CN112491097A - Direct-current energy storage power-voltage regulation method - Google Patents

Direct-current energy storage power-voltage regulation method Download PDF

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CN112491097A
CN112491097A CN202011312557.0A CN202011312557A CN112491097A CN 112491097 A CN112491097 A CN 112491097A CN 202011312557 A CN202011312557 A CN 202011312557A CN 112491097 A CN112491097 A CN 112491097A
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voltage
power
droop
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CN112491097B (en
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杨沛豪
孙钢虎
兀鹏越
柴琦
王小辉
寇水潮
高峰
姜宁
郭新宇
孙梦瑶
李志鹏
赵俊博
薛磊
贺婷
张立松
郭霞
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Xian Thermal Power Research Institute Co Ltd
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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
    • 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
    • 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

本发明公开了一种直流储能功率‑电压调节方法，包括：在直流储能换流器中采用直流储能有功‑电压控制，得到输出误差信号e表达式；根据储能换流器工作于逆变状态、储能换流器工作于整流状态及直流储能换流器输出有功功率方程，建立直流储能有功‑电压下垂控制方程；当调节电压为正，建立自适应下垂系数Dm1；当调节电压为负，建立自适应下垂系数Dm2；共同组成自适应下垂系数Dm；将自适应下垂系数Dm引入直流储能有功‑电压下垂控制方程中，得到自适应下垂控制数学表达式。本发明采用自适应有功‑电压下垂控制，可以减少储能电压调节范围。

Figure 202011312557

The invention discloses a method for regulating DC energy storage power-voltage, comprising: adopting DC energy storage active power-voltage control in a DC energy storage converter to obtain an output error signal e expression; In the inverter state, the energy storage converter works in the rectification state and the output active power equation of the DC energy storage converter, the DC energy storage active-voltage droop control equation is established; when the regulation voltage is positive, the adaptive droop coefficient D m1 is established; When the regulation voltage is negative, the adaptive droop coefficient D m2 is established; the adaptive droop coefficient D m is formed together; the adaptive droop coefficient D m is introduced into the DC energy storage active-voltage droop control equation, and the adaptive droop control mathematical expression is obtained . The invention adopts adaptive active-voltage droop control, which can reduce the energy storage voltage adjustment range.

Figure 202011312557

Description

Direct-current energy storage power-voltage regulation method
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:
Figure BDA0002790265130000021
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:
Figure BDA0002790265130000031
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：
Figure BDA0002790265130000032
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：
Figure BDA0002790265130000033
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：
Figure BDA0002790265130000034
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:
Figure BDA0002790265130000035
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:
Figure BDA0002790265130000041
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:
Figure BDA0002790265130000042
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:
Figure BDA0002790265130000051
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:
Figure BDA0002790265130000052
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)

1.一种直流储能功率-电压调节方法，其特征在于，包括以下步骤：1. a direct current energy storage power-voltage regulation method, is characterized in that, comprises the following steps: 1)在直流储能换流器中采用直流储能有功-电压控制，得到输出误差信号e表达式；1) Adopt DC energy storage active-voltage control in the DC energy storage converter to obtain the output error signal e expression; 2)定义步骤1)直流储能换流器输出有功功率方程中功率调节为负，功率由直流侧向交流侧传输，储能换流器工作于逆变状态；2) Definition step 1) In the output active power equation of the DC energy storage converter, the power regulation is negative, the power is transmitted from the DC side to the AC side, and the energy storage converter works in the inverter state; 3)定义步骤1)直流储能换流器输出有功功率方程中功率调节为正，功率由交流侧向直流侧传输，储能换流器工作于整流状态；3) Definition step 1) In the output active power equation of the DC energy storage converter, the power regulation is positive, the power is transmitted from the AC side to the DC side, and the energy storage converter works in the rectification state; 4)根据步骤2)储能换流器工作于逆变状态、步骤3)储能换流器工作于整流状态及步骤1)直流储能换流器输出有功功率方程，建立直流储能有功-电压下垂控制方程；4) According to step 2) the energy storage converter works in the inverter state, step 3) the energy storage converter works in the rectification state and step 1) the output active power equation of the DC energy storage converter, establish the DC energy storage active power- Voltage droop control equation; 5)对步骤4)得到的直流储能有功-电压下垂控制方程中下垂系数进行改进，当调节电压为正，建立自适应下垂系数Dm1；5) improving the droop coefficient in the DC energy storage active power-voltage droop control equation obtained in step 4), and establishing an adaptive droop coefficient D m1 when the regulation voltage is positive; 6)对步骤4)得到的直流储能有功-电压下垂控制方程中下垂系数进行改进，当调节电压为负，建立自适应下垂系数Dm2；6) improving the droop coefficient in the DC energy storage active power-voltage droop control equation obtained in step 4), and establishing an adaptive droop coefficient D m2 when the regulation voltage is negative; 7)将步骤5)得到的自适应下垂系数Dm1，步骤6)得到的自适应下垂系数Dm2共同组成自适应下垂系数Dm；7) Combining the adaptive droop coefficient D m1 obtained in step 5) and the adaptive droop coefficient D m2 obtained in step 6) into an adaptive droop coefficient D m ; 8)将步骤7)得到的自适应下垂系数Dm引入步骤4)直流储能有功-电压下垂控制方程中，得到自适应下垂控制数学表达式。8) The adaptive droop coefficient D m obtained in step 7) is introduced into the active power-voltage droop control equation of step 4) DC energy storage, and the mathematical expression of adaptive droop control is obtained. 2.根据权利要求1所述的一种直流储能功率-电压调节方法，其特征在于，步骤1)的具体实现方法为：在直流储能换流器中采用直流储能有功-电压控制，得到输出误差信号e表达式：
Figure FDA0002790265120000011
其中：Udc和U* dc是直流储能换流器直流侧电压实际值和参考值；P和P*是直流储能换流器的交流侧有功功率实际值和参考值；D是直流储能换流器的下垂系数；e是下垂控制输出误差信号；有功功率与直流电源输出电压成正比关系，可以通过直流电源输出电压Udc静差调节来参与到直流储能有功功率输出调节控制中。2. a kind of direct current energy storage power-voltage regulation method according to claim 1, is characterized in that, the concrete realization method of step 1) is: adopt direct current energy storage active power-voltage control in direct current energy storage converter, Get the output error signal e expression:
Figure FDA0002790265120000011
Among them: U dc and U * dc are the actual value and reference value of the DC side voltage of the DC energy storage converter; P and P * are the actual value and reference value of the AC side active power of the DC energy storage converter; D is the DC energy storage converter. The droop coefficient of the energy converter; e is the droop control output error signal; the active power is proportional to the output voltage of the DC power supply, and can participate in the DC energy storage active power output adjustment control through the DC power supply output voltage U dc static difference adjustment . 3.根据权利要求2所述的一种直流储能功率-电压调节方法，其特征在于，步骤2)的具体实现方法为：定义步骤1)直流储能换流器输出有功功率方程中功率调节P*-P为负，功率由直流侧向交流侧传输，储能换流器工作于逆变状态。3. A kind of direct current energy storage power-voltage regulation method according to claim 2, it is characterized in that, the concrete realization method of step 2) is: define step 1) power regulation in the output active power equation of direct current energy storage converter P * -P is negative, the power is transmitted from the DC side to the AC side, and the energy storage converter works in the inverter state. 4.根据权利要求3所述的一种直流储能功率-电压调节方法，其特征在于，步骤3)的具体实现方法为：定义步骤1)直流储能换流器输出有功功率方程中功率调节P*-P为正，功率由交流侧向直流侧传输，储能换流器工作于整流状态。4. a kind of direct current energy storage power-voltage regulation method according to claim 3, is characterized in that, the concrete realization method of step 3) is: define step 1) power regulation in the output active power equation of direct current energy storage converter P * -P is positive, the power is transmitted from the AC side to the DC side, and the energy storage converter works in the rectification state. 5.根据权利要求4所述的一种直流储能功率-电压调节方法，其特征在于，步骤4)的具体实现方法为：根据步骤2)储能换流器工作于逆变状态、步骤3)储能换流器工作于整流状态及步骤1)输出误差信号e表达式，下垂控制输出输出误差信号e＝0，建立直流储能有功-电压下垂控制方程：
Figure FDA0002790265120000021
5 . The method for regulating DC energy storage power-voltage according to claim 4 , wherein the specific implementation method of step 4) is: according to step 2) the energy storage converter works in an inverter state, step 3 ) The energy storage converter works in the rectification state and step 1) outputs the expression of the error signal e, the droop control outputs the output error signal e=0, and establishes the DC energy storage active power-voltage droop control equation:
Figure FDA0002790265120000021
 6.根据权利要求5所述的一种直流储能功率-电压调节方法，其特征在于，步骤5)的具体实现方法为：对步骤4)得到的直流储能有功-电压下垂控制方程中下垂系数进行改进，当调节电压为正，建立自适应下垂系数Dm1：
Figure FDA0002790265120000022
式中：ΔP为实时功率与目标功率差值；ΔUdc为直流电压参考值与实际值差值。6. A kind of direct current energy storage power-voltage regulation method according to claim 5, is characterized in that, the concrete realization method of step 5) is: to the direct current energy storage active power-voltage droop control equation obtained in step 4) droop The coefficient is improved, and when the regulation voltage is positive, the adaptive droop coefficient D m1 is established:
Figure FDA0002790265120000022
In the formula: ΔP is the difference between the real-time power and the target power; ΔU dc is the difference between the DC voltage reference value and the actual value. 7.根据权利要求6所述的一种直流储能功率-电压调节方法，其特征在于，步骤6)的具体实现方法为：对步骤4)得到的直流储能有功-电压下垂控制方程中下垂系数进行改进，当调节电压为负，建立自适应下垂系数Dm2：
Figure FDA0002790265120000023
7. A kind of direct current energy storage power-voltage regulation method according to claim 6, is characterized in that, the concrete realization method of step 6) is: droop in the direct current energy storage active power-voltage droop control equation obtained in step 4) The coefficient is improved, when the regulation voltage is negative, the adaptive droop coefficient D m2 is established:
Figure FDA0002790265120000023
 8.根据权利要求7所述的一种直流储能功率-电压调节方法，其特征在于，步骤7)的具体实现方法为：将将步骤5)得到的自适应下垂系数Dm1，步骤6)得到的自适应下垂系数Dm2共同组成自适应下垂系数Dm：
Figure FDA0002790265120000024
当ΔUdc＞0，即调节电压为正时，分子系数选择Umax-Udc；当ΔUdc＜0，即调节电压为负时，选择Umin-Udc。8. A DC energy storage power-voltage adjustment method according to claim 7, wherein the specific implementation method of step 7) is: using the adaptive droop coefficient D m1 obtained in step 5), step 6) The obtained adaptive droop coefficients D m2 together form the adaptive droop coefficients D m :
Figure FDA0002790265120000024
When ΔU dc >0, that is, when the adjustment voltage is positive, the numerator coefficient is selected as U max -U dc ; when ΔU dc <0, that is, when the adjustment voltage is negative, U min -U dc is selected. 9.根据权利要求8所述的一种直流储能功率-电压调节方法，其特征在于，步骤8)的具体实现方法为：
Figure FDA0002790265120000031
9. A kind of direct current energy storage power-voltage regulation method according to claim 8, is characterized in that, the concrete realization method of step 8) is:
Figure FDA0002790265120000031
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CN115224718A (en) * 2022-09-20 2022-10-21 西安热工研究院有限公司 Adaptive droop control method and system for energy storage converter
CN115241898A (en) * 2022-09-20 2022-10-25 西安热工研究院有限公司 Droop control method and system for energy storage voltage converter
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WO2023241393A1 (en) * 2022-06-14 2023-12-21 万帮数字能源股份有限公司 Control method and apparatus for parallel energy storage units in direct-current microgrid
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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
CN116054266B (en) * 2023-03-31 2023-07-18 西安热工研究院有限公司 A system and method for frequency regulation and peak regulation of controllable energy storage power station combined with thermal power unit

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