CN114123358B - Reactive power compensation device, method and system for power flow control device - Google Patents
Reactive power compensation device, method and system for power flow control device Download PDFInfo
- Publication number
- CN114123358B CN114123358B CN202111330082.2A CN202111330082A CN114123358B CN 114123358 B CN114123358 B CN 114123358B CN 202111330082 A CN202111330082 A CN 202111330082A CN 114123358 B CN114123358 B CN 114123358B
- Authority
- CN
- China
- Prior art keywords
- synchronous motor
- reactive power
- voltage
- exciting current
- magnitude
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001360 synchronised effect Effects 0.000 claims abstract description 200
- 230000005284 excitation Effects 0.000 claims description 18
- 230000004044 response Effects 0.000 claims description 16
- 238000010521 absorption reaction Methods 0.000 claims description 11
- 230000015654 memory Effects 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 12
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
-
- 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- 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
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
-
- 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]
-
- 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
- Y02E40/30—Reactive power compensation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a reactive power compensation device, a reactive power compensation method and a reactive power compensation system for a power flow control device, wherein the device comprises a synchronous motor M, a synchronous motor G, a series transformer and a parallel transformer, wherein when one of the synchronous motor M and the synchronous motor G is a generator, the other is a motor; the synchronous motor M is connected with the low-voltage side of a parallel transformer, the high-voltage side of the parallel transformer is connected with a high-voltage line in parallel, and the synchronous motor G is connected with the high-voltage line in series through a series transformer. The device comprises two stages of synchronous motors, wherein the synchronous motors M at the parallel side are used for absorbing and generating reactive power, short-circuit capacity support and voltage support are provided for a power grid, the voltage stability of a system voltage and a new energy grid-connected point is maintained, the voltage with adjustable amplitude is output through the synchronous motor G and a series transformer, the equivalent impedance of a circuit is changed, and the tide control is realized.
Description
Technical Field
The invention relates to a reactive power compensation device, method and system for a power flow control device, and belongs to the technical field of power system stability and control.
Background
Modern power systems are gradually moving towards high proportions of renewable energy and high proportions of power electronics. In the background of double high, a novel power flow control device for a power grid is generated under the conditions that a large number of newly increased loads are generated, the power transmission capacity of existing lines is limited, and a plurality of lines are erected on a large scale and lack of enough space or economy. The current power flow control devices are mostly power electronic devices, such as Unified Power Flow Controllers (UPFC) of the latest generation FACTS devices, and the special topology structure of the current flow control devices makes internal fault currents of the current flow control devices easy to spread. In addition, the access of a large number of power electronics not only has a significant impact on classical stability, but also can cause novel stability problems such as sub-supersynchronous control interactions, harmonic resonances, and the like. Under the background, the research and development and application of the power flow control device with the inertia have great development prospect.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a reactive power compensation device, a reactive power compensation method and a reactive power compensation system for a power flow control device, which solve the problems disclosed in the background art.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
In a first aspect, the present invention provides a reactive power compensation device for a power flow control device, comprising: the synchronous motor M and the synchronous motor G are connected in series, and one of the synchronous motor M and the synchronous motor G is a generator, and the other synchronous motor G is a motor; the synchronous motor M is connected with the low-voltage side of the parallel transformer, the high-voltage side of the parallel transformer is connected with the high-voltage line in parallel, and the synchronous motor G connects the voltage in series into the high-voltage line through the series transformer.
Furthermore, the synchronous motor M and the synchronous motor G are coaxial synchronous motors with two magnetic field windings differing by 90 electrical degrees, and the synchronous motor M can provide necessary mechanical power to drive the rotor of the synchronous motor G to rotate when being used as a motor, and the synchronous motor G is a generator at the moment.
Further, the capacity of the synchronous motor G is equal to the capacity of the synchronous motor M.
Furthermore, the synchronous motor G and the synchronous motor M can send or absorb reactive power to the system in a mode of adjusting excitation.
Furthermore, the synchronous motor M can smoothly control the emission and absorption of the parallel side reactive power Q M in a certain range by adjusting the excitation mode, and the reactive power emitted when the excitation current is increased is obviously increased; conversely, the reactive power emitted when the excitation current is reduced is significantly reduced.
Further, the synchronous motor M has a boundary value I fb of exciting current, and when the passing exciting current is smaller than I fb, the synchronous motor M absorbs reactive power; when the passing exciting current is larger than I fb, the synchronous motor M emits reactive power.
In a second aspect, the present invention provides a control method of a reactive power compensation device for a power flow control device according to the above, comprising:
Responding to the reactive power of the access point at the parallel side to be increased, and sending a reactive power instruction to the synchronous motor M;
And in response to the excess condition of the reactive power of the access point on the parallel side due to line overvoltage caused by excessive line compensation or high-voltage line empty/light load, sending a command for absorbing the reactive power to the synchronous motor M.
In a third aspect, the present invention provides a control system of a reactive power compensation device for a power flow control device according to the above, comprising:
excitation current control module of synchronous machine M: and in response to the reactive power of the access point at the parallel side needing to be increased, sending a reactive power instruction to the synchronous motor M, and in response to the reactive power of the access point at the parallel side generating an excess condition, sending a reactive power absorption instruction to the synchronous motor M.
In a fourth aspect, the invention provides a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a method according to the above.
In a fifth aspect, the present invention provides a computing device, comprising,
One or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing a method according to the above.
Compared with the prior art, the invention has the beneficial effects that:
the invention comprises a two-stage synchronous motor, has fault isolation capability and harmonic suppression capability, and provides short-circuit capacity support and voltage support for a power grid through the capability of absorbing and generating reactive power of the synchronous motor M, and absorbs excessive reactive power to prevent overvoltage hazard and maintain stable system voltage.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention;
Fig. 2 is a diagram of the running state phasors of the synchronous machine M when absorbing reactive power;
Fig. 3 is a diagram of the running state phasors of the synchronous machine M when it is generating reactive power.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
Example 1
The present embodiment introduces a reactive power compensation device for a power flow control device, including: the synchronous motor comprises a synchronous motor M, a synchronous motor G, a parallel transformer and a series transformer, wherein when one of the synchronous motor M and the synchronous motor G is a generator, the other is a motor; the synchronous motor M is connected with the low-voltage side of a parallel transformer, and the high-voltage side of the parallel transformer is connected with the high-voltage line in parallel; the synchronous motor G is connected with the primary side of a series transformer, and the secondary side of the series transformer is connected in series with a high-voltage circuit.
The synchronous motor M and the synchronous motor G are coaxial synchronous motors with the phase difference of 90 electrical angles between two magnetic field windings, and the magnetic field windings of the synchronous motor M designed by the device lead the magnetic field windings of the synchronous motor G by 90 electrical angles.
The capacity of the synchronous motor G is equal to that of the synchronous motor M; the capacity of the synchronous motor M is determined according to reactive compensation capacity required by a transformer substation, moment of inertia required by a power grid and short circuit capacity, and is generally about 5-30% of the capacity of the transformer substation.
The parallel transformer capacity should be the same as the synchronous motor M capacity.
Since the synchronous motor M is required to act not only on the dragging synchronous motor G for rotation but also on the absorption or emission of reactive power to provide voltage support, it is necessary to provide an excitation power supply capable of quick response.
Referring to fig. 1, the tide control apparatus structure includes a synchronous motor M, a synchronous motor G, a parallel transformer and a series transformer. The capacity of the synchronous motor M is about 5-30% of the capacity of the transformer station, and the synchronous motor M is connected to the low-voltage side of the parallel side transformer. The capacity of the synchronous motor G is equal to that of the synchronous motor M, and the synchronous motor G is designed according to engineering actual requirements. The capacity of the series transformer ST is slightly larger than the capacity of the generator. The variation range of the exciting current is designed to be 0 < I f＜5Ifb.
Example 2
The method for controlling a reactive power compensation device for a power flow control device according to embodiment 1 provided in this embodiment specifically includes the following steps:
1) In response to a need to increase the reactive power of the parallel side access point, a reactive power command is sent to the synchronous motor M to rapidly increase the exciting current of the synchronous motor M, so that the amplitude of the electromotive force E M of the synchronous motor M is greater than the amplitude of the motor port voltage U M, and sufficient reactive power compensation can be provided for the system.
2) And in response to the excess condition of the reactive power of the access point on the parallel side due to the line overvoltage caused by the over compensation of the line or the air/light load of the high-voltage line, sending a command of absorbing the reactive power to the synchronous motor M. The exciting current of the synchronous motor M is rapidly reduced, so that the amplitude of the electromotive force E M of the synchronous motor M is smaller than the amplitude of the motor port voltage U M, the synchronous motor M can consume excessive reactive power, and the system voltage is ensured to be stable.
The state of the synchronous motor M for absorbing/emitting reactive power and the magnitude of the reactive power are controlled by adjusting the exciting current of the synchronous motor M. When the reactive power of the system is lost and reactive compensation is needed, the synchronous motor M receives a reactive compensation instruction, the excitation module rapidly responds to increase the excitation current, when the excitation current I f is larger than I fb, the amplitude of the electromotive force E M of the synchronous motor is larger than the amplitude of the port voltage U M of the synchronous motor, the synchronous motor M starts to send out reactive power outwards, namely Q M is larger than 0, and the value of I f is continuously increased until the system voltage is stable. When the system is in reactive excess, the system is easy to generate overvoltage hazard, when the system needs to consume excessive reactive power, the synchronous motor M receives a reactive power absorption instruction, the excitation module responds rapidly to reduce the excitation current, when the excitation current I f is smaller than I fb, the amplitude of the electromotive force E M of the synchronous motor is smaller than the amplitude of the port voltage U M of the synchronous motor, the synchronous motor M starts to absorb reactive power from the outside, namely Q M is smaller than 0, and the value of I f can absorb more reactive power after being continuously reduced.
The amplitude of exciting current of the synchronous motor M is regulated to be in millisecond-level rapid control, and is generally in a voltage closed loop, and can be in a reactive closed loop as a slow outer loop, and the voltage closed loop is still in the interior, so that no matter in the voltage closed loop or the reactive closed loop, a given value can be issued by dispatching, and self-decision can be made according to off-line calculation, so that the requirement of a power grid on voltage/reactive rapid response is met.
Referring to fig. 2, a side view of a current flow direction of the synchronous motor M is taken as a positive direction, and a phasor diagram of an operation state of the synchronous motor M is made, wherein E M is an electromotive force of the synchronous motor M, and E M is directly controlled by exciting current I f; u M is the port voltage of the synchronous motor and is mainly determined by the voltage of a power grid; i M is the current flowing out of the synchronous motor; because most of large synchronous motors for reactive compensation adopt non-salient pole synchronous motors, X S is the internal impedance of the synchronous motor and is the sum of armature reactance and leakage reactance. Since synchronous motor M needs to provide a certain mechanical torque to synchronous motor G so that the rotor speed of synchronous motor G remains constant, U M needs to run ahead of E M, δ being the angle between U M and E M. Since the device needs to ensure stable operation of the synchronous motor G, a certain mechanical power needs to be transmitted through a shaft between M and G, and P M is defined as the mechanical power provided by the synchronous motor M to the synchronous motor G, so that the synchronous motor M externally appears to absorb active power from a power grid, P M is more than 0, and then the absolute value of a power factor angle phi between U M and I M is generally larger than 90 degrees. Since FIG. 2 shows that the absorption is reactive, Q M < 0, -180 DEG < phi < -90 DEG, the amplitude and phase change of U M are not large in normal operation, the amplitude of E M is smaller than that of U M, and when the amplitude change of E M is large, delta can be slightly increased or reduced correspondingly to ensure sufficient mechanical power P M.
Referring to fig. 3, a side view of a current flow direction of the synchronous motor M is taken as a positive direction, and a phasor diagram of an operation state of the synchronous motor M is made, wherein E M is an electromotive force of the synchronous motor M, and E M is directly controlled by exciting current I f; u M is the port voltage of the synchronous motor and is mainly determined by the voltage of a power grid; i M is the current flowing out of the synchronous motor; because most of large synchronous motors for reactive compensation adopt non-salient pole synchronous motors, X S is the internal impedance of the synchronous motor and the sum of the armature reactance and the leakage impedance. Since synchronous motor M needs to provide a certain mechanical torque to synchronous motor G so that the rotor speed of synchronous motor G remains constant, U M needs to run ahead of E M, δ being the angle between U M and E M. Since the device needs to ensure stable operation of the synchronous motor G, a certain mechanical power needs to be transmitted through a shaft between M and G, and P M is defined as the mechanical power provided by the synchronous motor M to the synchronous motor G, so that the synchronous motor M externally appears to absorb active power from a power grid, P M is more than 0, and then the absolute value of a power factor angle phi between U M and I M is generally larger than 90 degrees. Since fig. 3 shows that the synchronous motor M emits reactive power, Q M > 0, i.e., an operational state phasor diagram when the parallel compensation function is performed. Since P M＞0,UM still needs to run ahead E M, the motor electromotive force E M is greater in magnitude than motor port voltage U M, and synchronous motor M current I M lags U M by 90 < Φ < 180.
Example 3
The present embodiment provides a control system for a reactive power compensation device of a power flow control device according to embodiment 1, including:
Excitation current control module of synchronous machine M: and in response to the need of increasing the reactive power of the access point at the parallel side, sending a reactive power instruction to the synchronous motor M, and rapidly increasing the exciting current of the synchronous motor M. And in response to the excessive reactive power of the access points at the parallel side, sending a reactive power absorption instruction to the synchronous motor M, and rapidly reducing the exciting current of the synchronous motor M.
The invention comprises a two-stage synchronous motor, has fault isolation capability and harmonic suppression capability, and provides short-circuit capacity support and voltage support for a power grid through the capability of absorbing and generating reactive power of the synchronous motor M, and absorbs excessive reactive power to prevent overvoltage hazard and maintain stable system voltage.
Example 4
The present embodiment provides a computer-readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a control method of a power flow control apparatus.
Example 5
The present embodiment provides a computing device including one or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs including instructions for performing a control method of a power flow control apparatus.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (10)
1. A reactive power compensation device for a power flow control device, comprising: the synchronous motor M and the synchronous motor G are connected in series, and one of the synchronous motor M and the synchronous motor G is a generator, and the other synchronous motor G is a motor; the synchronous motor M is connected with the low-voltage side of a parallel transformer, the high-voltage side of the parallel transformer is connected with a high-voltage line in parallel, and the synchronous motor G connects voltage in series into the high-voltage line through a series transformer;
the method comprises the steps of responding to the reactive power of an access point at the parallel side to be increased, sending a reactive power instruction to a synchronous motor M, and rapidly increasing exciting current of the synchronous motor M to enable the amplitude of electromotive force E M of the synchronous motor M to be larger than that of a motor port voltage U M;
In response to the line overvoltage caused by the line overcompensation or the high-voltage line air/light load on the parallel side, the reactive power of the access point is in excess, and a command for absorbing the reactive power is sent to the synchronous motor M, so that the exciting current of the synchronous motor M is rapidly reduced, the amplitude of the electromotive force E M of the synchronous motor M is smaller than the amplitude of the motor port voltage U M, and the synchronous motor M can consume the excess reactive power;
The state of absorbing/emitting reactive power and the magnitude of absorbing/emitting reactive power of the synchronous motor M are controlled by adjusting the magnitude of exciting current of the synchronous motor M, when reactive power of a system is lost and reactive power compensation is needed, the synchronous motor M receives a reactive power compensation instruction, the exciting module rapidly responds to increase exciting current, when exciting current I f is larger than I fb, the magnitude of electromotive force E M of the synchronous motor is larger than the magnitude of port voltage U M of the synchronous motor, the synchronous motor M starts to emit reactive power outwards, Q M is larger than 0, the value of I f is continuously increased until the system voltage is stable, when reactive power of the system is excessive, overvoltage hazard easily occurs to the system, the synchronous motor M receives a reactive power absorption instruction, the exciting module rapidly responds to reduce exciting current, when exciting current I f is smaller than I fb, the magnitude of electromotive force E M of the synchronous motor is smaller than the magnitude of port voltage U M of the synchronous motor, the synchronous motor M starts to absorb reactive power from the outside, Q M is smaller than 0, the value of I f is continuously reduced, and more reactive power is absorbed;
the exciting current amplitude of the synchronous motor M is regulated to be in millisecond-level rapid control, and is a voltage closed loop, or a reactive closed loop is used as a slow outer loop, and the voltage closed loop is still arranged inside the reactive closed loop.
2. A reactive power compensation device for a power flow control device according to claim 1, characterized in that: the synchronous motor M and the synchronous motor G are coaxial synchronous motors with the phase difference of 90 electric angles between two magnetic field windings, and the synchronous motor M can provide necessary mechanical power to drive the rotor of the synchronous motor G to rotate when being used as a motor, and the synchronous motor G is a generator.
3. A reactive power compensation device for a power flow control device according to claim 1, characterized in that: the capacity of the synchronous motor G is equal to the capacity of the synchronous motor M.
4. A reactive power compensation device for a power flow control device according to claim 1, characterized in that: the synchronous motor G and the synchronous motor M can send or absorb reactive power to the system in a mode of adjusting excitation.
5. A reactive power compensation device for a power flow control device according to claim 1, characterized in that: the synchronous motor M can smoothly control the emission and absorption of the parallel side reactive power Q M in a certain range by adjusting the excitation mode, and the reactive power emitted when the excitation current is increased is obviously increased; conversely, the reactive power emitted when the excitation current is reduced is significantly reduced.
6. A reactive power compensation device for a power flow control device according to claim 1, characterized in that: the synchronous motor M has a boundary value I fb of exciting current, and absorbs reactive power when the passing exciting current is smaller than I fb; when the passing exciting current is larger than I fb, the synchronous motor M emits reactive power.
7. A control method of a reactive power compensation device for a power flow control device according to claim 1, characterized by comprising:
Responding to the reactive power of the access point at the parallel side to be increased, and sending a reactive power instruction to the synchronous motor M;
Responding to the excess condition of reactive power of an access point on the parallel side due to line overvoltage caused by excessive line compensation or high-voltage line empty/light load, and sending a command of absorbing the reactive power to the synchronous motor M;
The method comprises the following steps: in response to the need of increasing the reactive power of the parallel side access point, sending a reactive power instruction to the synchronous motor M, and rapidly increasing the exciting current of the synchronous motor M to enable the amplitude of the electromotive force E M of the synchronous motor M to be larger than the amplitude of the motor port voltage U M;
In response to the line overvoltage caused by the line overcompensation or the high-voltage line air/light load on the parallel side, the reactive power of the access point is in excess, and a command for absorbing the reactive power is sent to the synchronous motor M, so that the exciting current of the synchronous motor M is rapidly reduced, the amplitude of the electromotive force E M of the synchronous motor M is smaller than the amplitude of the motor port voltage U M, and the synchronous motor M can consume the excess reactive power;
The state of absorbing/emitting reactive power and the magnitude of absorbing/emitting reactive power of the synchronous motor M are controlled by adjusting the magnitude of exciting current of the synchronous motor M, when reactive power of a system is lost and reactive power compensation is needed, the synchronous motor M receives a reactive power compensation instruction, the exciting module rapidly responds to increase exciting current, when exciting current I f is larger than I fb, the magnitude of electromotive force E M of the synchronous motor is larger than the magnitude of port voltage U M of the synchronous motor, the synchronous motor M starts to emit reactive power outwards, Q M is larger than 0, the value of I f is continuously increased until the system voltage is stable, when reactive power of the system is excessive, overvoltage hazard easily occurs to the system, the synchronous motor M receives a reactive power absorption instruction, the exciting module rapidly responds to reduce exciting current, when exciting current I f is smaller than I fb, the magnitude of electromotive force E M of the synchronous motor is smaller than the magnitude of port voltage U M of the synchronous motor, the synchronous motor M starts to absorb reactive power from the outside, Q M is smaller than 0, the value of I f is continuously reduced, and more reactive power is absorbed;
the exciting current amplitude of the synchronous motor M is regulated to be in millisecond-level rapid control, and is a voltage closed loop, or a reactive closed loop is used as a slow outer loop, and the voltage closed loop is still arranged inside the reactive closed loop.
8. A control system of a reactive power compensation device for a power flow control device according to claim 1, characterized by comprising:
Excitation current control module of synchronous machine M: in response to the need of increasing the reactive power of the access point at the parallel side, sending a reactive power instruction to the synchronous motor M, and in response to the occurrence of excess reactive power of the access point at the parallel side, sending a reactive power absorption instruction to the synchronous motor M, specifically: in response to the need of increasing the reactive power of the parallel side access point, sending a reactive power instruction to the synchronous motor M, and rapidly increasing the exciting current of the synchronous motor M to enable the amplitude of the electromotive force E M of the synchronous motor M to be larger than the amplitude of the motor port voltage U M;
In response to the line overvoltage caused by the line overcompensation or the high-voltage line air/light load on the parallel side, the reactive power of the access point is in excess, and a command for absorbing the reactive power is sent to the synchronous motor M, so that the exciting current of the synchronous motor M is rapidly reduced, the amplitude of the electromotive force E M of the synchronous motor M is smaller than the amplitude of the motor port voltage U M, and the synchronous motor M can consume the excess reactive power;
The state of absorbing/emitting reactive power and the magnitude of absorbing/emitting reactive power of the synchronous motor M are controlled by adjusting the magnitude of exciting current of the synchronous motor M, when reactive power of a system is lost and reactive power compensation is needed, the synchronous motor M receives a reactive power compensation instruction, the exciting module rapidly responds to increase exciting current, when exciting current I f is larger than I fb, the magnitude of electromotive force E M of the synchronous motor is larger than the magnitude of port voltage U M of the synchronous motor, the synchronous motor M starts to emit reactive power outwards, Q M is larger than 0, the value of I f is continuously increased until the system voltage is stable, when reactive power of the system is excessive, overvoltage hazard easily occurs to the system, the synchronous motor M receives a reactive power absorption instruction, the exciting module rapidly responds to reduce exciting current, when exciting current I f is smaller than I fb, the magnitude of electromotive force E M of the synchronous motor is smaller than the magnitude of port voltage U M of the synchronous motor, the synchronous motor M starts to absorb reactive power from the outside, Q M is smaller than 0, the value of I f is continuously reduced, and more reactive power is absorbed;
the exciting current amplitude of the synchronous motor M is regulated to be in millisecond-level rapid control, and is a voltage closed loop, or a reactive closed loop is used as a slow outer loop, and the voltage closed loop is still arranged inside the reactive closed loop.
9. A computer readable storage medium storing one or more programs, characterized by: the one or more programs include instructions, which when executed by a computing device, cause the computing device to perform the method of claim 7.
10. A computing device, characterized by: comprising the steps of (a) a step of,
One or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing the method of claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111330082.2A CN114123358B (en) | 2021-11-11 | 2021-11-11 | Reactive power compensation device, method and system for power flow control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111330082.2A CN114123358B (en) | 2021-11-11 | 2021-11-11 | Reactive power compensation device, method and system for power flow control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114123358A CN114123358A (en) | 2022-03-01 |
| CN114123358B true CN114123358B (en) | 2024-06-11 |
Family
ID=80378254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111330082.2A Active CN114123358B (en) | 2021-11-11 | 2021-11-11 | Reactive power compensation device, method and system for power flow control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114123358B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB629586A (en) * | 1943-07-01 | 1949-09-23 | British Thomson Houston Co Ltd | Improvements in and relating to wattless current regulating systems for a.c. circuits |
| WO2009101234A1 (en) * | 2008-02-15 | 2009-08-20 | Wind To Power System, S.L. | Series voltage compensator and method for series voltage compensation in electrical generators |
| CN103838234A (en) * | 2014-03-24 | 2014-06-04 | 国家电网公司 | Generator wide area damping control system closed-loop testing method based on ADPSS |
| CN112909953A (en) * | 2021-03-22 | 2021-06-04 | 南瑞集团有限公司 | Power flow control device, method and system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9331482B2 (en) * | 2012-11-02 | 2016-05-03 | North Carolina State University | Static synchronous compensator systems and related methods |
-
2021
- 2021-11-11 CN CN202111330082.2A patent/CN114123358B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB629586A (en) * | 1943-07-01 | 1949-09-23 | British Thomson Houston Co Ltd | Improvements in and relating to wattless current regulating systems for a.c. circuits |
| WO2009101234A1 (en) * | 2008-02-15 | 2009-08-20 | Wind To Power System, S.L. | Series voltage compensator and method for series voltage compensation in electrical generators |
| CN103838234A (en) * | 2014-03-24 | 2014-06-04 | 国家电网公司 | Generator wide area damping control system closed-loop testing method based on ADPSS |
| CN112909953A (en) * | 2021-03-22 | 2021-06-04 | 南瑞集团有限公司 | Power flow control device, method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114123358A (en) | 2022-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105244911A (en) | High permeability new energy power grid connection system and stability control method | |
| CN101871433B (en) | Variable-speed constant-frequency wind power generation device having energy storing device | |
| Xie et al. | Enhancing HVRT capability of DFIG-based wind farms using cooperative rotor-side SMES considering the blocking fault of LCC-HVDC system | |
| Zhang et al. | Hierarchical coordinated control of DC microgrid with wind turbines | |
| CN108429251A (en) | A kind of fault ride-through of power grid control method | |
| Anju et al. | Co-ordination of SMES with STATCOM for mitigating SSR and damping power system oscillations in a series compensated wind power system | |
| CN112003332A (en) | Inertia-expandable phase modulator flywheel system and using method thereof | |
| Huang et al. | Cooperative strategy of SMES device and modified control for cost-effective fault ride-through enhancement and power smoothing of 10 MW class superconducting wind turbine | |
| CN113675897A (en) | Active priority LVRT control method and GSC control method | |
| CN114123358B (en) | Reactive power compensation device, method and system for power flow control device | |
| Najaty Mazgar et al. | ESS equipped DFIG wind farm with coordinated power control under grid fault conditions | |
| Song et al. | High voltage ride-through control method for DFIG-based wind turbines based on Resonant Controller | |
| Ngom et al. | An improved control for DC-link fluctuation during voltage dip based on DFIG | |
| Imai et al. | A novel virtual synchronous generator control of PMSG-based wind generation system to enhance transient stability of power system | |
| CN113595094A (en) | Double-fed fan high voltage ride through control method | |
| Salles et al. | A study on the rotor side control of DFIG-based wind turbine during voltage sags without crowbar system | |
| CN112909953A (en) | Power flow control device, method and system | |
| Benlamoudi et al. | Autonomous SEIG in a small wind power plant with voltage and frequency control | |
| CN117081098B (en) | High-inertia high-power rapid frequency/voltage stabilizing device for new energy power system | |
| Li et al. | The Direct-drive Permanent Magnet Synchronous Generator Based on an Improved VSG-controlled High Voltage Ride-through Strategy | |
| Qu et al. | VSG-based PMSG multi-machine parallel with DC droop control strategy | |
| Qi et al. | Effect of DFIG under droop control on center migration of out-of-step oscillation | |
| Knight et al. | A cage rotor induction generator capable of supplying reactive power | |
| Roy et al. | STATCOM model for integration of wind turbine to grid | |
| CN111769569B (en) | Control method, device and system for phase modulator of extra-high voltage direct current transmitting end converter station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |