89 results about "Reactive control" patented technology

An automation and motion control system and method to control a plurality of theatrical objects. The control system includes a plurality of nodes and an operator console node in communication with each other over a real time network. The node corresponds to a device for control of a theatrical object. Each node of the plurality of nodes and the operator console node include a microprocessor and a memory device. The operator console node further includes a stored control path submodule, a manual control submodule and a reactive control submodule. Each of the stored control path submodule, the manual control submodule and the reactive control submodule generate an independent control signal. An active control submodule generates a summed control signal in response to the independent control signals from the stored control path submodule, the manual control submodule and the reactive control submodule. The summed control signal is provided to a node process, providing control to at least one device.

The invention relates to a transient synchronous stability evaluation method for a multi-virtual synchronous machine grid-connected system. The method comprises the following steps: constructing a system nonlinear reduced-order mathematical model suitable for transient synchronous stability analysis; considering active and reactive power control dynamic strong coupling and multi-virtual synchronous machine dynamic interaction, and analyzing an energy function of the construction system; respectively calculating a maximum energy value for ensuring system stability and a maximum energy value for ensuring that the system does not trigger current amplitude limiting under the condition that the system does not trigger current amplitude limiting after the fault is removed through a nearest unstable equilibrium point method and an optimization method; taking the minimum value of the two values to obtain a critical energy value for ensuring the transient stability of the system; calculating the track of the system during the fault through numerical integration to obtain the state of the system at the fault removal moment; the state of the system at the fault clearing moment is substituted into an energy function, and an energy function value of the system at the fault clearing moment is calculated; and evaluating the transient synchronization stability of the system.

A downforce control system of a host vehicle includes: at least one module configured to generate a first bias lower bound and a first bias upper bound; a parameter module configured to determine a current understeering angle of the host vehicle; an adaptive bias bounding module configured to generate an understeer and oversteer multiplier based on the current understeering angle; a fusion module configured, based on the first bias lower bound, the first bias upper bound, and the understeer and oversteer multiplier, to generate a second bias lower bound and a second bias upper bound; and a downforce tracking module configured, based on the second bias lower bound and the second bias upper bound, to adjust position of one or more downforce devices of the host vehicle.

The invention discloses a network construction type VSG power grid fault active support cooperative control method, and belongs to the technical field of new energy grid-connected control. According to the method, the power grid voltage is monitored in real time, and a cooperative strategy is dynamically triggered: when the voltage drops below a set value, a cooperative control mechanism is started, including (1) self-adaptive active power adjustment based on a power angle stability margin and dynamic correction of a power instruction value to suppress kinetic energy accumulation of a rotor; (2) voltage tracking type reactive compensation is superposed in a reactive control loop, reactive current is increased in real time according to the drop depth, continuous reactive support is provided, and steady-state overcurrent is restrained; and (3) inputting a virtual resistance inductor, and limiting a transient over-current peak value by suppressing a dq-axis coupling current component. When the voltage is normal, the conventional VSG control mode is maintained. According to the invention, power-reactive power-impedance three-dimensional cooperation is realized, power angle stability, current limitation and voltage support are considered, and the stability and active support capability of the network-forming VSG under the power grid drop fault are significantly improved.

The invention relates to the technical field of network construction type converter control, in particular to a network construction type converter power outer loop dynamic control fault ride-through method and system, and the method comprises the steps: constructing a VSG active-frequency control loop and a VSG reactive-voltage control loop; constructing a VSG control-based network construction type converter control loop on the basis of the control loop; during a fault period, the VSG is converted from an active control priority mode to a reactive control priority mode, the VSG dynamically adjusts an active power instruction value and a reactive power instruction value, the active power of the network-forming converter is reduced, and the reactive power is increased; and dynamically adjusting the active droop coefficient according to the voltage drop degree of the power grid, and recovering the power system after the fault is removed. According to the method, the short-term stability of the system is maintained by reducing the active power instruction value during the fault period, and meanwhile, the active droop coefficient is dynamically adjusted, so that the transient recovery process of the VSG after the fault is removed is optimized, and the fault ride-through capability and the transient stability are improved.

A control system for human-robot collaboration, including: a passive reactive control path implemented through a virtual damping system and configured to generate reactive control signals in response to human-applied interaction inputs; a predictive control path configured to generate predictive control signals based on predicted human performance objective inferred online from measured contact wrenches; and a signal blending component configured to combine the reactive control signals and the predictive control signals, wherein the predictive control signals are bounded in magnitude such that passivity of the reactive control path is preserved and stability of closed-loop human-robot interaction is maintained during collaboration.

The invention discloses a static var generator simulation method, a static var generator simulation device and a medium. The method comprises the following steps: constructing a constant voltage control model, a constant reactive power control model, a fault ride-through control model, an off-network protection model and a mode switching control model; constructing a static var generator simulation model based on the constant voltage control model, the constant reactive power control model, the fault ride-through control model, the off-network protection model and the mode switching control model; on the basis of the static var generator simulation model, reactive current is output to power grid equipment according to the specified voltage or reactive control target and the input control parameters, and the power grid equipment stably operates on the basis of the reactive current.

The present invention belongs to the field of new energy power generation equipment, and in particular relates to a control method, system and storage medium for a doubly-fed wind turbine generator set, which obtains a real-time angular frequency deviation signal of a power grid. When the system frequency deviation is greater than a specified value, the bandwidth of a phase-locked loop is adjusted; and a final rotor d-axis current reference instruction is calculated; a reactive power reference instruction is calculated based on the q-axis current reference instruction, a reactive control link is introduced, and the rotor q-axis current reference instruction is calculated by a reactive controller; based on the new current reference signal, the doubly-fed wind turbine generator set generates a new control signal by an upper-level control loop, so that the doubly-fed wind turbine generator outputs corresponding active power and reactive power, thereby achieving rapid and active support for the power grid frequency; compared with the frequency control method implemented in the existing phase-locked loop, the method has the advantages of not requiring the introduction of a differential operator, fast frequency response, simple control structure, and no need to adjust the phase-locked loop bandwidth to a lower value, while maintaining the accuracy of the phase-locked loop phase angle tracking.

The invention relates to the technical field of intelligent inspection equipment, in particular to a dynamic stable overturn-preventing device for an intelligent inspection robot dog. The technical problems that most of the existing anti-overturning technologies depend on simple sensor detection and reactive control, are lack of predictability and initiative and cannot effectively cope with dynamic changes in a complex environment are solved; according to the technical scheme, the dynamic stable anti-overturning device for the intelligent inspection robot dog comprises a posture detection module, a posture prediction module, a threshold comparison and alarm module, a control instruction sending module and a posture adjustment execution module; compared with the prior art that the anti-overturning technology mostly depends on simple sensor detection and reactive control, is lack of predictability and initiative, and cannot effectively cope with dynamic changes in a complex environment; through real-time detection, prediction and active control, the overturning risk of the intelligent inspection robot dog can be found and dealt with in advance, and the stability and safety of the robot dog in a complex environment are remarkably improved.

The invention provides an operation control method for preventing accidental short-period protection shutdown of a reactor in a power rising and falling process of a sodium-cooled fast reactor, which comprises the following steps: increasing the power to an intermediate range of less than 100cps, and controlling reactivity introduced by continuous lifting of a single compensation rod to be 3pcm-5pcm; increasing the power until the intermediate range is greater than 100cps, and continuously increasing the rod position of the single compensation rod by not more than 10mm; checking whether a P signal is correctly triggered and related interlocking takes effect or not in a power increasing process; in the process of increasing the power by more than 10% Pn, the power increasing rate is controlled, and the power increased each time does not exceed 5% of the current reactor power Px; in the reactor power adjusting process, the adjusting rod is kept in the optimal adjusting area, the compensation rod is lifted in turn when the rod grid balancing operation is carried out, and the rod position of the compensation rod is lifted by 10 mm at most each time. According to the method, the technical problem of how to prevent accidental short-period protection shut-down of the reactor in the power rising and falling process of the sodium-cooled fast reactor is solved through research on a reactor start-stop and power rising and falling method.

The invention provides an energy storage type double-fed phase modifier transient synchronous supporting method and device and a medium, and relates to the technical field of electric power. The method comprises the following steps: when voltage drop and frequency disturbance occur in a power system, determining an adaptive reactive current proportionality coefficient according to a voltage deviation normalized value, a frequency deviation normalized value and a frequency change rate normalized value of a machine end of the energy storage type doubly-fed phase modifier by adopting a control strategy of reactive power priority and active power amplitude limiting by the energy storage type doubly-fed phase modifier; determining a target reactive current according to the adaptive reactive current proportionality coefficient so as to carry out reactive control on the energy storage type double-fed phase modifier; and in combination with the amplitude limiting effect of the virtual inertia control and the adaptive reactive current proportionality coefficient on the active current, obtaining a target active current so as to carry out active control on the energy storage type double-fed phase modifier. According to the invention, when voltage drop and frequency disturbance occur in a power system, the active and reactive output proportion can be dynamically adjusted, and the overall stability of voltage and frequency is improved.

The present invention relates to a method and device for adaptive power optimization control of a low-voltage power distribution area, wherein the method comprises: obtaining the load power of the distribution area, and determining a first active power regulation instruction parameter according to the relationship between the load power of the distribution area and the load power setting value; obtaining the voltage amplitude of the common connection point, and determining a second active power regulation instruction parameter according to the relationship between the voltage amplitude of the common connection point and the voltage limit range of the common connection point; obtaining the power factor of the distribution area, and determining a reactive power regulation instruction parameter according to the relationship between the power factor of the distribution area and the power factor setting value; obtaining an active power regulation given instruction according to the first active power regulation instruction parameter and the second active power regulation instruction parameter; obtaining a reactive power regulation given instruction according to the reactive power regulation instruction parameter; outputting the required active power and reactive power according to the active power regulation given instruction and the reactive power regulation given instruction. The present invention can reduce the problem of heavy overload in low-voltage distribution areas and improve the quality of power supply voltage in low-voltage distribution areas.

The invention discloses a reactive active control system and method for a wind power plant. In the control system, an acquisition device is used for acquiring electricity consumption power of all electricity users connected with a power grid at a plurality of preset time points in a preset time period and acquiring active power output by a plurality of wind driven generators connected with the power grid at the plurality of preset time points in the preset time period; the structuring device is used for obtaining a corresponding electricity utilization input matrix and an active power input matrix based on the electricity utilization power and the active power; the feature processing device is used for obtaining a corresponding power consumption feature map and an active power feature map by using a first convolutional neural network model and a non-local neural network model based on the power consumption input matrix and the active power input matrix; and the calculation device is used for obtaining a difference characteristic pattern based on the power consumption characteristic pattern and the active power characteristic pattern, and inputting the difference characteristic pattern into the decoder for decoding regression to output reactive voltage so as to realize reactive control. According to the control system, the grid connection stability of the wind power plant can be improved.

The invention relates to the technical field of industrial automation and motor control, discloses a wide-temperature starting method and system for an industrial internet brushless motor, and aims to solve the problems of starting parameter mismatch, stalling or torque oscillation caused by physical delay of a temperature sensor and a reactive control strategy in the prior art. The method comprises the following steps: collecting thermal state and electric state data of a motor in real time, and constructing a multi-dimensional time sequence characteristic matrix; predicting a future temperature trajectory through an eight-bit integer quantization LSTM model deployed at an edge end; a global thermal environment early warning instruction issued by the cloud is fused, and a corrected temperature track is generated; based on the track, calculating an optimal starting control parameter by using a motor physical parameterization model and executing starting; and after starting is completed, uploading a data log for iteration of the cloud model. According to the application, the starting reliability and the control performance of the brushless motor in a wide temperature range are remarkably improved through an edge cloud collaborative zero-lag temperature prediction and prospective parameter generation mechanism.

The present application relates to the field of microgrid technology, and discloses a reactive power regulation control method for a grid-connected inverter, a grid-connected inverter, and a storage medium, wherein the method includes: obtaining a power factor value, determining a grid-connected reference current, obtaining a grid voltage, and determining the current working area of ​​the grid-connected inverter according to the polarity of the grid voltage and the polarity of the grid-connected reference current; obtaining a DC input voltage, and determining the switching cycle, duty cycle, and high-frequency working sequence of each switch tube in the working area according to the DC input voltage, the grid voltage, and the cycle calculation rule corresponding to the working area; and controlling each switch tube to be turned on at zero voltage in the working area based on its high-frequency working sequence according to the switching cycle, duty cycle, and high-frequency working sequence of each switch tube in the working area. The method of the present application is adopted to realize the zero-voltage turning on of the switch tube when the grid-connected inverter is subjected to reactive power regulation, and effectively reduce the loss caused by the turning on of the switch tube.

To plan a protection control plan at a low operation cost while satisfying a dynamic constraint condition on reliability in a device for planning the protection control plan by combining preventive control and post-control.SOLUTION: A protection control plan planning device according to the present invention includes a predicted state generation section that generates a future predicted state of a power system, a first protection control plan planning section that plans a first protection control plan of the power system that satisfies a constraint condition related to control of the power system in the predicted state of the power system, a second protection control plan planning section that can plan a second protection control plan of the power system that satisfies the constraint condition when an assumed accident occurs in the predicted state of the power system, and a planning plan change section that creates predetermined information related to the constraint condition for changing a plan content of at least one of the first protection control plan and the second protection control plan when the second protection control plan planning section cannot plan the second protection control plan that satisfies the constraint condition.SELECTED DRAWING: Figure 1

Methods and systems for controlling one or more pumps of a heart-lung-machine. An illustrative method may comprise receiving an actual flow rate of a pump, determining the actual flow rate is from a primary pump, determining an available amount of the actual flow rate of the primary pump that is available to one or more subordinate pumps, comparing the available amount of the actual flow rate of the primary pump to a sum of set flow rates of the one or more subordinate pumps, and operating the one or more subordinate pumps in a proactive control mode or a reactive control mode.

The application provides a static SVG device suitable for heavy load of a locomotive, relates to the field of railway power supply, and comprises a three-phase MMC converter, the three-phase MMC converter comprises three-phase bridge arms, each phase bridge arm is composed of an upper bridge arm and a lower bridge arm, the upper bridge arm comprises a plurality of cascaded half-bridge sub-modules, and the lower bridge arm comprises a plurality of cascaded half-bridge sub-modules, wherein the energy storage elements of the half-bridge sub-modules at least comprise super capacitors; further comprising: a voltage balancing module, which is used for determining the number of real-time input half-bridge sub-modules of the upper bridge arm and the lower bridge arm of each phase bridge arm, and determining the real-time input half-bridge sub-modules of the upper bridge arm and the lower bridge arm of each phase bridge arm based on the number of real-time input half-bridge sub-modules of the upper bridge arm and the lower bridge arm of each phase bridge arm; a network-forming voltage source control module, which is used for active control, reactive control and virtual impedance control, has the advantages of adapting to heavy load of a locomotive and improving the stability of power system operation.

The present invention discloses a horizontal core reactivity control device and a horizontal reactor including the horizontal core reactivity control device. The horizontal core reactivity control device includes a control rod and a driving mechanism. The driving assembly is used for linear stepping motion. The driven assembly includes a driven block, a rotating driving head, and a driving sleeve. The driven block is connected to the output end of the driving assembly. One end of the rotating driving head is rotatably connected to the driven block, and the other end is fixedly connected to the control rod. An external thread is provided on the outer surface of the rotating driving head, and an internal thread matching the external thread of the rotating driving head is provided on the inner surface of the driving sleeve. The driving assembly drives the driven block to perform linear stepping motion, so that the rotating driving head drives the control rod to perform linear stepping motion and rotational motion in the driving sleeve at the same time. In the horizontal core reactivity control device, the control rod has a small deflection during use, which can effectively ensure its insertability in the control rod channel.

The present application proposes a ball-dropping device for a ball-bed type high-temperature gas-cooled reactor absorption ball shutdown system, comprising a ball storage tank, a ball-dropping tube, a driving device, a limiting device, an absorption ball driving mechanism controller and an absorption ball shutdown system driver, wherein the upper part of the ball-dropping tube is inserted into the ball storage tank through the ball-dropping port at the bottom of the ball storage tank, the driving plate on the ball-dropping tube is respectively connected to the driving device and the limiting device, the driving motor in the driving device drives the ball-dropping tube to move up and down by rotation, and the limiting device provides guidance for the displacement of the ball-dropping tube; the absorption ball driving mechanism controller is used to collect the material level signal of the ball storage tank in the ball storage tank, the limiting signal of the limiting device and the rotation signal of the driving device, and provide instructions to the host computer through the logic processor; the absorption ball shutdown system driver is used to receive the control signal of the absorption ball driving mechanism controller and control the rotation of the driving motor. The present application realizes quantitative delivery of absorption balls and increases the diversity of reactivity control of high-temperature gas-cooled reactors.

The present invention proposes a method for dynamic partitioning of active distribution network based on reactive power flow tracking and branch cutting. First, the VVS of each reactive source node to the remaining nodes is calculated by adding voltage reactive output perturbation to the reactive source; secondly, the VVS is fuzzified to obtain the membership matrix between the nodes, and the power source nodes are pre-partitioned according to the membership relationship between the reactive source nodes, and the dominant nodes and the number of partitions are preliminarily determined; then, the branch range to be cut is determined based on the node power flow direction and the voltage reactive power partitioning principle; the optimal branch cutting point is found with the regional comprehensive coupling degree as the objective function of BPSO, and the partitioning result is determined; finally, the partitioning result is subjected to reactive reserve verification to obtain the final partitioning result. The VVS index proposed by the present invention changes dynamically with the changes in DG output and load, and the proposed "reactive source node pre-partitioning - load node mapping partitioning" idea ensures the effectiveness of regional voltage reactive power control.

The invention provides a coastal cargo ship power system and a control method, the coastal cargo ship power system comprises a power source module, an energy distribution and conversion module, an information perception and fusion module and an intelligent control module, and the core of the method is that a future planned route and meteorological sea condition information of a ship are obtained; carrying out predictive identification on the future navigation working condition based on the information by utilizing an intelligent control unit; the invention relates to the technical field of ship power, and in particular relates to a method for dynamically generating an optimal power distribution instruction for a main diesel generating set and a lithium ion battery energy storage system by adopting a predictive energy management algorithm, which comprises the following steps of: performing predictive identification on a navigation working condition by acquiring future route and sea condition information of a ship; and then a predictive energy management algorithm of an equivalent fuel consumption minimum strategy is adopted to dynamically generate an optimal power distribution instruction for the diesel engine and the lithium battery, so that the spanning from reactive control to predictive management is realized, and the fuel consumption and emission of the ship can be remarkably reduced.

The invention provides static SVG equipment suitable for heavy load locomotive load, and relates to the field of railway power supply, the static SVG equipment comprises a three-phase MMC converter, the three-phase MMC converter comprises three phases of bridge arms, each phase of bridge arm is composed of an upper bridge arm and a lower bridge arm, the upper bridge arm comprises a plurality of cascaded half-bridge sub-models, and the lower bridge arm comprises a plurality of cascaded half-bridge sub-modules, the energy storage element of the half-bridge sub-module at least comprises a super capacitor; the voltage balancing module is used for determining the number of the half-bridge sub-modules which are put into the upper bridge arm and the lower bridge arm of each phase of bridge arm in real time, and determining the half-bridge sub-modules which are put into the upper bridge arm and the lower bridge arm of each phase of bridge arm in real time based on the number of the half-bridge sub-modules which are put into the upper bridge arm and the lower bridge arm of each phase of bridge arm in real time; and the network construction type voltage source control module is used for performing active control, reactive control and virtual impedance control, and has the advantages of adapting to heavy-load locomotive load and improving the operation stability of a power system.

The invention belongs to the technical field of vehicle power supply management, and relates to a special vehicle vibration adaptive power supply voltage stabilization method and a chopping control system, and the method comprises the following steps: generating an original vibration voltage signal corresponding to the vibration intensity; filtering and amplifying the original vibration voltage signal to generate a vibration feedforward signal; multiplying the vibration feed-forward signal by a preset compensation coefficient, and adding the product with a preset static reference voltage value to generate a dynamic reference voltage; collecting and conditioning the signal in real time to generate an actual output voltage value reflecting the current electrical output state; scaling the amplitude of the error voltage signal according to a preset safety threshold to generate a regulation error signal; a pulse control sequence is generated through a switch driving circuit so as to modulate the conduction duty ratio of a switch transistor in the chopping module, adjust the operation state of a chopping switch and output self-adaptive stable voltage. According to the invention, the problem that the response speed is often insufficient due to inherent sensing, calculation and execution delay of reactive control is solved.

The invention discloses a power oscillation suppression method for a grid-forming type energy storage converter parallel system, and belongs to the field of micro-grid power utilization. Acquiring a three-phase output voltage and a three-phase current; calculating instantaneous active power and reactive power by using the three-phase voltage and the three-phase current, and constructing an active power control loop and a reactive power control loop; calculating an active damping compensation amount; angular frequency required by the system and a system phase damping an oscillation component in the active power are calculated; calculating a reactive power damping compensation amount; calculating a reference voltage amplitude required by the system and damping an oscillation component in reactive power; a three-phase voltage, a three-phase current, a system phase damping an oscillation component in active power and a reference voltage amplitude damping an oscillation component in reactive power are sent to a voltage control loop and a current control loop to generate a modulation signal and convert the modulation signal into a control signal, and the control signal acts on a converter so as to suppress oscillation. Damping compensation branches are designed from an active control loop and a reactive control loop, system damping is greatly increased, and the interactive oscillation phenomenon of the grid-forming type energy storage converter parallel system can be effectively restrained.

The invention discloses a control rod design method and device and a design method of an air-cooled micro reactor, and the control rod design method comprises the following steps: determining an arrangement space and a control rod material of a control rod according to a reactor core geometric structure, temperature distribution and material compatibility data of the micro reactor; determining physical parameters of a control rod according to the shutdown margin limiting condition, the residual reactivity, the temperature reactivity and the iodine pit depth of the micro reactor; determining an adjusting band range of the control rod according to the rod bouncing accident safety constraint condition and the power adjusting requirement; and arranging the control rod in the arrangement space according to the physical parameters of the control rod and the adjustment band range. By adopting the method, the reactivity control capability of the control rod can be improved under the condition of ensuring the compactness of the reactor core.

The invention discloses an active tracking and covering method based on a channel knowledge map in a mobile antenna system, which aims to maximize the total spectrum efficiency in a service period by expressing an active tracking and covering task of mobile user equipment as a long-term trajectory optimization problem of a mobile antenna. Accurately modeling a dependency relationship of a channel on each surface freedom degree of the antenna by using a control parameter obtained based on a Rodrigues rotation matrix; key physical feasibility constraint conditions are systematically integrated, so that the feasibility of an optimization result in engineering is ensured; a channel knowledge map is introduced to realize proactive planning, and traditional reactive control is converted into active planning by utilizing prediction information, so that performance loss caused by channel information lag is reduced; on the basis of a manifold optimization framework, rotation parameters of the movable antenna system are mapped to a special orthogonal group manifold for optimization, rotation constraints are processed through Lie group operation, and singularity and calculation redundancy caused by traditional parameterization are avoided.

The present invention discloses a reactivity control cylinder and a control method for a nuclear reactor, belonging to the technical field of nuclear reactor reactivity control. The reactivity control cylinder for the nuclear reactor includes a first fixed reflector disposed around the core and a plurality of cylinders. The core has a longitudinal central axis. The plurality of cylinders are coaxially sleeved between the core and the first fixed reflector in sequence from inside to outside with the longitudinal central axis as the center. A rotary driver is connected to each cylinder, and the same number of absorber layers are uniformly spaced along the circumference of each cylinder. The reactivity control cylinder and the control method of the present invention can ensure that the absorption / reflection effect is uniform for the fuel consumption in all radial directions in the reactor core during long-term operation. At the same time, without increasing the total mass and volume of the absorber layer, and on the premise of maintaining neutron economy or utilization rate, the purpose of increasing the controllable reactivity range of the cylinder is achieved.

An automation and motion control system and method to control a plurality of theatrical objects. The control system includes a plurality of nodes and an operator console node in communication with each other over a real time network. The node corresponds to a device for control of a theatrical object. Each node of the plurality of nodes and the operator console node include a microprocessor and a memory device. The operator console node further includes a stored control path submodule, a manual control submodule and a reactive control submodule. Each of the stored control path submodule, the manual control submodule and the reactive control submodule generate an independent control signal. An active control submodule generates a summed control signal in response to the independent control signals from the stored control path submodule, the manual control submodule and the reactive control submodule. The summed control signal is provided to a node process, providing control to at least one device.

Apparatus and methods are provided herein. In certain embodiments, a reactance control apparatus for a showerhead in a processing chamber includes a bottom edge disposed to contact at least a portion of a top surface of the showerhead. The reactance control device may include a body surface having an inner connection edge and an outer periphery connected to the bottom edge via a sidewall, the inner connection edge having a smaller diameter than the outer periphery of the body surface, where the inner connection edge defines a bore configured to receive a portion of a shaft of the showerhead, and where the bore is configured to receive a portion of the shaft of the showerhead. And the inner connecting edge is further configured to engage with a mounting device disposed near the shaft portion of the showerhead in order to secure the reactance control device to the showerhead.