CN115765510A - Control method of dual-port multi-level inverter - Google Patents
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Abstract
The invention discloses a control method of a dual-port multi-level inverter. The invention can realize the real-time control of the dual-output port multi-level inverter by monitoring the input power and the output power of the dual-port converter in real time and by a special phase-locked loop mode identification method and a control switching strategy. The two output ports can independently work in a grid-connected state and an off-grid state, so that power balance and power distribution control of the multi-port power supply are realized. The control strategy can support the high-efficiency control of a high-density multi-port inverter power supply system, and is suitable for application occasions of renewable energy sources, energy storage and the like.
Description
Technical Field
The invention relates to the field of power converter control, in particular to a control method of a dual-port multi-level inverter.
Background
The inverter can realize bidirectional energy transmission and conversion between a direct-current power supply and an alternating-current load or an alternating-current power grid, and has wide application in the fields of renewable energy power generation, smart power grids, electric automobiles, aerospace and the like.
Compared with a two-level inverter, a multi-level inverter (MLI) has the advantages of low Total Harmonic Distortion (THD), modularization, high fault-tolerant capability and the like in the application of a renewable energy grid-connected system, an electric automobile, a flexible alternating-current power transmission system or other alternating-current distributed power generation systems.
The conventional inverter only comprises one direct current input port and one alternating current output port, namely, the power conversion between one direct current input source and one alternating current load or alternating current power grid can be realized. However, in power systems such as renewable energy power generation, smart grid, energy storage, etc., the inverter usually needs to have multiple output ports. The power density of the traditional multi-port output inverter is not high, the novel multi-port output inverter is input by a single power supply, independent power and voltage control are provided for two ports through two sub-circuits respectively, and how to realize the control of the multi-port inverter becomes a difficult problem.
Disclosure of Invention
The invention aims to provide a control method of a dual-port multi-level inverter, aiming at the defects of the prior control technology. The method can lead one of the dual output ports of the multi-level inverter to be grid-connected and the other to supply power to a local load. The two ports can independently distribute power and perform voltage control. The prior art can not realize the functions.
A control method of a multi-port multi-level inverter comprises a main power circuit, a grid-connected control module, an off-grid control module, a phase-locked loop module and a control mode switching module.
The output port v of the dual-port multi-level inverter o1 Grid-connected, output port v o2 Local independent loads are connected. The main power circuit includes: DC power supply (V) in ) Positive level generating sub-circuit, negative level generating sub-circuit, output port v o1 Half-bridge circuit, output port v o2 Half-bridge circuit, grid-connected filter (L) f ) (ii) a Said output port v o1 Half-bridge circuit composed of power switch tube S 1 And a power switch tube S 2 Connected in series, said output port v o2 Half-bridge circuit composed of power switch tube S 3 And power switch tube S 4 Are connected in series; the first output end of the positive level generating sub-circuit and the first output end of the negative level generating sub-circuit are connected to the positive output end of the direct current power supply, the second output end of the positive level generating sub-circuit, the second output end of the negative level generating sub-circuit and the negative output end of the direct current power supply are connected to the ground, and the power switch tube S 1 First output terminal of and the power switch tube S 3 Is connected to the third output terminal of the negative level generating sub-circuit, the power switch tube S 2 And the power switch tube S 4 Is connected to a third output terminal of the positive level generating sub-circuit, the power switching tube S 1 And the power switch tube S 2 Is connected to and forms said output port v o1 Said power switch tube S 3 And the power switch tube S 4 Is connected to and forms the output port v o2 Said output port v o1 Connecting grid-connected filter (L) f ) Rear access grid (v) g ) Said output port v o2 Local independent loads are connected.
The control circuit comprises a grid-connected control module, an off-grid control module, a phase-locked loop module and a control mode switching module; the control mode switching module controls the output signal of the grid-connected control module and the output signal of the off-grid control module through the output voltage interval judgment signal output by the phase-locked loop module.
The level number of the output alternating voltage is 2n +1, and n is a natural number which is more than or equal to 1. The phase-locked loop module converts the network voltage v g And a supply voltage V in The integral multiples of the voltage are compared, and the working process is divided into 2n output voltage intervals. The output voltage interval is defined as follows, the grid voltage v g At positive half waveWhen (n-1) V in ≤v g ≤nV in An output voltage interval Pn is defined, n is a natural number which is greater than or equal to 1, and the value of n is 1,2,3. Specifically, when n =1, 0. Ltoreq. V g ≤V in Defining an output voltage interval P1; when n =2, V in ≤v g ≤2V in The output voltage interval P2 is defined, and so on. Network voltage v g When it is a negative half wave, (n-1) V in ≤|v g |≤nV in An output voltage interval Nn is defined, n is a natural number which is more than or equal to 1, and the value of n is 1,2,3. In particular when n =1, -V in ≤v g Defining an output voltage interval N1 when the voltage is less than or equal to 0; -2V when n =2 in ≤v g ≤-V in The output voltage interval N2 is defined, and so on.
The input signal of the grid-connected control module is a real-time sampled power supply voltage V in Input current i in Voltage v of the power grid g Output port v o1 Current i of g And reactive command power Q ref And an output port v o2 Voltage v of o2 And an output port v o2 Current i of o2 The output signal of the grid-connected control module is a group of main circuit switch tube control signals G drive The specific implementation method is as follows:
the grid-connected power calculation module is used for calculating the V according to real-time sampling in 、i in 、v o2 、i o2 The network side power P is calculated by the following formula g ：
In the above formula, P g Is the grid-connected side power, P in Is the input power, P, of the DC power supply o2 Is an output port v o2 Output power of V in Is a real-time sampled DC supply voltage i in Is the input current, v, sampled in real time o2 Is an output port v for real-time sampling o2 Voltage of i o2 Is an output port v for real-time sampling o2 The current of (a);
the grid-connected control module controls the power parameter P based on a Peak Current Control (PCC) strategy g And a reactive command signal Q ref Calculating a reference current i according to the following formula ref ：
In the above formula, P g Is an output port v o1 Power of Q ref Is reactive command power, V m，g Is the peak voltage of the grid;
control signal G of main circuit power switch tube drive The specific implementation method of the power switching tube of the main driving circuit comprises the following steps: real-time comparison output port v o1 Current i of g And a reference current i ref Grid voltage v g If the current is positive half-wave and the phase-locked loop module judges that the current output voltage interval is Pn, the current i at the grid-connected side is g Is greater than or equal to the reference current i ref The PCC controller generates a main circuit power switch tube driving signal to enable the output port v o1 The output voltage level is (n-1) V in (ii) a If the grid-connected side current i g Is smaller than the reference current i ref When the PCC controller generates a main circuit power switch tube driving signal to enable an output port v o1 Output voltage level of nV in . Network voltage v g If the output voltage interval is Nn when the output voltage interval is judged to be negative half-wave and the phase-locked loop module judges that the current output voltage interval is Nn, the output port v is connected with the output voltage of the phase-locked loop module o1 Current i g Is greater than or equal to the reference current i ref The PCC controller generates a main circuit power switch tube driving signal to enable the output port v o1 Output voltage level of-nV in (ii) a If the output port v o1 Current i g Is smaller than the reference current i ref When the PCC controller generates a main circuit power switch tube driving signal to enable the output port v o1 The output voltage level is- (n-1) V in 。
The input signal of the off-grid control module is a real-time sampling output port v o2 Voltage v o2 The output signal of the off-grid control module is a group of main circuit switch tube control signals L drive The specific implementation method comprises the following steps:
by real-time sampling of the output port v o2 Voltage v of o2 And calculates the effective value v o2_rms With an effective value V of a reference voltage o2，ref And the compensation link C(s) obtains a control signal u (t) which is calculated by the following formula:
in the above formula, v o2_rms Is an output port v o2 Voltage v of o2 Effective value, V o2，ref Is an output port v o2 Voltage v of o2 Effective value of the reference voltage v e Is the voltage error value, C(s) is the compensator transfer function, which may be a proportional integral derivative regulation (PID) but is not limited to a PID controller. By lagging the control signal u by the phase of the network voltage v g 180 deg. reference sine wave v ref Multiplying to obtain a modulated voltage signal v o2，ref . Generating a control signal L of a main circuit power switch tube by adopting Sinusoidal Pulse Width Modulation (SPWM) modulation drive 。
The control mode switching module controls the output signal G of the grid-connected control module through the output voltage interval signal of the phase-locked loop module drive And an output signal L of the off-grid control module drive The positive level generating sub-circuit and the negative level generating sub-circuit are connected to drive the power switching tube to generate a correct output level, and the specific implementation method comprises the following steps:
when the phase-locked loop module judges that the current output voltage interval is P2-Pn, the control mode switching module controls a control signal G drive A positive level generating sub-circuit is connected to drive a related power switch tube, and an output port v o1 Outputting a positive half cycle; the control mode switching module switches the control signal L drive A negative level generating sub-circuit is connected to drive a related power switch tube, and an output port v o2 Outputting a negative half cycle;
when the phase-locked loop module judges that the current output voltage interval is N2-Nn, the control mode switching module switches the control signal G drive Connected to the negative level generating sub-circuit to drive the related power switch tube, and output port v o1 Outputting a negative half cycle; the control mode switching module switches the control signal L drive A positive level generating sub-circuit is connected to drive a related power switch tube, and an output port v o2 Outputting a positive half cycle;
when the phase-locked loop module judges that the current output voltage interval is P1 and N1, namely | v g |≤V in In this interval, the control mode switching module outputs the control signal G because the two output ports of the circuit need to be at zero voltage level at the same time drive Simultaneously connecting a positive level generating sub-circuit and a negative level generating sub-circuit to drive related power switch tubes, and the specific implementation method is as follows when a control signal G drive The power switch tube of the main circuit needs to be driven as an output port v o1 When providing zero voltage level output, the main circuit switch tube is the output port v at the same time o2 Providing a zero voltage level output when the control signal G is asserted drive Controlling the main circuit switch tube as the output port v o1 When non-zero voltage level output is provided, the main circuit switch tube is an output port v o2 Providing an opposite voltage level output.
Has the beneficial effects that:
the invention provides a control method of a multi-port multi-level inverter, which realizes that when a power main circuit inputs a single power supply, one double output port of the multi-level inverter is connected to the grid and the other double output port of the multi-level inverter supplies power to a local load, and through real-time monitoring of input power and output power of a double-port converter and under a special phase-locked loop mode identification method, two output ports can independently work in grid-connected and off-grid control states and independently distribute power and voltage control through a control switching strategy, so that power balance and power distribution control of a multi-port power supply with high power density are realized.
Drawings
FIG. 1 is a diagram of a dual-port multilevel inverter system and a control method for one-end grid connection and one-end local load connection provided by the present invention;
FIG. 2 is a schematic diagram illustrating the output voltage interval of the PLL module of the control circuit of the present invention;
FIG. 3 is a flow chart of a control mode switching module in the control circuit of the present invention;
FIG. 4 is a schematic circuit diagram of a two-port five-level switched capacitor inverter provided by an embodiment of the present invention;
fig. 5 (a) to 5 (c) are three specific equivalent operation mode diagrams of the embodiment of the present invention, wherein fig. 5 (a) is a schematic diagram illustrating that the output voltage levels of two output ports are both 0; FIG. 5 (b) shows an output port v o1 An output voltage level of V in Output port v o2 Output voltage level of-V in A schematic diagram of (a); FIG. 5 (c) shows an output port v o1 Output voltage level of-V in And an output port v o2 Output voltage level of V in Schematic representation of (a).
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Fig. 3 illustrates the configuration of the main circuit according to an embodiment of the present invention, which is a two-port five-level switched capacitor inverter circuit. The main circuit comprises: DC power supply (V) in ) A left sub-circuit of the switch capacitor, a right sub-circuit of the switch capacitor and an output port v o1 Half-bridge circuit, output port v o2 Half-bridge circuit and grid-connected filter (L) f ) (ii) a The switched capacitor left sub-circuit and the switched capacitor right sub-circuit respectively correspond to the negative level generating sub-circuit and the positive level generating sub-circuit; said output port v o1 Half-bridge circuit composed of power switch tube S 1 And power switch tube S 2 Connected in series, said output port v o2 Half-bridge circuit composed of power switch tube S 3 And power switch tube S 4 Are connected in series; power switchClosing pipe S 1 And the power switch tube S 2 Is connected to and forms the output port v o1 Power switch tube S 3 And the power switch tube S 4 Is connected to and forms the output port v o2 (ii) a Capacitor C of left sub-circuit of switched capacitor L1 Positive pole of (2) and power switch tube S L11 First output terminal and power switch tube S L12 Is connected to the second output terminal of the capacitor C L1 Negative electrode of (2) and power switch tube S L13 First output terminal and power switch tube S L21 Is connected to the second output terminal of the capacitor C L2 Positive pole of (2) and power switch tube S L21 First output terminal and power switch tube S L22 Is connected to the second output terminal of the capacitor C L2 Negative electrode of (2) and power switch tube S L23 Is connected to the power switch tube S 1 First output terminal of and the power switch tube S 3 A first output terminal of (1); capacitor C of right sub-circuit of switched capacitor R Positive pole of (2) and power switch tube S R12 Is connected to the power switch tube S 2 And the power switch tube S 4 Second output terminal of, capacitor C R Negative pole of (2) and power switch tube S R11 Second output terminal and power switch tube S R13 Is connected with the first output end; power switch tube S L12 First output end of the power switch tube S L22 First output terminal of (1), power switch tube S R12 And a direct current power supply (V) in ) Is connected with the positive output end of the power switch tube S L13 Second output terminal of the power switch tube S L23 Second output terminal, power switch tube S R13 And a direct current power supply (V) in ) The negative output ends of the two are connected; output port v o1 Connecting grid-connected filter (L) f ) Rear access grid (v) g ) Output port v o2 Local independent loads are connected.
In the double-port five-level switch capacitor inverter circuit, the capacitor is charged to V by being connected with the direct-current power supply in series in By passingCapacitor C in direct current power supply and switched capacitor right sub-circuit R Serially connected to provide output voltage level of 2V for two output ports in Providing an output voltage level V via two output ports of the DC power supply in Providing output voltage level-V for two output ports by discharging any capacitor in left sub-circuit of switched capacitor in Two capacitors in the left sub-circuit of the switched capacitor are discharged in series to provide output voltage level-2V for two output ports in 。
The specific control circuit works as follows: phase-locked loop module converts the network voltage v g And a supply voltage V in The integral multiple of the voltage is compared, the working process is divided into 4 output voltage intervals, the output voltage intervals are defined as follows, and the voltage v of the power grid g In positive half-wave, when V in ≤v g ≤2V in Defining an output voltage interval P2 when v is more than or equal to 0 g ≤V in Defining an output voltage interval P1; network voltage v g In the negative half-wave, when-V in ≤v g Defining an output voltage interval N1 when the voltage is less than or equal to 0; when-2V in ≤v g ≤-V in An output voltage interval N2 is defined.
The grid-connected power calculation module is used for calculating the V according to real-time sampling in 、i in 、v o2 、i o2 The network side power P is calculated by the following formula g ：
In the above formula, P g Is the grid-connected side power, P in Is the input power of a DC power supply, P o2 Is an output port v o2 Output power of V in Is a real-time sampled DC supply voltage i in Is a real-time sampled input current, v o2 Is an output port v for real-time sampling o2 Voltage of i o2 Output port v being a real-time sample o2 The current of (a);
the grid-connected control module controls the power based on a Peak Current Control (PCC) strategyParameter P g And reactive command signal Q ref Calculating a reference current i according to the following formula ref ：
In the above formula, P g Is an output port v o1 Power of (Q) ref Is reactive command power, V m，g Is the peak voltage of the grid;
control signal G of main circuit power switch tube drive The specific implementation method of the power switching tube of the driving main circuit comprises the following steps: real-time comparison output port v o1 Current i of g And a reference current i ref The PCC controller generates a main circuit power switch tube driving signal to enable the output port v o1 The corresponding voltage levels of the outputs are shown in the following table:
TABLE 1 output voltage level for different intervals of PCC controller
The input signal of the off-grid control module is a real-time sampling output port v o2 Voltage v of o2 The output signal of the off-grid control module is a group of main circuit switch tube control signals L drive The specific implementation method is as follows:
by real-time sampling of the output port v o2 Voltage v of o2 And calculates the effective value v o2_rms And a reference voltage effective value V o2，ref And the compensation link C(s) obtains a control signal u (t) and is calculated by the following formula:
in the above formula, v o2_rms Is an output port v o2 Voltage v of o2 Effective value, V o2，ref Is an output port v o2 Voltage v of o2 Is effective at a reference voltageValue v e Is the voltage error value, C(s) is the compensator transfer function, which may be a proportional integral derivative regulation (PID) but is not limited to a PID controller. By lagging the control signal u by the phase of the network voltage v g 180 deg. reference sine wave v ref Multiplying to obtain a modulated voltage signal v o2，ref . Generating a control signal L of a main circuit power switch tube by adopting Sinusoidal Pulse Width Modulation (SPWM) modulation drive 。
The control mode switching module controls the output signal G of the grid-connected control module through the output voltage interval signal of the phase-locked loop module drive And an output signal L of the off-grid control module drive The method is characterized in that a left sub-circuit and a right sub-circuit of a switched capacitor are accessed to drive a power switch tube to generate a correct output level, and the specific implementation method comprises the following steps:
when the phase-locked loop module judges that the current output voltage interval is P2, the control mode switching module controls the control signal G drive The right sub-circuit of the switch capacitor is connected to drive the related power switch tube, and the output port v o1 Outputting a positive half cycle; the control mode switching module switches the control signal L drive The left sub-circuit of the switched capacitor is connected to drive a related power switch tube, and an output port v o2 Outputting a negative half cycle;
when the phase-locked loop module judges that the current output voltage interval is N2, the control mode switching module controls a control signal G drive The left sub-circuit of the switched capacitor is connected to drive a related power switch tube, and an output port v o1 Outputting a negative half cycle; the control mode switching module switches the control signal L drive The right sub-circuit of the switch capacitor is connected to drive the related power switch tube, and the output port v o2 Outputting a positive half cycle;
when the phase-locked loop module judges that the current output voltage interval is P1 and N1, namely | v g |≤V in In this interval, the control mode switching module outputs the control signal G because the two output ports of the circuit need to be zero voltage level output at the same time drive Simultaneously connecting the left and right sub-circuits of the switched capacitor to drive the related power switch tube, and the specific implementation method is as follows when the control signal G drive Need to be drivenThe power switch tube of the moving main circuit is an output port v o1 When providing zero voltage level output, the main circuit switch tube is the output port v at the same time o2 Providing a zero voltage level output as shown in fig. 5 (a); when the control signal G is drive Controlling the main circuit switch tube as the output port v o1 When non-zero voltage level output is provided, the main circuit switch tube is an output port v o2 Providing opposite voltage level outputs as shown in fig. 5 (b) and 5 (c).
The above description is only for the preferred embodiment of the present invention, and should not be taken as limiting the invention in any way. Although the preferred embodiments of the present invention have been described, it is not intended that the invention be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention, unless the technical essence of the present invention is not departed from the content of the technical solution of the present invention.
Claims (7)
1. A control method of a dual-port multi-level inverter is characterized by comprising a main power circuit, a grid-connected control module, an off-grid control module, a phase-locked loop module and a control mode switching module.
2. The method for controlling the dual-port multilevel inverter of claim 1, wherein the dual-port multilevel inverter output port v is o1 Grid connected, output port v o2 Local independent loads are connected. The main power circuit includes: DC power supply (V) in ) Positive level generating sub-circuit, negative level generating sub-circuit, output port v o1 Half-bridge circuit, output port v o2 Half-bridge circuit, grid-connected filter (L) f ) (ii) a Said output port v o1 Half-bridge circuit composed of power switch tube S 1 And power switch tube S 2 Are connected in series, toSaid output port v o2 Half-bridge circuit composed of power switch tube S 3 And a power switch tube S 4 Are connected in series; the first output end of the positive level generating sub-circuit and the first output end of the negative level generating sub-circuit are connected to the positive output end of the direct current power supply, the second output end of the positive level generating sub-circuit, the second output end of the negative level generating sub-circuit and the negative output end of the direct current power supply are connected to the ground, and the power switch tube S 1 First output terminal of and the power switch tube S 3 Is connected to the third output terminal of the negative level generating sub-circuit, the power switch tube S 2 And the power switch tube S 4 Is connected to a third output terminal of the positive level generating sub-circuit, the power switching tube S 1 And the power switch tube S 2 Is connected to and forms said output port v o1 Said power switch tube S 3 And the power switch tube S 4 Is connected to and forms the output port v o2 Said output port v o1 Connecting grid-connected filter (L) f ) Rear access grid (v) g ) Said output port v o2 Local independent loads are connected.
3. The control method of the dual-port multi-level inverter according to claim 1, wherein the control circuit comprises a grid-connected control module, an off-grid control module, a phase-locked loop module and a control mode switching module; the control mode switching module controls the output signal of the grid-connected control module and the output signal of the off-grid control module through the output voltage interval judgment signal output by the phase-locked loop module.
4. The control circuit of claim 3, wherein the output AC voltage level is 2n +1, n is a natural number greater than or equal to 1. Phase-locked loop module converts the network voltage v g And a supply voltage V in Is integral multiple ofIn contrast, the working process is divided into 2n output voltage intervals. The output voltage interval is defined as follows, the network voltage v g In the case of positive half wave, when (n-1) V in ≤v g ≤nV in An output voltage interval Pn is defined, n is a natural number which is greater than or equal to 1, and the value of n is 1,2,3. Specifically, when n =1, 0. Ltoreq. V g ≤V in Defining an output voltage interval P1; when n =2, V in ≤v g ≤2V in The output voltage interval P2 is defined, and so on.
Network voltage v g When it is a negative half wave, (n-1) V in ≤|v g |≤nV in An output voltage interval Nn is defined, n is a natural number which is more than or equal to 1, and the value of n is 1,2,3. In particular when n =1, -V in ≤v g Defining an output voltage interval N1 when the voltage is less than or equal to 0; -2V when n =2 in ≤v g ≤-V in The output voltage interval N2 is defined, and so on.
5. The control circuit of claim 3, wherein the input signal of the grid-connected control module is a real-time sampled power supply voltage V in Input current i in Voltage v of the power grid g Output port v o1 Current i of g And reactive command power Q ref And an output port v o2 Voltage v of o2 And an output port v o2 Current i of o2 The output signal of the grid-connected control module is a group of main circuit switch tube control signals G drive The specific implementation method is as follows:
the grid-connected power calculation module is used for calculating the V according to real-time sampling in 、i in 、v o2 、i o2 The network side power P is calculated by the following formula g ：
In the above formula, P g Is the grid-connected side power, P in Is the input power, P, of the DC power supply o2 Is an output port v o2 Output power of V in Is a real-time sampled DC supply voltage i in Is a real-time sampled input current, v o2 Is an output port v for real-time sampling o2 Voltage of i o2 Is an output port v for real-time sampling o2 The current of (a);
the grid-connected control module controls the power parameter P based on a Peak Current Control (PCC) strategy g And reactive command signal Q ref Calculating a reference current i according to the following formula ref ：
In the above formula, P g Is an output port v o1 Power of Q ref Is reactive command power, V m，g Is the peak voltage of the grid;
control signal G of main circuit power switch tube drive The specific implementation method of the power switching tube of the driving main circuit comprises the following steps: real-time comparison output port v o1 Current i of g And a reference current i ref Grid voltage v g If the current is positive half-wave and the phase-locked loop module judges that the current output voltage interval is Pn, the current i at the grid-connected side is g Is greater than or equal to the reference current i ref The PCC controller generates a main circuit power switch tube driving signal to enable the output port v o1 The output voltage level is (n-1) V in (ii) a If the current i at the grid-connected side g Is smaller than the reference current i ref When the PCC controller generates a main circuit power switch tube driving signal to enable the output port v o1 Output voltage level of nV in . Network voltage v g If the output port v is a negative half-wave and the phase-locked loop module judges that the current output voltage interval is Nn o1 Current i g Is greater than or equal to the reference current i ref When the PCC controller generates a main circuit power switch tube driving signal to enable an output port v o1 Output voltage level of-nV in (ii) a If the output port v o1 Current i g Is smaller than the reference current i ref When the PCC controller generates a main circuit power switch tube driving signal to enable an output port v o1 The output voltage level is- (n-1) V in 。
6. The control circuit of claim 3, wherein the off-grid control module input signal is a real-time sampling output port v o2 Voltage v of o2 The output signal of the off-grid control module is a group of main circuit switch tube control signals L drive The specific implementation method is as follows: by sampling the output port v in real time o2 Voltage v of o2 And calculates the effective value v o2_rms And a reference voltage effective value V o2，ref And the compensation link C(s) obtains a control signal u (t) and is calculated by the following formula:
in the above formula, v o2_rms Is an output port v o2 Voltage v of o2 Effective value of (V) o2，ref Is an output port v o2 Voltage v of o2 Effective value of the reference voltage v e Is the voltage error value, C(s) is the compensator transfer function, which may be a proportional integral derivative regulation (PID) but is not limited to a PID controller. By lagging the control signal u by the phase of the network voltage v g 180 deg. reference sine wave v ref Multiplying to obtain a modulated voltage signal v o2，ref . Generation of control signal L for main circuit power switching tube by using Sinusoidal Pulse Width Modulation (SPWM) modulation drive 。
7. The control circuit of claim 3, wherein the control mode switching module controls the output signal G of the grid-connected control module according to the output voltage interval signal of the phase-locked loop module drive And an output signal L of the off-grid control module drive The positive level generating sub-circuit and the negative level generating sub-circuit are connected to drive the power switch tube to generate positiveThe specific implementation method of the definite output level is as follows:
when the phase-locked loop module judges that the current output voltage interval is P2-Pn, the control mode switching module controls a control signal G drive A positive level generating sub-circuit is connected to drive a related power switch tube, and an output port v o1 Outputting a positive half cycle; the control mode switching module switches the control signal L drive A negative level generating sub-circuit is connected to drive a related power switch tube, and an output port v o2 Outputting a negative half cycle;
when the phase-locked loop module judges that the current output voltage interval is N2-Nn, the control mode switching module controls the control signal G drive Connected to the negative level generating sub-circuit to drive the related power switch tube, and output port v o1 Outputting a negative half cycle; the control mode switching module switches the control signal L drive A positive level generating sub-circuit is connected to drive a related power switch tube, and an output port v o2 Outputting a positive half cycle;
when the phase-locked loop module judges that the current output voltage interval is P1 and N1, namely | v g |≤V in In this interval, the control mode switching module outputs the control signal G because the two output ports of the circuit need to be at zero voltage level at the same time drive Simultaneously connecting a positive level generating sub-circuit and a negative level generating sub-circuit to drive related power switch tubes, and the specific implementation method is as follows when a control signal G drive The power switch tube of the main circuit needs to be driven as an output port v o1 When zero voltage level output is provided, the main circuit switch tube is simultaneously an output port v o2 Providing a zero voltage level output when the control signal G is asserted drive Controlling the main circuit switch tube as an output port v o1 When non-zero voltage level output is provided, the main circuit switch tube is an output port v o2 Providing an opposite voltage level output.
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| CN113381632A (en) * | 2021-05-31 | 2021-09-10 | 郑州大学 | Non-bridge type modular inverter and control method thereof |
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