CN-122000852-A - Electric-hydrogen hybrid energy storage island micro-grid power coordination control method

CN122000852ACN 122000852 ACN122000852 ACN 122000852ACN-122000852-A

Abstract

The invention discloses a power coordination control method for an electric-hydrogen hybrid energy storage island micro-grid, and belongs to the technical field of electric-hydrogen hybrid energy storage island micro-grid control. The method comprises the steps of obtaining system electrical parameters and alkaline electrolytic tank operation temperature in real time, dividing five operation modes of the electrolytic tank according to direct current bus voltage, executing self-adaptive droop control on the electrolytic tank by combining the operation temperature and the bus voltage, executing virtual synchronous generator-like control containing virtual damping and virtual inertia on an energy storage unit based on the bus voltage and the voltage change rate, and stabilizing power fluctuation through the synergistic effect of the two. The invention is mainly used for power coordination control of the electric-hydrogen hybrid energy storage island micro-grid, can maintain the voltage stability of the direct-current bus, prolongs the service life of the electrolytic tank and improves the running reliability of the micro-grid.

Inventors

SHU JIE
TIAN SHUO
MA ZETAO
BIE KANG
WANG TINGTING
WU CHANGHONG

Assignees

中国科学院广州能源研究所

Dates

Publication Date: 20260508
Application Date: 20260129

Claims (10)

1. The electric-hydrogen hybrid energy storage island micro-grid power coordination control method is characterized by comprising the following steps of: acquiring system operation parameters and alkaline electrolysis bath operation temperature in real time, wherein the system operation parameters comprise direct current bus voltage; dividing the operation mode of the alkaline electrolytic cell according to the DC bus voltage; performing self-adaptive droop control on the alkaline electrolytic cell by using the operating temperature and the direct current bus voltage to obtain an electrolytic cell operating power reference value; Based on the direct current bus voltage and the voltage change rate, performing virtual-like synchronous generator control containing virtual damping and virtual inertia on the energy storage unit to obtain an energy storage unit voltage outer ring reference value; and the operating power reference value of the electrolytic tank and the voltage outer ring reference value of the energy storage unit cooperate to stabilize the power fluctuation of the system, so that the voltage stability of the direct current bus is maintained.
2. The method according to claim 1, wherein the DC bus voltage is measured by a voltage sensor and the bus side output current and the battery side input current of the DC-DC converter in the energy storage unit and the input current and the input voltage of the alkaline electrolyzer are measured by a current sensor when the system operating parameters are obtained, and the temperature sensor is used for obtaining the operating temperature of the alkaline electrolyzer.
3. The method according to claim 1, wherein when the operation mode of the alkaline electrolytic cell is divided, the operation mode is divided into a constant power operation mode, a busbar voltage rising droop control mode, a busbar voltage falling droop control mode, a maximum power operation mode, and a minimum power operation mode according to a preset range in which the direct current busbar voltage is located.
4. The method of claim 3, wherein the mode is determined when the constant power operation mode is determined, wherein the mode is determined when the dc bus voltage is within a first predetermined range, wherein the mode is determined when the bus voltage sag control mode is determined when the dc bus voltage is within a second predetermined range, wherein the mode is determined when the bus voltage sag control mode is determined, wherein the mode is determined when the dc bus voltage is within a third predetermined range, wherein the mode is determined when the maximum power operation mode is determined, wherein the mode is determined when the dc bus voltage reaches an upper safe operation limit, and wherein the mode is determined when the minimum power operation mode is determined, wherein the mode is determined when the dc bus voltage reaches a lower safe operation limit.
5. The method of claim 1, wherein the adaptive droop control is performed by calculating a cell operating power reference value using an adaptive droop control law for a constant power operating mode, a bus voltage rise droop control mode, and a bus voltage droop control mode, the adaptive droop control law being constructed in combination with a droop factor, a dc bus voltage, a dc bus nominal voltage, and a power reference value.
6. The method of claim 5, wherein the maximum power of the alkaline electrolyzer is obtained by fitting the current operating temperature when calculating the reference value of the operating power of the electrolyzer, the minimum power of the alkaline electrolyzer is set to a preset proportion of the rated power of the alkaline electrolyzer, and the range of the reference value of the operating power of the electrolyzer is defined by the maximum power and the minimum power.
7. The method of claim 1, wherein the virtual synchronous generator-like control is performed by constructing a control law of an energy storage unit voltage outer ring reference value based on a direct current bus rated voltage, a virtual damping, a virtual inertia and a direct current bus voltage, wherein the virtual damping and the virtual inertia are dynamically adjusted according to an initial value, an adjustment coefficient and a direct current bus voltage change rate in a steady state.
8. The method of claim 7, wherein the virtual damping is calculated by using a virtual damping initial value and an adjustment coefficient in a steady state in combination with a DC bus voltage change rate, and the virtual inertia is calculated by using a virtual inertia initial value and an adjustment coefficient in a steady state in combination with a DC bus voltage change rate.
9. The method of claim 1, wherein when the system power fluctuation is stabilized cooperatively, the input power of the alkaline electrolytic cell is regulated by the reference value of the operating power of the electrolytic cell, the charge and discharge power of the energy storage unit is regulated by the reference value of the voltage outer ring of the energy storage unit, and the direct current bus voltage fluctuation is restrained by the cooperation of the two components in response to the system source load power change.
10. The method of claim 5, wherein the power reference is given by a system output schedule, and wherein the sag factor is set based on operating characteristics of the alkaline electrolyzer and system stability requirements for balancing power conditioning sensitivity with system stability.

Description

Electric-hydrogen hybrid energy storage island micro-grid power coordination control method Technical Field The invention belongs to the technical field of micro-grid control, and particularly relates to the technical field of power coordination control of an electro-hydrogen hybrid energy storage island micro-grid. Background Along with the prominence of energy crisis and environmental pollution problems, renewable clean energy represented by solar energy and wind energy is increasingly widely applied in the field of distributed power generation, and the renewable clean energy can optimize the traditional energy structure and promote the sustainable development of energy economy and environment. The hydrogen is used as clean energy, has the characteristics of high energy density, large capacity and convenient storage and transmission, and can be used as energy medium for assisting the efficient utilization of renewable energy, thereby accelerating the development of the electric hydrogen hybrid energy storage island micro-grid. The electric-hydrogen hybrid energy storage island micro-grid needs to be separated from a main network to independently operate, and the power fluctuation of the system completely depends on self regulation, so that higher requirements are provided for a control strategy. However, the new energy power generation has intermittence and fluctuation, and the electrolytic hydrogen production load has specific requirements on power supply, so that the problems of bus voltage fluctuation, power distribution non-uniformity and the like easily occur in the running process of the existing micro-grid. The control strategy for the micro-grid is not fully adapted to the system characteristics at present, on one hand, the influence of the operation temperature of the alkaline electrolytic cell on the output force of the alkaline electrolytic cell cannot be considered, and the control parameters cannot be dynamically adjusted according to the temperature change, on the other hand, the coordination control mechanism of the energy storage unit and the electrolytic cell is not perfect enough, and the power impact caused by the fluctuation of renewable energy sources is difficult to effectively stabilize, so that the fluctuation of the power of the electrolytic cell is large, the hydrogen production stability is influenced, the service life of equipment is possibly shortened, and meanwhile, the unstable bus voltage also influences the reliable operation of the whole micro-grid. How to formulate a coordination control strategy for adapting to characteristics of an electric hydrogen hybrid energy storage island micro-grid, balance new energy fluctuation and equipment response speed, and inhibit busbar voltage and equipment power fluctuation becomes a technical problem to be solved urgently in the field. Disclosure of Invention The invention aims to provide a power coordination control method for an electric-hydrogen hybrid energy storage island micro-grid, which is used for solving the problems of busbar voltage fluctuation and electrolytic tank power fluctuation caused by renewable energy fluctuation, improving the running stability of the micro-grid and prolonging the service life of equipment. In order to achieve the above purpose, the present invention provides the following technical solutions: an electric-hydrogen hybrid energy storage island micro-grid power coordination control method comprises the following steps: acquiring system operation parameters and alkaline electrolysis bath operation temperature in real time, wherein the system operation parameters comprise direct current bus voltage; dividing the operation mode of the alkaline electrolytic cell according to the DC bus voltage; performing self-adaptive droop control on the alkaline electrolytic cell by using the operating temperature and the direct current bus voltage to obtain an electrolytic cell operating power reference value; Based on the direct current bus voltage and the voltage change rate, performing virtual-like synchronous generator control containing virtual damping and virtual inertia on the energy storage unit to obtain an energy storage unit voltage outer ring reference value; and the operating power reference value of the electrolytic tank and the voltage outer ring reference value of the energy storage unit cooperate to stabilize the power fluctuation of the system, so that the voltage stability of the direct current bus is maintained. In one possible implementation, when the system operation parameters are obtained, the voltage of the direct current bus is measured through a voltage sensor, the bus side output current and the battery side input current of the DC-DC converter in the energy storage unit are measured through a current sensor, and the input current and the input voltage of the alkaline electrolytic cell are measured through a temperature sensor when the operation temperature of the alkaline electrolytic c