CN103490450B - Energy storage parallel control method for middle-voltage and low-voltage micro-grid and device - Google Patents
Energy storage parallel control method for middle-voltage and low-voltage micro-grid and device Download PDFInfo
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- CN103490450B CN103490450B CN201310476994.XA CN201310476994A CN103490450B CN 103490450 B CN103490450 B CN 103490450B CN 201310476994 A CN201310476994 A CN 201310476994A CN 103490450 B CN103490450 B CN 103490450B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention provides an energy storage parallel control method for a middle-voltage and low-voltage micro-grid and a device for implementing the method. According to the method and the device, reasonable active power and reactive power are output according to changes of frequencies and voltage of a system, so as to realize the stable control of the frequencies and the voltage; an automatic interference reduction capability of a PI (Proportional plus Integral) controller is used so as to automatically realize the rapid and reasonable distribution of the active power and the reactive power of each energy storage unit under the fluctuation of the frequencies or the voltage. The method and the device provided by the invention have the advantages that independent control links of active-(frequencies and voltage) and reactive-(frequencies and voltage) are added in a control system of each energy storage unit so as to solve the problem that the frequencies and the voltage of the system, caused by line impendence, are controlled; the stability of the frequencies and the voltage when the micro-grid is operated in an off-grid manner is improved.
Description
technical field:
The present invention relates to a kind of energy storage control method for parallel for mesolow micro-capacitance sensor and implement the device of the method, belong to distributed power generation and micro-grid system field.
background technology:
When micro-capacitance sensor is from network operation, needing can the stable networking power supply of support system frequency and voltage.Diesel engine, middle-size and small-size gas turbine, energy storage etc. can be comprised as networking power supply.If adopt energy storage as networking power supply, its parallel running becomes the technical barrier needing to solve.
It is no matter the micro-capacitance sensor of middle pressure or low pressure, the feature of its line impedance determines and cannot to realize like that gaining merit the corresponding relation of-frequency, idle-voltage by image height voltage electric grid, the frequency and voltage of active power and system has coupled relation often, and the frequency and voltage of reactive power and system also has coupled relation.In addition, due to the line impedance of micro-capacitance sensor with the factor such as line length, ampacity in larger uncertainty, to actual storage energy operation to control to bring very large challenge.When the frequency of system changes, energy storage, from the angle of stabilized frequency, needs to export certain active power and reactive power to realize making up, but active power and reactive power number and proportionate relationship be difficult to determine.In like manner, when the voltage of system changes, energy storage needs the active power of output and reactive power and proportionate relationship thereof to be also difficult to determine.
summary of the invention:
In order to solve mesolow micro-capacitance sensor in the Parallel Control problem from energy storage during network operation, with the change according to system frequency and voltage, export rational active power and reactive power to realize the stability contorting of frequency and voltage, the object of this invention is to provide a kind of energy storage control method for parallel of mesolow micro-capacitance sensor, utilize PI controller to the automatic abatement ability of disturbance, realize the automatic active power of each energy-storage units under frequency or voltage fluctuation and the quick reasonable distribution of reactive power.
The present invention is achieved by the following technical solutions:
For an energy storage control method for parallel for mesolow micro-capacitance sensor, it is characterized in that, described control method comprises the following steps:
Step one) detect the frequency f at each energy-storage units grid integration point place, and with rated frequency f
refcompare and obtain frequency deviation f; Detect the voltage u at each energy-storage units grid integration point place, and with rated voltage u
refcompare and obtain voltage deviation Δ u.
Step 2) frequency deviation f obtains active power set-point P1 through PI1 adjuster, and this frequency deviation f obtains reactive power set-point Q1 through PI2 adjuster simultaneously; Voltage deviation Δ u obtains active power set-point P2 through PI3 adjuster, and this voltage deviation Δ u obtains reactive power set-point Q2 through PI4 adjuster simultaneously.
Step 3) active power set-point P1 and P2 is added, obtain active power set-point P; Reactive power set-point Q1 and Q2 is added, obtains reactive power set-point Q.
Step 4) the active current reference value i obtaining energy-storage units is resolved to active power set-point P and reactive power set-point Q
drefwith reactive current reference value i
qref.
Step 5) active current reference value i
drefcompare with active current actual value and obtain active current deviation and obtain voltage control quantity v through PI5 adjuster
d, reactive current reference value i
qrefcompare with reactive current actual value and obtain reactive current deviation and obtain voltage control quantity v through PI6 adjuster
q.
Step 6) voltage control quantity v
dwith v
qthrough Park inverse transformation, obtain the controlled quentity controlled variable u controlling energy accumulation current converter PWM
a, u
b, u
c.And then control active power and the reactive power that energy-storage units exports response.
Further scheme of the present invention is, the described energy storage control method for parallel for mesolow micro-capacitance sensor, is characterized in that, resolves active current reference value i by active power set-point P and reactive power set-point Q
drefwith reactive current reference value i
qrefexpression formula be:
, wherein e
d, e
qfor the ac-dc axis component of line voltage under rotating coordinate system.
Advantage of the present invention is: owing to adding meritorious-(frequency, voltage) in the control system of each energy-storage units, and the independent controlling unit of idle-(frequency, voltage), overcome because line impedance is uncertain to system frequency and voltage-controlled problem, improve micro-capacitance sensor from voltage during network operation and frequency stability.
accompanying drawing illustrates:
Fig. 1 is control method flow chart of the present invention (also as the circuit block diagram of control device of the present invention).
embodiment:
See Fig. 1, a kind of energy storage control method for parallel for mesolow micro-capacitance sensor of the present invention and controller, this control method comprises the following steps:
Step one: the frequency f detecting each energy-storage units grid integration point place, and by frequency comparator 1 and rated frequency f
refcompare and obtain frequency deviation f; Detect the voltage u at each energy-storage units grid integration point place, and by voltage comparator 2 and rated voltage u
refcompare and obtain voltage deviation Δ u.
Step 2: frequency deviation f obtains active power set-point P1 through the first proportional and integral controller PI1, and this frequency deviation f obtains reactive power set-point Q1 through the second proportional and integral controller PI2 simultaneously; Voltage deviation Δ u obtains active power set-point P2 through the 3rd proportional and integral controller PI3, and this voltage deviation Δ u obtains reactive power set-point Q2 through the 4th proportional and integral controller PI4 simultaneously.
Wherein, the first proportional and integral controller PI1 can be expressed as:
Wherein,
for proportionality coefficient,
for integral coefficient,
for integral operator.In the adjustment process of PI1, need comparative example coefficient
, integral coefficient
regulate, to obtain good dynamic process and steady-state process.Its basic principle is:
the larger integral action of parameter is stronger, eliminate ability stronger, but conference causes response speed slack-off excessively to static difference.In practical adjustments process, need according to practical object pair
,
carry out compromise definite value, to have dynamic property and steady-state behaviour concurrently.
Equally, other pi regulator PI2, PI3, PI4, PI5, PI6 in present embodiment, its expression way and adjustment process and PI1 similar.
Step 3: be added by first adder 3 by active power set-point P1 and P2, obtains active power set-point P; Reactive power set-point Q1 and Q2 is added by second adder 4, obtains reactive power set-point Q.
Step 4: active power set-point P and reactive power set-point Q is resolved by reference to value solver 5, obtains the active current reference value i of energy-storage units
drefwith reactive current reference value i
qref.
Step 5: active current reference value i
drefcompared by active current comparator 6 with active current actual value, obtain active current deviation, and obtain voltage control quantity v through the 5th proportional and integral controller PI5
d; Reactive current reference value i
qrefcompared by reactive current comparator 7 with reactive current actual value, obtain reactive current deviation, and obtain voltage control quantity v through the 6th proportional and integral controller PI6
q.
Step 6: voltage control quantity v
dwith v
qcarry out inverse transformation through Park inverse transformer 8, obtain the controlled quentity controlled variable u controlling energy accumulation current converter PWM
a, u
b, u
c.And then control active power and the reactive power that energy-storage units exports response.Wherein, Park inverse transformer 8 can be expressed as:
Wherein
for the angle between d-axis d axle and a axle.
Active current reference value i is resolved by described active power set-point P and reactive power set-point Q
drefwith reactive current reference value i
qrefexpression formula be:
(1)
Wherein e
d, e
qfor the ac-dc axis component of line voltage under rotating coordinate system, its expression formula is:
Wherein
for the angle between d-axis d axle and a axle.
Active current reference value i can be calculated according to formula (1)
drefwith reactive current reference value i
qref.
Claims (2)
1., for an energy storage control method for parallel for mesolow micro-capacitance sensor, it is characterized in that, comprise the following steps:
Step one) detect the frequency f at each energy-storage units grid integration point place, and with rated frequency f
refcompare and obtain frequency deviation f; Detect the voltage u at each energy-storage units grid integration point place, and with rated voltage u
refcompare and obtain voltage deviation Δ u;
Step 2) frequency deviation f obtains active power set-point P1 through PI1 adjuster, and this frequency deviation f obtains reactive power set-point Q1 through PI2 adjuster simultaneously; Voltage deviation Δ u obtains active power set-point P2 through PI3 adjuster, and this voltage deviation Δ u obtains reactive power set-point Q2 through PI4 adjuster simultaneously;
Step 3) active power set-point P1 and P2 is added, obtain active power set-point P; Reactive power set-point Q1 and Q2 is added, obtains reactive power set-point Q;
Step 4) the active current reference value i obtaining energy-storage units is resolved to active power set-point P and reactive power set-point Q
drefwith reactive current reference value i
qref;
Step 5) active current reference value i
drefcompare with active current actual value and obtain active current deviation and obtain voltage control quantity v through PI5 adjuster
d, reactive current reference value i
qrefcompare with reactive current actual value and obtain reactive current deviation and obtain voltage control quantity v through PI6 adjuster
q;
Step 6) voltage control quantity v
dwith v
qthrough Park inverse transformation, obtain the controlled quentity controlled variable u controlling energy accumulation current converter PWM
a, u
b, u
c, and then control active power and the reactive power that energy-storage units exports response;
Active current reference value i is resolved by active power set-point P and reactive power set-point Q
drefwith reactive current reference value i
qrefexpression formula be:
, wherein e
d, e
qfor the ac-dc axis component of line voltage under rotating coordinate system.
2. implement the claims a controller for the energy storage control method for parallel for mesolow micro-capacitance sensor described in 1, it is characterized in that,
comprise:
Frequency comparator 1, for detecting frequency f and the rated frequency f at each energy-storage units grid integration point place
refcompare, obtain frequency deviation f; And voltage comparator 2, for will voltage u and the rated voltage u at each energy-storage units grid integration point place be detected
refcompare, obtain voltage deviation Δ u; And:
First proportional and integral controller PI1: obtain active power set-point P1 for frequency deviation f being carried out adjustment; And:
Second proportional and integral controller PI2: this frequency deviation f is carried out adjustment simultaneously and obtain reactive power set-point Q1; And
3rd proportional and integral controller PI3: voltage deviation Δ u is carried out adjustment and obtains active power set-point P2, and:
4th proportional and integral controller PI4: this voltage deviation Δ u is carried out adjustment simultaneously and obtain reactive power set-point Q2; And:
First adder 3: active power set-point P1 and P2 is added, obtains active power set-point P; And:
Second adder 4: by reactive power set-point Q1 and Q2 by being added, obtain reactive power set-point Q; And:
Reference value solver 5: active power set-point P and reactive power set-point Q is resolved, obtains the active current reference value i of energy-storage units
drefwith reactive current reference value i
qref; And:
Active current comparator 6 and the 5th proportional and integral controller PI5: active current comparator 6 is for by active current reference value i
drefwith active current actual value i
dby comparing, obtain active current deviation; And obtain voltage control quantity v through the 5th proportional and integral controller PI5
d; And:
Reactive current comparator 7 and the 6th proportional and integral controller PI6: reactive current comparator 7 is for by reactive current reference value i
qrefcompare with reactive current actual value, obtain reactive current deviation, and obtain voltage control quantity v through the 6th proportional and integral controller PI6
q; And:
Park inverse transformer 8: for by voltage control quantity v
dwith v
qcarry out inverse transformation, obtain the controlled quentity controlled variable u controlling energy accumulation current converter PWM
a, u
b, u
c, and then control active power and the reactive power that energy-storage units exports response.
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| WO2016109330A1 (en) | 2014-12-30 | 2016-07-07 | Flexgen Power Systems, Inc. | Transient power stabilization device with active and reactive power control |
| CN107221944B (en) * | 2017-08-01 | 2023-07-21 | 北京艾科迈新能源科技有限公司 | Light stores up and fills and integrative system |
| CN109494806B (en) * | 2018-12-28 | 2022-03-18 | 四川科陆新能电气有限公司 | Diesel power generation system impedance detection method with parallel current sharing of energy storage converter |
| CN110854899B (en) * | 2019-12-09 | 2024-01-30 | 国网山东省电力公司电力科学研究院 | Energy storage-camera power support system for HVDC and power distribution method thereof |
| CN112467799B (en) * | 2021-01-25 | 2021-05-14 | 国网江西省电力有限公司电力科学研究院 | Grid-connected control method and device for battery energy storage system |
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