CN106602597A - Grid-connected micro power grid energy storage control method based on smooth control - Google Patents

Abstract

The invention discloses a grid-connected micro power grid energy storage control method based on smooth control. The method comprises steps that 1), the actual charge state information of a super capacitor in a grid-connected micro power grid and the power information outputted by a photovoltaic array, an aerogenerator and a super capacitor direction grid-connected micro power grid are detected; 2), a power fluctuation component PESS for stabilization required by hybrid energy storage is calculated; 3), a charge state grade of the super capacitor is determined according to an actual charge state of the super capacitor, and a reference output power of the super capacitor is calculated according to the charge state grade of the super capacitor; and 4), a output power of a storage battery set in the grid-connected micro power grid is adjusted according to the reference output power of the super capacitor acquired in the step 3), and grid-connected micro power grid energy storage control based on smooth control is realized. The method is advantaged in that the output powers of the super capacitor and the storage battery set can be adaptively changed.

Description

A kind of grid type micro-capacitance sensor energy storage control method based on smooth control

Technical field

The invention belongs to Coordinated Control field between energy-storage travelling wave tube in micro-capacitance sensor, be related to it is a kind of based on smooth control and Net type micro-capacitance sensor energy storage control method.

Background technology

In the grid type micro-capacitance sensor of ultracapacitor, accumulator battery, photovoltaic array and wind-driven generator composition, photovoltaic battle array The output of row and wind-driven generator is affected larger by meteorological condition, goes out can the power that exchanged between micro-capacitance sensor and bulk power grid Now fluctuate, the stable operation, the quality of power supply on bulk power grid causes certain impact.Therefore, it is necessary to pass through hybrid energy-storing element it Between cooperation stabilizing the wave component that micro-capacitance sensor exchanges power with bulk power grid.

Conventional grid type hybrid energy-storing control strategy is often based upon energy-storage travelling wave tube and is in schedulable state, for storage The too high or too low situation of energy element storing electricity, it is considered to relatively simple.

Under the management of traditional limit value, once the state-of-charge of ultracapacitor reaches limit value, ultracapacitor quilt will be caused Compel to limit operation, so as to lose its ability for effectively adjusting altofrequency power swing.So, send out will photovoltaic array and wind-force The undulate quantity of output power of motor is all compensated by accumulator battery.Meanwhile, it is to ensure super if control strategy selects unreasonable Capacitor state-of-charge is maintained in limits, it will continually adjust exerting oneself for accumulator battery.These can all make accumulator The running environment of group becomes more severe.

Therefore, it is stable, effectively adjustment ultracapacitor state-of-charge, it would be highly desirable to propose that one kind can be super with adaptively changing The control strategy of level capacitor state-of-charge, is frequently adjusted so as to avoid exerting oneself accumulator battery, improves accumulator battery Running environment.

The content of the invention

It is an object of the invention to overcome the shortcoming of above-mentioned prior art, there is provided a kind of grid type based on smooth control Micro-capacitance sensor energy storage control method, the method is capable of the output of adaptively changing ultracapacitor and accumulator battery.

To reach above-mentioned purpose, the grid type micro-capacitance sensor energy storage control method based on smooth control of the present invention includes Following steps：

1) the actual state of charge information and photovoltaic array, wind-driven generator of ultracapacitor in grid type micro-capacitance sensor are detected And the power information that ultracapacitor is exported to grid type micro-capacitance sensor；

2) by step 1) work(that exports to grid type micro-capacitance sensor of the photovoltaic array, wind-driven generator and the ultracapacitor that obtain Rate information carries out first-order filtering process, obtains the power swing component P that hybrid energy-storing needs to stabilize_ESS；

3) the state-of-charge grade of ultracapacitor is judged according to the actual state-of-charge of ultracapacitor, then according to super The charge level of level capacitor calculates the reference output power of ultracapacitor；

4) according to step 3) reference output power of calculated ultracapacitor adjusts electric power storage in grid type micro-capacitance sensor The output of pond group, realizes based on the grid type micro-capacitance sensor energy storage control of smooth control.

Step 2) in hybrid energy-storing need the power swing component P that stabilizes_ESSExpression formula be：

Wherein, T₁To control the time constant of outer shroud, P_PVAnd P_WTThe respectively output work of photovoltaic array and wind-driven generator Rate,For the frequency domain presentation of first-order filtering process.

When the state-of-charge of ultracapacitor is less than default one-level limit value ε₁, i.e.,

max{|SOC_SC-SOC_SCmin|,|SOC_SC-SOC_SCmax|}<ε₁ (2)

The then reference output power P of ultracapacitor_SCrefExpression formula be

Wherein, SOC_SC、SOC_SCmaxAnd SOC_SCminThe respectively actual value of ultracapacitor state-of-charge, maximum and most Little value, T₂To control the time constant of internal ring, P_S′_CrefIt is the reference output work of the ultracapacitor obtained without amplitude limit link Rate, P_SCmaxAnd P_SCminThe respectively peak and minimum of the exportable power of ultracapacitor, P_SCrefIt is through amplitude limit link The reference output power of the ultracapacitor for obtaining afterwards.

When the state-of-charge of ultracapacitor is more than or equal to default one-level limit value ε₁And less than default two grades of limit value ε₂Between, I.e.

ε₁≤max{|SOC_SC-SOC_SCmin|,|SOC_SC-SOC_SCmax|}≤ε₂ (5)

The then reference output power P of ultracapacitor_SCrefFor：

Wherein, X refers to coefficient for power, and k is proportionality coefficient, SOC_SCrefFor the state-of-charge reference value of ultracapacitor, T_normal、T_maxAnd T_minRespectively control normal value, maximum and the minima of internal ring time constant.

When the state-of-charge of ultracapacitor is more than default two grades of limit value ε₂, i.e.,

max{|SOC_SC-SOC_SCmin|,|SOC_SC-SOC_SCmax|}>ε₂ (10)

The then reference output power P of ultracapacitor_SCrefExpression formula be：

Wherein, K_pAnd K_iThe respectively proportionality coefficient and integration time constant of state limit link.

The invention has the advantages that：

Grid type micro-capacitance sensor energy storage control method based on smooth control of the present invention in concrete operations, with super Capacitor state-of-charge judges the charged shape of ultracapacitor as controlled device according to the actual state-of-charge of ultracapacitor State grade, is then calculated the reference output power of ultracapacitor according to the charge level of ultracapacitor, adjusts super The actual reference of capacitor and accumulator battery is exerted oneself, and the state-of-charge for making ultracapacitor recovers to reference levels, reaches effectively Stabilize the effect of power swing component, it is ensured that ultracapacitor in can discharge and recharge state, realize to ultracapacitor and storage The self-adaptative adjustment of cell stack power output, improves the running environment of accumulator battery.

Description of the drawings

Fig. 1 is the flow chart of the present invention；

Fig. 2 is the control block diagram of the present invention.

Specific embodiment

The present invention is described in further detail below in conjunction with the accompanying drawings：

With reference to Fig. 1, the grid type micro-capacitance sensor energy storage control method based on smooth control of the present invention includes following step Suddenly：

1) the actual state of charge information and photovoltaic array, wind-driven generator of ultracapacitor in grid type micro-capacitance sensor are detected And the power information that ultracapacitor is exported to grid type micro-capacitance sensor；

2) by step 1) work(that exports to grid type micro-capacitance sensor of the photovoltaic array, wind-driven generator and the ultracapacitor that obtain Rate information carries out first-order filtering process, obtains the power swing component P that hybrid energy-storing needs to stabilize_ESS；

3) the state-of-charge grade of ultracapacitor is judged according to the actual state-of-charge of ultracapacitor, then according to super The charge level of level capacitor calculates the reference output power of ultracapacitor；

4) according to step 3) reference output power of calculated ultracapacitor adjusts electric power storage in grid type micro-capacitance sensor The output of pond group, realizes based on the grid type micro-capacitance sensor energy storage control of smooth control.

Step 2) in hybrid energy-storing need the power swing component P that stabilizes_ESSExpression formula be：

Wherein, T₁To control the time constant of outer shroud, P_PVAnd P_WTThe respectively output work of photovoltaic array and wind-driven generator Rate.For the frequency domain presentation of first-order filtering process.

When the state-of-charge of ultracapacitor is less than default one-level limit value ε₁, i.e.,

max{|SOC_SC-SOC_SCmin|,|SOC_SC-SOC_SCmax|}<ε₁ (2)

The then reference output power P of ultracapacitor_SCrefExpression formula be

Wherein, SOC_SC、SOC_SCmaxAnd SOC_SCminThe respectively actual value of ultracapacitor state-of-charge, maximum and most Little value, T₂To control the time constant of internal ring, P_S′_CrefIt is the reference output work of the ultracapacitor obtained without amplitude limit link Rate, P_SCmaxAnd P_SCminThe respectively peak and minimum of the exportable power of ultracapacitor, P_SCrefIt is through amplitude limit link The reference output power of the ultracapacitor for obtaining afterwards.

When the state-of-charge of ultracapacitor is more than or equal to default one-level limit value ε₁And less than default two grades of limit value ε₂Between, I.e.

ε₁≤max{|SOC_SC-SOC_SCmin|,|SOC_SC-SOC_SCmax|}≤ε₂ (5)

The then reference output power P of ultracapacitor_SCrefFor：

Wherein, X refers to coefficient for power, and k is proportionality coefficient, SOC_SCrefFor the state-of-charge reference value of ultracapacitor, T_normal、T_maxAnd T_minRespectively control normal value, maximum and the minima of internal ring time constant.

When the state-of-charge of ultracapacitor is more than default two grades of limit value ε₂, i.e.,

max{|SOC_SC-SOC_SCmin|,|SOC_SC-SOC_SCmax|}>ε₂ (10)

The then reference output power P of ultracapacitor_SCrefExpression formula be：

Wherein, K_pAnd K_iThe respectively proportionality coefficient and integration time constant of state limit link.

Claims (5)

1. a kind of grid type micro-capacitance sensor energy storage control method based on smooth control, it is characterised in that comprise the following steps：

1) the actual state of charge information and photovoltaic array of ultracapacitor in grid type micro-capacitance sensor, wind-driven generator and super are detected The power information that level capacitor is exported to grid type micro-capacitance sensor；

2) by step 1) photovoltaic array, wind-driven generator and the ultracapacitor that obtain believe to the power that grid type micro-capacitance sensor is exported Breath carries out first-order filtering process, obtains the power swing component P that hybrid energy-storing needs to stabilize_ESS；

3) the state-of-charge grade of ultracapacitor is judged according to the actual state-of-charge of ultracapacitor, then according to super electricity The charge level of container calculates the reference output power of ultracapacitor；

4) according to step 3) reference output power of calculated ultracapacitor adjusts accumulator battery in grid type micro-capacitance sensor Output, realize based on the grid type micro-capacitance sensor energy storage control of smooth control.

2. the grid type micro-capacitance sensor energy storage control method based on smooth control according to claim 1, it is characterised in that step It is rapid 2) in hybrid energy-storing need the power swing component P that stabilizes_ESSExpression formula be：

$P_{ESS}=(1-\frac{1}{1+T_{1}s})(P_{PV}+P_{WT})---\left(1\right)$

Wherein, T₁To control the time constant of outer shroud, P_PVAnd P_WTThe respectively output of photovoltaic array and wind-driven generator,For the frequency domain presentation of first-order filtering process.

3. the grid type micro-capacitance sensor energy storage control method based on smooth control according to claim 1, it is characterised in that when The state-of-charge of ultracapacitor is less than default one-level limit value ε₁, i.e.,

max{|SOC_SC-SOC_SCmin|,|SOC_SC-SOC_SCmax|}<ε₁ (2)

The then reference output power P of ultracapacitor_SCrefExpression formula be

$P_{SCref}^{\&prime;}=P_{ESS}\frac{T_{2}s}{1+T_{2}s}---\left(3\right)$

$P_{SCref}=\left\{\begin{array}{cc}{P}_{SCmax},& P_{SCref}^{\&prime;}\&GreaterEqual;P_{SCmax}\\ P_{SCref}^{\&prime;},& P_{SCmax}>P_{SCref}^{\&prime;}>P_{SC\min }\\ P_{SC\min },& P_{SCref}^{\&prime;}\&le;P_{SC\min }\end{array}\right.---\left(4\right)$

Wherein, SOC_SC、SOC_SCmaxAnd SOC_SCminThe respectively actual value of ultracapacitor state-of-charge, maximum and minima, T₂To control the time constant of internal ring, P_S′_CrefIt is the reference output power of the ultracapacitor obtained without amplitude limit link, P_SCmax And P_SCminThe respectively peak and minimum of the exportable power of ultracapacitor, P_SCrefIt is to obtain after amplitude limit link Ultracapacitor reference output power.

4. the grid type micro-capacitance sensor energy storage control method based on smooth control according to claim 1, it is characterised in that when The state-of-charge of ultracapacitor is more than or equal to default one-level limit value ε₁And less than default two grades of limit value ε₂Between, i.e.,

ε₁≤max{|SOC_SC-SOC_SCmin|,|SOC_SC-SOC_SCmax|}≤ε₂ (5)

The then reference output power P of ultracapacitor_SCrefFor：

$X=k\frac{\left|{\mathrm{SOC}}_{SCref}-{\mathrm{SOC}}_{SC}\right|}{{\mathrm{SOC}}_{SCref}}---\left(6\right)$

$T_2=\left\{\begin{array}{cc}{T}_{normal}+(1-e^{-X})(T_{\max }-T_{normal}),& {\mathrm{SOC}}_{SC}\&GreaterEqual;{\mathrm{SOC}}_{SCref}\\ T_{normal}+(1-e^{-X})(T_{\min }-T_{normal}),& {\mathrm{SOC}}_{SC}<{\mathrm{SOC}}_{SCref}\end{array}\right.---\left(7\right)$

$P_{SCref}^{\&prime;}=P_{ESS}\frac{T_{2}s}{1+T_{2}s}---\left(8\right)$

$P_{SCref}=\left\{\begin{array}{cc}{P}_{SCmax},& P_{SCref}^{\&prime;}\&GreaterEqual;P_{SCmax}\\ P_{SCref}^{\&prime;},& P_{SCmax}>P_{SCref}^{\&prime;}>P_{SC\min }\\ P_{SC\min },& P_{SCref}^{\&prime;}\&le;P_{SC\min }\end{array}\right.---\left(9\right)$

Wherein, X refers to coefficient for power, and k is proportionality coefficient, SOC_SCrefFor the state-of-charge reference value of ultracapacitor, T_normal、T_max And T_minRespectively control normal value, maximum and the minima of internal ring time constant.

5. the grid type micro-capacitance sensor energy storage control method based on smooth control according to claim 1, it is characterised in that when The state-of-charge of ultracapacitor is more than default two grades of limit value ε₂, i.e.,

max{|SOC_SC-SOC_SCmin|,|SOC_SC-SOC_SCmax|}>ε₂ (10)

The then reference output power P of ultracapacitor_SCrefExpression formula be：

$P_{SCref}^{\&prime;}=(K_p+\frac{K_i}{s})({\mathrm{SOC}}_{SC}-{\mathrm{SOC}}_{SCref})---\left(11\right)$

$P_{SCref}=\left\{\begin{array}{cc}{P}_{SCmax},& P_{SCref}^{\&prime;}\&GreaterEqual;P_{SCmax}\\ P_{SCref}^{\&prime;},& P_{SCmax}>P_{SCref}^{\&prime;}>P_{SC\min }\\ P_{SC\min },& P_{SCref}^{\&prime;}\&le;P_{SC\min }\end{array}\right.---\left(12\right)$

Wherein, K_pAnd K_iThe respectively proportionality coefficient and integration time constant of state limit link.