CN104242328A - Energy storage control method based on impedance detection - Google Patents
Energy storage control method based on impedance detection Download PDFInfo
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- CN104242328A CN104242328A CN201410447153.0A CN201410447153A CN104242328A CN 104242328 A CN104242328 A CN 104242328A CN 201410447153 A CN201410447153 A CN 201410447153A CN 104242328 A CN104242328 A CN 104242328A
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Abstract
The invention provides an energy storage control method based on impedance detection. The new energy storage control method is introduced, stored energy can supply power to a system when a major network breaks down by developing reasonable control strategies, synchronization of energy storage is achieved after the major network is recovered, and rapid cutting can be carried out after energy storage faults; through application of the energy storage control method, the power supply reliability of a power grid can be improved, the stored energy application field is further expanded, and loads of the power grid are relieved. The impedance detection principle is adopted in the energy storage control method, so that the energy storage system is more effectively and rapidly controlled, and the load power supply stability is effectively guaranteed; meanwhile, the power grid construction can be reduced, the power fluctuation can be smoothened, and the positive effect is played on guaranteeing the safety of the power grid.
Description
Technical field
The invention belongs to energy storage control field, especially relates to a kind of energy storage control method based on impedance detection.
Background technology
Current energy source situation is nervous, and environmental pollution is serious, carries out electric network reconstruction, alleviates mains supply pressure and become important topic.Along with the continuous growth of load, it proposes requirements at the higher level to the quality of power supply and power supply reliability.Current energy storage technology, with its store electrical energy, can realize peak load shifting, and the feature of smooth power fluctuation, is more and more subject to the favor of user.Current energy storage mainly contains two kinds and utilizes form: one, as system reserve, is used alone; Its two, jointly form micro-capacitance sensor with distributed power source, conbined usage.For containing the micro-capacitance sensor of energy storage, a lot, part is maturation in its research, and energy storage is used alone and is not subject to enough attention.
Have simple energy-storage system application process in prior art, the function of main its system reserve of application, peak load shifting, the existing implementation the most close with the present invention has two at present.
One, for for being connected to electrical network to the battery energy storage system in cell load supply line, its grid-connected power supply or charging are controlled, first System self-test is passed through, determine that energy-storage system whether can grid-connected work, and whether electrical network trips: when electrical network does not trip, select energy-storage system is powered to the load; When electrical network tripping operation being detected, when losing to cell load power supply capacity, then control energy-storage system and enter isolated island mode of operation, power to cell load incessantly with existing reserves; If after energy-storage system stops powering to the load, can control described energy-storage system immediately carry out grid-connected charging or by the time low power consumption time recharge energy storage.This control method is simple, without fast energy storage island detection method targetedly, and without the differentiation of important load;
They are two years old, for the distributed generator islanding detection method based on impedance measurement, this process employs distributed power source and under net state and lonely net state, to the feature of greatly change be there is in system equiva lent impedance, high-frequency voltage signal is injected in grid-connected contact point, changed by measuring voltage, whether Impedance of reflection changes, just can judge that system is current and be connected with bulk power grid.
Not energy storage island state detection method fast in above technical scheme, conventional measure voltage & current speed is slow, can not Timeliness coverage energy storage island state, its control procedure certainly will be caused to slow down, affect power supply reliability.In addition, stored energy application in the past can not complete the grid-connected strategy of energy storage after fault recovery, and energy storage when initiatively can not complete energy storage fault is exited.
Summary of the invention
The invention will overcome the above problems, a kind of energy storage control method based on impedance detection is provided, break through the method that distributed generator islanding detection is carried out in existing impedance measurement, disclose a kind of energy storage control method based on impedance measurement, the method can fast and effeciently detect energy storage island state, completes control strategy.
For solving the problems of the technologies described above, the technical scheme that the invention adopts is: a kind of energy storage control method based on impedance detection, comprises following control flow:
Step 1: the impedance variation at testing circuit sense switch test point place, if nothing, then continues monitoring; If have, then forward step 2 to;
Step 2: pilot signal is passed to mode controller, this pilot signal is passed to PCS by mode controller, PCS reflected signal, carries out analysis of strategies, judges whether pilot signal meets tactful 1 trigger condition, does not meet, then terminates; Meet, then forward step 3 to;
Step 3: the triggering signal that switch disconnects is passed to mode controller, mode controller control switch disconnects, and feeds back PCS, and the control mode of energy-storage system is converted to PQ by VF;
Step 4: monitoring and protection is to switching point detection, on-load switch point, energy-storage system grid-connected switching point data volume signal feedback to EMS, and EMS judges whether data conform to strategy change, if conform to, then terminates; If do not conform to, then energy storage generation problem, protection act, energy storage switch motion;
Step 5: testing circuit detects switching point detection impedance variation once again, then forward step 6 to;
Step 6: pilot signal is passed to mode controller, this pilot signal is passed to PCS by mode controller, PCS reflected signal, carries out analysis of strategies, judges whether signal meets tactful 2 trigger conditions, does not meet, then terminates; Meet, then forward step 7 to;
Step 7: the triggering signal that switch disconnects is passed to mode controller, mode controller control switch test point switch closes, and feeds back PCS, and the control mode of energy-storage system is converted to VF by PQ, and electrical network normally runs.
Further, described tactful 1 represents PQ control mode, its control objectives is that active power that energy storage is exported and reactive power equal reference power, now electrical network provides the support of microgrid voltage and frequency, when the power that energy storage inverter exports and reference power not etc. time, error signal is non-vanishing, thus pi regulator carries out DAZ gene adjustment, until error signal is zero, the power that namely energy storage inverter exports returns to reference power; Strategy 2 represents VF control mode, its control objectives is that the amplitude of energy storage output voltage and frequency remain unchanged, now energy-storage system is the main power source of micro-grid system, by the change of active power and reactive power reference qref is guaranteed the frequency of system and distributed power source meet ac bus place voltage magnitude equal its reference value respectively.
The advantage that the invention has and good effect are: a kind of energy storage control method based on impedance detection, introduce new energy storage control method, by formulating rational control strategy, can realize energy storage when major network fault is system power supply, and after major network recovers, energy storage realizes grid-connected, and the quick excision after energy storage fault, by the application of this energy storage control method, mains supply reliability can be improved, further expand stored energy application field, alleviate electrical network burden.Energy storage control method of the present invention uses the principle of impedance detection, make energy-storage system control carrying out more efficiently and effectively, effective guarantee load power supply reliability, can reduce power grid construction simultaneously, smooth power fluctuates, and plays positive role exist to guarantee power grid security.
Accompanying drawing explanation
Fig. 1 is a kind of control flow chart of the energy storage control method based on impedance detection;
Fig. 2 is that a kind of energy-storage system based on impedance detection controls schematic diagram;
Fig. 3 is a kind of impedance measurement principle schematic diagram based on adopting in the energy storage control method of impedance detection;
Fig. 4 is energy storage inverter PQ control structure figure;
Fig. 5 energy storage inverter VF control structure figure.
In figure: 1, signal generator; 2, audio frequency amplifier; 3, coupling capacitance; 4, the equivalent power supply of major network; 5, major network impedance; 6, the equivalent power supply of energy-storage system; 7, energy-storage system impedance.
Embodiment
Elaborate below in conjunction with the specific embodiment of accompanying drawing to the invention.
As Figure 1-3, a kind of energy storage control method based on impedance detection, comprises following control flow:
Step 1: the impedance variation at testing circuit sense switch test point A place, if nothing, then continues monitoring; If have, then forward step 2 to;
Step 2: pilot signal is passed to mode controller, this pilot signal is passed to PCS by mode controller, PCS reflected signal, carries out analysis of strategies, judges whether pilot signal meets tactful 1 trigger condition, does not meet, then terminates; Meet, then forward step 3 to;
Step 3: the triggering signal that switch disconnects is passed to mode controller, mode controller control switch disconnects, and feeds back PCS, and the control mode of energy-storage system is converted to PQ by VF;
Step 4: monitoring and protection is to switching point detection A, on-load switch point C, energy-storage system grid-connected switching point B data volume signal feedback to EMS, and EMS judges whether data conform to strategy change, if conform to, then terminates; If do not conform to, then energy storage generation problem, protection act, energy storage switch motion;
Step 5: testing circuit detects switching point detection A impedance variation once again, then forward step 6 to;
Step 6: pilot signal is passed to mode controller, this pilot signal is passed to PCS by mode controller, PCS reflected signal, carries out analysis of strategies, judges whether signal meets tactful 2 trigger conditions, does not meet, then terminates; Meet, then forward step 7 to;
Step 7: the triggering signal that switch disconnects is passed to mode controller, mode controller control switch test point A switch closes, and feeds back PCS, and the control mode of energy-storage system is converted to VF by PQ, and electrical network normally runs.
" end " expression system in flow chart shown in Fig. 1 is current is in stable state; As shown in Figure 4,5, described tactful 1 represents PQ control mode, and its control objectives is that active power that energy storage is exported and reactive power equal reference power.Now electrical network provides the support of microgrid voltage and frequency, when the power that energy storage inverter exports and reference power not etc. time, error signal is non-vanishing, thus pi regulator carries out DAZ gene adjustment, until error signal is zero, the power that namely energy storage inverter exports returns to reference power; Strategy 2 represents VF control modes, and its control objectives is that the amplitude of energy storage output voltage and frequency remain unchanged.Now energy-storage system is the main power source of micro-grid system, by the change of active power and reactive power reference qref is guaranteed the frequency of system and distributed power source meet ac bus place voltage magnitude equal its reference value respectively.
Fig. 2 is that energy-storage system of the present invention controls schematic diagram, and solid line is supply line, and dotted line is holding wire, and figure breaker in middle A point place is switching point detection, and switch B point place is the grid-connected switch of energy-storage system, switch C point place on-load switch.Mode controller control A switch completes control strategy, by signal feedback to PCS, carries out the pattern switching that VF and PQ controls.Energy-storage system is coordinated and managed by BMS, and BMS judges battery status, is managed by signal transmission to PCS.Measuring and controlling protective device gathers the data volume of switch A, the grid-connected switch B of energy-storage system, on-load switch C, and data are passed to EMS, during abnormal signal, and protection act.The feedback signal that EMS can gather monitoring and protection and PCS manages.When impedance detection device detects signal intensity once again, controlled by signal transmission and mode controller, A point switch closes, and energy-storage system control mode is transformed into VF by PQ and controls.Wherein, the effect of mode controller accepts and feedback control signal, and control switch, realizes control strategy; Monitoring and protection has measurement, gather and the function of transmission number, also can protection circuit, the protection act when circuit occurs abnormal; EMS (Energy Management System) is the modern power systems complex automatic system for supporting with computer technology and electric power system application software technology, also be the integration or integrated of energy system and information system, generally comprise Data Collection, energy management and network analysis three zones; The abbreviation of PCS, PCS and Process Control System, is meant to " Process Control System ", can realize Long-distance Control; BMS, battery management system (BMS) is the tie between battery and user, improves the utilance of battery, prevents battery from occurring overcharging and over-discharge can, extends the useful life of battery, the state of monitoring battery; PQ is island state, and VF is and net state.
The net capacity that general major network energy storage accesses is very large, and electrical network equiva lent impedance very little; On the other hand, energy storage system capacity is relatively very little, and equivalent impedance is relatively large.When general major network energy storage and energy-storage system are incorporated into the power networks, from switching point detection A, what system equivalent impedance was general major network energy storage with energy-storage system impedance is in parallel, and the numerical value of performance is less; When switching point detection A place disconnects, when energy-storage system is in island state, from switching point detection A, system equivalent impedance just equals the equivalent impedance of energy-storage system, and numerical value is larger.For ensureing the stability of a system, series load resistance R
2.Therefore, the resistance value at sense switch test point A place can find, energy storage be in and net state time A place equivalent impedance be major network in parallel with energy storage and load under impedance, its value is usual very little; When micro-capacitance sensor is in island state, the equivalent impedance at A place is usually comparatively large, is only the value in parallel of energy storage impedance and load.
Fig. 3 is impedance variation test point Cleaning Principle figure, and signal source selects a voltage source, sends high-frequency signal, and this signal equal proportion can amplify micro-capacitance sensor impedance and major network impedance.C
1be used for isolating power frequency component, impedance Z as coupling capacitance
1by C
1and R
1form, dotted line unit and contact resistance R
2with connect, L
2and C
2forming resonance frequency is the series resonant circuit of power frequency.By measuring U
3the situation of change of voltage carries out island state judgement.
A kind of energy storage control method based on impedance detection, introduce new energy storage control method, by formulating rational control strategy, can realize energy storage when major network fault is system power supply, and after major network recovers, energy storage realizes grid-connected, and the quick excision after energy storage fault, by the application of this energy storage control method, mains supply reliability can be improved, further expand stored energy application field, alleviate electrical network burden.Energy storage control method of the present invention uses the principle of impedance detection, make energy-storage system control carrying out more efficiently and effectively, effective guarantee load power supply reliability, can reduce power grid construction simultaneously, smooth power fluctuates, and plays positive role exist to guarantee power grid security.
Above an embodiment of the invention has been described in detail, but described content being only the preferred embodiment of the invention, the practical range for limiting the invention can not being considered to.All equalization changes done according to the invention application range with improve, within the patent covering scope that still all should belong to the invention.
Claims (2)
1. based on an energy storage control method for impedance detection, it is characterized in that: comprise following control flow:
Step 1: the impedance variation at testing circuit sense switch test point place, if nothing, then continues monitoring; If have, then forward step 2 to;
Step 2: pilot signal is passed to mode controller, this pilot signal is passed to PCS by mode controller, PCS reflected signal, carries out analysis of strategies, judges whether pilot signal meets tactful 1 trigger condition, does not meet, then terminates; Meet, then forward step 3 to;
Step 3: the triggering signal that switch disconnects is passed to mode controller, mode controller control switch disconnects, and feeds back PCS, and the control mode of energy-storage system is converted to PQ by VF;
Step 4: monitoring and protection is to switching point detection, on-load switch point, energy-storage system grid-connected switching point data volume signal feedback to EMS, and EMS judges whether data conform to strategy change, if conform to, then terminates; If do not conform to, then energy storage generation problem, protection act, energy storage switch motion;
Step 5: testing circuit detects switching point detection impedance variation once again, then forward step 6 to;
Step 6: pilot signal is passed to mode controller, this pilot signal is passed to PCS by mode controller, PCS reflected signal, carries out analysis of strategies, judges whether signal meets tactful 2 trigger conditions, does not meet, then terminates; Meet, then forward step 7 to;
Step 7: the triggering signal that switch disconnects is passed to mode controller, mode controller control switch test point switch closes, and feeds back PCS, and the control mode of energy-storage system is converted to VF by PQ, and electrical network normally runs.
2. a kind of energy storage control method based on impedance detection according to claim 1, it is characterized in that: described tactful 1 represents PQ control mode, its control objectives is that active power that energy storage is exported and reactive power equal reference power, now electrical network provides the support of microgrid voltage and frequency, when the power that energy storage inverter exports and reference power not etc. time, error signal is non-vanishing, thus pi regulator carries out DAZ gene adjustment, until error signal is zero, the power that namely energy storage inverter exports returns to reference power; Strategy 2 represents VF control mode, its control objectives is that the amplitude of energy storage output voltage and frequency remain unchanged, now energy-storage system is the main power source of micro-grid system, by the change of active power and reactive power reference qref is guaranteed the frequency of system and distributed power source meet ac bus place voltage magnitude equal its reference value respectively.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104808093A (en) * | 2015-05-13 | 2015-07-29 | 国家电网公司 | Anti-islanding protection testing circuit and method based on constant impedance load simulation |
| CN109474000A (en) * | 2017-12-29 | 2019-03-15 | 国网浙江省电力公司金华供电公司 | A kind of distribute-electricity transformer district distributed photovoltaic power intelligent analysis system and method |
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Cited By (3)
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| CN109474000A (en) * | 2017-12-29 | 2019-03-15 | 国网浙江省电力公司金华供电公司 | A kind of distribute-electricity transformer district distributed photovoltaic power intelligent analysis system and method |
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