The invention provides an adaptive cascade digital I/O and analog signal collection circuit. The adaptive cascade digital I/O and analog signal collection circuit comprises a digital input circuit, ananalog signal input circuit, an analog power supply, a digital power supply, an ADC reference voltage circuit, a RS-485 interface circuit and a digital signal output circuit. According to the circuit, multiple digital input signals and analog input signals are collected at the same time and transmitted to an MCU module, and digital signals are output through control of the MCU module. The circuitsupports adaptive cascade adjustment, and cascade work of one or more circuits is achieved. During cascade work of the circuits, the circuits communicate through a serial communication interface UARTof the MCU, and the cascade sequence is adaptively identified; a control signal is received and inquired, the collected signal is transmitted to a circuit which is highest in priority and waits for query and control of an upper computer. By means of the technical scheme, the problems are solved that in the prior art, when the digital input signals and the analog input signals are collected, the system complexity is increased, and the number of signal I/O channels cannot be adaptively adjusted.

Adaptive cascade digital I/O and analog signal collection circuit

The invention relates to the technical field of high-voltage direct current transmission valve cooling equipment, and discloses a high-voltage direct current transmission DCS control method. The high-voltage direct current transmission DCS control method comprises the steps that three sets of independent protection unit acquire equipment working data and transmit the working data to a redundant main control unit; the main control unit acquires the working state to perform 'two-out-of-three' protection exit logic judgment and sends a control instruction; and the redundant control unit executes the received instruction. The control method is used for controlling and protecting the closed pure water cooling system of a high-voltage direct current transmission converter valve, provides a reliable guarantee for the safe operation of the converter valve and has high practical value.

High-voltage direct current transmission DCS control method

The invention discloses an instruction control method and device based on a distributed control system. The method is used for creating simulation acquisition nodes for entity nodes in a distributed control system in advance and creating simulation nodes and simulation processing logic for the entity nodes in the distributed control system, and comprises the steps that the simulation acquisition nodes acquire instructions for specified entity nodes in the distributed control system; the simulation acquisition nodes send the instruction to simulation nodes corresponding to the specified entitynode; the simulation processing logic is controlled, and simulation control is carried out by using the simulation nodes and the instruction; whether a processing result of the analog control has an alarm abnormality for an analog node or not is monitored; and if the alarm abnormality does not occur, the instruction is sent to the corresponding entity node, and the specified entity node and the instruction are controlled to perform entity control.

Instruction control method and device based on distributed control system

The invention discloses a DC circuit breaker control method and device. After a first circuit model receives a trip instruction sent by a flexible DC control protection system, the first circuit module determines an instruction type of the trip instruction, and when the instruction is of a protection control type, the first circuit module generates a rapid trig signal and sends the rapid trig signal to a second circuit module; when the instruction is of a manual control type, the first circuit module generates a slow trig signal and sends the slow trip signal to the second circuit module; whenthe second circuit module receives the rapid trip signal, the second circuit module controls a DC circuit breaker to carry out rapid trip through a valve control unit; and when the second circuit module receives the slow trip signal, the second circuit module controls the DC circuit breaker to carry out slow trip through the valve control unit, so that the DC circuit breaker can carry out slow orrapid trip according to corresponding conditions. Under the condition that rapid trigger does not need to be carried out, the method and device can realize slow trip, thereby improving the disconnection success rate of the DC circuit breaker.

DC circuit breaker control method and device

The invention discloses a safety electronic switch. The safety electronic switch comprises a first terminal, a second terminal, a third terminal, surge voltage suppression units, comparators and relays; the surge voltage suppression units are connected with a safety loop through the first terminal; the first terminal is provided with a live line end and a neutral line end; the surge voltage suppression units are connected with the comparators; the comparators are connected with the relays; the relays are connected with the second terminal and the third terminal; the third terminal is connectedwith a low-voltage power supply; and the third terminal is provided with a positive pole and a negative pole which are connected with the low-voltage power supply. According to the safety electronicswitch of the invention, the surge voltage suppression units are adopted, and therefore, the anti-interference ability of an input terminal can be enhanced, and the reliability of operation in a complicated electromagnetic environment can be ensured; a threshold voltage is designed by the comparators, so that the influence of input voltage fluctuation on a circuit can be decreased; a double-channel output structure is adopted, so that a requirement for a functional safety level SIL3 can be met; and the PhotoMOS optocouplers are used, so that a requirement for safe electrical isolation can be met.

Safety electronic switch

The invention provides a two-out-of-three protecting topological structure and method for a converter valve of a flexible DC system. The two-out-of-three protecting topological structure comprises three valve control protection devices and two valve control devices, wherein the three valve control protection devices are a first valve control protection sleeve A, a second valve control protection sleeve B and a third valve control protection sleeve C separately; and the two valve control devices are a first valve control sleeve A and a second valve control sleeve B separately. By adopting the two-out-of-three protecting method, two sets of mutually redundant valve control devices are protected by using three sets of valve control protection devices, and if a protection action is to be output, at least two of the three sets of valve control protection devices A, B and C need to make a protection request at the same time; and according to the protecting structure and method, an existing one-out-of-two protecting method is replaced with a high-reliability two-out-of-three model, so that the calculation and management reliability of converter valve protection is greatly improved.

Two-out-of-three protecting topological structure and method for converter valve of flexible DC system

The invention provides a voltage adaptive multi-channel digital input (DI) board card. Two circuits are specifically provides, one is a wide voltage adaptive DI circuit when applied to active node input, and the other one is a DI circuit powered by a double redundant power supply when applied to inactive node input; the two circuits can realize board card adaptation during wide voltage input while the complexity and cost of input circuit are hardly increased. The board card also has the advantages of stability and reliability of the circuit, and can be widely applied to a control system with digital isolation input requirement.

Voltage adaptive multi-channel digital input board card

The invention provides a power system dynamic simulation experiment platform device. The power system dynamic simulation experiment platform device comprises a valve-based controller, unit simulation and control modules, a digital simulator interface module, a host computer and a real-time digital simulator; the valve-based controller is connected with the unit simulation and control modules, the digital simulator interface module and the real-time digital simulator in turn through a high-speed optical fiber; and the digital simulator interface module is connected with the host computer through an Ethernet. According to the power system dynamic simulation experiment platform device adopted, a plurality of unit simulation and control modules are combined to build the simulation valve tower structure of a power unit so as to simulate the electronic and mechanical features of the unit control board of the power unit and the power unit itself. With the power system dynamic simulation experiment platform device adopted, not only can a conventional power system dynamic simulation experiment be realized, but also the various characteristics of the power unit itself can be also simulated; and various faults of the power unit itself can be simulated; and therefore, deficiencies in responding to and testing unit-level faults in the existing system of an dynamic simulation experiment platform can be eliminated.

Power system dynamic simulation experiment platform

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Two-out-of-three protecting topological structure and method for converter valve of flexible DC system

Voltage adaptive multi-channel digital input board card

Power system dynamic simulation experiment platform