CN105552932A - Independent microgrid frequency hierarchical robust control method based on coordination of BESS and DE - Google Patents

Independent microgrid frequency hierarchical robust control method based on coordination of BESS and DE Download PDF

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CN105552932A
CN105552932A CN201510990629.XA CN201510990629A CN105552932A CN 105552932 A CN105552932 A CN 105552932A CN 201510990629 A CN201510990629 A CN 201510990629A CN 105552932 A CN105552932 A CN 105552932A
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frequency
control
bess
energy
storage
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马艺玮
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重庆邮电大学
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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
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/14—District level solutions, i.e. local energy networks

Abstract

The invention discloses an independent microgrid frequency hierarchical robust control method based on coordination of a BESS (Battery Energy Storage System, BESS) and a DE (Diesel Generator Energy, DE). The independent microgrid comprises two controllable power supplies for the BESS and the DE, and two uncontrollable power supplies for a wind power generation unit and a photovoltaic power generation system; the independent microgrid frequency hierarchical robust control method comprises the steps of (1) the BESS adopts H <infinity> control to replace the conventional droop control for realizing primary-level control for the system frequency; and (2) the DE speed regulation system adopts the H <infinity> control to replace the conventional PI control for realizing secondary-level control for the system frequency. According to the independent microgrid frequency hierarchical robust control method, the coordination and control for the two different controllable distributed power supplies for the BESS and the DE are realized; the frequency dynamic performance of the microgrid system is effectively improved; quick response and robustness of the system frequency are ensured; and the stability of the system frequency is improved.

Description

Based on the independent micro-capacitance sensor frequency layering robust control method that BESS and DE coordinates

Technical field

The present invention relates to micro-capacitance sensor FREQUENCY CONTROL technology, more particularly, relate to a kind of independent micro-capacitance sensor frequency layering robust control method coordinated based on energy-storage system of accumulator and diesel generating set.

Background technology

Current, the energy mix micro-capacitance sensor of integrated various distributed power source and energy-storage system has become a kind of provides flexible, reliable and economic supply of electric power mode, and it effectively can solve the electricity shortage problem of the remote districts such as island, mountain area.Along with continuous progress and the development of distributed generation technology, the regenerative resource such as wind power generation and solar energy power generating distributed power source accounting in micro-capacitance sensor is also increasing, but their intrinsic intermittent characteristics of output power easily cause the active power of micro-grid system uneven, thus cause system frequency fluctuation problem.

Through finding the literature search of prior art, " HinfinityControllerDesignforPrimaryFrequencyControlofEne rgyStorageinIslandingMicrogrid " (JiravanMongkoltanatas, DelphineRiu, andXavierLePivert.HinfinityControllerDesignforPrimaryFre quencyControlofEnergyStorageinIslandingMicrogrid [C] .15thEuropeanConferenceonPowerElectronicsandApplications, Lille, France:IEEE, 2013:1-11.) literary composition is for micro-grid system frequency fluctuation, adopt H ∞the droop control strategy that control method improves energy storage device improves a frequency characteristics control.But, still need higher acquisition cost problem for current energy-storage units and inverter thereof, most of micro-capacitance sensor projects (especially MW class capacity) that actual development is built all are configured with the diesel generating set of some to improve system power supply reliability and to reduce equipment purchasing cost.Point out that the energy-storage system of accumulator of configuration certain capacity and diesel generating set are the keys ensureing micro-grid system high reliability and frequency stabilization around the research and practice containing multiple energy mix micro-capacitance sensor.But the document improving micro-grid system frequency stability about research batteries to store energy and the cooperation control between diesel generating set is relative less.Application number be 201510170324.4 Chinese invention patent application propose based on the independent micro-capacitance sensor hierarchical coordinative control method of Different time scales, wherein energy-storage system of accumulator adopts traditional droop control, diesel generating set governing system adopts PI to control, thus there is the deficiencies such as system inertia is little, the frequency adjustment time is relatively long.Therefore, during the system net load power fluctuation problem that energy-storage system of accumulator and diesel generating set cause tackling the wind-powered electricity generation of micro-grid system internal cause transient change and photovoltaic power output, still there is poor frequency adjustment response problem.

The present invention proposes a kind of independent micro-capacitance sensor frequency layering robust control new method based on energy-storage system of accumulator and diesel generating set coordination strategy on Different time scales, the method is by adopting H ∞control to improve traditional droop control strategy of energy-storage system of accumulator and improve the transient response of micro-capacitance sensor when processing the fluctuation of transient state small frequency and robustness, and adopt H ∞the conventional PI control device controlled in improvement diesel generating set governing system improves the no frequency-deviation control characteristic when processing larger frequency fluctuation.The method takes full advantage of the Different Dynamic regulating characteristics (time resolution characteristics and power adjustments characteristic etc.) of energy-storage system of accumulator and diesel generating set, the system frequency dynamic robust characteristic of effective raising independent micro-grid system when in the face of frequency disturbance problem in various degree, improves the stability of system frequency.

Summary of the invention

For above existing deficiency, propose a kind of frequency dynamic performance that effectively improve independent micro-grid system, ensure that fast-response and the robustness of system frequency, improve the frequency layering robust control method of the independent micro-capacitance sensor of the stability of system frequency.Technical scheme of the present invention is as follows: a kind of independent micro-capacitance sensor frequency layering robust control method coordinated based on BESS and DE, and it comprises the following steps:

101, the active power of output P of diesel generating set is obtained dE, wind turbine generator active power of output P wT, photovoltaic generating system active power of output P pV, energy-storage system of accumulator charge/discharge active-power P bESSand system burden with power aggregate demand P l, calculate the gross output P of independent micro-grid system mGfollowing relational expression is met with the frequency deviation f of active power deviation delta P, independent micro-grid system and active power deviation delta P:

&Delta; f &Delta; P = G ( s ) = 1 s M + D

Wherein, Δ P=P mG-P l, P mG=P dE+ P wT+ P pV± P bESS, "+" represents energy storage system discharges, and "-" represents energy-storage system charging, and M is inertia constant, and D is damping coefficient, and s is Laplacian;

102, according to independent micro-grid system frequency fluctuation characteristic, the fluctuating range of system frequency is divided into A, B, C and D tetra-regions, a-quadrant comprises low frequency A ldistrict and high frequency A hdistrict, B region comprises low frequency B ldistrict and high frequency B h, C region comprises low frequency C ldistrict and high frequency C hdistrict, D district comprises low frequency D ldistrict and high frequency D hdistrict;

103, the net load wave component in independent micro-grid system except wind-powered electricity generation and photovoltaic are exerted oneself is categorized into three classes;

104, micro-capacitance sensor frequency heterarchical architecture is adopted three layers of control;

(1) ground floor is based on H ∞the one-level of the energy-storage system of accumulator controlled controls;

(2) second layer is based on H ∞the Two-stage control of the diesel engine generator controlled;

(3) third layer is three class control based on system-level central controlled micro-capacitance sensor CCC MGCC or economical operation control model.

Further, the a-quadrant in step 102 is 49.5Hz≤f≤50.5Hz, B llow frequency range is 48Hz≤f < 49.5Hz, B hhigh frequency region is 50.5Hz < f≤51Hz, C llow frequency range is 47.5Hz≤f < 48Hz, C hhigh frequency region is 51Hz < f≤51.5Hz, and D district is f > 51.5Hz or f < 47.5Hz.

Further, in described step 103, the load except exerting oneself except wind-powered electricity generation and photovoltaic and net load wave component are categorized as following three classes according to Changing Pattern:

(1) period of change is the random fluctuation net load component of Millisecond;

(2) period of change is the net load component of level second;

(3) period of change is the lasting slowly variation net load component of minute level or hour level.

Further, the H of energy-storage system of accumulator is designed in step 104 ∞controller is specially:

(1) energy-storage system of accumulator H is designed ∞controller:

1. the H of energy-storage system of accumulator ∞controller K 1be input as system frequency deviation Δ f, the output of controller is P bESS, by controlling the power output P of energy-storage system of accumulator bESSrealize the frequency adjustment of micro-grid system;

2. weighting function W is selected 1, W 2, and W 3, meet || W 1 ( s ) S ( s ) W 2 ( s ) K 1 ( s ) S ( s ) W 3 ( s ) T ( s ) || &infin; &le; 1 , Wherein, S (s) is closed-loop control system sensitivity function, and T (s) is closed-loop control system complementary sensitivity function, and S (s) and T (s) is decision systems tracking error size and system robust stability respectively;

W 1 = 53 2.4 s + 0.01

W 2＝0.0001

W 3 = 1.1 &times; 10 - 6 s + 0.1 s + 8

3. the time constant choosing energy-storage system of accumulator is T=0.3, by the robust control tool box in Matlab/Similink, tries to achieve the H of energy-storage system of accumulator ∞controller

Further, the H of diesel generating set is designed in step 104 ∞controller is specially:

1. the H of diesel generating set ∞controller K 2be input as system frequency deviation Δ f, the output of controller is P dE, by controlling the power output P of diesel generating set dErealize the non differential regulation of micro-grid system frequency;

2. weighting function W is selected 1', W 2' and W 3', meet || W 1 &prime; ( s ) S ( s ) W 2 &prime; ( s ) K 2 ( s ) S ( s ) W 3 &prime; ( s ) T ( s ) || &infin; &le; 1 ,

W 1 &prime; = 2.848 s 2 + 0.055 s + 0.001

W 2'＝0.0015

W 3 = 0.0025 s 2 + 0.00167 s + 2 &times; 10 - 5 s 2 + 8.116 s + 12.59

3. the time parameter T of diesel generating set governing system is chosen 1=0.25, T 2=0.09, T 3=0.4, T 1=1, proportionality coefficient is K=10, utilizes Matlab robust control tool box, tries to achieve diesel generating set H ∞controller K 2 ( s ) = 682.4 s 2 + 1476 s + 1138 s 3 + 84.19 s 2 + 4.643 s + 0.08438

Advantage of the present invention and beneficial effect as follows:

The present invention is by the H of advanced person ∞control technology and hierarchical control technology are applied in micro-capacitance sensor FREQUENCY CONTROL, according to micro-capacitance sensor dynamic characteristic of power frequency, be A, B, C and D tetra-regions by the fluctuating range of system frequency according to certain partition of the level, a-quadrant belongs to frequency fluctuation normal range (NR), energy-storage system of accumulator and diesel generating set do not do extra control, the system frequency in B region exceeds frequency allowable fluctuation range a little, adopts H by energy-storage system of accumulator ∞control technology compensates load power vacancy in Millisecond time scale, makes system frequency return to a-quadrant; The system frequency in C region seriously exceeds frequency allowable fluctuation range, adopts H by diesel generating set ∞control technology compensates load power vacancy in second in level time scale, makes system frequency return to rated value; D district representative system frequency has exceeded normal controlled range, and corresponding error protection control technology should be adopted to excise fault fast, and recovery system is stablized.The present invention makes full use of the advantage such as the transient response of energy-storage system of accumulator and the indifference control of diesel generating set, adopt frequency robust hierarchical control method, subregion controls system frequency from Millisecond to level second, improve the frequency dynamic performance of independent micro-grid system, ensure that fast-response and the robustness of system frequency, improve the stability of system frequency.The FREQUENCY CONTROL that the present invention is micro-capacitance sensor provides a kind of new solution and approach, the low-carbon electric power technology such as regenerative resource distributed generation technology, micro-capacitance sensor technology that can effectively promote is in the application of China and popularization, promote low-carbon economy development, the research ideas and methods that of Ye Shi active response China new forms of energy development strategy is new.

Accompanying drawing explanation

Fig. 1 is the FREQUENCY CONTROL subregion of the micro-grid system that the invention provides preferred embodiment;

Fig. 2 is the independent micro-capacitance sensor frequency heterarchical architecture based on Different time scales;

Fig. 3 is the H of energy-storage system of accumulator ∞control block diagram;

Fig. 4 is the H of diesel generating set ∞control block diagram;

Fig. 5 is the FREQUENCY CONTROL coordination strategy of energy-storage system of accumulator and diesel generating set;

Fig. 6 is the micro-grid system structure chart built in Matlab/Simulink;

Fig. 7 is independent micro-grid system burden with power demand curve;

Fig. 8 is the power output of wind-powered electricity generation and photovoltaic in independent micro-capacitance sensor;

Fig. 9 is the power output of energy-storage system of accumulator and diesel generating set;

Figure 10 is the micro-capacitance sensor frequency robust control performance map coordinated based on energy-storage system of accumulator and diesel generating set.

Figure 11 is system frequency control block diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the invention will be further described:

To achieve these goals, the invention provides a kind of independent micro-capacitance sensor frequency layering robust control method coordinated based on energy-storage system of accumulator and diesel generating set, its overall implementation method comprises the steps:

Step 1: the frequency deviation f and the active power deviation delta P that calculate independent micro-grid system meet following relational expression:

&Delta; f &Delta; P = G ( s ) = 1 s M + D

Wherein, Δ P=P mG-P l, P mGfor the gross output (P of independent micro-grid system mG=P dE+ P wT+ P pV± P bESS, P dEfor the active power of output of diesel generating set, P wTfor the active power of output of wind turbine generator, P pVfor the active power of output of photovoltaic generating system, P bESSfor the charge/discharge active power of energy-storage system of accumulator, "+" represents energy storage system discharges, and "-" represents energy-storage system charging), P lfor system burden with power aggregate demand, M is inertia constant, and D is damping coefficient, and s is Laplacian, can obtain the transfer function G (s) of controlled device thus, and controlled device involved in the present invention comprises energy-storage system of accumulator and diesel generating set;

Step 2: according to independent micro-grid system frequency fluctuation characteristic, be A, B, C and D tetra-regions by the fluctuating range of system frequency according to certain partition of the level, a-quadrant representative system frequency departure is in quality of power supply national standard claimed range, B Regional Representative system frequency exceeds frequency allowable fluctuation range a little, C Regional Representative system frequency seriously exceeds frequency allowable fluctuation range, and D district representative system frequency has exceeded normal controlled range;

Step 3: net load (load except wind-powered electricity generation and the photovoltaic are exerted oneself) wave component in independent micro-grid system is divided into following three classes according to Changing Pattern:

(1) the random fluctuation net load component that period of change is Millisecond, amplitude of variation is less;

(2) period of change is the net load component of level second;

(3) period of change is the lasting slowly variation net load component of minute level or hour level.

Step 4: the H designing controlled device energy-storage system of accumulator and diesel generating set respectively ∞controller:

(1) energy-storage system of accumulator H is designed ∞controller:

1. the H of energy-storage system of accumulator ∞controller K 1be input as system frequency deviation Δ f, the output of controller is P bESS, by controlling the power output P of energy-storage system of accumulator bESSrealize the frequency adjustment of micro-grid system;

2. weighting function W is selected 1, W 2, and W 3, meet || W 1 ( s ) S ( s ) W 2 ( s ) K 1 ( s ) S ( s ) W 3 ( s ) T ( s ) || &infin; &le; 1 , Wherein, S (s) is closed-loop control system sensitivity function, and T (s) is closed-loop control system complementary sensitivity function, and S (s) and T (s) is decision systems tracking error size and system robust stability respectively;

W 1 = 53 2.4 s + 0.01

W 2＝0.0001

W 3 = 1.1 &times; 10 - 6 s + 0.1 s + 8

3. the time constant choosing energy-storage system of accumulator is T=0.3, by the robust control tool box in Matlab/Similink, tries to achieve the H of energy-storage system of accumulator ∞controller

(2) H of diesel generating set is designed ∞controller:

1. the H of diesel generating set ∞controller K 2be input as system frequency deviation Δ f, the output of controller is P dE, by controlling the power output P of diesel generating set dErealize the non differential regulation of micro-grid system frequency;

2. weighting function W is selected 1', W 2' and W 3', meet || W 1 &prime; ( s ) S ( s ) W 2 &prime; ( s ) K 2 ( s ) S ( s ) W 3 &prime; ( s ) T ( s ) || &infin; &le; 1 , Weighting function W 1', W 2' and W 3' determine diesel generating set governing system H ∞the performance of controller;

W 1 &prime; = 2.848 s 2 + 0.055 s + 0.001

W 2'＝0.0015

W 3 = 0.0025 s 2 + 0.00167 s + 2 &times; 10 - 5 s 2 + 8.116 s + 12.59

3. the time parameter T of diesel generating set governing system is chosen 1=0.25, T 2=0.09, T 3=0.4, T 1=1, proportionality coefficient is K=10, utilizes Matlab robust control tool box, tries to achieve diesel generating set H ∞controller K 2 ( s ) = 682.4 s 2 + 1476 s + 1138 s 3 + 84.19 s 2 + 4.643 s + 0.08438

Micro-capacitance sensor frequency robust control structural design is heterarchical architecture by step 5: by step 2, step 3 and step 4, comprises following three layers:

(1) ground floor is based on H ∞the one-level of the energy-storage system of accumulator controlled controls, and the randomness net load wave component that, the cycle little mainly for amplitude of variation is short, the B region be described in step 2 (comprises low frequency B ldistrict and high frequency B hdistrict), this Regional Representative exceeds normal frequency restriction frequency departure more by a small margin, take full advantage of the advantage such as fast transient response and better power back-off of energy-storage system of accumulator, can in Millisecond time scale effective compensation load power vacancy, inhibit system frequency to fluctuate fast, improve the stability of system frequency;

(2) second layer is based on H ∞the Two-stage control of the diesel engine generator controlled, mainly for the impact net load component of vary within wide limits, cycle length, the C region be described in step 2 (comprises low frequency C ldistrict and high frequency C hdistrict), this Regional Representative exceeds normal frequency scope frequency departure by a relatively large margin, utilize the adjustment of diesel generating set governing system and change unit export active power, to deal with in micro-grid system the large and change frequency departure relatively slowly of this type of fluctuating range, the indifference realizing system frequency controls, and makes frequency retrieval to rated value.

(3) third layer is three class control based on system-level central controlled micro-capacitance sensor CCC (MGCC) or economical operation, mainly for changing load cycling component slowly in cycle long period, being generally input energy sources in a day and arranging generation schedule.

Compared with prior art, the present invention considers the system loading of the intermittent power supplys such as high permeability wind-powered electricity generation and photovoltaic and frequent switching, according to the dynamic characteristic of power frequency of independent micro-capacitance sensor, be A to frequency fluctuation amplitude according to certain partition of the level, B, C and D tetra-regions, a-quadrant representative system frequency departure is in quality of power supply national standard claimed range, B Regional Representative system frequency exceeds frequency allowable fluctuation range a little, utilize the fast power of energy-storage system of accumulator to compensate to stabilize that to have fluctuating range little and change this type of fast frequency departure, system frequency is fluctuated and returns to A district, C Regional Representative system frequency seriously exceeds frequency allowable fluctuation range, utilizes diesel generating set output power to deal with the large and change frequency departure relatively slowly of this type of fluctuating range, makes it return to rated value, D district representative system frequency has exceeded normal controlled range, and corresponding error protection control technology should be adopted to excise fault fast, and recovery system is stablized.In the present invention, energy-storage system of accumulator and diesel generating set all have employed H ∞control technology, energy-storage system of accumulator can in Millisecond time scale effective compensation load power vacancy, diesel generating set can second realize in level system frequency indifference control, effectively improve the frequency dynamic performance of independent micro-capacitance sensor, ensure that fast-response and the robustness of system frequency.

Consult Fig. 1, Fig. 2 and Fig. 5, in the process of embody rule of the present invention, frequency adjustment mainly comprises the steps:

Step 1: according to the dynamic characteristic of power frequency of micro-capacitance sensor, be A, B, C and D tetra-regions to frequency fluctuation amplitude according to certain partition of the level, wherein, a-quadrant representative system frequency departure is in quality of power supply national standard claimed range, B Regional Representative system frequency exceeds frequency allowable fluctuation range a little, C Regional Representative system frequency seriously exceeds frequency allowable fluctuation range, and D district representative system frequency has exceeded normal controlled range;

Step 2: in micro-grid system, the controller of each distributed power source is monitored in real time and gathers the frequency f value of micro-grid system, and judges the FREQUENCY CONTROL subregion at this value place;

Step 3: judge that whether system frequency f is at normal range (NR) Nei Ji A district (49.5Hz≤f≤50.5Hz), if f is in a-quadrant, then energy-storage system of accumulator and diesel generating set do not participate in regulating; If f not in a-quadrant, then enters step 4;

Step 4: judge that whether f is at B llow frequency range (48Hz≤f < 49.5Hz), if at B lregion, energy-storage system of accumulator carrys out the frequency of regulating system by control of discharge, makes frequency get back to A district, if remaining battery capacity is lower than the lowest capacity of storage battery, then needs the active power regulating diesel generating set to export, system frequency is recovered; If f is not at B llow frequency range, then enter step 5;

Step 5: judge that whether f is at B hhigh frequency region (50.5Hz < f≤51Hz), if at B hregion, energy-storage system of accumulator controls the frequency of regulating system by charging, frequency is made to get back to A district, if remaining battery capacity equals the heap(ed) capacity of storage battery, then need the priority according to wind turbine generator and photovoltaic generating system and quality of power supply height cut-out portion independent power source, make system frequency maintain in allowable fluctuation range; If f is not at B hhigh frequency region, then enter step 6;

Step 6: judge that whether f is at C llow frequency range (47.5Hz≤f < 48Hz), if at C ldistrict, system active power vacancy is comparatively large, and the active power that need increase diesel generating set exports, and makes system frequency return to rated value, exerts oneself if diesel generating set has reached maximum technology, then according to load rating unloading part interruptible load; If f is not at C llow frequency range, then enter step 7;

Step 7: judge that whether f is at C hhigh frequency region (51Hz < f≤51.5Hz), if at C hdistrict, the power stage of diesel generating set need be reduced, make the rated value that system frequency is recovered, exert oneself if diesel generating set has reached minimum technology, then need the priority according to wind turbine generator and photovoltaic generating system and quality of power supply height cut-out portion independent power source, system frequency is recovered; If f is not at C hhigh frequency region, then enter step 8;

Step 8: judge that whether f is at D district (f > 51.5Hz or f < 47.5Hz); if in D district; represent that independent micro-grid system frequency exceeds normal controlled range; system receives larger disturbance as problems such as the system failures; corresponding error protection control technology should be adopted to excise fault fast, and recovery system normally runs.

Step 9: repeated acquisition system frequency f, until judge that f is in a-quadrant, reaches the object of recovery system frequency quality.

Consult Fig. 6, the present invention builds wind-light-diesel and stores energy mix independence micro-capacitance sensor simulation model in Matlab/Simulink, simulation result is as shown in Fig. 7-Figure 10, simulation results show institute's extracting method effectively can improve the frequency dynamic performance of micro-capacitance sensor, ensure that fast-response and the robustness of system frequency.

These embodiments are interpreted as only being not used in for illustration of the present invention limiting the scope of the invention above.After the content of reading record of the present invention, technical staff can make various changes or modifications the present invention, and these equivalence changes and modification fall into the scope of the claims in the present invention equally.

Claims (5)

1., based on the independent micro-capacitance sensor frequency layering robust control method that BESS and DE coordinates, it is characterized in that, comprise the following steps:
101, the gross output P of independent micro-grid system is obtained mG, diesel generating set active power of output P dE, wind turbine generator active power of output P wT, photovoltaic generating system active power of output P pV, energy-storage system of accumulator charge/discharge active-power P bESSand system burden with power aggregate demand P l, calculate the frequency deviation f of independent micro-grid system, meet following relational expression with active power deviation delta P:
&Delta; f &Delta; P = G ( s ) = 1 s M + D
Wherein, Δ P=P mG-P l, P mG=P dE+ P wT+ P pV± P bESS, "+" represents energy storage system discharges, and "-" represents energy-storage system charging), M is inertia constant, and D is damping coefficient, and s is Laplacian;
102, according to independent micro-grid system frequency fluctuation characteristic, the fluctuating range of system frequency is divided into A, B, C and D tetra-regions, a-quadrant comprises low frequency A ldistrict and high frequency A hdistrict, B region comprises low frequency B ldistrict and high frequency B h, C region comprises low frequency C ldistrict and high frequency C hdistrict, D district comprises low frequency D ldistrict and high frequency D hdistrict;
103, the net load wave component in independent micro-grid system except wind-powered electricity generation and photovoltaic are exerted oneself is categorized into three classes;
104, micro-capacitance sensor frequency heterarchical architecture is adopted three layers of control;
(1) ground floor is based on H ∞the one-level of the energy-storage system of accumulator controlled controls;
(2) second layer is based on H ∞the Two-stage control of the diesel engine generator controlled;
(3) third layer is three class control based on system-level central controlled micro-capacitance sensor CCC MGCC or economical operation control model.
2. the independent micro-capacitance sensor frequency layering robust control method coordinated based on BESS and DE according to claim 1, it is characterized in that, the a-quadrant in step 102 is 49.5Hz≤f≤50.5Hz, B llow frequency range is 48Hz≤f < 49.5Hz, B hhigh frequency region is 50.5Hz < f≤51Hz, C llow frequency range is 47.5Hz≤f < 48Hz, C hhigh frequency region is 51Hz < f≤51.5Hz, and D district is f > 51.5Hz or f < 47.5Hz.
3. the independent micro-capacitance sensor frequency layering robust control method coordinated based on BESS and DE according to claim 1 and 2, it is characterized in that, in described step 103, the load fluctuation component except exerting oneself except wind-powered electricity generation and photovoltaic and net load wave component are categorized as following three classes according to Changing Pattern:
(1) period of change is the random fluctuation net load component of Millisecond;
(2) period of change is the net load component of level second;
(3) period of change is the lasting slowly variation net load component of minute level or hour level.
4. the independent micro-capacitance sensor frequency layering robust control method coordinated based on BESS and DE according to claim 3, is characterized in that, design the H of energy-storage system of accumulator in step 104 ∞controller is specially:
1. the H of energy-storage system of accumulator ∞controller K 1be input as system frequency deviation Δ f, the output of controller is P bESS, by controlling the power output P of energy-storage system of accumulator bESSrealize the frequency adjustment of micro-grid system;
2. weighting function W is selected 1, W 2, and W 3, meet | | W 1 ( s ) S ( s ) W 2 ( s ) K 1 ( s ) S ( s ) W 3 ( s ) T ( s ) | | &infin; &le; 1 , Wherein, S (s) is closed-loop control system sensitivity function, and T (s) is closed-loop control system complementary sensitivity function, and S (s) and T (s) is decision systems tracking error size and system robust stability respectively;
W 1 = 53 2.4 s + 0.01
W 2＝0.0001
W 3 = 1.1 &times; 10 - 6 s + 0.1 s + 8
3. the time constant choosing energy-storage system of accumulator is T=0.3, by the robust control tool box in Matlab/Similink, tries to achieve the H of energy-storage system of accumulator ∞controller
5. the independent micro-capacitance sensor frequency layering robust control method coordinated based on BESS and DE according to claim 3, is characterized in that, design the H of diesel generating set in step 104 ∞controller is specially:
1. the H of diesel generating set ∞controller K 2be input as system frequency deviation Δ f, the output of controller is P dE, by controlling the power output P of diesel generating set dErealize the non differential regulation of micro-grid system frequency;
2. weighting function W is selected 1', W 2' and W 3', meet | | W 1 &prime; ( s ) S ( s ) W 2 &prime; ( s ) K 2 ( s ) S ( s ) W 3 &prime; ( s ) T ( s ) | | &infin; &le; 1 ,
W 1 &prime; = 2.848 s 2 + 0.055 s + 0.001
W 2'＝0.0015
W 3 = 0.0025 s 2 + 0.00167 s + 2 &times; 10 - 5 s 2 + 8.116 s + 12.59
3. the time parameter T of diesel generating set governing system is chosen 1=0.25, T 2=0.09, T 3=0.4, T 1=1, proportionality coefficient is K=10, utilizes Matlab robust control tool box, tries to achieve diesel generating set H ∞controller K 2 ( s ) = 682.4 s 2 + 1476 s + 1138 s 3 + 84.19 s 2 + 4.643 s + 0.08438 .
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