Unidirectional energy storage dc-dc converter control system and method for wave power

Abstract

The application discloses a one-way energy storage DC-DC converter control system and method for wave power generation, comprising a bridge rectification unit, a hybrid full-half bridge DC-AC unit, a double transformer unit, a resonance unit, a high-frequency AC-DC full bridge unit and a direct current bus; in the system, the bridge rectification unit, the hybrid full-half bridge DC-AC unit, the double transformer unit, the resonance unit, the high-frequency AC-DC full bridge unit and the direct current bus are sequentially connected to provide stable direct current voltage for the direct current bus. Since there are problems of active device damage caused by large voltage fluctuation and conversion efficiency reduction caused by high backflow power in the process of electric energy conversion of the wave energy power generation system, the application adopts a double-loop topological structure and a minimum power loss control method, can be applied to the electric energy conversion system in the wave energy power generation, the system can realize zero backflow power, reduce conduction loss, greatly improve the electric energy conversion efficiency and the electric energy quality of output.

Description

Technical Field

[0001] This invention relates to the field of DC-DC converter control technology, and more specifically to a unidirectional energy storage DC-DC converter control system and method for wave power generation. Background Technology

[0002] Wave power generation and conversion systems convert wave energy into mechanical energy, and then into electrical energy to provide voltage to the DC bus. However, due to the significant fluctuations in ocean waves, both calm and large waves can affect the output voltage. Using conventional uncontrolled rectifiers makes the circuit difficult to control due to large DC-side voltage variations. Furthermore, due to the immaturity of the technology, these devices generate high output power, resulting in significant losses and low efficiency during power transmission. Summary of the Invention

[0003] The purpose of this invention is to provide a control system and method for a unidirectional energy storage DC-DC converter for wave power generation, which eliminates output power, realizes soft switching, reduces conduction losses, and greatly improves the power transmission efficiency of the system.

[0004] The technical solution to achieve the purpose of this invention is as follows:

[0005] A unidirectional energy storage DC-DC converter control system for wave power generation includes a wave power generation device and a bridge rectifier unit connected to the wave power generation device. The bridge rectifier unit is connected to a hybrid full-half-bridge DC-AC unit. The output of the hybrid full-half-bridge DC-AC unit is connected to the primary side of a dual-transformer unit, forming a dual-loop topology using a full-bridge and half-bridge connection. The secondary side of the dual-transformer unit is connected to the input of a high-frequency AC-DC full-bridge unit through a resonant unit. The output of the high-frequency AC-DC full-bridge unit is connected to a DC bus, providing a stable DC voltage to the DC bus.

[0006] It also includes a resonant current phase adjustment module to adjust the resonant current phase. Zero-crossing adjustment γ This ensures that the resonant current is in phase with the voltage waveform, thus eliminating the reactive power of the high-frequency rectifier bridge.

[0007] In a preferred embodiment, the hybrid full-half-bridge DC-AC unit includes a voltage equalization capacitor. C 1 , C 2 and switching transistors S 1 ~ S 4 The high-frequency AC-DC full-bridge unit includes switching transistors. Q 1 , Q2 and diodes D 1 , D 2 The dual-transformer device consists of two transformers, including a full-bridge transformer and a half-bridge transformer, wherein the primary side of the full-bridge transformer is connected to... S 1 , S 2 Bridge arm midpoint and connection S 3 , S 4 The full-bridge transformer at the midpoint of the bridge arm, the primary side of the half-bridge transformer connected to... S 1 , S 2 Midpoint of bridging arm and C 1 , C 2 The half-bridge transformer at the midpoint of the voltage equalizing capacitor forms a dual-loop topology of full-bridge and half-bridge on the primary side. One end of the secondary side of the full-bridge transformer is connected to one end of the secondary side of the half-bridge transformer; the other end of the secondary side of the full-bridge transformer is connected to a diode via a resonant unit. D 1 , D 2 At the midpoint, the other end of the secondary side of the half-bridge transformer is connected to the switching transistor. Q 1 , Q 2 Midpoint of the bridge arm.

[0008] The preferred technical solution also includes a control switch transistor. S 1 The pulse width is 0, and the switching transistor... S 2 The pulse width is π Switching transistor S 3 The pulse width is α arrive π + α Switching transistor S 4 The pulse width is π + α arrive 2π + α And the switching transistor S 3 Lag switching transistor S 1 Angle is α This generates an alternating voltage. , for S 1, S 2 Bridge arm midpoint and S 3 , S 4 Voltage between midpoints of bridge arms contain +V 1 , -V 1 Three voltage levels: 0, 1, and 0; generating AC voltage. , for S 1 , S 2 Midpoint of bridging arm and C 1 , C 2 The voltage between points in the equalizing capacitor. contain +1 / 2V 1 , -1 / 2V 1 Two voltage levels, V 1 This is the input voltage.

[0009] The preferred technical solution also includes a control switch transistor. Q 1 The pulse width is β arrive π + β Switching transistor Q 2 The pulse width is π + β arrive 2π + β This generates an alternating voltage. , This represents the voltage between the midpoints of diodes D1 and D2 and the midpoints of the bridge arms of switching transistors Q1 and Q2. contain +V 2 , -V 2 Three voltage levels: 0, 1, and 2. V 2 This is the output voltage.

[0010] The preferred technical solution also includes performing steady-state analysis using the fundamental wave approximation method to obtain... , and The fundamental phasors of the three voltages are used right , and After normalization, the normalized phasor expression is as follows:

[0011] ;

[0012] ;

[0013] ;

[0014] In the formula, yes The normalized vector; yes The normalized vector; yes The normalized vector; The basic value; Voltage gain;

[0015] The preferred technical solution also includes: and merged into The circuit is simplified to an equivalent circuit diagram, resulting in... :

[0016] .

[0017] Based on the normalized switching frequency quality factor The normalized impedance of the capacitor is obtained as follows: ;

[0018] in, The switching angular frequency, The normalized resonant angular frequency, For resonant capacitor, It is a resonant inductor;

[0019] in, For normalized impedance, Where n is the load resistance and n is the transformer turns ratio coefficient.

[0020] The normalized resonant current expression obtained from the equivalent circuit diagram is as follows:

[0021] .

[0022] in, ;

[0023] in, .

[0024] The preferred technical solution also includes, according to the formula Calculate normalized power :

[0025] .

[0026] The resonant current is obtained based on the minimum power loss control method. effective value :

[0027] .

[0028] The preferred technical solution also includes establishing a model based on the obtained steady-state model of resonant current and output power. Lagrange's equation:

[0029] .

[0030] in, For Lagrange optimization functions; C represents a scalar value; C represents a constraint condition.

[0031] Will right Taking the partial derivative, we get:

[0032] ;

[0033] in, .

[0034] Will right Taking the partial derivative, we get:

[0035] ;

[0036] Will right Taking the partial derivative, we get:

[0037] ;

[0038] Simplifying the above three equations, we obtain the relationship for the zero reflux control method:

[0039] .

[0040] Substituting the formula for the minimum power loss control method into... Simplify to obtain the minimum power loss :

[0041] .

[0042] control of Pulse width right The size is controlled.

[0043] A control method for a unidirectional energy storage DC-DC converter for wave power generation, applied to the aforementioned unidirectional energy storage DC-DC converter control system for wave power generation, includes the following steps:

[0044] S01: Control switch transistor S 1 The pulse width is 0, and the switching transistor... S 2 The pulse width is π Switching transistor S 3 The pulse width is α arrive π + α Switching transistor S 4 The pulse width is π + α arrive 2π + α And the switching transistor S 3 Lag switching transistor S 1 Angle is α This generates an alternating voltage. , for S 1 , S 2 Bridge arm midpoint and S 3 , S 4 Voltage between midpoints of bridge arms; generates alternating voltage. , for S 1 , S 2 Midpoint of bridging arm and C 1 , C 2 The voltage between points in the equalizing capacitor;

[0045] S02: Control switch transistor Q 1 The pulse width is β arrive π + β Switching transistor Q 2 The pulse width is π + β arrive 2π + β This generates an alternating voltage. , This is the voltage between the midpoints of diodes D1 and D2 and the midpoints of the bridge arms of switching transistors Q1 and Q2;

[0046] S03: Regarding the resonant current Adjust the phase of the resonant current: Zero-crossing adjustment γ This ensures that the resonant current is in phase with the voltage waveform, thus eliminating the reactive power of the high-frequency rectifier bridge.

[0047] The present invention also discloses a computer storage medium storing a computer program, which, when executed, implements the control method of the unidirectional energy storage DC-DC converter control system for wave power generation described above.

[0048] Compared with the prior art, the significant advantages of this invention are:

[0049] (1) The present invention proposes an energy conversion system suitable for wave energy generation. Its topology uses two diodes on the secondary side to replace the traditional MOS switching transistors, which reduces the switching transistor losses and the cost of converter manufacturing. The primary side adopts a dual-loop topology with full-bridge and half-bridge connections, respectively, which realizes four voltage levels. The high-frequency AC voltage level can reach up to 1.5 times the input voltage, further reducing current stress and extending the service life of active devices and high-frequency transformers.

[0050] (2) The present invention optimizes the problem of excessive output side return power and low converter operating efficiency by using the minimum power loss control method, thereby achieving minimum conduction power loss and improving system efficiency. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of a unidirectional energy storage DC-DC converter control system used for wave power generation.

[0052] Figure 2 By controlling the switching transistor S 1 ~ S 4 and switching transistor Q 1 , Q 2 The generated AC voltage waveform and resonant current waveform;

[0053] Figure 3 This is the equivalent circuit diagram in the phasor domain of the unidirectional energy storage DC-DC converter control system used for wave power generation, established using FHA.

[0054] Figure 4 Is when M =0.5, k=1, V1 =150V, V 2 =75V, P =400W, v ab , v ac 、v mn , i L And the current waveforms of each switching transistor.

[0055] Figure 5 Is when M =0.5, k=1, V 1 =150V, V 2 =75V, P =200W, v ab , v ac 、v mn , i L And the current waveforms of each switching transistor. Detailed Implementation

[0056] The principle of this invention is as follows: Due to the problems of large voltage fluctuations leading to damage to active devices and high return power leading to reduced conversion efficiency in the power conversion process of wave energy power generation systems, this invention adopts a dual-loop topology structure and a minimum power loss control method to design a power conversion system applicable to wave energy power generation. This system can achieve zero return power, reduce conduction losses, and greatly improve the system's power conversion efficiency and output power quality.

[0057] Example 1:

[0058] like Figure 1 As shown in the figure, the power conversion system proposed in this case for wave energy generation includes a bridge rectifier unit, a hybrid full-half-bridge DC-AC unit, a dual transformer unit, a resonant unit, a high-frequency AC-DC full-bridge unit, and a DC bus. The wave power generation device is connected to the bridge rectifier unit, which is connected to the hybrid full-half-bridge DC-AC unit. The output of the hybrid full-half-bridge DC-AC unit is connected to the primary side of the dual transformer unit, forming a dual-loop topology using a full-bridge and half-bridge connection. The secondary side of the dual transformer unit is connected to the input of the high-frequency AC-DC full-bridge unit through the resonant unit. The output of the high-frequency AC-DC full-bridge unit is connected to the DC bus, providing a stable DC voltage to the DC bus.

[0059] In one embodiment, the hybrid full-half-bridge DC-AC unit includes a voltage equalization capacitor.C 1 , C 2 and switching transistors S 1 ~ S 4 The high-frequency AC-DC full-bridge unit includes switching transistors. Q 1 , Q 2 and diodes D 1 , D 2 The dual-transformer device consists of two transformers, including a full-bridge transformer and a half-bridge transformer, wherein the primary side of the full-bridge transformer is connected to... S 1 , S 2 Bridge arm midpoint and connection S 3 , S 4 The primary side connection of the full-bridge transformer and the half-bridge transformer at the midpoint of the bridge arm. S 1 , S 2 Midpoint of bridging arm and C 1 , C 2 The half-bridge transformer at the midpoint of the voltage equalizing capacitor forms a dual-loop topology on the primary side, consisting of a full-bridge and a half-bridge. One end of the secondary side of the full-bridge transformer is connected to one end of the secondary side of the half-bridge transformer; the other end of the secondary side of the full-bridge transformer is connected to a diode via a resonant element. D 1 , D 2 At the midpoint, the other end of the secondary side of the half-bridge transformer is connected to the switching transistor. Q 1 , Q 2 Midpoint of the bridge arm.

[0060] The turns ratio of the full-bridge transformer is n1:1, and the turns ratio of the half-bridge transformer is n2:1. The transformer turns ratios are then... n 2 : n 1 Defined as k.

[0061] Ideally, to achieve better performance, set n 1 = n 2 =n ,Right now k= 1.

[0062] Specifically, switching transistors S 1 ~S 4 Including body diode d S1 ~ d S4 and parasitic capacitance C S1 ~ C S4 .

[0063] The high-frequency AC-DC full-bridge unit consists of switching transistors Q 1 , Q 2 Body diode d Q1 , d Q2 Parasitic capacitance C Q1 , C Q2 ,diode D 1 , D 2 Filter capacitor C 0 and output voltage V 2 composition.

[0064] The resonant unit consists of a resonant capacitor. C s Resonant inductor L s They are connected sequentially to form a whole.

[0065] like Figure 2 As shown, the switching transistors in the hybrid full-half-bridge DC-AC unit S 1 The pulse width is 0 to π Switching transistor S 2 The pulse width is π arrive 2π Switching transistor S 3 The pulse width is α arrive π + α Switching transistor S 4 The pulse width is π + α arrive 2π + α This generates an alternating voltage. contain +V1 , -V 1 Three voltage levels, 0, 1, and 2, generate AC voltage. contain +1 / 2V 1 , -1 / 2V 1 Two voltage levels, for and The superposition contains +1.5V 1 , -1.5V 1 , +1 / 2V 1 , -1 / 2V 1 Four voltage levels.

[0066] Specifically, the switching transistors in the high-frequency AC-DC full-bridge unit Q 1 The pulse width is β arrive π + β Switching transistor Q 2 The pulse width is π + β arrive 2π + β This generates an alternating voltage. contain +V 2 , -V 2 There are three voltage levels: 0, 0, and 1.

[0067] Specifically, the resonant current Zero-crossing adjustment γ This ensures that the resonant current is in phase with the voltage waveform, eliminating the reactive power of the high-frequency rectifier bridge and achieving zero return power.

[0068] In another embodiment, a control method for a unidirectional energy storage DC-DC converter for wave power generation is applied to the aforementioned unidirectional energy storage DC-DC converter control system for wave power generation. The control method includes the following steps:

[0069] S01: Control switch transistor S 1 The pulse width is 0, and the switching transistor... S 2 The pulse width is π Switching transistor S 3 The pulse width is α arrive π + α Switching transistor S4 The pulse width is π + α arrive 2π + α And the switching transistor S 3 Lag switching transistor S 1 Angle is α This generates an alternating voltage. , for S 1 , S 2 Bridge arm midpoint and S 3 , S 4 Voltage between midpoints of bridge arms; generates alternating voltage. , for S 1 , S 2 Midpoint of bridging arm and C 1 , C 2 The voltage between points in the equalizing capacitor;

[0070] S02: Control switch transistor Q 1 The pulse width is β arrive π + β Switching transistor Q 2 The pulse width is π + β arrive 2π + β This generates an alternating voltage. , This is the voltage between the midpoints of diodes D1 and D2 and the midpoints of the bridge arms of switching transistors Q1 and Q2;

[0071] S03: Regarding the resonant current Adjust the phase of the resonant current: Zero-crossing adjustment γ This ensures that the resonant current is in phase with the voltage waveform, thus eliminating the reactive power of the high-frequency rectifier bridge.

[0072] Specifically, steady-state analysis using the Fundamental Harmonic Approximation (FHA) method yields... , and The fundamental phasors of the three voltages are used right , and After normalization, the normalized phasor expression is as follows:

[0073] ;

[0074] ;

[0075] ;

[0076] In the formula yes The normalized vector; yes The normalized vector; yes The normalized vector; As a basic value, it is defined as follows: ; Voltage gain is defined as .

[0077] Will and The two were merged into To simplify the circuit, such as Figure 3 As shown.

[0078] ;

[0079] Based on the normalized switching frequency quality factor The normalized impedance of the capacitor can then be obtained: .

[0080] in, The switching angular frequency, The normalized resonant angular frequency, For resonant capacitor, It is a resonant inductor.

[0081] in, For normalized impedance, This is the load resistance.

[0082] According to the equivalent circuit diagram, the normalized resonant current expression is:

[0083] .

[0084] in, .

[0085] in, .

[0086] According to the formula The normalized power can be calculated. :

[0087] .

[0088] Specifically, the minimum power loss control method includes the following processes:

[0089] .

[0090] Based on the obtained steady-state model of resonant current and output power, a model is established regarding... Lagrange's equation:

[0091] ;

[0092] in, For Lagrange optimization functions; C is a scalar value that measures the impact of constraints on the function; C is a quantitative constraint.

[0093] Will right Taking the partial derivative, we get:

[0094] .

[0095] in, .

[0096] Will right Taking the partial derivative, we get:

[0097] ;

[0098] Will right Taking the partial derivative, we get:

[0099] ;

[0100] Simplifying the above three equations yields the relationship for the minimum power loss control method:

[0101] .

[0102] Substituting the formula for the minimum power loss control method into... The minimum power loss can be obtained by simplification. :

[0103] .

[0104] From the formula It is known that only control is needed. of Pulse width That is enough to The size is controlled.

[0105] In another embodiment, a computer storage medium stores a computer program that, when executed, implements the control method described above for a unidirectional energy storage DC-DC converter control system for wave power generation.

[0106] The specific implementation method can be the one described above, and will not be repeated here.

[0107] To ensure the converter operates efficiently, appropriate parameter design is required:

[0108] choose Q =1, F =1.4, ω S =200πkHz, L r =31.34μH, C r =158.56nF.

[0109] Design input voltage V 1 150V, output voltage V 2 It operates at 75V and has a rated power of 400W.

[0110] Simulations were performed based on the designed input and output voltages and power, and all switches were able to achieve soft switching.

[0111] To verify the correctness of the theory, simulation tests were conducted in PSIM.

[0112] when M =0.5, k=1, V 1 =150V, V 2 =75V, P =400W, v ab , v ac 、v mn , i L The current waveforms of each switching transistor are shown below. Figure 4 As shown.

[0113] when M =0.5, k=1, V 1 =150V, V 2 =75V,P =200W, v ab , v ac 、v mn , i L The current waveforms of each switching transistor are shown below. Figure 5 As shown.

[0114] After verification with simulation waveforms, it was found that the theory and the practice were consistent, proving that the invention is feasible.

[0115] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A unidirectional energy storage DC-DC converter control system for wave power generation, comprising a wave power generation device and a bridge rectifier unit connected to the wave power generation device, characterized in that, The bridge rectifier unit is connected to the hybrid full-bridge DC-AC unit. The output of the hybrid full-bridge DC-AC unit is connected to the primary side of the dual transformer unit, forming a dual-loop topology using a full-bridge and half-bridge connection. The secondary side of the dual transformer unit is connected to the input of the high-frequency AC-DC full-bridge unit through a resonant unit. The output of the high-frequency AC-DC full-bridge unit is connected to the DC bus, providing a stable DC voltage to the DC bus. It also includes a resonant current phase adjustment module to adjust the resonant current phase. i L Zero-crossing adjustment γ This ensures that the resonant current is in phase with the voltage waveform, thus eliminating the reactive power of the high-frequency rectifier bridge. The hybrid full-half-bridge DC-AC unit includes a voltage equalization capacitor. C 1 , C 2 and switching transistors S 1 ~ S 4 The high-frequency AC-DC full-bridge unit includes switching transistors. Q 1 , Q 2 and diodes D 1 , D 2 The dual-transformer device consists of two transformers, including a full-bridge transformer and a half-bridge transformer, wherein the primary side of the full-bridge transformer is connected to... S 1 , S 2 Bridge arm midpoint and connection S 3 , S 4 The full-bridge transformer at the midpoint of the bridge arm, the primary side of the half-bridge transformer connected to... S 1 , S 2 Midpoint of bridging arm and C 1 , C 2 The half-bridge transformer at the midpoint of the voltage equalizing capacitor forms a dual-loop topology of full-bridge and half-bridge on the primary side. One end of the secondary side of the full-bridge transformer is connected to one end of the secondary side of the half-bridge transformer; the other end of the secondary side of the full-bridge transformer is connected to a diode via a resonant unit. D 1 , D 2 At the midpoint, the other end of the secondary side of the half-bridge transformer is connected to the switching transistor. Q 1 , Q 2 Midpoint of the bridge arm; Control switch tube S 1 The pulse width is 0 to π Switching transistor S 2 The pulse width is π arrive 2π Switching transistor S 3 The pulse width is α arrive π + α Switching transistor S 4 The pulse width is π + α arrive 2π + α And the switching transistor S 3 Lag switching transistor S 1 Angle is α This generates an alternating voltage. v ab , v ab for S 1 , S 2 Bridge arm midpoint and S 3 , S 4 Voltage between midpoints of bridge arms v ab contain +V 1 , -V 1 Three voltage levels: 0, 1, and 0; generating AC voltage. v ac , v ac for S 1 , S 2 Midpoint of bridging arm and C 1 , C 2 The voltage between points in the equalizing capacitor. v ac contain +1 / 2V 1 , -1 / 2V 1 Two voltage levels, V 1 Input voltage, v ab and v ac superposition v de contain +1.5V 1 , -1.5V 1 , +1 / 2V 1 , -1 / 2V 1 Four voltage levels; It also includes control switching transistors. Q 1 The pulse width is β arrive π + β Switching transistor Q 2 The pulse width is π + β arrive 2π + β This generates an alternating voltage. v mn , v mn This represents the voltage between the midpoints of diodes D1 and D2 and the midpoints of the bridge arms of switching transistors Q1 and Q2. v mn contain + V 2 , -V 2 Three voltage levels: 0, 1, and 2. V 2 This is the output voltage.

2. The unidirectional energy storage DC-DC converter control system for wave power generation according to claim 1, characterized in that, It also includes using the fundamental wave approximation analysis method to perform steady-state analysis, and obtaining... v ab , v ac and v mn The fundamental phasors of the three voltages are used v B right v ab , v ac and v mn After normalization, the normalized phasor expression is as follows: In the formula, yes v ab The normalized vector; yes v ac The normalized vector; yes v mn The normalized vector; v B The basic value; M This represents the voltage gain.

3. The unidirectional energy storage DC-DC converter control system for wave power generation according to claim 2, characterized in that, It also includes, and merged into The circuit is simplified to an equivalent circuit diagram, resulting in... : Based on the normalized switching frequency quality factor The normalized impedance of the capacitor is obtained as follows: ; in, ω s The switching angular frequency, The normalized resonant angular frequency, C s For resonant capacitor, L s It is a resonant inductor; in, For normalized impedance, ； The normalized resonant current expression obtained from the equivalent circuit diagram is as follows: in, in, .

4. The unidirectional energy storage DC-DC converter control system for wave power generation according to claim 3, characterized in that, It also includes, according to the formula Calculate normalized power P pu : The resonant current is obtained based on the minimum power loss control method. i L effective value : 。 5. The unidirectional energy storage DC-DC converter control system for wave power generation according to claim 4, characterized in that, It also includes establishing a model based on the obtained steady-state model of resonant current and output power, regarding... I rms Lagrange's equation: in, L For Lagrange optimization functions; λ C is a scalar value, and C is a constraint condition. Will L right α Taking the partial derivative, we get: in, Will L right β Taking the partial derivative, we get: Will L right γ Taking the partial derivative, we get: Simplifying the above three equations, we obtain the relationship for the zero reflux control method: Substituting the formula for the minimum power loss control method into... P pu Simplify to obtain the minimum power loss P M : control v ab of V 1 Pulse width α right P M The size is controlled.

6. A control method for a unidirectional energy storage DC-DC converter for wave power generation, characterized in that, The control method applied to the unidirectional energy storage DC-DC converter control system for wave power generation as described in claim 1 includes the following steps: S01: Control switch transistor S 1 The pulse width is 0, and the switching transistor... S 2 The pulse width is π Switching transistor S 3 The pulse width is α arrive π + α Switching transistor S 4 The pulse width is π + α arrive 2π + α And the switching transistor S 3 Lag switching transistor S 1 Angle is α This generates an alternating voltage. v ab , v ab for S 1 , S 2 Bridge arm midpoint and S 3 , S 4 Voltage between midpoints of bridge arms; generates alternating voltage. v ac , v ac for S 1 , S 2 Midpoint of bridging arm and C 1 , C 2 The voltage between points in the equalizing capacitor; S02: Control switch transistor Q 1 The pulse width is β arrive π + β Switching transistor Q 2 The pulse width is π + β arrive 2π + β This generates an alternating voltage. v mn , v mn This is the voltage between the midpoints of diodes D1 and D2 and the midpoints of the bridge arms of switching transistors Q1 and Q2; S03: Regarding the resonant current i L Adjust the phase of the resonant current: i L Zero-crossing adjustment γ This ensures that the resonant current is in phase with the voltage waveform, thus eliminating the reactive power of the high-frequency rectifier bridge.

7. A computer storage medium having a computer program stored thereon, characterized in that, When the computer program is executed, it implements the control method of the unidirectional energy storage DC-DC converter control system for wave power generation as described in claim 6.

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