CN205301603U - Ocean controllable source transmitting system - Google Patents

Abstract

The utility model relates to an ocean controllable source transmitting system. This system includes the high -power generator for produce three -phase alternating current, still include: on ship transformer unit, transformer unit and emitting electrode under water, wherein: on the ship transformer unit the input with the high -power generator is connected for convert the three -phase alternating current who imports to a single phase alternating current, under water the transformer unit the input with the output of transformer unit is connected on the ship, be used for with a single phase alternating current electricity converts first direct current to, emitting electrode's input with the output of transformer unit is connected under water for become the first direct current contravariant of inputing the interchange square signal of certain frequency. The utility model has the characteristics of switching loss is low, and power factor is high, and the voltage stress is little, and power is big, and is small, light in weight.

Description

An ocean controllable source launch system

technical field

The utility model relates to the technical field of marine electromagnetic detection, in particular to a marine controllable source emission system.

Background technique

In the process of exploration and development of marine resources, due to high drilling costs and high investment risks, major oil companies in the world must carry out comprehensive exploration work using various marine geophysical methods such as seismic, gravity, and magnetic force before offshore drilling. Improve drilling success rate. Marine controlled-source electromagnetic detection has the characteristics of being able to distinguish the properties of oil and water in traps and reveal "high-resistivity bodies" covered by volcanic rocks, and has become one of the most important means to reduce the drilling risk of deep-water oil and gas resources. The controllable source marine electromagnetic exploration system is excited by the transmitter towed by the tugboat to supply power to the seabed, and the multi-component electromagnetic receiver is placed on the seabed to measure the electromagnetic field value. By calculating the apparent resistivity and phase, or directly using the observed electric field and magnetic field to detect the distribution characteristics of underground electrical properties, reveal the underlying structure and the distribution of mineral resources such as oil and gas.

As an important part of marine controlled source electromagnetic detection, the marine controlled source electromagnetic launch system provides artificial excitation field sources for the exploration process. However, due to the particularity of the load object, various technical difficulties are often faced in the process of ocean controllable source electromagnetic emission: the submarine cable of several thousand meters leads to low power factor and serious waveform distortion in the process of AC transmission; the underwater cabin The power conversion module in it has a large volume and poor heat dissipation, which greatly reduces the stability of the launch system. The electrical stress of the power device is low, which limits the output power of the transmitting system and affects the exploration effect.

Utility model content

One of the purposes of the present utility model is to provide a marine controllable source launch system to solve the problems of low power factor, serious waveform distortion, oversized power conversion module and poor heat dissipation in the process of long-distance AC power transmission in the prior art question.

In order to achieve the purpose of the above-mentioned utility model, the embodiment of the utility model provides a marine controllable source emission system, which includes a high-power generator for generating three-phase alternating current, and also includes: an on-board substation unit, an underwater substation unit and emitter electrode, where:

The input end of the on-board power conversion unit is connected to the high-power generator for converting the input three-phase alternating current into a first single-phase alternating current;

The input end of the underwater power transformation unit is connected to the output end of the onboard power transformation unit, and is used to convert the first single-phase alternating current into a first direct current;

The input end of the transmitting electrode is connected with the output end of the underwater power transformation unit, and is used for inverting the input first direct current into an alternating current square wave signal of a certain frequency.

Optionally, the onboard power transformation unit includes a three-phase rectifier circuit, an inverter bridge circuit, a step-up transformer and an onboard control circuit, wherein:

The input terminal of the three-phase rectification circuit is connected to the high-power generator, and is used to convert the three-phase alternating current into a second direct current;

The input end of the inverter bridge circuit is connected to the output end of the three-phase rectifier circuit, and the control end is connected to the output end of the on-board control circuit, which is used to control the output signal of the on-board control circuit. The second direct current is converted into a second single-phase alternating current;

The input end of the step-up transformer is connected to the output end of the inverter bridge circuit, and is used to convert the second single-phase alternating current into the first single-phase alternating current;

Optionally, the onboard substation unit also includes a carrier modulator and a host computer, wherein:

The input end of the carrier modulator is connected to the output end of the step-up transformer, and the output end is connected to the input end of the host computer;

The output end of the host computer is connected with the input end of the on-board control circuit;

Optionally, the underwater power transformation unit includes: a single-phase rectification circuit, a waveform tracking control circuit, a DC/DC converter, an underwater control circuit and a transmitting bridge, wherein:

The input end of the single-phase rectification circuit is connected to the first single-phase alternating current, and the output end is connected to the waveform tracking control circuit for converting the first single-phase alternating current into a third direct current;

The output end of the waveform tracking control circuit is connected to the input end of the DC/DC converter, and the control end is connected to the output end of the underwater control circuit for controlling the underwater control circuit. filtering the third direct current;

The output end of the DC/DC converter is connected to the input end of the launch bridge, and the control end is connected to the output end of the underwater control circuit, which is used to control the underwater control circuit. The third direct current is converted into the fourth direct current;

The output terminal of the transmitting bridge is connected to the transmitting electrode, and the control terminal is connected to the output terminal of the underwater control circuit, which is used to convert the fourth direct current into First DC.

Optionally, the waveform tracking control circuit includes: an inductor L, a switch module S, a diode D, a capacitor C, a voltage tracking subunit, and a current tracking subunit, wherein:

The first end of the switch module S is connected to the first output end of the single-phase rectification circuit through the inductor L; the second end is connected to the second output end of the single-phase rectification circuit, and the control end is connected to the current tracking the output of the subunit;

The anode of the diode D is connected to the first end of the switch module S, and the cathode is connected to the first end of the capacitor C; the second end of the capacitor C is connected to the second end of the switch module S;

The first input terminal of the voltage tracking subunit inputs the voltage across the capacitor C, the second input terminal inputs a given voltage, and its output terminal is connected to the first input terminal of the current tracking subunit;

The second input terminal of the current tracking subunit inputs the voltage of the input terminal of the inductor L, and the output terminal is connected to the control terminal of the switch module S;

Optionally, the DC/DC converter includes: a first branch subunit, a second branch subunit, a third branch subunit, an isolation subunit, a rectifier bridge subunit, and a filter subunit, wherein:

The first branch subunit, the second branch subunit and the third branch subunit are connected in parallel to the first parallel terminal and the second parallel terminal; and the first parallel terminal is connected to the waveform tracking control circuit a first output terminal, the second parallel terminal is connected to the second output terminal of the waveform tracking control circuit;

The output end of the first branch subunit is respectively connected to the input end of the second branch subunit and the input end of the third branch subunit;

The first input end of the isolation subunit is connected to the output end of the second branch subunit, and the second input end is connected to the output end of the third branch subunit; the first output end is connected to the rectifier The first input end of the bridge subunit is connected, and the second output end is connected with the second input end of the rectification bridge subunit;

The first output end of the rectifier bridge subunit is connected to the first input end of the filtering subunit, and the second output end is connected to the second input end of the filtering subunit.

Optionally, the first branch subunit includes a capacitor C1 and a capacitor C2, where:

The first end of the capacitor C1 is connected to the first output end of the waveform tracking control circuit, and the second end is connected to the first end of the capacitor C2; the second end of the capacitor C2 is connected to the waveform tracking control circuit. The second output terminals of the tracking control circuit are connected together.

Optionally, the second branch subunit and the third branch subunit adopt the same circuit topology, and the second branch subunit includes: a switch module Q1, a switch module Q2, a switch module Q3, and a switch module Q4 , diode DC1 and diode DC2, where:

The first end of the switch module Q1 is connected to the first output end of the waveform tracking control circuit, the second end is connected in series with the switch module Q2, the switch module Q3 and the switch module Q4 in sequence, and the switch The second end of the module Q4 is connected to the second output end of the waveform tracking control circuit;

Optionally, the switch module Q1, the switch module Q2, the switch module Q3 and the switch module Q4 adopt the same circuit topology; the switch module Q1 includes a transistor T1, a bleeder diode and a bleeder capacitor , wherein the cathode of the bleeder diode is connected to the first end of the transistor T1, and the anode is connected to the second end of the transistor T1; the first end of the bleeder capacitor is connected to the first end of the transistor T1 connected, and the second terminal is connected to the second terminal of the transistor T1.

Optionally, the filter subunit includes a capacitor Cf and an inductor Lf; the first end of the inductor Lf is connected to the first output end of the rectifier bridge subunit, and the second end is connected to the rectifier bridge through the capacitor Cf The second output of the subunit.

The utility model relates to a marine controllable source electromagnetic emission system. The substation unit on the ship rectifies and inverts the three-phase alternating current generated by the generator into a single-phase alternating current with adjustable amplitude of 0-3500V/50Hz, which is the underwater part. Provide raw electric energy; after the underwater substation unit rectifies the AC power of the single unit and performs waveform tracking and correction, it is converted into a frequency-adjustable square wave AC through the transmitting bridge, and the electric energy is excited into the seawater medium through the dipole of the transmitting bridge. The utility model has the characteristics of low switching loss, high power factor, small voltage stress, high power, small size and light weight.

Description of drawings

The features and advantages of the present utility model can be more clearly understood by referring to the accompanying drawings. The accompanying drawings are schematic and should not be construed as any limitation to the present utility model. In the accompanying drawings:

Fig. 1 is a structural block diagram of a marine controllable source emission system provided by an embodiment of the present invention;

Fig. 2 is the waveform tracking control circuit diagram that the utility model embodiment provides;

Fig. 3 is a circuit diagram of a DC/DC converter provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram of a transmitting bridge circuit provided by an embodiment of the present invention;

Fig. 5 is a schematic diagram of the drive signal and output waveform of the transmitting bridge circuit shown in Fig. 4

Fig. 6 is a structure diagram of the transmitting bridge dipole provided by the embodiment of the present invention.

detailed description

Below in conjunction with accompanying drawing and embodiment, the specific embodiment of the utility model is described in further detail. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

The embodiment of the utility model provides a marine controllable source emission system, as shown in Figure 1, including a high-power generator 100 for generating three-phase alternating current, and also includes: a shipboard power conversion unit 200, an underwater power conversion unit 300 and emitter electrode 400, wherein:

The input end of the on-board power conversion unit 200 is connected to the high-power generator 100 for converting the input three-phase alternating current into the first single-phase alternating current;

The input end of the underwater power transformation unit 300 is connected to the output end of the onboard power transformation unit 200, for converting the first single-phase alternating current into the first direct current;

The input end of the emitter electrode 400 is connected to the output end of the underwater power transformation unit 300 for inverting the input first direct current into an alternating current square wave signal of a certain frequency.

As shown in Figure 1, the on-board power transformation unit 200 includes a three-phase rectifier circuit 201, an inverter bridge circuit 202, a step-up transformer 203 and an on-board control circuit 204, wherein:

The input terminal of the three-phase rectification circuit 201 is connected with the high-power generator 100, and is used for converting the three-phase alternating current into a second direct current;

The input end of the inverter bridge circuit 202 is connected to the output end of the three-phase rectifier circuit 201, and the control end is connected to the output end of the onboard control circuit 204, for converting the second direct current under the control of the output signal of the onboard control circuit 204 into the second single-phase alternating current;

The input terminal of the step-up transformer 203 is connected to the output terminal of the inverter bridge circuit 202, and is used for converting the second single-phase AC power into the first single-phase AC power.

The onboard control circuit 204 needs to output a corresponding trigger signal according to the inverter bridge circuit 202 . It should be noted that the on-board control circuit 204 can be realized by using the control circuit in the prior art, and only need to change the input parameters accordingly to change the duty cycle of the output trigger signal, and those skilled in the art can choose the corresponding control circuit to realize, The utility model is not limited.

Preferably, the onboard substation unit 200 also includes a carrier modulator 205 and a host computer 206, wherein:

The input end of the carrier modulator 205 is connected with the output end of the step-up transformer 204, and the output end is connected with the input end of the upper computer 206;

The output end of the upper computer 206 is connected with the input end of the control circuit 204 on board.

It should be noted that, in the embodiment of the present utility model, the carrier modulator 205 transmits the corresponding data of the upper computer 206 to the underwater substation unit 300 through the deep towing cable, so as to adjust the output voltage of the underwater substation unit, thereby adjusting the emission The AC square wave signal of the electrode 400. Of course, the carrier modulator 205 can also collect the signal of the underwater substation unit and transmit it to the onboard substation unit through the deep-tow cable. The embodiment of the utility model can realize the communication between the onboard substation unit and the underwater substation unit through the carrier modulator 205 . In practical applications, the carrier modulator 205 is realized by a communication circuit in the prior art, which is not limited in the present invention.

The working process of the onboard substation unit 200 is:

The high-power generator 100 sends out a three-phase alternating current of 380V/50Hz, and outputs the second direct current to the inverter bridge circuit 202 after being rectified by the three-phase rectifier circuit 201; The variable bridge circuit 204 converts the second direct current into a second single-phase alternating current with an adjustable amplitude of 50 Hz; A single-phase alternating current, so as to provide electric energy for the underwater conversion unit through the deep towing cable. The onboard substation unit 200 performs parameter setting and status monitoring through the host computer 206 , and communicates with the underwater substation unit through the carrier modulator 205 .

As shown in Figure 1, the underwater power transformation unit 300 includes: a single-phase rectification circuit 301, a waveform tracking control circuit 302, a DC/DC converter 303, an underwater control circuit 305 and a transmitting bridge 304, wherein:

The input end of the single-phase rectification circuit 301 is connected to the first single-phase alternating current, and the output end is connected to the waveform tracking control circuit 302 for converting the first single-phase alternating current into a third direct current;

The output terminal of the waveform tracking control circuit 302 is connected with the input terminal of the DC/DC converter 303, and the control terminal is connected with the output terminal of the underwater control circuit 305, for controlling the third direct current under the control of the underwater control circuit 305. filter;

The output end of the DC/DC converter 303 is connected with the input end of the launching bridge 304, and the control end is connected with the output end of the underwater control circuit 305, for converting the third direct current into fourth direct current;

The output terminal of the transmitting bridge 304 is connected to the transmitting electrode 400 , and the control terminal is connected to the output terminal of the underwater control circuit 305 for converting the fourth direct current into the first direct current under the control of the underwater control circuit 305 .

The underwater control circuit 305 needs to output corresponding trigger signals according to the filter tracking circuit 302 , the DC/DC converter 303 and the transmitting bridge 304 . It should be noted that the underwater control circuit 305 can be realized by using the control circuit in the prior art, only need to change the input parameters accordingly to change the duty cycle of the output trigger signal, those skilled in the art can choose the corresponding control circuit to realize , the utility model is not limited.

The underwater substation unit 300 receives 0-3500V/50Hz amplitude-adjustable single-phase alternating current from the deep-tow cable, and converts it into a third direct current through a single-phase rectification circuit. However, since the deep towing cable is often several thousand meters long, its parasitic inductance and bypass capacitance have a serious impact on the AC transmission, resulting in a low power factor of the rectified output and serious waveform distortion. Therefore, it is necessary to use a waveform tracking control circuit to monitor the underwater The substation unit compensates.

As shown in Figure 2, the waveform tracking circuit 302 in the present invention includes an inductor L, a switch module S, a diode D, a capacitor C, a voltage tracking subunit and a current tracking subunit, wherein:

The first end of the switch module S is connected to the first output end of the single-phase rectification circuit through the inductor L; the second end is connected to the second output end of the single-phase rectification circuit, and the control end is connected to the current tracking the output of the subunit;

The anode of the diode D is connected to the first end of the switch module S, and the cathode is connected to the first end of the capacitor C; the second end of the capacitor C is connected to the second end of the switch module S;

The first input terminal of the voltage tracking subunit inputs the voltage across the capacitor C, the second input terminal inputs a given voltage, and its output terminal is connected to the first input terminal of the current tracking subunit;

The voltage of the input terminal of the inductor L is input to the second input terminal of the current tracking subunit, and the output terminal is connected to the control terminal of the switch module S.

The deep towline provides the underwater part with a rectifier circuit to convert it into direct current. However, since the deep towline is often several kilometers long, its parasitic inductance and bypass capacitance have a serious impact on the AC transmission effect, resulting in the rectified output power The factor is low and the waveform distortion is serious, so it is necessary to use a waveform tracking control circuit to compensate it.

It should be noted that, in the present utility model, the current tracking subunit and the voltage tracking subunit are realized by using existing circuits, and those skilled in the art can select the appropriate above-mentioned circuit implementation according to the usage scenario, and the utility model is not limited thereto.

In the embodiment of the utility model, if the capacitor is directly used to filter the third direct current, the power factor is generally 0.5-0.7, and the total harmonic content THD can reach 100%-150%; if a passive filter such as an LC filter is used In the case of an inverter, the power factor can be corrected to 0.95, and the total harmonic content THD is reduced to about 30%. In order to improve the power factor and reduce the total harmonic content to the greatest extent, the utility model adopts the above-mentioned active waveform tracking control circuit, the power factor can be as high as 0.995, and the total harmonic content can be reduced to below 5%, thus completely solving the problem of Harmonic pollution and low power factor of the rectifier circuit.

In practical applications, the transmitting bridge needs low voltage and high current, so the DC/DC converter 303 needs to be used to convert the fourth direct voltage output by the above-mentioned waveform tracking control circuit. As shown in Figure 3, the DC/DC converter 303 in an embodiment of the present invention includes: a first branch subunit 3031, a second branch subunit 3032, a third branch subunit 3033, an isolation subunit 3034, a rectifier bridge Unit 3035 and filtering subunit 3036, wherein:

The first branch subunit 3031, the second branch subunit 3032, and the third branch subunit 3033 are connected in parallel to the first parallel terminal P1 and the second parallel terminal P2; and the first parallel terminal P1 is connected to the first terminal of the waveform tracking control circuit 302 output terminal, the second parallel terminal P2 is connected to the second output terminal of the waveform tracking control circuit 302;

The output end of the first branch subunit 3031 is respectively connected to the input end of the second branch subunit 3032 and the input end of the third branch subunit 3033;

The first input end of the isolation subunit 3034 is connected to the output end of the second branch subunit 3032, and the second input end is connected to the output end of the third branch subunit 3033; the first output end is connected to the output end of the rectifier bridge subunit 3035 The first input end is connected, and the second output end is connected with the second input end of the rectifier bridge subunit 3035;

The first output terminal of the rectifier bridge subunit 3035 is connected to the first input terminal of the filtering subunit 3036 , and the second output terminal is connected to the second input terminal of the filtering subunit 3036 .

In practical applications, as shown in FIG. 3, as a specific embodiment of the first branch subunit 3031, the first branch subunit 3031 includes a capacitor C1 and a capacitor C2, wherein:

The first end of the capacitor C1 is connected to the first output end of the waveform tracking control circuit 302, and the second end is connected to the first end of the capacitor C2; the second end of the capacitor C2 is connected to the second output end of the waveform tracking control circuit 302 connected.

In practical applications, as shown in FIG. 3, as a specific embodiment of the second branch subunit 3032 and the third branch subunit 3033, the second branch subunit 3032 and the third branch subunit 3033 adopt the same circuit topology . The second branch subunit 3032 is used for description below. The second branch subunit 3032 includes: a switch module Q1, a switch module Q2, a switch module Q3, a switch module Q4, a diode DC1 and a diode DC2, wherein:

The first end of the switch module Q1 is connected to the first output end of the waveform tracking control circuit 3032, the second end is connected in series with the switch module Q2, the switch module Q3 and the switch module Q4 in sequence, and the second end of the switch module Q4 is connected to the waveform tracking The second output terminal of the control circuit. Wherein, the switch module Q1, the switch module Q2, the switch module Q3 and the switch module Q4 adopt the same circuit topology. The switch module Q1 includes a transistor T1, a bleeder diode and a bleeder capacitor, wherein the cathode of the bleeder diode is connected to the first end of the transistor T1, and the anode is connected to the second end of the transistor T1; the first end of the bleeder capacitor is connected to the transistor T1 connected to the first end of the transistor T1, and the second end is connected to the second end of the transistor T1.

The rectifier bridge subunit 3035 includes a diode DR1 , a diode DR2 , a diode DR3 and a diode DR4 . The above four diodes form a full-bridge rectifier bridge. It should be noted that the rectifier bridge subunit 3035 in the embodiment of the utility model can be realized by using a commonly used full-wave rectifier bridge, and those skilled in the art can also select a suitable rectifier circuit to realize it according to the specific use occasions. limited.

In practical applications, as shown in Figure 3, as a specific embodiment of the filtering subunit 3036, the filtering subunit 3036 includes a capacitor Cf and an inductor Lf; the first end of the inductor Lf is connected to the first output end of the rectifier bridge subunit, The second terminal is connected to the second output terminal of the rectifier bridge subunit 3035 through the capacitor Cf. The specific parameters of the capacitance Cf and the inductance Lf can be set by those skilled in the art according to specific usage scenarios, which are not limited by the present invention.

In practical application, the voltage stress of the switch tubes in the switch modules Q1-Q4 after the DC/DC converter is adopted in the utility model is half of that of the input third direct current. The output waveform of the converter contains less high-frequency AC components, so the output filter can be reduced. At the same time, its input current pulsation is small, so the input filter can be reduced, and the volume and weight can be further reduced.

In practical applications, in an embodiment of the present invention, the transmitting bridge 304 adopts a circuit structure as shown in FIG. 4 , including a switch module S1 , a switch module S2 , a switch module S3 and a switch module S4 . The switch module S1, the switch module S2, the switch module S3 and the switch module S4 adopt the same circuit topology structure, and adopt the same circuit topology structure as the switch module Q1, which will not be repeated in this utility model. And the input signal and output signal of the transmitting bridge are shown in FIG. 5 .

Finally, the transmitting bridge electrode excites the AC square wave signal sent by the transmitting bridge 3036 into the seawater medium. As shown in FIG. 6 , the transmitting bridge electrode generally includes two electrodes, namely a proximal electrode and a distal electrode, which are 200 meters apart.

To sum up, in the marine controllable source emission system provided by the embodiment of the utility model, the on-board substation unit rectifies, inverts and boosts the three-phase AC generated by the generator into a single-phase AC with adjustable amplitude of 0-3500V/50Hz , to provide raw electric energy for the underwater part; after the underwater substation unit rectifies the AC power of the single machine and performs waveform tracking and correction, it is converted into a frequency-adjustable square wave alternating current through the transmitting bridge, and the electric energy is excited to the seawater through the dipole of the transmitting bridge medium. The utility model has the characteristics of low switching loss, high power factor, small voltage stress, high power, small size and light weight.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise clearly defined.

Although the embodiment of the utility model has been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations all fall into the scope of the present utility model. within the scope of the appended claims.

Claims (10)

1. an ocean controllable source emission system, comprises high-power generator, for generation of three-phase alternating current, it is characterized in that, also comprises: power transformation unit on ship, power transformation unit and emission electrode under water, wherein:

On described ship, the input of power transformation unit is connected with described high-power generator, for converting inputted three-phase alternating current to first single-phase alternating current;

The input of described power transformation under water unit is connected with the output of power transformation unit on described ship, for converting described the first single-phase alternating current to first direct current;

The input of described emission electrode is connected with the output of described power transformation under water unit, for the first inputted DC inverter being become to the ac square wave signal of certain frequency.

2. ocean according to claim 1 controllable source emission system, is characterized in that, on described ship, power transformation unit comprises control circuit on rectified three-phase circuit, inverter bridge circuit, step-up transformer and ship, wherein:

The input of described rectified three-phase circuit is connected with described high-power generator, for three-phase alternating current being converted to the second direct current;

The input of described inverter bridge circuit is connected with the output of described rectified three-phase circuit, control end is connected with the output of control circuit on described ship, for converting described the second direct current to second single-phase alternating current under the control of control circuit output signal on described ship;

The input of described step-up transformer is connected with the output of described inverter bridge circuit, for converting described the second single-phase alternating current to first single-phase alternating current.

3. ocean according to claim 2 controllable source emission system, is characterized in that, on described ship, power transformation unit also comprises carrier modulator and host computer, wherein:

The input of described carrier modulator is connected with the output of described step-up transformer, and output is connected with the input of described host computer;

The output of described host computer is connected with the input of control circuit on described ship.

4. according to the ocean controllable source emission system described in claim 1～3 any one, it is characterized in that, described power transformation under water unit comprises: single phase rectifier circuit, waveform tracking control circuit, DC/DC converter, under water control circuit and transmitting bridge, wherein:

The input of described single phase rectifier circuit connects the first single-phase alternating current, and output is connected with described waveform tracking control circuit, for converting described the first single-phase alternating current to the 3rd direct current;

The output of described waveform tracking control circuit is connected with the input of described DC/DC converter, and control end is connected with the output of described control circuit under water, for described the 3rd direct current being carried out to filtering under the control at described control circuit under water;

The output of described DC/DC converter is connected with the input of described transmitting bridge, and control end is connected with the output of described control circuit under water, for converting described the 3rd direct current to the 4th direct current under the control at described control circuit under water;

The output of described transmitting bridge is connected with described emission electrode, and control end is connected with the output of described control circuit under water, for converting described the 4th direct current to first direct current under the control at described control circuit under water.

5. ocean according to claim 4 controllable source emission system, is characterized in that, described waveform tracking control circuit comprises: inductance L, switch module S, diode D, capacitor C, voltage-tracing subelement and current tracking subelement, wherein:

The first end of described switch module S connects the first output of described single phase rectifier circuit through described inductance L; The second end connects the second output of described single phase rectifier circuit, and control end connects the output of described current tracking subelement;

The first end of switch module S described in the anodic bonding of described diode D, negative electrode connects the first end of described capacitor C; The second end of described capacitor C connects the second end of described switch module S;

The first input end of described voltage-tracing subelement is inputted the both end voltage of described capacitor C, and the second input is inputted given voltage, and its output connects the first input end of described current tracking subelement;

The second input of described current tracking subelement is inputted the voltage of the input of described inductance L, and output connects the control end of described switch module S.

6. ocean according to claim 4 controllable source emission system, it is characterized in that, described DC/DC converter comprises: the first branch road subelement, the second branch road subelement, the 3rd branch road subelement, separaant unit, rectifier bridge subelement and filtering subelement, wherein:

Described the first branch road subelement, described the second branch road subelement and described the 3rd branch road subelement are parallel to the first parallel connected end and the second parallel connected end; And described the first parallel connected end connects the first output of described waveform tracking control circuit, described the second parallel connected end connects the second output of described waveform tracking control circuit;

The output of described the first branch road subelement connects respectively the input of described the second branch road subelement and the input of described the 3rd branch road subelement;

The first input end of described separaant unit is connected with the output of described the second branch road subelement, and the second input is connected with the output of described the 3rd branch road subelement; The first output is connected with the first input end of described rectifier bridge subelement, and the second output is connected with the second input of described rectifier bridge subelement;

The first output of described rectifier bridge subelement is connected with the first input end of described filtering subelement, and the second output is connected with the second input of described filtering subelement.

7. ocean according to claim 6 controllable source emission system, is characterized in that, described the first branch road subelement comprises capacitor C 1 and capacitor C 2, wherein:

The first end of described capacitor C 1 is connected with the first output of described waveform tracking control circuit, and the second end is connected with the first end of described capacitor C 2; The second end of described capacitor C 2 is connected with the second output of described waveform tracking control circuit.

8. ocean according to claim 6 controllable source emission system, it is characterized in that, described the second branch road subelement and described the 3rd branch road subelement adopt identical circuit topological structure, described the second branch road subelement comprises: switch module Q1, switch module Q2, switch module Q3, switch module Q4, diode DC1 and diode DC2, wherein:

The first end of described switch module Q1 connects the first output of described waveform tracking control circuit, the second end is connected successively with described switch module Q2, described switch module Q3 and described switch module Q4, and the second end of described switch module Q4 connects the second output of described waveform tracking control circuit.

9. ocean according to claim 8 controllable source emission system, is characterized in that, described switch module Q1, described switch module Q2, described switch module Q3 adopt identical circuit topological structure with described switch module Q4; Described switch module Q1 comprises transistor T 1, release diode and the electric capacity of releasing, and the negative electrode of the wherein said diode of releasing is connected with the first end of described transistor T 1, and anode is connected with the second end of described transistor T 1; The first end of the described electric capacity of releasing is connected with the first end of described transistor T 1, and the second end is connected with the second end of described transistor T 1.

10. according to the ocean controllable source emission system described in claim 6～9 any one, it is characterized in that, described filtering subelement comprises capacitor C f and inductance L f; The first end of described inductance L f connects the first output of described rectifier bridge subelement, and the second end connects the second output of described rectifier bridge subelement through described capacitor C f.