CN111525618B - Alternating current-direct current distributed energy and user group online interactive operation decision method - Google Patents

Alternating current-direct current distributed energy and user group online interactive operation decision method Download PDF

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CN111525618B
CN111525618B CN202010395402.1A CN202010395402A CN111525618B CN 111525618 B CN111525618 B CN 111525618B CN 202010395402 A CN202010395402 A CN 202010395402A CN 111525618 B CN111525618 B CN 111525618B
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CN111525618A (en
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邓卫
裴玮
孔力
伊尹
杨艳红
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Institute of Electrical Engineering of CAS
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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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/008—Circuit arrangements for ac mains or ac distribution networks involving trading of energy or energy transmission rights

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Abstract

The invention provides an alternating current-direct current distributed energy and user group online interactive operation decision method, which comprises the following steps: determining the AC/DC converter stations which currently participate in interactive operation by using actual values of direct-current voltages of the AC/DC converter stations, wherein a group corresponding to the AC/DC converter stations is used as an interactive main body; secondly, performing interactive operation decision by utilizing the interactive main bodies and combining power-price curves of the interactive main bodies to generate power instructions corresponding to the AC/DC convertor stations; and thirdly, calculating a droop coefficient of the corresponding AC/DC converter station by using the power instruction, and realizing corresponding control adjustment.

Description

Alternating current-direct current distributed energy and user group online interactive operation decision method
Technical Field
The invention belongs to the field of electric power, and particularly relates to an alternating current-direct current distributed energy and user group online interactive operation decision method.
Background
The alternating current and direct current system constructed based on the multi-terminal direct current can realize flexible networking, integrates distributed renewable energy sources and loads at a plurality of alternating current and direct current voltage levels, realizes flexible and safe access, improves the energy utilization efficiency, enhances the system control capability, realizes interconnection complementation in a larger range, and fully consumes the renewable energy sources, and becomes one of important forms of future power grids. The AC/DC Distributed energy resource and user community structure is shown in fig. 1, wherein the AC/DC Distributed energy resource and user community may generally comprise Distributed Energy Resources (DER) such as wind power, photovoltaic, local load, and AC/DC converter stations. The alternating current side of the AC/DC converter station in the AC/DC distributed energy and user group is connected to a bus or a node at a certain position of the AC system, and the direct current side of the AC/DC converter station is connected to a direct current network. A plurality of alternating current-direct current distributed energy sources and user groups are connected into a direct current network through corresponding AC/DC converter stations, and a multi-terminal structure is formed through the direct current network. A local dc load or the like can be connected to the inside of the dc network.
Adaptive operation methods based on the local droop control of the AC/DC converter station are proposed in the prior art, and the droop control characteristics are shown in fig. 2.
Wherein, UiAnd Ui,refActual values and rated values of direct-current voltages of the ith AC/DC converter station are respectively; piAnd Pi,refActual value and rated value of the power of the ith AC/DC converter station respectively; riAnd if the droop coefficient of the ith AC/DC converter station is the droop coefficient, the following requirements are met:
(Pi,ref-Pi)*Ri＝(Ui,ref-Ui) (1)
the droop coefficient selection principle is as follows:
Ri＝(Ui,ref-Ui,min)/(Pi,ref-Pi,max) (2)
wherein: u shapei,minRepresents the minimum value of the allowed direct current voltage of the ith AC/DC converter station, Pi,maxAnd the maximum value of the active power of the ith AC/DC converter station is shown. Droop control is a control strategy for automatically realizing energy regulation, and the basic principle of the droop control is that the droop control is controlled by utilizing the linear relation between the output active power of an AC/DC converter station and the voltage of a direct current side. The existing method improves the integration capability of direct current loads by balancing the load rates of different alternating current areas, but does not consider the direct current voltage change condition of each AC/DC converter station and interaction optimization among the AC/DC converter stations, and lacks effective support for alternating current and direct current distributed energy and user group operation management.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an alternating current-direct current distributed energy and user group online interactive operation decision method. Due to the random change of distributed renewable energy sources in a direct current network and the switching of loads, the operation decision of alternating current and direct current distributed energy sources and user groups is complex and changeable.
The invention provides an alternating current-direct current distributed energy and user group online interactive operation decision method, which comprises the following steps:
determining the AC/DC converter stations which currently participate in interactive operation by using actual values of direct-current voltages of the AC/DC converter stations, wherein a group corresponding to the AC/DC converter stations is used as an interactive main body;
secondly, performing interactive operation decision by utilizing the interactive main bodies and combining power-price curves of the interactive main bodies to generate power instructions corresponding to the AC/DC convertor stations;
and thirdly, calculating a droop coefficient of the corresponding AC/DC converter station by using the power instruction, and realizing corresponding control adjustment.
Further, the first step specifically includes:
setting I as the total number of AC/DC converter stations, subscript I indicates the ith AC/DC converter station, UiThe actual value of the direct current voltage of the ith AC/DC converter station is alpha, a judgment threshold value is alpha, and t is time;
computing
Figure BDA0002487348420000021
When in use
Figure BDA0002487348420000022
Then look for
Figure BDA0002487348420000023
Recording a corresponding subscript as h according to the minimum value of the data, and taking the h-th group as an interaction subject; otherwise, all groups are used as interaction subjects.
Further, the second step specifically includes:
set Ui,baseRepresents the steady state voltage value, P, of the ith AC/DC converter stationi,comIndicating the active instruction of the ith AC/DC converter station, setting PiThe actual value of the power of the ith AC/DC converter station; p is a radical ofi，jSetting the abscissa of a power-price curve of the ith group as power for the electric energy selling price corresponding to the power value j in the ith group, and expressing the power value j by j, wherein the minimum value of the power allowed by the ith group is set as PXiThe maximum allowable power of the ith group is PDiJ belongs to [ PXi，PDi](ii) a The ordinate of the power-price curve of the ith group is the price, and the price curve is made according to the running characteristic and the running target of each group;
setting the load power value in the DC network to be P during stable operationloadThen, the following conditions are satisfied:
Figure BDA0002487348420000031
and setting an active instruction according to the condition of the interactive main body, and carrying out power scheduling.
Further, if the h-th group is used as an interaction subject, the following steps are executed:
j belongs to [ PXh，PDh]，ph，jThe electric energy selling price corresponding to the power value j in the h group is the h AC/DC convertor station steady state voltage value Uh,baseH active instruction P of AC/DC converter stationh,comSatisfies the following conditions:
Figure BDA0002487348420000032
Rifor the i-th AC/DC converter station droop coefficient, Pi,refRated value for power of ith AC/DC converter station, Ui,refAnd the rated value is the direct-current voltage of the ith AC/DC converter station.
Further, if all groups are used as interaction subjects, the following steps are executed:
set KiIndicating the ith group criterion, TiAn interaction threshold value representing the ith group, wherein j is set to Pi，Ki＝Pi/pi，j；
From the whole KiFinding the maximum value, i.e. finding K1，…Ki，…KI-the maximum value in (j), with the index recorded as m, the following steps are performed:
step 2.1) setting i to 1, and setting temporary variables delta P, X, Xnew, Y and Ynew;
step 2.2) Δ P is P1…PIThe greatest common divisor of each numerical value;
if i is equal to m: then sequentially executing:
X＝Pm,
Y＝X*pm，X；
Xnew＝Pm+ΔP；
Ynew＝Xnew*pm，Xnew；
Ti＝|Ynew-Y|
if i is not equal to m: then sequentially executing:
X＝Pi,
Y＝X*pi，X；
Xnew＝Pi-ΔP；
Ynew＝Xnew*pi，Xnew；
Ti＝|Ynew-Y|
step 2.3) if I ═ I, look for { T ═ I1，…Ti，…TIThe minimum value in (f), whose index records m updates accordingly, and set Pm＝min{(Pm+ΔP),PDmAnd the rest groups are set in sequence:
Figure BDA0002487348420000041
after all the settings are finished, continuing to judge max { T }1，…Ti，…TIWhether the xi is smaller than xi which is a convergence threshold value, if the xi is smaller than xi, the interaction process is quitted, otherwise, the step 2.1 is returned;
if I < I, I is I +1, and the step 2.2 is returned;
after the interaction is finished, setting an active instruction P of the ith AC/DC converter stationi,com＝PiAnd then all the active instructions of the AC/DC converter station are { P }1,com，…Pi,com，…PI,com}。
Further, the third step includes:
sending the power instruction of each AC/DC converter station to the corresponding AC/DC converter station, updating the droop coefficient after each AC/DC converter station receives the power instruction, and setting RiThe droop coefficient of the ith AC/DC converter station is R, and the droop coefficient of the 1 st AC/DC converter station is R1The droop coefficient of the I station AC/DC converter station is RI(ii) a Set Ui,minRepresents the minimum value of the allowed direct current voltage of the ith AC/DC converter station, Pi,maxThe maximum value of the active power of the ith AC/DC converter station is shown, and U is seti,baseRepresents the steady state voltage value, P, of the ith AC/DC converter stationi,comAnd indicating an ith AC/DC converter station active instruction. Then:
Ri＝(Ui,base-Ui,min)/(Pi,com-Pi,max)
each AC/DC converter station performs a new droop factor.
Advantageous effects
The invention provides an alternating current-direct current distributed energy and user group online interactive operation decision method, which overcomes the existing defects, the alternating current-direct current distributed energy and the user group form a multi-terminal mutual-aid interconnection structure, thus depending on controllable distributed energy, flexible multi-terminal interconnection topology and accurate multi-terminal coordination control, the tide among a plurality of groups can be mutually and economically balanced through a direct current network, and particularly through online interactive operation, the whole body has wider power sharing capability and power supply capability, and the application prospect is wide.
Drawings
FIG. 1: the typical structure of an alternating current-direct current hybrid system;
FIG. 2: droop control principle;
FIG. 3: the invention relates to a flow chart of an on-line interactive operation decision method of alternating current and direct current distributed energy and a user group;
FIG. 4: power-price curve at a certain moment in a certain group.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention without creative efforts.
The invention provides an alternating current-direct current distributed energy and user group online interactive operation decision method, and a specific flow is shown in fig. 3. Comprises three steps which are respectively as follows: interactive body selection, interactive operation decision and control parameter adjustment.
Determining the AC/DC converter stations which currently participate in interactive operation by using actual values of direct-current voltages of the AC/DC converter stations, wherein a group corresponding to the AC/DC converter stations is used as an interactive main body;
secondly, performing interactive operation decision by utilizing the interactive main bodies and combining power-price curves of the interactive main bodies to generate power instructions corresponding to the AC/DC convertor stations;
and thirdly, calculating a droop coefficient of the corresponding AC/DC converter station by using the power instruction, and realizing corresponding control adjustment.
The specific process of the step one is as follows:
setting I as the total number of AC/DC converter stations, subscript I indicates the ith AC/DC converter station, UiThe actual value of the direct current voltage of the ith AC/DC converter station is alpha, a judgment threshold value is alpha, and t is time;
computing
Figure BDA0002487348420000051
When in use
Figure BDA0002487348420000052
Then look for
Figure BDA0002487348420000053
And recording a corresponding subscript of h as the minimum value of the (h), and taking the h-th group as an interaction subject.
Otherwise, all groups are used as interaction subjects.
The specific flow of the second step is as follows:
set Ui,baseRepresenting the ith AC/DC converter stationSteady state voltage value, Pi,comAnd indicating an ith AC/DC converter station active instruction. Setting PiThe actual value of the power of the ith AC/DC converter station; p is a radical ofi，jAnd selling the electric energy corresponding to the power value j in the ith group. Setting the abscissa of the power-price curve of the ith group as power, and using j to represent a power value j, wherein the minimum allowed power value of the ith group is set as PXiThe maximum allowable power of the ith group is PDiJ belongs to [ PXi，PDi](ii) a The ordinate of the power-price curve (which represents the change of the electricity selling price when the output power of the convertor station changes) of the ith group is the price, pi，jAnd selling the electric energy corresponding to the power value j in the ith group. The price curve is made according to the self operating characteristics and the operating targets of each group and can be a linear curve, a nonlinear curve and the like.
Setting the load power value in the DC network to be P during stable operationloadThen, the following conditions are satisfied:
Figure BDA0002487348420000061
if the h group is used as an interaction subject, then:
j belongs to [ PXh，PDh]，ph，jAnd selling the electric energy corresponding to the power value j in the h group. The h station AC/DC converter station steady state voltage value Uh,baseH active instruction P of AC/DC converter stationh,comSatisfies the following conditions:
Figure BDA0002487348420000062
if all groups are the subject of the interaction.
Set KiShowing the ith group criterion, setting TiIndicating the interaction threshold for the ith population. For the ith population, set j to Pi，Ki＝Pi/pi，j；
From the whole KiIn finding the maximum, i.e. finding{K1，…Ki，…KI-the maximum value in (j), with the index recorded as m, then:
step 2.1) setting i to 1, and setting temporary variables delta P, X, Xnew, Y and Ynew;
step 2.2) Δ P is P1…PIThe greatest common divisor of each numerical value;
if i is equal to m: then X ═ P is performed in sequencem,Y＝X*pm，X；Xnew＝Pm+ΔP；Ynew＝Xnew*pm，Xnew；Ti＝|Ynew-Y|
If i is not equal to m: then X ═ P is performed in sequencei,Y＝X*pi，X；Xnew＝Pi-ΔP；Ynew＝Xnew*pi，Xnew；Ti＝|Ynew-Y|
Step 2.3) if I ═ I, look for { T ═ I1，…Ti，…TIThe minimum value in (f), whose index records m updates accordingly, and set Pm＝min{(Pm+ΔP),PDmAnd the rest groups are set in sequence:
Figure BDA0002487348420000063
after all the settings are finished, continuing to judge max { T }1，…Ti，…TIWhether xi is smaller than xi (xi is a convergence threshold value), if yes, the interaction process is quitted, otherwise, the step 2.1 is returned;
if I < I, I ═ I +1, return to step 2.2.
After the interaction is finished, setting an active instruction P of the ith AC/DC converter stationi,com＝PiAnd then all the active instructions of the AC/DC converter station are { P }1,com，…Pi,com，…PI,com}；
The specific flow of the third step is as follows:
and sending the power instruction of each AC/DC converter station to the corresponding AC/DC converter station. And when each AC/DC converter station receives the power command, updating the droop coefficient. Set RiFor the droop coefficient of the ith AC/DC converter station, the droop system of the 1 st AC/DC converter stationNumber R1The droop coefficient of the I station AC/DC converter station is RI. Set Ui,minRepresents the minimum value of the allowed direct current voltage of the ith AC/DC converter station, Pi,maxAnd the maximum value of the active power of the ith AC/DC converter station is shown. Set Ui,baseRepresents the steady state voltage value, P, of the ith AC/DC converter stationi,comAnd indicating an ith AC/DC converter station active instruction. Then:
Ri＝(Ui,base-Ui,min)/(Pi,com-Pi,max)
each AC/DC converter station performs a new droop factor.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but various changes may be apparent to those skilled in the art, and it is intended that all inventive concepts utilizing the inventive concepts set forth herein be protected without departing from the spirit and scope of the present invention as defined and limited by the appended claims.

Claims (3)

1. An alternating current-direct current distributed energy and user group online interactive operation decision method is characterized by comprising the following steps:
determining the AC/DC converter stations which currently participate in interactive operation by using actual values of direct-current voltages of the AC/DC converter stations, wherein a group corresponding to the AC/DC converter stations is used as an interactive main body;
secondly, performing interactive operation decision by utilizing the interactive main bodies and combining power-price curves of the interactive main bodies to generate power instructions corresponding to the AC/DC convertor stations;
thirdly, calculating a droop coefficient of the corresponding AC/DC converter station by using the power instruction to realize corresponding control adjustment; the first step specifically comprises:
setting I as the total number of AC/DC converter stations, subscript I indicates the ith AC/DC converter station, UiThe actual value of the direct current voltage of the ith AC/DC converter station is alpha, a judgment threshold value is alpha, and t is time;
computing
Figure FDA0003218248040000014
When in use
Figure FDA0003218248040000011
Then look for
Figure FDA0003218248040000012
Recording a corresponding subscript as h according to the minimum value of the data, and taking the h-th group as an interaction subject; otherwise, all groups are used as interaction subjects;
the second step specifically comprises:
set Ui,baseRepresents the steady state voltage value, P, of the ith AC/DC converter stationi,comIndicating the active instruction of the ith AC/DC converter station, setting PiThe actual value of the power of the ith AC/DC converter station; p is a radical ofi，jSetting the abscissa of a power-price curve of the ith group as power for the electric energy selling price corresponding to the power value j in the ith group, and expressing the power value by j, wherein the minimum value of the allowed power of the ith group is set as PXiThe maximum allowable power of the ith group is PDiJ belongs to [ PXi，PDi](ii) a The ordinate of the power-price curve of the ith group is the price, and the price curve is made according to the running characteristic and the running target of each group;
setting the load power value in the DC network to be P during stable operationloadThen, the following conditions are satisfied:
Figure FDA0003218248040000013
setting an active instruction according to the condition of an interactive main body, and carrying out power scheduling;
the third step comprises the following steps:
sending the power instruction of each AC/DC converter station to the corresponding AC/DC converter station, updating the droop coefficient after each AC/DC converter station receives the power instruction, and setting RiIs the ith station AC-The droop coefficient of the DC converter station is R, and the droop coefficient of the 1 st AC/DC converter station is R1The droop coefficient of the I station AC/DC converter station is RI(ii) a Set Ui,minRepresents the minimum value of the allowed direct current voltage of the ith AC/DC converter station, Pi,maxThe maximum value of the active power of the ith AC/DC converter station is shown, and U is seti,baseRepresents the steady state voltage value, P, of the ith AC/DC converter stationi,comAnd representing the active instruction of the ith AC/DC converter station, then:
Ri＝(Ui,base-Ui,min)/(Pi,com-Pi,max)
each AC/DC converter station performs a new droop factor.
2. The method for decision-making on-line interactive operation of the alternating current and direct current distributed energy resource and the user group according to claim 1, wherein in the second step, if the h group is used as an interactive subject, the following steps are executed:
j belongs to [ PXh，PDh]，ph，jThe electric energy selling price corresponding to the power value j in the h group is the h AC/DC convertor station steady state voltage value Uh,baseH active instruction P of AC/DC converter stationh,comSatisfies the following conditions:
Figure FDA0003218248040000021
Figure FDA0003218248040000022
Rifor the i-th AC/DC converter station droop coefficient, Pi,refRated value for power of ith AC/DC converter station, Ui,refAnd the rated value is the direct-current voltage of the ith AC/DC converter station.
3. The method for decision-making of the online interactive operation of the alternating current-direct current distributed energy resource and the user groups according to claim 1, wherein in the second step, if all the groups are used as interactive subjects, the following steps are executed:
set KiIndicating the ith group criterion, TiAn interaction threshold value representing the ith group, wherein j is set to Pi，Ki＝Pi/pi，j；
From the whole KiFinding the maximum value, i.e. finding K1，…Ki，…KI-the maximum value in (j), with the index recorded as m, the following steps are performed:
step 2.1) setting i to 1, and setting temporary variables delta P, X, Xnew, Y and Ynew;
step 2.2) Δ P is P1…PIThe greatest common divisor of each numerical value;
if i is equal to m: then sequentially executing:
X＝Pm,
Y＝X*pm，X；
Xnew＝Pm+ΔP；
Ynew＝Xnew*pm，Xnew；
Ti＝|Ynew-Y|
if i is not equal to m: then sequentially executing:
X＝Pi,
Y＝X*pi，X；
Xnew＝Pi-ΔP；
Ynew＝Xnew*pi，Xnew；
Ti＝|Ynew-Y|
step 2.3) if I ═ I, look for { T ═ I1，…Ti，…TIThe minimum value in, with the subscript recording m updates accordingly,
and set Pm＝min{(Pm+ΔP),PDmAnd the rest groups are set in sequence:
Figure FDA0003218248040000031
after all the settings are finished, continuing to judge max { T }1，…Ti，…TIWhether the value is less than xi which is convergence thresholdIf the current time is less than xi, the interactive process is quitted, otherwise, the step 2.1 is returned;
if I < I, I is I +1, and the step 2.2 is returned;
after the interaction is finished, setting an active instruction P of the ith AC/DC converter stationi,com＝PiAnd then all the active instructions of the AC/DC converter station are { P }1,com，…Pi,com，…PI,com}。
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CN110829448A (en) * 2019-10-15 2020-02-21 国网江苏省电力有限公司电力科学研究院 Distributed voltage interactive support control method and system for alternating current-direct current hybrid power distribution network

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CN105023192A (en) * 2014-04-18 2015-11-04 国家电网公司 Power system source-grid-load interaction control strategy evaluation method
CN105162113A (en) * 2015-08-26 2015-12-16 天津大学 Sensitivity analysis based interaction cost calculation method for microgrid and power distribution grid
CN107611968A (en) * 2017-09-30 2018-01-19 四川大学 The active distribution network economical operation method of the interactive consumption of distributed energy
CN108764734A (en) * 2018-05-30 2018-11-06 南方电网科学研究院有限责任公司 A kind of integrated energy system interactive simulation method and device based on leader-followers games
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