CN-122026416-A - Multi-reactive-power-equipment-coordinated power grid voltage control method and system

CN122026416ACN 122026416 ACN122026416 ACN 122026416ACN-122026416-A

Abstract

The invention belongs to the technical field of power systems, and relates to a power grid voltage control method and system with cooperation of multiple reactive power devices, wherein response time characteristics of each reactive power device are obtained, and the multiple reactive power devices are divided into a first type of device and a second type of device according to the response time characteristics; when the voltage offset is detected, the first type equipment is preferentially controlled to execute initial voltage adjustment, the starting time of the second type equipment is determined according to the matching degree of the compensation capacity of the first type equipment and the voltage offset, and the second type equipment is controlled to execute supplementary voltage adjustment according to the starting time, so that the reactive power output of the second type equipment is staggered with the first type equipment in time. According to the invention, the equipment is divided into two types of fast and slow, the fast equipment is preferentially utilized for initial adjustment, and the starting time of the slow equipment is dynamically determined according to the compensation capability of the fast equipment, so that the reactive outputs of the two types of equipment are staggered in time, interference and conflict generated by simultaneous adjustment are eliminated, the internal consumption of resources is reduced, and the stability and the adjustment efficiency of voltage recovery are improved.

Inventors

CHANG XIAO
NAN XIAOQIANG
ZHAO JUN
ZHANG SHIFENG
WANG LIANG
LI HUIPENG
QI HUIQIANG
GUO XIANGYU

Assignees

国网山西省电力有限公司电力科学研究院

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. The grid voltage control method for cooperation of the multiple reactive devices is characterized by comprising the following steps of: The method comprises the steps of obtaining response time characteristics of reactive power equipment, and dividing the multiple reactive power equipment into first-class equipment and second-class equipment according to the response time characteristics, wherein the response time of the first-class equipment is smaller than that of the second-class equipment; when the voltage deviation of the power grid is detected, the first type of equipment is preferentially controlled to execute initial voltage regulation, and the starting time of the second type of equipment is determined according to the matching degree of the compensation capacity of the first type of equipment and the voltage deviation; And controlling the second type equipment to execute the supplementary voltage regulation according to the starting time, so that the reactive power output of the second type equipment is staggered with the first type equipment in time.
2. A method of grid voltage control in conjunction with a plurality of reactive devices according to claim 1, wherein controlling the first type of device to perform an initial voltage regulation comprises: acquiring current output power and power adjustable upper limit of each reactive equipment in the first type of equipment, and determining the residual capacity of the reactive equipment according to the current output power and the power adjustable upper limit; Calculating a required compensation amount according to the voltage offset; judging whether the residual capacity of the single reactive equipment in the first type of equipment is larger than or equal to the required compensation amount; if the reactive power equipment exists, selecting the reactive power equipment with the minimum residual capacity from the reactive power equipment with the residual capacity larger than or equal to the required compensation amount as execution equipment, and executing initial voltage regulation through the execution equipment; And if the reactive power equipment does not exist, sequentially activating the reactive power equipment according to the residual capacity of each reactive power equipment from large to small.
3. A method of grid voltage control in conjunction with a plurality of reactive devices according to claim 2, wherein performing initial voltage regulation by the performing device comprises: Determining a target output power Q of the execution device according to q=q0+Δq, Q0 representing a current output power of the execution device, Δq representing the required compensation amount; judging whether the target output power Q is smaller than or equal to the power adjustable upper limit of the execution equipment; If yes, the execution device output power Q (t) is controlled as follows: ; t represents the time from the control instruction issue time, τ represents the response time constant of the execution device; If not, the target output power Q is corrected to be the power adjustable upper limit of the execution equipment.
4. The method for controlling the voltage of a power grid in cooperation with a plurality of reactive devices according to claim 2, wherein the reactive devices are activated in sequence from a large remaining capacity to a small remaining capacity, and further comprising inserting an activation time interval between two reactive devices in adjacent activation sequence if an electrical distance between the two reactive devices is smaller than a threshold value, wherein the activation time interval is positively correlated with a sum of response time constants of the two reactive devices.
5. The method for controlling voltage of a power grid coordinated with multiple reactive devices according to claim 1, wherein determining the starting time of the second type of device according to the matching degree of the compensation capability of the first type of device and the voltage offset comprises: acquiring the continuous adjustment duration, the adjustment precision grade and the response time constant of each reactive equipment in the second type of equipment; Screening candidate devices from the second type of devices according to the duration adjustment time length; screening target equipment from the candidate equipment according to the adjustment precision grade, wherein the adjustment precision grade of the target equipment is highest; and determining the starting time of the target equipment according to the maximum response time constant in the first type of equipment and the response time constant of the target equipment.
6. The method of grid voltage control in conjunction with multiple reactive devices of claim 5, wherein determining the start-up time of the target device comprises: t0=ɑ×τ1+β×τ2; t0 represents the starting time of the target equipment, tau 1 represents the maximum response time constant of the first equipment, tau 2 represents the response time constant of the target equipment, alpha represents the response completion coefficient of the first equipment, the value is 3-4, the reactive power output of the first equipment approaches to a steady state value and then the target equipment is started, beta represents the response precompensation coefficient of the second equipment, the value is 0.5-1, and the starting time of the target equipment is advanced from the response completion time of the second equipment to compensate the response lag of the second equipment.
7. The method for controlling the voltage of the power grid coordinated with the multiple reactive devices according to claim 6, wherein after the starting time of the target device is determined, the method further comprises monitoring the voltage fluctuation frequency of the power grid, shortening the value of the first type device response completion coefficient alpha to enable the starting time of the target device to be advanced if the voltage fluctuation frequency exceeds a fluctuation frequency threshold, extending the value of the first type device response completion coefficient alpha to enable the starting time of the target device to be delayed if the voltage fluctuation frequency is lower than the fluctuation frequency threshold, and updating the starting time of the target device according to the adjusted first type device response completion coefficient.
8. The method for grid voltage control in conjunction with multiple reactive devices according to claim 6, further comprising, prior to determining the start-up time of the target device: calculating an electrical distance d between the target device and a voltage offset monitoring point; Acquiring the minimum electrical distance dmin between all activated devices and a voltage offset monitoring point in the first type of devices; calculating an electrical distance coefficient eta, eta=d/dmin; If the electric distance coefficient is larger than the coefficient threshold, the starting time of the target equipment is corrected to be t1=t0-lambda× (d-dmin), t1 represents the corrected starting time, lambda represents the advance coefficient, the value is 0-1 multiplied by 10 -3 seconds/km, and the coefficient threshold value is 1.0-1.6.
9. The method for controlling the voltage of a power grid coordinated with a plurality of reactive devices according to claim 1, wherein the dividing the plurality of reactive devices into a first type of devices and a second type of devices according to the response time characteristics comprises: Acquiring response delay time of each reactive power equipment, and calculating an average value of the response delay time of each reactive power equipment in a plurality of voltage disturbance events; dividing the multi-reactive equipment into first-class equipment and second-class equipment according to the average value of the response delay time.
10. The utility model provides a grid voltage control system of many reactive power equipment cooperation which characterized in that includes: the characteristic acquisition module is used for acquiring the response time characteristics of each reactive device; The equipment dividing module is used for dividing the multi-reactive equipment into first equipment and second equipment according to the response time characteristics, wherein the response time of the first equipment is smaller than that of the second equipment; The initial regulation control module is used for preferentially controlling the first-class equipment to execute initial voltage regulation when the power grid voltage deviation is detected; The starting time determining module is used for determining the starting time of the second type of equipment according to the matching degree of the compensation capacity of the first type of equipment and the voltage offset; and the supplementary regulation control module is used for controlling the second type equipment to execute supplementary voltage regulation according to the starting time so as to lead the reactive power output of the second type equipment to be staggered with the first type equipment in time.

Description

Multi-reactive-power-equipment-coordinated power grid voltage control method and system Technical Field The invention relates to the technical field of power systems, in particular to a method and a system for controlling power grid voltage by cooperation of multiple reactive power devices. Background In the running process of the power grid, accurate voltage regulation is a key link for guaranteeing power supply quality, reducing grid loss and improving system safety. In order to cope with voltage fluctuation, various reactive power regulating devices are configured in a power grid, including a static reactive power generator, a static reactive power compensator, a synchronous regulator, a capacitor bank, an energy storage converter with reactive power regulating capability, a new energy unit and the like. The voltage control method generally integrates various reactive devices into an automatic voltage control system, and uniformly distributes reactive instructions according to a global optimization target. While optimal scheduling of reactive power can be achieved from the system level, the essential differences in the time response scales of the different devices are ignored. Specifically, the electric power electronic equipment represented by a static reactive generator can complete reactive output adjustment within millisecond-level time, is suitable for coping with sudden voltage fluctuation, but has relatively limited adjustment capacity, while the electromechanical equipment represented by a capacitor bank and a synchronous camera has larger adjustment capacity and higher steady-state adjustment precision, but has slower response speed, and often requires hundreds of milliseconds or even seconds from instruction sending to output stabilization. When the voltage is offset, if all the devices are simultaneously put into adjustment, the high-frequency dynamic adjustment of the fast device and the low-frequency response period of the slow device can generate superposition interference, so that not only the expected adjustment effect cannot be realized, but also the system oscillation can be caused, and the waste of adjustment resources and the increase of energy loss are caused. Disclosure of Invention To this end, the object of the invention is: the method and the system for controlling the grid voltage by utilizing the multi-reactive equipment cooperation are provided, the equipment is divided into two types of fast and slow according to response time characteristics, the fast equipment is preferentially utilized for initial adjustment, the starting moment of the slow equipment is dynamically determined according to the matching degree of the compensation capacity of the fast equipment and the voltage offset, and the reactive outputs of the two types of equipment are staggered in time, so that adjustment conflict is eliminated, resource internal consumption is reduced, interference among different response time equipment is reduced, and the stability and the adjustment efficiency of voltage recovery are improved. In order to solve the above technical problems, the present invention provides a method for controlling a grid voltage by using multiple reactive power devices, including: The method comprises the steps of obtaining response time characteristics of reactive power equipment, and dividing the multiple reactive power equipment into first-class equipment and second-class equipment according to the response time characteristics, wherein the response time of the first-class equipment is smaller than that of the second-class equipment; when the voltage deviation of the power grid is detected, the first type of equipment is preferentially controlled to execute initial voltage regulation, and the starting time of the second type of equipment is determined according to the matching degree of the compensation capacity of the first type of equipment and the voltage deviation; And controlling the second type equipment to execute the supplementary voltage regulation according to the starting time, so that the reactive power output of the second type equipment is staggered with the first type equipment in time. The method comprises the steps of obtaining current output power and power adjustable upper limit of each reactive device in the first type of devices, determining residual capacity of each reactive device according to the current output power and the power adjustable upper limit, calculating required compensation amount according to the voltage offset, judging whether the residual capacity of each reactive device in the first type of devices is larger than or equal to the required compensation amount, if so, selecting the reactive device with the minimum residual capacity from the reactive devices with the residual capacity larger than or equal to the required compensation amount as an executing device, executing initial voltage adjustment through the executing device, and if not, sequentially acti