CN108306316A - Positive-negative sequence coordinated control systems and method of the chain type STATCOM in unbalanced source voltage - Google Patents
Positive-negative sequence coordinated control systems and method of the chain type STATCOM in unbalanced source voltage Download PDFInfo
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- CN108306316A CN108306316A CN201810138597.4A CN201810138597A CN108306316A CN 108306316 A CN108306316 A CN 108306316A CN 201810138597 A CN201810138597 A CN 201810138597A CN 108306316 A CN108306316 A CN 108306316A
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The positive-negative sequence coordinated control system and method that the invention discloses a kind of chain type STATCOM in unbalanced source voltage, including：Synchronized phase open loop detection module, global DC voltage control module, positive sequence reactive-load compensation current calculation module, positive sequence reactive command current calculation module, forward-order current decoupling control module, negative phase-sequence separation and negative sequence voltage computing module, the control of power module mean direct voltage and voltage instruction synthesis, phase shift carrier modulation block.The present invention copes with the random perturbation of electric network voltage phase using advanced grid phase open loop synchronisation control means, the phase sequence of output voltage and network voltage to chain type STATCOM device is detached in real time, it discloses positive and negative order components and coordinates the angle of phase displacement met needed for control, modulation ratio both sides relationship, give positive and negative order components control method for coordinating of chain type STATCOM device under the conditions of unbalanced source voltage.
Description
Technical field
The invention belongs to power quality controlling field, more particularly to a kind of chain type STATCOM is in unbalanced source voltage
Positive-negative sequence control method for coordinating.
Background technology
The control claimed apparatus of chain type STACOM can quickly respond the reactive requirement of load, while also ensure device
The safe and stable operation of itself.When being especially applied to public electric wire net, device allows for bearing the impact of the system failure, is being
System is continually and steadily run during restoring, and is provided timely and effectively dynamic reactive and supported.If STATCOM device only into
Row positive sequence voltage controls, then 10% or so electrical network negative phase-sequence voltage may result in the most high point that device output current is more than device
If power-off stream, without controlling accordingly, also can when serious unbalanced fault occurs for power grid, and system voltage is caused to decline rapidly
Lead to STATCOM device overcurrent, these operating modes can threaten the safe operation of device.
The control strategy of chain type STATCOM device mainly has：Current decoupled control, decoupled active and reactive control and it is non-thread
Property control etc., these research mostly be based on system be three-phase symmetrical under conditions of.However, lightning stroke, switching overvoltage, not right
Claim the various disturbances such as short trouble and dissymmetrical load mutation, network voltage will be caused asymmetric, and then influence STATCOM's
Normal operation.If not being directed to asymmetric operating mode to control effectively, device will will produce out-of-balance current, and system loss is caused to increase
Greatly, runnability decline, when serious device may break down protection and it is out of service, or even can directly result in device damage.
Switch function method has analysed in depth harmful effect of the unbalanced source voltage to chain type STATCOM.However, unbalanced power supply is run
Period, but exactly device plays the crucial moment that reactive power support acts on.At this point, should consider the lasting peace of device itself first
Total stability, next, which is only, makes device play a role, and reliable and stable reactive power support is provided for system.Work as unbalanced source voltage
When, existing way is typically first out of service with protective device before power system restoration is normal, and waiting is put into again.However, big
The grid-connected making process of capacity STATCOM device is more complicated, and frequent switching is unfavorable for its peace in the failure process of short time
Row for the national games, therefore, it is desirable to STATCOM, and grid-connected work is remained able in unbalanced source voltage.On this basis, feedback linearization
Change sliding-mode control to be used to realize that positive-negative sequence is full decoupled, however this method calculates complicated, parameter tuning difficulty, Wu Faying
For commercial plant.The residual voltage computational methods of star chain type STATCOM based on equivalent susceptance converter technique are static in two-phase
Out-of-balance current tracing control is completed under coordinate system, but does not account for currently used Y types connection type.
Invention content
When unbalanced source voltage, STATCOM will be made only to export just for the control strategy of grid balance operating condition design
Sequence voltage, the negative sequence component in network voltage are likely to result in device overcurrent and out of service, the purpose of the present invention is to provide
A kind of positive-negative sequence control method for coordinating of chain type STATCOM in unbalanced source voltage, the method achieve to chain type
Positive-negative sequence separation and the coordination of STATCOM output voltages control, by the way that the output voltage of device is decomposed into positive sequence and negative phase-sequence two
Part controls, and realizes positive-negative sequences of the complete chain type STATCOM in unbalanced source voltage and coordinates control.
Technical solution of the present invention carries out as described below.
A kind of positive and negative order components coordinated control system of chain type STATCOM in unbalanced source voltage, including power grid are same
Step phase open loop detection module, global DC voltage control module, positive sequence reactive-load compensation current calculation module, positive sequence is idle
Instruction current computing module, forward-order current decoupling control module, negative phase-sequence separation module, negative sequence voltage computing module, power module
Mean direct voltage control module and voltage instruction synthesis and phase shift carrier modulation block；
The synchronized phase open loop detection module, the power grid electricity for being detected according to Hall voltage sensor
Pressure, obtains the real-time phase θ of network voltage；
The positive sequence reactive-load compensation current calculation module, for detecting STATCOM outputs according to Hall current sensor
Three-phase current ica、icb、icc, obtain the positive sequence compensation electric current i that STATCOM is exported under dq coordinate systems+ cd、i+ cq；
The positive sequence reactive command current calculation module, the threephase load for being detected according to Hall current sensor
Electric current ila、ilb、ilc, and the signal that q axis is exported is as the positive sequence reactive-load compensation current instruction value i of chain type STATCOM device+ qref；
The global DC capacitor voltage control module, for detecting STATCOM according to 3N Hall voltage sensor
The DC capacitor voltage value of each power cell, N are the power cell quantity per phase, utilize DC capacitor voltage control algorithm
Obtain the d axis positive sequence compensation current instruction values i of chain type STATCOM device+ dref；
The forward-order current decoupling control module is used for according to positive sequence reactive-load compensation current calculation module, positive sequence is idle
The output current signal of instruction current computing module and global DC capacitor voltage control module, utilizes forward-order current decoupling control
Algorithm obtains positive sequence output voltage command value u of the STATCOM device under dq coordinate systems+ cd、u+ cq；
The negative phase-sequence separation module, for obtaining power grid under dq coordinate systems according to the network voltage and phase theta that detect
Negative sequence voltage u- sd、u- sq；
The negative sequence voltage computing module, for according to the defeated of negative phase-sequence separation module and forward-order current decoupling control module
Go out voltage signal, generates the negative sequence component signal under coordination control strategy；
The voltage instruction synthesis and phase shift carrier modulation block are used for according to forward-order current decoupling control module, bear
The output signal of sequence voltage computing module and module average voltage DC control module generates the pwm control signal of inverter,
It carries out positive-negative sequences of the chain type STATCOM in unbalanced source voltage and coordinates control.
A kind of positive-negative sequence control method for coordinating of chain type STATCOM in unbalanced source voltage, includes the following steps：
(1) it utilizes Hall voltage sensor to detect network voltage, and passes through synchronized phase open loop detection module
Detect the real-time phase θ of network voltage；
(2) the three-phase current i of Hall current sensor detection STATCOM outputs is utilizedca、icb、icc, and be entered into
Positive sequence reactive-load compensation current calculation module obtains the positive sequence compensation electric current i that STATCOM is exported under dq coordinate systems+ cd、i+ cq；
(3) Hall current sensor detection threephase load electric current i is utilizedla、ilb、ilc, and it is entered into the idle finger of positive sequence
Current calculation module is enabled, and the signal that q axis is exported is as the q axis positive sequence reactive-load compensation current-orders of chain type STATCOM device
Value i+ qref；
(4) 3N Hall voltage sensor is utilized to detect the DC capacitor voltage value of each power cells of STATCOM, and
It is entered into global DC capacitor voltage control module, N is power cell quantity of the device per phase, utilizes DC capacitor voltage
The active compensation current instruction value i of d axis positive sequences of chain type STATCOM can be calculated in control algolithm+ dref；
(5) using the output current signal of step (1)~(4) as the input signal of forward-order current decoupling control module, profit
Positive sequence output voltage command value u of the STATCOM device under dq coordinate systems is obtained with forward-order current Uncoupling Control Based+ cd、u+ cq；
(6) network voltage detected and its phase theta are obtained into the negative phase-sequence of power grid under dq coordinate systems through negative phase-sequence separation module
Voltage u- sd、u- sq；
(7) it using step (5), the output signal of (6) as the input signal of negative sequence voltage computing module, obtains coordinating control
Negative sequence component under strategy；
(8) by the output of step (5), (7) and module average voltage DC control module, as voltage instruction synthesis and
The input signal of phase shift carrier modulation block generates the pwm control signal of inverter, carries out chain type STATCOM in network voltage
Positive-negative sequence when uneven coordinates control.
In step (2), the expression formula of positive sequence reactive-load compensation current calculation module is as follows：
In step (3), positive sequence reactive command Current calculation formula is as follows：
In step (4), the DC capacitor voltage of the 3N H bridge module detected is subjected to summation operation udc_sum, then by its
With 3N times of DC capacitor voltage command value 3Nudc_refIt makes the difference, finally transports the deviation voltage value by pi regulator
After calculation, the d axis positive sequence compensation current instruction values i under dq coordinate systems is obtained+ dref；Wherein,
udc_ai、udc_bi、udc_ciRespectively actual samples to A, B, C three-phase in DC capacitor electricity per phase i-th of module
Pressure, N are the number per phase H bridge modules.
In step (5), forward-order current Uncoupling Control Based specific formula for calculation is as follows：
Wherein, U+ cFor the positive sequence voltage of inverter output, δ+Positive sequence voltage for inverter output is ahead of power grid positive sequence
The angle of phase displacement of voltage.
In step (6), the specific formula for calculation of negative phase-sequence separation module is as follows：
Wherein, U- sFor electrical network negative phase-sequence voltage, the phase difference between β negative sequence components and positive-sequence component.
The calculation formula of the negative sequence voltage computing module is as follows：
Wherein, U+ cFor the positive sequence voltage of inverter output, U— sFor the negative sequence voltage of power grid, β is negative sequence component and positive sequence point
Phase difference between amount, δ+The angle of phase displacement of power grid positive sequence voltage is ahead of for the positive sequence voltage of inverter output.
Positive-negative sequences of the chain type STATCOM in unbalanced source voltage coordinates control planning：
δ+=δ-
Wherein, m+、m-Respectively positive sequence, the modulation ratio of negative sequence voltage of inverter output, U+ s、U— sRespectively power grid is being just
Sequence, negative sequence voltage, δ+The angle of phase displacement of power grid positive sequence voltage, δ are ahead of for the positive sequence voltage of inverter output-It is exported for inverter
Negative sequence voltage be ahead of the angle of phase displacement of electrical network negative phase-sequence voltage.
Through the above technical solutions, beneficial effects of the present invention are：
The problem of control system of the present invention, chain type STATCOM device when surrounding unbalanced source voltage controls, pass through profit
The disturbance of electric network voltage phase is coped with advanced grid phase open loop synchronisation control means, is realized to device output voltage
And the phase sequence separation of network voltage, it realizes and the positive-negative sequence separation of chain type STATCOM output voltages is controlled with coordination, pass through
Device is decomposed into positive sequence and the control of negative phase-sequence two parts, and from the angle analysis of power-balance, has obtained positive-negative sequence and has coordinated control
Relationship of both the angle of phase displacement of satisfaction, modulation ratio needed for system, it is proposed that complete chain type STATCOM is in unbalanced source voltage
When positive-negative sequence control method for coordinating.
The control method of the present invention copes with power grid first with advanced electric network voltage phase open loop synchronisation control means
The disturbance of voltage-phase realizes the phase sequence separation to device output voltage and network voltage, realizes to chain type STATCOM
Positive-negative sequence separation and the coordination of output voltage control, by the way that device is decomposed into positive sequence and the control of negative phase-sequence two parts, by positive sequence electricity
The output signal of decoupling control module, negative sequence voltage computing module and module average voltage DC control module is flowed as voltage
The input signal of instruction synthesis and phase shift carrier modulation block, you can the pwm control signal for generating inverter, to realize chain
Positive and negative order components of the formula STATCOM in unbalanced source voltage coordinate control.This method has good reply system uneven
The ability of weighing apparatus, under system voltage asymmetry and the operating mode of phase perturbation, device can steadily be run, and reach benefit simultaneously
Repay idle requirement.
Description of the drawings
Fig. 1 is Y shape chain H bridge type STATCOM main circuit structure figures；
Fig. 2 is that positive-negative sequences of the chain type STATCOM in unbalanced source voltage coordinates control block diagram in the present invention；
Fig. 3 is the DC capacitor voltage control algorithm block diagram of the overall situation；
Fig. 4 is forward-order current Uncoupling Control Based block diagram；
Fig. 5 is network voltage simulation waveform (network voltage contains 30% negative sequence component) figure；
Fig. 6 is STATCOM output current curve graphs when not coordinating control；
Fig. 7 is STATCOM output current curve graphs when coordinating control；
Fig. 8 is the degree of unbalancedness curve graph of STATCOM output currents；
Fig. 9 is the reactive component curve graph of system power under dq coordinate systems.
Specific implementation mode
Positive-negative sequence coordinated control system such as attached drawings of the chain type STATCOM of the present invention in unbalanced source voltage
Shown in 2, including：Synchronized phase open loop detection module, global DC voltage control module, positive sequence reactive-load compensation electric current
Computing module, positive sequence reactive command current calculation module, forward-order current decoupling control module, negative phase-sequence separation and negative sequence voltage calculate
Module, the control of power module mean direct voltage and voltage instruction synthesis, phase shift carrier modulation block.Utilize advanced power grid phase
Position open loop synchronisation control means copes with the disturbance of electric network voltage phase, realizes to device output voltage and network voltage
Phase sequence detaches, and realizes and is controlled with coordination the positive-negative sequence separation of chain type STATCOM output voltages, by the way that device to be decomposed into just
Sequence and the control of negative phase-sequence two parts, and then realize positive-negative sequences of the chain type STATCOM in unbalanced source voltage and coordinate control.
The following contents is by the substantially former of the positive-negative sequence control method for coordinating to chain type STATCOM in unbalanced source voltage
Reason is described in detail：
Positive-negative sequence control method for coordinating of the chain type STATCOM in unbalanced source voltage is as follows：
(1) it utilizes Hall voltage sensor to detect network voltage, and passes through synchronized phase open loop detection module
Detect the real-time phase θ of network voltage；The phase information of whole system is provided by synchronized phase open loop detecting method；
(2) the three-phase current i of Hall current sensor detection STATCOM outputs is utilizedca、icb、icc, and be entered into
Positive sequence reactive-load compensation current calculation module, you can obtain the forward-order current i that STATCOM is exported under dq coordinate systems+ cd、i+ cq；Positive sequence
The expression formula of reactive-load compensation current calculation module is as follows：
(3) Hall current sensor detection threephase load electric current i is utilizedla、ilb、ilc, and it is entered into the idle finger of positive sequence
Current calculation module is enabled, and the signal that q axis is exported is as the positive sequence reactive-load compensation current instruction value i of chain type STATCOM device+ qref；Positive sequence reactive command Current calculation formula is as follows：
(4) 3N Hall voltage sensor is utilized to detect the DC capacitor voltage value of each power cells of STATCOM, and
It is entered into global DC capacitor voltage control module, chain type can be calculated using DC capacitor voltage control algorithm
The d axis positive sequence compensation current instruction values i of STATCOM device+ dref；Global DC capacitor voltage control algorithm is as shown in Figure 3；Its
Basic principle is with step：The DC capacitor voltage of the 3N H bridge module detected is subjected to summation operation udc_sum, next
By its DC capacitor voltage command value 3Nu with 3N timesdc_refMake the difference, finally by the deviation voltage value by pi regulator into
After row operation, you can obtain the d axis positive sequence compensation current instruction values i under dq coordinate systems+ dref；Wherein,
udc_ai、udc_bi、udc_ciRespectively actual samples to A, B, C three-phase in DC capacitor electricity per phase i-th of module
Pressure, N are the number per phase H bridge modules.
(5) using the output current signal of step (1)~(4) as the input signal of forward-order current decoupling control module, profit
Positive sequence output voltage command value u of the STATCOM device under dq coordinate systems is can be obtained with forward-order current Uncoupling Control Based+ cd、
u+ cq, specific formula for calculation is as follows：
Wherein, U+ cFor the positive sequence voltage of inverter output, δ+Positive sequence voltage for inverter output is ahead of power grid positive sequence
The angle of phase displacement of voltage；Forward-order current Uncoupling Control Based is as shown in Figure 4.
(6) network voltage detected and phase theta are obtained into the negative phase-sequence electricity of power grid under dq coordinate systems through negative phase-sequence separation module
Press u- sd、u- sq, specific formula for calculation is as follows：
Wherein U- sFor electrical network negative phase-sequence voltage, the phase difference between β negative sequence components and positive-sequence component；
(7) it using step (5), the output signal of (6) as the input signal of negative sequence voltage computing module, and then realizes and coordinates
Negative sequence component under control strategy, specific formula for calculation are as follows：
Wherein, U+ cFor the positive sequence voltage of inverter output, U— sFor the negative sequence voltage of power grid, β is negative sequence component and positive sequence point
Phase difference between amount, δ+The angle of phase displacement of power grid positive sequence voltage is ahead of for the positive sequence voltage of inverter output.
(8) by the output of step (5), (7) and module average voltage DC control module, as voltage instruction synthesis and
The input signal of phase shift carrier modulation block, you can the pwm control signal for generating inverter, to realize that chain type STATCOM exists
Positive-negative sequence when unbalanced source voltage coordinates control.
In addition, the emulation by building positive-negative sequence control method for coordinating of the chain type STATCOM in unbalanced source voltage
Model carries out simulating, verifying to this method, and simulation result also confirms the correctness and validity of the program simultaneously.
Network voltage in 0.14s to the negative sequence component for increasing 30% between 0.18s suddenly, between positive sequence, negative sequence component
Phase difference be 300；Result shown in fig. 6 is to be not added with the electric current that device is flowed through when negative phase-sequence control, and Fig. 7 is to coordinate to control in positive-negative sequence
Device current waveform under mode processed, Fig. 8 are the degrees of unbalancedness of electric current shown in Fig. 7, Fig. 9 be at this time system power in dq coordinate systems
Reactive component after lower decomposition.As it can be seen that under positive-negative sequence coordinated control mode, the negative phase-sequence ingredient for flowing through the electric current of device obtains
It efficiently controlling, current unbalance factor is relatively low, and the reactive component of system power is zero, is slightly disturbed near system disturbance point,
STATCOM still completes the idle function of compensation positive sequence.
Method proposed by the invention has the unbalanced ability of good reply electric system, in system voltage asymmetry
And under the operating mode of phase perturbation, chain type STATCOM device can be made to run with security and stability, and reach high-performance compensation simultaneously
Idle requirement has good application value.
The above content is combine specific case it is made for the present invention be further described, and it cannot be said that the present invention
Specific implementation mode is only limitted to this, for those of ordinary skill in the art to which the present invention belongs, is not departing from the present invention
Under the premise of design, several simple deduction or replace can also be made, all shall be regarded as belonging to the right that the present invention is submitted
The scope of patent protection that claim determines.
Claims (9)
1. a kind of positive and negative order components coordinated control systems of chain type STATCOM in unbalanced source voltage, it is characterised in that：Packet
Include synchronized phase open loop detection module, global DC voltage control module, positive sequence reactive-load compensation current calculation module,
Positive sequence reactive command current calculation module, forward-order current decoupling control module, negative phase-sequence separation module, negative sequence voltage computing module,
Power module mean direct voltage control module and voltage instruction synthesis and phase shift carrier modulation block；
The synchronized phase open loop detection module, the network voltage for being detected according to Hall voltage sensor,
Obtain the real-time phase θ of network voltage；
The positive sequence reactive-load compensation current calculation module, for detecting the three of STATCOM outputs according to Hall current sensor
Phase current ica、icb、icc, obtain the positive sequence compensation electric current i that STATCOM is exported under dq coordinate systems+ cd、i+ cq；
The positive sequence reactive command current calculation module, the threephase load electric current for being detected according to Hall current sensor
ila、ilb、ilc, and the signal that q axis is exported is as the positive sequence reactive-load compensation current instruction value i of chain type STATCOM device+ qref；
The global DC capacitor voltage control module, it is each for detecting STATCOM according to 3N Hall voltage sensor
The DC capacitor voltage value of power cell, N are the power cell quantity per phase, are obtained using DC capacitor voltage control algorithm
The d axis positive sequence compensation current instruction values i of chain type STATCOM device+ dref；
The forward-order current decoupling control module, for according to positive sequence reactive-load compensation current calculation module, positive sequence reactive command
The output current signal of current calculation module and global DC capacitor voltage control module, utilizes forward-order current Uncoupling Control Based
Obtain positive sequence output voltage command value u of the STATCOM device under dq coordinate systems+ cd、u+ cq；
The negative phase-sequence separation module, for obtaining the negative of power grid under dq coordinate systems according to the network voltage that detects and phase theta
Sequence voltage u- sd、u- sq；
The negative sequence voltage computing module, for the output electricity according to negative phase-sequence separation module and forward-order current decoupling control module
Signal is pressed, the negative sequence component signal under coordination control strategy is generated；
The voltage instruction synthesis and phase shift carrier modulation block, for according to forward-order current decoupling control module, negative phase-sequence electricity
It presses the output signal of computing module and module average voltage DC control module to generate the pwm control signal of inverter, carries out
Positive-negative sequences of the chain type STATCOM in unbalanced source voltage coordinates control.
2. a kind of positive-negative sequence control method for coordinating of chain type STATCOM in unbalanced source voltage, which is characterized in that including with
Lower step：
(1) it utilizes Hall voltage sensor to detect network voltage, and is detected by synchronized phase open loop detection module
The real-time phase θ of network voltage；
(2) the three-phase current i of Hall current sensor detection STATCOM outputs is utilizedca、icb、icc, and it is entered into positive sequence
Reactive-load compensation current calculation module obtains the positive sequence compensation electric current i that STATCOM is exported under dq coordinate systems+ cd、i+ cq；
(3) Hall current sensor detection threephase load electric current i is utilizedla、ilb、ilc, and it is entered into positive sequence reactive command electricity
Stream calculation module, and the signal that q axis is exported is as the q axis positive sequence reactive-load compensation current instruction values i of chain type STATCOM device+ qref；
(4) utilize the DC capacitor voltage value of 3N Hall voltage sensor detection each power cells of STATCOM, and by its
It is input to global DC capacitor voltage control module, N is power cell quantity of the device per phase, utilizes DC capacitor voltage control
The active compensation current instruction value i of d axis positive sequences of chain type STATCOM can be calculated in algorithm+ dref；
(5) using the output current signal of step (1)~(4) as the input signal of forward-order current decoupling control module, using just
Sequence current decoupled control algorithm obtains positive sequence output voltage command value u of the STATCOM device under dq coordinate systems+ cd、u+ cq；
(6) network voltage detected and its phase theta are obtained into the negative sequence voltage of power grid under dq coordinate systems through negative phase-sequence separation module
u- sd、u- sq；
(7) using step (5), the output signal of (6) as the input signal of negative sequence voltage computing module, coordination control strategy is obtained
Under negative sequence component；
(8) by the output of step (5), (7) and module average voltage DC control module, as voltage instruction synthesis and phase shift
The input signal of carrier modulation block generates the pwm control signal of inverter, carries out chain type STATCOM in network voltage injustice
Positive-negative sequence when weighing apparatus coordinates control.
3. a kind of positive-negative sequences of the chain type STATCOM according to claim 2, in unbalanced source voltage coordinates control
Method, it is characterised in that：
In step (2), the expression formula of positive sequence reactive-load compensation current calculation module is as follows：
4. a kind of positive-negative sequences of the chain type STATCOM according to claim 2, in unbalanced source voltage coordinates control
Method, it is characterised in that：
In step (3), positive sequence reactive command Current calculation formula is as follows：
5. a kind of positive-negative sequences of the chain type STATCOM according to claim 2, in unbalanced source voltage coordinates control
Method, it is characterised in that：
In step (4), the DC capacitor voltage of the 3N H bridge module detected is subjected to summation operation udc_sum, then by itself and 3N
DC capacitor voltage command value 3Nu againdc_refMake the difference, finally by the deviation voltage value by pi regulator carry out operation it
Afterwards, the d axis positive sequence compensation current instruction values i under dq coordinate systems is obtained+ dref；Wherein,
udc_ai、udc_bi、udc_ciRespectively actual samples to A, B, C three-phase in DC capacitor voltage per phase i-th of module, N
For the number of every phase H bridge modules.
6. a kind of positive-negative sequences of the chain type STATCOM according to claim 2, in unbalanced source voltage coordinates control
Method, it is characterised in that：
In step (5), forward-order current Uncoupling Control Based specific formula for calculation is as follows：
Wherein, U+ cFor the positive sequence voltage of inverter output, δ+Positive sequence voltage for inverter output is ahead of power grid positive sequence voltage
Angle of phase displacement.
7. a kind of positive-negative sequences of the chain type STATCOM according to claim 2, in unbalanced source voltage coordinates control
Method, it is characterised in that：
In step (6), the specific formula for calculation of negative phase-sequence separation module is as follows：
Wherein, U- sFor electrical network negative phase-sequence voltage, the phase difference between β negative sequence components and positive-sequence component.
8. a kind of positive-negative sequences of the chain type STATCOM according to claim 2, in unbalanced source voltage coordinates control
Method, it is characterised in that：
The calculation formula of the negative sequence voltage computing module is as follows：
Wherein, U+ cFor the positive sequence voltage of inverter output, U— sFor the negative sequence voltage of power grid, β be negative sequence component and positive-sequence component it
Between phase difference, δ+The angle of phase displacement of power grid positive sequence voltage is ahead of for the positive sequence voltage of inverter output.
9. a kind of positive-negative sequences of the chain type STATCOM according to claim 2, in unbalanced source voltage coordinates control
Method, it is characterised in that：Positive-negative sequences of the chain type STATCOM in unbalanced source voltage coordinates control planning：
δ+=δ-
Wherein, m+、m-Respectively positive sequence, the modulation ratio of negative sequence voltage of inverter output, U+ s、U— sRespectively the positive sequence of power grid,
Negative sequence voltage, δ+The angle of phase displacement of power grid positive sequence voltage, δ are ahead of for the positive sequence voltage of inverter output-For the negative of inverter output
Sequence voltage is ahead of the angle of phase displacement of electrical network negative phase-sequence voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810138597.4A CN108306316B (en) | 2018-02-10 | 2018-02-10 | Positive and negative sequence coordination control system and method for chain type STATCOM in power grid voltage unbalance |
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| CN111475929A (en) * | 2020-03-20 | 2020-07-31 | 广西电网有限责任公司电力科学研究院 | Inversion verification method and system based on monitoring data of power distribution network real-world test platform |
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