CN109921461A - The evaluation of virtual synchronous generator primary frequency modulation performance and Parameter Optimization System - Google Patents
The evaluation of virtual synchronous generator primary frequency modulation performance and Parameter Optimization System Download PDFInfo
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Abstract
The invention discloses a kind of virtual synchronous generator primary frequency modulation performance on-line evaluations and Parameter Optimization System that belong to distributed power generation applied technical field.The system comprises the following modules: (1) parameter online acquisition module, (2) error-tested module, (3) locking module of steady operation, (4) operating mode determination module, (5) transmission function module, (6) damping state determination module, (7) pull-type inverse transform block, (8) time-domain power variation prediction module, (9) derivative module, (10) integration module, (11) power variation rate module, (12) energy variation prediction module, (13) it is expected power peak module, (14) maximum frequency modulated time module, (15) power contrast's module, (16) time contrast module, (17) parameter optimization module.The present invention can complete the frequency modulation performance and the synthesis on-line evaluation of frequency modulation power output time of photovoltaic, wind-powered electricity generation, energy storage distributed power generation virtual synchronous generator, and can complete to distribute the cores control parameters such as virtual synchronous generator inertia, damping, power control, voltage and current control rationally.This system will substantially reduce the workload of virtual synchronous generator daily maintenance and delivery receiving acceptance, be conducive to a wide range of popularization and application of virtual synchronous generator techniques.
Description
Technical field
The invention belongs to distributed generation technology field more particularly to a kind of virtual synchronous generator responds mains frequency waves
The virtual synchronous generator primary frequency modulation performance on-line evaluation and Parameter Optimization System of kinetic force.
Background technique
As energy shortage and environmental degradation problem highlight in global range, distributed power generation (distributed
Generator, DG) because its environmental protection, sustainable characteristic are increasingly subject to the attention of people, a large amount of renewable energy starts to connect
Enter power grid.However, different from traditional Synchronous generator, photovoltaic power generation does not have rotary unit, and no normal direction system provides inertia
Support, the rotary unit of wind-power electricity generation can only store a small amount of kinetic energy, can not also provide for system and stablize effective inertia branch
Support.With the continuous improvement of DG permeability, synchronous generator installed capacity ratio is constantly reduced in electric system, system towards
Low inertia, low resistance direction develop, this proposes stern challenge to the operation and control of electric system.Contain height to improve
The damping of the power grid of permeability DG and inertia, improve the stability of electric system, and lot of domestic and foreign scholar proposes virtual synchronous
The concept of generator (virtual synchronous generator, VSG) passes through the rotor fortune of simulation synchronous generator
The control strategy of dynamic equation and electromagnetic equation design DG gird-connected inverter, so that inverter has the outer of synchronous generator
Characteristic.VSG topological structure is as shown in Figure 1.
VSG technology simulates the variation of conventional synchronization generator amature kinetic energy with the charge and discharge of DC side energy-storage system,
Power curve is related with the frequency fluctuation situation of the parameters of VSG and power grid；The capacity and power configuration of energy-storage units are then determined
Can determine VSG realize expected frequency modulation function and its maximum time for participating in primary frequency modulation.In recent years, domestic and foreign scholars master
It is conceived to the control strategy of VSG, it is relatively fewer to VSG frequency modulation function on-line monitoring and the research of evaluation.Some scholars derive
VSG energy-storage units go out force-responsive when new energy goes out fluctuation or mains frequency fluctuation, without reference to primary frequency modulation process.
There are also some researchers to analyze the relationship between the power output of energy-storage units and the virtual inertia of VSG, but does not all provide VSG
The rational evaluation method of capacity.And with the appearance of VSG adaptation mechanism, the parameter in VSG operational process is no longer solid
Fixed, disposable off-line calculation has been not enough to make accurate evaluation to VSG function.
Summary of the invention
The present invention has built a kind of real-time VSG primary frequency modulation performance on-line evaluation and Parameter Optimization System, for monitoring
Can VSG capacity meet expected curve and VSG participates in the time limit value of primary frequency modulation, and be based on evaluation result pair
Control parameter optimizes.Configuration for VSG parameter on-line tuning and energy-storage units provides foundation.Of the invention whole group
At as shown in Figure 1, entire evaluation system is made of following 17 modules: parameter online acquisition module, error-tested module, steady
The locking module of state work, operating mode determination module, transmission function module, damping state determination module, pull-type contravariant mold changing
Block, time-domain power variation prediction module, derivative module, integration module, power variation rate module, energy variation prediction module, phase
Hope power peak module, maximum frequency modulated time module, power contrast's module, time contrast module and parameter optimization module.Below
The function and working principle of each module is discussed in detail.
1. parameter online acquisition module.The module is used to acquire the parameter of three parts: (1) ginseng of route and force device
Number mainly includes filter reactance, energy-storage units maximum power, energy-storage units residue charge/discharge capacity；(2) fortune of power grid and VSG
Row parameter mainly includes network voltage, power grid current frequency and frequency difference, VSG built-in potential and generator rotor angle, the active reference value of VSG output
And idle reference value: (3) VSG control parameter mainly includes time constant, damped coefficient D, primary frequency modulation coefficient and VSG specified
Capacity.The module for acquiring power grid and the operating parameter and control parameter of VSG, including filter reactance, energy-storage units state,
Network voltage, mains frequency, VSG built-in potential and generator rotor angle, VSG export active reference value and idle reference value, time constant, resistance
Buddhist nun's coefficient, primary frequency modulation coefficient etc.；
2. error-tested module.Whether the module is responsible for the parameter collected of inspection module 1 accurate, if acquisition data exceed
Preset range then needs to resurvey.
3. steady operation point module.The module is connected with error-tested module, for locking the steady operation point of VSG.
4. operating mode determination module.The data that the module receiving module (3) transmits, for determining the operating mode of VSG.
Mains frequency is not prescribed a time limit more, and VSG works in normal mode, and VSG output power is equal to the power that new energy side issues, energy storage
Unit is not contributed.Mains frequency is more prescribed a time limit, and VSG works in primary frequency modulation mode, and energy-storage units response frequency is fluctuated and contributed.
5. transmission function module.The module decides whether to carry out transmitting letter according to the judgement result of operating mode determination module
Several foundation, under primary frequency modulation mode, the fluctuation of energy-storage units response frequency and the transmission function contributed are as follows:
Wherein * indicates that per unit value, Δ f are frequency difference,For energy-storage units power output, H is time constant, ω0For synchro angle
Frequency, SEFor synchronizing power, D is damped coefficient, KfFor primary frequency modulation coefficient.
6. damping state determination module.The characteristic equation for the transmission function that the module is used to be established by a upper module,
The damping situation for judging VSG system, is generally divided into three kinds of overdamp, underdamping, critical damping states, the module it is specific in
Hold as shown in Figure 2.
7. pull-type inverse transform block.The module is used to carry out reverse drawing Laplace transform to the transmission function established in module 5.
8. time-domain power prediction module.The module be used for according in module 7 reverse drawing Laplace transform as a result, establishing power grid
The mathematical model that energy-storage units output power changes over time when frequency fluctuation.
9. differentiation element.The module is used to carry out differential process to the power time domain variation model of energy-storage units.
10. integral element.The module is used to carry out Integral Processing to the power time domain variation model of energy-storage units.
11. power variation rate module.The module is used for the calculated result according to module 9, establishes the change of energy-storage units power
Rate function.
12. energy variation prediction module.The module is used for according to the calculated result of module 10, establish energy-storage units energy with
The mathematical model of time change.
13. it is expected power peak module.The module is used for the calculated result according to module 11, finds out the appearance of power extreme value
Time, and then by the power Model in Time Domain established in module 8, calculate the peak value of VSG energy-storage units expectation power curve.
14. maximum frequency modulated time.The module is used to calculate the VSG energy-storage units by the model in module 12 can be according to
It is expected that power curve carries out the maximum time of continuous charge/discharge.The inside modules constitute as shown in Figure 3.
15. power contrast's module.The module is used to compare the maximum that expectation power peak and energy-storage units can actually undertake
Power, Inner Constitution are as shown in Figure 4.
16. time contrast module.The module is used to compare maximum frequency modulated time and power grid regulation under the VSG current working
VSG participate in the minimum time of frequency modulation, Inner Constitution is as shown in Figure 5.
17. parameter optimization module.The module is connected with power contrast's module 15 and time contrast module 16, for according to mould
The evaluation result of block 15,16 provides parameter optimization strategy.If the peak power output of VSG energy-storage units is not up under current working
Minimum time as defined in power grid is not achieved in the theoretical value or VSG maximum frequency modulated time determined to control parameter, then needs to resistance
The control parameters such as Buddhist nun's coefficient, inertia time constant optimize adjustment.
Detailed description of the invention
Fig. 1 is VSG topology and control block diagram of the invention.
Fig. 2 is the Inner Constitution of damping state determination module.
Fig. 3 is the Inner Constitution of the maximum frequency modulated time module.
Fig. 4 is power contrast's inside modules composition.
Fig. 5 is time contrast module Inner Constitution.
Fig. 6 is the prediction output power curve of VSG energy-storage units in embodiment.
Fig. 7 is the predictive ability change curve of VSG energy-storage units in embodiment.
Specific embodiment
Technical solution of the present invention is done below with reference to specific example and is further at large described.Obviously, described here
Embodiment is only a part of the embodiments of the present invention, rather than whole embodiments.Based on the embodiments of the present invention, this field
Those of ordinary skill it is obtained without making creative work so other embodiments, all should belong to this
Invent the range of protection.
Example: VSG basic parameter is as shown in table 1, it is assumed that when the step of mains frequency f generation -0.5Hz, the VSG simultaneously with
Virtual inertia support and primary frequency modulation two ways participate in frequency modulation work.According to national grid " virtual synchronous machine fire protection technology ",
When frequency declines, VSG participates in 10% that the increasable active power output maximum value of primary frequency modulation is not less than its rated capacity.Because of electricity
Net frequency fluctuation is usually no more than 0.5Hz, therefore settable primary frequency modulation coefficient is Kf=10.
1 VSG parameter setting of table
(1) it sets above-mentioned parameter to be acquired by parameter online acquisition module, through error-tested module verification, data are errorless.
(2) judge through operating mode determination module, which works in hopping pattern.
(3) transmission function is established are as follows:
(4) judge through system mode determination module, D2-8HSEω0< 0, the VSG system are in underdamping mode.
(5) it is calculated through pull-type inverse transform block, the time-domain expression of energy-storage units power output are as follows:
Energy-storage units, which go out, it is expected that power curve is as shown in Figure 6.
(6) after differentiation element is contributed, power variation rate function can be sorted out are as follows:
(7) in power variation rate module, change rate function is enabled to be equal to 0, when energy-storage units power output obtains extreme value, time t
Value are as follows:
T=0.1311arctan (- 6.138) (5)
(8) in power peak module, the time t for acquiring energy-storage units output power first time acquirement extreme value is taken as
0.227s, being substituted into power time-domain expression can obtain, and the peak value of energy-storage units power output is Δ Pe(0.227)=82.75kW.
(9) the integrated link processing of power time-domain expression.Energy-storage units energy variation expression formula can be obtained are as follows:
The capacity variation curve of energy-storage units is as shown in Figure 7.
(10) it is calculated through maximum frequency modulated time module, energy variation function E (t) is enabled to be equal to energy-storage units socking out capacity
Ecout, can be 28.44s in the hope of maximum discharge time.
(11) in power contrast's module, energy-storage units peak power output PcFor 100kW, greater than being obtained in prediction model
Greatest hope output power 82.75kW, therefore the power output capacity of the VSG can satisfy demand.
(12) in time contrast module, which is with the maximum time that such operating mode participates in electric system frequency modulation
28.44s meets the time demand of frequency modulation greater than the minimum time 15s that VSG as defined in national grid participates in primary frequency modulation.
(13) in parameter optimization module, it can satisfy the requirement of power and frequency modulated time under the VSG parameter current, but it is expected
Power peak goes out maximum output already close to energy-storage units, and output power nargin is little, therefore the direction of parameter optimization is to pass through
Adjust control parameter, the appropriate expectation power peak for reducing energy-storage units.
Claims (2)
1. virtual synchronous generator primary frequency modulation performance on-line evaluation and Parameter Optimization System, which is characterized in that described virtual same
Step generator primary frequency modulation performance on-line evaluation and Parameter Optimization System are contained with lower module: parameter online acquisition module (1),
Error-tested module (2), the locking module (3) of steady operation, operating mode determination module (4), transmission function module (5), resistance
Buddhist nun's state determination module (6), pull-type inverse transform block (7), time-domain power variation prediction module (8), derivative module (9), integral
Module (10), power variation rate module (11), energy variation prediction module (12), expectation power peak module (13), maximum tune
Frequency time module (14), power contrast's module (15), time contrast module (16), parameter optimization module (17).
2. virtual synchronous generator primary frequency modulation performance on-line evaluation as described in claim 1 and Parameter Optimization System, feature
It is, the virtual synchronous generator primary frequency modulation performance on-line evaluation and Parameter Optimization System are by monitoring running state, performance
It can evaluation and parameter optimization two parts composition；
The monitoring running state part, which is characterized in that parameter online acquisition module (1) is by power grid collected and VSG
Operating parameter and control parameter are sent to error-tested module (2), and error-tested module (2) will be with steady operation point module (3) phase
Even, and by the steady operation point of steady operation point module (3) locking VSG, steady operation point module (3), parameter online acquisition mould
Block (1) and error-tested module (2) form VSG monitoring running state part, and the data in the monitoring running state part can be same
When be sent into VSG controller part and functional evaluation and parameter optimization part；
The performance online evaluation and parameter optimization part, which is characterized in that operating mode determination module (4) and module (3) phase
Even, for determining whether VSG enters hopping pattern according to mains frequency and frequency difference, if determining in operating mode determination module (4)
VSG enters hopping pattern, then the transmission function module (5) being connected with operating mode determination module (4) is built according to the data of feeding
Transmission function between vertical frequency fluctuation situation and energy-storage units output power, damping state determination module (6) is according to transmitting letter
The characteristic equation for the transmission function established in digital-to-analogue block (5) judges that VSG system is in overdamp, underdamping, critical damping three
Any in kind state, pull-type inverse transform block (7) is connected with transmission function module (5) and damping state determination module (6)
And give transformation results to time-domain power prediction module (8), time-domain power prediction module (8) establishes energy-storage units output power
Time domain mathematical model is connected with differentiation element (9) and integral element (10) respectively, power variation rate module (11) and module (9)
It is connected, power variation rate module (11) send the change rate function of the energy-storage units power of foundation to desired power peak module
(13), it is expected that power peak module (13) send calculating energy-storage units expectation power extreme value to power contrast's module (15), energy
Variation prediction module (12) is connected with module (10), energy variation prediction module (12) by establish energy-storage units output energy when
Domain mathematical model is sent to maximum frequency modulated time module (14), and maximum frequency modulated time module (14) is continuous the energy-storage units of calculating
The maximum time of charge/discharge is sent to time contrast module (16), parameter optimization module (17) and power contrast's module (15) and when
Between contrast module (16) be connected.
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Application publication date: 20190621 Assignee: Baoding Baojia Electronic Instrument Co.,Ltd. Assignor: NORTH CHINA ELECTRIC POWER University (BAODING) Contract record no.: X2023990001001 Denomination of invention: Performance evaluation and parameter optimization system for primary frequency regulation of virtual synchronous generators Granted publication date: 20230321 License type: Common License Record date: 20231225 Application publication date: 20190621 Assignee: Hebei Zhongke Power Technology Co.,Ltd. Assignor: NORTH CHINA ELECTRIC POWER University (BAODING) Contract record no.: X2023990001000 Denomination of invention: Performance evaluation and parameter optimization system for primary frequency regulation of virtual synchronous generators Granted publication date: 20230321 License type: Common License Record date: 20231225 |