CN109842137B - Coordination control method for single-phase and three-phase series-parallel micro-grid group - Google Patents
Coordination control method for single-phase and three-phase series-parallel micro-grid group Download PDFInfo
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Abstract
A coordination control method for a single-phase and three-phase series-parallel micro-grid group comprises the steps of establishing a constant voltage control mathematical model based on proportional resonance control; a double closed loop control scheme of a voltage outer loop and a current inner loop is adopted; collecting three-phase power information and judging the three-phase unbalance; and the secondary control coordinates the transmission power between the three single-phase micro-grids and the three-phase micro-grid. The coordination control method for the single-phase and three-phase series-parallel micro-grid group has the advantages that the primary control structure is simple, the realization is easy, the coordinate rotation is not needed for multiple times, and the realization difficulty of a control algorithm is reduced; the secondary control directly adjusts the power of the public coupling point of the microgrid group, the operation is simple, the static error can be better eliminated, and a better control effect can be obtained when the problem of unbalanced voltage of the microgrid group is solved.
Description
Technical Field
The invention belongs to the technical field of micro-grid control, and particularly relates to a coordination control method for a single-phase and three-phase series-parallel micro-grid group.
Background
With the expansion of the application scale of the micro-grid, in order to meet more demands of users, a single-three-phase series-parallel micro-grid group formed by connecting a three-phase micro-grid and single micro-grids with various phase sequences in series-parallel gradually appears at the present stage. The single-three-phase series-parallel micro-grid group improves the reliability, economy and stability of important loads of power utilization of users in a region range on the basis of the existing micro-grid. The unbalanced voltage phenomenon can appear when the unbalanced load is connected into in the microgrid group, and the unbalanced voltage can influence the normal operation of each equipment in the microgrid group. In order to ensure the normal operation of the devices in the microgrid group, it is necessary to carry out deep research on the problem of voltage imbalance.
In the prior art documents:
the design of zero-sequence circulating current and the compensation of delta-connected constant generator for unbalanced load (Ma Fujun, Luo An, Xiong Qiaopo, et al, design of zero-sequence circulating current and the compensation of delta-connected constant generator for unbalanced load [ J ]. IET Power Electronics, 2016, 9 (3): 576-588.) solves the problems of three-phase Power imbalance and voltage fluctuation by installing An electric energy quality compensation device, although the effect is obvious, the investment and operation cost is high.
Flexible Active Power Control of Distributed Power Generation Systems During Grid Faults (Rodriguez P, Timbus A V, Teoderescu R, et al. Flexible Active Power Control of Distributed Power Generation Systems During Grid Faults [ J ]. IEEE Transactions on Industrial Electronics,2007,54(5): 2583-.
Grid-Fault Control Scheme for Three-Phase Photovoltaic Inverters With Adjustable Power consumption Characteristics (Castilla M, Miret J, Sosa J L, et al, Grid-Fault Control Scheme for Three-Phase Photovoltaic inverter With Adjustable Power consumption Characteristics [ J ]. IEEE Transactions on Power Electronics,2010,25(12): 2930-.
A coherent impedance Compensation Method for Distributed-Generation Interface Converters (Po-Tai Cheng, Chien-An Chen, Tzung-Lin Lee, et al. A coherent impedance Compensation Method for Distributed-Generation Interface Converters [ J ]. IEEE Transactions on Industrial Applications,2007,45(2):805-815.) to achieve unbalanced control, a droop control strategy for adding a negative-sequence reactive power-conductance loop is proposed, which has a limited effect on output voltage regulation and a compromise between unbalanced Compensation and voltage precision, which results in An suboptimal voltage Compensation effect.
Disclosure of Invention
In order to solve the technical problems, the invention provides a coordination control method of a single-phase and three-phase series-parallel micro-grid group, which has the advantages that the primary control structure is simple, the realization is easy, the coordinate does not need to be rotated for many times, and the realization difficulty of a control algorithm is reduced; the secondary control directly adjusts the power of the public coupling point of the microgrid group, the operation is simple, the static error can be better eliminated, and a better control effect can be obtained when the problem of unbalanced voltage of the microgrid group is solved.
The technical scheme adopted by the invention is as follows:
a coordination control method for a single-phase and three-phase series-parallel micro-grid group comprises the following steps:
wherein: s is a complex frequency domain operator, kpIs a constant of proportionality, kiIs an integration constant; omega0Is the resonant frequency.
And 2, controlling the proportional resonance controller in a static coordinate system, tracking the sinusoidal reference current in an alpha beta coordinate system, and controlling the proportional resonance to have infinite gain at the fundamental frequency, so that zero steady-state error can be realized, and coupling and decoupling operation is avoided.
Step 3, adopting double closed-loop control of a voltage outer ring and a current inner ring, wherein the double closed-loop control adopts a proportional resonance control method, wherein the voltage outer ring is used for adjusting the amplitude of the output voltage to ensure the precision of the effective value of the output voltage; and outputting the result of the voltage outer ring as a current reference input instruction of the current inner ring.
And 4, collecting voltage and current information at the point of the common coupling, calculating power, and judging the degree of unbalance. The constraint equation of the transmission power unbalance between the buses of each phase is as follows:
wherein:
in the above-mentioned equation, the equation,
for the output power of each phase in the three-phase microgrid 1,
is the average power of the three-phase microgrid,
is the output power of each phase of the energy storage device in the three-phase microgrid 1,
the output power of each phase of the photovoltaic power generation unit in the three-phase microgrid 1.
When the degree of unbalance is less than or equal to 5 percent, the transmission power at the point of common coupling does not need to be coordinated by secondary control.
When the degree of imbalance is > 5%, then secondary control is required to coordinate the transmission power at the point of common coupling.
And 5, coordinating transmission power between the three single-phase micro-grids and the three-phase micro-grids by secondary control, wherein a target optimization function of the secondary control is as follows:
wherein epsilonjCoefficient of energy storage output power function, alpha, for three-phase microgridfCoefficient of energy storage output power function, mu, for single-phase microgridiCoefficient of photovoltaic output power function, beta, of three-phase microgridgThe coefficient is a photovoltaic output power function of the single-phase micro-grid;
outputting power for the energy storage of the single-phase micro-grid and the three-phase micro-grid;
the photovoltaic output power of the single-phase micro-grid and the three-phase micro-grid.
The secondary control is to meet the adjustment quantity of the transmission power at the point of the public coupling by changing the photovoltaic output power in each single-phase micro-grid, and when the photovoltaic output power cannot meet the adjustment quantity of the transmission power at the point of the public coupling, the photovoltaic output power is combined with the energy storage device, and the transmission power at the point of the public coupling is met through the combined action of the photovoltaic power generation unit and the energy storage device, so that the problem of voltage imbalance at the point of the public coupling is solved.
According to the coordination control method of the single-phase and three-phase series-parallel micro-grid group, the primary control adopts Proportional Resonance (PR) control, and a proportional resonance controller can realize no-static-error control on alternating current signals under a static coordinate system and has the capability of resisting voltage fluctuation of a power grid. Under the condition of fully utilizing renewable energy sources to generate electricity, the secondary control acts on the transmission power at the public coupling point of the microgrid group to realize the control of unbalanced voltage. The method can keep the voltage of the microgrid group stable, and can obtain a good control effect when the voltage of the microgrid group is unbalanced.
Drawings
Fig. 1 is a structure diagram of single-three-phase series-parallel micro-grid group control.
Fig. 2 is a block diagram of a primary control architecture.
Fig. 3 is an imbalance comparison diagram of the microgrid group under different control strategies.
Detailed Description
A coordination control method for a single-phase and three-phase series-parallel micro-grid group comprises the following steps:
wherein: s is a complex frequency domain operator, kpIs a constant of proportionality, kiIs an integration constant; omega0Is the resonant frequency.
And 2, controlling the proportional resonance controller in a static coordinate system, wherein the PR control avoids complex abc-dq coordinate transformation, the sinusoidal reference current is tracked in an alpha beta coordinate system, and the proportional resonance control has infinite gain at the fundamental frequency, so that zero steady-state error can be realized, and coupling and decoupling operation is avoided.
Step 3, adopting double closed-loop control of a voltage outer ring and a current inner ring, wherein in order to realize constant voltage control, the double closed-loop control adopts a proportional resonance control method, wherein the voltage outer ring is used for adjusting the amplitude of the output voltage, and the precision of the effective value of the output voltage is ensured; and outputting the result of the voltage outer ring as a current reference input instruction of the current inner ring.
And 4, collecting voltage and current information at the point of the common coupling, calculating power, and judging the degree of unbalance. The constraint equation of the transmission power unbalance between the buses of each phase is as follows:
wherein:
in the aboveIn the equation, the ratio of the total of the components,
for the output power of each phase in the three-phase microgrid 1,
is the average power of the three-phase microgrid,
is the output power of each phase of the energy storage device in the three-phase microgrid 1,
the output power of each phase of the photovoltaic power generation unit in the three-phase microgrid 1.
When the degree of unbalance is less than or equal to 5 percent, the transmission power at the point of common coupling does not need to be coordinated by secondary control.
When the degree of imbalance is > 5%, then secondary control is required to coordinate the transmission power at the point of common coupling.
And 5, coordinating transmission power between the three single-phase micro-grids and the three-phase micro-grids by secondary control, wherein a target optimization function of the secondary control is as follows:
wherein epsilonjCoefficient of energy storage output power function, alpha, for three-phase microgridfCoefficient of energy storage output power function, mu, for single-phase microgridiCoefficient of photovoltaic output power function, beta, of three-phase microgridgIs the coefficient of the photovoltaic output power function of the single-phase micro-grid.
The secondary control is to meet the adjustment quantity of the transmission power at the point of the public coupling by changing the photovoltaic output power in each single-phase micro-grid, and when the photovoltaic output power cannot meet the adjustment quantity of the transmission power at the point of the public coupling, the photovoltaic output power is combined with the energy storage device, and the transmission power at the point of the public coupling is met through the combined action of the photovoltaic power generation unit and the energy storage device, so that the problem of voltage imbalance at the point of the public coupling is solved.
The energy storage constraint conditions of the secondary control are as follows:
wherein,
the minimum value and the maximum value of the energy storage output power of the single-phase micro-grid are obtained,
the power is output for the single-phase micro-grid energy storage,
the minimum value and the maximum value of the energy storage output power of the three-phase micro-grid are obtained,
the energy is stored and the power is output for the three-phase micro-grid,
the minimum value and the maximum value of the energy storage charge state of the single-phase micro-grid,
is an energy storage charge state of a single-phase micro-grid,
the minimum value and the maximum value of the energy storage charge state of the three-phase micro-grid,
and the energy storage charge state of the three-phase micro-grid is obtained.
The photovoltaic constraint conditions are as follows:
wherein,
the minimum value and the maximum value of the photovoltaic output power of the single-phase micro-grid and the minimum value and the maximum value of the photovoltaic output power of the three-phase micro-grid are obtained;
is the photovoltaic output power of the single-phase micro-grid,
the photovoltaic output power of the three-phase micro-grid.
The power balance constraint conditions are as follows:
phase A:
phase B:
and C phase:
wherein:
is the energy storage output power of an A-phase single-phase micro-grid 2, a B-phase single-phase micro-grid 3 and a C-phase single-phase micro-grid 4,
is the photovoltaic output power of an A-phase single-phase microgrid 2, a B-phase single-phase microgrid 3 and a C-phase single-phase microgrid 4,
the load power of each phase of the microgrid group is obtained,
for the energy storage output power of each phase of the three-phase microgrid 1,
the photovoltaic output power of each phase of the three-phase micro-grid 1.
Fig. 1 is a structure diagram of single-three-phase series-parallel micro-grid group control. The microgrid group is composed of 4 microgrids, wherein a three-phase microgrid 1 is a three-phase microgrid and plays a leading role in the whole multi-microgrid and comprises an energy storage device, a photovoltaic power generation unit and a three-phase load. The A-phase single-phase microgrid 2, the B-phase single-phase microgrid 3 and the C-phase single-phase microgrid 4 are single-phase microgrids and are respectively and independently connected with A, B, C three phases of the three-phase microgrid 1. The whole microgrid group is connected with a power distribution network through an on-grid and off-grid switch L1. When the grid-connected and grid-disconnected switch L1 is disconnected, the microgrid group is in an island operation mode, the A-phase single-phase microgrid 2, the B-phase single-phase microgrid 3 and the C-phase single-phase microgrid 4 are still connected in the three-phase microgrid 1, and the main power stored energy in the three-phase microgrid 1 provides voltage and frequency support for the whole microgrid group.
The primary control utilizes a proportional resonant controller and voltage and current double closed-loop control to achieve the purpose of constant voltage control, and the secondary control controls unbalanced voltage by jointly coordinating the transmission power of the three-phase microgrid and the three single-phase microgrid common coupling points. When transmission power is not balanced>When the power consumption is 5 percent, firstly calculating the adjustment quantity delta P of the transmission power at the public coupling points of the A-phase single-phase microgrid 2, the B-phase single-phase microgrid 3, the C-phase single-phase microgrid 4 and the three-phase microgrid 11、△P2、△P3Then the adjustable quantity delta P of the photovoltaic output power of the single-phase micro-grids 2, 3 and 4 is comparedPVAnd an adjustment amount Δ P of transmission power.
When the adjustable quantity delta P of each photovoltaic output power in the A-phase single-phase microgrid 2, the B-phase single-phase microgrid 3 and the C-phase single-phase microgrid 4PVAnd when the transmission power adjustment quantity delta P is larger than or equal to the transmission power adjustment quantity delta P, the photovoltaic power generation units of the single micro-grids are directly coordinated. When the adjustable quantity delta P of each photovoltaic output power of the A-phase single-phase microgrid 2, the B-phase single-phase microgrid 3 and the C-phase single-phase microgrid 4PVAnd when the voltage is less than delta P, the three-phase micro-grid and each single micro-grid are coordinated together.
Fig. 2 is a block diagram of a primary control architecture. The primary control adopts a proportional resonant controller, and the control structure is double closed-loop control of a voltage outer loop current inner loop. Firstly, coordinate transformation is carried out on three-phase voltage output by an inverter to a static coordinate, and static-error-free adjustment of a controlled signal is realized through a PR controller. And outputting the result of the voltage outer ring as a current reference input instruction of the current inner ring. The current inner ring forms a current follow-up system, and the dynamic process of resisting disturbance can be greatly accelerated. The voltage and current double closed-loop control makes full use of the state information of the system, and not only has good dynamic performance, but also has high steady-state precision. The transfer function of the proportional resonant controller is:
wherein, Kpv,KivIs the proportional constant and integral constant of the voltage outer loop, Kpi,KiiThe proportional constant and integral constant of the current inner loop. In the invention, the parameters are designed as follows: kpv＝0.4,Kiv＝20,Kii＝0.05,Kpi＝1。
The control method converts the three-phase alternating current control problem into two alternating current control problems, and avoids the positive and negative sequence component decomposition process of the current. Proportional resonant controller at resonant frequency omega0The narrow bandwidth in the vicinity has a high gain, thereby limiting the steady state error between the control signal and the reference signal.
Fig. 3 is a graph of voltage imbalance for a microgrid cluster using a conventional control strategy versus a control strategy proposed by the present invention. The ratio of the positive sequence and negative sequence voltage components is the degree of imbalance. When t is 0.4s, a single-phase unbalanced load (R) is connected into the microgrid groupB＝6Ω，LB4mH), the degree of voltage imbalance based on the conventional control strategy and the control strategy proposed based on this patent is represented by a solid line and a dotted line, respectively, in the figure. As can be seen from fig. 3, after the single-phase load is added when t is 0.4s, the voltage imbalance degree using the conventional control strategy is about 3.8%; the voltage imbalance using the control strategy proposed by the present invention is about 1.9%. The comparison result shows that the double-layer coordination control system and the double-layer coordination control method provided by the invention can obtain a better control effect when processing voltage unbalance.
Claims (2)
1. A coordination control method for a single-phase and three-phase series-parallel micro-grid group is characterized by comprising the following steps:
the microgrid group consists of 4 microgrids, wherein a three-phase microgrid 1 is a three-phase microgrid and plays a leading role in the whole multi-microgrid and comprises an energy storage device, a photovoltaic power generation unit and a three-phase load;
the A-phase single-phase microgrid 2, the B-phase single-phase microgrid 3 and the C-phase single-phase microgrid 4 are single-phase microgrids and are respectively and independently connected with A, B, C three phases of the three-phase microgrid 1; the whole microgrid group is connected with a power distribution network through a grid-connected and off-grid switch L1; when the grid-connected and grid-disconnected switch L1 is disconnected, the microgrid group is in an island operation mode, at the moment, the A-phase single-phase microgrid 2, the B-phase single-phase microgrid 3 and the C-phase single-phase microgrid 4 are still connected in the three-phase microgrid 1, and the main power supply energy storage in the three-phase microgrid 1 provides voltage and frequency support for the whole microgrid group;
the coordination control method of the microgrid group comprises the following steps:
step 1, establishing a constant-pressure control mathematical model based on proportional resonance control, wherein the transfer function of the model is as follows:
wherein: s is a complex frequency domain operator, kpIs a constant of proportionality, kiIs an integration constant; omega0Is the resonant frequency;
step 2, under a static coordinate system, controlling the proportional resonance controller, tracking a sinusoidal reference current under an alpha beta coordinate system, and controlling the proportional resonance to have infinite gain at the fundamental frequency so as to realize zero steady-state error;
step 3, adopting double closed-loop control of a voltage outer ring and a current inner ring, wherein the double closed-loop control adopts a proportional resonance control method, wherein the voltage outer ring is used for adjusting the amplitude of the output voltage to ensure the precision of the effective value of the output voltage; the output result of the voltage outer ring is used as a current reference input instruction of the current inner ring;
step 4, collecting voltage and current information at the point of common coupling, calculating power, and judging the degree of unbalance; the constraint equation of the transmission power unbalance between the buses of each phase is as follows:
wherein:
in the above-mentioned equation, the equation,
for the output power of each phase in the three-phase microgrid 1,
is the average power of the three-phase microgrid,
for the output power of each phase of the energy storage device in the three-phase microgrid 1,
the output power of each phase of the photovoltaic power generation unit in the three-phase microgrid 1 is obtained;
when the degree of unbalance is less than or equal to 5 percent, the transmission power at the point of common coupling does not need to be coordinated by secondary control;
when the degree of unbalance is greater than 5%, secondary control is needed to coordinate the transmission power at the point of common coupling;
and 5, coordinating transmission power between the three single-phase micro-grids and the three-phase micro-grids by secondary control, wherein a target optimization function of the secondary control is as follows:
wherein epsilonjCoefficient of energy storage output power function, alpha, for three-phase microgridfCoefficient of energy storage output power function, mu, for single-phase microgridiCoefficient of photovoltaic output power function, beta, of three-phase microgridgThe coefficient is a photovoltaic output power function of the single-phase micro-grid;
outputting power for the energy storage of the single-phase micro-grid and the three-phase micro-grid;
photovoltaic output power for single-phase and three-phase microgrid;
the secondary control is to meet the adjustment quantity of the transmission power at the point of the public coupling by changing the photovoltaic output power in each single-phase microgrid, and when the photovoltaic output power cannot meet the adjustment quantity of the transmission power at the point of the public coupling, the photovoltaic output power is combined with the energy storage device to meet the transmission power at the point of the public coupling through the combined action of the photovoltaic power generation unit and the energy storage device.
2. The coordination control method of the single-three-phase series-parallel micro grid group according to claim 1, characterized in that:
the energy storage constraint conditions of the secondary control are as follows:
wherein,
the minimum value and the maximum value of the energy storage output power of the single-phase micro-grid are obtained,
the energy is stored for all the single-phase micro-grids to output power,
the minimum value and the maximum value of the energy storage output power of the three-phase micro-grid are obtained,
the energy is stored and the power is output for the three-phase micro-grid,
the minimum value and the maximum value of the energy storage charge state of the single-phase micro-grid,
is an energy storage charge state of a single-phase micro-grid,
the minimum value and the maximum value of the energy storage charge state of the three-phase micro-grid,
storing energy charge states for a three-phase microgrid;
the photovoltaic constraint conditions are as follows:
wherein,
the minimum value and the maximum value of the photovoltaic output power of the single-phase micro-grid and the minimum value and the maximum value of the photovoltaic output power of the three-phase micro-grid are obtained;
is the photovoltaic output power of the single-phase micro-grid,
the photovoltaic output power of the three-phase micro-grid;
the power balance constraint conditions are as follows:
phase A:
phase B:
and C phase:
wherein:
is the energy storage output power of an A-phase single-phase micro-grid 2, a B-phase single-phase micro-grid 3 and a C-phase single-phase micro-grid 4,
is the photovoltaic output power of an A-phase single-phase microgrid 2, a B-phase single-phase microgrid 3 and a C-phase single-phase microgrid 4,
the load power of each phase of the microgrid group is obtained,
for the stored energy output power of each phase of the three-phase microgrid 1，
The photovoltaic output power of each phase of the three-phase micro-grid 1.
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