CN104300577A - Isolated island operation method of new energy power generation and high-voltage direct-current transmission direct-connection system - Google Patents
Isolated island operation method of new energy power generation and high-voltage direct-current transmission direct-connection system Download PDFInfo
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- CN104300577A CN104300577A CN201410520283.2A CN201410520283A CN104300577A CN 104300577 A CN104300577 A CN 104300577A CN 201410520283 A CN201410520283 A CN 201410520283A CN 104300577 A CN104300577 A CN 104300577A
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Classifications
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- H02J3/382—
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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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- 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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- H02J3/386—
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses an isolated island operation method of a new energy power generation and high-voltage direct-current transmission direct-connection system. A new energy power generation system adopts a mutual synchronization control method to provide voltage and frequency support for a power grid, and a necessary condition is provided for commutation of a traditional high-voltage direct-current transmission system in the isolated island power grid. The stability of voltage amplitude and frequency of a local load can be ensured and electric power of the new energy power generation system can be transmitted to a remote load through mutual synchronization control of the new energy power generation system and mutual matching of traditional high-voltage direct-current transmission controllers. The limitation that at present, the new energy power generation system needs to be connected with a main power grid when transmitting power to the remote load through the traditional high-voltage direct-current transmission system is broken, and stable isolated island operation under the condition that the new energy power generation system and the traditional high-voltage direct-current transmission system are off the main power grid is achieved.
Description
Technical field
The invention belongs to technical field of new energy power generation, more specifically, relate to a kind of islet operation method of generation of electricity by new energy and high voltage direct current transmission direct connection system.
Background technology
Along with global energy shortage and the problem such as environmental pollution become increasingly conspicuous, new forms of energy because of its feature such as clean, safe, efficient, the new industry having become countries in the world common concern and given priority to.The aboundresources such as wind energy and solar energy, widely distributed, be the most potential new forms of energy at present.Along with continually developing of new forms of energy, the new resources construction that exploitation is complete, more concentrated, abundant gradually of the good area of resource distribution will launch in remote districts, gradually as the land construction wind power base in remote districts and photovoltaic base.In China, new forms of energy develop rapidly and have a extensive future, but also there is the problems such as electric network composition construction falls behind.Current planning and the large-scale new forms of energy region built, developing zone concentrated by wind power generation as several more than 5,000,000 kilowatts of Jiuquan, Wulanchabu League of Inner Mongolia, Siklingelei, Tongliao, Chifeng etc., the Large marine such as Along The Coast of Shandong Province, jiangsu coast wind power base, and the large-sized photovoltaic power station such as Tibet, Qinghai, Xinjiang, be all away from the thousands of kilometer of load center except offshore wind farm.The large-scale generation of electricity by new energy area of therefore planning is in electrical network end, and the grid structure of electrical network is weak, and power supply architecture is single, and load capacity is little, require generation of electricity by new energy base can when not having other electrical network to connect distally load center transmission power.
In technology of transmission of electricity, conventional high-tension direct current transportation is the choose reasonable of carrying out extensive remote new forms of energy transmission of electricity.Existing UHV AC transmission technique is difficult to meet following extensive (more than 10GW level) remote (more than 1000km) new forms of energy base electric power and sends requirement.And high voltage direct current transmission does not limit transmission distance in theory, be highly suitable for long distance power transmission.High voltage direct current transmission according to change of current device difference can be divided into based on the line commutation of the thyristor converter element without self-switching-off capability high voltage direct current transmission (LCC-HVDC) and can from the VSC type direct current transportation (VSC-HVDC) of voltage source converter element of shutoff based on full-control type.Although the direct current transportation of VSC type can independently control active power and reactive power, control flexibly, but at present new forms of energy base extensive as China is sent outside to the situation of power, there is transmission capacity little (current experimental project is 2000MW to the maximum), critical defect that cost is high in it, and the loss of converter valve is at present still higher than LCC-HVDC.Since first LCC-HVDC business in 1954 puts into operation, the whole world is existing puts into operation more than more than 90 Traditional DC engineerings.The current engineering of its transmission capacity puts into operation and can reach 8000MW, is applicable to very much the requirement that power is sent in new forms of energy base on a large scale outside.But also there are some defects in it, change of current device needs AC system to provide commutation voltage to realize opening or turning off of change of current device current, commutation period needs electrical network to provide converting commutating current, at this time need AC system to have enough large voltage support ability to maintain the voltage required for Traditional DC transmission of electricity commutation, ensure the reliability of commutation.
There is the defect that cannot depart from electrical network independent operating in current generation of electricity by new energy technology.For wind-driven generator, be all based on electrical network Phase-Locked Synchronous at present, the Current Vector Control strategy of the dq decoupling zero of voltage (or power) outer shroud, current inner loop.Off the net at forceful electric power, this control strategy has that independent regulation is gained merit, the superior function of reactive power.But off the net at light current, the existence and stability problem of this control strategy own.Owing to adopting Phase-Locked Synchronous, be subject to the line voltage of wind-powered electricity generation or other factors disturbance using the input as phase-locked loop and electric current loop, cause blower fan to respond and inhibitory action is not played to grid disturbance, but cause the fluctuation of power output further, have impact on the safety of electrical network and stablize.Phase-Locked Synchronous mode makes wind-driven generator place one's entire reliance upon electrical network, because need mains frequency or phase place as the control benchmark of self, blower fan can be able to not be departed from as synchronous generator carry out starting and independent operating in electrical network, this also causes blower fan directly can not be connected with conventional high-tension DC transmission system running.For other generation of electricity by new energy technology, there is similar problem equally based on existing control.
In sum, the resource special based on China and power load distributing situation, require that generation of electricity by new energy base can when not having other electrical network to connect by conventional high-tension direct current transportation distally load center transmission power; Therefore, generation of electricity by new energy is realized most important with the islet operation of high voltage direct current transmission direct connection system (namely grid-connected power generation system is directly connected when departing from main electrical network with conventional high-tension DC transmission system).
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of islet operation method of generation of electricity by new energy and high voltage direct current transmission direct connection system, broken current grid-connected power generation system by conventional high-tension DC transmission system distally load transmission power time must and the limitation that connects of main electrical network, achieve grid-connected power generation system and the isolated island stable operation when departing from main electrical network of conventional high-tension DC transmission system.
For achieving the above object, the invention provides a kind of islet operation method of generation of electricity by new energy and high voltage direct current transmission direct connection system, it is characterized in that, comprise generation of electricity by new energy and run rate-determining steps, described generation of electricity by new energy runs rate-determining steps and comprises following sub-step:
(A1) gather also current on line side and voltage, calculate active power and the terminal voltage amplitude of the instantaneous output in grid-connected side;
(A2) utilize active power and the active power fiducial value of the instantaneous output in grid-connected side, obtain the exciting voltage electric angle frequency of generation of electricity by new energy unit, and the exciting voltage phase place of generation of electricity by new energy unit is obtained to this exciting voltage electric angle frequency integrator; Utilize terminal voltage amplitude and the terminal voltage magnitude references value of the instantaneous output in grid-connected side, obtain the exciting voltage amplitude of generation of electricity by new energy unit;
(A3) by the exciting voltage phase place of generation of electricity by new energy unit and amplitude synthesis exciting voltage vector, exciting voltage vector according to generation of electricity by new energy unit produces switch modulation signal, control the break-make of the switching device of current transformer in generation of electricity by new energy unit, thus control built-in potential amplitude that generation of electricity by new energy unit exports and phase place, and then realize the control of the power output of grid-connected power generation system and the output end voltage of grid-connected power generation system is stablized.
Preferably, grid-connected power generation system is dual feedback wind power generation system, the exciting voltage electric angle frequency of generation of electricity by new energy unit is the exciting voltage electric angle frequency of double fed induction generators, in described step (A2), the exciting voltage electric angle frequency of generation of electricity by new energy unit obtains by the following method:
(A2-1-1) active power fiducial value is deducted active power and the Damping Power of the instantaneous output in grid-connected side, obtain the active power deviate that double fed induction generators exports;
(A2-1-2) according to the active power deviate that double fed induction generators exports, line voltage electric angle frequency instruction deviate is obtained;
(A2-1-3) line voltage electric angle frequency instruction deviate is added line voltage electric angle frequency instruction fiducial value, then deduct double fed induction generators rotor angular rate, obtain the exciting voltage electric angle frequency of double fed induction generators;
Wherein, Damping Power is obtained by line voltage electric angle frequency instruction deviate.
Preferably, grid-connected power generation system is dual feedback wind power generation system, the exciting voltage amplitude of generation of electricity by new energy unit is the exciting voltage amplitude of double fed induction generators, and in described step (A2), the exciting voltage amplitude of generation of electricity by new energy unit obtains by the following method:
(A2-2-1) terminal voltage magnitude references value is deducted the terminal voltage amplitude of the instantaneous output in grid-connected side, obtain the deviate of the terminal voltage amplitude of the instantaneous output in grid-connected side;
(A2-2-2) according to the deviate of the terminal voltage amplitude of the instantaneous output in grid-connected side, the exciting voltage amplitude of double fed induction generators is obtained.
Preferably, above-mentioned islet operation method also comprises direct current transportation sending end and runs rate-determining steps, and described direct current transportation sending end is run rate-determining steps and comprised following sub-step:
(B1) gather the grid-connected bus terminal voltage of high voltage direct current transmission sending end, calculate grid-connected bus terminal voltage frequency;
(B2) according to grid-connected bus terminal voltage frequency and terminal voltage frequency reference value, trigger angle control signal is produced;
(B3) rectifier of direct current transportation sending end utilizes trigger angle control signal, produce the modulation switch signal controlling its internal switch device break-make, control the direct voltage that rectifier exports, the direct voltage of this direct voltage and DC power transmission line inversion end interacts, obtain direct current, thus realize the stable conveying of direct current transportation power.
Preferably, described step (B2) comprises the steps: further
(B2-1-1) terminal voltage frequency reference value is deducted grid-connected bus terminal voltage frequency, obtain grid-connected bus terminal voltage exemplary frequency deviation values;
(B2-1-2) trigger angle control signal is produced according to grid-connected bus terminal voltage exemplary frequency deviation values.
Preferably, above-mentioned islet operation method also comprises direct current transportation sending end and runs rate-determining steps, and described direct current transportation sending end is run rate-determining steps and comprised following sub-step:
(B1) gather the grid-connected bus terminal voltage of high voltage direct current transmission sending end, calculate grid-connected bus terminal voltage frequency;
(B2) first according to grid-connected bus terminal voltage frequency and terminal voltage frequency reference value, obtain the direct current fiducial value of DC power transmission line, afterwards again according to the direct current fiducial value of DC power transmission line and the DC current measures of DC power transmission line, produce trigger angle control signal;
(B3) rectifier of direct current transportation sending end utilizes trigger angle control signal, produce the modulation switch signal controlling its internal switch device break-make, control the direct voltage that rectifier exports, the direct voltage of this direct voltage and DC power transmission line inversion end interacts, obtain direct current, thus realize the stable conveying of direct current transportation power.
Preferably, described step (B2) comprises the steps: further
(B2-2-1) grid-connected bus terminal voltage frequency is deducted terminal voltage frequency reference value, obtain grid-connected bus terminal voltage exemplary frequency deviation values;
(B2-2-2) the direct current fiducial value of DC power transmission line is produced according to grid-connected bus terminal voltage exemplary frequency deviation values;
(B2-2-3) DC current measures of DC power transmission line is deducted the direct current fiducial value of DC power transmission line, obtain the direct current deviate of DC power transmission line;
(B2-2-4) trigger angle control signal is produced according to the direct current deviate of DC power transmission line.
Preferably, above-mentioned islet operation method also comprises local load UFLS rate-determining steps, and described local load UFLS rate-determining steps comprises following sub-step:
(C1) gather the grid-connected bus terminal voltage of high voltage direct current transmission, calculate grid-connected bus terminal voltage frequency;
(C2) the minimum voltage frequency reference value utilizing grid-connected bus terminal voltage frequency and allow island-grid to run, produces UFLS control signal;
(C3) local load break switch is according to this UFLS control signal, judges whether the local load of cut-out, to prevent island-grid underfrequency, damages transmission of electricity and power consumption equipment.
In general, the above technical scheme conceived by the present invention compared with prior art, there is following beneficial effect: grid-connected power generation system adopts mutually synchronization control method to provide voltage and frequency to support, for conventional high-tension DC transmission system provides necessary condition in the commutation of island-grid for island-grid.Controlled and the cooperatively interacting of conventional high-tension DC transmission controller by grid-connected power generation system mutually synchronization, the voltage magnitude of local load and the stable of frequency can be ensured, and the electrical power that grid-connected power generation system can be sent distally load conveying.The present invention broken current grid-connected power generation system by conventional high-tension DC transmission system distally load transmission power time must and the limitation that connects of main electrical network, achieve grid-connected power generation system and the isolated island stable operation when departing from main electrical network of conventional high-tension DC transmission system.
Accompanying drawing explanation
Fig. 1 is the generation of electricity by new energy of the embodiment of the present invention and the structural representation of high voltage direct current transmission direct connection system;
Fig. 2 is the principle schematic of mutually synchronization controller;
Fig. 3 is the principle schematic of high voltage direct current sending end controller;
Fig. 4 is that generation of electricity by new energy runs control flow chart;
Fig. 5 is that direct current transportation sending end runs control flow chart;
Fig. 6 is local load UFLS control flow chart;
Fig. 7 is the structural representation of dual feedback wind power generation system;
Fig. 8 is the principle schematic of interior frequency controller in dual feedback wind power generation system;
Fig. 9 is the principle schematic of field regulator in dual feedback wind power generation system.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
As shown in Figure 1, the generation of electricity by new energy of the embodiment of the present invention and high voltage direct current transmission direct connection system comprise grid-connected power generation system and HVDC (High Voltage Direct Current) transmission system.Grid-connected power generation system is connected in parallel on the ac bus B1 in HVDC (High Voltage Direct Current) transmission system by line impedance Z1 and circuit breaker S2, filtering and reactive power compensator and local load are connected in parallel on ac bus B1 respectively by circuit breaker S1 and S3.The receiving end outlet of HVDC (High Voltage Direct Current) transmission system is connected with AC system S by line impedance Z2.
Grid-connected power generation system comprises new forms of energy power unit (as wind energy conversion system, solar photovoltaic cell panel etc.), generation of electricity by new energy unit (as wind-driven generator, photovoltaic DC-to-AC converter etc.), step-up transformer T0 and master controller.Master controller comprises computing module, mutually synchronization controller and PWM generator for calculating instantaneous active power and voltage magnitude further.Computing module collection current on line side and voltage, calculate active power and the terminal voltage amplitude of the instantaneous output in grid-connected side.The active power fiducial value that mutually synchronization controller utilizes the active power of the instantaneous output in grid-connected side and new forms of energy power unit to export, obtains the exciting voltage phase place of generation of electricity by new energy unit; In addition, mutually synchronization controller also utilizes terminal voltage amplitude and the terminal voltage magnitude references value (by also site rated voltage decision) of the instantaneous output in grid-connected side, obtains the exciting voltage amplitude of generation of electricity by new energy unit.PWM generator by the exciting voltage phase place of generation of electricity by new energy unit and amplitude synthesis exciting voltage vector, and produces switch modulation signal by space vector modulation or other modulation system; The built-in potential amplitude that this switch modulation signal controlling generation of electricity by new energy unit exports and phase place, thus realize the control of the power output of grid-connected power generation system and the output end voltage of grid-connected power generation system is stablized.
HVDC (High Voltage Direct Current) transmission system comprises rectifier, high voltage direct current sending end controller, inverter, high voltage direct current by side controller and measurement module.Rectifier is connected by DC power transmission line with inverter, the other end of rectifier is connected ac bus B1 by converter transformer T1 with circuit breaker S4 successively, the other end of inverter is connected ac bus B2 by converter transformer T2 with circuit breaker S5 successively, and the filtering be connected with ac bus B2 and the reactive power compensator of high voltage direct current transmission configuration omit not shown.High voltage direct current adopts conventional constant DC voltage control method by side controller, makes the DC voltage stability of DC power transmission line inversion end at rated value, repeats no more here.Measurement module gathers the grid-connected bus terminal voltage of high voltage direct current transmission sending end, calculates grid-connected bus terminal voltage frequency.High voltage direct current sending end controller is according to grid-connected bus terminal voltage frequency and terminal voltage frequency reference value (being generally 50Hz), produce trigger angle control signal, or high voltage direct current sending end controller is first according to grid-connected bus terminal voltage frequency and terminal voltage frequency reference value, obtain the direct current fiducial value of DC power transmission line, afterwards again according to the direct current fiducial value of DC power transmission line and the DC current measures of DC power transmission line, produce trigger angle control signal.Rectifier utilizes trigger angle control signal, produce the modulation switch signal controlling its internal switch device break-make, control the direct voltage that rectifier exports, the direct voltage of this direct voltage and DC power transmission line inversion end interacts, obtain direct current, thus realize the stable conveying of direct current transportation power.
The grid-connected bus terminal voltage frequency that UFLS controller exports according to measurement module and the minimum voltage frequency reference value that predetermined permission island-grid runs (determining the requirement of low-limit frequency according to local load running safety), produce UFLS control signal.When underload circuit breaker is according to this UFLS control signal, judge whether the local load of cut-out, to prevent island-grid underfrequency, damage transmission of electricity and power consumption equipment.
Finally, the power sum that the power output of grid-connected power generation system and the power of local load consumption and DC transmission system are sent balances, and ensure electric voltage frequency and the amplitude stability of island-grid, achieve the isolated island stable operation of generation of electricity by new energy and high voltage direct current transmission direct connection system.
As shown in Figure 2, mutually synchronization controller comprises interior frequency controller, integrator and field regulator further.The active power fiducial value that interior frequency controller utilizes the active power of the instantaneous output in grid-connected side and new forms of energy power unit to export, obtain the exciting voltage electric angle frequency of generation of electricity by new energy unit, integrator obtains the exciting voltage phase place of generation of electricity by new energy unit to this exciting voltage electric angle frequency integrator; Field regulator utilizes terminal voltage amplitude and the terminal voltage magnitude references value of the instantaneous output in grid-connected side, obtains the exciting voltage amplitude of generation of electricity by new energy unit.
Particularly, interior frequency controller can be the controller of integrator, PI controller, adaptive controller or other arbitrary form.The parameter of interior frequency controller determines the built-in potential inertia size of generation of electricity by new energy unit generation.Field regulator can be the controller of integrator, PI controller, adaptive controller or other arbitrary form.
High voltage direct current sending end controller can be the controller of integrator, PI controller, adaptive controller or other arbitrary form, and it controls object is make interchange terminal voltage frequency-invariant, instead of makes direct current or direct current transportation power invariability.As shown in Fig. 3 (a), in one embodiment of the invention, high voltage direct current sending end controller comprises adder 31 and frequency controller.Predetermined terminal voltage frequency reference value is deducted grid-connected bus terminal voltage frequency by adder 31, obtains grid-connected bus terminal voltage exemplary frequency deviation values; Frequency controller produces trigger angle control signal according to grid-connected bus terminal voltage exemplary frequency deviation values.Wherein, frequency controller can be simple PI controller, also can be comparatively complicated adaptive controller or the controller of other type.
As shown in Fig. 3 (b), in another embodiment of the present invention, high voltage direct current sending end controller comprises adder 32, frequency controller, adder 33 and direct current controller.Predetermined terminal voltage frequency reference value is deducted grid-connected bus terminal voltage frequency by adder 32, obtains grid-connected bus terminal voltage exemplary frequency deviation values; Frequency controller produces the direct current fiducial value of DC power transmission line according to grid-connected bus terminal voltage exemplary frequency deviation values; The DC current measures of DC power transmission line is deducted the direct current fiducial value of DC power transmission line by adder 33, obtains the direct current deviate of DC power transmission line; Direct current controller produces trigger angle control signal according to the direct current deviate of DC power transmission line.The dynamic process of the direct current of DC power transmission line is fed back to control ring by the program, fast to the response of DC side.Wherein, frequency controller and direct current controller can be simple PI controllers, also can be comparatively complicated adaptive controller or the controller of other type.
The generation of electricity by new energy of the embodiment of the present invention and the islet operation method of high voltage direct current transmission direct connection system comprise generation of electricity by new energy run control, direct current transportation sending end runs and to control and local load UFLS controls three steps, the active power sum that the active power jointly making new forms of energy send and the active power of local load consumption and HVDC (High Voltage Direct Current) transmission system are sent keeps balancing, thus makes the voltage of island-grid and frequency keep stable.
As shown in Figure 4, generation of electricity by new energy operation rate-determining steps comprises following sub-step:
(A1) gather also current on line side and voltage, calculate active power and the terminal voltage amplitude of the instantaneous output in grid-connected side.
(A2) utilize active power and the active power fiducial value of the instantaneous output in grid-connected side, obtain the exciting voltage electric angle frequency of generation of electricity by new energy unit, and the exciting voltage phase place of generation of electricity by new energy unit is obtained to this exciting voltage electric angle frequency integrator; Utilize terminal voltage amplitude and the terminal voltage magnitude references value of the instantaneous output in grid-connected side, obtain the exciting voltage amplitude of generation of electricity by new energy unit.
When grid-connected power generation system is dual feedback wind power generation system, the exciting voltage electric angle frequency of generation of electricity by new energy unit is the exciting voltage electric angle frequency of DFIG, obtains the exciting voltage electric angle frequency of DFIG especially by following method:
(A2-1-1) active power fiducial value is deducted active power and the Damping Power of the instantaneous output in grid-connected side, obtain the active power deviate that DFIG exports.
(A2-1-2) according to the active power deviate that DFIG exports, line voltage electric angle frequency instruction deviate is obtained.
(A2-1-3) line voltage electric angle frequency instruction deviate is added line voltage electric angle frequency instruction fiducial value (usually being determined by line voltage frequency), then deduct DFIG rotor angular rate, obtain the exciting voltage electric angle frequency of DFIG.
Wherein, Damping Power is obtained by line voltage electric angle frequency instruction deviate.
When grid-connected power generation system is dual feedback wind power generation system, the exciting voltage amplitude of generation of electricity by new energy unit is the exciting voltage amplitude of DFIG, obtains the exciting voltage amplitude of DFIG especially by following method:
(A2-2-1) terminal voltage magnitude references value is deducted the terminal voltage amplitude of the instantaneous output in grid-connected side, obtain the deviate of the terminal voltage amplitude of the instantaneous output in grid-connected side.
(A2-2-2) according to the deviate of the terminal voltage amplitude of the instantaneous output in grid-connected side, the exciting voltage amplitude of DFIG is obtained.
(A3) by the exciting voltage phase place of generation of electricity by new energy unit and amplitude synthesis exciting voltage vector, exciting voltage vector according to generation of electricity by new energy unit produces switch modulation signal, control the break-make of the switching device of current transformer in generation of electricity by new energy unit, thus control built-in potential amplitude that generation of electricity by new energy unit exports and phase place, and then realize the control of the power output of grid-connected power generation system and the output end voltage of grid-connected power generation system is stablized.
As shown in Figure 5, direct current transportation sending end is run rate-determining steps and is comprised following sub-step:
(B1) gather the grid-connected bus terminal voltage of high voltage direct current transmission sending end, calculate grid-connected bus terminal voltage frequency.
(B2) according to grid-connected bus terminal voltage frequency and terminal voltage frequency reference value, trigger angle control signal is produced; Or first according to grid-connected bus terminal voltage frequency and terminal voltage frequency reference value, obtain the direct current fiducial value of DC power transmission line, afterwards again according to the direct current fiducial value of DC power transmission line and the DC current measures of DC power transmission line, produce trigger angle control signal.
Wherein, the former comprises the steps: further
(B2-1-1) terminal voltage frequency reference value is deducted grid-connected bus terminal voltage frequency, obtain grid-connected bus terminal voltage exemplary frequency deviation values.
(B2-1-2) trigger angle control signal is produced according to grid-connected bus terminal voltage exemplary frequency deviation values.
The latter comprises the steps: further
(B2-2-1) grid-connected bus terminal voltage frequency is deducted terminal voltage frequency reference value, obtain grid-connected bus terminal voltage exemplary frequency deviation values.
(B2-2-2) the direct current fiducial value of DC power transmission line is produced according to grid-connected bus terminal voltage exemplary frequency deviation values.
(B2-2-3) DC current measures of DC power transmission line is deducted the direct current fiducial value of DC power transmission line, obtain the direct current deviate of DC power transmission line.
(B2-2-4) trigger angle control signal is produced according to the direct current deviate of DC power transmission line.
(B3) rectifier of direct current transportation sending end utilizes trigger angle control signal, produce the modulation switch signal controlling its internal switch device break-make, control the direct voltage that rectifier exports, the direct voltage of this direct voltage and DC power transmission line inversion end interacts, obtain direct current, thus realize the stable conveying of direct current transportation power.
As shown in Figure 6, local load UFLS rate-determining steps comprises following sub-step:
(C1) gather the grid-connected bus terminal voltage of high voltage direct current transmission, calculate grid-connected bus terminal voltage frequency.
(C2) the minimum voltage frequency reference value utilizing grid-connected bus terminal voltage frequency and allow island-grid to run, produces UFLS control signal.
(C3) local load break switch is according to this UFLS control signal, judges whether the local load of cut-out, to prevent island-grid underfrequency, damages transmission of electricity and power consumption equipment.
The present invention is understood better for making those skilled in the art, below for the islanded system that dual feedback wind power generation system and HVDC (High Voltage Direct Current) transmission system direct connection form, the islet operation method of generation of electricity by new energy of the present invention and high voltage direct current transmission direct connection system is described in detail.
Grid-connected power generation system is specially dual feedback wind power generation system.As shown in Figure 7, dual feedback wind power generation system comprises wind energy conversion system, axle and gearbox drive system, double fed induction generators (Double Fed Induction Generator, DFIG) and master controller.DFIG stator is directly connected with electrical network, and rotor is connected with electrical network with net side converter by rotor-side converter successively, and rotor-side converter is connected by dc-link capacitance with net side converter.Master controller comprises computing module, mutually synchronization controller, PWM generator and DC voltage controller for calculating instantaneous active power and voltage magnitude.Mutually synchronization controller comprises interior frequency controller, integrator and field regulator.
DC voltage controller adopts conventional DC voltage control method, makes the direct voltage of dc-link capacitance keep stable, and ensures that three-phase inversion electric current and voltage is sinusoidal waveform, repeat no more here.Computing module collection current on line side and voltage, calculate active power and the terminal voltage amplitude of the actual output in grid-connected side.
As shown in Figure 8, in interior frequency controller, active power fiducial value is deducted active power and the Damping Power of the instantaneous output in grid-connected side by adder 81, obtains the active power deviate that DFIG exports; The active power deviate that controller exports according to DFIG, obtains line voltage electric angle frequency instruction deviate; Line voltage electric angle frequency instruction deviate is added line voltage electric angle frequency instruction fiducial value (usually being determined by line voltage frequency) by adder 82, the output of adder 82 is deducted DFIG rotor angular rate by adder 83, obtains the exciting voltage electric angle frequency of DFIG.Wherein, the line voltage electric angle frequency instruction deviate that Damping Power is exported according to controller by damper obtains.
Integrator obtains the exciting voltage phase place of DFIG to this exciting voltage electric angle frequency integrator.
As shown in Figure 9, in field regulator, terminal voltage magnitude references value is deducted the terminal voltage amplitude of the instantaneous output in grid-connected side by adder 91, obtains the deviate of the terminal voltage amplitude of the instantaneous output in grid-connected side; Voltage controller, according to the deviate of the terminal voltage amplitude of the instantaneous output in grid-connected side, obtains the exciting voltage amplitude of DFIG.
PWM generator by the exciting voltage phase place of DFIG and amplitude synthesis exciting voltage vector, and produces switch modulation signal by space vector modulation or other modulation system; This switch modulation signal exports rotor-side converter to, control the rotor voltage vector that rotor-side converter exports, and then the built-in potential amplitude that exports of control DFIG and phase place, thus realize the control of the power output of dual feedback wind power generation system and the output end voltage of dual feedback wind power generation system is stablized.
By above-mentioned steps, make dual feedback wind power generation system not need phase-locked loop detection of grid frequency or phase place to control benchmark as self, thus avoid the instability problem caused without phase-locked loop under electrical network.The dual feedback wind power generation system adopting mutually synchronization to control externally shows as the form of amplitude, frequency controlled voltage source, for electrical network provides stronger voltage support, increase grid short circuit capacity, necessary commutation voltage and electric current can be provided, for islet operation provides necessary condition for conventional high-tension direct current transportation commutation.Simultaneously, mutually synchronization controls to make dual feedback wind power generation system effectively utilize the inertia of self, ensure that island-grid dynamic frequency is stablized, and ensure that the static frequency of island-grid is stablized by Traditional DC transmission of electricity, ensure that the power that dual feedback wind power generation system exports can stably be transported to distant place load.In addition, the power of transmitting electricity to prevent dual feedback wind power generation system is too low, do not meet the local load operation requirement of island-grid, and the UFLS control for local configuration of load, for the safe operation of island-grid provides safeguard.
The islet operation method of the generation of electricity by new energy that the present invention proposes and high voltage direct current transmission direct connection system, except being applied to except wind-driven generator, can be applicable to other energy power field controlled based on voltage source converter equally, as solar energy power generating, and other comprises system or the device of voltage-source type grid-connected converter, comprise the band grid-connected converter apparatus, flexible DC power transmission inversion end etc. of energy storage and the situation of conventional high-tension DC rectifier end direct connection.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. an islet operation method for generation of electricity by new energy and high voltage direct current transmission direct connection system, is characterized in that, comprises generation of electricity by new energy and runs rate-determining steps, and described generation of electricity by new energy runs rate-determining steps and comprises following sub-step:
(A1) gather also current on line side and voltage, calculate active power and the terminal voltage amplitude of the instantaneous output in grid-connected side;
(A2) utilize active power and the active power fiducial value of the instantaneous output in grid-connected side, obtain the exciting voltage electric angle frequency of generation of electricity by new energy unit, and the exciting voltage phase place of generation of electricity by new energy unit is obtained to this exciting voltage electric angle frequency integrator; Utilize terminal voltage amplitude and the terminal voltage magnitude references value of the instantaneous output in grid-connected side, obtain the exciting voltage amplitude of generation of electricity by new energy unit;
(A3) by the exciting voltage phase place of generation of electricity by new energy unit and amplitude synthesis exciting voltage vector, exciting voltage vector according to generation of electricity by new energy unit produces switch modulation signal, control the break-make of the switching device of current transformer in generation of electricity by new energy unit, thus control built-in potential amplitude that generation of electricity by new energy unit exports and phase place, and then realize the control of the power output of grid-connected power generation system and the output end voltage of grid-connected power generation system is stablized.
2. the islet operation method of generation of electricity by new energy as claimed in claim 1 and high voltage direct current transmission direct connection system, it is characterized in that, grid-connected power generation system is dual feedback wind power generation system, the exciting voltage electric angle frequency of generation of electricity by new energy unit is the exciting voltage electric angle frequency of double fed induction generators, in described step (A2), the exciting voltage electric angle frequency of generation of electricity by new energy unit obtains by the following method:
(A2-1-1) active power fiducial value is deducted active power and the Damping Power of the instantaneous output in grid-connected side, obtain the active power deviate that double fed induction generators exports;
(A2-1-2) according to the active power deviate that double fed induction generators exports, line voltage electric angle frequency instruction deviate is obtained;
(A2-1-3) line voltage electric angle frequency instruction deviate is added line voltage electric angle frequency instruction fiducial value, then deduct double fed induction generators rotor angular rate, obtain the exciting voltage electric angle frequency of double fed induction generators;
Wherein, Damping Power is obtained by line voltage electric angle frequency instruction deviate.
3. the islet operation method of generation of electricity by new energy as claimed in claim 1 and high voltage direct current transmission direct connection system, it is characterized in that, grid-connected power generation system is dual feedback wind power generation system, the exciting voltage amplitude of generation of electricity by new energy unit is the exciting voltage amplitude of double fed induction generators, in described step (A2), the exciting voltage amplitude of generation of electricity by new energy unit obtains by the following method:
(A2-2-1) terminal voltage magnitude references value is deducted the terminal voltage amplitude of the instantaneous output in grid-connected side, obtain the deviate of the terminal voltage amplitude of the instantaneous output in grid-connected side;
(A2-2-2) according to the deviate of the terminal voltage amplitude of the instantaneous output in grid-connected side, the exciting voltage amplitude of double fed induction generators is obtained.
4. the islet operation method of generation of electricity by new energy as claimed any one in claims 1 to 3 and high voltage direct current transmission direct connection system, it is characterized in that, also comprise direct current transportation sending end and run rate-determining steps, described direct current transportation sending end is run rate-determining steps and is comprised following sub-step:
(B1) gather the grid-connected bus terminal voltage of high voltage direct current transmission sending end, calculate grid-connected bus terminal voltage frequency;
(B2) according to grid-connected bus terminal voltage frequency and terminal voltage frequency reference value, trigger angle control signal is produced;
(B3) rectifier of direct current transportation sending end utilizes trigger angle control signal, produce the modulation switch signal controlling its internal switch device break-make, control the direct voltage that rectifier exports, the direct voltage of this direct voltage and DC power transmission line inversion end interacts, obtain direct current, thus realize the stable conveying of direct current transportation power.
5. the islet operation method of generation of electricity by new energy as claimed in claim 4 and high voltage direct current transmission direct connection system, it is characterized in that, described step (B2) comprises the steps: further
(B2-1-1) terminal voltage frequency reference value is deducted grid-connected bus terminal voltage frequency, obtain grid-connected bus terminal voltage exemplary frequency deviation values;
(B2-1-2) trigger angle control signal is produced according to grid-connected bus terminal voltage exemplary frequency deviation values.
6. the islet operation method of generation of electricity by new energy as claimed any one in claims 1 to 3 and high voltage direct current transmission direct connection system, it is characterized in that, also comprise direct current transportation sending end and run rate-determining steps, described direct current transportation sending end is run rate-determining steps and is comprised following sub-step:
(B1) gather the grid-connected bus terminal voltage of high voltage direct current transmission sending end, calculate grid-connected bus terminal voltage frequency;
(B2) first according to grid-connected bus terminal voltage frequency and terminal voltage frequency reference value, obtain the direct current fiducial value of DC power transmission line, afterwards again according to the direct current fiducial value of DC power transmission line and the DC current measures of DC power transmission line, produce trigger angle control signal;
(B3) rectifier of direct current transportation sending end utilizes trigger angle control signal, produce the modulation switch signal controlling its internal switch device break-make, control the direct voltage that rectifier exports, the direct voltage of this direct voltage and DC power transmission line inversion end interacts, obtain direct current, thus realize the stable conveying of direct current transportation power.
7. the islet operation method of generation of electricity by new energy as claimed in claim 6 and high voltage direct current transmission direct connection system, it is characterized in that, described step (B2) comprises the steps: further
(B2-2-1) grid-connected bus terminal voltage frequency is deducted terminal voltage frequency reference value, obtain grid-connected bus terminal voltage exemplary frequency deviation values;
(B2-2-2) the direct current fiducial value of DC power transmission line is produced according to grid-connected bus terminal voltage exemplary frequency deviation values;
(B2-2-3) DC current measures of DC power transmission line is deducted the direct current fiducial value of DC power transmission line, obtain the direct current deviate of DC power transmission line;
(B2-2-4) trigger angle control signal is produced according to the direct current deviate of DC power transmission line.
8. the islet operation method of the generation of electricity by new energy according to any one of claim 1 to 7 and high voltage direct current transmission direct connection system, it is characterized in that, also comprise local load UFLS rate-determining steps, described local load UFLS rate-determining steps comprises following sub-step:
(C1) gather the grid-connected bus terminal voltage of high voltage direct current transmission, calculate grid-connected bus terminal voltage frequency;
(C2) the minimum voltage frequency reference value utilizing grid-connected bus terminal voltage frequency and allow island-grid to run, produces UFLS control signal;
(C3) local load break switch is according to this UFLS control signal, judges whether the local load of cut-out, to prevent island-grid underfrequency, damages transmission of electricity and power consumption equipment.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451563A (en) * | 2016-11-30 | 2017-02-22 | 中广核工程有限公司 | Concurrent grid-connection method and equipment of islanding mode nuclear power plant generator |
| CN107181274A (en) * | 2017-05-24 | 2017-09-19 | 南京南瑞继保电气有限公司 | A kind of method that new energy accesses flexible direct current power network |
| CN108110799A (en) * | 2018-01-30 | 2018-06-01 | 国家电网公司 | The grid-connected virtual synchronous control method and device of isolated island double-fed fan motor field high voltage direct current |
| CN108344902A (en) * | 2017-10-24 | 2018-07-31 | 广东电网有限责任公司汕头供电局 | Dead electricity judgment method and device in face of the flexible DC power transmission device for transporting inspection personnel |
| CN113629773A (en) * | 2021-09-09 | 2021-11-09 | 南方电网科学研究院有限责任公司 | Wind power generation system and power generation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259475A (en) * | 2013-04-22 | 2013-08-21 | 华中科技大学 | Doubly fed induction generator internal frequency synchronization method and device based on power balance |
| CN103337877A (en) * | 2013-06-26 | 2013-10-02 | 华中科技大学 | Direct-current voltage control unit and method for wind power generation system |
| US20140210263A1 (en) * | 2013-01-28 | 2014-07-31 | Hon Hai Precision Industry Co., Ltd. | Data center and power supply system thereof |
-
2014
- 2014-09-29 CN CN201410520283.2A patent/CN104300577B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140210263A1 (en) * | 2013-01-28 | 2014-07-31 | Hon Hai Precision Industry Co., Ltd. | Data center and power supply system thereof |
| CN103259475A (en) * | 2013-04-22 | 2013-08-21 | 华中科技大学 | Doubly fed induction generator internal frequency synchronization method and device based on power balance |
| CN103337877A (en) * | 2013-06-26 | 2013-10-02 | 华中科技大学 | Direct-current voltage control unit and method for wind power generation system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451563A (en) * | 2016-11-30 | 2017-02-22 | 中广核工程有限公司 | Concurrent grid-connection method and equipment of islanding mode nuclear power plant generator |
| CN106451563B (en) * | 2016-11-30 | 2019-03-29 | 中广核工程有限公司 | Simultaneous interconnecting operating method and device under generator of nuclear power station decoupled mode |
| CN107181274A (en) * | 2017-05-24 | 2017-09-19 | 南京南瑞继保电气有限公司 | A kind of method that new energy accesses flexible direct current power network |
| CN108344902A (en) * | 2017-10-24 | 2018-07-31 | 广东电网有限责任公司汕头供电局 | Dead electricity judgment method and device in face of the flexible DC power transmission device for transporting inspection personnel |
| CN108110799A (en) * | 2018-01-30 | 2018-06-01 | 国家电网公司 | The grid-connected virtual synchronous control method and device of isolated island double-fed fan motor field high voltage direct current |
| CN108110799B (en) * | 2018-01-30 | 2020-06-30 | 国家电网公司 | Virtual synchronous control method and device for high-voltage direct current grid connection of island double-fed wind power plant |
| CN113629773A (en) * | 2021-09-09 | 2021-11-09 | 南方电网科学研究院有限责任公司 | Wind power generation system and power generation method thereof |
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