An intelligent frequency drop generator

Abstract

The present invention relates to an intelligent frequency drop generator, which is used to realize short-term interruption or temporary drop of voltage between phase lines, and includes an input selection module, an electric voltage regulator, a controller, a first rectifier module, a second rectifier module, a first output selection module, and a second output selection module. The first input end of the primary side of the electric voltage regulator is connected to the output end of the input selection module, the second input end of the primary side and the second input end of the secondary side are connected to the second output selection module, the first input end of the secondary side is connected to the first output selection module through the second rectifier module, the output end of the input selection module is also connected to the first output selection module through the first rectifier module, and the first output selection module and the second output selection module are respectively connected to the output end of the frequency drop generator. Compared with the prior art, the present invention has the advantages of switchable selection between phase lines and between phase line and neutral line, safe, stable and reliable, low cost, simple structure, etc.

Description

Technical Field

[0001] The invention relates to the field of voltage detection, and in particular to an intelligent frequency drop generator. Background Art

[0002] With the development of economy, high-tech equipment that is very sensitive to voltage changes has been widely used. Voltage sag or short-term power interruption often causes abnormal operation of equipment or even shutdown accidents. Voltage sag and short-term interruption have become one of the most important dynamic power quality issues. When calculating system reliability, the impact of voltage sag should be taken into account to establish a scientific and reasonable distribution system reliability assessment system that can reflect the interests of both power suppliers and users.

[0003] like Figure 1 As shown, the existing frequency drop generator can only achieve a short-term interruption or temporary drop in voltage between the phase line and the neutral line; with the development of the electronics industry, the requirements for voltage sag or short-term power supply interruption are more comprehensive, so it is necessary to include the short-term interruption or temporary drop in voltage between phase lines, but the current frequency drop generator cannot meet the demand. Summary of the invention

[0004] The purpose of the present invention is to provide an intelligent frequency drop generator in order to overcome the defects of the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An intelligent frequency drop generator is used to achieve short-term interruption or temporary reduction of phase-to-phase voltage. The frequency drop generator includes an input selection module, an electric voltage regulator, a controller, a first rectifier module, a second rectifier module, a first output selection module and a second output selection module respectively connected to three phase input terminals and a neutral input terminal. The first input terminal of the primary side of the electric voltage regulator is connected to the output terminal of the input selection module, the second input terminal of the primary side and the second input terminal of the secondary side are commonly connected to the second output selection module, the first input terminal of the secondary side is connected to the first output selection module through the second rectifier module, the output terminal of the input selection module is also connected to the first output selection module through the first rectifier module, the first output selection module and the second output selection module are respectively connected to the output terminals of the frequency drop generator, and the output terminals of the frequency drop generator respectively include an L1 phase output terminal, an L2 phase output terminal, an L3 phase output terminal and a neutral output terminal.

[0007] The input selection module includes an L1 phase selection unit connected to the L1 phase input terminal, an L2 phase selection unit connected to the L2 phase input terminal, and an L3 phase selection unit connected to the L3 phase input terminal, and the neutral line output terminal is directly connected to the neutral line input terminal.

[0008] The L1 phase selection unit, the L2 phase selection unit and the L3 phase selection unit have the same structure, and all include an input selection contactor and an input selection IGBT which are connected in parallel and have opposite switching states. The input selection contactor is directly connected to the output end of the frequency drop generator, and the input selection IGBT is respectively connected to the input end of the first rectifier module and the first input end of the primary side of the electric voltage regulator.

[0009] The first output selection module includes three first output contactors respectively, the common input end of the three first output contactors is respectively connected to the output end of the first rectifier module and the second rectifier module, and the output end of each first output contactor is respectively connected to the corresponding L1 phase output end, L2 phase output end and L3 phase output end.

[0010] The second output selection module includes four second output contactors, a common input end of the four second output contactors is connected to the second input end of the primary side and the second input end of the secondary side of the electric voltage regulator, and an output end of each second output contactor is respectively connected to the corresponding L1 phase output end, L2 phase output end, L3 phase output end and neutral line output end.

[0011] The model of the electric voltage regulator is TEDZ-30KVA single-phase column voltage regulator.

[0012] The model of the input selection contactor, the first output contactor and the second output contactor is S-T35, and the model of the input selection IGBT is GA200LS60U.

[0013] The first rectifier module and the second rectifier module are both full-wave rectifier bridges, and their model is MDC160A1600V.

[0014] The input selection contactor, the first output contactor, the second output contactor and the input selection IGBT are all connected to a controller, and the model of the controller is MPC89E515AP.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The present invention transforms the original three electric voltage regulators into one, and the phase line or the neutral line entering the voltage regulator can be switched between phase line and phase line or between phase line and neutral line at will by controlling the on-off of the contactor and the IGBT through a single chip controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a block diagram of an existing frequency drop generator.

[0018] Figure 2 The figure is a block diagram of an intelligent frequency drop generator of the present invention. DETAILED DESCRIPTION

[0019] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example

[0021] like Figure 2 As shown, an intelligent frequency drop generator is used to achieve short-term interruption or temporary reduction of phase-to-phase voltage. The frequency drop generator includes an input selection module respectively connected to three phase line input terminals and a neutral line input terminal Nin, an electric voltage regulator T1, a controller, a first rectifier module D1, a second rectifier module D2, a first output selection module and a second output selection module. The first input terminal of the primary side of the electric voltage regulator T1 is connected to the output terminal of the input selection module, the second input terminal of the primary side and the second input terminal of the secondary side are commonly connected to the second output selection module, the first input terminal of the secondary side is connected to the first output selection module through the second rectifier module D2, the output terminal of the input selection module is also connected to the first output selection module through the first rectifier module D1, the first output selection module and the second output selection module are respectively connected to the output terminals of the frequency drop generator, and the output terminals of the frequency drop generator respectively include an L1 phase output terminal L1out, an L2 phase output terminal L2out, an L3 phase output terminal L3out and a neutral line output terminal Nout.

[0022] The input selection module includes an L1 phase selection unit connected to the L1 phase input terminal L1in, an L2 phase selection unit connected to the L2 phase input terminal L2in, and an L3 phase selection unit connected to the L3 phase input terminal L3in. The neutral line output terminal Nout is directly connected to the neutral line input terminal Nin.

[0023] The L1 phase selection unit, the L2 phase selection unit and the L3 phase selection unit have the same structure, and all include input selection contactors S1, S2, S3 and input selection IGBTs 11, S12, S13 which are connected in parallel and have opposite switching states. The input selection contactor is directly connected to the output end of the frequency drop generator, and the input selection IGBT is respectively connected to the input end of the first rectifier module D1 and the first input end of the primary side of the electric voltage regulator T1.

[0024] The first output selection module includes three first output contactors S8, S9, and S10, respectively. The common input end of the three first output contactors is respectively connected to the output end of the first rectifier module D1 and the second rectifier module D2, and the output end of each first output contactor is respectively connected to the corresponding L1 phase output end L1out, L2 phase output end L2out, and L3 phase output end L3out.

[0025] The second output selection module includes four second output contactors, and the common input end of the four second output contactors S4, S5, S6, and S7 is connected to the second input end of the primary side and the second input end of the secondary side of the electric voltage regulator T1, and the output end of each second output contactor is respectively connected to the corresponding L1 phase output end L1out, L2 phase output end L2out, L3 phase output end L3out and neutral line output end Nout.

[0026] In this example, the model of the electric voltage regulator T1 is TEDZ-30KVA single-phase column voltage regulator.

[0027] The model of the input selection contactor, the first output contactor and the second output contactor is S-T35, and the model of the input selection IGBT is GA200LS60U.

[0028] The first rectifier module D1 and the second rectifier module D2 are both full-wave rectifier bridges, and their model is MDC160A1600V, and they are also provided with IGBTs (S14, S15) for protecting the rectifier bridge and regulating.

[0029] The input selection contactor, the first output contactor, the second output contactor and the input selection IGBT are all connected to the controller, and the model of the controller is MPC89E515AP.

[0030] The working principle of the present invention is as follows:

[0031] Contactors S11 (in the same state as S8), S12 (in the same state as S9), and S13 (in the same state as S10) are used to select one of the phases L1, L2, and L3 to be connected to one end of the primary side of the voltage regulator T1, and contactors S4, S5, S6, and S7 are used to select L1, L2, L3, and N to be connected to the other end; the input and output voltages of the voltage regulator are then switched back and forth by D1, D2 and IGBT S14 and S15, and the output is determined by contactors S8 (in the same state as S11), S9 (in the same state as S12), and S10 (in the same state as S13), and the states of S1 and S11 are opposite, the states of S2 and S12 are opposite, and the states of S3 and S13 are opposite. All contactors and IGBTs are controlled by the controller MPC89E515AP.

Claims

1. An intelligent frequency drop generator, used to achieve short-term interruption or temporary drop of phase-to-phase voltage, characterized in that: The frequency drop generator comprises an input selection module respectively connected to three phase line input ends and one neutral line input end (Nin), an electric voltage regulator (T1), a controller, a first rectifier module (D1), a second rectifier module (D2), a first output selection module and a second output selection module. The first input end of the primary side of the electric voltage regulator (T1) is connected to the output end of the input selection module, the second input end of the primary side and the second input end of the secondary side are commonly connected to the second output selection module, the first input end of the secondary side is connected to the first output selection module through the second rectifier module (D2), the output end of the input selection module is also connected to the first output selection module through the first rectifier module (D1), the first output selection module and the second output selection module are respectively connected to the output end of the frequency drop generator, and the output end of the frequency drop generator respectively comprises an L1 phase output end (L1out), an L2 phase output end (L2out), an L3 phase output end (L3out) and a neutral line output end (Nout).

2. The intelligent frequency drop generator according to claim 1, characterized in that: The input selection module includes an L1 phase selection unit connected to the L1 phase input terminal (L1in), an L2 phase selection unit connected to the L2 phase input terminal (L2in), and an L3 phase selection unit connected to the L3 phase input terminal (L3in), and the neutral line output terminal (Nout) and the neutral line input terminal (Nin) are directly connected.

3. The intelligent frequency drop generator according to claim 2, characterized in that: The L1 phase selection unit, the L2 phase selection unit and the L3 phase selection unit have the same structure and all include an input selection contactor and an input selection IGBT which are connected in parallel and have opposite switch states. The input selection contactor is directly connected to the output end of the frequency drop generator, and the input selection IGBT is respectively connected to the input end of the first rectifier module (D1) and the first input end of the primary side of the electric voltage regulator (T1).

4. The intelligent frequency drop generator according to claim 3, characterized in that: The first output selection module comprises three first output contactors respectively, the common input end of the three first output contactors is respectively connected to the output end of the first rectifier module (D1) and the second rectifier module (D2), and the output end of each first output contactor is respectively connected to the corresponding L1 phase output end (L1out), L2 phase output end (L2out) and L3 phase output end (L3out).

5. The intelligent frequency drop generator according to claim 4, characterized in that: The second output selection module comprises four second output contactors, a common input end of the four second output contactors is connected to the second input end of the primary side and the second input end of the secondary side of the electric voltage regulator (T1), and an output end of each second output contactor is respectively connected to a corresponding L1 phase output end (L1out), an L2 phase output end (L2out), an L3 phase output end (L3out) and a neutral line output end (Nout).

6. The intelligent frequency drop generator according to claim 1, characterized in that: The model of the electric voltage regulator (T1) is a TEDZ-30KVA single-phase column voltage regulator.

7. The intelligent frequency drop generator according to claim 5, characterized in that: The model of the input selection contactor, the first output contactor and the second output contactor is S-T35, and the model of the input selection IGBT is GA200LS60U.

8. The intelligent frequency drop generator according to claim 1, characterized in that: The first rectifier module (D1) and the second rectifier module (D2) are both full-wave rectifier bridges, and their models are MDC160A1600V.

9. The intelligent frequency drop generator according to claim 7, characterized in that: The input selection contactor, the first output contactor, the second output contactor and the input selection IGBT are all connected to a controller, and the model of the controller is MPC89E515AP.

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