CN112491097B - Direct-current energy storage power-voltage regulation method - Google Patents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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Abstract
The invention discloses a direct-current energy storage power-voltage regulation method, which comprises the following steps: adopting direct-current energy storage active-voltage control in a direct-current energy storage converter to obtain an output error signal e expression; establishing a direct-current energy storage active-voltage droop control equation according to the energy storage converter working in an inversion state, the energy storage converter working in a rectification state and the direct-current energy storage converter output active power equation; when the regulated voltage is positive, an adaptive droop coefficient D is established m1 (ii) a When the regulated voltage is negative, establishing an adaptive droop coefficient D m2 (ii) a Common component adaptive droop coefficient D m (ii) a Adaptive droop coefficient D m And introducing a direct-current energy storage active-voltage droop control equation to obtain a self-adaptive droop control mathematical expression. The invention adopts self-adaptive active power-voltage droop control, and can reduce the regulation range of the energy storage voltage.
Description
Technical Field
The invention relates to a direct-current energy storage power-voltage regulation method which adopts self-adaptive droop control to reduce the energy storage voltage regulation range.
Background
The capacity of a power grid is continuously increased, the structure of a regional power grid becomes complex, and a micro-grid formed by high-permeability distributed power supply points such as photovoltaic power, wind power and the like has the influence on the frequency stability of the large power grid due to the characteristics of low inertia and low damping. The energy storage unit is used as a power supply capable of being charged and discharged flexibly, can realize dynamic absorption and energy release in a power grid, and has the advantages of quick response, flexible control and capability of replacing the power grid voltage stability.
At present, in the field of direct-current energy storage voltage regulation, a linear droop control scheme is mostly adopted, active-voltage droop control is utilized, voltage regulation is realized by controlling active power, and the flexibility is not provided.
Disclosure of Invention
The invention aims to provide a direct-current energy storage power-voltage regulation method which adopts self-adaptive active-voltage droop control and reduces the energy storage voltage regulation range.
The invention is realized by adopting the following technical scheme:
a DC energy storage power-voltage regulation method comprises the following steps:
1) Adopting direct-current energy storage active-voltage control in a direct-current energy storage converter to obtain an output error signal e expression;
2) Defining that in the step 1), power in an output active power equation of the direct current energy storage converter is regulated to be negative, power is transmitted from a direct current side to an alternating current side, and the energy storage converter works in an inversion state;
3) Defining the power regulation in an output active power equation of the direct current energy storage converter in the step 1) to be positive, wherein the power is transmitted from an alternating current side to a direct current side, and the energy storage converter works in a rectification state;
4) Establishing a direct-current energy storage active power-voltage droop control equation according to the fact that the energy storage converter works in an inversion state in the step 2), the energy storage converter works in a rectification state in the step 3) and the direct-current energy storage converter outputs an active power equation in the step 1);
5) Improving the droop coefficient in the direct-current energy storage active power-voltage droop control equation obtained in the step 4), and establishing an adaptive droop coefficient D when the regulated voltage is positive m1 ；
6) Improving the droop coefficient in the direct-current energy storage active power-voltage droop control equation obtained in the step 4), and establishing an adaptive droop coefficient D when the regulated voltage is negative m2 ；
7) The self-adaptive droop coefficient D obtained in the step 5) m1 And 6) obtaining the self-adaptive droop coefficient D m2 Common component adaptive droop coefficient D m ；
8) Using the adaptive droop coefficient D obtained in the step 7) m And (4) introducing the direct-current energy storage active power-voltage droop control equation in the step 4) to obtain a self-adaptive droop control mathematical expression.
The further improvement of the invention is that the specific implementation method of the step 1) comprises the following steps: adopting direct-current energy storage active-voltage control in a direct-current energy storage converter to obtain an expression of an output error signal e:
wherein: u shape dc And U * dc The voltage of the direct current side of the direct current energy storage converter is an actual value and a reference value; p and P * Actual value and reference value of active power at the alternating current side of the direct current energy storage converter; d is the droop coefficient of the direct current energy storage converter; e is the droop control output error signal; the active power is in direct proportion to the output voltage of the direct current power supply, and the output voltage U of the direct current power supply can be output dc And the static difference adjustment participates in the adjustment control of the direct-current energy storage active power output.
The further improvement of the invention is that the specific implementation method of the step 2) is as follows: defining power regulation P in output active power equation of direct current energy storage converter in step 1) * P is negative, power is transmitted from the direct current side to the alternating current side, and the energy storage converter works in an inversion state.
The further improvement of the invention is that the specific implementation method of the step 3) is as follows: defining power regulation P in output active power equation of direct current energy storage converter in step 1) * P is positive, power is transmitted from the alternating current side to the direct current side, and the energy storage converter works in a rectification state.
The further improvement of the invention is that the specific implementation method of the step 4) comprises the following steps: according to the steps that 2) the energy storage converter works in an inversion state, 3) the energy storage converter works in a rectification state, 1) an error signal e expression is output, a droop control output error signal e =0, and a direct-current energy storage active-voltage droop control equation is established:
the further improvement of the invention is that the specific implementation method of the step 5) comprises the following steps: improving the droop coefficient in the direct-current energy storage active power-voltage droop control equation obtained in the step 4), and establishing an adaptive droop coefficient D when the regulated voltage is positive m1 ：
In the formula: delta P is the difference between the real-time power and the target power; delta ofU dc The difference value between the DC voltage reference value and the actual value is obtained.
The further improvement of the invention is that the specific implementation method of the step 6) is as follows: improving the droop coefficient in the direct-current energy storage active power-voltage droop control equation obtained in the step 4), and establishing an adaptive droop coefficient D when the regulated voltage is negative m2 ：
The further improvement of the invention is that the specific implementation method of the step 7) is as follows: the adaptive droop coefficient D obtained in the step 5) is m1 And 6) obtaining the self-adaptive droop coefficient D m2 Common component adaptive droop coefficient D m ：
When Δ U dc If the voltage is adjusted to be positive, the molecular coefficient is selected to be U max -U dc (ii) a When Δ U is measured dc If < 0, i.e. the regulation voltage is negative, U is selected min -U dc 。
The further improvement of the invention is that the specific implementation method of the step 8) comprises the following steps:
compared with the prior art, the invention has at least the following beneficial technical effects:
1. the invention provides a self-adaptive active power-voltage droop control scheme which can realize accurate voltage regulation.
2. The direct current energy storage voltage adjusting method provided by the invention can effectively reduce the adjusting range of the energy storage voltage.
Drawings
Fig. 1 is a block diagram of a dc energy storage droop control structure;
fig. 2 is a dc energy storage active-voltage droop control curve;
fig. 3 is a comparison diagram of the dc energy storage active-voltage adaptive droop control curve.
Detailed Description
The technical scheme of the invention is further described in detail through the attached drawings.
As shown in fig. 1, the dc energy storage is different from the ac energy storage, only the active power is output, the reactive power, the frequency, the phase angle and other electrical quantities do not need to be considered, the dc energy storage active-voltage control is adopted in the dc energy storage converter, and the output error signal e can be expressed as:
in formula (1): u shape dc And U * dc The voltage of the direct current side of the direct current energy storage converter is an actual value and a reference value; p and P * The actual value and the reference value of the active power of the alternating current side of the direct current energy storage converter are obtained; d is the droop coefficient of the direct current energy storage converter; e is the droop control output error signal.
As can be seen from the formula (1), the active power is in direct proportion to the output voltage of the DC power supply, and the output voltage U of the DC power supply can be output dc And the static difference regulation participates in the regulation control of the output of the direct-current energy storage active power.
As shown in FIG. 2, U dcmax And U dcmin Respectively setting the upper limit and the lower limit of the direct-current voltage threshold of the energy storage converter; p is max And P -max Respectively the maximum value of the active power of the energy storage converter; the shaded portion represents the droop control active area. When the power is adjusted to be negative, the power is transmitted from the direct current side to the alternating current side, the energy storage converter works in an inversion state, and when the power is adjusted to be positive, the power is transmitted from the alternating current side to the direct current side, and the energy storage converter works in a rectification state. The essential of the direct current active voltage droop control is that the direct current voltage static difference adjustment is realized through active power adjustment, under the steady state condition, the droop control outputs an error signal e =0, and then formula (1) can be converted into:
as shown in fig. 3, a droop coefficient D in the conventional dc energy storage active voltage droop control is a fixed value, and the voltage control effect and the power distribution characteristic cannot be considered at the same time, so that the defects of large dc voltage deviation, poor power distribution characteristic and the like exist. The invention provides an adaptive droop control scheme, which automatically adjusts a droop coefficient according to a voltage deviation, wherein the adaptive droop coefficient can be expressed as follows:
in formula (3): d m Is an adaptive droop coefficient; delta P is the difference between the real-time power and the target power; delta U dc Is the difference between the DC voltage reference value and the actual value. When Δ U is measured dc If the voltage is adjusted to be positive, the molecular coefficient is selected to be U max -U dc (ii) a When Δ U dc If < 0, i.e. the regulated voltage is negative, U is selected min -U dc 。
The energy storage converter works in an inversion state when the power regulating quantity is delta P 1 The voltage regulating quantities of the traditional droop control and the self-adaptive droop control are respectively delta U 1dc 、ΔU 1mdc And is Δ U 1dc ＞ΔU 1mdc (ii) a The energy storage converter works in a rectification state when the power regulation quantity is delta P 2 The voltage regulating quantities of the traditional droop control and the self-adaptive droop control are respectively delta U 2dc 、ΔU 2mdc And Δ U 2dc ＞ΔU 2mdc . When the same active fluctuation is faced, the self-adaptive droop control voltage adjusting range provided by the invention is smaller, and the system influence is less. Similarly, when the same direct-current voltage regulating quantity is met, the self-adaptive droop control power regulating range provided by the invention is smaller.
The self-adaptive droop coefficient provided by the invention is applied to direct-current energy storage active-voltage droop control, and the mathematical expression of the self-adaptive droop control is as follows:
the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (3)
1. A direct-current energy storage power-voltage regulation method is characterized by comprising the following steps:
1) Adopting direct-current energy storage active-voltage control in a direct-current energy storage converter to obtain an expression of an output error signal e:
wherein: u shape dc And U * dc The voltage of the direct current side of the direct current energy storage converter is an actual value and a reference value; p and P * The actual value and the reference value of the active power of the alternating current side of the direct current energy storage converter are obtained; d is the droop coefficient of the direct current energy storage converter; e is the droop control output error signal; the active power is in direct proportion to the output voltage of the direct current power supply, and the output voltage U of the direct current power supply can be output dc The static difference adjustment is used for participating in the adjustment control of the direct-current energy storage active power output;
2) Defining power regulation P in output active power equation of direct current energy storage converter in step 1) * P is negative, power is transmitted from the direct current side to the alternating current side, and the energy storage converter works in an inversion state;
3) Defining power regulation P in direct current energy storage converter output active power equation in step 1) * -P is positive, power is transmitted from the ac side to the dc side, and the energy storage converter operates in a rectified state;
4) According to the steps that 2) the energy storage converter works in an inversion state, 3) the energy storage converter works in a rectification state, and 1) an error signal e expression is output, a droop control output error signal e =0, and a direct-current energy storage active-voltage droop control equation is established:
5) Improving the droop coefficient in the direct-current energy storage active power-voltage droop control equation obtained in the step 4), and establishing an adaptive droop coefficient D when the regulated voltage is positive m1 ：
In the formula: delta P is the difference between the real-time power and the target power; delta U dc The difference value of the direct current voltage reference value and the actual value is obtained;
6) Improving the droop coefficient in the direct-current energy storage active power-voltage droop control equation obtained in the step 4), and establishing an adaptive droop coefficient D when the regulated voltage is negative m2 ：
7) The self-adaptive droop coefficient D obtained in the step 5) m1 And 6) obtaining the self-adaptive droop coefficient D m2 Common component adaptive droop coefficient D m ；
8) Using the adaptive droop coefficient D obtained in the step 7) m And (4) introducing the direct-current energy storage active power-voltage droop control equation in the step 4) to obtain a self-adaptive droop control mathematical expression.
2. The method for regulating the DC energy storage power-voltage according to claim 1, wherein the step 7) is realized by the following steps: the self-adaptive droop coefficient D obtained in the step 5) m1 And 6) obtaining the self-adaptive droop coefficient D m2 Common component adaptive droop coefficient D m ：
When Δ U is measured dc Greater than 0, i.e. the regulation voltage is positive, the index coefficient is selected to be U dcmax -U dc (ii) a When Δ U dc If < 0, i.e. the regulated voltage is negative, U is selected dcmin -U dc 。
3. The method of claim 2, wherein the DC storage power-voltage regulation method is characterized in thatThe specific implementation method of the step 8) comprises the following steps:
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| CN114928041A (en) * | 2022-06-14 | 2022-08-19 | 万帮数字能源股份有限公司 | Control method and device for parallel energy storage units in direct-current micro-grid |
| CN114825482A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Super capacitor voltage stabilizing system and method for thermal power frequency modulation |
| CN115224718B (en) * | 2022-09-20 | 2023-02-03 | 西安热工研究院有限公司 | Self-adaptive droop control method and system for energy storage converter |
| CN115241898B (en) * | 2022-09-20 | 2023-02-03 | 西安热工研究院有限公司 | Droop control method and system of energy storage voltage type current converter |
| CN116054266B (en) * | 2023-03-31 | 2023-07-18 | 西安热工研究院有限公司 | Frequency modulation and peak shaving system and method for controllable energy storage power station combined thermal power unit |
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Application publication date: 20210312 Assignee: HUANENG LUOYUAN POWER GENERATION Co.,Ltd. Assignor: Xi'an Thermal Power Research Institute Co.,Ltd. Contract record no.: X2023110000149 Denomination of invention: A DC Energy Storage Power Voltage Adjustment Method Granted publication date: 20230407 License type: Common License Record date: 20231206 |