CN111786375A - Direct current power grid reconstruction method and device - Google Patents
Direct current power grid reconstruction method and device Download PDFInfo
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- CN111786375A CN111786375A CN202010595056.1A CN202010595056A CN111786375A CN 111786375 A CN111786375 A CN 111786375A CN 202010595056 A CN202010595056 A CN 202010595056A CN 111786375 A CN111786375 A CN 111786375A
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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
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- 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]
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Abstract
The invention discloses a method and a device for reconstructing a direct current power grid, wherein the method comprises the following steps: respectively obtaining voltage values on the first direct current bus and the second direct current bus; respectively calculating target output voltages of the power electronic transformers on the first direct current bus and the second direct current bus according to the voltage values, so that the terminal voltage of the first direct current bus and the terminal voltage of the second direct current bus are adjusted to be equal; adjusting the output voltages to target output voltages respectively; and closing the tail end of the first direct current bus and the tail end of the second direct current bus. By adopting the technical scheme, the flexible loop closing equipment can be replaced, the equipment cost is lower, nearly one hundred percent power transfer between different direct current power distribution networks can be realized, the impact of the closing operation of the direct current switch is very small, the overload situation of the power electronic transformer is avoided, and the normal and stable operation of the equipment can be ensured.
Description
Technical Field
The invention relates to the field of direct-current power grids, in particular to a direct-current power grid reconstruction method and device.
Background
In recent years, the permeability of distributed power sources in power distribution networks is gradually increased, and a serious challenge is brought to the power distribution networks. At present, the construction and application of a direct current power grid are in a primary stage, the scale of the direct current power distribution grid is small, and the direct current power distribution grid is connected to an alternating current power distribution grid through power electronic equipment such as a power frequency isolation type converter or a high-frequency isolation type power electronic transformer.
In the prior art, flexible loop closing equipment adopted for reconstruction connection among different direct current power distribution networks is high in cost and low in power conversion rate, the output power imbalance degree of a power electronic transformer on each bus after the direct current power distribution networks are reconstructed is large, and the situation of overload of the power electronic transformer can happen in serious situations, so that the normal and stable operation of equipment is influenced.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a method and a device for reconstructing a direct current power grid, and aims to solve the problems that the conversion rate of reconstructed power conversion between different direct current power grids is low, the output power unbalance degree of power electronic transformers on each direct current power grid after reconstruction is large, the normal and stable operation of equipment is influenced, and the like.
The technical scheme is as follows: the invention provides a direct current power grid reconstruction method, which comprises the following steps: respectively obtaining voltage values on the first direct current bus and the second direct current bus; the voltage value comprises the output voltage of a power electronic transformer on the direct current bus and the terminal voltage of the direct current bus; respectively calculating target output voltages of the power electronic transformers on the first direct current bus and the second direct current bus according to the voltage values, so that the terminal voltage of the first direct current bus and the terminal voltage of the second direct current bus are adjusted to be equal; respectively adjusting the output voltages of the power electronic transformers on the first direct current bus and the second direct current bus to target output voltages; and closing the tail end of the first direct current bus and the tail end of the second direct current bus.
Specifically, the terminal voltage of the first dc bus and the terminal voltage of the second dc bus are adjusted to be equal, and the deviation between the target output voltage of the power electronic transformer and the rated voltage of the dc bus on which the power electronic transformer is located is the smallest.
Specifically, the following formula is adopted for calculation:
wherein, when f is minimum, the target output voltage U of the power electronic transformer on the first DC busbus1_TAnd a target output voltage U of the power electronic transformer on the second DC busbus2_TThe following were used:
wherein, UNIs rated voltage of DC bus, ULK1Is the end voltage of the first DC bus, ULK2Is the end voltage of the second DC bus, Ubus1Is the output voltage, U, of a power electronic transformer on a first DC busbus2Is the output voltage of a power electronic transformer on a second DC bus, △ U1＝Ubus1_T－Ubus1，△U2＝Ubus2_T－Ubus2。
Specifically, the adjusted terminal voltage of the first direct current bus and the adjusted terminal voltage of the second direct current bus are obtained respectively, and if the terminal voltages are not equal to each other, the target output voltages of the power electronic transformers on the first direct current bus and the second direct current bus are recalculated and adjusted.
Specifically, the power electronic transformer with the large capacity on the direct current bus is operated according to a voltage control mode, and the rest of the power electronic transformers are operated according to a power control mode.
The invention also provides a direct current power grid reconstruction device, which comprises: voltage value acquisition unit, target voltage calculation unit, control adjustment unit and closed unit, wherein:
the voltage value acquisition unit is used for respectively acquiring voltage values on the first direct current bus and the second direct current bus; the voltage value comprises the output voltage of a power electronic transformer on the direct current bus and the terminal voltage of the direct current bus;
the target voltage calculation unit is used for calculating target output voltages of the power electronic transformers on the first direct current bus and the second direct current bus respectively according to the voltage values, so that the tail end voltage of the first direct current bus and the tail end voltage of the second direct current bus are adjusted to be equal;
the control adjusting unit is used for adjusting the output voltages of the power electronic transformers on the first direct current bus and the second direct current bus to target output voltages respectively;
the closing unit is used for closing the tail end of the first direct current bus and the tail end of the second direct current bus.
Specifically, the target voltage calculation unit is configured to adjust a terminal voltage of the first dc bus and a terminal voltage of the second dc bus to be equal, and a deviation between a target output voltage of the power electronic transformer and a rated voltage of the dc bus where the power electronic transformer is located is the smallest.
Specifically, the target voltage calculating unit is configured to calculate target output voltages of the power electronic transformers on the first dc bus and the second dc bus respectively, and calculate the target output voltages by using the following formulas:
wherein, when f is minimum, the target output voltage U of the power electronic transformer on the first DC busbus1_TAnd a target output voltage U of the power electronic transformer on the second DC busbus2_TThe following were used:
wherein, UNIs rated voltage of DC bus, ULK1Is the end voltage of the first DC bus, ULK2Is the end voltage of the second DC bus, Ubus1Is the output voltage, U, of a power electronic transformer on a first DC busbus2Is the output voltage of a power electronic transformer on a second DC bus, △ U1＝Ubus1_T－Ubus1，△U2＝Ubus2_T－Ubus2。
Specifically, the control adjustment unit is further configured to obtain the adjusted terminal voltage of the first dc bus and the adjusted terminal voltage of the second dc bus, and if the terminal voltages of the first dc bus and the second dc bus are not equal to each other, recalculate and adjust the target output voltages of the power electronic transformers on the first dc bus and the second dc bus.
Specifically, the closing unit is further configured to operate the power electronic transformer with the larger capacity on the dc bus according to a voltage control mode, and operate the remaining power electronic transformers according to a power control mode.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the device replaces flexible loop closing equipment, is low in equipment cost, can realize nearly one hundred percent power transfer among different direct current power distribution networks, has small impact on closing operation of a direct current switch, avoids overload of a power electronic transformer, and can ensure normal and stable operation of the equipment.
Drawings
Fig. 1 is a schematic flow chart of a dc power grid reconfiguration method according to the present invention;
fig. 2 is a structural diagram of a dc power grid according to the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Referring to fig. 1 and fig. 2, a flow diagram of a dc power grid reconfiguration method provided by the present invention and a structure diagram of a dc power grid provided by the present invention are respectively shown.
Step S101, respectively obtaining voltage values on a first direct current bus and a second direct current bus; the voltage values include the output voltage of the power electronic transformer on the dc bus, and the terminal voltage of the dc bus.
In an embodiment, the voltage value comprises, in particular, the output voltage U of the power electronic transformer on the first dc busbus1The output voltage U of the power electronic transformer on the second DC busbus2Terminal voltage U of the first DC busLK1Terminal voltage U of the second DC busLK2。
Step S102, respectively calculating target output voltages of the power electronic transformers on the first direct current bus and the second direct current bus according to the voltage values, so that the terminal voltage of the first direct current bus and the terminal voltage of the second direct current bus are adjusted to be equal.
In the specific implementation, PET1 (Power Electronic Transformer on first dc bus) and PET2 (Power Electronic Transformer on second dc bus) (PET) are respectively connected with first dc bus and second dc bus, and a communication switch LK is arranged between the ends of the dc buses, so that the Power Electronic Transformer can accurately control the dc buses in real timeVoltage (end voltage), initial output power of PET1 and PET2 is Pout1、Pout2，RT1、RT2The resistance values of the DC buses are respectively, and after the loop closing operation (the communication switch LK is closed), the output currents i of the PET1 and the PET2 are respectivelyp1(t)、ip2(t) is:
output current I of PET1 and PET2 in steady statep1、Ip2Comprises the following steps:
therefore, in the closed loop state, the output currents of the PET1 and the PET2 are influenced by the voltages on two sides of the closed loop point; when the voltage difference between the two sides ULK1-ULK2When the output power of the power transformer is larger, the output power imbalance of the PET1 and the PET2 is larger, and the overload of the power electronic transformer can happen in serious conditions, so that the normal and stable operation of the equipment is influenced.
In specific implementation, the terminal voltage of the first direct current bus and the terminal voltage of the second direct current bus are adjusted to be equal, power transfer between different direct current power distribution networks which is nearly one hundred percent can be achieved, impact of closing operation of the direct current switch is small, the situation of overload of a power electronic transformer is avoided, and normal and stable operation of equipment can be guaranteed.
In the embodiment of the invention, the terminal voltage of the first direct current bus and the terminal voltage of the second direct current bus are adjusted to be equal, and the deviation between the target output voltage of the power electronic transformer and the rated voltage of the direct current bus where the power electronic transformer is located is minimum.
In a specific implementation, the voltage U is at the end of the first DC busLK1And the end voltage U of the second DC busLK2On the premise of adjusting to be equal, the target output voltage of the power electronic transformer is increased, and the deviation between the target output voltage and the rated voltage of the direct current bus where the power electronic transformer is located is minimum, namely the first direct current busThe difference between the target output voltage of the power electronic transformer and the rated voltage of the first direct current bus is minimum, and the second direct current bus and the corresponding power electronic transformer are the same. Therefore, the operation stability of the direct current power grid and the power grid related equipment can be further improved.
In the embodiment of the invention, the target output voltages of the power electronic transformers on the first direct current bus and the second direct current bus are calculated by adopting the following formula:
wherein, when f is minimum, the target output voltage U of the power electronic transformer on the first DC busbus1_TAnd a target output voltage U of the power electronic transformer on the second DC busbus2_TThe following were used:
wherein, UNIs rated voltage of DC bus, ULK1Is the end voltage of the first DC bus, ULK2Is the end voltage of the second DC bus, Ubus1Is the output voltage, U, of a power electronic transformer on a first DC busbus2Is the output voltage of a power electronic transformer on a second DC bus, △ U1＝Ubus1_T－Ubus1，△U2＝Ubus2_T－Ubus2。
In a specific implementation, the rated voltage of the first direct current bus and the rated voltage of the second direct current bus can be both UNAccording to different practical application scenarios, the rated voltage of the first direct current bus and the rated voltage of the second direct current bus may be different.
In specific implementation, the adjusted target output voltage U is adjustedbus1_TAnd Ubus2_TThe method comprises the following steps:
wherein, Delta U1-ΔU2＝ULK2-ULK1Δ U, the function f is further constructed.
Step S103, output voltages of the power electronic transformers on the first direct current bus and the second direct current bus are respectively adjusted to target output voltages.
In the embodiment of the invention, after the output voltage of the power electronic transformer is adjusted to the target output voltage, the adjusted terminal voltage of the first direct current bus and the adjusted terminal voltage of the second direct current bus are respectively obtained, and if the terminal voltages are not equal, the target output voltages of the power electronic transformer on the first direct current bus and the power electronic transformer on the second direct current bus are recalculated and adjusted.
In a specific implementation, since the dc power grid may be maintained in an operating state for providing power to the consumer load during the voltage adjustment process, since the load may vary, it may result in that the terminal voltage of the first dc bus and the terminal voltage of the second dc bus are not equal even after the output voltage of the power electronic transformer is adjusted to the target output voltage. Therefore, the calculation and the adjustment are carried out again according to the steps, the conversion rate of power supply and the operation stability of the equipment can be further ensured, and the impact of the switch closing operation and the like can be avoided.
And step S104, closing the tail end of the first direct current bus and the tail end of the second direct current bus.
In the embodiment of the invention, after the power electronic transformer is closed, the power electronic transformer with larger capacity on the direct current bus can be operated according to the voltage control mode, and the rest power electronic transformers are operated according to the power control mode.
In a specific implementation, the closing may be the tie switch LK closing. The power electronic transformer can be controlled more easily by operating according to a voltage control mode and a power control mode respectively, and stable operation of the direct-current power grid after reconstruction is further guaranteed. The capacity of a transformer is the product of its rated voltage and rated current.
The embodiment of the present invention further provides a dc power grid reconfiguration apparatus, which includes: voltage value acquisition unit, target voltage calculation unit, control adjustment unit and closed unit, wherein:
the voltage value acquisition unit is used for respectively acquiring voltage values on the first direct current bus and the second direct current bus; the voltage value comprises the output voltage of a power electronic transformer on the direct current bus and the terminal voltage of the direct current bus;
the target voltage calculation unit is used for calculating target output voltages of the power electronic transformers on the first direct current bus and the second direct current bus respectively according to the voltage values, so that the tail end voltage of the first direct current bus and the tail end voltage of the second direct current bus are adjusted to be equal;
the control adjusting unit is used for adjusting the output voltages of the power electronic transformers on the first direct current bus and the second direct current bus to target output voltages respectively;
the closing unit is used for closing the tail end of the first direct current bus and the tail end of the second direct current bus.
In the embodiment of the present invention, the target voltage calculating unit is configured to adjust the terminal voltage of the first dc bus and the terminal voltage of the second dc bus to be equal, and a deviation between the target output voltage of the power electronic transformer and a rated voltage of the dc bus where the power electronic transformer is located is the smallest.
In an embodiment of the present invention, the target voltage calculating unit is configured to calculate target output voltages of power electronic transformers on the first dc bus and the second dc bus respectively, and calculate the target output voltages by using the following formula:
wherein, when f is minimum, the target output voltage U of the power electronic transformer on the first DC busbus1_TAnd a target output voltage U of the power electronic transformer on the second DC busbus2_TThe following were used:
wherein, UNIs rated voltage of DC bus, ULK1Is the end voltage of the first DC bus, ULK2Is the end voltage of the second DC bus, Ubus1Is the output voltage, U, of a power electronic transformer on a first DC busbus2Is the output voltage of a power electronic transformer on a second DC bus, △ U1＝Ubus1_T－Ubus1，△U2＝Ubus2_T－Ubus2。
In the embodiment of the present invention, the control adjustment unit is further configured to obtain the adjusted terminal voltage of the first dc bus and the adjusted terminal voltage of the second dc bus, and if the terminal voltages of the first dc bus and the second dc bus are not equal to each other, recalculate and adjust the target output voltages of the power electronic transformers on the first dc bus and the second dc bus.
In the embodiment of the present invention, the closing unit is further configured to operate the power electronic transformer with a large capacity on the dc bus according to a voltage control mode, and operate the remaining power electronic transformers according to a power control mode.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A method for reconstructing a DC power grid, comprising:
respectively obtaining voltage values on the first direct current bus and the second direct current bus; the voltage value comprises the output voltage of a power electronic transformer on the direct current bus and the terminal voltage of the direct current bus;
respectively calculating target output voltages of the power electronic transformers on the first direct current bus and the second direct current bus according to the voltage values, so that the terminal voltage of the first direct current bus and the terminal voltage of the second direct current bus are adjusted to be equal;
respectively adjusting the output voltages of the power electronic transformers on the first direct current bus and the second direct current bus to target output voltages;
and closing the tail end of the first direct current bus and the tail end of the second direct current bus.
2. The direct current power grid reconstruction method according to claim 1, wherein the adjusting the terminal voltage of the first direct current bus and the terminal voltage of the second direct current bus to be equal comprises:
and the tail end voltage of the first direct current bus and the tail end voltage of the second direct current bus are adjusted to be equal, and the deviation between the target output voltage of the power electronic transformer and the rated voltage of the direct current bus where the power electronic transformer is located is minimum.
3. The method according to claim 2, wherein the target output voltages of the power electronic transformers on the first dc bus and the second dc bus are calculated by using the following formula:
wherein, when f is minimum, the target output voltage U of the power electronic transformer on the first DC busbus1_TAnd a target output voltage U of the power electronic transformer on the second DC busbus2_TThe following were used:
wherein, UNIs rated voltage of DC bus, ULK1Is the end voltage of the first DC bus, ULK2Is the end voltage of the second DC bus, Ubus1Is the output voltage, U, of a power electronic transformer on a first DC busbus2Is the output voltage of a power electronic transformer on a second DC bus, △ U1＝Ubus1_T－Ubus1，△U2＝Ubus2_T－Ubus2。
4. The method according to claim 1, wherein after the adjusting the output voltages of the power electronic transformers on the first dc bus and the second dc bus to the target output voltages respectively, the method further comprises:
and respectively acquiring the regulated terminal voltage of the first direct current bus and the regulated terminal voltage of the second direct current bus, and if the terminal voltages are not equal, recalculating and regulating the target output voltages of the power electronic transformers on the first direct current bus and the second direct current bus.
5. The method according to claim 1, further comprising, after closing the ends of the first and second dc buses:
and operating the power electronic transformer with larger capacity on the direct current bus according to a voltage control mode, and operating the rest power electronic transformers according to a power control mode.
6. A dc grid reconfiguration device, comprising: voltage value acquisition unit, target voltage calculation unit, control adjustment unit and closed unit, wherein:
the voltage value acquisition unit is used for respectively acquiring voltage values on the first direct current bus and the second direct current bus; the voltage value comprises the output voltage of a power electronic transformer on the direct current bus and the terminal voltage of the direct current bus;
the target voltage calculation unit is used for calculating target output voltages of the power electronic transformers on the first direct current bus and the second direct current bus respectively according to the voltage values, so that the tail end voltage of the first direct current bus and the tail end voltage of the second direct current bus are adjusted to be equal;
the control adjusting unit is used for adjusting the output voltages of the power electronic transformers on the first direct current bus and the second direct current bus to target output voltages respectively;
the closing unit is used for closing the tail end of the first direct current bus and the tail end of the second direct current bus.
7. The apparatus according to claim 6, wherein the target voltage calculating unit is configured to adjust the terminal voltage of the first dc bus and the terminal voltage of the second dc bus to be equal, and minimize a deviation between the target output voltage of the power electronic transformer and a rated voltage of the dc bus on which the power electronic transformer is located.
8. The dc power grid reconfiguration device according to claim 7, wherein said target voltage calculating unit is configured to calculate target output voltages of power electronic transformers on said first dc bus and said second dc bus respectively, and to use the following formula to calculate:
wherein, when f is minimum, the target output voltage U of the power electronic transformer on the first DC busbus1_TAnd a target output voltage U of the power electronic transformer on the second DC busbus2_TThe following were used:
wherein, UNIs rated voltage of DC bus, ULK1Is the end voltage of the first DC bus, ULK2Is the end voltage of the second DC bus，Ubus1Is the output voltage, U, of a power electronic transformer on a first DC busbus2Is the output voltage of a power electronic transformer on a second DC bus, △ U1＝Ubus1_T－Ubus1，△U2＝Ubus2_T－Ubus2。
9. The direct current power grid reconstruction device according to claim 6, wherein the control adjustment unit is further configured to obtain the adjusted terminal voltage of the first direct current bus and the adjusted terminal voltage of the second direct current bus, respectively, and if the terminal voltages are not equal to each other, recalculate and adjust the target output voltages of the power electronic transformers on the first direct current bus and the second direct current bus.
10. The dc grid reconfiguration device according to claim 6, wherein said closing unit is further configured to operate the power electronic transformers with higher capacity on the dc bus in a voltage control mode, and the remaining power electronic transformers in a power control mode.
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| CN109066686A (en) * | 2018-08-08 | 2018-12-21 | 中国科学院电工研究所 | A kind of flexible switch station interconnection architecture with the comprehensive distribution of a variety of electric energy |
| CN110635511A (en) * | 2019-10-24 | 2019-12-31 | 湖南大学 | Photovoltaic energy storage hybrid system and control method thereof |
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| CN109066686A (en) * | 2018-08-08 | 2018-12-21 | 中国科学院电工研究所 | A kind of flexible switch station interconnection architecture with the comprehensive distribution of a variety of electric energy |
| CN110635511A (en) * | 2019-10-24 | 2019-12-31 | 湖南大学 | Photovoltaic energy storage hybrid system and control method thereof |
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