CN211151545U - Phase modulator excitation control system based on reactive and voltage double closed-loop control - Google Patents
Phase modulator excitation control system based on reactive and voltage double closed-loop control Download PDFInfo
- Publication number
- CN211151545U CN211151545U CN201921772359.5U CN201921772359U CN211151545U CN 211151545 U CN211151545 U CN 211151545U CN 201921772359 U CN201921772359 U CN 201921772359U CN 211151545 U CN211151545 U CN 211151545U
- Authority
- CN
- China
- Prior art keywords
- voltage
- comparator
- control
- phase modulator
- excitation
- 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
- 230000005284 excitation Effects 0.000 title claims abstract description 92
- 239000003381 stabilizer Substances 0.000 claims abstract description 13
- 238000013016 damping Methods 0.000 abstract description 10
- 230000001052 transient effect Effects 0.000 abstract description 9
- 230000010355 oscillation Effects 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000001360 synchronised effect Effects 0.000 description 16
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000004044 response Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000003607 modifier Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
Images
Classifications
-
- 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
- Control Of Eletrric Generators (AREA)
Abstract
The utility model provides a phase modulation machine excitation control system based on idle and voltage double closed-loop control has been provided, the problem that traditional phase modulation machine excitation control system is difficult to simultaneously deal with steady state idle control and transient state voltage control by voltage closed-loop control alone is solved, specifically be a control circuit structure, satisfy the excitation control of the idle and transient state voltage of system steady state simultaneously through the double closed-loop control system who sets up the inner and outer loop, add Power System Stabilizer (PSS) in addition on the basis of double closed-loop control, add control signal such as phase modulation machine frequency and rotational speed and excitation control logic and promote system damping, the purpose that has reached reduction system low frequency oscillation.
Description
Technical Field
The disclosure relates to the technical field related to motor excitation control, in particular to a phase modulator excitation control system based on reactive power and voltage double closed-loop control.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Synchronous phase modifier: the synchronous phase modifier is a synchronous motor in a special operation state, and when the synchronous phase modifier is applied to a power system, the synchronous phase modifier can automatically increase reactive output when the voltage of a power grid is reduced according to the requirement of the system, and absorb reactive power when the voltage of the power grid is increased so as to maintain the voltage, improve the stability of the power system and improve the power supply quality of the system.
Excitation regulator: the automatic excitation regulator is a device for automatically regulating the excitation of a synchronous generator, a synchronous phase modulator and a large synchronous motor in order to improve the steady-state and dynamic performances of a power system.
The large synchronous phase modulator has the capability of providing dynamic high-power reactive support and high-capacity bidirectional reactive power regulation for the extra-high voltage direct current power grid, and the power factor of the power grid can be regulated by regulating the excitation of the large synchronous phase modulator in engineering application. The excitation regulator is used as a phase modulator excitation system core control mechanism, and the control performance of the excitation regulator greatly influences the safe operation environment of a power grid.
In the past, a phase modulator excitation system adopts single voltage ring control, and when the voltage of a power grid fluctuates, the phase modulator can greatly adjust the reactive power of the system through the excitation system in order to maintain the voltage stability of the power grid, so that the system greatly loses the reserve capacity. The steady-state reactive power control and the transient voltage regulation are difficult to simultaneously deal with by the voltage closed-loop control, and an additional reactive power control outer ring is needed to realize the reactive power and voltage parallel control. Research proposes that reactive input and voltage input are connected in parallel, the control effect is improved, but the control structure and the calculation formula are complicated; the research also introduces power angle change deviation in a deviation equation, so that the closed-loop control performance of the excitation voltage is improved, but the damping coefficient and system parameters of the excitation voltage are difficult to determine in an actual system.
SUMMERY OF THE UTILITY MODEL
The utility model discloses in order to solve above-mentioned problem, a phase modulation machine excitation control system based on idle and voltage double closed-loop control has been provided, the problem that traditional phase modulation machine excitation control system is difficult to simultaneously deal with steady state idle control and transient state voltage control by voltage closed-loop control has been solved, specifically be a control circuit structure, satisfy the excitation control of the idle and transient state voltage of system steady state simultaneously through the double closed-loop control system who sets up the inner and outer ring, add Power System Stabilizer (PSS) in addition on the basis of double closed-loop control, add control signal such as phase modulation machine frequency and rotational speed excitation control logic and promote system damping, the purpose that has reached reduction system low frequency oscillation.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
one or more embodiments provide a phase modulator excitation control system based on reactive power and voltage double closed-loop control, which comprises a reactive power control outer loop and a voltage control inner loop, wherein the reactive power control outer loop comprises a first comparator and a PI operation module which are sequentially connected, and the voltage control inner loop comprises a second comparator and a PID operation module which are sequentially connected; the output end of the PI operation module is connected with the input end of the second comparator, the PI operation result of the reactive power control outer ring is input to the input end of the voltage control inner ring, and the output of the voltage control inner ring passes through the low excitation limiting device and the low excitation limiting device to obtain excitation voltage and output the excitation voltage to the phase modulator.
Further, the reactive power control outer ring and the voltage control inner ring are connected through a first amplitude limiter, and the first amplitude limiter limits the output of the PI operation result of the reactive power control outer ring within a certain range and inputs the output to the voltage control inner ring.
Further, the input of the first comparator may comprise a reactive power setpoint QrefAdditional control signal QregAnd actual value Q of reactive power of phase modulatormThe first comparator compares the reactive power set value QrefAnd an additional control signal QregAdding and subtracting the actual value Q of the reactive power of the phase modulatormObtaining an output of the first comparator; the output of the first comparator is used as the input of the PI operation module, and is input to the integral link and the proportional link of the PI operation module to respectively perform proportional-integral operation to obtain a PI operation result of the reactive power control outer loop.
Further, the following steps: the proportional parameter of the PI operation module is KQThe integral link parameter is
Wherein: t isQS is an operator in the complex frequency domain, being a time constant.
Further, the input of the second comparator further comprises a phase modulator terminal voltage set value UrefActual value U of terminal voltage of phase modulatorgThe second comparator compares the set value U of the phase modulator terminal voltagerefAnd the PI operation result of the reactive power control outer loop is subtracted, and then the actual value U of the terminal voltage of the phase modulator is subtractedgObtaining an output of the second comparator; the output of the second comparator is used as the input of the PID operation module, and the proportional link, the integral link and the differential link of the PID operation module are respectively input to carry out proportional, integral and differential operations and are superposed to obtain the result of the PID operation of the voltage control inner ring.
Further, the low-excitation limiting device is a minimum comparator, the over-excitation limiting device is a maximum comparator, and the minimum comparator and the maximum comparator are connected in series.
Further, the input of the minimum comparator is the result of the PID operation of the voltage control inner loop, and the value setting end of the minimum comparator sets the voltage minimum setting value of the minimum comparator;
the input of the maximum comparator is the output of the minimum comparator, and the value setting end of the maximum comparator sets the voltage maximum setting value of the maximum comparator.
Further, a second amplitude limiter and a third comparator can be sequentially connected behind the low excitation limiting device and the overdrive limiting device, the output of the low excitation limiting device and the output of the overdrive limiting device are limited within a set range by the second amplitude limiter, the input of the third comparator is the output of the second amplitude limiter and the commutation voltage drop, and the output of the third comparator is the difference value of the output of the second amplitude limiter at the input end and the commutation voltage drop.
Further, the system also comprises a power system stabilizer which is used for outputting an additional control signal Qreg。
Further, the input of the power system stabilizer is the actual value Q of the reactive power of the phase modulatormAny one or two signals of the rotating speed omega of the phase modulator and the working voltage/current frequency f of the phase modulator.
Compared with the prior art, the beneficial effect of this disclosure is:
the utility model discloses a phase modulation machine excitation control system based on idle and voltage double closed-loop control that this disclosure put forward is a control circuit structure specifically, satisfies the excitation control of the idle and transient state voltage of system steady state simultaneously through the double closed-loop control system who sets up the inner and outer loop, adds electric Power System Stabilizer (PSS) in addition on the basis of double closed-loop control, adds control signal such as phase modulation machine frequency and rotational speed and excites control logic and promotes system damping, has reached the purpose that reduces system low frequency oscillation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure.
FIG. 1 is a block diagram of a control system according to one or more embodiments;
fig. 2 is a diagram of a power system stabilizer PSS structure of an embodiment of the present disclosure;
fig. 3 is an effect diagram of the power system stabilizer PSS adopted in the embodiment of the present disclosure;
FIG. 4 is a comparison graph of voltage response curves at the phase modulator end of the operating system under the control structure of a single voltage closed loop and a double closed loop in the embodiment;
FIG. 5 is a comparison graph of the stator current response curves of the phase modulator of the operating system under the control structure of the single closed loop of the voltage and the double closed loop of the embodiment;
FIG. 6 is a comparison graph of excitation voltage response curves of a phase modulator of an operating system under a single voltage closed loop and a double closed loop control structure of the present embodiment;
FIG. 7 is a control schematic of an excitation regulator controlling phase modulator excitation;
wherein: 1. the device comprises a first comparator, a second comparator, a third comparator, a fourth comparator, a fifth comparator, a sixth comparator, a seventh comparator, a sixth comparator, a seventh comparator, a sixth comparator, a.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. The embodiments will be described in detail below with reference to the accompanying drawings.
In the technical solutions disclosed in one or more embodiments, as shown in fig. 1, a phase modulator excitation control system based on reactive power and voltage dual closed-loop control includes a reactive power control outer loop and a voltage control inner loop, where the reactive power control outer loop includes a first comparator and a PI operation module that are connected in sequence, and the voltage control inner loop includes a second comparator and a PID operation module that are connected in sequence; the output end of the PI operation module is connected with the input end of the second comparator, the PI operation result of the reactive power control outer ring is input to the input end of the voltage control inner ring, and the output of the voltage control inner ring passes through the low excitation limiting device and the low excitation limiting device to obtain excitation voltage and output the excitation voltage to the phase modulator.
The intermediate calculated quantity of the reactive power control outer ring is input into the voltage control inner ring to be superposed with the regulating quantity of the voltage control inner ring, and two factors of power and voltage are considered simultaneously to enable an output control signal to be more accurate, so that the method is favorable for accurately regulating the excitation of the phase modulator.
The reactive power control outer ring and the voltage control inner ring are connected through a first amplitude limiter 3, and the output of the reactive power control outer ring is limited within a certain range and is input into the voltage control inner ring. In this embodiment, the model of the first limiter 3 may be anitsu 1K 50A.
In some embodiments, the reactive power control outer loop comprises a first comparator 1 and a PI operation module 2 connected in sequence, and an input of the first comparator 1 may comprise a reactive power set value QrefAdditional control signal QregAnd actual value Q of reactive power of phase modulatormThe first comparator 1 sets the reactive power Q to the valuerefAnd an additional control signal QregAdding and subtracting the actual value Q of the reactive power of the phase modulatormThe output of the first comparator 1 is used as the input of the PI operation module 2, the integral link and the proportional link which are input to the PI operation module 2 are respectively subjected to proportional integral operation, and the operation results are added to obtain the PI operation result of the reactive power control outer ring, wherein the model of the first comparator 1 can be TI L M239D, PThe I operation module 2 can be a PI regulator OUMENS MSTCI-C.
In this embodiment, the proportional parameter that the PI operation module 2 can set is KQThe integral link parameter is
s is an operator in the complex frequency domain by adjusting the time constant TQAnd the coordination of the inner ring and the outer ring in a temporary stable state can be realized. In a steady state, a reactive outer ring plays a leading role, the reaction time is controlled to be in a level of 10s, in a transient state, the voltage inner ring realizes rapid strong excitation or strong demagnetization, and the control period is in a millisecond level. Time constant TQMay be set to 10 s.
In some embodiments, the voltage control inner loop comprises a second comparator 4 and a PID operation module 5 connected in sequence; the input of the second comparator 4 may also comprise a phase modulator terminal voltage setpoint UrefActual value U of terminal voltage of phase modulatorgThe second comparator 4 compares the phase modulator terminal voltage set value U with the phase modulator terminal voltage set valuerefAdding the output of the reactive power control outer loop, and subtracting the actual value U of the terminal voltage of the phase modulatorgThe output of the second comparator 4 is used as the input of the PID operation module 5, the proportional link, the integral link and the differential link of the input of the PID operation module 5 are respectively subjected to proportional, integral and differential operation and are superposed to obtain the result of voltage control inner loop PID operation, the model of the second comparator 4 can be TI L M239D, the PID operation module 5 can be a PID controller, and the model can be a PI regulator OUMEMSNS TCI-C.
K in PID operation module 5 in the present embodimentP,KI,KDThe inner loop PID parameter is voltage controlled.
In the embodiment, the reactive power control outer ring PI control with a large time constant is matched with the voltage control inner ring rapid PID control, so that respective control in different frequency domains can be realized, and mutual influence of the inner ring and the outer ring is avoided.
In some embodiments, the low excitation limiting device may be a minimum comparator 6 and the over-excitation limiting device may be a maximum comparator 7, the minimum comparator 6 and the maximum comparator 7 being connected in series.
In one implementation, the input of the minimum comparator 6 is the result of the PID operation in the inner loop of voltage control, and the value setting terminal of the minimum comparator 6 sets the minimum setting value of the voltage of the minimum comparator 6. The input of the maximum comparator 7 is the output of the minimum comparator, and the value setting terminal of the maximum comparator 7 sets the voltage maximum setting value of the maximum comparator 7.
The input of the minimum comparator 6 is the result of the voltage control inner loop PID operation, and the voltage minimum set value of the minimum comparator 6 is set. The minimum comparator 6 works on the principle that the output quantity is controlled according to the voltage minimum set value: when the input voltage value is greater than or equal to the voltage minimum set value, the input voltage can be directly output, and when the input voltage value of the minimum comparator 6 is less than the voltage minimum set value, the output can be the sum of the input voltage and the excitation voltage compensation value. Optionally, the minimum voltage setting value and the excitation voltage compensation value may be set by themselves, for example, the minimum voltage setting value may be 200V, and the excitation voltage compensation value may be 50V.
The input of the maximum comparator 7 is the output of the minimum comparator 6, the maximum voltage set value is set, and the working principle of the maximum comparator 7 is to control the output quantity according to the maximum set value: when the input voltage value of the maximum comparator 7 is less than or equal to the maximum voltage set value, the input voltage is directly output; when the input voltage value is larger than the minimum voltage set value, the output is the difference between the input voltage and the excitation voltage adjusting value. Optionally, the maximum voltage setting value and the excitation voltage adjustment value may be set by themselves, for example, the maximum voltage setting value may be 420V, and the excitation voltage adjustment value may be 50V.
As an implementation, the maximum comparator 7 is arranged before the minimum comparator 6, and the output of the maximum comparator 7 is used as the input of the minimum comparator 6.
In this embodiment, the model number of the minimum comparator 6 may be QORVO TG L2217, and the chip number of the maximum comparator 7 may be QORVO TG L2201.
In some embodiments, after the low excitation limiting device and the overdrive limiting device, a second limiter 8 and a third comparator 9 may be further provided, where the second limiter 8 limits the outputs of the low excitation limiting device and the overdrive limiting device within a set range, the input of the third comparator 9 is the output of the second limiter 8 and the commutation voltage drop, and the output of the third comparator 9 is the difference between the output of the second limiter 8 and the commutation voltage drop at the input end.
The excitation control system of the present embodiment may be used as a part of an excitation regulator for controlling the output excitation voltage UfdThe control principle of the excitation regulator for controlling the excitation of the phase modulator is shown in figure 7. Phase modulator terminal voltage UtAnd stator current ItCan be monitored by a voltage and current transformer, and the reference value Q of the reactive power and the terminal voltageref and Uref, inputting the voltage to an excitation regulator, and regulating the excitation output voltage U of the rectifier in real timecRealize the control of the output voltage of the rectifier bridge and then realize the rotor current I of the phase modulatorfAnd an excitation voltage UfdThe system control response time is between several milliseconds and tens of milliseconds. When the voltage of the power grid fluctuates, the excitation system can quickly adjust the reactive output of the excitation system to track the given value of the voltage of the system; when the bus voltage drops seriously due to short circuit fault and the like, the bus voltage can be quickly adjusted in a forced excitation mode, powerful voltage support is provided, and the probability of commutation failure of the direct-current system is greatly reduced.
Output excitation voltage EfdEqual to the output of the second limiter 8 minus IfdMultiplication by a commutation coefficient, IfdIs direct current and current output by the rectifier, when the rectifier valve performs commutation during rectification, alternating current voltage drop exists between the two commutation arms, and the commutation voltage drop is the current I output by the rectifierfdMultiplying by a commutation coefficient, the control system of this embodiment considers a commutation factor for improving the control accuracy.
The setting range of the first limiter 4 is-50V to 50V, and the setting range of the second limiter 8 may be 280V to 350V.
In some embodiments, a Power System Stabilizer (PSS) is further included for outputting an additional control signal QregThe input of the Power System Stabilizer (PSS) can be the actual value Q of the reactive power of the phase modulatormAny one or two signals of the rotating speed omega of the phase modulator and the working voltage/current frequency f of the phase modulator. The embodiment can set the input of the Power System Stabilizer (PSS) as the actual value Q of the reactive power of the phase modulatormAnd a phase modulator rotational speed ω. Control signals of frequency, rotating speed and the like are added into the excitation control logic to improve the system damping, and meanwhile, the purpose of reducing the low-frequency oscillation of the system can be achieved.
The PSS can effectively keep the active power stable when the active power changes rapidly. Using phase modulator power QmAnd the rotation speed omega signal is used as input, a steady state signal is filtered through a blocking link, and a power fluctuation signal is obtained through numerical value conversion. And finally, obtaining an excitation additional control signal ahead of the phase modulator power fluctuation signal through phase correction, and superposing the excitation additional control signal to the reactive outer ring input end to complete the control action. FIG. 2 is a block diagram of the PSS internal schematic diagram for obtaining additional control signals, where T1、T2For a DC-off time, T3To compensate for time, KQCompensating for gain, QregFor adding a control signal QregAnd is superposed to the input end of the idle outer ring in fig. 2.
The power system stabilizer PSS generates an additional torque coaxial with the rotational speed deviation Δ ω by adjusting the excitation system time lag. The system power deviation, the rotating speed deviation and the frequency deviation are selected and superposed to the input end of the system, the system damping is increased by utilizing the lead and lag links, and the generated coaxial additional torque is superposed to the input end of the excitation regulator, so that the low-frequency oscillation of the system can be inhibited, and the stability of the system is improved.
As shown in fig. 3, Δ TEThe system torque is the system torque without adding PSS; delta TPSSAdditional torque generated for PSS; delta T'ETo a resultant torque. Torque Delta T emitted by conventional quick excitation systemEThe projection on the axis of the rotating speed delta omega is a negative value, and the damping torque is negative; the projection on the power angle Δ axis is positive, positive synchronous torque. Delta T sent by PSS after settingPSSPositive torque is generated on both the Δ ω axis and the Δ axis. Torque Δ T 'is synthesized by superposition'ESynchronous torque is also better when positive damping torque is availableThe large positive damping torque effectively avoids system oscillation step loss, and the larger synchronous torque can effectively inhibit system sliding step loss.
To illustrate the technical effect achieved by the control system of this embodiment, a simulation experiment is performed, which is specifically described as follows:
the mathematical model and parameters of the synchronous phase modulator are set as follows:
in the formula (1), E'd、E″d、E′qAnd E ″)qTransient and sub-transient potentials for the d-and q-axes of the generator, EfdIs an excitation voltage, xd、xqBeing synchronous reactance of d-and q-axes of the generator, x'd、x′qIs a biaxial transient reactance, x ″)d、x″qIs sub-transient reactance, T'd0And T'q0Is a biaxial transient time constant, T ″)d0And T ″)q0Is a sub-transient time constant, MmAs mechanical torque, McIs an electromagnetic torque. Is the angle between the phase modifier potential and the synchronous torque, TJIs the inertia constant of phase modulator, D is the damping coefficient of system, omega and omega0The angular speed of the phase modulator and the angular speed of the synchronous rotating shaft.
Setting the parameters of a phase modulator as 300Mvar, the terminal voltage of 20kV, the frequency of 50Hz, and the other parameters as xd＝1.305、x′d＝0.296、x″d＝0.252、xq＝0.474、x′q＝0.243、x″q＝0.354、T′d0＝1.0ls、T″d0＝0.053s、T″q00.1s, where the respective resistive reactances are per-unit values.
And designing a simulation experiment to simulate the working condition of the phase modulator when the phase modulator suddenly breaks down in a stable operation state. The method comprises the steps of selecting 4 fault types of single-phase grounding short circuit, two-phase grounding short circuit and three-phase grounding short circuit to simulate faults of a phase modulator, wherein simulation results are similar under different fault types, and the three-phase grounding short circuit is selected as a representative. The fault duration lasts 0.1-0.2s to ensure that the phase modulator is not destabilized during the first wobble period.
Comparative simulation was performed using a conventional voltage loop control architecture with the reactive-voltage dual closed loop control architecture presented herein, with terminal voltage, stator current, and excitation voltage response curves for the two control architectures as shown in fig. 4-6. Terminal voltage rating UN20kV, stator current rating IN8660A, rated value of excitation voltage UfNTake 323V. The ordinate in the figure takes a per unit value. The peak-to-valley difference and the adjustment time of the response curve after the fault of the operation system under the voltage closed loop and the double closed loop control structure of the embodiment are shown in the table 1.
As can be seen from table 1, the control effect of the reactive-voltage loop control structure is significantly improved compared with the control structure of the conventional single voltage loop control structure. Compared with the traditional single voltage ring control structure, the reactive-voltage double closed loop control reduces peak-to-valley differences of the voltage at the machine end, the current of the stator and the voltage of the excitation after the fault by 20.95%, 19.96% and 21.54%, and reduces system regulation time by 15.84%, 24.26% and 21.48%. Therefore, the reactive-voltage double closed-loop control has obvious advantages in stability and rapidity.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. A phase modulator excitation control system based on reactive and voltage double closed-loop control is characterized in that: the device comprises a reactive power control outer ring and a voltage control inner ring, wherein the reactive power control outer ring comprises a first comparator and a PI operation module which are connected in sequence, and the voltage control inner ring comprises a second comparator and a PID operation module which are connected in sequence; the output end of the PI operation module is connected with the input end of the second comparator, the PI operation result of the reactive power control outer ring is input to the input end of the voltage control inner ring, and the output of the voltage control inner ring passes through the low excitation limiting device and the low excitation limiting device to obtain excitation voltage and output the excitation voltage to the phase modulator.
2. The phase modulator excitation control system based on reactive and voltage double closed-loop control as claimed in claim 1, characterized in that: the reactive power control outer ring and the voltage control inner ring are connected through a first amplitude limiter, and the first amplitude limiter limits the output of the PI operation result of the reactive power control outer ring within a certain range and inputs the output to the voltage control inner ring.
3. The phase modulator excitation control system based on reactive and voltage double closed-loop control as claimed in claim 1, characterized in that: the input of the first comparator may comprise a reactive power setpoint QrefAdditional control signal QregAnd actual value Q of reactive power of phase modulatormThe first comparator compares the reactive power set value QrefAnd an additional control signal QregAdding and subtracting the actual value Q of the reactive power of the phase modulatormObtaining an output of the first comparator; the output of the first comparator is used as the input of the PI operation module, and is input to the integral link and the proportional link of the PI operation module to respectively perform proportional-integral operation to obtain a PI operation result of the reactive power control outer loop.
4. The excitation control system of the phase modulator based on the reactive and voltage double closed-loop control as claimed in claim 3, characterized in that: also comprises a power system stabilizer for outputting an additional control signal Qreg。
5. The excitation control system of the phase modulator based on the reactive and voltage double closed-loop control as claimed in claim 4, characterized in that: the input of the power system stabilizer is the actual value Q of the reactive power of the phase modulatormAny one or two signals of the rotating speed omega of the phase modulator and the working voltage/current frequency f of the phase modulator.
6. The phase modulator excitation control system based on reactive and voltage double closed-loop control as claimed in claim 1, characterized in that: the proportional parameter of the PI operation module is KQThe integral link parameter is
Wherein: t isQS is an operator in the complex frequency domain, being a time constant.
7. The phase modulator excitation control system based on reactive and voltage double closed-loop control as claimed in claim 1, characterized in that: the input of the second comparator also comprises a phase modulator terminal voltage set value UrefActual value U of terminal voltage of phase modulatorgThe second comparator compares the set value U of the phase modulator terminal voltagerefAnd the PI operation result of the reactive power control outer loop is subtracted, and then the actual value U of the terminal voltage of the phase modulator is subtractedgObtaining an output of the second comparator; the output of the second comparator is used as the input of the PID operation module, and the proportional link, the integral link and the differential link of the PID operation module are respectively input to carry out proportional, integral and differential operations and are superposed to obtain the result of the PID operation of the voltage control inner ring.
8. The phase modulator excitation control system based on reactive and voltage double closed-loop control as claimed in claim 1, characterized in that: the low excitation limiting device is a minimum comparator, the over-excitation limiting device is a maximum comparator, and the minimum comparator and the maximum comparator are connected in series.
9. The excitation control system of the phase modulator based on the reactive and voltage double closed-loop control as claimed in claim 8, characterized in that: the input of the minimum comparator is the result of PID operation of the voltage control inner ring, and the value setting end of the minimum comparator sets the voltage minimum setting value of the minimum comparator;
the input of the maximum comparator is the output of the minimum comparator, and the value setting end of the maximum comparator sets the voltage maximum setting value of the maximum comparator.
10. The phase modulator excitation control system based on reactive and voltage double closed-loop control as claimed in claim 1, characterized in that: and after the low excitation limiting device and the over excitation limiting device, a second amplitude limiter and a third comparator can be sequentially connected, the output of the low excitation limiting device and the output of the over excitation limiting device are limited in a set range by the second amplitude limiter, the input of the third comparator is the output of the second amplitude limiter and the commutation voltage drop, and the output of the third comparator is the difference value of the output of the second amplitude limiter at the input end and the commutation voltage drop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921772359.5U CN211151545U (en) | 2019-10-21 | 2019-10-21 | Phase modulator excitation control system based on reactive and voltage double closed-loop control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921772359.5U CN211151545U (en) | 2019-10-21 | 2019-10-21 | Phase modulator excitation control system based on reactive and voltage double closed-loop control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211151545U true CN211151545U (en) | 2020-07-31 |
Family
ID=71769952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921772359.5U Active CN211151545U (en) | 2019-10-21 | 2019-10-21 | Phase modulator excitation control system based on reactive and voltage double closed-loop control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211151545U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112600470A (en) * | 2020-12-16 | 2021-04-02 | 华北电力大学 | Power tracking excitation control method and system for double-shaft excitation generator |
-
2019
- 2019-10-21 CN CN201921772359.5U patent/CN211151545U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112600470A (en) * | 2020-12-16 | 2021-04-02 | 华北电力大学 | Power tracking excitation control method and system for double-shaft excitation generator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Errouissi et al. | Offset-free direct power control of DFIG under continuous-time model predictive control | |
| CN108092308B (en) | Low voltage ride through control method for distributed virtual synchronous generator | |
| Hu et al. | Direct active and reactive power regulation of DFIG using sliding-mode control approach | |
| CN108429289B (en) | Control method and system based on virtual synchronous generator | |
| Gao et al. | An improved direct power control for doubly fed induction generator | |
| Gomez et al. | Grid synchronisation of doubly fed induction generators using direct torque control | |
| EP2672624B1 (en) | Current controller and generator system | |
| CN112003310B (en) | Coordinated control method for speed regulator and converter of variable-speed pumped storage unit in working condition conversion process | |
| CN107947186B (en) | Starting control method for accessing high-voltage direct-current transmission inversion side to synchronous phase modulator | |
| CN105811825A (en) | Current compensation based power decoupling method of virtual synchronous power generator | |
| CN111030528B (en) | Multi-ring voltage regulation control method for three-stage brushless synchronous motor | |
| CN113013902A (en) | Coordinated control method for speed regulator and converter of variable-speed pumped storage unit in working condition conversion process | |
| CN114825395A (en) | Control strategy of flywheel energy storage network side converter under power grid asymmetric fault | |
| CN115882762A (en) | Frequency optimization control method of grid-connected wind power system | |
| CN211151545U (en) | Phase modulator excitation control system based on reactive and voltage double closed-loop control | |
| CN105763125B (en) | Three-level formula synchronous initiation/generator starting control method based on electric current/rotating speed closed loop at times | |
| CN109039180B (en) | Fractional order control method for grid connection process of doubly-fed induction generator | |
| Yan et al. | Backstepping-Based Direct Power Control for Dual-Cage Rotor Brushless Doubly Fed Induction Generator | |
| CN116683491A (en) | Inertia control method for new energy micro-grid | |
| Sim et al. | Ride-through of PMSG wind power system under the distorted and unbalanced grid voltage dips | |
| Yan et al. | A robust grid synchronization method for cascaded brushless doubly fed induction generator | |
| Li et al. | An overall control of doubly fed variable speed pumped storage unit in pumping mode | |
| Jahanpour-Dehkordi et al. | An improved combined control for PMSG-based wind energy systems to enhance power quality and grid integration capability | |
| Sun et al. | Control of five-phase open-end induction machine drive topology with floating capacitors at optimized DC voltage | |
| Khosravi et al. | Improvement of starting transient state in a fixed speed wind turbine using STATCOM |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |