CN114928038A - Electric energy generation method and electric energy conversion system - Google Patents

Electric energy generation method and electric energy conversion system Download PDF

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Publication number
CN114928038A
CN114928038A CN202210598577.1A CN202210598577A CN114928038A CN 114928038 A CN114928038 A CN 114928038A CN 202210598577 A CN202210598577 A CN 202210598577A CN 114928038 A CN114928038 A CN 114928038A
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China
Prior art keywords
voltage
direct current
bus
converter
asynchronous generator
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Pending
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CN202210598577.1A
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Chinese (zh)
Inventor
吕春野
刘立伟
马同超
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Siemens Ltd China
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Siemens Ltd China
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Priority to CN202210598577.1A priority Critical patent/CN114928038A/en
Publication of CN114928038A publication Critical patent/CN114928038A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/109—Scheduling or re-scheduling the operation of the DC sources in a particular order, e.g. connecting or disconnecting the sources in sequential, alternating or in subsets, to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/14—Balancing the load in a network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The invention provides an electric energy generation method, which comprises the following steps: setting an alternating current/direct current converter for each asynchronous generator set and connecting a direct current bus; starting an asynchronous generator set, actively increasing the rotating speed to a grid-connected rotating speed set point, or passively waiting for the rotating speed to exceed the grid-connected rotating speed set point and starting a power generation system; presetting voltage set values of all alternating current/direct current converters; starting each alternating current/direct current converter, and providing electric energy for direct current electric equipment through a direct current bus; and controlling each alternating current/direct current converter by using a droop control principle, stabilizing the direct current bus voltage and balancing the load of each asynchronous generator set. The electric energy generation method provided by the invention can generate electricity through the asynchronous generator set under the condition of unstable frequency and voltage of the generator. The invention also relates to an electric energy conversion system using the electric energy generation method.

Description

Electric energy generation method and electric energy conversion system
Technical Field
The invention relates to an electric energy generation method, in particular to an electric energy generation method by using an asynchronous generator set. The invention also relates to an electric energy conversion system using the electric energy generation method.
Background
When the mechanical load of the shafting acting equipment is low, in order to keep the best prime mover efficiency, redundant prime mover mechanical energy can be converted into electric energy, however, when the asynchronous generator set is used for energy generation, because the shafting acting equipment works in a wide rotating speed range, the asynchronous generator set cannot provide an alternating current power supply with stable frequency, and therefore the asynchronous generator set cannot be used in a grid-connected alternating current power grid.
Disclosure of Invention
The invention aims to provide an electric energy generation method which can be used for energy generation through an asynchronous generator set.
Another object of the present invention is to provide an electric energy conversion system capable of energy generation and use by an asynchronous generator set.
The invention provides an electric energy generation method, which comprises the following steps:
setting an alternating current/direct current converter for each asynchronous generator set and connecting a direct current bus;
starting an asynchronous generator set, actively increasing the rotating speed to a grid-connected rotating speed set point, or passively waiting for the rotating speed to exceed the grid-connected rotating speed set point and starting a power generation system;
presetting voltage set values of all alternating current/direct current converters;
starting each alternating current/direct current converter, and providing electric energy for direct current electric equipment through a direct current bus; and
and controlling each alternating current/direct current converter by using a droop control principle, stabilizing the direct current bus voltage and balancing the load of each asynchronous generator set.
According to the electric energy generation method provided by the invention, alternating current electric energy generated by a plurality of asynchronous generator sets is converted into direct current electric energy with controllable voltage by virtue of the alternating current/direct current converters, then the direct current electric energy is merged into a direct current bus to provide electric loads for direct current electric equipment, and the droop control principle is further utilized to control each alternating current/direct current converter, stabilize the voltage of the direct current bus and balance the loads of each asynchronous generator set. Therefore, the electric energy generation method provided by the invention can be used for generating energy and using the energy through the asynchronous generator set. Of course, the method for generating electric energy is also suitable for power generation application occasions where the rotation speed of the prime motor does not need to be accurately controlled or the optimal energy consumption needs to be controlled according to load change.
In another exemplary embodiment of the method for generating electrical energy, the steps of: presetting voltage set values of each alternating current/direct current converter, specifically comprising the following steps:
setting a direct current bus reference voltage and a maximum deviation value;
acquiring real-time voltage of the direct current bus, and calculating and judging whether the difference value between the reference voltage of the direct current bus and the real-time voltage of the direct current bus is greater than the maximum deviation value;
if so, setting the voltage set value of the AC/DC converter as the reference voltage of the DC bus; and
if not, the voltage set value of the alternating current/direct current converter is set as the real-time voltage of the direct current bus.
In yet another exemplary embodiment of the method for generating electrical energy, the steps of: the method for controlling the alternating current/direct current converters by using the droop control principle to stabilize the direct current bus voltage and balance the loads of the asynchronous generator sets specifically comprises the following steps:
presetting a load percentage-droop voltage compensation value curve of each asynchronous generator set;
switching the voltage set value of each alternating current/direct current converter into the sum of the direct current bus reference voltage and the droop voltage compensation value of each asynchronous generator set;
calculating droop voltage compensation values and voltage set values of the alternating current/direct current converters according to the real-time load percentage and the load percentage-droop voltage compensation value curve of each asynchronous generator set; and
and the alternating current/direct current converter automatically adjusts the rotating speed of the asynchronous generator set according to the load requirement of the asynchronous generator set and the optimal efficiency curve.
In still another exemplary embodiment of the power generation method, the load percentage-droop voltage compensation value curve is set such that the droop voltage compensation value reaches its maximum value at a load percentage of 0% and 0 at a load percentage of 100%.
In still another exemplary embodiment of the power generation method, the power generation method further includes the steps of: and a direct current/alternating current converter is arranged on the direct current bus, and the direct current/alternating current converter is used for providing electric energy for alternating current electric equipment.
The invention also provides an electric energy conversion system which comprises a plurality of asynchronous generator sets, a plurality of alternating current/direct current converters, a direct current bus and a plurality of controllers. Each asynchronous generator set can be driven by shafting acting equipment. The alternating current/direct current converters control the asynchronous generator sets in a one-to-one correspondence mode, and can convert alternating current electric energy generated by the asynchronous generator sets into direct current electric energy with adjustable voltage. The dc bus can be connected to a plurality of ac/dc converters and used to provide an electrical load for the dc consumer. The controller controls the AC/DC converters in a one-to-one correspondence manner, and is configured to be capable of presetting voltage set values of the AC/DC converters when the asynchronous generator set is started, controlling each AC/DC converter by using a droop control principle, stabilizing DC bus voltage and balancing loads of each asynchronous generator set.
The electric energy conversion system provided by the invention converts alternating current electric energy generated by a plurality of asynchronous generator sets into direct current electric energy with controllable voltage by virtue of the alternating current/direct current converters, then the direct current electric energy is merged into a direct current bus to provide electric energy required by a load for direct current electric equipment, and the controller is further utilized to control each alternating current/direct current converter according to a droop control principle, stabilize the voltage of the direct current bus and balance the load of each asynchronous generator set. The electric energy conversion system provided by the invention can be used for generating energy through the asynchronous generator set. Of course, the power conversion system is also suitable for power generation applications where the rotational speed of the prime mover does not need to be precisely controlled or where optimal power consumption needs to be controlled in response to load changes.
In still another exemplary embodiment of the power conversion system, each controller is configured to obtain a real-time dc bus voltage from the corresponding ac/dc converter, and calculate and determine whether a difference between the dc bus reference voltage and the real-time dc bus voltage is greater than a maximum deviation value according to a preset dc bus reference voltage and the maximum deviation value, if so, control the corresponding ac/dc converter to use the dc bus reference voltage as a voltage setting value, otherwise, control the corresponding ac/dc converter to use the real-time dc bus voltage as a voltage setting value.
In a further exemplary embodiment of the power conversion system, each controller is configured to preset a load percentage-droop voltage compensation value curve of the corresponding asynchronous generator set, and the controller is configured to obtain a real-time load percentage of the asynchronous generator set from the corresponding ac/dc converter, calculate a droop voltage compensation value by combining the load percentage-droop voltage compensation value curve, and control the corresponding ac/dc converter to use a sum of the dc bus reference voltage and the droop voltage compensation value as the voltage setting value.
In still another exemplary embodiment of the power conversion system, in the load percentage-droop voltage compensation value curve preset by each controller, the droop voltage compensation value reaches its maximum value at the load percentage of 0%, and the droop voltage compensation value is 0 at the load percentage of 100%.
In a further exemplary embodiment of the power conversion system, the power conversion system further includes at least one dc/ac converter connected to the dc bus and capable of converting the dc power on the dc bus into parameter controllable ac power.
Drawings
The following drawings are only schematic illustrations and explanations of the present invention, and do not limit the scope of the present invention.
FIG. 1 is a schematic flow diagram of one illustrative embodiment of a method of generating electrical energy.
FIG. 2 is an embodiment schematic of an exemplary embodiment of a method of generating electrical energy.
FIG. 3 is a flow chart illustrating a portion of the steps of a method for generating electrical energy.
FIG. 4 is a flow chart illustrating a portion of the steps of a method for generating electrical energy.
Fig. 5 is a diagram illustrating the relationship between the droop voltage compensation value and the load percentage.
FIG. 6 is a schematic flow diagram of another illustrative embodiment of a method of generating electrical energy.
Description of the reference symbols
10 asynchronous generator set
20 AC/DC converter
30 DC bus
40 controller
50 DC/AC converter
60 direct current electric equipment
70 AC electric equipment
U DMax Maximum value of droop voltage compensation value
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals indicate the same or structurally similar but functionally identical elements.
"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.
FIG. 1 is a schematic flow diagram of one illustrative embodiment of a method of generating electrical energy. FIG. 2 is an embodiment schematic of an exemplary embodiment of a method of generating electrical energy. Referring to fig. 1 and 2, the electric energy generation method is energy-generated by several asynchronous generator sets 10 driven by a shafting work-producing device. Specifically, the electric energy generation method comprises the following steps:
step S10: an ac/dc converter 20 is provided for each asynchronous generator set 10 and is connected to a dc bus 30. The ac/dc converter 20 can convert the ac power with unstable voltage and frequency generated by the asynchronous generator set 10 into dc power with controllable voltage. Compared with the frequency, voltage, phase sequence and other parameters which need to be considered in alternating current grid connection, only one voltage parameter needs to be considered when the direct current electric energy is merged into the direct current bus 30.
Step S20: and starting the asynchronous generator set 10, actively increasing the rotating speed to the set point of the grid-connected rotating speed, or passively waiting for the rotating speed to exceed the set point of the grid-connected rotating speed, and starting the power generation system. And finishing starting when the rotating speed of the asynchronous generator set 10 reaches the grid-connected rotating speed.
Step S30: the voltage set value of each ac/dc converter 20 is preset. FIG. 3 is a flow chart illustrating a portion of the steps of a method for generating electrical energy. Referring to fig. 3, in an exemplary embodiment, step S30 specifically includes the following steps:
step S31: and setting the reference voltage and the maximum deviation value of the direct current bus. The dc bus reference voltage is determined according to the usage requirement of the dc bus 30, and after the dc bus 30 is connected to the dc electric device 60, the actual voltage value of the dc bus 30 is always kept near the dc bus reference voltage. The maximum deviation value is set to determine whether the other ac/dc converters 20 in operation are already integrated on the dc bus 30 before the ac/dc converter 20 is integrated on the dc bus 30.
Step S32: and acquiring the real-time voltage of the direct current bus, and calculating and judging whether the difference value between the reference voltage of the direct current bus and the real-time voltage of the direct current bus is greater than the maximum deviation value.
Step S33: if yes, the voltage set value of the ac/dc converter 20 is set as the dc bus reference voltage. If the difference between the dc bus reference voltage and the dc bus real-time voltage is greater than the maximum deviation value, it means that no other ac/dc converter 20 is connected to the dc bus 30, and the voltage setting value of the first ac/dc converter 20 connected to the dc bus 30 determines the voltage value of the dc bus 30, so that the voltage setting value can be set as the dc bus reference voltage.
Step S34: if not, the voltage set value of the ac/dc converter 20 is set as the real-time voltage of the dc bus. If the difference between the dc bus reference voltage and the dc bus real-time voltage is less than or equal to the maximum deviation value, it indicates that the other operating ac/dc converters 20 are already connected to the dc bus 30, and in order to avoid the voltage difference, the voltage setting value of the ac/dc converter 20 connected to the dc bus 30 is set as the dc bus real-time voltage.
Step S40: each ac/dc converter 20 is activated to provide power to the dc consumers 60 via the dc bus 30. After the ac/dc converter 20 is started, it automatically synchronizes with the asynchronous generator set 10, converts ac power into dc power, and raises the voltage to the voltage set value of the ac/dc converter 20.
Step S50: and controlling each alternating current/direct current converter 20 by using a droop control principle, stabilizing the voltage of the direct current bus 30 and balancing the load of each asynchronous generator set 10. Fig. 4 is a flow chart illustrating a portion of the steps of the method for generating electrical energy. Referring to fig. 4, in an exemplary embodiment, step S50 specifically includes the following steps:
step S51: and presetting a load percentage-droop voltage compensation value curve of each asynchronous generator set 10. Fig. 5 is a diagram illustrating the relationship between the droop voltage compensation value and the load percentage. Referring to fig. 5, the droop voltage compensation value reaches its maximum value U at a load percentage of 0% DMax The droop voltage compensation value is 0 at a load percentage of 100%. The load percentage-droop voltage compensation value curve is generated according to the droop coefficient of each asynchronous generator set 10, the droop coefficient of each asynchronous generator set 10 corresponds to the actual parameter of each asynchronous generator set 10, the load percentage-droop voltage compensation value curve is used for controlling, communication coordination is not needed among the alternating current/direct current converters 20, the alternating current/direct current converters 20 can be subjected to self-adaptive adjustment, and the voltage stability of the direct current bus 30 and the load balance of each asynchronous generator set 10 are guaranteed.
Step S52: and switching the voltage set value of each alternating current/direct current converter 20 into the sum of the direct current bus reference voltage and the droop voltage compensation value of each asynchronous generator set 10.
Step S53: and calculating the droop voltage compensation value and the voltage set value of each AC/DC converter 20 according to the real-time load percentage and the load percentage-droop voltage compensation value curve of each asynchronous generator set 10. Specifically, the real-time load percentage of each asynchronous generator set 10 is obtained through each ac/dc converter 20, the real-time load percentage is substituted into a load percentage-droop voltage compensation value curve to obtain a droop voltage compensation value, and the droop voltage compensation value is added to the dc bus reference voltage to obtain a voltage set value of the ac/dc converter 20.
Step S54: each ac/dc converter 20 controls the rotation speed of each asynchronous generator set 10 according to the voltage set value. The obtained voltage set value is input to the ac/dc converter 20, the ac/dc converter 20 performs internal calculation according to the voltage set value, and the rotation speed of the asynchronous generator set 10 is automatically adjusted according to the load requirement of the asynchronous generator set 10 and the optimal efficiency curve.
According to the electric energy generation method provided by the invention, the alternating current electric energy generated by the asynchronous generator sets 10 is converted into the direct current electric energy with controllable voltage by virtue of the alternating current/direct current converter 20, and then the direct current electric energy is merged into the direct current bus 30 to provide electric energy for electric equipment, and the droop control principle is further utilized to control each alternating current/direct current converter 20, stabilize the voltage of the direct current bus 30 and balance the load of each asynchronous generator set 10. Therefore, the electric energy generation method provided by the invention can be used for generating energy and using the asynchronous generator set 10. Of course, the method is also suitable for power generation applications where the rotational speed of the prime mover does not need to be precisely controlled or where optimal energy consumption needs to be controlled in response to load changes.
FIG. 6 is a schematic flow diagram of another illustrative embodiment of a method of generating electrical energy. Referring to fig. 6, the same or similar parts as those of the power generation method in fig. 1 are not repeated, and the difference therebetween is that the power generation method further includes step S60: a dc/ac converter 50 is provided on the dc bus 30, and ac power is supplied to the ac electric devices 70 through the dc/ac converter 50. The dc/ac converter 50 converts the dc power on the dc bus 30 into ac power with controllable frequency and voltage, which can be used by the ac consumer 70.
The invention also provides an electric energy conversion system, referring to fig. 2, the electric energy conversion system comprises a plurality of asynchronous generator sets 10, a plurality of ac/dc converters 20, a dc bus 30 and a plurality of controllers 40.
Each asynchronous generator set 10 can be driven by a shafting work-applying device. The ac/dc converters 20 control the asynchronous generator sets 10 in a one-to-one correspondence, and can convert ac power generated by the asynchronous generator sets 10 into dc power whose voltage can be adjusted. The dc bus 30 can be connected to a plurality of ac/dc converters 20 and is used to supply the dc consumers 60 with electrical energy. The controller 40 may be a separate device or a functional module of the ac/dc converter 20, which controls the ac/dc converter 20 in a one-to-one correspondence. The controller 40 is configured to be able to preset a voltage setting value of the ac/dc converters 20 at the start of the asynchronous generator set 10, and to control each ac/dc converter 20 using a droop control principle, stabilize the dc bus 30 voltage, and balance the load of each asynchronous generator set 10.
According to the electric energy conversion system provided by the invention, alternating current electric energy generated by a plurality of asynchronous generator sets 10 is converted into direct current electric energy with controllable voltage by virtue of the alternating current/direct current converter 20, and then the direct current electric energy is merged into the direct current bus 30 to provide an electric power supply for electric equipment, and the controller 40 is further utilized to control each alternating current/direct current converter 20 according to a droop control principle, stabilize the voltage of the direct current bus 30 and balance the load of each asynchronous generator set 20. The electric energy conversion system provided by the invention can be used for generating energy through the asynchronous generator set. Of course, the power conversion system is also suitable for power generation applications where the rotational speed of the prime mover does not need to be accurately controlled or where optimal power consumption needs to be controlled according to load changes.
In the exemplary embodiment, each controller 40 is configured to obtain the real-time dc bus voltage from the corresponding ac/dc converter 20, and calculate and determine whether a difference between the reference dc bus voltage and the real-time dc bus voltage is greater than a maximum deviation value according to a preset reference dc bus voltage and the maximum deviation value, if so, the corresponding ac/dc converter 20 is controlled to use the reference dc bus voltage as the voltage setting value, otherwise, the corresponding ac/dc converter 20 is controlled to use the real-time dc bus voltage as the voltage setting value.
In the exemplary embodiment, each controller 40 is configured to be preset with a load percentage-droop voltage compensation value curve for the corresponding asynchronous generator set 10. In the load percentage-droop voltage compensation value curve, the droop voltage compensation value reaches its maximum value U at a load percentage of 0% DMax The droop voltage compensation value is 0 at a load percentage of 100%. The controller 40 is configured to obtain the real-time load percentage of the asynchronous generator set 10 from the corresponding ac/dc converter 20, calculate the droop voltage compensation value according to the load percentage-droop voltage compensation value curve, and control the corresponding ac/dc converter 20 to perform dc bus connectionThe sum of the reference voltage and the droop voltage compensation value is the voltage set value.
In an exemplary embodiment, referring to fig. 2, the power conversion system further comprises at least one dc/ac converter 50 connected to the dc bus 30 and capable of converting the dc power on the dc bus 30 into parameter controllable ac power. The dc/ac converter 50 converts the dc power on the dc bus 30 into ac power with controllable frequency and voltage, which can be used by the ac consumer 70.
It should be understood that although the specification has been described in terms of various embodiments, not every embodiment includes every single embodiment, and such description is for clarity purposes only, and it will be appreciated by those skilled in the art that the specification as a whole can be combined as appropriate to form additional embodiments as will be apparent to those skilled in the art.
The above-listed detailed description is only a specific description of possible embodiments of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications such as combinations, divisions, or repetitions of features, which do not depart from the technical spirit of the present invention, should be included in the scope of the present invention.

Claims (10)

1. The electric energy generation method is characterized by comprising the following steps of:
arranging an alternating current/direct current converter for each asynchronous generator set and connecting the alternating current/direct current converter to a direct current bus;
starting an asynchronous generator set, actively increasing the rotating speed to a grid-connected rotating speed set point, or passively waiting for the rotating speed to exceed the grid-connected rotating speed set point and starting a power generation system;
presetting voltage set values of all alternating current/direct current converters;
starting each alternating current/direct current converter, and providing electric energy for direct current electric equipment through a direct current bus; and
and controlling each alternating current/direct current converter by using a droop control principle, stabilizing the direct current bus voltage and balancing the load of each asynchronous generator set.
2. The method of generating electrical energy of claim 1, further comprising the steps of: presetting voltage set values of each alternating current/direct current converter, specifically comprising the following steps:
setting a direct current bus reference voltage and a maximum deviation value;
acquiring real-time voltage of the direct-current bus, and calculating and judging whether the difference value between the reference voltage of the direct-current bus and the real-time voltage of the direct-current bus is greater than the maximum deviation value;
if so, setting the voltage set value of the AC/DC converter as the reference voltage of the DC bus; and
if not, the voltage set value of the alternating current/direct current converter is set as the real-time voltage of the direct current bus.
3. The method of generating electrical energy of claim 1, further comprising the steps of: the method comprises the following steps of controlling each alternating current/direct current converter by using a droop control principle, stabilizing direct current bus voltage and balancing loads of each asynchronous generator set, and specifically comprises the following steps:
presetting a load percentage-droop voltage compensation value curve of each asynchronous generator set;
switching the voltage set value of each alternating current/direct current converter into the sum of the direct current bus reference voltage and the droop voltage compensation value of each asynchronous generator set;
calculating droop voltage compensation values and voltage set values of the alternating current/direct current converters according to the real-time load percentage and the load percentage-droop voltage compensation value curve of each asynchronous generator set; and
and the alternating current/direct current converter automatically adjusts the rotating speed of the asynchronous generator set according to the load requirement of the asynchronous generator set and the optimal efficiency curve.
4. The power generation method of claim 3, wherein the load percentage-droop voltage compensation value curve is set such that the droop voltage compensation value reaches its maximum value at a load percentage of 0% and is 0 at a load percentage of 100%.
5. The method of generating electrical energy of claim 1, further comprising the steps of: a direct current/alternating current converter is arranged on the direct current bus, and alternating current electric energy is provided for alternating current electric equipment through the direct current/alternating current converter.
6. An electrical energy conversion system, comprising:
a plurality of asynchronous generator sets (10), wherein the asynchronous generator sets (10) can be driven by shafting work doing equipment;
a plurality of AC/DC converters (20), wherein the AC/DC converters (20) control the asynchronous generator sets (10) in a one-to-one correspondence manner, and can convert AC electric energy generated by the asynchronous generator sets (10) into DC electric energy with adjustable voltage;
a DC bus (30) which can be connected to a plurality of said AC/DC converters (20) and is used to provide an electrical load for a DC consumer; and
a plurality of controllers (40), wherein the controllers (40) control the AC/DC converters (20) in a one-to-one correspondence manner, and are configured to be capable of presetting voltage set values of the AC/DC converters (20) when the asynchronous generator set (10) is started, and controlling each AC/DC converter (20) by utilizing a droop control principle, stabilizing the voltage of the DC bus (30) and balancing the load of each asynchronous generator set (10).
7. The power conversion system of claim 6, wherein each controller (40) is configured to obtain the real-time dc bus voltage from the corresponding ac/dc converter (20), and calculate and determine whether the difference between the dc bus reference voltage and the real-time dc bus voltage is greater than the maximum deviation value according to a preset dc bus reference voltage and the maximum deviation value, if so, the corresponding ac/dc converter (20) is controlled to use the dc bus reference voltage as the voltage setting value, otherwise, the corresponding ac/dc converter (20) is controlled to use the real-time dc bus voltage as the voltage setting value.
8. The power conversion system of claim 6, wherein each controller (40) is configured to preset a load percentage-droop voltage compensation value curve of the corresponding asynchronous generator set (10), and the controller (40) is configured to obtain a real-time load percentage of the asynchronous generator set (10) from the corresponding ac/dc converter (20), calculate a droop voltage compensation value by combining the load percentage-droop voltage compensation value curve, and control the corresponding ac/dc converter (20) to set a sum of the dc bus reference voltage and the droop voltage compensation value as a voltage set value.
9. The power conversion system of claim 8, wherein each of said controllers (40) is configured to preset a load percentage-droop voltage compensation value curve in which the droop voltage compensation value reaches its maximum value at a load percentage of 0% and is 0 at a load percentage of 100%.
10. The power conversion system according to claim 6, further comprising at least one dc/ac converter (50) connected to the dc bus (30) and capable of converting the dc power on the dc bus (30) to parameter controllable ac power.
CN202210598577.1A 2022-05-30 2022-05-30 Electric energy generation method and electric energy conversion system Pending CN114928038A (en)

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CN202210598577.1A CN114928038A (en) 2022-05-30 2022-05-30 Electric energy generation method and electric energy conversion system

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Application Number Priority Date Filing Date Title
CN202210598577.1A CN114928038A (en) 2022-05-30 2022-05-30 Electric energy generation method and electric energy conversion system

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CN114928038A true CN114928038A (en) 2022-08-19

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