CN112467759B - Control method and system of distributed power flow controller under low-current working condition - Google Patents
Control method and system of distributed power flow controller under low-current working condition Download PDFInfo
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- CN112467759B CN112467759B CN202110118875.1A CN202110118875A CN112467759B CN 112467759 B CN112467759 B CN 112467759B CN 202110118875 A CN202110118875 A CN 202110118875A CN 112467759 B CN112467759 B CN 112467759B
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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
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses a control method and a control system of a distributed power flow controller under a low-current working condition. The invention comprises the following steps: 1) when the DPFC is in a starting stage, the converter valve is not unlocked, and when the effective value of the current flowing through the DPFC is judged to be more than the minimum limit value for more than 1 minute, the current is considered to be stabilized above the minimum limit value, the condition of reliable energy taking is met, the converter valve is allowed to be unlocked, and the converter valve is operated to unlock; 2) when the DPFC is in steady-state operation, if the output voltage of the DPFC is smaller than the rated value and the effective value of the current flowing through the DPFC is lower than the minimum limit value, firstly, the DPFC is adjusted to present a capacitive impedance state, and then the output voltage of the DPFC is adjusted to enable the line current to be always larger than the minimum limit value plus delta I. The invention can prevent the DPFC from losing control under the low current working condition so as to influence the safety of primary equipment of the DPFC and the reliable power supply of an alternating current line, and ensure the reliable start or restart of the DPFC after the current returns to a normal value.
Description
Technical Field
The invention belongs to the field of distributed power flow control, and particularly relates to a control method and a control system of a distributed power flow controller under a low-current working condition.
Background
With the continuous expansion of high-voltage direct-current transmission and new energy power generation in the scale of power grid access, the problems of tide control and flexible new energy consumption after a large-capacity power supply is hierarchically connected into the power grid are increasingly prominent, the phenomena of large tide fluctuation and unbalanced distribution are serious in the operation process of the power grid, the important and key power supply section limit is low, the bottleneck of power supply capacity restriction of the power grid is formed, and meanwhile, the low operation efficiency of the power grid asset is also caused.
At present, the main mode for solving the problems of power supply bottleneck and section overrun is to strengthen the construction of a power grid, and the problems are solved by exploring measures such as a unified power flow controller in partial areas, so that the problems of long construction period, large investment, large occupied area and the like exist, and the problems of power grid operation and investment benefit cannot be considered in comprehensive evaluation, so that a novel technical means for improving the power flow transmission capacity of an alternating current system is necessary to be researched, and the operation efficiency and the safety and stability of the power grid are improved.
Distributed Power Flow Controllers (DPFCs) are a novel flexible Power Flow control device, can be applied to a Power transmission network, can be installed in a transformer substation in a Distributed mode, and have the functions of optimizing system operation, balancing and optimizing Power Flow distribution, limiting Power Flow section overload, inhibiting Power oscillation and subsynchronous resonance. The DPFC is applied to the power transmission and distribution network, so that the tidal current transmission capacity of a local power grid is effectively improved, and the operation efficiency and the safety and stability of the power grid are improved.
Receive the distributed influence, the DPFC unit adopts the self-energy-taking mode that does not have external power supply usually, at DPFC starting phase, utilizes main loop CT secondary energy supply, treats that DPFC gets into the steady operation stage, by the two energy supply return circuits energy supply of main loop CT secondary energy supply + submodule piece electric capacity voltage energy-taking. In order to ensure the reliability of self-energy extraction of the DPFC, a proper control strategy needs to be designed aiming at the low-current working condition.
At present, scholars at home and abroad have not studied the control strategy aspect of the distributed power flow controller under the low-current working condition.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the defects existing in the prior art, and provide a control method and system under a low current working condition of a distributed power flow controller, so as to prevent the DPFC from losing control under the low current working condition, thereby affecting the safety of the primary equipment of the DPFC and the reliable power supply of an alternating current line, and ensure the reliable start or restart of the DPFC after the current returns to a normal value.
Therefore, the invention adopts the following technical scheme: a control method of a distributed power flow controller under a low-current working condition comprises the following steps:
1) control of low current during start-up
When the DPFC is in a starting stage, the converter valve is not unlocked, and when the effective value of the current flowing through the DPFC is judged to be more than the minimum limit value for more than 1 minute, the current is considered to be stabilized above the minimum limit value, the condition of reliable energy taking is met, the converter valve is allowed to be unlocked, and the converter valve is operated to unlock;
2) control of low current after steady state operation
When the DPFC is in steady-state operation, if the output voltage of the DPFC is smaller than the rated value and the effective value of the current flowing through the DPFC is lower than the minimum limit value, the DPFC is adjusted to be in a capacitive impedance state firstly, and then the output voltage of the DPFC is adjusted to enable the line current to be always larger than the minimum limit value plus Delta I, wherein the unit of Delta I is A.
Furthermore, the value range of the delta I is 20-100A.
Further, in the control of low current after steady-state operation, if the DPFC outputs capacitive impedance and the output voltage is equal to the rated value, the line current is still the lowest limit value, the low-current protection action of the DPFC is triggered, the converter valve is locked, and the DPFC is bypassed.
Furthermore, in the control of low current after steady-state operation, after the DPFC is bypassed, when the line current is recovered to be more than the minimum value plus delta I for t seconds, the control protection system of the DPFC considers that the sub-module of the DPFC can normally take energy, and the DPFC is put into unlocking operation again, wherein the value of t is determined by the line current value after the steady state is recovered, and the larger the line current value is, the shorter t is.
Still further, t has a value ranging from 1s to 5 min.
Further, in the control of low current in the starting stage, if the current is lower than the lowest limit value, the timing is restarted for more than 1 minute after the current is higher than the lowest limit value next time, and if the current is always stable above the lowest limit value, the converter valve is allowed to be unlocked.
The other technical scheme adopted by the invention is as follows: a control system of a distributed power flow controller under a low-current working condition comprises:
1) control module with low current in starting stage
When the DPFC is in a starting stage, the converter valve is not unlocked, and when the effective value of the current flowing through the DPFC is judged to be more than the minimum limit value for more than 1 minute, the current is considered to be stabilized above the minimum limit value, the condition of reliable energy taking is met, the converter valve is allowed to be unlocked, and the converter valve is operated to unlock; if the current is lower than the minimum limit value, restarting timing for more than 1 minute after the current is higher than the minimum limit value next time, and if the current is always stable above the minimum limit value, allowing the converter valve to be unlocked;
2) control module for low current after steady state operation
When the DPFC is in steady-state operation, if the output voltage of the DPFC is smaller than the rated value and the effective value of the current flowing through the DPFC is lower than the minimum limit value, the DPFC is adjusted to be in a capacitive impedance state firstly, and then the output voltage of the DPFC is adjusted to enable the line current to be always larger than the minimum limit value plus Delta I, wherein the unit of Delta I is A.
The invention has the following beneficial effects: the invention can effectively prevent the DPFC from losing control under the low-current working condition so as to influence the safety of primary equipment of the DPFC and the reliable power supply of an alternating current line, and ensure the reliable start or restart of the DPFC after the current returns to a normal value. The invention can effectively improve the tidal current transmission capacity of the local power grid and improve the operation efficiency and the safety and the stability of the power grid.
Drawings
Fig. 1 is a primary wiring diagram of a two-wire distributed power flow controller according to the present invention;
FIG. 2 is a control flow chart of the present invention for low current conditions during the startup phase of the DPFC;
FIG. 3 is a flow chart illustrating the control of the low current condition after steady state operation of the DPFC of the present invention.
Detailed Description
The technical scheme of the invention is more clearly and completely described below by combining the embodiment and the attached drawings of the specification.
Fig. 1 is a primary wiring diagram of a two-wire DPFC, which includes multiple stages of sub-modules and a common switch area, wherein a first line is connected in series with a first DPFC, a second line is connected in series with a second DPFC, and the first line and the second line are connected to a first ac bus and a second ac bus through an ac circuit breaker and an isolation switch, respectively. The single sub-module of the DPFC comprises an energy-obtaining current transformer, a bypass switch KM, a bidirectional conduction thyristor TBS and a full-bridge module, wherein the energy-obtaining current transformer is connected with the full-bridge module in series, and the bypass switch KM, the bidirectional conduction thyristor TBS and the full-bridge module are connected in parallel. The bypass switch KM and the bidirectional conduction thyristor TBS are mainly used for switching in and out of the sub-modules, and play a role in protecting the full-bridge module when a fault occurs.
In fig. 1, Ubus1 and 2 are PTs of the first bus and the second bus of the left-side substation, and TV1 and TV2 are PTs of the first bus and the second bus of the right-side substation.
W1.ds41, w1.ds42, w1.qf1 are ac breakers and disconnectors with first lines connected to the left side substation bus.
W2.ds41, w2.ds42, w2.qf1 are ac breakers and disconnecting switches with second lines connected to the left side substation bus.
W1.DS1, W1.DS2, W1.DS3, W1.QF, W1.DS21 and W1.DS31 are public area switches and switches of the first DPFC, and for application scenes with long sub-module distribution distances, the switch switches can be omitted.
W2.DS1, W2.DS2, W2.DS3, W2.QF, W2.DS21 and W2.DS31 are common area switches and switches of the second DPFC, and for application scenes with long sub-module distribution distances, the switch switches can be omitted.
MOV is arrester, BPS is bidirectional conduction thyristor.
KM1 and KM2 are bypass switches of the submodules.
C1# -C9# indicates the capacitance number corresponding to 9 sub-modules.
Example 1
The embodiment provides a control method of a distributed power flow controller under a low-current working condition, which comprises the following steps:
1) the control of low current occurs in the start-up phase, and the control flow chart is shown in fig. 2.
When the DPFC is in a starting stage, the converter valve is not unlocked, and when the effective value of the current flowing through the DPFC is judged to be more than the minimum limit value for more than 1 minute, the current is considered to be stabilized above the minimum limit value, the condition of reliable energy taking is met, the converter valve is allowed to be unlocked, and the converter valve is operated to unlock; if the current is lower than the minimum limit value in the phase, the timing is started again for more than 1 minute after the current is higher than the minimum limit value next time, and if the current is always stable above the minimum limit value, the converter valve is allowed to be unlocked.
2) The control of low current occurs after steady state operation, and the control flow chart is shown in fig. 3.
When the DPFC is in steady-state operation, if the output voltage of the DPFC is smaller than the rated value and the effective value of the current flowing through the DPFC is lower than the minimum limit value, firstly, the DPFC is adjusted to present a capacitive impedance state, then the output voltage of the DPFC is adjusted to enable the line current to be always larger than the minimum limit value plus Delta I, the unit of the Delta I is A, and the value range is 20-100A.
If the DPFC outputs capacitive impedance and the output voltage is equal to the rated value of the DPFC, the line current is still the lowest limit value, the low-current protection action of the DPFC is triggered, the converter valve is locked, and the DPFC is bypassed. And when the line current is recovered to be above the minimum value plus Delta I for t seconds, the control protection system of the DPFC considers that the sub-module of the DPFC can normally obtain energy, and the sub-module is put into the DPFC again to unlock. The value of t is determined by the line current value after the steady state is recovered, and the larger the line current value is, the shorter t is. the value range of t is 1s to 5 min.
Example 2
This embodiment provides a control system under distributed power flow controller low current operating mode, and it includes:
1) control module with low current in starting stage
When the DPFC is in a starting stage, the converter valve is not unlocked, and when the effective value of the current flowing through the DPFC is judged to be more than the minimum limit value for more than 1 minute, the current is considered to be stabilized above the minimum limit value, the condition of reliable energy taking is met, the converter valve is allowed to be unlocked, and the converter valve is operated to unlock; if the current is lower than the minimum limit value in the phase, the timing is started again for more than 1 minute after the current is higher than the minimum limit value next time, and if the current is always stable above the minimum limit value, the converter valve is allowed to be unlocked.
2) Control module for low current after steady state operation
When the DPFC is in steady-state operation, if the output voltage of the DPFC is smaller than the rated value and the effective value of the current flowing through the DPFC is lower than the minimum limit value, firstly, the DPFC is adjusted to present a capacitive impedance state, then the output voltage of the DPFC is adjusted to enable the line current to be always larger than the minimum limit value plus Delta I, the unit of the Delta I is A, and the value range is 20-100A.
If the DPFC outputs capacitive impedance and the output voltage is equal to the rated value of the DPFC, the line current is still the lowest limit value, the low-current protection action of the DPFC is triggered, the converter valve is locked, and the DPFC is bypassed. And when the line current is recovered to be above the minimum value plus Delta I for t seconds, the control protection system of the DPFC considers that the sub-module of the DPFC can normally obtain energy, and the sub-module is put into the DPFC again to unlock. The value of t is determined by the line current value after the steady state is recovered, and the larger the line current value is, the shorter t is. the value range of t is 1s to 5 min.
The above embodiments are merely preferred embodiments of the present invention. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention fall within the scope of the present invention.
Claims (8)
1. The utility model provides a control method under distributed power flow controller low current operating mode, distributed power flow controller contain multistage submodule piece and public switch knife switch region, first circuit series connection first DPFC, second circuit series connection second DPFC, first circuit and second circuit are connected to first interchange generating line and second interchange generating line through exchanging circuit breaker and isolation knife switch respectively, DPFC's single submodule piece is including getting ability current transformer, bypass switch KM, two-way conduction thyristor TBS and full-bridge module, get ability current transformer and full-bridge module series connection, bypass switch KM, two-way conduction thyristor TBS and full-bridge module are parallelly connected, its characterized in that, control method include:
1) control of low current during start-up
When the DPFC is in a starting stage, the converter valve is not unlocked, and when the effective value of the current flowing through the DPFC is judged to be more than the minimum limit value for more than 1 minute, the current is considered to be stabilized above the minimum limit value, the condition of reliable energy taking is met, the converter valve is allowed to be unlocked, and the converter valve is operated to unlock; if the current is lower than the minimum limit value, restarting timing for more than 1 minute after the current is higher than the minimum limit value next time, and if the current is always stable above the minimum limit value, allowing the converter valve to be unlocked;
2) control of low current after steady state operation
When the DPFC is in steady-state operation, if the output voltage of the DPFC is smaller than the rated value and the effective value of the current flowing through the DPFC is lower than the minimum limit value, firstly, the DPFC is adjusted to present a capacitive impedance state, then the output voltage of the DPFC is adjusted to enable the line current to be always larger than the minimum limit value plus Delta I, and the unit of the Delta I is A;
if the DPFC outputs capacitive impedance and the output voltage is equal to the rated value of the DPFC, the line current is still the lowest limit value, the low-current protection action of the DPFC is triggered, the converter valve is locked, and the DPFC is bypassed; after the DPFC is bypassed, when the line current is recovered to be above the minimum value plus delta I for t seconds, the control protection system of the DPFC considers that the sub-module of the DPFC can normally obtain energy, and the DPFC is put into unlocking operation again.
2. The control method of the distributed power flow controller under the low-current working condition according to claim 1, wherein the value range of Δ I is 20-100A.
3. The control method of claim 1, wherein in the control of low current after steady state operation, the value of t is determined by the line current value after steady state recovery, and the larger the line current value is, the shorter t is.
4. The control method of the distributed power flow controller under the low-current working condition according to claim 3, wherein the value range of t is 1s to 5 min.
5. The utility model provides a control system under distributed power flow controller low current operating mode, distributed power flow controller contain multistage submodule piece and public switch knife switch region, first DPFC is established ties to first circuit, second DPFC is established ties to the second circuit, first circuit and second circuit are connected to first alternating current generating line and second alternating current generating line through exchanging circuit breaker and isolation knife switch respectively, DPFC's single submodule piece including getting can current transformer, bypass switch KM, two-way conduction thyristor TBS and full-bridge module, get can current transformer and full-bridge module and establish ties, bypass switch KM, two-way conduction thyristor TBS and full-bridge module are parallelly connected, its characterized in that, control system include:
1) control module with low current in starting stage
When the DPFC is in a starting stage, the converter valve is not unlocked, and when the effective value of the current flowing through the DPFC is judged to be more than the minimum limit value for more than 1 minute, the current is considered to be stabilized above the minimum limit value, the condition of reliable energy taking is met, the converter valve is allowed to be unlocked, and the converter valve is operated to unlock; if the current is lower than the minimum limit value, restarting timing for more than 1 minute after the current is higher than the minimum limit value next time, and if the current is always stable above the minimum limit value, allowing the converter valve to be unlocked;
2) control module for low current after steady state operation
When the DPFC is in steady-state operation, if the output voltage of the DPFC is smaller than the rated value and the effective value of the current flowing through the DPFC is lower than the minimum limit value, firstly, the DPFC is adjusted to present a capacitive impedance state, then the output voltage of the DPFC is adjusted to enable the line current to be always larger than the minimum limit value plus Delta I, and the unit of the Delta I is A;
if the DPFC outputs capacitive impedance and the output voltage is equal to the rated value of the DPFC, the line current is still the lowest limit value, the low-current protection action of the DPFC is triggered, the converter valve is locked, and the DPFC is bypassed; after the DPFC is bypassed, when the line current is recovered to be above the minimum value plus delta I for t seconds, the control protection system of the DPFC considers that the sub-module of the DPFC can normally obtain energy, and the DPFC is put into unlocking operation again.
6. The control system of claim 5, wherein Δ I ranges from 20A to 100A.
7. The control system of claim 5, wherein the power flow controller is further configured to control the power flow in the low-current condition,
in the control of low current after steady state operation, the value of t is determined by the line current value after steady state recovery, and the larger the line current value is, the shorter t is.
8. The control system of claim 7, wherein t is in a range of 1s to 5 min.
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