CN110739714A - Online smooth switching method for islanding and networking modes of flexible direct converter valves - Google Patents
Online smooth switching method for islanding and networking modes of flexible direct converter valves Download PDFInfo
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- CN110739714A CN110739714A CN201911009549.6A CN201911009549A CN110739714A CN 110739714 A CN110739714 A CN 110739714A CN 201911009549 A CN201911009549 A CN 201911009549A CN 110739714 A CN110739714 A CN 110739714A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- 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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
flexible direct converter valve island and networking mode online smooth switching methods, flexible direct converter valve island and networking mode online smooth switching methods, including active instruction switching module, reactive instruction switching module, power control module, voltage control module and current control module, the output of active power instruction switching module and the output of reactive instruction switching module are connected with the active given input end and the reactive given input end of power control module respectively, the output of power control module is connected with the input of voltage control module and the input of active instruction switching module, the output of voltage control module is connected with the input of current control module after being added with the grid feedforward current respectively, the current control module outputs the final dq axis voltage modulation signal of converter valve, the stability of flexible direct converter valve in island and networking mode switching process can be improved.
Description
Technical Field
The invention relates to the technical field of flexible direct current transmission converter valve control, in particular to an on-line smooth switching method for an islanding and networking mode of flexible direct current converter valves.
Background
The flexible direct current transmission converter valve is widely applied to the fields of asynchronous interconnection of power grids, large-scale new energy grid connection of wind power and the like, the converter valve usually adopts a modular multilevel structure, a plurality of power modules are connected in series to form 1 bridge arm of the converter valve, the converter valve has 6 symmetrical bridge arms, each power module is formed by connecting a fully-controlled power device (IGBT, IEGT) in a half-bridge or full-bridge mode, the flexible direct current transmission converter valve can be connected with a weak alternating current system, supplies power to a passive network, improves the penetrating power of the new energy such as wind power and the like connected into the power grid and the like.
In the process of switching between isolated island and networking operation, a network side alternating current switch and a converter valve control mode need to be closely matched, but delay and uncertainty exist in the processes of switching on time of an alternating current breaker, switching between control modes and the like in actual engineering, and the system switching process usually has larger disturbance to cause the switching failure of the system operation mode to trip and influence the system stability.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides kinds of flexible direct current converter valve island and networking mode online smooth switching methods, which can improve the stability of the flexible direct current converter valve in the island and networking operation mode switching process.
In order to achieve the purpose, the invention adopts the following technical scheme:
Flexible direct current converter valve island and networking mode online smooth switching method comprises an active instruction switching module, a reactive instruction switching module, a power control module, a voltage control module and a current control module, wherein a second active given signal P at the output end of the active instruction switching moduleref2And a second reactive given signal Q at the output end of the reactive instruction switching moduleref2Respectively connected with the active given input end of the power control modulePrefAnd a given reactive input QrefD-axis voltage given signal U at output end of connected power control moduledrefAnd q-axis voltage given signal UqrefConnected with the input end of the voltage control module and used for synchronizing the phase calculation value thetacal d-axis current given signal I connected with the input end of the switching module of the active command and the output end of the voltage control moduledref1And q-axis current setting signal Iqref1Respectively feed forward current I to the gridgdAnd IgqAfter adding, the current is limited by and two, and then is connected with the input end I of the current control moduledref2And Iqref2The current control module outputs the final d-axis and q-axis voltage modulation signals V of the converter valvedrefAnd Vqref。
The input quantity of the active command switching module comprises th active given signal Pref1Grid phase thetaPLLSynchronous phase θ of power control module outputcalAnd a control mode signal with an output of a second active power given signal, wherein the control mode signal has two signal values of 0 and 1 and is connected with a control end S of the mode selection switch, when the control end is 0, an output end Out of the mode selection switch is connected with an input end In1 of the mode selection switch, when the control end is 1, the output end Out of the mode selection switch is connected with a second input end In2 of the mode selection switch, an input end In1 of the mode selection switch is connected with an input number active power given signal P of the active power instruction switching moduleref1Connected to each other, a second input terminal In2 of the mode selection switch is connected to the output terminal of the phase adjuster PI1, the grid phase θPLLSynchronous phase theta with power module outputcalThe difference is subjected to sine calculation and sin and then is connected with the input end of a phase regulator PI 1; outputting a second active given signal Pref2Connected with the output end Out of the mode selection switch; the phase adjuster PI1 is a proportional-integral adjuster.
The input quantity of the reactive instruction switching module comprises: a.c. voltage amplitude given signal ErefFeedback signal E of amplitude of AC voltagefbk th reactive power given signal Qref1And a control moduleA signal of formula (II); the output quantity is a second reactive given signal Qref2The control mode signal has two signal values of 0 and 1 and is connected with the control end of the mode selection switch, when the control end is 0, the output end Out of the mode selection switch is connected with the th input end In1 of the mode selection switch, when the control end is 1, the output end Out of the mode selection switch is connected with the second input end In2 of the mode selection switch, the th input end In1 of the mode selection switch is connected with the input number reactive given signal Q of the reactive instruction switching moduleref1Connected to the second input terminal In2 of the mode selection switch, and connected to the output terminal of the voltage amplitude regulator PI2, the AC voltage amplitude given signal ErefAnd AC voltage amplitude feedback signal EfbkIs connected with the input end of a voltage amplitude regulator PI 2; outputting a second reactive given signal Qref2Connected with the output end Out of the mode selection switch; the voltage amplitude regulator PI2 is a proportional-integral regulator.
The input quantity of the power control module comprises: active power given signal PrefActive power feedback signal PfbkReactive power given signal QrefReactive power feedback signal Qfbk(ii) a The output quantity comprises: d-axis voltage given signal UdrefQ-axis voltage given signal UqrefAnd the calculated value of the synchronous phase thetacal(ii) a Active power given signal PrefAnd an active power feedback signal PfbkThe difference value is connected with the Kp input end of an active power regulator, and the Kp output end of the active power regulator is connected with the rated angular frequency omega of the power grid0The sum is connected with the input end of the integrator, and the output end of the integrator is thetacalIs connected with the phase input end of the coordinate transformation module; given signal Q of reactive powerrefAnd a reactive power feedback signal QfbkThe difference value of the voltage difference value is connected with the input end of a reactive power regulator PI4, the output end of the reactive power regulator is connected with the amplitude input end of a Kp-dq coordinate transformation module, the Kp-dq coordinate transformation realizes the transformation from a polar coordinate to a synchronous rotation coordinate, and the output end and the second output end of the Kp-dq coordinate transformation module are respectively connected with the output quantity d-axis voltage given signal U of the power control moduledrefAnd q-axis voltage given signal UqrefConnecting; wherein the active power regulator Kp is a proportional regulator.
The voltage control module input quantity comprises: d-axis voltage given signal U output by power control moduledrefAnd q-axis voltage given signal UqrefAnd d-axis voltage feedback signal UdfbkAnd q-axis voltage feedback signal UqfbkThe output quantity is d-axis current given signal Idref1And q-axis current setting signal Iqref1(ii) a d-axis voltage given UqrefAnd d-axis voltage feedback UdfbkIs connected to the input of a d-axis voltage regulator PI5, the q-axis voltage being given UqrefAnd q-axis voltage feedback UqfbkThe difference value of the d-axis current and the d-axis current is connected with the input end of a q-axis voltage regulator PI6, the output end of the d-axis voltage regulator PI5 and the output end of the q-axis voltage regulator PI6 are respectively connected with a d-axis current given signal I of the output end of a voltage control moduledref1And q-axis current setting signal Iqref1Are connected.
The current control module inputs include: second d-axis current set signal Idref2And a second q-axis current setting signal Iqref2And a d-axis current feedback signal I on the AC side of the converter valvedfbkAnd q-axis current feedback signal Iqfbk(ii) a The output signal comprises a d-axis voltage modulation signal VdrefAnd q-axis voltage modulation signal Vqref(ii) a Second d-axis current set signal Idref2And d-axis current feedback signal I on alternating current side of converter valvedfbkThe difference is connected to the input of a d-axis current regulator PI7, and a second q-axis current setting signal Iqref2And q-axis current feedback signal I at alternating current side of converter valveqfbkThe difference is connected with the input end of a q-axis current regulator PI 8; the output signals of the d-axis current regulator PI7 and the q-axis current regulator PI8 and the output d-axis voltage modulation signal V of the current control module respectivelydrefAnd q-axis voltage modulation signal VqrefConnecting; and the d-axis modulation signal and the q-axis modulation signal are converted by a conventional synchronous rotating coordinate-static coordinate to obtain a three-phase control signal of the converter valve.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the converter valve control method, the alternating-current voltage phase of the converter valve is adjusted by utilizing the deviation of active power, and the stability of the converter valve when the converter valve is connected into a weak alternating-current system can be improved without depending on the synchronization of a phase-locked loop and a power grid in the traditional control strategy during steady-state operation.
2. The feedforward control quantity of the power grid current is introduced into the given signal of the current control, the alternating current voltage regulator only outputs the given load current signal, the feedforward current of the power grid is instantly reduced to 0 after the converter valve is disconnected from the power grid, the power imbalance degree of the transient process can be improved in the process of converting from the power grid to an isolated island, and the current impact is reduced.
3. Networking and isolated island control mode switch sets up at the outer loop, and the switching process can avoid the modulation signal sudden change, and switching process and alternating current circuit breaker divide-shut brake position chronogenesis need not strictly cooperate, and power control loop has inertia can keep the stable operation of system in the short time under two kinds of control modes.
Drawings
FIG. 1 is a diagram of a converter valve island and networking control mode switching control method of the present invention;
FIG. 2 is a schematic diagram of an active command switching module of the present invention;
FIG. 3 is a schematic diagram of the reactive command switching module of the present invention;
FIG. 4 is a power control module schematic of the present invention;
FIG. 5 is a schematic diagram of a voltage control module of the present invention;
FIG. 6 is a schematic diagram of a current control module of the present invention.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in FIG. 1, flexible direct current converter valve island and networking mode online smooth switching methods comprise an active instruction switching module, a reactive instruction switching module, a power control module, a voltage control module and a current control module, wherein a second active given signal P at the output end of the active instruction switching moduleref2And a second reactive given signal Q at the output end of the reactive instruction switching moduleref2Respectively connected with power control modulesWork setting input terminal PrefAnd a given reactive input QrefD-axis voltage given signal U at output end of connected power control moduledrefAnd q-axis voltage given signal UqrefConnected with the input end of the voltage control module and used for synchronizing the phase calculation value thetacal d-axis current given signal I connected with the input end of the switching module of the active command and the output end of the voltage control moduledref1And q-axis current setting signal Iqref1Respectively feed forward current I to the gridgdAnd IgqAfter adding, the current is limited by and two, and then is connected with the input end I of the current control moduledref2And Iqref2The current control module outputs the final d-axis and q-axis voltage modulation signals V of the converter valvedrefAnd Vqref。
As shown in FIG. 2, the input quantity of the active command switching module comprises th active given signal Pref1Grid phase thetaPLLSynchronous phase θ of power control module outputcalAnd a control mode signal with an output of a second active power given signal, wherein the control mode signal has two signal values of 0 and 1 and is connected with a control end S of the mode selection switch, when the control end is 0, an output end Out of the mode selection switch is connected with an input end In1 of the mode selection switch, when the control end is 1, the output end Out of the mode selection switch is connected with a second input end In2 of the mode selection switch, an input end In1 of the mode selection switch is connected with an input number active power given signal P of the active power instruction switching moduleref1Connected to each other, a second input terminal In2 of the mode selection switch is connected to the output terminal of the phase adjuster PI1, the grid phase θPLLSynchronous phase theta with power module outputcalThe difference is subjected to sine calculation and sin and then is connected with the input end of a phase regulator PI 1; outputting a second active given signal Pref2Connected with the output end Out of the mode selection switch; the phase adjuster PI1 is a proportional-integral adjuster.
As shown in fig. 3, the input quantities of the reactive instruction switching module include: a.c. voltage amplitude given signal ErefFeedback signal E of amplitude of AC voltagefbk thGiven signal Q of reactive powerref1And a control mode signal; the output quantity is a second reactive given signal Qref2The control mode signal has two signal values of 0 and 1 and is connected with the control end of the mode selection switch, when the control end is 0, the output end Out of the mode selection switch is connected with the th input end In1 of the mode selection switch, when the control end is 1, the output end Out of the mode selection switch is connected with the second input end In2 of the mode selection switch, the th input end In1 of the mode selection switch is connected with the input number reactive given signal Q of the reactive instruction switching moduleref1Connected to the second input terminal In2 of the mode selection switch, and connected to the output terminal of the voltage amplitude regulator PI2, the AC voltage amplitude given signal ErefAnd AC voltage amplitude feedback signal EfbkIs connected with the input end of a voltage amplitude regulator PI 2; outputting a second reactive given signal Qref2Connected with the output end Out of the mode selection switch; the voltage amplitude regulator PI2 is a proportional-integral regulator.
When the control mode signal is 0, the network mode is selected, and when the control mode signal is 1, the island mode is selected.
As shown in fig. 4, the input quantities of the power control module include: active power given signal PrefActive power feedback signal PfbkReactive power given signal QrefReactive power feedback signal Qfbk(ii) a The output quantity comprises: d-axis voltage given signal UdrefQ-axis voltage given signal UqrefAnd the calculated value of the synchronous phase thetacal(ii) a Active power given signal PrefAnd an active power feedback signal PfbkThe difference value is connected with the Kp input end of an active power regulator, and the Kp output end of the active power regulator is connected with the rated angular frequency omega of the power grid0The sum is connected with the input end of the integrator, and the output end of the integrator is thetacalIs connected with the phase input end of the coordinate transformation module; given signal Q of reactive powerrefAnd a reactive power feedback signal QfbkThe difference value of the voltage difference value is connected with the input end of a reactive power regulator PI4, and the output end of the reactive power regulator is connected with the amplitude input end of a Kp-dq coordinate transformation module; kp-dq coordinate transformation is realized from polar coordinates to synchronous rotating coordinatesThe output end of the and the second output end of the Kp-dq coordinate transformation module and the output quantity d-axis voltage given signal U of the power control module respectivelydrefAnd q-axis voltage given signal UqrefConnecting; wherein the active power regulator Kp is a proportional regulator.
As shown in fig. 5, the voltage control module input quantities include: d-axis voltage given signal U output by power control moduledrefAnd q-axis voltage given signal UqrefAnd d-axis voltage feedback signal UdfbkAnd q-axis voltage feedback signal UqfbkThe output quantity is d-axis current given signal Idref1And q-axis current setting signal Iqref1(ii) a d-axis voltage given UqrefAnd d-axis voltage feedback UdfbkIs connected to the input of a d-axis voltage regulator PI5, the q-axis voltage being given UqrefAnd q-axis voltage feedback UqfbkThe difference value of the d-axis current and the d-axis current is connected with the input end of a q-axis voltage regulator PI6, the output end of the d-axis voltage regulator PI5 and the output end of the q-axis voltage regulator PI6 are respectively connected with a d-axis current given signal I of the output end of a voltage control moduledref1And q-axis current setting signal Iqref1Are connected.
As shown in fig. 6, the current control module inputs include: second d-axis current set signal Idref2And a second q-axis current setting signal Iqref2And a d-axis current feedback signal I on the AC side of the converter valvedfbkAnd q-axis current feedback signal Iqfbk(ii) a The output signal comprises a d-axis voltage modulation signal VdrefAnd q-axis voltage modulation signal Vqref(ii) a Second d-axis current set signal Idref2And d-axis current feedback signal I on alternating current side of converter valvedfbkThe difference is connected to the input of a d-axis current regulator PI7, and a second q-axis current setting signal Iqref2And q-axis current feedback signal I at alternating current side of converter valveqfbkThe difference is connected with the input end of a q-axis current regulator PI 8; the output signals of the d-axis current regulator PI7 and the q-axis current regulator PI8 and the output d-axis voltage modulation signal V of the current control module respectivelydrefAnd q-axis voltage modulation signal VqrefConnecting; d-axis and q-axis modulation signals are subjected to conventional synchronous rotating coordinate-static coordinateThe three-phase control signal of the converter valve can be obtained through the conversion.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (6)
- The online smooth switching method of the islanding and networking modes of the flexible direct current converter valves of 1 and types is characterized by comprising an active instruction switching module, a reactive instruction switching module, a power control module, a voltage control module and a current control module, wherein an active given signal P at the output end of the active instruction switching moduleref2And the idle given signal Q of the idle instruction switching module output endref2Respectively connected with the active given input end P of the power control modulerefAnd a given reactive input QrefD-axis voltage given signal U at output end of connected power control moduledrefAnd q-axis voltage given signal UqrefConnected with the input end of the voltage control module and used for synchronizing the phase calculation value thetacal d-axis current given signal I connected with the input end of the switching module of the active command and the output end of the voltage control moduledref1And q-axis current setting signal Iqref1Respectively feed forward current I to the gridgdAnd IgqAfter adding, the current is limited by and two, and then is connected with the input end I of the current control moduledref2And Iqref2The current control module outputs the final d-axis and q-axis voltage modulation signals V of the converter valvedrefAnd Vqref。
- 2. The flexible direct current converter valve island and networking mode online smooth switching method according to claim 1, wherein the input variables of the active command switching module include th active given signal Pref1Grid phase thetaPLLSynchronous phase θ of power control module outputcalAnd a control mode signal; the output quantity is a second active given signal; the control mode signal has 0 and 1Two signal values are connected with a control end S of the mode selection switch, when the control end is 0, an output end Out of the mode selection switch is connected with an input end In1 of a th end of the mode selection switch, when the control end is 1, the output end Out of the mode selection switch is connected with a second input end In2 of the mode selection switch, an input end In1 of an th end of the mode selection switch is connected with an input number P active power given signal P of the active power instruction switching moduleref1Connected to each other, a second input terminal In2 of the mode selection switch is connected to the output terminal of the phase adjuster PI1, the grid phase θPLLSynchronous phase theta with power module outputcalThe difference is subjected to sine calculation and sin and then is connected with the input end of a phase regulator PI 1; outputting a second active given signal Pref2Connected with the output end Out of the mode selection switch; the phase adjuster PI1 is a proportional-integral adjuster.
- 3. The flexible direct current converter valve island and networking mode online smooth switching method according to claim 1, wherein the input quantity of the reactive power command switching module comprises an alternating voltage amplitude given signal ErefFeedback signal E of amplitude of AC voltagefbk th reactive power given signal Qref1And a control mode signal; the output quantity is a second reactive given signal Qref2The control mode signal has two signal values of 0 and 1 and is connected with the control end of the mode selection switch, when the control end is 0, the output end Out of the mode selection switch is connected with the th input end In1 of the mode selection switch, when the control end is 1, the output end Out of the mode selection switch is connected with the second input end In2 of the mode selection switch, the th input end In1 of the mode selection switch is connected with the input number reactive given signal Q of the reactive instruction switching moduleref1Connected to the second input terminal In2 of the mode selection switch, and connected to the output terminal of the voltage amplitude regulator PI2, the AC voltage amplitude given signal ErefAnd AC voltage amplitude feedback signal EfbkIs connected with the input end of a voltage amplitude regulator PI 2; outputting a second reactive given signal Qref2Connected with the output end Out of the mode selection switch; the voltage amplitude regulator PI2 is a ratioExample-integral regulators.
- 4. The flexible direct current converter valve island and networking mode online smooth switching method according to claim 1, wherein the input quantity of the power control module comprises an active power given signal PrefActive power feedback signal PfbkReactive power given signal QrefReactive power feedback signal Qfbk(ii) a The output quantity comprises: d-axis voltage given signal UdrefQ-axis voltage given signal UqrefAnd the calculated value of the synchronous phase thetacal(ii) a Active power given signal PrefAnd an active power feedback signal PfbkThe difference value is connected with the Kp input end of an active power regulator, and the Kp output end of the active power regulator is connected with the rated angular frequency omega of the power grid0The sum is connected with the input end of the integrator, and the output end of the integrator is thetacalIs connected with the phase input end of the coordinate transformation module; given signal Q of reactive powerrefAnd a reactive power feedback signal QfbkThe difference value of the voltage difference value is connected with the input end of a reactive power regulator PI4, the output end of the reactive power regulator is connected with the amplitude input end of a Kp-dq coordinate transformation module, the Kp-dq coordinate transformation realizes the transformation from a polar coordinate to a synchronous rotation coordinate, and the output end and the second output end of the Kp-dq coordinate transformation module are respectively connected with the output quantity d-axis voltage given signal U of the power control moduledrefAnd q-axis voltage given signal UqrefConnecting; wherein the active power regulator Kp is a proportional regulator.
- 5. The flexible direct current converter valve island and networking mode online smooth switching method according to claim 1, wherein the voltage control module input comprises a d-axis voltage given signal U output by a power control moduledrefAnd q-axis voltage given signal UqrefAnd d-axis voltage feedback signal UdfbkAnd q-axis voltage feedback signal UqfbkThe output quantity is d-axis current given signal Idref1And q-axis current setting signal Iqref1(ii) a d-axis voltage given UqrefAnd d-axis voltage feedback UdfbkDifference of (2) and d-axisThe input end of the voltage regulator PI5 is connected, and the q-axis voltage is given by UqrefAnd q-axis voltage feedback UqfbkThe difference value of the d-axis current and the d-axis current is connected with the input end of a q-axis voltage regulator PI6, the output end of the d-axis voltage regulator PI5 and the output end of the q-axis voltage regulator PI6 are respectively connected with a d-axis current given signal I of the output end of a voltage control moduledref1And q-axis current setting signal Iqref1Are connected.
- 6. The flexible direct current converter valve island and networking mode online smooth switching method according to claim 1, wherein the current control module input comprises a second d-axis current given signal Idref2And a second q-axis current setting signal Iqref2And a d-axis current feedback signal I on the AC side of the converter valvedfbkAnd q-axis current feedback signal Iqfbk(ii) a The output signal comprises a d-axis voltage modulation signal VdrefAnd q-axis voltage modulation signal Vqref(ii) a Second d-axis current set signal Idref2And d-axis current feedback signal I on alternating current side of converter valvedfbkThe difference is connected to the input of a d-axis current regulator PI7, and a second q-axis current setting signal Iqref2And q-axis current feedback signal I at alternating current side of converter valveqfbkThe difference is connected with the input end of a q-axis current regulator PI 8; the output signals of the d-axis current regulator PI7 and the q-axis current regulator PI8 and the output d-axis voltage modulation signal V of the current control module respectivelydrefAnd q-axis voltage modulation signal VqrefConnecting; and the d-axis modulation signal and the q-axis modulation signal are converted by a conventional synchronous rotating coordinate-static coordinate to obtain a three-phase control signal of the converter valve.
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| CN113394809A (en) * | 2021-06-24 | 2021-09-14 | 南方电网科学研究院有限责任公司 | Flexible direct current island control method, device and medium based on power grid structure type |
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