid filter modules through output filter inductors. The grid side of the utility model adopts a PWM converter, which realizes bidirectional flow of energy, and can realize a high power factor of the grid side by controlling reactive current; multiple dual-PWM conversion reversible current modules are connected in parallel, and the system capacity can reach 3MVA, which solves the problem of mega The problem of harmonic pollution to the power grid caused by watt-level shore power.

Description

A megawatt-level harmonic-free reversible inverter shore power supply device

technical field

The utility model relates to the technical field of power electronics, in particular to a megawatt-level harmonic-free reversible current shore power topology. the

Background technique

Reversible inverter technology is a kind of inverter technology that can realize two-way flow. It is based on modern power electronics technology, modern control technology, semiconductor devices and many other disciplines. The ideal "green" inverter equipment for the new generation of reversible inverter equipment. Its appearance is based on power factor correction and elimination of converter harmonics. The power factor of the input current can be changed from -1 to +1, and the same power factor can be achieved under both rectification and inverter conditions. The research work on this technical field mainly focuses on the structure and control scheme of the converter control system for the purpose of realizing the dynamic and static indicators; the PWM modulation method for the purpose of improving the static indicators of the converter system; the topology of the main circuit Structural studies and work mode studies to improve the working conditions of main switching devices; mathematical models of converters.

For a long time, ships calling at ports have used fuel oil auxiliary engines to generate electricity by themselves, and shipyards have used variable frequency generator sets to supply power to ships. The increasingly serious problems of high energy consumption and high pollution in ports and shipyards have attracted more and more attention from port countries. The shore power system of the port can provide high-precision and reliable power supply to the ships in the port, stop the operation of the ship's diesel engine power station, and achieve the purpose of energy saving and emission reduction. It is a revolutionary progress in the field of port and ship power supply. However, the megawatt-level conversion technology of port power supply is not mature. The original inverter shore power supply equipment has a single high-power parallel module flow direction, low power factor, and great harmonic influence. the

Contents of the invention

The technical problem to be solved by the utility model is to provide a megawatt-level harmonic-free reversible current shore power supply device for the above-mentioned deficiencies in the prior art.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a megawatt-level harmonic-free reversible current shore power supply device, including n parallel-connected double PWM conversion reversible current modules; The PWM conversion reversible current module includes a fully-controlled three-phase half-bridge AC/DC module and a fully-controlled three-phase half-bridge DC/AC module, the fully-controlled three-phase half-bridge AC/DC module and the fully-controlled three-phase half-bridge The bridge DC/AC modules are connected in series; the n fully-controlled three-phase half-bridge AC/DC modules of the n double-PWM conversion reversible current modules are respectively connected to the AC power supply through the input filter inductor; the n double-PWM conversion can be The n fully-controlled three-phase half-bridge DC/AC modules of the inverter module are respectively connected to the parallel/off-grid filter modules through output filter inductors.

The on-grid/off-grid filter module includes multiple sets of parallel filters, each set of filters includes 16 parallel filters; the filter includes an electronic switch and a capacitor connected in series with the electronic switch.

Compared with the prior art, the utility model has the beneficial effects as follows: the grid side of the utility model adopts a PWM converter, which realizes bidirectional flow of energy, and can realize high power factor of the grid side by controlling reactive current; multiple dual PWM Transformation and reversible inverter modules are connected in parallel, and the system capacity can reach 3MVA, which solves the problem of harmonic pollution to the power grid caused by megawatt-level shore power; the use of compound on-grid/off-grid filter modules can meet the needs of both on-grid and off-grid applications, reducing Reactive power loss can effectively eliminate high-frequency harmonics while avoiding system oscillation.

Description of drawings

Fig. 1 is a topological structure diagram of an embodiment of the utility model;

Fig. 2 is a schematic diagram of a double PWM conversion reversible current module according to an embodiment of the present invention.

Detailed ways

As shown in Figure 1, an embodiment of the utility model includes n parallel dual-PWM conversion reversible current modules; the dual-PWM conversion reversible current modules include fully-controlled three-phase half-bridge AC/DC A three-phase half-bridge DC/AC module, the fully-controlled three-phase half-bridge AC/DC module is connected in series with the fully-controlled three-phase half-bridge DC/AC module; n of the n double PWM conversion reversible current modules The n fully-controlled three-phase half-bridge AC/DC modules are respectively connected to the AC power supply through the input filter inductor; the n fully-controlled three-phase half-bridge DC/AC modules of the n double PWM conversion reversible converter modules are respectively connected through the output filter The inductance is connected to the on/off grid filter module; the on/off grid filter module includes multiple sets of parallel filters, and each set of filters includes 16 parallel filters; the filter includes an electronic switch and the electronic Switches are connected in series, and n is an integer greater than zero.

The dual-PWM conversion reversible inverter module consists of 12 two three-phase half-bridge power electronic modules with IGBT switches as the main body. The two PWM modules respectively adopt a three-phase half-bridge topology, which can realize bidirectional current conversion function. The power of a single dual-PWM conversion reversible inverter module is 500kW, and the combination described in the utility model adopts 6 modules according to actual needs, reaching a capacity of 3MW, and a maximum of 8 modules can be connected in parallel.

The parallel/off-grid filter module connects three sets of parallel filters on the three-phase output side and the grid side, and forms a composite grid-side filter with the output filter inductor.

The power of the converter system from inputting mains power 380V/50Hz to outputting ship power 450V/60Hz from the power grid side is above the megawatt level. The mains side of the double PWM conversion reversible converter module adopts a three-phase voltage source fully-controlled rectifier. Rectification, inverting through a three-phase voltage source fully-controlled inverter. The entire reversible inverter system realizes dual PWM control.

Figure 2 is the topological diagram of the dual-PWM reversible converter module. Its AC/DC and DC/AC circuits both adopt the common three-phase voltage-type structure. The device has a faster response speed. The conversion of the system is mainly the transfer and conversion of energy. The reactance on the grid side plays the role of boosting the voltage. The utility model does not use an isolation transformer, and the normal operation of the converter requires the voltage to be raised. The active rectifier adopts a fully-controlled device, which is different from the traditional AC/DC converter that uses an uncontrollable full-bridge diode. Because the current has bidirectional flow in its main circuit, this determines that the two active rectifiers in the module can work In different states, the controllable four-quadrant current conversion of the AC and DC sides is realized. the

Claims (6)

1. MW class is without a harmonic wave reversible unsteady flow bank electricity electric supply installation, and it is characterized in that, the two PWM comprising n parallel connection convert possibility of reversal flow modules; Described couple of PWM converts possibility of reversal flow module and comprises full control three-phase half-bridge AC/DC module and full control three-phase half-bridge DC/AC module, described full control three-phase half-bridge AC/DC module and described full control three-phase half-bridge DC/AC block coupled in series; Described n two PWM converts n full control three-phase half-bridge AC/DC module of possibility of reversal flow module respectively by input filter inductance incoming transport power supply; N the full control three-phase half-bridge DC/AC module that the two PWM of described n converts possibility of reversal flow module respectively by output inductor with also/be connected from net filtration module.

2. MW class according to claim 1 is without harmonic wave reversible unsteady flow bank electricity electric supply installation, it is characterized in that, n≤8, and n be greater than zero integer.

3. MW class according to claim 2 is without harmonic wave reversible unsteady flow bank electricity electric supply installation, it is characterized in that, n=6.

4. according to the MW class one of claims 1 to 3 Suo Shu without harmonic wave reversible unsteady flow bank electricity electric supply installation, it is characterized in that, also described/to comprise many groups filter in parallel from net filtration module, often organize filter and comprise 16 filters in parallel; The electric capacity that described filter comprises electronic switch and connects with described electronic switch.

5. MW class according to claim 4 is without harmonic wave reversible unsteady flow bank electricity electric supply installation, it is characterized in that, also described/to comprise 3 groups of filters from net filtration module.

6. MW class according to claim 5 is without harmonic wave reversible unsteady flow bank electricity electric supply installation, it is characterized in that, it is 500kW that described couple of PWM converts possibility of reversal flow module power.