It is desirable to improve the accuracy of voltage control in the grid interconnection device for supplying the power generated by the distributed power source to the interconnection point. Provided is a grid interconnection device for supplying power generated by a distributed power source to an interconnection point, comprising: a calculation unit for calculating voltage at the interconnection point based on output voltage of the grid interconnection device, output current of the grid interconnection device, and an impedance component between the grid interconnection device and the interconnection point; and a control unit for controlling output power from the grid interconnection device, based on voltage at the interconnection point calculated by the calculation unit.

A power apparatus applied in an SST structure includes a first AC-to-DC conversion unit, a first DC bus, an isolated transformer, a DC-to-AC conversion unit, a second AC-to-DC conversion unit, and a second DC bus. The first AC-to-DC conversion unit has a first bridge arm and a second bridge arm. The first DC bus provides a first DC voltage. The isolated transformer has a primary side and a secondary side. The DC-to-AC conversion unit has a third bridge arm and a fourth bridge arm. The second AC-to-DC conversion unit has a fifth bridge arm and a sixth bridge arm. The second DC bus provides a second DC voltage.

A resonance control method for differentiated phase correction under asymmetric positive and negative bilateral frequency domains includes a differentiated phase correction resonance control link with an independent phase correction angle at each resonance point, a decoupling link and a delay compensation link. As a high power converter has the characteristic of asymmetric positive and negative bilateral frequency domains under resonance control with decoupling, stability margin of a control link is enhanced while a negative-sequence current suppression capability is realized by means of differentiated phase correction at positive and negative resonance poles.

A compensation signal generator generates a compensation signal for canceling an electromagnetic noise on a connection line on the basis of a detection signal of a noise detector. A compensation signal injector injects the compensation signal into the connection line. A compensation signal detector outputs a detection signal of the compensation signal. A low-frequency component subtraction unit amplifies a component in a predetermined first frequency region of the detection signal and negatively feeds back the amplified component to the compensation signal generator. An intermediate frequency component addition unit positively feeds back a component of a predetermined second frequency that is higher than the first frequency region in the detection signal to the compensation signal generator.

A power conversion device includes a power conversion module, a phase change material, a heat dissipation member, a cooling mechanism, and a controller. A semiconductor switching element and a freewheeling diode configure a power conversion circuit. The phase change material is provided on a principal plane of a casing. The heat dissipation member includes a heat dissipation surface. The heat dissipation surface is overlapped with the principal plane to sandwich the phase change material. The cooling mechanism cools the heat dissipation member. The controller generates a driving signal for driving the power conversion circuit and controls the cooling mechanism. The controller includes a predetermined heating operation. The heating operation may drive the power conversion circuit, in a state that the cooling mechanism is stopped or intermittently operated, such that heat generation occurs in both the semiconductor switching element and the freewheeling diode.

A power converter includes a heat generator configured to generate heat through power conversion, and a case housing the heat generator. The case includes a case member that is made of resin and defines an opening, and a cooler that is made of metal and disposed to cover the opening. The cooler includes a cooling water passage for cooling the heat generator. The case member includes an upper case member that defines an upper opening to be covered by a cover member, and a lower case member that defines the opening covered by the cooler. One of the upper case member and the lower case member has an input side attachment portion to be attached to an input terminal and the other of the upper case member and the lower case member has an output side attachment portion to be attached to an output terminal.

A power conversion device include a switch for switching so as to output by selecting one of a command value the first DC voltage controller outputs or holds or the command value the second DC voltage controller outputs, a detector that detects the opening of the contactor and the recovery from voltage disturbance in the system on the AC side of the power conversion circuit, and a switching controller controls the switching of the switch so that selects and outputs the command value output by the second DC voltage controller when the detector detects the opening of the contactor, and selects and outputs the command value held by the first DC voltage controller when the detector detects the recovery from the voltage disturbance.

A power conversion device include a switch for switching so as to output by selecting one of a command value the first DC voltage controller outputs or holds or the command value the second DC voltage controller outputs, a detector that detects the opening of the contactor and the recovery from voltage disturbance in the system on the AC side of the power conversion circuit, and a switching controller controls the switching of the switch so that selects and outputs the command value output by the second DC voltage controller when the detector detects the opening of the contactor, and selects and outputs the command value held by the first DC voltage controller when the detector detects the recovery from the voltage disturbance.

A control apparatus is provided for controlling drive of a rotating electric machine that has coils of two or more phases. The control apparatus includes a first inverter to be connected with first ends of the coils, a second inverter to be connected with second ends of the coils, and a controller. The first inverter has a plurality of first switching elements each corresponding to one of the coils. The second inverter has a plurality of second switching elements each corresponding to one of the coils. The controller includes a first operation circuit configured to generate a first control signal for control of the first inverter and a second operation circuit configured to generate a second control signal for control of the second inverter. Moreover, the control apparatus is configured so that switching timings are synchronized, based on synchronization information, between the first and second inverters.

A sealing structure includes: a case that stores an in-vehicle electronic component and has an opening; and a first cover member that covers the opening of the case. The case includes: an protrusion member that has a sealing surface protruded to surround the opening; and a rib that is protruded on an opposite side of the opening with the protrusion member interposed therebetween. The rib has a discharge surface that is connected to the sealing surface of the protrusion member. The first cover member has an extension member that extends along the rib. The discharge surface of the rib is located to be lower than the sealing surface of the protrusion member while the case is arranged with the opening facing upward, and the extension member of the first cover member extends to be lower than the discharge surface of the rib.