CN102983589B - Control method of grid friendly type distributed power source based on hybrid energy storage - Google Patents

Control method of grid friendly type distributed power source based on hybrid energy storage Download PDF

Info

Publication number
CN102983589B
CN102983589B CN201210460689.7A CN201210460689A CN102983589B CN 102983589 B CN102983589 B CN 102983589B CN 201210460689 A CN201210460689 A CN 201210460689A CN 102983589 B CN102983589 B CN 102983589B
Authority
CN
China
Prior art keywords
voltage
converter
control
power
power source
Prior art date
Application number
CN201210460689.7A
Other languages
Chinese (zh)
Other versions
CN102983589A (en
Inventor
鲍薇
李光辉
何国庆
孙艳霞
赵伟然
冯凯辉
Original Assignee
中国电力科学研究院
中电普瑞张北风电研究检测有限公司
国家电网公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中国电力科学研究院, 中电普瑞张北风电研究检测有限公司, 国家电网公司 filed Critical 中国电力科学研究院
Priority to CN201210460689.7A priority Critical patent/CN102983589B/en
Publication of CN102983589A publication Critical patent/CN102983589A/en
Application granted granted Critical
Publication of CN102983589B publication Critical patent/CN102983589B/en

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

The invention provides a control method of a grid friendly type distributed power source based on hybrid energy storage. The method comprises the steps of optimally designing a topology structure of the distributed power source, controlling a direct current power supply system in a coordinating mode through a direct current (DC)/DC converter controlling a model normalization model, and self-adaptively controlling a grid of an alternating current (AC) side DC /AC converter. The distributed power source not only can be connected in a large grid to operate so as to reduce the influence of intermittent renewable energy power generation grid connection on the grid and provide support of voltage and frequency for the grid, but also can be connected into a micro-grid to operate as a network unit of the off-network type micro-grid to maintain stability of voltage and frequency of the off-network type micro-grid. When an outer grid breaks down, the distributed power source can realize switch between a grid mode and an island mode so as to improve power supply reliability of important loads in the system. The distributed power source improves technical performance and economic performance of the whole system through matching utilization of an energy type system and a power type energy storage system.

Description

The control method of the friendly type distributed power source of a kind of electrical network based on hybrid energy-storing
Technical field
The present invention relates to distributed power source operation and control, be specifically related to the control method of the friendly type distributed power source of a kind of electrical network based on hybrid energy-storing.
Background technology
The friendly characteristic of electrical network that realizes the distributed power source based on hybrid energy-storing, the control strategy of distributed power source AC converter and effective utilization of hybrid energy-storing are the key technical problems that emphasis need to solve.
(1) distributed power source control strategy
Batch (-type) renewable energy power generation, especially wind power generation and photovoltaic generation, its exert oneself there is intermittence, the feature such as fluctuation and uncontrollability, if be incorporated into the power networks, can bring a series of impact to the safety and stability of electrical network.In order to reduce the impact of renewable energy source power on electrical network, with the renewable energy power generation unit of energy-storage system, can stabilize the power fluctuation of renewable energy power generation, distributed power generation unit is carried out determining power control, can make it according to dispatch command, control its power output.But, outstanding along with environment and energy problem, distributed power source shared ratio in electrical network is increasing, in order to guarantee the safe and reliable operation of electrical network, also more and more higher to distributed power source requirement in grid-connected standard, need distributed power source to possess certain line voltage and frequency supporting role, and adopt the distributed power source of determining power control also not possess this function.
In micro-electrical network, the control method of distributed power source have V ?F control, P ?Q control, Droop controls three types, the distributed power source that adopts Droop to control possesses certain line voltage supporting role, the networking unit that can be used as micro-electrical network moves.But the distributed power source that adopts Droop to control is applied in micro-electrical network, also there is certain problem, as do not considered the impedance model of circuit, can not be applicable to micro-electrical network of various line impedance models, do not possess and conventional unit between power-sharing effect etc., and for adopting the seamless switching of micro-power supply of this kind of control strategy to control also more rare.
(2) hybrid energy-storing control technology
In the Distributed Renewable Energy Power System with energy-storage system, conventionally select storage battery as energy-storage travelling wave tube, but storage battery as the energy-storage travelling wave tube of energy type, have that power density is low, charge and discharge cycles times influence its useful life etc. shortcoming.Super capacitor is as power-type energy-storage travelling wave tube, because its power density is high, have extended cycle life, the advantage such as efficiency for charge-discharge is high, Maintenance free, just receive increasing concern, but because its energy density is lower, be also difficult at present realize jumbo electric power energy storage.Storage battery and ultracapacitor are mixed and are used, be applied to renewable energy system, make the large and super capacitor power density of storage battery energy density greatly, the feature that has extended cycle life combines, and can greatly promote technical performance and the economic performance of whole system.
At present, existing researcher is applied to electric automobile, compact power and renewable energy source domain for hybrid energy-storing and did some researchs, has mainly proposed following several hybrid energy-storing structures:
(1) storage battery and ultracapacitor are directly in parallel.Storage battery, the direct parallel connection of ultracapacitor is the simplest a kind of hybrid energy-storing structure, adopt this structure, can be when there is fluctuation in load, significantly reduce the maximum output current of storage battery during the fluctuation of load, improve the maximum power output ability of mixed energy storage system, but in this structure, because the terminal voltage of batteries and the terminal voltage of bank of super capacitors are forced to equate, cause capacity of super capacitor utilance low, in design, to the connection in series-parallel compound mode of bank of super capacitors, require also comparatively strict, and the course of work of storage battery can not be set flexibly, can not realize the efficient utilization of dissimilar energy storage device.
(2) storage battery is in parallel with super capacitor by DC/DC power inverter.Storage battery is in parallel with super capacitor by DC/DC converter, by the appropriate design to power inverter control strategy, can realize the charge and discharge process of batteries is carried out to flexible management, the advantage of better performance ultracapacitor, improve the performance of hybrid accumulator, extend the useful life of storage battery.But, super capacitor is directly hung on DC bus, ultracapacitor is in charge and discharge process, and terminal voltage can change along with the variation of energy storage capacity, and change in voltage amplitude is larger, and DC bus-bar voltage is unstable.
(3) ultracapacitor is in parallel with storage battery by DC/DC converter.In order to obtain stable DC bus-bar voltage, there is document to propose ultracapacitor by the DC/DC converter hybrid energy-storing structure in parallel with batteries, although during power fluctuation, DC bus-bar voltage is comparatively stable, but adopt this structure, the flexible management of batteries input and output energy can not be realized equally, the effect of all kinds energy storage device can not be given full play to.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides the converter control method of the friendly type distributed power source of a kind of electrical network based on hybrid energy-storing, this distributed power source both can be incorporated to large operation of power networks, reduce the impact of intermittent renewable energy source power on electrical network, and provide voltage and frequency to support to electrical network; Also can and electrical network in a subtle way, the networking unit operation as from the micro-electrical network of net type, maintains from voltage and the frequency stabilization of the micro-electrical network of net type; When external electrical network breaks down, this distributed power source can also be realized the double mode switching of grid-connected/isolated island, the power supply reliability of important load in raising system.This distributed power source is coordinated and is utilized by energy type and power-type energy-storage system, has improved whole system technical performance and economic performance.
In order to realize foregoing invention object, the present invention takes following technical scheme:
The control method that the friendly type distributed power source of a kind of electrical network based on hybrid energy-storing is provided, said method comprising the steps of:
Step 1: the topological structure of optimal design distributed power source;
Step 2: coordinate to control DC power-supply system by DC/DC convertor controls pattern normalization model;
Step 3: the electrical network adaptive control of AC DC/AC converter.
In the topological structure of the distributed power source of described step 1, intermittent renewable energy system, lithium battery energy storage battery system and super capacitor energy-storage system are in parallel with DC bus by DC/DC converter A, DC/DC converter B and DC/DC converter C respectively, form the DC power-supply system of distributed power source, this DC power-supply system is connected with AC system by AC DC/AC converter, forms distributed power source.
In described step 2, DC/DC converter comprises DC/DC converter A, DC/DC converter B and DC/DC converter C; The control model of DC/DC converter comprises determines voltage mode control, constant current control model and permanent power control mode; Choosing of power magnitude limit value by the instruction of voltage control loop reference power, current regulator current amplitude limit value and power control loop, determines above-mentioned different control model; Constant current control model comprises constant current charge control model and constant current discharge control model.
In described DC/DC convertor controls pattern normalization model, the difference of the reference value of busbar voltage and its measured value regulates through PI, pass through again current limit link, obtain the reference value of energy-storage system output current, the difference of energy-storage system output current reference value and its output current measured value regulates through PI, and then by power limiting link, obtain the reference value of energy-storage system power output, as the switch triggering signal of DC/DC converter; Described energy-storage system comprises lithium battery energy storage battery system and super capacitor energy-storage system.
Described step 2 comprises the following steps:
Step 2 ?1: tuning controller is measured DC bus-bar voltage U in real time dC, the state-of-charge of lithium battery and the terminal voltage of super capacitor, and according to Monitoring Data, determine the control model of DC/DC converter;
Step 2 ?2: tuning controller is measured the load power P of the friendly type distributed power source of described electrical network in real time lpower output P with intermittent renewable energy system r, calculate the power shortage P of described mixed energy storage system s, P s=P l-P r, and extract P sin low frequency component P b_ref, described P b_reffor the value and power reference of permanent power control mode lithium battery energy storage battery system, P lfor the load power of distributed power source, P rpower output for intermittent renewable energy system;
Step 2 ?3: when DC bus-bar voltage drops on region 1, i.e. U 0< U dC< U 1time, DC/DC converter A is operated in and determines voltage mode control, and its reference voltage is got U ref1, the current amplitude limit value of current regulator and the power magnitude limit value of power control loop are got respectively I max1and P max1; DC/DC converter B and DC/DC converter C do not work;
Wherein: U 0the maximum that-DC bus-bar voltage allows;
U dCthe real-time measurement values of-DC bus-bar voltage;
U ref1when-DC bus-bar voltage drops on region 1, the fixed voltage-controlled voltage reference value of DC/DC converter A, its choosing value is positioned at region 1, i.e. U 0< U ref1< U 1;
I max1-DC/DC converter A current regulator allows the current maxima of passing through;
P max1-DC/DC converter A power control loop allows the maximum power of sending;
Step 2 ?4: when DC bus-bar voltage drops on region 2, i.e. U 2< U dC< U 1time, DC/DC converter A is operated in MPPT control model, and DC/DC converter B is operated in and determines voltage mode control, and its reference voltage is got U ref2, the current amplitude limit value of current regulator and the power magnitude limit value of power control loop are got respectively I max2and P max2; DC/DC converter C is operated in constant current discharge control model, and the reference voltage of its voltage control loop is got U ref_ab, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I sc_refand P max3; In this process, the terminal voltage U of tuning controller Real-Time Monitoring super capacitor ucif U detected min<U uc<U max, proceed to step 2 ?5 operation;
Wherein: U ref2when-DC bus-bar voltage drops on region 2, the fixed voltage-controlled voltage reference value of DC/DC converter B, its choosing value is positioned at region 2, i.e. U 1< U ref2< U 2;
I max2-DC/DC converter B current regulator allows the current maxima of passing through;
P max2-DC/DC converter B power control loop allows the maximum power of sending;
U ref_abthe voltage reference value of-DC/DC converter C voltage control loop;
I sc_refthe reference value of the super capacitor charging and discharging currents of-setting;
P max3-DC/DC converter C power control loop allows the maximum power of sending;
U ucthe terminal voltage of-super capacitor;
U minthe smallest end voltage that-super capacitor allows;
U maxthe maximum terminal voltage that-super capacitor allows;
Step 2 ?5: when DC bus-bar voltage drops on region 3, i.e. U 3< U dC< U 2time, DC/DC converter A is operated in MPPT pattern, and DC/DC converter B is operated in permanent power control mode, and the voltage reference value of its voltage control loop is got U ' ref-ab, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I max2and P max2; DC/DC converter C is operated in and determines voltage mode control, and the reference voltage of its voltage control loop is got U ref3, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I max3and P max3;
Wherein:
U ' ref-abthe voltage reference value of-DC/DC converter B voltage control loop;
U ref3when-DC bus-bar voltage drops on region 3, the fixed voltage-controlled voltage reference value of DC/DC converter C, its choosing value is positioned at region 3, i.e. U 3<U ref3<U 2;
I max3-DC/DC converter C current regulator allows the current maxima of passing through;
Step 2 ?6: when DC bus-bar voltage drops on region 4, i.e. U 4< U dC< U 3time, DC/DC converter A is operated in MPPT pattern, and the DC/DC converter B of lithium battery system is operated in and determines voltage mode control, and the voltage reference value of its voltage control loop is got U ref4, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I max2and P max2; DC/DC converter C is operated in constant current charge control model, and the reference voltage of its voltage control loop is got U ref_ab, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I sc_refand P max3, in this process, the terminal voltage U of tuning controller Real-Time Monitoring super capacitor ucif U detected min<U uc<U max, proceed to step 2 ?5 operation;
Wherein:
U 4the maximum U that-DC bus-bar voltage allows 0> U 1> U 2> U 3> U 4;
U ref4when-DC bus-bar voltage drops on region 4, the fixed voltage-controlled voltage reference value of DC/DC converter B, its choosing value should drop in region 4, i.e. U 4<U ref4<U 3.
In described step 3, AC DC/AC converter adopts motor synchronizing voltage source to control, introduce virtual impedance control and double mode seamless switching controls simultaneously, and the normalized to above-mentioned control model, so that distributed power source is when being incorporated to the micro-electrical network of mesolow, can with inverter type distributed power source or conventional synchronization motor-type distributed power source group net operation in parallel.
During motor synchronizing voltage source is controlled, three-phase voltage and the electric current of the output of Real-time Collection DC/AC converter, according to instantaneous power theory, calculate active-power P and the reactive power Q of the output of DC/AC converter, adopt motor synchronizing voltage source to control, calculate the reference frequency f of the virtual output voltage phasor of DC/AC converter vir_refwith reference amplitude V vir_ref:
f vir - ref = f * - m ( P * - P ) V vir - ref = V * - n ( Q * - Q ) - - - ( 2 - 1 )
Wherein:
F vir_refthe reference frequency of the virtual output voltage phasor of-DC/AC converter;
V vir_refthe reference amplitude of the virtual output voltage phasor of-DC/AC converter;
F *the reference frequency of-mixed energy storage system rated voltage;
V *the reference amplitude of-mixed energy storage system rated voltage;
The sagging coefficient that m-meritorious/frequency droop is controlled;
The sagging coefficient of n-REACTIVE POWER/VOLTAGE droop control;
P *-DC/AC converter is at f *the active power reference value of lower output;
Q *-DC/AC converter is at V *the reactive power reference qref of lower output;
The active power that P-DC/AC converter sends;
The reactive power that Q-DC/AC converter sends;
M and n through type (2 ?2) calculate:
m = f min - f * P max - P * n = V min - V * Q max - Q * - - - ( 2 - 2 )
Wherein:
F minthe minimum operation frequency that-mixed energy storage system allows;
V minthe minimum operation voltage that-mixed energy storage system allows;
P maxthe maximum active power that-converter can be exported;
Q maxthe maximum reactive power that-converter can be exported;
During virtual impedance is controlled, according to formula (2 ?3), calculate
V vir _ ref &CenterDot; = V vir _ ref &angle; &theta; vir _ ref &theta; vir _ ref = 2 &pi; &Integral; 0 t f vir _ ref dt - - - ( 2 - 3 )
V ref &CenterDot; = V vir _ ref &CenterDot; - I &CenterDot; Z vir - - - ( 2 - 4 )
In formula:
the reference phasor of the virtual output voltage phasor of converter;
the reference phasor of converter output voltage phasor;
the electric current phasor that converter sends;
Z vir-virtual impedance.
During double mode seamless switching is controlled,
When distributed power source detects large electric network fault, grid-connected switch disconnects, f *and V *set-point by frequency and the amplitude of line voltage, change into the set point under independent operation mode;
When the fault clearance of large electrical network, distributed power source is converted to while being incorporated into the power networks pattern by independent operation mode, and the motor synchronizing that starts distributed power source is controlled, when meeting grid-connected condition, closed grid-connected switch, is incorporated into the power networks distributed power source, to reduce the grid-connected impact to electrical network of distributed power source.
During motor synchronizing is controlled, the frequency adjusted value of DC/AC converter output voltage phasor and range-adjusting value through type (2 ?5) calculate:
&Delta;f = ( K p 1 + K i 1 s ) ( f g - f i ) &Delta;U = ( K p 2 + K i 2 s ) ( U g - U i ) - - - ( 2 - 5 )
Wherein:
The frequency adjusted value of Δ f-DC/AC converter output voltage phasor;
The range-adjusting value of Δ U-DC/AC converter output voltage phasor;
K p1the proportional control factor of-DC/AC frequency inverter Synchronization Control;
K i1the integral adjustment coefficient of-DC/AC frequency inverter Synchronization Control;
K p2-DC/AC converter voltage magnitude is followed the tracks of the proportional control factor in controlling;
K i2-DC/AC converter voltage magnitude is followed the tracks of the integral adjustment coefficient in controlling;
U gthe amplitude of-line voltage phasor;
U ithe amplitude of the voltage phasor that-DC/AC converter sends.
Compared with prior art, beneficial effect of the present invention is:
1. can be applicable to the grid-connected operation of distributed power source and control, reduce the impact of batch (-type) renewable energy source power on electrical network, make distributed power source according to higher level's dispatch command with scheduling Power operation, and can automatically participate in frequency, the voltage-regulation of electrical network, improve the receiving ability of electrical network to distribution type renewable energy generating, realized energy conservation and environmental protection benefit;
2. can be applicable to from operation and the control of distributed power source in the micro-electrical network of net type, make distributed power source can be used as the networking unit of micro-electrical network, with the common all load powers of subsystem of conventional electric generators, other inverter type distributed power sources, maintain the stable of frequency in electrical network and voltage;
3. can be applicable to the dual mode operated micro-electrical network of grid-connected/isolated island, realize two kinds of seamless switchings under pattern, improve the power supply reliability of load;
4. the operation that can be applicable to mixed energy storage system is controlled, can optimum management storage battery and the charge and discharge process of super capacitor, improve the course of work of storage battery, and reduce its charge and discharge cycles number of times and maximum depth of discharge, extend the useful life of energy-storage system;
5. operation and the control of the DC power-supply system that can be applicable to comprise renewable energy power generation and energy-storage system, can stable DC busbar voltage, maintains the stable operation of system.
Accompanying drawing explanation
Fig. 1 coordinates the control flow chart of control between DC power-supply system each several part in the embodiment of the present invention;
Fig. 2 is the topology diagram of the friendly type distributed power source of the electrical network based on hybrid energy-storing in the embodiment of the present invention;
Fig. 3 is DC/DC converter plurality of operating modes normalization control chart in the embodiment of the present invention;
Fig. 4 is distributed power source DC bus-bar voltage traffic coverage schematic diagram in the embodiment of the present invention;
Fig. 5 is the electrical network adaptive control flow chart of AC DC/DC converter in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As Fig. 1, the control method of the friendly type distributed power source of a kind of electrical network based on hybrid energy-storing is provided, said method comprising the steps of:
Step 1: the topological structure of optimal design distributed power source;
Step 2: coordinate to control DC power-supply system by DC/DC convertor controls pattern normalization model;
Step 3: the electrical network adaptive control of AC DC/AC converter.
As Fig. 2, in the topological structure of distributed power source, intermittent renewable energy system, lithium battery energy storage battery system and super capacitor energy-storage system are in parallel with DC bus by DC/DC converter A, DC/DC converter B and DC/DC converter C respectively, form the DC power-supply system of distributed power source, this DC power-supply system is connected with AC system by AC DC/AC converter, forms distributed power source.
In described step 2, DC/DC converter comprises DC/DC converter A, DC/DC converter B and DC/DC converter C; DC/DC converter A is unidirectional DC/DC converter, and DC/DC converter B and DC/DC converter C are two-way DC/DC converter.The control model of DC/DC converter comprises determines voltage mode control, constant current control model and permanent power control mode; Choosing of power magnitude limit value by the instruction of voltage control loop reference power, current regulator current amplitude limit value and power control loop, determines above-mentioned different control model; Constant current control model comprises constant current charge control model and constant current discharge control model.
As Fig. 3, in described DC/DC convertor controls pattern normalization model, the difference of the reference value of busbar voltage and its measured value regulates through PI, pass through again current limit link, obtain the reference value of energy-storage system output current, the difference of energy-storage system output current reference value and its output current measured value regulates through PI, and then by power limiting link, obtain the reference value of energy-storage system power output, as the switch triggering signal of DC/DC converter; Described energy-storage system comprises lithium battery energy storage battery system and super capacitor energy-storage system.
As Fig. 4, described step 2 comprises the following steps:
Step 2 ?1: tuning controller is measured DC bus-bar voltage U in real time dC, the state-of-charge of lithium battery and the terminal voltage of super capacitor, and according to Monitoring Data, determine the control model of DC/DC converter;
Step 2 ?2: tuning controller is measured the load power P of the friendly type distributed power source of described electrical network in real time lpower output P with intermittent renewable energy system r, calculate the power shortage P of described mixed energy storage system s, P s=P l-P r, and extract P sin low frequency component P b_ref, described P b_reffor the value and power reference of permanent power control mode lithium battery energy storage battery system, P lfor the load power of distributed power source, P rpower output for intermittent renewable energy system;
Step 2 ?3: when DC bus-bar voltage drops on region 1, i.e. U 0< U dC< U 1time, DC/DC converter A is operated in and determines voltage mode control, and its reference voltage is got U ref1, the current amplitude limit value of current regulator and the power magnitude limit value of power control loop are got respectively I max1and P max1; DC/DC converter B and DC/DC converter C do not work;
Wherein: U 0the maximum that-DC bus-bar voltage allows;
U dCthe real-time measurement values of-DC bus-bar voltage;
U ref1when-DC bus-bar voltage drops on region 1, the fixed voltage-controlled voltage reference value of DC/DC converter A, its choosing value is positioned at region 1, i.e. U 0< U ref1< U 1;
I max1-DC/DC converter A current regulator allows the current maxima of passing through;
P max1-DC/DC converter A power control loop allows the maximum power of sending;
Step 2 ?4: when DC bus-bar voltage drops on region 2, i.e. U 2< U dC< U 1time, DC/DC converter A is operated in MPPT control model, and DC/DC converter B is operated in and determines voltage mode control, and its reference voltage is got U ref2, the current amplitude limit value of current regulator and the power magnitude limit value of power control loop are got respectively I max2and P max2; DC/DC converter C is operated in constant current discharge control model, and the reference voltage of its voltage control loop is got U ref_ab, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I sc_refand P max3; In this process, the terminal voltage U of tuning controller Real-Time Monitoring super capacitor ucif U detected min<U uc<U max, proceed to step 2 ?5 operation;
Wherein: U ref2when-DC bus-bar voltage drops on region 2, the fixed voltage-controlled voltage reference value of DC/DC converter B, its choosing value is positioned at region 2, i.e. U 1< U ref2< U 2;
I max2-DC/DC converter B current regulator allows the current maxima of passing through;
P max2-DC/DC converter B power control loop allows the maximum power of sending;
U ref_abthe voltage reference value of-DC/DC converter C voltage control loop;
I sc_refthe reference value of the super capacitor charging and discharging currents of-setting;
P max3-DC/DC converter C power control loop allows the maximum power of sending;
U ucthe terminal voltage of-super capacitor;
U minthe smallest end voltage that-super capacitor allows;
U maxthe maximum terminal voltage that-super capacitor allows;
Step 2 ?5: when DC bus-bar voltage drops on region 3, i.e. U 3< U dC< U 2time, DC/DC converter A is operated in MPPT pattern, and DC/DC converter B is operated in permanent power control mode, and the voltage reference value of its voltage control loop is got U ' ref-ab, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I max2and P max2; DC/DC converter C is operated in and determines voltage mode control, and the reference voltage of its voltage control loop is got U ref3, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I max3and P max3;
Wherein:
U ' ref-abthe voltage reference value of-DC/DC converter B voltage control loop;
U ref3when-DC bus-bar voltage drops on region 3, the fixed voltage-controlled voltage reference value of DC/DC converter C, its choosing value is positioned at region 3, i.e. U 3<U ref3<U 2;
I max3-DC/DC converter C current regulator allows the current maxima of passing through;
Step 2 ?6: when DC bus-bar voltage drops on region 4, i.e. U 4< U dC< U 3time, DC/DC converter A is operated in MPPT pattern, and the DC/DC converter B of lithium battery system is operated in and determines voltage mode control, and the voltage reference value of its voltage control loop is got U ref4, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I max2and P max2; DC/DC converter C is operated in constant current charge control model, and the reference voltage of its voltage control loop is got U ref_ab, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I sc_refand P max3, in this process, the terminal voltage U of tuning controller Real-Time Monitoring super capacitor ucif U detected min<U uc<U max, proceed to step 2 ?5 operation;
Wherein:
U 4the maximum U that-DC bus-bar voltage allows 0> U 1> U 2> U 3> U 4;
U ref4when-DC bus-bar voltage drops on region 4, the fixed voltage-controlled voltage reference value of DC/DC converter B, its choosing value should drop in region 4, i.e. U 4<U ref4<U 3.
As Fig. 5, AC DC/AC converter adopts motor synchronizing voltage source to control, introduce virtual impedance control and double mode seamless switching controls simultaneously, and the normalized to above-mentioned control model, so that distributed power source is when being incorporated to the micro-electrical network of mesolow, can with inverter type distributed power source or conventional synchronization motor-type distributed power source group net operation in parallel.
During motor synchronizing voltage source is controlled, three-phase voltage and the electric current of the output of Real-time Collection DC/AC converter, according to instantaneous power theory, calculate active-power P and the reactive power Q of the output of DC/AC converter, adopt motor synchronizing voltage source to control, calculate the reference frequency f of the virtual output voltage phasor of DC/AC converter vir_refwith reference amplitude V vir_ref:
f vir - ref = f * - m ( P * - P ) V vir - ref = V * - n ( Q * - Q ) - - - ( 2 - 1 )
Wherein:
F vir_refthe reference frequency of the virtual output voltage phasor of-DC/AC converter;
V vir_refthe reference amplitude of the virtual output voltage phasor of-DC/AC converter;
F *the reference frequency of-mixed energy storage system rated voltage;
V *the reference amplitude of-mixed energy storage system rated voltage;
The sagging coefficient that m-meritorious/frequency droop is controlled;
The sagging coefficient of n-REACTIVE POWER/VOLTAGE droop control;
P *-DC/AC converter is at f *the active power reference value of lower output;
Q *-DC/AC converter is at V *the reactive power reference qref of lower output;
The active power that P-DC/AC converter sends;
The reactive power that Q-DC/AC converter sends;
When distributed power source is when being incorporated into the power networks pattern, f *, V *for frequency and the magnitude of voltage of electrical network, when distributed power source is during in independent operation mode, f *, V *for the reference value of setting, in the system of 380V, generally get 50Hz, 380V.
M and n through type (2 ?2) calculate:
m = f min - f * P max - P * n = V min - V * Q max - Q * - - - ( 2 - 2 )
Wherein:
F minthe minimum operation frequency that-mixed energy storage system allows;
V minthe minimum operation voltage that-mixed energy storage system allows;
P maxthe maximum active power that-converter can be exported;
Q maxthe maximum reactive power that-converter can be exported;
During virtual impedance is controlled, according to formula (2 ?3), calculate
V vir _ ref &CenterDot; = V vir _ ref &angle; &theta; vir _ ref &theta; vir _ ref = 2 &pi; &Integral; 0 t f vir _ ref dt - - - ( 2 - 3 )
V ref &CenterDot; = V vir _ ref &CenterDot; - I &CenterDot; Z vir - - - ( 2 - 4 )
In formula:
the reference phasor of the virtual output voltage phasor of converter;
the reference phasor of converter output voltage phasor;
the electric current phasor that converter sends;
Z vir-virtual impedance.
During double mode seamless switching is controlled,
When distributed power source detects large electric network fault, grid-connected switch disconnects, f *and V *set-point by frequency and the amplitude of line voltage, change into the set point under independent operation mode;
Fault clearance when large electrical network, distributed power source is converted to while being incorporated into the power networks pattern by independent operation mode, switch L1 and L2 in closed Fig. 5, the motor synchronizing that starts distributed power source is controlled, when meeting grid-connected condition, closed grid-connected switch, is incorporated into the power networks distributed power source, to reduce the grid-connected impact to electrical network of distributed power source.
During motor synchronizing is controlled, the frequency adjusted value of DC/AC converter output voltage phasor and range-adjusting value through type (2 ?5) calculate:
&Delta;f = ( K p 1 + K i 1 s ) ( f g - f i ) &Delta;U = ( K p 2 + K i 2 s ) ( U g - U i ) - - - ( 2 - 5 )
Wherein:
The frequency adjusted value of Δ f-DC/AC converter output voltage phasor;
The range-adjusting value of Δ U-DC/AC converter output voltage phasor;
K p1the proportional control factor of-DC/AC frequency inverter Synchronization Control;
K i1the integral adjustment coefficient of-DC/AC frequency inverter Synchronization Control;
K p2-DC/AC converter voltage magnitude is followed the tracks of the proportional control factor in controlling;
K i2-DC/AC converter voltage magnitude is followed the tracks of the integral adjustment coefficient in controlling;
U gthe amplitude of-line voltage phasor;
U ithe amplitude of the voltage phasor that-DC/AC converter sends.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.

Claims (8)

1. a control method for the friendly type distributed power source of the electrical network based on hybrid energy-storing, is characterized in that: said method comprising the steps of:
Step 1: the topological structure of optimal design distributed power source;
Step 2: coordinate to control DC power-supply system by DC/DC convertor controls pattern normalization model;
Step 3: the electrical network adaptive control of AC DC/AC converter;
In described DC/DC convertor controls pattern normalization model, the difference of the reference value of busbar voltage and its measured value regulates through PI, pass through again current limit link, obtain the reference value of energy-storage system output current, the difference of energy-storage system output current reference value and its output current measured value regulates through PI, and then by power limiting link, obtain the reference value of energy-storage system power output, as the switch triggering signal of DC/DC converter; Described energy-storage system comprises lithium battery energy storage battery system and super capacitor energy-storage system.
2. the control method of the friendly type distributed power source of electrical network based on hybrid energy-storing according to claim 1, it is characterized in that: in the topological structure of the distributed power source of described step 1, intermittent renewable energy system, lithium battery energy storage battery system and super capacitor energy-storage system are in parallel with DC bus by DC/DC converter A, DC/DC converter B and DC/DC converter C respectively, form the DC power-supply system of distributed power source, this DC power-supply system is connected with AC system by AC DC/AC converter, forms distributed power source.
3. the control method of the friendly type distributed power source of the electrical network based on hybrid energy-storing according to claim 1, is characterized in that: in described step 2, DC/DC converter comprises DC/DC converter A, DC/DC converter B and DC/DC converter C; The control model of DC/DC converter comprises determines voltage mode control, constant current control model and permanent power control mode; Choosing of power magnitude limit value by voltage control loop voltage reference value, current regulator current amplitude limit value and power control loop, determines above-mentioned different control model; Constant current control model comprises constant current charge control model and constant current discharge control model.
4. the control method of the friendly type distributed power source of electrical network based on hybrid energy-storing according to claim 1, is characterized in that: described step 2 comprises the following steps:
Step 2 ?1: tuning controller is measured DC bus-bar voltage U in real time dC, the state-of-charge of lithium battery and the terminal voltage of super capacitor, and according to Monitoring Data, determine the control model of DC/DC converter;
Step 2 ?2: tuning controller is measured the load power P of the friendly type distributed power source of described electrical network in real time lpower output P with intermittent renewable energy system r, the power shortage P of calculating mixed energy storage system s, P s=P l-P r, and extract P sin low frequency component P b_ref; Described P b_reffor the value and power reference of permanent power control mode lithium battery energy storage battery system, P lfor the load power of distributed power source, P rpower output for intermittent renewable energy system;
Step 2 ?3: when DC bus-bar voltage drops on region 1, i.e. U 0< U dC< U 1time, DC/DC converter A is operated in and determines voltage mode control, and its reference voltage is got U ref1, the current amplitude limit value of current regulator and the power magnitude limit value of power control loop are got respectively I max1and P max1; DC/DC converter B and DC/DC converter C do not work;
Wherein: U 0the maximum that-DC bus-bar voltage allows;
U dCthe real-time measurement values of-DC bus-bar voltage;
U ref1when-DC bus-bar voltage drops on region 1, the fixed voltage-controlled voltage reference value of DC/DC converter A, its choosing value is positioned at region 1, i.e. U 0< U ref1< U 1;
I max1-DC/DC converter A current regulator allows the current maxima of passing through;
P max1-DC/DC converter A power control loop allows the maximum power of sending;
Step 2 ?4: when DC bus-bar voltage drops on region 2, i.e. U 2< U dC< U 1time, DC/DC converter A is operated in MPPT control model, and DC/DC converter B is operated in and determines voltage mode control, and its reference voltage is got U ref2, the current amplitude limit value of current regulator and the power magnitude limit value of power control loop are got respectively I max2and P max2; DC/DC converter C is operated in constant current discharge control model, and the reference voltage of its voltage control loop is got U ref_ab, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I sc_refand P max3; In this process, the terminal voltage Uuc of tuning controller Real-Time Monitoring super capacitor, if detect U min<U uc<U max, proceed to step 2 ?5 operation;
Wherein: U ref2when-DC bus-bar voltage drops on region 2, the fixed voltage-controlled voltage reference value of DC/DC converter B, its choosing value is positioned at region 2, i.e. U 1< U ref2< U 2;
I max2-DC/DC converter B current regulator allows the current maxima of passing through;
P max2-DC/DC converter B power control loop allows the maximum power of sending;
U ref_abthe voltage reference value of-DC/DC converter C voltage control loop;
I sc_refthe reference value of the super capacitor charging and discharging currents of-setting;
P max3-DC/DC converter C power control loop allows the maximum power of sending;
U ucthe terminal voltage of-super capacitor;
U minthe smallest end voltage that-super capacitor allows;
U maxthe maximum terminal voltage that-super capacitor allows;
Step 2 ?5: when DC bus-bar voltage drops on region 3, i.e. U 3< U dC< U 2time, DC/DC converter A is operated in MPPT pattern, and DC/DC converter B is operated in permanent power control mode, and the voltage reference value of its voltage control loop is got U ' ref-ab, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I max2and P max2; DC/DC converter C is operated in and determines voltage mode control, and the reference voltage of its voltage control loop is got U ref3, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I max3and P max3;
Wherein:
U ' ref-abthe voltage reference value of-DC/DC converter B voltage control loop;
U ref3when-DC bus-bar voltage drops on region 3, the fixed voltage-controlled voltage reference value of DC/DC converter C, its choosing value is positioned at region 3, i.e. U 3<U ref3<U 2;
I max3-DC/DC converter C current regulator allows the current maxima of passing through;
Step 2 ?6: when DC bus-bar voltage drops on region 4, i.e. U 4< U dC< U 3time, DC/DC converter A is operated in MPPT pattern, and the DC/DC converter B of lithium battery system is operated in and determines voltage mode control, and the voltage reference value of its voltage control loop is got U ref4, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I max2and P max2; DC/DC converter C is operated in constant current charge control model, and the reference voltage of its voltage control loop is got U ref_ab, the amplitude limit value of current regulator and the amplitude limit value of power control loop are got respectively I sc_refand P max3, in this process, the terminal voltage U of tuning controller Real-Time Monitoring super capacitor ucif U detected min<U uc<U max, proceed to step 2 ?5 operation;
Wherein:
U 4the maximum U that-DC bus-bar voltage allows 0> U 1> U 2> U 3> U 4;
U ref4when-DC bus-bar voltage drops on region 4, the fixed voltage-controlled voltage reference value of DC/DC converter B, its choosing value should drop in region 4, i.e. U 4<U ref4<U 3.
5. the control method of the friendly type distributed power source of electrical network based on hybrid energy-storing according to claim 1, it is characterized in that: in described step 3, AC DC/AC converter adopts motor synchronizing voltage source to control, introduce virtual impedance control and double mode seamless switching controls simultaneously, and the normalized to above-mentioned control model, so that distributed power source is when being incorporated to the micro-electrical network of mesolow, can with inverter type distributed power source or conventional synchronization motor-type distributed power source group net operation in parallel.
6. the control method of the friendly type distributed power source of electrical network based on hybrid energy-storing according to claim 5, it is characterized in that: during motor synchronizing voltage source is controlled, three-phase voltage and the electric current of the output of Real-time Collection DC/AC converter, according to instantaneous power theory, calculate active-power P and the reactive power Q of the output of DC/AC converter, adopt motor synchronizing voltage source to control, calculate the reference frequency f of the virtual output voltage phasor of DC/AC converter vir_refwith reference amplitude V vir_ref:
f vir - ref = f * - m ( P * - P ) V vir - ref = V * - n ( Q * - Q ) - - - ( 2 - 1 )
Wherein:
F vir_refthe reference frequency of the virtual output voltage phasor of-DC/AC converter;
V vir_refthe reference amplitude of the virtual output voltage phasor of-DC/AC converter;
F *the reference frequency of-mixed energy storage system rated voltage;
V *the reference amplitude of-mixed energy storage system rated voltage;
The sagging coefficient that m-meritorious/frequency droop is controlled;
The sagging coefficient of n-REACTIVE POWER/VOLTAGE droop control;
P *-DC/AC converter is at f *the active power reference value of lower output;
Q *-DC/AC converter is at V *the reactive power reference qref of lower output;
The active power that P-DC/AC converter sends;
The reactive power that Q-DC/AC converter sends;
M and n through type (2 ?2) calculate:
m = f min - f * P max - P * n = V min - V * Q max - Q * - - - ( 2 - 2 )
Wherein:
F minthe minimum operation frequency that-mixed energy storage system allows;
V minthe minimum operation voltage that-mixed energy storage system allows;
P maxthe maximum active power that-converter can be exported;
Q maxthe maximum reactive power that-converter can be exported.
7. the control method of the friendly type distributed power source of electrical network based on hybrid energy-storing according to claim 5, is characterized in that: during virtual impedance is controlled, according to formula (2 ?3), calculate
V vir _ ref &CenterDot; = V vir _ ref &angle; &theta; vir _ ref &theta; vir _ ref = 2 &pi; &Integral; 0 t f vir _ ref dt - - - ( 2 - 3 )
V ref &CenterDot; = V vir _ ref &CenterDot; - I &CenterDot; Z vir - - - ( 2 - 4 )
In formula:
the reference phasor of the virtual output voltage phasor of converter;
the reference phasor of converter output voltage phasor;
the electric current phasor that converter sends;
Z vir-virtual impedance.
8. the control method of the friendly type distributed power source of electrical network based on hybrid energy-storing according to claim 5, is characterized in that: during double mode seamless switching is controlled,
When distributed power source detects large electric network fault, grid-connected switch disconnects, f *and V *set-point by frequency and the amplitude of line voltage, change into the set point under independent operation mode;
When the fault clearance of large electrical network, distributed power source is converted to while being incorporated into the power networks pattern by independent operation mode, and the motor synchronizing that starts distributed power source is controlled, when meeting grid-connected condition, closed grid-connected switch, is incorporated into the power networks distributed power source, to reduce the grid-connected impact to electrical network of distributed power source.
CN201210460689.7A 2012-11-15 2012-11-15 Control method of grid friendly type distributed power source based on hybrid energy storage CN102983589B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210460689.7A CN102983589B (en) 2012-11-15 2012-11-15 Control method of grid friendly type distributed power source based on hybrid energy storage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210460689.7A CN102983589B (en) 2012-11-15 2012-11-15 Control method of grid friendly type distributed power source based on hybrid energy storage

Publications (2)

Publication Number Publication Date
CN102983589A CN102983589A (en) 2013-03-20
CN102983589B true CN102983589B (en) 2014-10-22

Family

ID=47857408

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201210460689.7A CN102983589B (en) 2012-11-15 2012-11-15 Control method of grid friendly type distributed power source based on hybrid energy storage

Country Status (1)

Country Link
CN (1) CN102983589B (en)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103257299A (en) * 2013-05-20 2013-08-21 国家电网公司 Microgrid technical verification platform device based on hybrid energy storage
CN104280624A (en) * 2013-07-10 2015-01-14 北京中电建投微电网科技有限公司 Multifunctional intelligent micro-grid application platform
CN103419680B (en) * 2013-07-29 2015-08-19 华北电力大学(保定) A kind of DC traction power-supply system based on distributed power source
CN104426157B (en) 2013-09-10 2017-04-19 台达电子企业管理(上海)有限公司 Energy storage module and energy storage device
CN103501017B (en) * 2013-09-26 2015-11-25 北京北变微电网技术有限公司 Microgrid stabilization controller
CN105207258B (en) * 2013-10-11 2019-06-04 国网河南省电力公司南阳供电公司 A kind of photovoltaic direct-current micro-grid energy cooperative control device
CN103580291B (en) * 2013-11-27 2015-09-30 上海空间电源研究所 Take into account battery energy storage system and the control method thereof of energy type power-type
CN103580046B (en) * 2013-11-27 2016-02-03 上海空间电源研究所 A kind of composite energy storage matching method for active distribution network
AU2014377330B2 (en) 2014-01-13 2018-02-08 Abb Power Grids Switzerland Ag Control of a stabilizing energy storage in a microgrid
CN103944187A (en) * 2014-04-25 2014-07-23 广东工业大学 Micro-grid subnet structure and control method with constant and time-sharing output impedance
CN104078978B (en) * 2014-07-02 2016-01-20 江苏大学 A kind of electric automobile networking primary frequency modulation control method of smart grid-oriented
CN104333964B (en) * 2014-10-17 2017-06-23 武汉凌云光电科技有限责任公司 The control circuit and control method of a kind of pulse xenon lamp power source
CN105826917B (en) * 2015-01-04 2019-10-08 通用电气公司 Power conversion system and its control method and wind turbine electricity generating system
CN104716835A (en) * 2015-01-23 2015-06-17 同济大学 Bidirectional direct current converter based on super-capacitor and accumulator hybrid energy storage system of Buck/Boost circuit and control method thereof
WO2016134319A1 (en) 2015-02-19 2016-08-25 Enphase Energy, Inc. Method and apparatus for time-domain droop control with integrated phasor current control
CN104810845B (en) * 2015-04-15 2017-10-20 国网冀北电力有限公司电力科学研究院 Distributed light energy storage participates in bus regulation adaptive controller and method
CN104821607B (en) * 2015-05-15 2017-03-15 东北大学 A kind of photovoltaic micro Power balance control method based on three end Collaborative Control
CN104810822B (en) * 2015-05-22 2017-11-07 中国电力科学研究院 A kind of two-way DC/DC of microgrid changes the control method of sagging coefficient
CN104868502B (en) * 2015-06-16 2018-07-17 北京亿利智慧能源科技有限公司 A kind of distributed photovoltaic inverter control method suitable for micro-capacitance sensor
CN105071393B (en) * 2015-09-08 2018-08-03 许继集团有限公司 A kind of alternating current-direct current mixing micro-capacitance sensor direct current bus voltage control method
CN105591382A (en) * 2015-11-12 2016-05-18 国家电网公司 Network source coordination power control method of isolated photovoltaic direct current microgrid
CN105870911B (en) * 2016-05-17 2018-05-15 国网浙江省电力公司电力科学研究院 A kind of direct-current grid multi-source control method for coordinating
CN106058864B (en) * 2016-07-08 2018-04-24 东南大学 A kind of power grid friendly equipment participates in the control method of power grid frequency modulation
CN106451717B (en) * 2016-09-12 2018-10-19 浙江工业大学 A kind of accumulator and super capacitor mixed energy storage system charge and discharge process method for handover control
CN108023366B (en) * 2018-01-25 2020-03-31 南京工程学院 Method for preventing overvoltage of neutral point of main transformer for high-permeability photovoltaic
CN108565887A (en) * 2018-01-31 2018-09-21 湖北工业大学 Energy storage link maintains micro-capacitance sensor busbar voltage subregion curve dynamic droop control method
CN110224435A (en) * 2019-06-19 2019-09-10 广东志成冠军集团有限公司 A kind of island power supply system capacity control method containing hybrid energy-storing

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101969281A (en) * 2010-10-14 2011-02-09 北京四方继保自动化股份有限公司 Coordination control and optimization method for battery energy accumulation and photovoltaic power generation based on co-direct current bus
CN102157956A (en) * 2011-03-01 2011-08-17 国网电力科学研究院 Virtual-impedance-based inverter parallel running method
CN102545260A (en) * 2012-01-16 2012-07-04 中国电力科学研究院 Method for controlling automatic seamless switching between grid-connected mode and grid-isolated mode of microgrid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101969281A (en) * 2010-10-14 2011-02-09 北京四方继保自动化股份有限公司 Coordination control and optimization method for battery energy accumulation and photovoltaic power generation based on co-direct current bus
CN102157956A (en) * 2011-03-01 2011-08-17 国网电力科学研究院 Virtual-impedance-based inverter parallel running method
CN102545260A (en) * 2012-01-16 2012-07-04 中国电力科学研究院 Method for controlling automatic seamless switching between grid-connected mode and grid-isolated mode of microgrid

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
分布式电源和微网在智能配电网自愈功能中的作用分析;战杰等;《山东电力高等专科学校学报》;20100228;第13卷(第2期);33-36 *
战杰等.分布式电源和微网在智能配电网自愈功能中的作用分析.《山东电力高等专科学校学报》.2010,第13卷(第2期),33-36.

Also Published As

Publication number Publication date
CN102983589A (en) 2013-03-20

Similar Documents

Publication Publication Date Title
Wang et al. Energy management system for stand-alone diesel-wind-biomass microgrid with energy storage system
Abusara et al. Line-interactive UPS for microgrids
De Matos et al. Power control in ac isolated microgrids with renewable energy sources and energy storage systems
CN104184159B (en) The cooperative scheduling strategy of polynary energy storage in light storage distributed micro-grid system
CN102738836B (en) Alternating current and direct current hybrid micro power grid system and control method thereof
Zhao et al. Next-generation multi-functional modular intelligent UPS system for smart grid
CN104319816B (en) A kind of light storage alternating current-direct current mixing micro-grid system and control method thereof
CN102916440B (en) Battery energy storage system based power conversion system and control method thereof
CN104810858B (en) A kind of light stores up the control method of micro-grid connection electricity generation system
CN104065157B (en) Uninterruptible power supply with improved power supply reliability
CN102856924B (en) Microgrid smooth switch control method based on composite energy storage
CN103647274B (en) A kind of for can the energy control method of grid-connected and micro-grid system from network operation
CN103545905B (en) A kind of photovoltaic direct-current micro-grid energy coordination control method
CN102916481B (en) A kind of energy management method of direct current micro-grid system
CN102931687B (en) Power adjustment method for hybrid energy storage photovoltaic power station
Ge et al. Energy storage system-based power control for grid-connected wind power farm
CN104022528B (en) A kind of microgrid system coordination control method based on multiple elements design energy storage
CN101309017B (en) Wind power and photovoltaic power complementary power supply system based on mixed energy accumulation of super capacitor accumulator
CN102624018B (en) Distributed hybrid power supply intelligent grid system and control method
CN104659804B (en) Micro-capacitance sensor containing hybrid energy-storing and its control method
CN102377192B (en) Direct-driving wave power-generating and energy-storing device and control method
CN103647302B (en) Double-layer coordinating and controlling method of multi-sub microgrid-contained mixed microgrid system
CN103427430B (en) A kind of energy management method of mixed energy storage system in microgrid
CN102510089B (en) Wind and solar micro power grid system
CN104810857B (en) Single-phase grid-connected photovoltaic power generation system output power smooth control device and control method

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant