CN112491097A - 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 power-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 establishedm1(ii) a When the regulated voltage is negative, an adaptive droop coefficient D is establishedm2(ii) a Common component adaptive droop coefficient Dm(ii) a Will adapt the droop coefficient DmAnd 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 energy storage electricityThe pressure regulation range.
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 energy absorption and release in a power grid, and has the advantages of replacement or not in maintaining the voltage stability of the power grid due to quick response and flexible control.
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), the power in an output active power equation of the direct current energy storage converter is adjusted to be negative, the 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 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 positivem1；
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 negativem2；
7) The self-adaptive droop coefficient D obtained in the step 5)m1And 6) obtaining the self-adaptive droop coefficient Dm2Co-composition adaptive droop systemNumber Dm；
8) Using the adaptive droop coefficient D obtained in the step 7)mAnd (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) is as follows: in the DC energy storage converter, DC energy storage active-voltage control is adopted to obtain an output error signal e expression:
wherein: u shapedcAnd U* dcThe 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 outputdcAnd 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 direct current energy storage converter output active power equation 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 direct current energy storage converter output active power equation 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) is as follows: 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, droop control output error signal e is 0, and a direct-current energy storage active-voltage droop control equation is established:
the further improvement of the invention is that the concrete implementation method of the step 5) 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 positivem1：
In the formula: delta P is the difference between the real-time power and the target power; delta UdcIs the difference between the DC voltage reference value and the actual value.
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 negativem2：
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) ism1And 6) obtaining the self-adaptive droop coefficient Dm2Common component adaptive droop coefficient Dm：
When Δ UdcIf the voltage is adjusted to be positive, the molecular coefficient is selected to be Umax-Udc(ii) a When Δ UdcIf < 0, i.e. the regulated voltage is negative, U is selectedmin-Udc。
The further improvement of the invention is that the specific implementation method of the step 8) is as follows:
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 architecture;
fig. 2 is a dc energy storage active-voltage droop control curve;
fig. 3 is a comparison graph of the dc energy storage active-voltage adaptive droop control curve.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying 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 shapedcAnd U* dcThe 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.
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 obtaineddcAnd the static difference adjustment participates in the adjustment control of the direct-current energy storage active power output.
As shown in FIG. 2, UdcmaxAnd UdcminRespectively setting the upper limit and the lower limit of the direct-current voltage threshold of the energy storage converter; pmaxAnd P-maxRespectively 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, when the power is adjusted to be positive, the power is transmitted from the alternating current side to the direct current side,the energy storage converter operates in a rectifying state. The droop control of the direct current active voltage essentially realizes the static difference adjustment of the direct current voltage through the active power adjustment, under the steady state condition, the droop control output error signal e is 0, and then the 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 a self-adaptive droop control scheme, which automatically adjusts a droop coefficient according to a voltage deviation, wherein the self-adaptive droop coefficient can be expressed as:
in formula (3): dmIs an adaptive droop coefficient; delta P is the difference between the real-time power and the target power; delta UdcIs the difference between the DC voltage reference value and the actual value. When Δ UdcIf the voltage is adjusted to be positive, the molecular coefficient is selected to be Umax-Udc(ii) a When Δ UdcIf < 0, i.e. the regulated voltage is negative, U is selectedmin-Udc。
The energy storage converter works in an inversion state when the power regulating quantity is delta P1The voltage regulating quantities of the traditional droop control and the self-adaptive droop control are respectively delta U1dc、ΔU1mdcAnd is Δ U1dc＞ΔU1mdc(ii) a The energy storage converter works in a rectification state when the power regulation quantity is delta P2The voltage regulating quantities of the traditional droop control and the self-adaptive droop control are respectively delta U2dc、ΔU2mdcAnd is Δ U2dc＞ΔU2mdc. 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. In the same way, the DC voltage regulating circuit is adopted when the same DC voltage regulating quantity is metThe power regulation range of the proposed adaptive droop control 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 (9)
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 output error signal e expression;
2) defining that in the step 1), the power in an output active power equation of the direct current energy storage converter is adjusted to be negative, the 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 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 positivem1；
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 when the regulated voltage is negativeDm2；
7) The self-adaptive droop coefficient D obtained in the step 5)m1And 6) obtaining the self-adaptive droop coefficient Dm2Common component adaptive droop coefficient Dm；
8) Using the adaptive droop coefficient D obtained in the step 7)mAnd (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 1) is realized by the following steps: in the DC energy storage converter, DC energy storage active-voltage control is adopted to obtain an output error signal e expression:
wherein: u shapedcAnd U* dcThe 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 outputdcAnd the static difference adjustment participates in the adjustment control of the direct-current energy storage active power output.
3. The method for regulating the DC energy storage power-voltage according to claim 2, wherein the step 2) is realized by the following steps: defining power regulation P in direct current energy storage converter output active power equation 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.
4. The method for regulating the DC energy storage power-voltage according to claim 3, wherein the step 3) is realized by the following steps: defining power regulation P in direct current energy storage converter output active power equation in step 1)*P is positive, power isThe alternating current is transmitted to the direct current side, and the energy storage converter works in a rectification state.
5. The method for regulating the DC energy storage power-voltage according to claim 4, wherein the step 4) is realized by 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, droop control output error signal e is 0, and a direct-current energy storage active-voltage droop control equation is established:
6. the method for regulating the DC energy storage power-voltage according to claim 5, wherein the step 5) is realized by 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 positivem1：
In the formula: delta P is the difference between the real-time power and the target power; delta UdcIs the difference between the DC voltage reference value and the actual value.
7. The method for regulating the DC energy storage power-voltage according to claim 6, wherein the step 6) is realized by 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 negativem2：
8. The method for regulating the DC energy storage power-voltage according to claim 7, wherein the step 7) is realized by the following steps: will be obtained by the step 5)To adaptive droop coefficient Dm1And 6) obtaining the self-adaptive droop coefficient Dm2Common component adaptive droop coefficient Dm：
When Δ UdcIf the voltage is adjusted to be positive, the molecular coefficient is selected to be Umax-Udc(ii) a When Δ UdcIf < 0, i.e. the regulated voltage is negative, U is selectedmin-Udc。
9. The method for regulating the DC energy storage power-voltage according to claim 8, wherein the step 8) is realized by the following steps:
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| CN115241898A (en) * | 2022-09-20 | 2022-10-25 | 西安热工研究院有限公司 | Droop control method and system of energy storage voltage type current converter |
| CN116054266A (en) * | 2023-03-31 | 2023-05-02 | 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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| CN116054266A (en) * | 2023-03-31 | 2023-05-02 | 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 |