CN104806364A - Marsh gas generating set load dynamic control system and method - Google Patents

Abstract

The biogas generating set load dynamic control system includes a control unit and a biogas pressure sampling unit; the biogas pressure sampling unit is used to collect the biogas pressure in the gas storage container in real time and generate a corresponding biogas pressure electrical signal P; The biogas pressure electrical signal P within a period of time is assumed to calculate and obtain the biogas pressure change rate K; the control unit dynamically adjusts the current load power of the biogas generator set according to the biogas pressure electrical signal and the biogas pressure change rate K. The invention can dynamically adjust the load output power of the generating set by comprehensively combining the amount of biogas, the change trend of the amount of biogas and the load of the generating set, so as to avoid frequent starting and sudden stop and sudden start of the generating set. The invention also relates to related methods.

Description

Dynamic load control system and method for biogas generator set

technical fields

The invention relates to a load dynamic control system and method of a biogas generator set.

Background technique

Biogas power generation is widely used in sewage treatment industry, landfill, coal mine gas power generation, large farms, natural gas distributed energy and other fields.

At present, there are two main types of biogas power generation load control: one is to adjust the load output of the generator according to the electricity demand of the user end. This type of control method is not affected by the gas source, and the gas volume needs to be stable and sufficient. It is mainly used in Distributed energy field. The other is to determine the load output of the generator according to the amount of gas. This type of control is characterized by limited gas supply and large fluctuations in the amount of gas in different time periods. It is mainly used in sewage anaerobic biogas power generation , landfill gas power generation, coal mine gas power generation and other fields.

For the latter type of load control mode, the load control of biogas power generation usually uses the intake pressure at the intake end of the gas generator set as the control signal. Fast and short response time, but such a system cannot predict the trend of gas changes, and cannot reasonably plan the generator load within a certain period of time. Sewage biogas is a product of the anaerobic section of sewage treatment, and its output is affected by the sewage Affected by many factors such as water volume and anaerobic process, the biogas production fluctuates greatly. The fluctuation of biogas production will inevitably lead to the fluctuation of the load of the biogas generator set, which will lead to frequent start and stop of the generator and affect the normal and stable operation of the generator set.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention aims to provide a load dynamic control system and method of a biogas generating set that can solve the above technical problems.

To achieve the above object, the present invention adopts the following technical solutions:

A load dynamic control system for a biogas generating set, which includes a control unit and a biogas pressure sampling unit;

The biogas pressure sampling unit is used to collect the biogas pressure in the gas storage container in real time, and generate a corresponding biogas pressure electrical signal P;

The control unit calculates and obtains the biogas pressure change rate K according to the biogas pressure electrical signal within a preset time period;

The control unit dynamically adjusts the current load power of the biogas generator set according to the biogas pressure electrical signal P and the biogas pressure change rate K.

Preferably, the control unit is preset with a first change rate threshold K1, a second change rate threshold K2 and a third change rate threshold K3, wherein K1<K2<K3;

The control unit judges whether the biogas pressure change rate K is less than the first change rate threshold K1, or is between the first change rate threshold K1 and the second change rate threshold K2, or is between the second change rate threshold K2 and the third change rate threshold Between K3, still greater than the third change rate threshold K3;

If the biogas pressure change rate K is less than the first change rate threshold K1, the control unit does not start the biogas generator set;

If the biogas pressure change rate K is between the first change rate threshold K1 and the second change rate threshold K2, the controller starts the low-power generating set, and dynamically adjusts the load power of the low-power generating set according to the biogas pressure electrical signal P;

If the biogas pressure change rate K is between the second change rate threshold K2 and the third change rate threshold K3, the controller starts the high-power generator set of the biogas generator set, and dynamically adjusts the load of the high-power generator set according to the biogas pressure electrical signal P power;

If the biogas pressure change rate K is greater than the third change rate threshold K3, the controller starts the high-power generating set, and after a preset delay time, starts the low-power generating set, and dynamically adjusts the biogas generating set according to the biogas pressure electrical signal P load power.

Preferably, the control unit is preset with a first pressure signal threshold P1, and the controller judges whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, or is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1 ; If the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, the controller continues to increase the load power of the low-power generating set; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, the controller maintains low-power power generation The current load power of the unit; if the biogas pressure electrical signal P is less than the first pressure signal threshold P1, the controller reduces the load power of the low-power generator set at a preset ratio.

Preferably, the control unit is preset with a first pressure signal threshold P1, and the controller judges whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, or is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1 ; If the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, the controller continues to increase the load power of the high-power generator set; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, the controller maintains the high-power generator set The current load power; if the biogas pressure electrical signal P is less than the first pressure signal threshold P1, the controller reduces the load power of the high-power generating set at a preset ratio.

Preferably, the control unit is preset with a first pressure signal threshold P1, and the controller judges whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, or is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1 ; If the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, the controller continues to increase the load power of the biogas generator set; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, the controller maintains the current biogas generator set Load power; if the biogas pressure electrical signal P is less than the first pressure signal threshold P1, the controller reduces the load power of the biogas generating set at a preset ratio.

A load dynamic control method for a biogas generating set, comprising the following steps:

Step S1: Obtain the biogas pressure electrical signal P, and calculate and obtain the biogas pressure change rate K according to the biogas pressure electrical signal within a preset time period; and

Step S2: Dynamically adjust the current load power of the generator set according to the biogas pressure electrical signal P and the biogas pressure change rate K.

Preferably, step S2 includes the following sub-steps:

Step A: Determine whether the biogas pressure change rate K is less than the first change rate threshold K1, or between the first change rate threshold K1 and the second change rate threshold K2, or between the second change rate threshold K2 and the third change rate threshold Between K3, still greater than the third change rate threshold K3; biogas pressure change rate K is less than the first change rate threshold K1, perform step B; if the biogas pressure change rate K is between the first change rate threshold K1 and the second change rate threshold Between K2, perform step C; if the biogas pressure change rate K is between the second change rate threshold K2 and the third change rate threshold K3, perform step E; if the biogas pressure change rate K is greater than the third change rate threshold K3, perform step G;

Step B: do not start the biogas generating set;

Step C: start the low-power generating set;

Step D: Dynamically adjust the load power of the low-power generating set according to the biogas pressure electrical signal P;

Step E: start the high-power generating set;

Step F: Dynamically adjust the load power of the high-power generating set according to the biogas pressure electrical signal P;

Step G: start the high-power generating set;

Step H: After a preset delay time, start the low-power generating set; and

Step I: Dynamically adjust the load power of the biogas generator set according to the biogas pressure electrical signal P.

Preferably, step D includes the following sub-steps:

Step D1: Determine whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1; if the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, Execute step D2; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, execute step D3; if the biogas pressure electrical signal P is smaller than the first pressure signal threshold P1, execute step D4;

Step D2: increasing the load power of the low-power generator set at a preset ratio;

Step D3: maintaining the current load power of the low-power generating set; and

Step D4: Reduce the load power of the low-power generating set at a preset ratio.

Step F includes the following sub-steps:

Step F1: Determine whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1; if the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, Execute step F2; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, execute step F3; if the biogas pressure electrical signal P is smaller than the first pressure signal threshold P1, execute step F4;

Step F2: increasing the load power of the high-power generating set at a preset ratio;

Step F3: maintaining the current load power of the high-power generating set; and

Step F4: Reduce the load power of the high-power generating set at a preset ratio.

Preferably, step 1 includes the following sub-steps:

Step I1: Determine whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1; if the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, Execute step I2; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, execute step I3; if the biogas pressure electrical signal P is smaller than the first pressure signal threshold P1, execute step I4.

Step I2: increasing the load power of the biogas generating set at a preset ratio;

Step I3: maintaining the current load power of the low-power biogas generator set; and

Step I4: Reduce the load power of the biogas generating set at a preset ratio.

The beneficial effects of the present invention are at least as follows:

The invention can dynamically adjust the load output power of the generating set by comprehensively combining the amount of biogas, the change trend of the amount of biogas and the load of the generating set, so as to avoid frequent starting and sudden stop and sudden start of the generating set.

Description of drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of a load dynamic control system for a biogas generator set according to the present invention.

Fig. 2 is a main flow chart of a preferred embodiment of the load dynamic control method of the biogas generating set of the present invention.

Fig. 3 is a flow chart of the sub-steps of the load dynamic control method of the biogas generator set in Fig. 2 .

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the present invention will be further described:

Please refer to Fig. 1 , the present invention relates to a load dynamic control system of a biogas generating set, and its preferred embodiment includes a control unit and a biogas pressure sampling unit.

The biogas pressure sampling unit is used to collect the biogas pressure in the gas storage container in real time, and generate a corresponding biogas pressure electrical signal P;

The control unit calculates and obtains the biogas pressure change rate K (that is, the change value of the biogas pressure per second) according to the biogas pressure electrical signal within the preset time period. Indirect indication of the amount of gas stored in the gas storage container;

The control unit dynamically adjusts the current load power of the biogas generator set according to the biogas pressure electrical signal P and the biogas pressure change rate K.

In this way, the present invention can dynamically adjust the load output power of the generator set in combination with the amount of biogas, the change trend of the biogas amount, and the load of the generator set, so as to avoid frequent starts and sudden stops of the generator set.

In this embodiment, the control unit is preset with a first change rate threshold K1, a second change rate threshold K2 and a third change rate threshold K3, wherein K1<K2<K3; the control unit is also preset with a first pressure signal Threshold P1.

The control unit judges whether the biogas pressure change rate K is less than the first change rate threshold K1, or is between the first change rate threshold K1 and the second change rate threshold K2, or is between the second change rate threshold K2 and the third change rate threshold Between K3, still greater than the third change rate threshold K3;

If the biogas pressure change rate K is less than the first change rate threshold K1, it means that the gas volume in the gas storage container is too low to maintain the low-load operation of the biogas generator set, and the control unit does not start the biogas generator set.

If the biogas pressure change rate K is between the first change rate threshold K1 and the second change rate threshold K2, it means that the gas volume in the gas storage container is low, and the low-power generator set in the biogas generator set can be maintained at a load of more than 50%. run. The controller starts the low-power generating set, and dynamically adjusts the load power of the small-power generating set according to the biogas pressure electrical signal P;

Specifically, the controller judges whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1; if the biogas pressure electrical signal P is greater than the first pressure signal Threshold P1, the controller continues to increase the load power of the low-power generator set; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, the controller maintains the current load power of the low-power generator set; if the biogas pressure electrical signal P is less than The first pressure signal threshold P1, the controller reduces the load power of the low-power generating set at a preset ratio.

Preferably, the system also includes a biogas pretreatment device, the controller detects the pressure signal P8 of the gas outlet of the biogas pretreatment device and the pressure signal P9 of the inlet port of the biogas generator set, and judges whether the pressure signal P8 is smaller than the pressure signal P9, If so, do not start the low-power generating set; if not, start the low-power generating set.

If the rate of change of biogas pressure K is between the second rate of change threshold K2 and the third rate of change threshold K3, it means that the gas volume in the gas storage container is relatively large and can maintain the operation of the high-power generating set with a load of more than 50%; the controller starts the biogas The high-power generator set of the generator set dynamically adjusts the load power of the high-power generator set according to the biogas pressure electrical signal P;

Specifically, the controller judges whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, or is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1, or is greater than or equal to the second pressure signal threshold P2; If the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, the controller continues to increase the load power of the high-power generating set; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, the controller maintains the current pressure of the high-power generating set load power; if the biogas pressure electrical signal P is less than the first pressure signal threshold P1, the controller reduces the load power of the high-power generating set at a preset ratio.

If the biogas pressure change rate K is greater than the third change rate threshold K3, it means that the gas volume in the gas storage container is large. The electric signal P dynamically adjusts the load power of the biogas generator set (including high-power generator set and low-power generator set);

Specifically, the controller judges whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1; if the biogas pressure electrical signal P is greater than the first pressure signal Threshold P1, the controller continues to increase the load power of the biogas generator set; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, the controller maintains the current load power of the biogas generator set; if the biogas pressure electrical signal P is less than the first pressure signal threshold P1 Pressure signal threshold P1, the controller reduces the load power of the biogas generating set at a preset ratio.

In this way, the present invention can not only quickly adjust the load of the generator, but also predict the change of the gas volume of the biogas, so as to determine the appropriate load for power generation, ensure the continuity and high efficiency of the generator operation, and avoid frequent start-up and stop affecting the generator set lifespan.

In other embodiments, the present invention also includes a generator set operating load sampling device for sampling the load power of the biogas generator set;

Preferably, if the biogas pressure electrical signal P is less than the first pressure signal threshold P1, the controller reduces the load power of the biogas generating set at a preset ratio, and when the load power of the biogas generating set is less than the preset load power threshold such as 50%, , do not start the biogas generator set.

The above-mentioned control unit may include a controller and a generator set parallel control system, the controller is used to process the above-mentioned collection parameters, judgment algorithms and send execution signals according to the judgment results; the generator set parallel control system is used to correspondingly drive the biogas generator set according to the execution signals running.

Preferably, the controller is also preset with a second biogas pressure signal threshold P2 and a third biogas pressure signal threshold P3, and P3>P2>P1; when the biogas pressure signal is greater than the third biogas pressure signal threshold P3, the controller The gas in the gas storage container is consumed by a biogas burning torch to reduce the biogas pressure signal until the gas pressure signal is equal to the second biogas pressure signal threshold P2, and the biogas burning torch is turned off.

Referring to Figure 2, a load dynamic control method for a biogas generating set is applied to the above control unit, including the following steps:

Step S1: Obtain the biogas pressure electrical signal P, and calculate and obtain the biogas pressure change rate K according to the biogas pressure electrical signal within a preset time period; and

Step S2: Dynamically adjust the current load power of the generator set according to the biogas pressure electrical signal P and the biogas pressure change rate K.

In this embodiment, step S2 includes the following sub-steps:

Step A: Determine whether the biogas pressure change rate K is less than the first change rate threshold K1, or between the first change rate threshold K1 and the second change rate threshold K2, or between the second change rate threshold K2 and the third change rate threshold Between K3, still greater than the third change rate threshold K3; biogas pressure change rate K is less than the first change rate threshold K1, perform step B; if the biogas pressure change rate K is between the first change rate threshold K1 and the second change rate threshold Between K2, perform step C; if the biogas pressure change rate K is between the second change rate threshold K2 and the third change rate threshold K3, perform step E; if the biogas pressure change rate K is greater than the third change rate threshold K3, perform step g.

Step B: do not start the biogas generating set;

Step C: start the low-power generating set;

Step D: Dynamically adjust the load power of the low-power generating set according to the electrical signal P of biogas pressure.

Referring to Fig. 3, step D comprises the following sub-steps:

Step D1: Determine whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1; if the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, Execute step D2; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, execute step D3; if the biogas pressure electrical signal P is smaller than the first pressure signal threshold P1, execute step D4.

Step D2: increasing the load power of the low-power generator set at a preset ratio;

Step D3: maintaining the current load power of the low-power generating set; and

Step D4: Reduce the load power of the low-power generating set at a preset ratio.

Step E: start the high-power generating set;

Step F: Dynamically adjust the load power of the high-power generating set according to the electrical signal P of biogas pressure.

Preferably, step F includes the following sub-steps:

Step F1: Determine whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1; if the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, Execute step F2; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, execute step F3; if the biogas pressure electrical signal P is smaller than the first pressure signal threshold P1, execute step F4;

Step F2: increasing the load power of the high-power generating set at a preset ratio;

Step F3: maintaining the current load power of the high-power generating set;

Step F4: Reduce the load power of the high-power generating set at a preset ratio.

Step G: start the high-power generating set;

Step H: After a preset delay time, start the low-power generating set;

Step I: Dynamically adjust the load power of the biogas generator set according to the biogas pressure electrical signal P.

Preferably, step 1 includes the following sub-steps:

Step I1: Determine whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1; if the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, Execute step I2; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, execute step I3; if the biogas pressure electrical signal P is smaller than the first pressure signal threshold P1, execute step I4.

Step I2: increasing the load power of the biogas generating set at a preset ratio;

Step I3: maintaining the current load power of the low-power biogas generating set;

Step I4: Reduce the load power of the biogas generating set at a preset ratio.

For those skilled in the art, various other corresponding changes and modifications can be made according to the technical solutions and ideas described above, and all these changes and modifications should fall within the protection scope of the claims of the present invention.

Claims (10)

1. A biogas generating set load dynamic control system, characterized in that: it comprises a control unit and a biogas pressure sampling unit; The biogas pressure sampling unit is used to collect the biogas pressure in the gas storage container in real time, and generate a corresponding biogas pressure electrical signal P; The control unit calculates and acquires the biogas pressure change rate K according to the biogas pressure electrical signal P within a preset time period; The control unit dynamically adjusts the current load power of the biogas generator set according to the biogas pressure electrical signal P and the biogas pressure change rate K. 2. The load dynamic control system of biogas generator set according to claim 1, characterized in that: the control unit is preset with a first change rate threshold K1, a second change rate threshold K2 and a third change rate threshold K3, wherein, K1<K2<K3; The control unit judges whether the biogas pressure change rate K is less than the first change rate threshold K1, or is between the first change rate threshold K1 and the second change rate threshold K2, or is between the second change rate threshold K2 and the third change rate threshold Between K3, still greater than the third change rate threshold K3; If the biogas pressure change rate K is less than the first change rate threshold K1, the control unit does not start the biogas generator set; If the biogas pressure change rate K is between the first change rate threshold K1 and the second change rate threshold K2, the controller starts the low-power generating set, and dynamically adjusts the load power of the low-power generating set according to the biogas pressure electrical signal P; If the biogas pressure change rate K is between the second change rate threshold K2 and the third change rate threshold K3, the controller starts the high-power generator set of the biogas generator set, and dynamically adjusts the load of the high-power generator set according to the biogas pressure electrical signal P power; If the biogas pressure change rate K is greater than the third change rate threshold K3, the controller starts the high-power generating set, and after a preset delay time, starts the low-power generating set, and dynamically adjusts the biogas generating set according to the biogas pressure electrical signal P load power. 3. The load dynamic control system of biogas generator set according to claim 2, characterized in that: the control unit is preset with a first pressure signal threshold P1, and the controller judges that the biogas pressure electrical signal P is greater than the first pressure signal threshold P1 , is still equal to the first pressure signal threshold P1, or less than the first pressure signal threshold P1; if the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, the controller continues to increase the load power of the low-power generating set; if the biogas pressure The electrical signal P is equal to the first pressure signal threshold P1, and the controller maintains the current load power of the low-power generating set; if the biogas pressure electrical signal P is less than the first pressure signal threshold P1, the controller reduces the low-power generating set at a preset ratio. load power. 4. The load dynamic control system of biogas generator set according to claim 2, characterized in that: the control unit is preset with a first pressure signal threshold P1, and the controller judges that the biogas pressure electrical signal P is greater than the first pressure signal threshold P1 , still equal to the first pressure signal threshold P1, or less than the first pressure signal threshold P1; if the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, the controller continues to increase the load power of the high-power generating set; The signal P is equal to the first pressure signal threshold P1, and the controller maintains the current load power of the high-power generator set; if the biogas pressure electrical signal P is smaller than the first pressure signal threshold P1, the controller reduces the load power of the high-power generator set at a preset ratio. load power. 5. The load dynamic control system of biogas generator set according to claim 2, characterized in that: the control unit is preset with a first pressure signal threshold P1, and the controller judges that the biogas pressure electrical signal P is greater than the first pressure signal threshold P1 , still equal to the first pressure signal threshold P1, or less than the first pressure signal threshold P1; if the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, the controller continues to increase the load power of the biogas generating set; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, and the controller maintains the current load power of the biogas generator set; if the biogas pressure electrical signal P is smaller than the first pressure signal threshold P1, the controller reduces the load power of the biogas generator set at a preset ratio. 6. A biogas generating set load dynamic control method, comprising the following steps: Step S1: Obtain the biogas pressure electrical signal P, and calculate and obtain the biogas pressure change rate K according to the biogas pressure electrical signal within a preset time period; and Step S2: Dynamically adjust the current load power of the generator set according to the biogas pressure electrical signal P and the biogas pressure change rate K. 7. The biogas generating set load dynamic control system as claimed in claim 6, characterized in that: step S2 comprises the following sub-steps: Step A: Determine whether the biogas pressure change rate K is less than the first change rate threshold K1, or between the first change rate threshold K1 and the second change rate threshold K2, or between the second change rate threshold K2 and the third change rate threshold Between K3, still greater than the third change rate threshold K3; biogas pressure change rate K is less than the first change rate threshold K1, perform step B; if the biogas pressure change rate K is between the first change rate threshold K1 and the second change rate threshold Between K2, perform step C; if the biogas pressure change rate K is between the second change rate threshold K2 and the third change rate threshold K3, perform step E; if the biogas pressure change rate K is greater than the third change rate threshold K3, perform step G; Step B: do not start the biogas generating set; Step C: start the low-power generating set; Step D: Dynamically adjust the load power of the low-power generating set according to the biogas pressure electrical signal P; Step E: start the high-power generating set; Step F: Dynamically adjust the load power of the high-power generating set according to the biogas pressure electrical signal P; Step G: start the high-power generating set; Step H: After a preset delay time, start the low-power generating set; and Step I: Dynamically adjust the load power of the biogas generator set according to the biogas pressure electrical signal P. 8. The biogas generating set load dynamic control system as claimed in claim 7, wherein step D comprises the following sub-steps: Step D1: Determine whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1; if the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, Execute step D2; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, execute step D3; if the biogas pressure electrical signal P is smaller than the first pressure signal threshold P1, execute step D4; Step D2: increasing the load power of the low-power generator set at a preset ratio; Step D3: maintaining the current load power of the low-power generating set; and Step D4: Reduce the load power of the low-power generating set at a preset ratio. 9. The biogas generating set load dynamic control system as claimed in claim 7, characterized in that: step F comprises the following sub-steps: Step F1: Determine whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, or is equal to the first pressure signal threshold P1, or is smaller than the first pressure signal threshold P1; If the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, execute step F2; If the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, execute step F3; If the biogas pressure electrical signal P is less than the first pressure signal threshold P1, execute step F4; Step F2: increasing the load power of the high-power generating set at a preset ratio; Step F3: maintaining the current load power of the high-power generating set; and Step F4: Reduce the load power of the high-power generating set at a preset ratio. 10. biogas generating set load dynamic control system as claimed in claim 7, is characterized in that: step 1 comprises the following sub-steps: Step I1: Determine whether the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, or equal to the first pressure signal threshold P1, or less than the first pressure signal threshold P1; if the biogas pressure electrical signal P is greater than the first pressure signal threshold P1, Execute step I2; if the biogas pressure electrical signal P is equal to the first pressure signal threshold P1, execute step I3; if the biogas pressure electrical signal P is smaller than the first pressure signal threshold P1, execute step I4; Step I2: increasing the load power of the biogas generating set at a preset ratio; Step I3: maintaining the current load power of the low-power biogas generator set; and Step I4: Reduce the load power of the biogas generating set at a preset ratio.