CN111668855B - Angular static var generator control method and device - Google Patents
Angular static var generator control method and device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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Abstract
The invention discloses a control method and a device for an angular static var generator, wherein the control method comprises the steps of determining three-phase line voltage according to the front-end phase voltage of a transformer of a grid-connected point of the angular static var generator; determining a three-phase angular current instruction according to the three-phase line load current and the phase angle of the three-phase grid voltage; determining a final current instruction according to the three-phase line voltage and the three-phase angular current instruction; determining a three-phase control quantity according to the current output by the three-phase chain links of the angular static reactive generator and a final current instruction; and determining a final three-phase control quantity according to the three-phase line voltage and the three-phase control quantity, so that the angle-type static var generator is driven by pulse width modulation through the final three-phase control quantity to complete the control of the power system. The invention not only effectively weakens the coupling relation between voltage feedforward and angular SVG reactive current control, but also can effectively reduce the interference of load harmonic waves to an angular SVG control power system, and enhance the robustness and stability of the angular SVG.
Description
Technical Field
The invention discloses a control method and a device for an angular static var generator.
Background
In the electric power system, a large amount of unbalanced nonlinear loads such as an arc furnace, an electrolytic rectifier, an electrified railway and the like exist, and the reactive power, the harmonic wave and the negative sequence current generated by the loads cause the electric energy quality problem, so that not only is a large amount of electric energy lost caused, but also serious threat is caused to the safe and economic operation of a power grid.
With the development of power systems in recent years, a static var generator (static var generator, SVG) based on a cascading type multi-level structure has the advantages of high reactive power regulation response speed, modularized structure, ideal output characteristics and the like, and is one of the most effective power quality problem solutions in the current high-voltage high-capacity application occasions. SVG based on cascade multilevel structure can be divided into two categories according to topology: star connection and delta connection. Related scholars research finds that the star-connected cascading SVG has limited negative sequence compensation capability although the cost is relatively low, and is mainly applied to the reactive power compensation field. The angular connection cascading SVG can perform split-phase control, can realize comprehensive compensation of reactive power and negative sequence current, has stronger power grid asymmetric operation capability, can effectively inhibit the influence of power grid voltage fluctuation and distortion on angular SVG output current by introducing power grid voltage feedforward, and can enhance the anti-interference capability of angular SVG, but directly introduces power grid voltage as a control quantity, can cause mutual coupling of power grid voltage feedforward control and grid-connected current control, and is unfavorable for the stability of angular SVG control, and particularly under the condition of larger load harmonic wave, the direct introduction of power grid voltage feedforward can easily cause oscillation and runaway of a system.
Therefore, the existing angular SVG control method can lead to the mutual coupling of the feedforward control of the grid voltage and the grid-connected current control by directly introducing the grid voltage as the control quantity, is unfavorable for the control stability of the angular static var generator, and is easy to cause the problems of oscillation and out-of-control of a power system.
Disclosure of Invention
The invention provides a control method of an angular static var generator, which aims to solve the problems that the prior angular SVG control method directly introduces grid voltage as a control quantity, which can cause the mutual coupling of the feedforward control of the grid voltage and the grid-connected current control, is unfavorable for the control stability of the angular static var generator and is easy to cause oscillation and out of control of a power system.
One aspect of the invention relates to a method for controlling an angular static var generator, comprising:
determining the three-phase line voltage of the grid-connected point of the angular static var generator according to the front-end phase voltage of the grid-connected point transformer of the angular static var generator;
determining the phase angle of the three-phase power grid voltage according to the three-phase line voltage;
determining a three-phase angular current instruction according to the three-phase line load current and the phase angle of the three-phase grid voltage;
determining a final current instruction according to the three-phase line voltage and the three-phase angular current instruction;
determining a three-phase control quantity according to the current output by the three-phase chain link of the angular static var generator and a final current instruction;
and determining a final three-phase control quantity according to the three-phase line voltage and the three-phase control quantity, so that the angle-type static var generator is driven by pulse width modulation through the final three-phase control quantity to complete control of an electric power system.
Another aspect of the invention relates to an angular static var generator control device comprising:
the virtual voltage module is used for determining the three-phase line voltage of the grid-connected point of the angular static var generator according to the front-end phase voltage of the grid-connected point transformer of the angular static var generator;
the three-phase voltage phase-locked loop module is used for determining the phase angle of the three-phase power grid voltage according to the three-phase line voltage;
the command current generation module is used for determining a three-phase angular current command according to the three-phase line load current and the phase angle of the three-phase grid voltage;
the phase link direct current voltage balance module is used for determining a final current instruction according to the three-phase line voltage and the three-phase angular current instruction;
the current controller module is used for determining three-phase control quantity according to the current output by the three-phase chain link of the angular static var generator and a final current instruction; and
and the voltage feedforward module is used for determining a final three-phase control quantity according to the three-phase line voltage and the three-phase control quantity so as to drive the angle-type static var generator to complete the control of the power system through pulse width modulation according to the final three-phase control quantity.
According to the angular static var generator control method, the three-phase line voltage of the grid-connected point of the angular static var generator is determined according to the front-end phase voltage of the transformer of the grid-connected point of the angular static var generator; determining the phase angle of the three-phase power grid voltage according to the three-phase line voltage; determining a three-phase angular current instruction according to the three-phase line load current and the phase angle of the three-phase grid voltage; determining a final current instruction according to the three-phase line voltage and the three-phase angular current instruction; determining a three-phase control quantity according to the current output by the three-phase chain link of the angular static var generator and a final current instruction; determining a final three-phase control quantity according to the three-phase line voltage and the three-phase control quantity, so that the angle-type static var generator is driven by pulse width modulation through the final three-phase control quantity to complete control of a power system; the control method not only effectively weakens the coupling relation between voltage feedforward and reactive current control of the angular static reactive generator, but also can effectively reduce the interference of load harmonic waves on a control power system of the angular static reactive generator, and enhance the robustness and stability of the angular static reactive generator.
Drawings
FIG. 1 is a flow chart of an angular static var generator control method according to the present invention;
FIG. 2 is a flow chart of another angular static var generator control method according to the present invention;
FIG. 3 is a flow chart of an implementation of yet another preferred angular static var generator control method provided by the present invention;
FIG. 4 is a flow chart of an implementation of a further angular static var generator control method provided by the present invention;
FIG. 5 is a flow chart of an implementation of a method for controlling an angular static var generator according to the present invention;
FIG. 6 is a schematic diagram of a control device for an angular static var generator according to the present invention;
fig. 7 is a schematic diagram of an electrical connection structure of the angular static var generator provided by the invention in a power grid;
FIG. 8 is a schematic diagram of a command current generating module according to the present invention;
FIG. 9 is a schematic diagram of a phase link DC voltage balancing module according to the present invention;
FIG. 10 is a schematic diagram of simulation results of the angular static var generator control method provided by the invention using a virtual voltage module;
FIG. 11 is a schematic diagram of a comparative simulation result without applying a virtual voltage module according to the present invention.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
In order to solve the problems that the direct introduction of the power grid voltage as a control quantity of the existing angular static var generator can cause the mutual coupling of the feedforward control of the power grid voltage and the grid-connected current control, which is not beneficial to the angular static var generator to control the stability of a power system and easily cause oscillation and out of control of the power system, the embodiment of the invention provides a control method of the angular static var generator, which comprises the steps of determining the three-phase line voltage of the grid-connected point of the angular static var generator according to the front-end phase voltage of the transformer of the grid-connected point of the angular static var generator; determining the phase angle of the three-phase power grid voltage according to the three-phase line voltage; determining a three-phase angular current instruction according to the three-phase line load current and the phase angle of the three-phase grid voltage; determining a final current instruction according to the three-phase line voltage and the three-phase angular current instruction; determining a three-phase control quantity according to the current output by the three-phase chain link of the angular static var generator and a final current instruction; determining a final three-phase control quantity according to the three-phase line voltage and the three-phase control quantity, so that the angle-type static var generator is driven by pulse width modulation through the final three-phase control quantity to complete control of a power system; the control method not only effectively weakens the coupling relation between voltage feedforward and reactive current control of the angular static reactive generator, but also can effectively reduce the interference of load harmonic waves on a control power system of the angular static reactive generator, and enhance the robustness and stability of the angular static reactive generator.
Example 1
Fig. 1 shows a flow of implementation of a control method for an angular static var generator according to embodiment 1 of the present invention, and for convenience of explanation, only the relevant parts of the embodiment of the present invention are shown, which is described in detail below:
in step S101, the three-phase line voltage of the grid-connected point of the angular static var generator is determined according to the front-end phase voltage of the transformer of the grid-connected point of the angular static var generator.
In the embodiment of the invention, the three-phase line voltage is the angular SVG grid-connected point three-phase line voltage u ab 、u bc 、u ca . Front-end phase electricity u 'of transformer according to angular SVG grid-connected point' A 、u′ B 、u′ C And calculating the three-phase line voltage of the SVG grid-connected point. According to the ideal transformer principle, the virtual secondary line voltage is calculated by the primary phase voltage, and the calculation formula is different according to the different transformer structures.
Specifically, the voltage is processed by per unit method, and the relationship of the connection groups can be found out by combining the secondary side line voltage u ab And a primary side phase voltage u' A The vectors are in phase, and so on, the following virtual relationship can be obtained:
thereby obtaining the three-phase line voltage u ab 、u bc 、u ca 。
In step S102, a phase angle of the three-phase network voltage is determined from the three-phase line voltage.
In the embodiment of the invention, the three-phase line voltage u ab 、u bc 、u ca Through abc/dq transformation matrix C abc/dq Obtaining U q ；U q And the phase angle omega t of the three-phase power grid voltage is obtained by sending the three-phase power grid voltage into a phase locking module through a low-pass filter, and passing through a PI regulator, an integrator and a residual module.
In step S103, a three-phase delta current command is determined from the three-phase load current and the phase angle of the three-phase network voltage.
In a preferred embodiment of the present invention, as shown in fig. 2, the step S103 specifically includes:
in step S201, a reactive harmonic compensation command for the three-phase angular link current is determined according to the three-phase line load current.
In another preferred embodiment of the present invention, as shown in fig. 3, the step S201 includes:
in step S301, a positive-sequence active component is determined from the three-phase line load current.
In the embodiment of the invention, the three-phase line load current i is collected a1 、i b1 、i c1 Through abc/dq transformation matrix C abc/dq Obtaining positive order active component i d 。
In step S302, a three-phase active component is determined from the positive-sequence active component and the positive-sequence reactive component.
In the embodiment of the invention, the positive sequence reactive component i is caused to be q =0, will i d 、i q Through dq/abc transformation matrix C dq/abc Obtaining three-phase active component i pa 、i pb 、i pc 。
In step S303, a reactive harmonic compensation command of the three-phase angular linking current is determined according to the three-phase line load current and the three-phase active component;
in the embodiment of the invention, three-phase line load current i a1 、i b1 、i c1 Respectively and three-phase active components i pa 、i pb 、i pc Making difference to obtain three-phase instructionThe instruction passing through a transformation matrix C Y/Δ Obtaining reactive harmonic compensation instruction of three-phase angular link current>
In step S202, a zero sequence current command is determined from the three phase load current and the phase angle of the three phase grid voltage.
In still another preferred embodiment of the present invention, as shown in fig. 4, the step S202 includes:
in step S401, the negative sequence active and reactive components are determined from the three phase line load current.
In the embodiment of the invention, the three-phase line load current i is collected a1 、i b1 、i c1 Through a negative sequence abc/dq transformation matrix C' abc/dq Obtaining negative-sequence active and reactive components
In step S402, a direct current component is determined from the negative sequence active and reactive components.
In the embodiment of the invention, the negative-sequence active and reactive components are respectively extracted into direct-current components after passing through a low-pass filter
In step S403, a zero sequence current command is determined from the direct current component and the phase angle of the three-phase network voltage.
In the embodiment of the invention, the direct current component is used for generating the direct currentAnd the phase angle ωt of the three-phase mains voltage by algebraic arithmetic +.>Obtain zero sequence current instruction->
In step S203, the zero sequence current command and the reactive harmonic compensation of the three-phase angular link current are added to obtain a three-phase angular current command.
In the embodiment of the invention, the zero sequence current is instructedAdding the three-phase angular linking current reactive harmonic compensation to obtain a three-phase angular instruction +.>
In step S104, a final current command is determined based on the three-phase line voltage and the three-phase angular current command.
In still another preferred embodiment of the present invention, as shown in fig. 5, the step S104 includes:
in step S501, a three-phase dc voltage balance command is determined from the three-phase unit dc voltages and the three-phase line voltages.
In the embodiment of the invention, in order to offset the active power consumption of each unit in each phase, the total direct-current voltage of the real-time control unit is stable. The unit direct current voltage is given as a certain definite value, the feedback is the average value of the three-phase direct current voltages of each unit, and the three-phase error signal is respectively combined with the three-phase line voltage u obtained by the virtual voltage module 101 after passing through the PI regulator ab 、u bc 、u ca Multiplication to obtain three-phase DC voltage balance instruction
In step S502, the three-phase dc voltage balance command and the three-phase angular command are added to obtain a final current command.
In the embodiment of the invention, the current command is givenRespectively and instruction->Adding to obtain the final current command +.>
In step S105, a three-phase control amount is determined according to the current output from the three-phase link of the angular static var generator and the final current command.
In the embodiment of the invention, the final current command is given as the aboveFeedback is the current i output by each chain link of the collected angular SVG three phases ab 、i bc 、i ca The three-phase error signal is passed through three identical controllers to obtain three-phase control quantity u ab1 、u bc1 、u ca1 The controller consists of a P controller and repeated control in parallel.
In step S106, a final three-phase control amount is determined according to the three-phase line voltage and the three-phase control amount, so that the angular static var generator is driven by pulse width modulation through the final three-phase control amount to complete control of the power system.
In the embodiment of the invention, the three-phase line voltage u obtained by the calculation is calculated ab 、u bc 、u ca And a three-phase control amount u obtained by the current controller module ab1 、u bc1 、u ca1 Respectively adding to obtain final control three-phase control quantity u abcon 、u bccon 、u cacon The method comprises the steps of carrying out a first treatment on the surface of the And then each unit of the angular SVG is driven by a PWM generator to complete the control of the whole power system.
According to the angular static var generator control method provided by the embodiment of the invention, the three-phase line voltage of the grid-connected point of the angular static var generator is determined through the front-end phase voltage of the transformer of the grid-connected point of the angular static var generator, and then a final current instruction is determined through the three-phase line load current, the three-phase line voltage and the phase angle of the three-phase grid voltage; determining a final three-phase control quantity according to the three-phase line voltage, the current output by the three-phase chain link of the angular static var generator and a final current instruction, so that the angular static var generator is driven by pulse width modulation through the final three-phase control quantity to complete control of a power system; the method not only effectively weakens the coupling relation between voltage feedforward and reactive current control of the angular static var generator, but also can effectively reduce the interference of load harmonic waves on a control power system of the angular static var generator, and enhance the robustness and stability of the angular static var generator.
Example 2
Fig. 6 shows a schematic structural diagram of a control device for an angular static var generator provided in embodiment 2 of the present invention, for convenience of description, only showing the relevant parts of the embodiment of the present invention, and taking as an example that a transformer connection group in the schematic structural diagram of the angular static var generator in a power grid is YNd1, in fig. 7, three-phase voltage of the power grid is input through a PT to obtain a virtual voltage module, that is, the power grid voltage is sampled through the PT and then transmitted to a control device, and the control device controls the functions of the following modules to generate control instructions to control the links of AB, BC and CA; the specific details are as follows:
in the embodiment of the invention, the angular static var generator control device comprises a virtual voltage module 601, a three-phase voltage phase-locked loop module 602, a command current generation module 603, a phase link direct current voltage balance module 604, a current controller module 605 and a voltage feedforward module 606.
The virtual voltage module 601 is configured to determine a three-phase line voltage of a grid-connected point of the angular static var generator according to a front-end phase voltage of the transformer of the grid-connected point of the angular static var generator.
In the embodiment of the invention, the virtual voltage module is used for calculating and obtaining the three-phase line voltage u of the angular SVG grid-connected point ab 、u bc 、u ca . The coupling degree of the angular SVG and reactive current can be effectively reduced through the module. The input of the module is the front-end phase electricity u 'of the angular SVG grid-connected point transformer' A 、u′ B 、u′ C And outputting three-phase line voltage which is SVG grid-connected point. According to the ideal transformer principle, the virtual secondary line voltage is calculated by the primary phase voltage, and the calculation formula is different according to the different transformer structures.
Specifically, the voltage is processed by per unit method, and the connection group relation is combinedIt can be seen that the secondary side line voltage u ab And a primary side phase voltage u' A The vectors are in phase, and so on, the following virtual relationship can be obtained:
thereby obtaining the three-phase line voltage u ab 、u bc 、u ca 。
The three-phase voltage phase-locked loop module 602 is configured to determine a phase angle of a three-phase power grid voltage according to the three-phase line voltage.
In an embodiment of the present invention, the three-phase voltage phase-locked loop module is configured to detect a phase angle ωt of the three-phase grid voltage. The three-phase line voltage u obtained by the virtual voltage module ab 、u bc 、u ca Through abc/dq transformation matrix C abc/dq Obtaining the power grid voltage quadrature axis component U q ；U q And the phase angle omega t of the three-phase power grid voltage is obtained by sending the three-phase power grid voltage into a phase locking module through a low-pass filter, and passing through a PI regulator, an integrator and a residual module.
The command current generating module 603 is configured to determine a three-phase angular current command according to a three-phase line load current and a phase angle of the three-phase grid voltage;
in a preferred embodiment of the present invention, as shown in fig. 8, the command current generation module 603 includes a compensation command determination submodule 801, a zero sequence current command determination submodule 802, and a three-phase angular current command determination submodule 803.
The compensation command determining submodule 801 is configured to determine a reactive harmonic compensation command of the three-phase angular link current according to the three-phase line load current.
In the embodiment of the present invention, the compensation instruction determining submodule 801 is configured to determine a positive-sequence active component according to a three-phase line load current; determining a three-phase active component according to the positive sequence active component and the positive sequence reactive component; according to the three-phase line load current and the three-phase active component, determining a three-phase angular linking current reactive harmonic compensation instruction; tool withIn the body, three-phase line load current i is acquired a1 、i b1 、i c1 Through abc/dq transformation matrix C abc/dq Obtaining positive order active component i d The method comprises the steps of carrying out a first treatment on the surface of the Let the positive sequence reactive component i q =0, will i d 、i q Through dq/abc transformation matrix C dq/abc Obtaining three-phase active component i pa 、i pb 、i pc The method comprises the steps of carrying out a first treatment on the surface of the Three phase load current i a1 、i b1 、i c1 Respectively and three-phase active components i pa 、i pb 、i pc Making difference to obtain three-phase instructionThe instruction passing through a transformation matrix C Y/Δ Obtaining reactive harmonic compensation instruction of three-phase angular link current>
The zero sequence current command determining submodule 802 is configured to determine a zero sequence current command according to a three-phase line load current and a phase angle of the three-phase grid voltage.
In another preferred embodiment of the present invention, the zero sequence current command determination submodule 802 is configured to determine negative sequence active and reactive components from three-phase line load currents; determining a direct current component according to the negative sequence active and reactive components; determining a zero sequence current instruction according to the direct current component and the phase angle of the three-phase grid voltage; specifically, a three-phase line load current i is acquired a1 、i b1 、i c1 Through a negative sequence abc/dq transformation matrix C' abc/dq Obtaining negative-sequence active and reactive componentsRespectively extracting DC component +.>Algebraic operation of negative sequence active and reactive currentObtain zero sequence current instruction->
The three-phase angular current instruction determining submodule 803 is configured to add the zero-sequence current instruction and the reactive harmonic compensation of the three-phase angular link current to obtain a three-phase angular current instruction.
In the embodiment of the present invention, the three-phase angular current command determining submodule 803 is configured to add the zero-sequence current command and the reactive harmonic compensation of the three-phase angular link current to obtain the three-phase angular command
The phase link dc voltage balancing module 604 is configured to determine a final current command based on the three phase line voltages and the three phase angular current command.
In yet another preferred embodiment of the present invention, as shown in fig. 9, the phase link dc voltage balancing module 604 includes a three-phase dc voltage balancing command determining sub-module 901 and a final current command determining sub-module 902.
The three-phase dc voltage balance command determining sub-module 901 is configured to determine a three-phase dc voltage balance command according to the three-phase dc voltages of each unit and the three-phase line voltage.
In the embodiment of the invention, in order to offset the active power consumption of each unit in each phase, the total direct-current voltage of the real-time control unit is stable. The unit direct current voltage is given as a certain definite value, the feedback is the average value of the three-phase direct current voltages of each unit, and the three-phase error signal is respectively combined with the three-phase line voltage u obtained by the virtual voltage module 101 after passing through the PI regulator ab 、u bc 、u ca Multiplication to obtain three-phase DC voltage balance instruction
The final current command determining sub-module 902 is configured to add the three-phase dc voltage balance command and the three-phase angular command to obtain a final current command.
In the embodiment of the present invention, the final current command determination submodule 902 is configured to command a currentRespectively and instruction->Adding to obtain the final current command +.>
The current controller module 605 is configured to determine a three-phase control amount according to the current output by the three-phase link of the angular static var generator and the final current command.
In the embodiment of the invention, the instruction obtained for the above module is givenFeedback is the current i output by each chain link of the collected angular SVG three phases ab 、i bc 、i ca The three-phase error signal is passed through three identical controllers to obtain three-phase control quantity u ab1 、u bc1 、u ca1 The controller consists of a P controller and repeated control in parallel.
The voltage feedforward module 606 is configured to determine a final three-phase control amount according to the three-phase line voltage and the three-phase control amount, so as to drive the angular static var generator to complete control of the power system through pulse width modulation according to the final three-phase control amount.
In the embodiment of the invention, the three-phase line voltage u calculated by the virtual voltage module ab 、u bc 、u ca And a three-phase control amount u obtained by the current controller module ab1 、u bc1 、u ca1 Respectively adding to obtain final control three-phase control quantity u abcon 、u bccon 、u cacon The method comprises the steps of carrying out a first treatment on the surface of the However, the method is thatAnd then each unit of the angular SVG is driven by a PWM generator to complete the control of the whole power system.
According to the angular static var generator control device provided by the embodiment of the invention, the three-phase line voltage of the grid-connected point of the angular static var generator is obtained through the introduction of the virtual voltage module, and then a final current instruction is determined by the three-phase line load current, the three-phase line voltage and the phase angle of the three-phase grid voltage; and then according to the three-phase line voltage, the current output by the three-phase chain link of the angular static var generator and a final current instruction, determining a final three-phase control quantity, so that the angular static var generator is driven by pulse width modulation through the final three-phase control quantity to complete the control of the power system.
Example 3
The angular static var generator control method (a virtual voltage module simulation result adopted by the invention) provided by the invention is simulated in MATLAB/SIMULINK, the simulation result is shown in figure 10, 6kV and 12MVar are taken as references in the simulation, SVG does not operate before 0.2s, and the three-phase uncontrollable rectification load is connected, so that the current of the power grid is severely distorted; after 0.2s, the SVG starts to operate, and the SVG outputs harmonic current required by the current compensation load, so that the current distortion of the power grid is obviously reduced, and the influence of the harmonic current on the power grid is reduced.
When the simulation is compared under the same working condition and the virtual voltage module adopted by the invention is not applied, namely the feedforward voltage is directly sampled through PT, as shown in figure 11, the system is out of control after SVG operation at the moment of 0.2s, and the voltage power grid cannot be effectively compensated.
Example 4
In one embodiment, the angular static var generator control apparatus provided by the present invention may be implemented in the form of a computer program that is operable on a control device. The memory of the control device may store various program modules constituting the angular static var generator control device, such as a virtual voltage module 601, a three-phase voltage phase-locked loop module 602, a command current generation module 603, a phase link dc voltage balancing module 604, a current controller module 605, and a voltage feedforward module 606, as shown in fig. 6. The computer program of each program module causes the processor to carry out the steps of the angular static var generator control method of each embodiment of the invention described in the present specification.
For example, the control device may perform step S101 by means of the virtual voltage module 601 in the angular static var generator control apparatus as shown in fig. 6. The control device may perform step S102 through the three-phase voltage phase-locked loop module 602. The control device may perform step S103 by commanding the current generation module 603. The control device may perform step S104 through the phase link dc voltage balancing module 604. The control device may perform step S105 through the current controller module 605. The control device may perform step S106 through the voltage feedforward module 606.
Example 5
In one embodiment, a control device is provided, the control device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the computer program comprising program instructions for invoking the program instructions to perform the steps of:
determining the three-phase line voltage of the grid-connected point of the angular static var generator according to the front-end phase voltage of the grid-connected point transformer of the angular static var generator;
determining the phase angle of the three-phase power grid voltage according to the three-phase line voltage;
determining a three-phase angular current instruction according to the three-phase line load current and the phase angle of the three-phase grid voltage;
determining a final current instruction according to the three-phase line voltage and the three-phase angular current instruction;
determining a three-phase control quantity according to the current output by the three-phase chain link of the angular static var generator and a final current instruction;
and determining a final three-phase control quantity according to the three-phase line voltage and the three-phase control quantity, so that the angle-type static var generator is driven by pulse width modulation through the final three-phase control quantity to complete control of an electric power system.
Example 6
In one embodiment, a computer readable storage medium is provided, having stored thereon a computer program comprising program instructions that when executed by a processor cause the processor to perform the steps of:
determining the three-phase line voltage of the grid-connected point of the angular static var generator according to the front-end phase voltage of the grid-connected point transformer of the angular static var generator;
determining the phase angle of the three-phase power grid voltage according to the three-phase line voltage;
determining a three-phase angular current instruction according to the three-phase line load current and the phase angle of the three-phase grid voltage;
determining a final current instruction according to the three-phase line voltage and the three-phase angular current instruction;
determining a three-phase control quantity according to the current output by the three-phase chain link of the angular static var generator and a final current instruction;
and determining a final three-phase control quantity according to the three-phase line voltage and the three-phase control quantity, so that the angle-type static var generator is driven by pulse width modulation through the final three-phase control quantity to complete control of an electric power system.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A method of controlling an angular static var generator, comprising:
determining the three-phase line voltage of the grid-connected point of the angular static var generator according to the front-end phase voltage of the grid-connected point transformer of the angular static var generator;
determining the phase angle of the three-phase power grid voltage according to the three-phase line voltage;
determining a three-phase angular current instruction according to the three-phase line load current and the phase angle of the three-phase grid voltage;
determining a final current instruction according to the three-phase line voltage and the three-phase angular current instruction;
determining a three-phase control quantity according to the current output by the three-phase chain link of the angular static var generator and a final current instruction;
determining a final three-phase control quantity according to the three-phase line voltage and the three-phase control quantity, so that the angular static var generator is driven by pulse width modulation through the final three-phase control quantity to complete control of a power system;
the step of determining a three-phase angular current instruction according to the three-phase line load current and the phase angle of the three-phase grid voltage specifically comprises the following steps:
according to the three-phase line load current, determining a reactive harmonic compensation instruction of the three-phase angular link current;
determining a zero sequence current instruction according to the three-phase line load current;
and adding the zero sequence current instruction and the reactive harmonic compensation instruction of the three-phase angular link current to obtain the three-phase angular current instruction.
2. The method for controlling an angular static var generator according to claim 1, wherein said step of determining a three-phase angular link current reactive harmonic compensation command based on said three-phase line load current, comprises:
determining a positive sequence active component according to the three-phase line load current;
determining a three-phase active component according to the positive sequence active component and the positive sequence reactive component;
and determining a reactive harmonic compensation instruction of the three-phase angular linking current according to the three-phase line load current and the three-phase active component.
3. The method for controlling an angular static var generator according to claim 1, characterized in that said step of determining a zero sequence current command according to said three phase line load current comprises in particular:
determining negative sequence active and reactive components according to the three-phase line load current;
determining a direct current component according to the negative sequence active and reactive components;
and determining a zero sequence current instruction according to the direct current component and the phase angle of the three-phase grid voltage.
4. The angular static var generator control method according to claim 1, wherein said step of determining a final current command based on said three phase line voltage and three phase angular current command, comprises:
determining a three-phase direct-current voltage balance instruction according to the three-phase direct-current voltages of each unit and the three-phase line voltage;
and adding the three-phase direct-current voltage balance instruction and the three-phase angular current instruction to obtain a final current instruction.
5. An angular static var generator control device, comprising:
the virtual voltage module is used for determining the three-phase line voltage of the grid-connected point of the angular static var generator according to the front-end phase voltage of the grid-connected point transformer of the angular static var generator;
the three-phase voltage phase-locked loop module is used for determining the phase angle of the three-phase power grid voltage according to the three-phase line voltage;
the command current generation module is used for determining a three-phase angular current command according to the three-phase line load current and the phase angle of the three-phase grid voltage;
the phase link direct current voltage balance module is used for determining a final current instruction according to the three-phase line voltage and the three-phase angular current instruction;
the current controller module is used for determining three-phase control quantity according to the current output by the three-phase chain link of the angular static var generator and a final current instruction; and
the voltage feedforward module is used for determining a final three-phase control quantity according to the three-phase line voltage and the three-phase control quantity so as to drive the angular static var generator to complete the control of the power system through pulse width modulation according to the final three-phase control quantity;
the instruction current generation module includes:
the compensation instruction determining submodule is used for determining a reactive harmonic compensation instruction of the three-phase angular linking current according to the three-phase line load current;
the zero sequence current instruction determining submodule is used for determining a zero sequence current instruction according to the three-phase line load current and the phase angle of the three-phase power grid voltage; and
and the three-phase angular current instruction determining submodule is used for adding the zero-sequence current instruction and the three-phase angular link current reactive harmonic compensation instruction to obtain the three-phase angular current instruction.
6. The angular static var generator control device according to claim 5,
the compensation instruction determining submodule is used for determining a positive sequence active component according to the three-phase line load current; determining a three-phase active component according to the positive sequence active component and the positive sequence reactive component; and determining a reactive harmonic compensation instruction of the three-phase angular linking current according to the three-phase line load current and the three-phase active component.
7. The angular static var generator control device according to claim 5,
the zero sequence current instruction determining submodule is used for determining negative sequence active and reactive components according to the three-phase line load current; determining a direct current component according to the negative sequence active and reactive components; and determining a zero sequence current instruction according to the direct current component and the phase angle of the three-phase grid voltage.
8. The angular static var generator control device of claim 5, wherein said phase link dc voltage balancing module comprises:
the three-phase direct current voltage balance instruction determining submodule is used for determining a three-phase direct current voltage balance instruction according to the direct current voltage of each three-phase unit and the three-phase line voltage; and
and the final current instruction determining submodule is used for adding the three-phase direct-current voltage balance instruction and the three-phase angular current instruction to obtain a final current instruction.
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