CN206932010U - Hybrid direct-current station control coordination control device and power transmission system - Google Patents
Hybrid direct-current station control coordination control device and power transmission system Download PDFInfo
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Abstract
The embodiment of the utility model provides a coordinated control device and transmission system that mix direct current station accuse relates to alternating current-direct current transmission system transient stability control technical field, and the direct current transmission system who has solved among the prior art and has adopted frequency control method is carrying out the frequency stabilization, can't guarantee the problem of the frequency stabilization effect of every receiving according to the reasonable power modulation volume of every condition distribution that receives the end reality. The method comprises the steps of obtaining a difference value between a preset frequency of a conventional direct current sending end and a current frequency of the conventional direct current sending end; generating a power regulating quantity according to the difference value, filtering the power regulating quantity to obtain a first regulating quantity of a first flexible direct current receiving end, and generating a second regulating quantity of a second flexible direct current receiving end through subtraction operation; and correcting the active power of the first flexible direct current receiving end according to the first regulating quantity, and correcting the active power of the second flexible direct current receiving end according to the second regulating quantity. The embodiment of the utility model provides a coordinated control for mixing direct current station accuse.
Description
Technical field
It the utility model is related to AC/DC Power System Transient Stability Control technical field, more particularly to a kind of mixed DC
Stand control cooperative control device and transmission system.
Background technology
Multi-terminal direct current transmission system refers to, by the DC converter station of more than 3, connect by series, parallel or series-parallel connection mode
The transmission system got up, multi-terminal direct current transmission system can realize multiple feed and more drop points by electricity.As voltage-source type changes
Stream device is on the increase what high-voltage dc transmission electrical domain was applied, and multi-terminal HVDC transmission technology will generate electricity in distribution type renewable energy
The fields such as grid-connected, HVDC power distribution network, large-scale AC network flexible interconnection are widely used.
DC transmission system is when maintaining sending stable with receiving end AC system frequency using FREQUENCY CONTROL side
Method, i.e., when the frequency of sending end or receiving end AC system disturbs, DC transmission system is by adjusting dc power come real
The frequency stabilization of existing sending or receiving-end system；However, sent out using the DC transmission system of control method for frequency stable
During the sending frequency of raw disturbance, due to each receiving end actual motion parameter and differ, to different receiving ends using identical
Algorithm for power modulation amount be adjusted, cause part receiving end to obtain good frequency stabilization effect, and the frequency of part receiving end
Stablizing effect is poor.
From the foregoing, in the prior art using the DC transmission system of control method for frequency when carrying out frequency stabilization,
Rational algorithm for power modulation amount can not be distributed according to the actual situation of each receiving end, ensure the frequency stabilization effect of each receiving end.
Utility model content
Embodiment of the present utility model provides the cooperative control device controlled at a kind of mixed DC station and transmission system, solved
, can not be actual according to each receiving end in the prior art using the DC transmission system of control method for frequency when carrying out frequency stabilization
Situation distribute rational algorithm for power modulation amount, the problem of ensureing the frequency stabilization effect of each receiving end.
To reach above-mentioned purpose, embodiment of the present utility model adopts the following technical scheme that：
First aspect, embodiment of the present utility model provide a kind of control method for coordinating of mixed DC station control, including：When
When the frequency of customary DC sending end disturbs, the predeterminated frequency of customary DC sending end and the current frequency of customary DC sending end are obtained
The difference of rate；Power adjusting amount is generated according to difference, is filtered to obtain the of the first flexible direct current receiving end to power adjusting amount
One regulated quantity, and by the second regulated quantity of subtraction the second flexible direct current receiving end of generation, wherein the second regulated quantity is equal to work(
Rate regulated quantity subtracts the first regulated quantity；According to the active power of first regulated quantity amendment the first flexible direct current receiving end, according to second
The active power of regulated quantity amendment the second flexible direct current receiving end.
Optionally, this method also includes：Obtain total active power of Hybrid HVDC system；Total active power is distributed
Into the active power of the first flexible direct current receiving end and the active power of the second flexible direct current receiving end；Wherein, total active power is equal to
The active power of first flexible direct current receiving end and the second flexible direct current receiving end active power and.
Optionally, this method also includes：When the active power of revised first flexible direct current receiving end is more than or equal to the
During the maximum active power of one flexible direct current receiving end, it is flexible that the active power that the first flexible direct current receiving end exceeds is transferred to second
Direct current receiving end, generate the active power of the first flexible direct current receiving end of reallocation and the active power of the second flexible direct current receiving end；
Wherein, the expression formula for the active power that the first flexible direct current receiving end exceeds is：M1=P1+ △ 1-N1；M1 represents that first is flexible
The active power that direct current receiving end exceeds, P1 represent the active power of the first flexible direct current receiving end, and Δ 1 represents the first regulated quantity, N1
Represent the maximum active power of the first flexible direct current receiving end.
Optionally, this method also includes：When the active power of revised second flexible direct current receiving end is more than or equal to the
During the maximum active power of two flexible direct current receiving ends, it is flexible that the active power that the second flexible direct current receiving end exceeds is transferred to first
Direct current receiving end, generate the active power of the first flexible direct current receiving end of reallocation and the active power of the second flexible direct current receiving end；
Wherein, the expression formula for the active power that the second flexible direct current receiving end exceeds is：M2=P2+ △ 2-N2；M2 represents that second is flexible
The active power that direct current receiving end exceeds, P2 represent the active power of the second flexible direct current receiving end, and Δ 2 represents the second regulated quantity, N2
Represent the maximum active power of the second flexible direct current receiving end.
Second aspect, embodiment of the present utility model provide a kind of cooperative control device of mixed DC station control, including：Subtract
Musical instruments used in a Buddhist or Taoist mass, the first node being connected with subtracter, the first signal input part and secondary signal input, is connected with first node
Bilateral frequency difference controller, the section point being connected with bilateral frequency difference controller, the power divider being connected with section point, with work(
The first signal output part and secondary signal output end of rate distributor connection；Subtracter, for when the frequency of customary DC sending end
When disturbing, the difference of the predeterminated frequency of customary DC sending end and the current frequency of customary DC sending end is obtained；Bilateral frequency difference
Controller, the difference for being obtained according to subtracter generate power adjusting amount；Power divider, for bilateral frequency difference controller
The power adjusting amount of generation is filtered to obtain the first regulated quantity of the first flexible direct current receiving end, and passes through subtraction generation the
Second regulated quantity of two flexible direct current receiving ends, wherein the second regulated quantity subtracts the first regulated quantity equal to power adjusting amount, according to
The active power of one regulated quantity amendment the first flexible direct current receiving end, according to having for second regulated quantity amendment the second flexible direct current receiving end
Work(power.
Optionally, cooperative control device also includes：Receiving end power divider, the 3rd letter being connected with receiving end power divider
Number input, the 3rd signal output part and the 4th signal output part, the first adder being connected with the 3rd signal output part, with
The first signal output part and the 3rd node of first adder connection, the second adder being connected with the 4th signal output part, with
The secondary signal output end and fourth node of second adder connection；Receiving end power divider, it is defeated to be additionally operable to acquisition mixed DC
Total active power of electric system；Receiving end power divider, it is additionally operable to total active power being distributed into the first flexible direct current receiving end
The active power of active power and the second flexible direct current receiving end；Wherein, total active power is equal to having for the first flexible direct current receiving end
Work(power and the second flexible direct current receiving end active power and.
Optionally, cooperative control device also includes：Processor；The 3rd node that is connected with processor, fourth node, the 5th
Signal output part and the 6th signal output part；Processor, for when the revised first flexible direct current receiving end of first adder
When active power is more than or equal to the maximum active power of the first flexible direct current receiving end, have what the first flexible direct current receiving end exceeded
Work(power is transferred to the second flexible direct current receiving end, generates the active power and the second flexibility of the first flexible direct current receiving end of reallocation
The active power of direct current receiving end；Wherein, the expression formula for the active power that the first flexible direct current receiving end exceeds is：M1=P1+ △
1-N1；M1 represents the active power that the first flexible direct current receiving end exceeds, and P1 represents the active power of the first flexible direct current receiving end, Δ
1 represents the first regulated quantity, and N1 represents the maximum active power of the first flexible direct current receiving end.
Optionally, cooperative control device also includes：Processor；The 3rd node that is connected with processor, fourth node, the 5th
Signal output part and the 6th signal output part；Processor, for when the revised second flexible direct current receiving end of second adder
When active power is more than or equal to the maximum active power of the second flexible direct current receiving end, have what the second flexible direct current receiving end exceeded
Work(power is transferred to the first flexible direct current receiving end, generates the active power and the second flexibility of the first flexible direct current receiving end of reallocation
The active power of direct current receiving end；Wherein, the expression formula for the active power that the second flexible direct current receiving end exceeds is：M2=P2+ △
2-N2；M2 represents the active power that the second flexible direct current receiving end exceeds, and P2 represents the active power of the second flexible direct current receiving end, Δ
2 represent the second regulated quantity, and N2 represents the maximum active power of the second flexible direct current receiving end.
The third aspect, embodiment of the present utility model provide a kind of transmission system, including：Any provided such as second aspect
The cooperative control device of the mixed DC station control of item, the customary DC station being connected with the cooperative control device of mixed DC station control
Control, the control of the first flexible direct current station and the control of the second flexible direct current station, the rectification side pole control with the control connection of customary DC station, with rectification
The converter valve pole control of side pole control connection, the converter valve with the customary DC sending end of converter valve pole control connection, with the first flexible direct current
Stand and control the first inversion side pole control of connection, the first modularization multi-level converter pole control being connected with the first inversion side pole control, with
The modularization multi-level converter of first flexible direct current receiving end of the first modularization multi-level converter pole control connection, it is soft with second
Property direct current station control connection the second inversion side pole control, the second modularization multi-level converter pole being connected with the second inversion side pole control
Control, the modularization multi-level converter with the second flexible direct current receiving end of the second modularization multi-level converter pole control connection.
The cooperative control device and transmission system for the mixed DC station control that the utility model embodiment provides, work as customary DC
When the frequency of sending end disturbs, the power adjusting amount generated to the frequency-splitting of customary DC sending end is filtered so as to obtain
First regulated quantity of the first flexible direct current receiving end, and pass through the second regulated quantity of subtraction the second flexible direct current receiving end of generation；
Go amendment first flexible rather than the power adjusting amount directly generated in the prior art according to the frequency-splitting of customary DC sending end
Direct current receiving end and the second flexible direct current receiving end, can between the first flexible direct current receiving end and the second flexible direct current receiving end due to considering
It can have differences, therefore the first flexible direct current receiving end is modified using the first regulated quantity, the second flexible direct current receiving end is adopted
It is modified with the second regulated quantity, so as to ensure that the frequency stabilization effect of each receiving end；Solve in the prior art using frequency
The DC transmission system of rate control method can not distribute rational when carrying out frequency stabilization according to the actual situation of each receiving end
Algorithm for power modulation amount, the problem of ensureing the frequency stabilization effect of each receiving end.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of flow signal of the control method for coordinating for mixed DC station control that embodiment of the present utility model provides
Figure；
Fig. 2 is a kind of structural representation of the cooperative control device for mixed DC station control that embodiment of the present utility model provides
Figure；
Fig. 3 is a kind of structural representation for transmission system that embodiment of the present utility model provides；
Fig. 4-a- Fig. 4-d are a kind of structure of the specific implementation for transmission system that embodiment of the present utility model provides
Schematic diagram.
Reference：
Transmission system -10；
Cooperative control device -101；Subtracter -1010；Bilateral frequency difference controller -1011；Power divider -1012；Receiving end
Power divider -1013；First adder -1014；Second adder 1015；Processor -1016；
Customary DC station control -102；First flexible direct current station control -103；Second flexible direct current station control -104；Rectification side pole
Control -105；Converter valve pole control -106；The converter valve -107 of customary DC sending end；First inversion side pole control -108；First modularization
Multilevel converter pole control -109；The modularization multi-level converter -110 of first flexible direct current receiving end；Second inversion side pole control-
111；Second modularization multi-level converter pole control -112；The modularization multi-level converter -113 of second flexible direct current receiving end.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
The executive agent of the control method for coordinating for the mixed DC station control that the utility model embodiment provides can be mixing
The cooperative control device of direct current station control, the cooperative control device that the mixed DC station is controlled in the application of reality are also known as coordinating
Controller；The control method for coordinating for the mixed DC station control that the utility model embodiment provides is applied to Hybrid HVDC system
System, the specific Hybrid HVDC system can be three end Hybrid HVDC systems；Wherein, the three ends mixed DC uses
Parallel-connection structure, and be made up of a customary DC sending end and two flexible direct current receiving-end systems.Exemplary is adopted with customary DC
Controlled with voltage is determined, two flexible direct currents use constant dc power control, and the first flexible direct current receiving end feed-in weak AC system, second is soft
Illustrated exemplified by the property strong AC system of direct current receiving end feed-in, concrete implementation mode is as follows：
Embodiment one, embodiment of the present utility model provide a kind of control method for coordinating of mixed DC station control, such as Fig. 1 institutes
Show including：
S101, when the frequency of customary DC sending end disturbs, obtain customary DC sending end predeterminated frequency and routine
The difference of the current frequency of direct current sending end.
S102, according to difference generate power adjusting amount, power adjusting amount is filtered to obtain the first flexible direct current receiving end
The first regulated quantity, and by subtraction generate the second flexible direct current receiving end the second regulated quantity, wherein second regulated quantity etc.
The first regulated quantity is subtracted in power adjusting amount.
It should be noted that the first regulated quantity can be equal to the second regulated quantity or the first regulated quantity and the first regulated quantity not
Together.
S103, the active power according to first regulated quantity amendment the first flexible direct current receiving end, according to the second regulated quantity amendment
The active power of second flexible direct current receiving end.
Optionally, this method also includes：Obtain total active power of Hybrid HVDC system；Total active power is distributed
Into the active power of the first flexible direct current receiving end and the active power of the second flexible direct current receiving end；Wherein, total active power is equal to
The active power of first flexible direct current receiving end and the second flexible direct current receiving end active power and.
It should be noted that the power that total active power can be set by the operational plan or operations staff for dispatching setting
Obtain total active power；Total active power is generally distributed into the first active of the first flexible direct current receiving end in the application of reality
The step for second active power of power and the second flexible direct current receiving end, is referred to as receiving end power distribution link；The link provides more
Kind distribution method, such as proportional allocation, by measure distribution method are soft so as to obtain first by calculating to total active power
Property direct current receiving end the first active power and the second flexible direct current receiving end the second active power.
Generally by the predeterminated frequency according to customary DC sending end and the current frequency of customary DC sending end in the application of reality
This flow FREQUENCY CONTROL of the difference generation power adjusting amount of rate；Power adjusting amount will be filtered to obtain the first flexible direct current
First regulated quantity of receiving end, and by the second regulated quantity of subtraction the second flexible direct current receiving end of generation, wherein the second regulation
Amount, which is equal to power adjusting amount and subtracts the first regulated quantity this flow and be referred to as power distribution control, (is also referred to as the work(based on LPF
Rate distribution control, specific filtering can realize that subtraction can be realized by subtracter by low-pass first order filter)；
Exemplary, algorithm for power modulation amount caused by FREQUENCY CONTROL is filtered by receiving end power distribution link, so as to generate
First active power of one flexible direct current receiving end, and run by subtraction to obtain the second wattful power of the second flexible direct current receiving end
Rate；So as to realize the quick sound of the slow response of weak receiving end AC system power adjusting and strong receiving end AC system power adjusting
Should.
Specifically, FREQUENCY CONTROL comprises the steps of：
1st, the difference of the predeterminated frequency and the current frequency of customary DC sending end of customary DC sending end is filtered, eliminated
Burr signal (generally the difference of the predeterminated frequency and the current frequency of customary DC sending end of customary DC sending end is filtered,
This flow of elimination burr signal is referred to as filtering link).
2nd, the difference for the frequency for eliminating burr signal (will generally be eliminated into burr letter compared with frequency setting value
Number frequency difference compared with frequency setting value this flow be referred to as dead band link)；Eliminated it should be noted that working as
When the difference of the frequency of burr signal is less than frequency setting value, any operation is not taken；Specifically, dead band refers to work as frequency departure
When signal is less than dead band setting value, link output in dead band is 0；When frequency departure signal is more than dead band setting value, dead band link
It is to prevent frequency controller frequent movement to export as frequency departure, its major function.
3rd, when the difference of frequency is more than or equal to the frequency setting value in dead band, formed according to the difference of setting value and frequency
Control deviation, by ratio (the English full name of deviation：Proportion, referred to as：P) and integration (English full name：Integral, letter
Claim：I) form controlled quentity controlled variable by linear combination (generally will form control deviation, by deviation according to the difference of setting value and frequency
This flow is referred to as PI links by linear combination composition controlled quentity controlled variable for ratio (P) and integration (I))；Specifically, it can be controlled by PI
Device processed performs PI links.
4, amplitude limit is carried out to the controlled quentity controlled variable of output, exports total algorithm for power modulation amount (generally by the controlled quentity controlled variable progress to output
Amplitude limit, export total this flow of algorithm for power modulation amount and be referred to as output violent change link).
Specifically, power distribution control comprises the following steps：
The 1st, total algorithm for power modulation amount is carried out to the LPF of large time constant, obtain weak receiving end flexible direct current FREQUENCY CONTROL
Total algorithm for power modulation amount (is generally carried out the LPF of large time constant, obtains weak receiving end by caused first power adjusting amount
First power adjusting amount this flow is referred to as LPF link caused by flexible direct current FREQUENCY CONTROL).
2nd, the first power adjusting amount of weak receiving end flexible direct current is subtracted with total power adjusting amount, it is flexible straight to obtain strong receiving end
Second power adjusting amount of stream.
3, the first power adjusting amount is added in the active power of the first flexible direct current receiving end, by the second power adjusting amount
It is added in the active power of the second flexible direct current receiving end, realizes final frequency stabilization control.
Optionally, this method also includes：When the active power of revised first flexible direct current receiving end is more than or equal to the
During the maximum active power of one flexible direct current receiving end, it is flexible that the active power that the first flexible direct current receiving end exceeds is transferred to second
Direct current receiving end, generate the active power of the first flexible direct current receiving end of reallocation and the active power of the second flexible direct current receiving end；
Wherein, the expression formula for the active power that the first flexible direct current receiving end exceeds is：M1=P1+ △ 1-N1；M1 represents that first is flexible
The active power that direct current receiving end exceeds, P1 represent the active power of the first flexible direct current receiving end, and Δ 1 represents the first regulated quantity, N1
Represent the maximum active power of the first flexible direct current receiving end.
Optionally, this method also includes：When the active power of revised second flexible direct current receiving end is more than or equal to the
During the maximum active power of two flexible direct current receiving ends, it is flexible that the active power that the second flexible direct current receiving end exceeds is transferred to first
Direct current receiving end, generate the active power of the first flexible direct current receiving end of reallocation and the active power of the second flexible direct current receiving end；
Wherein, the expression formula for the active power that the second flexible direct current receiving end exceeds is：M2=P2+ △ 2-N2；M2 represents that second is flexible
The active power that direct current receiving end exceeds, P2 represent the active power of the second flexible direct current receiving end, and Δ 2 represents the second regulated quantity, N2
Represent the maximum active power of the second flexible direct current receiving end.
It should be noted that in the application of reality, when the active power of revised first flexible direct current receiving end is more than
Or equal to the first flexible direct current receiving end maximum active power when, the active power that the first flexible direct current receiving end exceeds is transferred to
Second flexible direct current receiving end or to be more than or equal to second flexible straight when the active power of revised second flexible direct current receiving end
When flowing the maximum active power of receiving end, the active power that the second flexible direct current receiving end exceeds is transferred to the first flexible direct current receiving end
This flow is referred to as power transfer control；Hold power transfer control this flow be in order to prevent the first flexible direct current receiving end or
Second flexible direct current receiving end exceeds the first flexible direct current receiving end sheet due to the active power of revised first flexible direct current receiving end
The active power of the maximum active power of body or revised second flexible direct current receiving end exceeds the second flexible direct current receiving end sheet
The maximum active power of body, cause the first flexible direct current receiving end or the second flexible direct current receiving end to be in overload, cause to pacify
Full hidden danger.
The control method for coordinating for the mixed DC station control that the utility model embodiment provides works as the frequency of customary DC sending end
When disturbing, the power adjusting amount generated to the frequency-splitting of customary DC sending end is filtered so as to obtain the first flexibility directly
The first regulated quantity of receiving end is flowed, and the second regulated quantity of the second flexible direct current receiving end is generated by subtraction；Rather than existing
In technology directly according to the frequency-splitting of customary DC sending end generate power adjusting amount go correct the first flexible direct current receiving end and
Second flexible direct current receiving end, difference is there may be between the first flexible direct current receiving end and the second flexible direct current receiving end due to considering
It is different, therefore the first flexible direct current receiving end is modified using the first regulated quantity, the second flexible direct current receiving end is adjusted using second
Section amount is modified, so as to ensure that the frequency stabilization effect of each receiving end；Solve and use FREQUENCY CONTROL side in the prior art
The DC transmission system of method can not distribute rational algorithm for power modulation when carrying out frequency stabilization according to the actual situation of each receiving end
Amount, the problem of ensureing the frequency stabilization effect of each receiving end.
Embodiment two, embodiment of the present utility model provide a kind of cooperative control device 101 of mixed DC station control, such as
Include shown in Fig. 2：
Subtracter 1010, the first node a being connected with subtracter 1010, the first signal input part A and secondary signal are defeated
Enter to hold B, the bilateral frequency difference controller 1011 being connected with first node a, the section point being connected with bilateral frequency difference controller 1011
B, the power divider 1012 being connected with section point b, the first signal output part C being connected with power divider 1012 and second
Signal output part D；Subtracter 1010, for when the frequency of customary DC sending end disturbs, obtaining customary DC sending end
The difference of predeterminated frequency and the current frequency of customary DC sending end；Bilateral frequency difference controller 1011, for being obtained according to subtracter
Difference generation power adjusting amount；Power divider 1012, the power adjusting amount for being generated to bilateral frequency difference controller are carried out
Filtering obtains the first regulated quantity of the first flexible direct current receiving end, and generates the second of the second flexible direct current receiving end by subtraction
Regulated quantity, wherein the second regulated quantity subtracts the first regulated quantity equal to power adjusting amount, it is flexible according to the first regulated quantity amendment first
The active power of direct current receiving end, according to the active power of second regulated quantity amendment the second flexible direct current receiving end.
Optionally, cooperative control device 101 also includes：Receiving end power divider 1013, with receiving end power divider 1013
The 3rd signal input part E, the 3rd signal output part F and the 4th signal output part G of connection, connect with the 3rd signal output part F
The first adder 1014 connect, the first signal output part C being connected with first adder 1014 and the 3rd node c, with the 4th letter
The second adder 1015 of number output end G connections, the secondary signal output end D being connected with second adder 1015 and fourth node
d；Receiving end power divider 1013, it is additionally operable to obtain total active power of Hybrid HVDC system；Receiving end power divider
1013, it is additionally operable to total active power being distributed into the active power of the first flexible direct current receiving end and having for the second flexible direct current receiving end
Work(power；Wherein, total active power is equal to the active of active power and the second flexible direct current receiving end of the first flexible direct current receiving end
The sum of power.
Optionally, cooperative control device 10 also includes：Processor 1016；The 3rd node c that is connected with processor 1016,
Four node d, the 5th signal output part H and the 6th signal output part I；Processor 1016, for being corrected when first adder 1014
When the active power of the first flexible direct current receiving end afterwards is more than or equal to the maximum active power of the first flexible direct current receiving end, by the
The active power that one flexible direct current receiving end exceeds is transferred to the second flexible direct current receiving end, generate the first flexible direct current of reallocation by
The active power of the active power at end and the second flexible direct current receiving end；Wherein, the active power that the first flexible direct current receiving end exceeds
Expression formula be：M1=P1+ △ 1-N1；M1 represents the active power that the first flexible direct current receiving end exceeds, and P1 represents that first is soft
Property direct current receiving end active power, Δ 1 represent the first regulated quantity, N1 represent the first flexible direct current receiving end maximum active power.
Optionally, cooperative control device 10 also includes：Processor 1016；The 3rd node c that is connected with processor 1016,
Four node d, the 5th signal output part H and the 6th signal output part I；Processor 1016, for being corrected when second adder 1015
When the active power of the second flexible direct current receiving end afterwards is more than or equal to the maximum active power of the second flexible direct current receiving end, by the
The active power that two flexible direct current receiving ends exceed is transferred to the first flexible direct current receiving end, generate the first flexible direct current of reallocation by
The active power of the active power at end and the second flexible direct current receiving end；Wherein, the active power that the second flexible direct current receiving end exceeds
Expression formula be：M1=P2+ △ 2-N2；M2 represents the active power that the second flexible direct current receiving end exceeds, and P2 represents that second is soft
Property direct current receiving end active power, Δ 2 represent the second regulated quantity, N2 represent the second flexible direct current receiving end maximum active power.
The coordination control for the mixed DC station control that the utility model embodiment provides, when the frequency of customary DC sending end occurs
During disturbance, the power adjusting amount that is generated to the frequency-splitting of customary DC sending end be filtered so as to obtain the first flexible direct current by
First regulated quantity at end, and pass through the second regulated quantity of subtraction the second flexible direct current receiving end of generation；Rather than prior art
In directly according to the frequency-splitting of customary DC sending end generate power adjusting amount go correct the first flexible direct current receiving end and second
Flexible direct current receiving end, difference is there may be between the first flexible direct current receiving end and the second flexible direct current receiving end due to considering, because
This is modified to the first flexible direct current receiving end using the first regulated quantity, and the second flexible direct current receiving end is entered using the second regulated quantity
Row amendment, so as to ensure that the frequency stabilization effect of each receiving end；Solve in the prior art using the straight of control method for frequency
Transmission system is flowed when carrying out frequency stabilization, can not be distributed rational algorithm for power modulation amount according to the actual situation of each receiving end, be protected
The problem of demonstrate,proving the frequency stabilization effect of each receiving end.
Embodiment three, embodiment of the present utility model provide a kind of transmission system 10, including：As what embodiment two provided appoints
The cooperative control device 1011 of one mixed DC station control, it is connected with the cooperative control device 1011 of mixed DC station control normal
Advise direct current station and control the control 103 of the 102, first flexible direct current station and the second flexible direct current station control 104, connect with customary DC station control 102
The rectification side pole control 105 connect, the converter valve pole control 106 being connected with rectification side pole control 105, it is connected with converter valve pole control 106 normal
The converter valve 107 of direct current sending end is advised, the first inversion side pole control 108 being connected with the first flexible direct current station control 103, with the first inversion
The first modularization multi-level converter pole control 109 that side pole control 108 connects, with the first modularization multi-level converter pole control 109
The modularization multi-level converter 110 of first flexible direct current receiving end of connection, second be connected with the second flexible direct current station control 104
Inversion side pole control 111, the second modularization multi-level converter pole control 112 being connected with the second inversion side pole control 111, with the second mould
The modularization multi-level converter 113 of second flexible direct current receiving end of the connection of block multilevel converter pole control 112.
It should be noted that Fig. 4-a are three end Hybrid HVDC system structure diagrams, Fig. 4-b are that the mixing of three ends is straight
Flow control Rotating fields schematic diagram, Fig. 4-c are the control schematic diagram of cooperative control device in Fig. 4-b, and Fig. 4-d are frequency in Fig. 4-c
The control schematic diagram of control；Wherein, modularization multi-level converter (English full name in Fig. 4-b：Modular Multilevel
Converter, referred to as：MMC), cooperative control device turns including receiving end power distribution link, FREQUENCY CONTROL and power in Fig. 4-c
Move control.The cooperative control device is first according to the value and power reference P of scheduling settingplanOr the power reference that operations staff gives
Value PsetDetermine the total active power reference value P of three end Hybrid HVDC systemsin；Second step, by receiving end power distribution such as than
Example allocation model is to PinDecomposed, respectively obtain the active power reference value P of two flexible direct currentsMMC1_ref1、PMMC2_ref1；
3rd step, by FREQUENCY CONTROL according to sending frequency reference frefWith frequency measurement fmesBetween difference, calculate power
Regulated quantity PFLC, power adjusting amount passes through the power distribution based on filtering, obtains the respective power adjusting amount P of flexible direct currentMMC1_FLC
With PMMC2_FLC；Power adjusting amount is added in former value and power reference, obtains PMMC1_ref2、PMMC2_ref2；Finally, according to flexible straight
The capacity limit of stream, calculate power branch value and obtain final reference value PMMC1_ref3、PMMC2_ref3。
Cooperative control device is changed by increasing the power distribution control based on filtering to primary frequency control in Fig. 4-d
Enter.Primary frequency control limits comprising measurement filtering link (time constant is smaller), dead band link, proportional plus integral control link and output
Width link.In Fig. 4-d, T is measurement links time constant, typically takes smaller value, and s is differential operator, frefFor sending end frequency reference
Value, fmesFor frequency measurement, kp、kiFor the proportionality coefficient and integral coefficient of PI controls, the measured filtering of frequency departure signal
Link obtains the frequency departure signal for calculating, first passes around dead band link, if frequency difference is less than dead band, FREQUENCY CONTROL does not open
It is dynamic；If frequency difference is more than dead band, FREQUENCY CONTROL starts.After FREQUENCY CONTROL starts, first pass around PI controls and frequency departure is carried out
Processing, obtained result obtain the power adjusting amount P of FREQUENCY CONTROL together by output violent change linkFLC.Then, power distribution
Control uses first-order low-pass ripple (wherein TMMC1To distribute control time constant, higher value is typically taken) it will delay in algorithm for power modulation amount
Algorithm for power modulation amount P of the dynamic component of slow wave as flexible direct current 1MMC1_FLC, then by total modulation voltage PFLCSubtract PMMC1_FLCObtain phase
To the flexible direct current algorithm for power modulation amount P of rapid fluctuationsMMC2_FLC；Exemplary is all mutually with two flexible direct current receiving end capacity
2500MW, general power illustrates exemplified by being 5000MW, if frequency departure is 2Hz, by FREQUENCY CONTROL, PMMC1_FLCCan be
50MW, PMMC2_FLCCan be 150MW；Then, the active power of the first flexible direct current receiving end is 2500+50=2550MW, and second is soft
The active power of property direct current receiving end is 2500+150=2650MW.
Finally, cooperative control device controls to obtain algorithm for power modulation according to the FREQUENCY CONTROL of sending end AC system with power distribution
Amount, and the active power of flexible direct current is modified；The wattful power of two receiving end flexible direct currents is judged by power transfer control
Whether rate exceedes its maximum active power, if carrying out power transfer more than if, finally obtains final flexible direct current power, and under
Its respective pole control layer is dealt into, the quick regulation of the respective active power of mixing multiterminal element is realized, so as to ensure frequency stabilization
Effect.
The electric power system for the mixed DC station control that the utility model embodiment provides, when the frequency of customary DC sending end occurs
During disturbance, the power adjusting amount that is generated to the frequency-splitting of customary DC sending end be filtered so as to obtain the first flexible direct current by
First regulated quantity at end, and pass through the second regulated quantity of subtraction the second flexible direct current receiving end of generation；Rather than prior art
In directly according to the frequency-splitting of customary DC sending end generate power adjusting amount go correct the first flexible direct current receiving end and second
Flexible direct current receiving end, difference is there may be between the first flexible direct current receiving end and the second flexible direct current receiving end due to considering, because
This is modified to the first flexible direct current receiving end using the first regulated quantity, and the second flexible direct current receiving end is entered using the second regulated quantity
Row amendment, so as to ensure that the frequency stabilization effect of each receiving end；Solve in the prior art using the straight of control method for frequency
Transmission system is flowed when carrying out frequency stabilization, can not be distributed rational algorithm for power modulation amount according to the actual situation of each receiving end, be protected
The problem of demonstrate,proving the frequency stabilization effect of each receiving end.
It is described above, only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art can readily occur in change in the technical scope that the utility model discloses
Or replace, it should all cover within the scope of protection of the utility model.Therefore, the scope of protection of the utility model should be with the power
The protection domain that profit requires is defined.
Claims (4)
- A kind of 1. cooperative control device of mixed DC station control, it is characterised in that including：Subtracter, it is connected with the subtracter First node, the first signal input part and secondary signal input, be connected with the first node bilateral frequency difference control Device, the section point being connected with the bilateral frequency difference controller, the power divider being connected with the section point, with the work( The first signal output part and secondary signal output end of rate distributor connection.
- 2. the cooperative control device of mixed DC station control according to claim 1, it is characterised in that described to coordinate control dress Putting also includes：Receiving end power divider, the 3rd signal input part being connected with the receiving end power divider, the 3rd signal output End and the 4th signal output part, the first adder being connected with the 3rd signal output part, connect with the first adder The first signal output part and the 3rd node connect, the second adder being connected with the 4th signal output part, with described second The secondary signal output end and fourth node of adder connection.
- 3. the cooperative control device of mixed DC station control according to claim 1, it is characterised in that described to coordinate control dress Putting also includes：Processor；The 3rd node, fourth node, the 5th signal output part and the 6th signal being connected with the processor Output end.
- A kind of 4. transmission system, it is characterised in that including：The association of mixed DC station control as described in claim any one of 1-3 Control device is adjusted, the customary DC station being connected with the cooperative control device of mixed DC station control is controlled, the first flexible direct current Stand control and the second flexible direct current station control, with the customary DC station control connection rectification side pole control, with the rectification side pole control The converter valve pole control of connection, the converter valve with the customary DC sending end of converter valve pole control connection are flexible straight with described first First inversion side pole control of stream station control connection, the first modularization multi-level converter pole being connected with the first inversion side pole control Control, changed with the modular multilevel of the first flexible direct current receiving end of the first modularization multi-level converter pole control connection Device is flowed, the second inversion side pole control with the second flexible direct current station control connection, the be connected with the second inversion side pole control Two modularization multi-level converter poles are controlled, flexible straight with described the second of the second modularization multi-level converter pole control connection Flow the modularization multi-level converter of receiving end.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086590A (en) * | 2017-06-30 | 2017-08-22 | 南方电网科学研究院有限责任公司 | Coordination control method and device for hybrid direct-current station control and power transmission system |
| CN110401214A (en) * | 2019-07-04 | 2019-11-01 | 广西电网有限责任公司 | Multi-terminal hybrid direct-current power transmission system |
| CN112152204A (en) * | 2020-09-04 | 2020-12-29 | 南方电网科学研究院有限责任公司 | Multi-terminal direct-current single-pole fault power transfer method and device |
-
2017
- 2017-06-30 CN CN201720783527.5U patent/CN206932010U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086590A (en) * | 2017-06-30 | 2017-08-22 | 南方电网科学研究院有限责任公司 | Coordination control method and device for hybrid direct-current station control and power transmission system |
| CN107086590B (en) * | 2017-06-30 | 2023-11-17 | 南方电网科学研究院有限责任公司 | Coordination control method, device and power transmission system for hybrid direct current station control |
| CN110401214A (en) * | 2019-07-04 | 2019-11-01 | 广西电网有限责任公司 | Multi-terminal hybrid direct-current power transmission system |
| CN112152204A (en) * | 2020-09-04 | 2020-12-29 | 南方电网科学研究院有限责任公司 | Multi-terminal direct-current single-pole fault power transfer method and device |
| CN112152204B (en) * | 2020-09-04 | 2022-09-16 | 南方电网科学研究院有限责任公司 | Multi-terminal direct-current single-pole fault power transfer method and device |
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Effective date of registration: 20210609 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China South Power Grid International Co.,Ltd. Address before: 510080 West Tower 13-20 Floor, Shui Jungang 6 and 8 Dongfeng East Road, Yuexiu District, Guangzhou City, Guangdong Province Patentee before: China South Power Grid International Co.,Ltd. Patentee before: POWER GRID TECHNOLOGY RESEARCH CENTER. CHINA SOUTHERN POWER GRID |